In this chapter we examine the capacity of a single-user wireless channel where transmitter and/or receiver have a single antenna. We will discuss capacity for channels that are both time invariant and time varying. We first look at the well-known formula for capacity of a time-invariant additive white Gaussian noise (AWGN) channel and then consider capacity of time-varying flat fading channels. We will first consider flat fading channel capacity where only the fading distribution is known at the transmitter and receiver. We will also treat capacity of frequency-selective fading channels. For time -invariant frequency-selective channels the capacity is known and is achieved with an optimal power allocation that water-fills over frequency instead of time. We will consider only discrete-time systems in this chapter.
There are many types of wireless channel impairments such as noise, path loss, shadowing, and fading and impairment Mitigation techniques should be adopted according to system requirements and channel environments.
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 this chapter we examine the capacity of a single-user wireless channel where transmitter and/or receiver have a single antenna. We will discuss capacity for channels that are both time invariant and time varying. We first look at the well-known formula for capacity of a time-invariant additive white Gaussian noise (AWGN) channel and then consider capacity of time-varying flat fading channels. We will first consider flat fading channel capacity where only the fading distribution is known at the transmitter and receiver. We will also treat capacity of frequency-selective fading channels. For time -invariant frequency-selective channels the capacity is known and is achieved with an optimal power allocation that water-fills over frequency instead of time. We will consider only discrete-time systems in this chapter.
There are many types of wireless channel impairments such as noise, path loss, shadowing, and fading and impairment Mitigation techniques should be adopted according to system requirements and channel environments.
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.
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.
Wavelet analysis and its use in signal processing. Applications of wavelets in Image processing. Wavelet transform used in both continuous and discrete cases to get better analysis of signals
This presentation deals with topics such as Electromagnetic Spectrum, Wireless Propagation, Signals, Signal propagation effects, Spread spectrum and cellular systems.
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
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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
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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.
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• 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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Normal Labour/ Stages of Labour/ Mechanism of LabourWasim Ak
Normal labor is also termed spontaneous labor, defined as the natural physiological process through which the fetus, placenta, and membranes are expelled from the uterus through the birth canal at term (37 to 42 weeks
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.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
2. Fading Distributions
• Describes how the received signal amplitude changes with time.
• Remember that the received signal is combination of multiple signals
arriving from different directions, phases and amplitudes.
• With the received signal we mean the baseband signal, namely the
envelope of the received signal (i.e. r(t)). (The envelope of
an oscillating signal is a smooth curve outlining its extremes)
• Fading Distribution is a statistical characterization of the multipath fading.
This fading characteristics of a mobile radio signal are described by the
following three statistical distributions -
• Rician Distribution
• Rayleigh Distribution
• Lognormal Distribution
3. Rayleigh Distributions
• Describes the received signal envelope distribution for channels,
where all the components are non-LOS:
• i.e. there is no line-of–sight (LOS) component.
4. Rayleigh Fading Distribution
• The Rayleigh distribution is commonly used to describe the statistical time
varying nature of the received envelope of a flat fading signal, or the
envelope of an individual multipath component.
• The Rayleigh distribution is given as:
• is the rms value of the received voltage before envelope detection, 2 is
the time-average power/local average power of the received signal before
envelope detection and r2 is instantaneous power.
p r
r r
r
r
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exp( )
2
2
2
2
0
0 0
5. Ricean Distributions
• Describes the received signal envelope distribution for
channels where one of the multipath components is LOS
component.
• i.e. there is one LOS component.
6. Ricean Fading Distribution
• When there is a dominant stationary signal component present, the small-scale
fading envelope distribution is Ricean. The effect of a dominant signal arriving
with many weaker multipath signals gives rise to the Ricean distribution.
• The Ricean distribution degenerates to a Rayleigh distribution when the
dominant component fades away.
• The Ricean distribution is often described in terms of a parameter K which is
defined as the ratio between the deterministic signal power and the variance of
the multipath.
• K is known as the Ricean factor
• As A0, K - dB, Ricean distribution degenerates to Rayleigh distribution.
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7. PDF
• Probability density function of Ricean distributions: K=-∞dB
(Rayleigh) and K=6dB. For K>>1, the Ricean pdf is approximately
Gaussian about the mean.
8.
9. • Propagation path-loss models play an important role in the design
of cellular systems to specify key system parameters such as
transmission power, frequency, antenna heights, and so on.
• Several models have been proposed for cellular systems operating in
different environments (indoor, outdoor, urban, suburban, rural).
• Okumura Model
• Hata Model
• Cost 231 Model
Propagation Path-Loss Models
10. • The Okumura model is a Radio propagation model that was built
using the data collected in the city of Tokyo, Japan.
• The model is ideal for using in cities with many urban structures but
not many tall blocking structures.
• The model served as a base for the Hata Model.
• Okumura model was built into three modes.
• Urban, suburban and open areas.
• The model for urban areas was built first and used as the base for
others.
Okumura model
11. 50% of measured
values lie above
this threshold and
50% of measured
values lie below
this threshold value
Clutter is a term used for unwanted echoes in electronic systems, particularly in reference to radars. Such echoes are typically returned from ground, sea, rain, animals/insects, chaff and atmospheric turbulences, and can cause serious performance issues with radar systems.
If a child's weight is at the 50th percentile line, that means that out of 100 normal children her age,
50 will be bigger than she is and 50 smaller.
Similarly, if she is in the 75th percentile, that means that she is bigger than 75 children and smaller than only 25, compared with 100 children her age
Quasi-public space" is land that is open to all comers but which is under private ownership – classically, the public areas of shopping centres. As the law stands, owners of quasi-public space have absolute discretion over who can enter their property and what they can do there.
Empirical studies: It is a way of gaining knowledge by means of direct and indirect observation or experience.