In this paper, fading models are considered. Fading is deviation of the attenuation of signal affecting certain parameters and various components. In this paper, I represent the disadvantages of fading. Fading can cause poor performance in a communication system because it can result in a loss of signal power without reducing the power of the noise. This signal loss can be over all of the signal bandwidth. Furthermore this review paper also describes its appropriate solution OFDM that will reduce fading in some extent. Prof. Sukhjinder Singh | Dr. Hitanshu Kumar | Sarita Devi | Dr. Arashdeep Singh "Fading Techniques in Wireless Communication and their Appropriate Solution- A Review" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-6 | Issue-7 , December 2022, URL: https://www.ijtsrd.com/papers/ijtsrd52381.pdf Paper URL: https://www.ijtsrd.com/engineering/electronics-and-communication-engineering/52381/fading-techniques-in-wireless-communication-and-their-appropriate-solution-a-review/prof-sukhjinder-singh
Hello everyone. This is a short presentation on path loss and shadowing. I have not covered all the topics but a brief idea is given on path loss and wireless channel propagation models.
Hope you find it useful.
Thanks
Transmission system used for optical fibers Jay Baria
In this presentation I have explained various types of transmission system used for optical transmission and also described about the budget method that has to be followed while selecting an source for optical fibers and also about the factors that should be consider while selecting an source.
Hello everyone. This is a short presentation on path loss and shadowing. I have not covered all the topics but a brief idea is given on path loss and wireless channel propagation models.
Hope you find it useful.
Thanks
Transmission system used for optical fibers Jay Baria
In this presentation I have explained various types of transmission system used for optical transmission and also described about the budget method that has to be followed while selecting an source for optical fibers and also about the factors that should be consider while selecting an source.
Loss of strength, A periodic reduction in the received strength of a radio transmission.
This is about the phenomenon of loss of signal in telecommunications.Fading refers to the
time variation of the received signal power caused by changes in the transmission medium or path.
In digital modulation, minimum-shift keying(MSK) is a type of continuous-phase frequency-shift keying that was developed in the late 1950s and 1960s.
Similar to OQPSK(Offset quadrature phase-shift keying),
UNIT I
WIRELESS COMMUNICATION
Cellular systems- Frequency Management and Channel Assignment- types of handoff and their characteristics, dropped call rates & their evaluation -MAC – SDMA – FDMA –TDMA – CDMA – Cellular Wireless Networks
This narrated power point presentation attempts to explain the various dispersion mechanisms that are observed in optical fibers. Some fundamental terms and concepts are also discussed. The material will be useful for KTU final year B Tech students who prepare for the subject EC 405, Optical Communications.
Bit Error Rate Assessment of Digital Modulation Schemes on Additive White Gau...inventionjournals
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
Loss of strength, A periodic reduction in the received strength of a radio transmission.
This is about the phenomenon of loss of signal in telecommunications.Fading refers to the
time variation of the received signal power caused by changes in the transmission medium or path.
In digital modulation, minimum-shift keying(MSK) is a type of continuous-phase frequency-shift keying that was developed in the late 1950s and 1960s.
Similar to OQPSK(Offset quadrature phase-shift keying),
UNIT I
WIRELESS COMMUNICATION
Cellular systems- Frequency Management and Channel Assignment- types of handoff and their characteristics, dropped call rates & their evaluation -MAC – SDMA – FDMA –TDMA – CDMA – Cellular Wireless Networks
This narrated power point presentation attempts to explain the various dispersion mechanisms that are observed in optical fibers. Some fundamental terms and concepts are also discussed. The material will be useful for KTU final year B Tech students who prepare for the subject EC 405, Optical Communications.
Bit Error Rate Assessment of Digital Modulation Schemes on Additive White Gau...inventionjournals
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
COMPARISON OF BER AND NUMBER OF ERRORS WITH DIFFERENT MODULATION TECHNIQUES I...Sukhvinder Singh Malik
This paper provides analysis of BER and Number of Errors for MIMO-OFDM wireless communication system by using different modulation techniques. Wireless designers constantly seek to improve the spectrum efficiency/capacity, coverage of wireless networks, and link reliability. So the performances of the wireless communication systems can be enhanced by using multiple transmit and receive antennas, which is generally referred to as the MIMO technique. Here analysis will be carried out for an OFDM wireless communication system using different modulation techniques and considering the effect and the wireless channel like AWGN, fading. Performance results will be evaluated numerically and graphically using the plots of BER versus SNR and plots of number of errors versus SNR.
compare large and small scale fadingSolutionSmall Scale Fading.pdfarchanadesignfashion
compare large and small scale fading
Solution
Small Scale Fading- It is state that the rapid fluctuation of Received Signal strength over very
Short distance and short time is concerned as Small Scale Fading.It is a characteristic of Radio
propagation resulting from the presence of reflectors and scatterers that cause multiple versions
of the Transmitted signal to arrive at the receiver, each distorted in amplitude, phase and angle of
arrival.
Large Scale Fading- The Large Scale fading is related to Large Fluctuation. It is the result of
signal attenuation due to signal propagation over large distances and duffraction around large
objects in the propagation path.
The three most important effects:-
1) Rapid changess in signal strength over a small travel distance or time interval.
2) Random frequency modulation due to varying Doppler shifts on different multipath signals.
3) Time dispersion caused by multipath propagation delay.
Factors affecting Small Scale Fading:-
a) Multiplepath propagation- Reflection Objects and scatterers.
b) Speed of the mobile- Doppler Shifts
c) Transmission bandwidth of the signal
d) The received signal will; be distorted if the transmission bandwidth is greater than the
bandwidth of the multipath channel.
e) Coherent Bandwidth- Bandwidth of the multiple Channel.
Cause of Large Scale Fading:-
a) Large scale fading is due to the shadowing effect of large size objects.
b) It is the main signal strength vs large distance between transmitter and receiver.
c) Power Loss and Power Gain:- The ratio of total transmitted power over the received power
and the path gain is 1 per path loss.
Types of Small Scale Fading:-
Small Scale Fading (Based on Multipath Time Delay Spread)
*Flat Fading:- Bandwidth signal is smaller than bandwidth of channel.
* Delay spread is smaller than symbol period.
Frequency Selective Fading:-
* Bandwidth is greater than Bandwidth of channel.
* Delay Spread is greater than Symbol Period.
Small Scale Fading(Based on Doppler Spread)
Fast Fading:-
* HIgh doppler spread with coherence time is less than symbol period.
* Channel variation is Faster than baseband signal variation
Slow Fading:-
* It has low doppler Spread with coherence time is greater than symbol period.
* Channel variation is smaller than baseband signal variation.
Large Scale Fading:-
* In free space, received power attenuates like 1/r2.
* With reflection and obstructions, can attenuate even more rapidly with distance.
* Time constants associated with variations are very long as mobile moves, many seconds or
minutes.
* More important for cell site planning, less for communication system design..
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Explain in detail how OFDM helps mitigates multipath fading effects..pdfforwardcom41
Explain in detail how OFDM helps mitigates multipath fading effects.
Thank you! As detailed as possible!
Solution
Multipath fading is a feature that needs to be taken into account when designing or developing a
radio communications system. In any terrestrial radio communications system, the signal will
reach the receiver not only via the direct path, but also as a result of reflections from objects such
as buildings, hills, ground, water, etc that are adjacent to the main path.The overall signal at the
radio receiver is a summation of the variety of signals being received. As they all have different
path lengths, the signals will add and subtract from the total dependent upon their relative
phases.
At times there will be changes in the relative path lengths. This could result from either the radio
transmitter or receiver moving, or any of the objects that provides a reflective surface moving.
This will result in the phases of the signals arriving at the receiver changing, and in turn this will
result in the signal strength varying as a result of the different way in which the signals will sum
together. It is this that causes the fading that is present on many signals.
Multipath fading can affect radio communications channels in two main ways. This can give the
way in which the effects of the multipath fading are mitigated..
Explain in detail how OFDM helps mitigates multipath fading effects..pdfwasemanivytreenrco51
Explain in detail how OFDM helps mitigates multipath fading effects.
Thank you! As detailed as possible!
Solution
Multipath fading is a feature that needs to be taken into account when designing or developing a
radio communications system. In any terrestrial radio communications system, the signal will
reach the receiver not only via the direct path, but also as a result of reflections from objects such
as buildings, hills, ground, water, etc that are adjacent to the main path.The overall signal at the
radio receiver is a summation of the variety of signals being received. As they all have different
path lengths, the signals will add and subtract from the total dependent upon their relative
phases.
At times there will be changes in the relative path lengths. This could result from either the radio
transmitter or receiver moving, or any of the objects that provides a reflective surface moving.
This will result in the phases of the signals arriving at the receiver changing, and in turn this will
result in the signal strength varying as a result of the different way in which the signals will sum
together. It is this that causes the fading that is present on many signals.
Multipath fading can affect radio communications channels in two main ways. This can give the
way in which the effects of the multipath fading are mitigated..
Similar to Fading Techniques in Wireless Communication and their Appropriate Solution A Review (20)
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Assess Perspective and Knowledge of Healthcare Providers Towards Elehealth in...ijtsrd
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Energy becomes sustainable if it meets the needs of the present without compromising the ability of future generations to meet their own needs. Some of the definitions of sustainable energy include the considerations of environmental aspects such as greenhouse gas emissions, social, and economic aspects such as energy poverty. Generally far more sustainable than fossil fuel are renewable energy sources such as wind, hydroelectric power, solar, and geothermal energy sources. Worthy of note is that some renewable energy projects, like the clearing of forests to produce biofuels, can cause severe environmental damage. The sustainability of nuclear power which is a low carbon source is highly debated because of concerns about radioactive waste, nuclear proliferation, and accidents. The switching from coal to natural gas has environmental benefits, including a lower climate impact, but could lead to delay in switching to more sustainable options. “Carbon capture and storage” can be built into power plants to remove the carbon dioxide CO2 emissions, but this technology is expensive and has rarely been implemented. Leading non renewable energy sources around the world is fossil fuels, coal, petroleum, and natural gas. Nuclear energy is usually considered another non renewable energy source, although nuclear energy itself is a renewable energy source, but the material used in nuclear power plants is not. The paper addresses the issue of sustainable energy, its attendant benefits to the future generation, and humanity in general. Paul A. Adekunte | Matthew N. O. Sadiku | Janet O. Sadiku "Sustainable Energy" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-8 | Issue-1 , February 2024, URL: https://www.ijtsrd.com/papers/ijtsrd64534.pdf Paper Url: https://www.ijtsrd.com/engineering/electrical-engineering/64534/sustainable-energy/paul-a-adekunte
Concepts for Sudan Survey Act Implementations Executive Regulations and Stand...ijtsrd
This paper aims to outline the executive regulations, survey standards, and specifications required for the implementation of the Sudan Survey Act, and for regulating and organizing all surveying work activities in Sudan. The act has been discussed for more than 5 years. The Land Survey Act was initiated by the Sudan Survey Authority and all official legislations were headed by the Sudan Ministry of Justice till it was issued in 2022. The paper presents conceptual guidelines to be used for the Survey Act implementation and to regulate the survey work practice, standardizing the field surveys, processing, quality control, procedures, and the processes related to survey work carried out by the stakeholders and relevant authorities in Sudan. The conceptual guidelines are meant to improve the quality and harmonization of geospatial data and to aid decision making processes as well as geospatial information systems. The established comprehensive executive regulations will govern and regulate the implementation of the Sudan Survey Geomatics Act in all surveying and mapping practices undertaken by the Sudan Survey Authority SSA and state local survey departments for public or private sector organizations. The targeted standards and specifications include the reference frame, projection, coordinate systems, and the guidelines and specifications that must be followed in the field of survey work, processes, and mapping products. In the last few decades, there has been a growing awareness of the importance of geomatics activities and measurements on the Earths surface in space and time, together with observing and mapping the changes. In such cases, data must be captured promptly, standardized, and obtained with more accuracy and specified in much detail. The paper will also highlight the current situation in Sudan, the degree to which survey standards are used, the problems encountered, and the errors that arise from not using the standards and survey specifications. Kamal A. A. Sami "Concepts for Sudan Survey Act Implementations - Executive Regulations and Standards" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-8 | Issue-1 , February 2024, URL: https://www.ijtsrd.com/papers/ijtsrd63484.pdf Paper Url: https://www.ijtsrd.com/engineering/civil-engineering/63484/concepts-for-sudan-survey-act-implementations--executive-regulations-and-standards/kamal-a-a-sami
Towards the Implementation of the Sudan Interpolated Geoid Model Khartoum Sta...ijtsrd
The discussions between ellipsoid and geoid have invoked many researchers during the recent decades, especially during the GNSS technology era, which had witnessed a great deal of development but still geoid undulation requires more investigations. To figure out a solution for Sudans local geoid, this research has tried to intake the possibility of determining the geoid model by following two approaches, gravimetric and geometrical geoid model determination, by making use of GNSS leveling benchmarks at Khartoum state. The Benchmarks are well distributed in the study area, in which, the horizontal coordinates and the height above the ellipsoid have been observed by GNSS while orthometric heights were carried out using precise leveling. The Global Geopotential Model GGM represented in EGM2008 has been exploited to figure out the geoid undulation at the benchmarks in the study area. This is followed by a fitting process, that has been done to suit the geoid undulation data which has been computed using GNSS leveling data and geoid undulation inspired by the EGM2008. Two geoid surfaces were created after the fitting process to ensure that they are identical and both of them could be counted for getting the same geoid undulation with an acceptable accuracy. In this respect, statistical operation played an important role in ensuring the consistency and integrity of the model by applying cross validation techniques splitting the data into training and testing datasets for building the geoid model and testing its eligibility. The geometrical solution for geoid undulation computation has been utilized by applying straightforward equations that facilitate the calculation of the geoid undulation directly through applying statistical techniques for the GNSS leveling data of the study area to get the common equation parameters values that could be utilized to calculate geoid undulation of any position in the study area within the claimed accuracy. Both systems were checked and proved eligible to be used within the study area with acceptable accuracy which may contribute to solving the geoid undulation problem in the Khartoum area, and be further generalized to determine the geoid model over the entire country, and this could be considered in the future, for regional and continental geoid model. Ahmed M. A. Mohammed. | Kamal A. A. Sami "Towards the Implementation of the Sudan Interpolated Geoid Model (Khartoum State Case Study)" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-8 | Issue-1 , February 2024, URL: https://www.ijtsrd.com/papers/ijtsrd63483.pdf Paper Url: https://www.ijtsrd.com/engineering/civil-engineering/63483/towards-the-implementation-of-the-sudan-interpolated-geoid-model-khartoum-state-case-study/ahmed-m-a-mohammed
Activating Geospatial Information for Sudans Sustainable Investment Mapijtsrd
Sudan is witnessing an acceleration in the processes of development and transformation in the performance of government institutions to raise the productivity and investment efficiency of the government sector. The development plans and investment opportunities have focused on achieving national goals in various sectors. This paper aims to illuminate the path to the future and provide geospatial data and information to develop the investment climate and environment for all sized businesses, and to bridge the development gap between the Sudan states. The Sudan Survey Authority SSA is the main advisor to the Sudan Government in conducting surveying, mappings, designing, and developing systems related to geospatial data and information. In recent years, SSA made a strategic partnership with the Ministry of Investment to activate Geospatial Information for Sudans Sustainable Investment and in particular, for the preparation and implementation of the Sudan investment map, based on the directives and objectives of the Ministry of Investment MI in Sudan. This paper comes within the framework of activating the efforts of the Ministry of Investment to develop technical investment services by applying techniques adopted by the Ministry and its strategic partners for advancing investment processes in the country. Kamal A. A. Sami "Activating Geospatial Information for Sudan's Sustainable Investment Map" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-8 | Issue-1 , February 2024, URL: https://www.ijtsrd.com/papers/ijtsrd63482.pdf Paper Url: https://www.ijtsrd.com/engineering/information-technology/63482/activating-geospatial-information-for-sudans-sustainable-investment-map/kamal-a-a-sami
Educational Unity Embracing Diversity for a Stronger Societyijtsrd
In a rapidly changing global landscape, the importance of education as a unifying force cannot be overstated. This paper explores the crucial role of educational unity in fostering a stronger and more inclusive society through the embrace of diversity. By examining the benefits of diverse learning environments, the paper aims to highlight the positive impact on societal strength. The discussion encompasses various dimensions, from curriculum design to classroom dynamics, and emphasizes the need for educational institutions to become catalysts for unity in diversity. It highlights the need for a paradigm shift in educational policies, curricula, and pedagogical approaches to ensure that they are reflective of the diverse fabric of society. This paper also addresses the challenges associated with implementing inclusive educational practices and offers practical strategies for overcoming barriers. It advocates for collaborative efforts between educational institutions, policymakers, and communities to create a supportive ecosystem that promotes diversity and unity. Mr. Amit Adhikari | Madhumita Teli | Gopal Adhikari "Educational Unity: Embracing Diversity for a Stronger Society" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-8 | Issue-1 , February 2024, URL: https://www.ijtsrd.com/papers/ijtsrd64525.pdf Paper Url: https://www.ijtsrd.com/humanities-and-the-arts/education/64525/educational-unity-embracing-diversity-for-a-stronger-society/mr-amit-adhikari
Integration of Indian Indigenous Knowledge System in Management Prospects and...ijtsrd
The diversity of indigenous knowledge systems in India is vast and can vary significantly between different communities and regions. Preserving and respecting these knowledge systems is crucial for maintaining cultural heritage, promoting sustainable practices, and fostering cross cultural understanding. In this paper, an overview of the prospects and challenges associated with incorporating Indian indigenous knowledge into management is explored. It is found that IIKS helps in management in many areas like sustainable development, tourism, food security, natural resource management, cultural preservation and innovation, etc. However, IIKS integration with management faces some challenges in the form of a lack of documentation, cultural sensitivity, language barriers legal framework, etc. Savita Lathwal "Integration of Indian Indigenous Knowledge System in Management: Prospects and Challenges" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-8 | Issue-1 , February 2024, URL: https://www.ijtsrd.com/papers/ijtsrd63500.pdf Paper Url: https://www.ijtsrd.com/management/accounting-and-finance/63500/integration-of-indian-indigenous-knowledge-system-in-management-prospects-and-challenges/savita-lathwal
DeepMask Transforming Face Mask Identification for Better Pandemic Control in...ijtsrd
The COVID 19 pandemic has highlighted the crucial need of preventive measures, with widespread use of face masks being a key method for slowing the viruss spread. This research investigates face mask identification using deep learning as a technological solution to be reducing the risk of coronavirus transmission. The proposed method uses state of the art convolutional neural networks CNNs and transfer learning to automatically recognize persons who are not wearing masks in a variety of circumstances. We discuss how this strategy improves public health and safety by providing an efficient manner of enforcing mask wearing standards. The report also discusses the obstacles, ethical concerns, and prospective applications of face mask detection systems in the ongoing fight against the pandemic. Dilip Kumar Sharma | Aaditya Yadav "DeepMask: Transforming Face Mask Identification for Better Pandemic Control in the COVID-19 Era" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-8 | Issue-1 , February 2024, URL: https://www.ijtsrd.com/papers/ijtsrd64522.pdf Paper Url: https://www.ijtsrd.com/engineering/electronics-and-communication-engineering/64522/deepmask-transforming-face-mask-identification-for-better-pandemic-control-in-the-covid19-era/dilip-kumar-sharma
Streamlining Data Collection eCRF Design and Machine Learningijtsrd
Efficient and accurate data collection is paramount in clinical trials, and the design of Electronic Case Report Forms eCRFs plays a pivotal role in streamlining this process. This paper explores the integration of machine learning techniques in the design and implementation of eCRFs to enhance data collection efficiency. We delve into the synergies between eCRF design principles and machine learning algorithms, aiming to optimize data quality, reduce errors, and expedite the overall data collection process. The application of machine learning in eCRF design brings forth innovative approaches to data validation, anomaly detection, and real time adaptability. This paper discusses the benefits, challenges, and future prospects of leveraging machine learning in eCRF design for streamlined and advanced data collection in clinical trials. Dhanalakshmi D | Vijaya Lakshmi Kannareddy "Streamlining Data Collection: eCRF Design and Machine Learning" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-8 | Issue-1 , February 2024, URL: https://www.ijtsrd.com/papers/ijtsrd63515.pdf Paper Url: https://www.ijtsrd.com/biological-science/biotechnology/63515/streamlining-data-collection-ecrf-design-and-machine-learning/dhanalakshmi-d
Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
Francesca Gottschalk - How can education support child empowerment.pptxEduSkills OECD
Francesca Gottschalk from the OECD’s Centre for Educational Research and Innovation presents at the Ask an Expert Webinar: How can education support child empowerment?
Acetabularia Information For Class 9 .docxvaibhavrinwa19
Acetabularia acetabulum is a single-celled green alga that in its vegetative state is morphologically differentiated into a basal rhizoid and an axially elongated stalk, which bears whorls of branching hairs. The single diploid nucleus resides in the rhizoid.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
Embracing GenAI - A Strategic ImperativePeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
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Low Doppler Spread
Symbol period << Coherence Time
Signal Variation >>Channel Variation
Slow fading results in a loss of SNR Error correction
coding and receiver diversity techniques are used to
overcome effects of slow fading.
Implementation of Fading models or fading
distributions:
Implementations of fading models or fading
distributions include Raleigh fading and Rican fading.
These channel distributions or models are designed to
incorporate fading in the baseband data signal as per
fading profile requirements.
RAYLEIGH FADING:
In relay model, only non-Line of slight (NLOS)
components simulated between transmitter and
receiver.
MATLAB provides “Rayleigh Chan” function to
simulate Rayleigh channel model.
The power is exponentially distributed.
The phase is uniformly distributed and independent
from the amplitude. It is the most used type of fading
in wireless communication.
RICIAN FADING:
In Ra model, both line of sight (LOS) and non-lines
light (NLOS) components are simulated between
transmitter and receiver.
MATLAB provide “Rican Chan” function to simulate
Rican channel model.
FADING MITIGATION TECHNIQUES IN
WIRELESS MOBILE COMMUNICATION
SYSTEM:
INTRODUCTION
In wireless communication, multipath is the
propagation phenomena that results in radio signals
reaching the receiving antenna by two or more paths.
The causes of Considered various channel related
impairments and position of transmitter/receiver
following are the types of fading in wireless
communication system. Large scale fading, small
scale fading and fading models. As we know, fading
signals from ground and surrounding buildings as
well as scattered signals from trees, people and
towers present in the large area. There are two types
of fading viz. large scale fading and slow scale
fading.
LARGE SCALE FADING:
Large scale fading occurs when an obstacle comes in
between transmitter and receiver. This interference
types causes significant amount of signal strength
reduction. This is because EM wave is shadowed or
blocked by the obstacle. It is related to large
fluctuations of the signal over distance.
SMALL SCALE FADING:
Small scale fading is concerned with rapid
fluctuations of received signal strength over very
short distance and short time period. Based on
multipath delay spread there are two types of small
scale fading viz. flat fading and frequency selective
fading. These multipath fading types depend on
propagation environment.
FLAT FADING:
The wireless channel is said to be flat fading if it has
constant gain and linear phase response over a
bandwidth of the transmitted signal.In these types of
fading all the frequency components of received
signal fluctuate in same proportions simultaneously.
It is also known as non-selective fading.
Signal BW<< Channel BW
Symbol period >> Delay spread
The effect of flat fading is seen as decrease in SNR.
This flat fading channel is also known as amplitude
varying channels or narrowband channels.
FREQUENCY SELECTIVE FADING:
It affects different spectral components of a radio
signal with different amplitudes. Hence the name
selective is fading.
Signal BW > Channel BW
Symbol period < Delay Spread
Multipath includes atmospheric scattering, ionosphere
reflection, reflection from water bodies and terrestrial
objects such as mountains and buildings. Multipath
radio signal propagation occurs on all terrestrial radio
links. The radio signals not only travel by the direct
line if sight (LOS) path, but as the transmitted signal
does not leave the transmitted antenna in only the
direction of receiver, but over a range of angles even
when a directive antenna is used. Consequently, the
transmitted signal spread out from transmitter and
they will reach other object: hills, buildings,
reflections surfaces such as the ground, water etc.
When the radio signals arrive at the receiver via
variety of paths, the overall signal received is the sum
of all the signals appearing at the antenna. Sometimes
these signals may be phase with main signal and will
add to it to increase its strength at other times, they
will be out of phase with the main signal, therefore
resulting in overall signal strength reduction.
Background information:
Multipath is the propagation phenomenon that results
in radio signals reaching the receiving antenna bytwo
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or more paths. Fading refers to the distortions that are
carriers modulate telecommunication signal
experiences over certain propagation media.
In wireless system, fading is due to multipath
propagation and is sometime referred to as multipath
include fading. Fading is term used to describe the
fluctuation in a received signal as a result of
multipath component. Several replicas of the signal
arrive at the receiver, having traversed different
propagation paths, adding constructively and
destructively the fading can be defined as fast fading
or slow fading. Additionally, fading can be defined as
flat or frequency Selective fading
MULTIPATH EFFECTIVE FADING:
In principle, the following are the main multipath
effects:
1. Rapid changes in signal strength over a small
travel distance or time interval.
2. Random frequency modulation due to varying
Doppler shifts on different multipath signals.
3. Time dispersion or echoes caused by multipath
propagation delays.
The following physical factors influence small-scale
fading in the radio propagation channel:
1. Multipath propagation – Multipath is the
propagation phenomenon that results in radio
signals reaching the receiving antenna by two or
more paths. The effects of multipath include
constructive and destructive interference, and
phase shifting of the signal.
2. Speed of the mobile – The relative motion
between the base station and the mobile results in
random frequency modulation due to different
doppler shifts on each of the multipath
components.
3. Speed of surrounding objects – If objects in the
radio channel are in motion, they induce a time
varying Doppler shift on multipath components.
If the surrounding objects move at a greater rate
than the mobile, then this effect dominates fading.
4. Transmission Bandwidth of the signal – If the
transmitted radio signal bandwidth is greater than
the “bandwidth” of the multipath channel
(quantified by coherence bandwidth), the received
signal will be distorted.
Orthogonal Frequency Division
Multiplexing:
Orthogonal frequency division multiplexing (OFDM)
is the method of data transmission where a single
information stream is split among several closely
spaced narrowband sub channel frequencies instead of
a signal wideband channel frequency and it is mostly
used in wireless data transmission.
In a traditional single-channel modulation scheme,
each data bit is sent serially or sequentially one after
another. In OFDM, several bits can be sent in parallel,
or at the same time, in separate sub stream channels.
This enables each sub stream’s data rate to be lower
than would be required by a single stream of similar
bandwidth. This makes the system less susceptible to
interference and enables more efficient data
bandwidth.fig1. Show an OFDM spectrum.
Fig. 1OFDM SPECTRUM
OFDM is a form of multicarrier modulation. An
OFDM signal consists of a number of closely spaced
modulated carriers. When modulation of any form –
voice, data, etc. is applied to a carrier, then sidebands
spread out either side. It is necessary for a receiver to
be able to receive the whole signal to be able to
successfully demodulate the data. As a result when
signals are transmitted close to one
Another they must be spaced so that the receiver can
separate them using a filter and there must be a guard
band between them. This is not the case with OFDM.
Although the sidebands from each carrier overlap,
they can still be received without the interference that
might be expected because theyare orthogonal to each
another. This is achieved by having the carrier spacing
equal to the reciprocal of the symbol.
OFDM Signals
DATA ON OFDM:
The data to be transmitted on an OFDM signal is
spread across the carriers of the signal, each carrier
taking part of the payload. This reduces the data rate
has the advantage that interference from reflections is
much less critical.
This is achieved by adding a guard band time or guard
interval into system. This ensure that the data is only
sampled when the signal is stable and no new delayed
signals arrive that would alter the timing and phase of
the signal.
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OFDM guard interval
The distribution of the data across a large number of
carriers in the OFDM signal has some further
advantages. Null caused by multipath effects or
interference ones being many or all of the corrupted
data to be done because the error correction code is
transmitted in a different part of the signal.
Received correctly. By using error coding techniques,
which does mean adding further data to the
transmitted signal, it enables
ORTHOGONALITY:
In OFDM the sub-carrier frequencies are chosen so
that the sub-carriers are orthogonal to each other,
meaning that cross-talk between the sub-channels is
eliminated and inter in OFDM spectrum, multiple
closely spaced orthogonal subcarrier signals with
overlapping spectra are transmitted to carry data in
parallel this is greatly simplifies the design of both the
transmitter and the receiver; unlike conventional
FDM, a separate filter for each sub-channel is not
required.
1. OFDM TRANSCEIVE EXPLANATION
OFDM is a Multi-Carrier Modulation (MCM)scheme,
which uses closely spaced multiple subcarriers to
transmit data. Data to be transmitted is split and
transmitted using multiple subcarriers instead of using
a single carrier. The key idea is instead of transmitting
at a very high bit rate, the data is transmitted over
multiple sub channels each carrying lower bit rates.
To generate OFDM successfully their relationship
between all the carriers must be carefullycontrolled to
maintain the orthogonality of the carriers. For this
reason, OFDM is generated by firstly choosing the
spectrum required based on the input data, and
modulation scheme used. Each carrier to be produced
is assigned same data to transmit. The required
amplitude and phase of them are calculated based on
the modulation scheme. OFDM system involves
mapping of symbols onto a set of orthogonal
subcarriers that are multiples of the base frequency.
This can be implemented in digital domain using Fast
Fourier Transform (FFT) and Inverse Fast Fourier
Transform (IFFT). These transforms are important
from OFDM perspective as they can be viewed as
mapping digital input data onto orthogonal
subcarriers. The IFFT takes frequency-domain input
data and converts it to the time-domain output data
(analog OFDM symbol waveform). This waveform is
transmitted by the OFDM transmitter. The receiver
receives the waveform and uses FFT transform to
convert the data back from time-domain into
frequency domain to recover the data back. This is
done by finding the equivalent wave for, generated by
a sum of orthogonal sinusoidal components. The
amplitude and phase of the sinusoidal components
represent the frequency spectrum of the time domain
signal. The IFFT performs the reverse process
transforming a spectrum (amplitude and phase of each
component) into a time domain signal. An IFFT
converts a number of complex data points, of length
that is a power of 2, into the time domain signal of the
same number of point’s .Each data point in frequency
spectrum used for an FFT or IFFT is called a bin. The
orthogonal carrier required for the OFDM signal can
be easily generated by setting the amplitude and phase
of each frequency.
2. PROBLE M OF PEAK-TO-AVERAGE
POWER RATIOIN OFDM SYSTEM
One of the most serious problems is the high peak to
average power ratio (PAPR) of the transmitted FDM
signal, since these large peaks introduce a serious
degradation in performance when the signal passes
through a nonlinear high power amplifier (HPA).
High PAPR results from the nature of the modulation
where multiple subcarriers/sinusoids are added
together to form the signal to be transmitted .When
sinusoid the peak magnitude.
Fig.2.OFDM Trans receiver Structure
Fig2 shows the configuration for a basic OFDM
Transmitter and Receiver
For an OFDM system with N sub-carriers, the peak
power of received signals is N times the average
power when phase values are the same .The PAPR of
baseband signal will reach its theoretical maximum
at( ) = 10log . For example, for a 16 sub-carrier
system, the maximum PAPR is 12 dB. Never the less,
this only a theoretically .In reality the probability of
reaching this maximum is very low.
5. International Journal of Trend in Scientific Research and Development @ www.ijtsrd.com eISSN: 2456-6470
@ IJTSRD | Unique Paper ID – IJTSRD52381 | Volume – 6 | Issue – 7 | November-December 2022 Page 1279
SPATIAL MULTIPLEXING:
Spatial multiplexing or space division multiplexing is
a multiplexing technique in MIMO wireless
communication, fiber-optic communication and other
communications technologies used to transmit
independent channels separated in space. It is MIMO
wireless protocol that sends separate data signals or
streams between antennae to enhance wireless signal
performance or functionality. It is a type of “spatial
diversity” and an engineering trick that helps to
increase the possibilities for various types of end- to-
end transmission.
Spatial multiplexing takes advantage of the
differences in the channels between transmitting and
receiving antennas pair to provide multiple
independent streams between the transmitting and
receiving antennas, increasing throughput by sending
data over parallel streams.
SPATIAL MULTIPLEXING FOR 5G
WIRELESS COMMUNICATIION:
In spatial multiplexing, is used in slow fading for 5G
wireless communication. Increased demand for higher
data rates and channel capacity is driving the need to
use the RF spectrum more efficiently. As a result, 5G
wireless system will use mm Wave frequency bands
to take advantage of the increased bandwidth. The
higher operating frequencies enable large-scale
antennae arrays, which can be used to mitigate serve
propagation loss in the mm wave band. Large arrays
can also be used to implement a MIMO system in
which unique signals can be transmitted from different
antenna elements in the array. MIMO system enables
spatial multiplexing technique that can be used to
improve data throughput.
5G system require a large antenna arrays, applying
digital weights on each antennae element is not always
practical due to cost and space limitations, so we use
hybrid beam forming techniques can be applied in a
mixed RF and digital beam forming system to
alleviate these restrictions. In a hybrid beam form
system, both the precoding weights and the combining
weights are combinations of baseband digital weights
and RF band analog weights. On transmit side, the
baseband digital weights modulate the incoming data
streams to form input signals at each RF chain and the
analog weights then translate the signal at each RF
chain to signal at each antennae element. The process
is reversed on the revive side.
CONCLUSION:
In this paper, we are find the solution of fading
reduce techniques. The first technique is OFDM
(orthogonal frequency diversity multiplexing), this
technique is the method of data transmission and is
used wireless data transmission. The second
technique is spatial multiplexing that is used to
transmit independent cannel separated in space. These
technologies are reduce fading problem.
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