Microwave radio relay is a technology that transmits signals such as telephone calls and television programs between two locations using directional antennas and radio waves. Multiple microwave radio relays can be connected to form a microwave network for long-distance communication. Planning considerations for microwave radio relay systems include having a line of sight between locations and avoiding obstacles that could attenuate the radio signals.
Topics covered in this presentation:
Radio & Microwave Communication.
2. Spectrum Management.
3. Digital Microwave Systems.
4. Fading and measures to counter Fading effect.
5. Digital Microwave link – Performance Objectives.
6. Modulation Methods.
7. A word about BWA
8. Other wireless communication Applications
It is description about trunking theory that is used to develop trunked system that can allocate a limited number of channels to a large number of users.
Massive MIMO (also known as “Large-Scale Antenna Systems”, “Very Large MIMO”, “Hyper MIMO”, “Full-Dimension MIMO” and “ARGOS”) makes a clean break with current practice through the use of a large excess of service-antennas over active terminals and time division duplex operation. Extra antennas help by focusing energy into ever-smaller regions of space to bring huge improvements in throughput and radiated energy efficiency. Other benefits of massive MIMO include the extensive use of inexpensive low-power components, reduced latency, simplification of the media access control (MAC) layer, and robustness to intentional jamming. The anticipated throughput depend on the propagation environment providing asymptotically orthogonal channels to the terminals, but so far experiments have not disclosed any limitations in this regard. While massive MIMO renders many traditional research problems irrelevant, it uncovers entirely new problems that urgently need attention: the challenge of making many low-cost low-precision components that work effectively together, acquisition and synchronization for newly-joined terminals, the exploitation of extra degrees of freedom provided by the excess of service-antennas, reducing internal power consumption to achieve total energy efficiency reductions, and finding new deployment scenarios.
Topics covered in this presentation:
Radio & Microwave Communication.
2. Spectrum Management.
3. Digital Microwave Systems.
4. Fading and measures to counter Fading effect.
5. Digital Microwave link – Performance Objectives.
6. Modulation Methods.
7. A word about BWA
8. Other wireless communication Applications
It is description about trunking theory that is used to develop trunked system that can allocate a limited number of channels to a large number of users.
Massive MIMO (also known as “Large-Scale Antenna Systems”, “Very Large MIMO”, “Hyper MIMO”, “Full-Dimension MIMO” and “ARGOS”) makes a clean break with current practice through the use of a large excess of service-antennas over active terminals and time division duplex operation. Extra antennas help by focusing energy into ever-smaller regions of space to bring huge improvements in throughput and radiated energy efficiency. Other benefits of massive MIMO include the extensive use of inexpensive low-power components, reduced latency, simplification of the media access control (MAC) layer, and robustness to intentional jamming. The anticipated throughput depend on the propagation environment providing asymptotically orthogonal channels to the terminals, but so far experiments have not disclosed any limitations in this regard. While massive MIMO renders many traditional research problems irrelevant, it uncovers entirely new problems that urgently need attention: the challenge of making many low-cost low-precision components that work effectively together, acquisition and synchronization for newly-joined terminals, the exploitation of extra degrees of freedom provided by the excess of service-antennas, reducing internal power consumption to achieve total energy efficiency reductions, and finding new deployment scenarios.
5G NR is a contradictory complex, and it is difficult to have both capacity and coverage. 5G expands the system capacity by expanding the bandwidth of the spectrum. The frequency range extends from below 3GHz in the 4G era to the millimeter wave band, and the single carrier bandwidth is increased from 20MHz to more than 100MHz. But the higher the frequency band, the smaller the coverage of the base station, and the operator has to build more base stations.
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.
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How to Make a Field invisible in Odoo 17Celine George
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2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
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Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
Introduction to AI for Nonprofits with Tapp NetworkTechSoup
Dive into the world of AI! Experts Jon Hill and Tareq Monaur will guide you through AI's role in enhancing nonprofit websites and basic marketing strategies, making it easy to understand and apply.
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.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
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2. What is Microwave Radio Relay? Have you ever noticed a cell phone tower?? If so , have you ever wondered what are those shapes of frustum (in informal way , kind of looking like white colored loud speakers) Well , actually they are our topic of study for the moment, “ Microwave Radio Relay System”
3. Microwave Radio Relay Microwave radio relay is a technology for transmitting digital and analog signals , such as long-distance telephone calls and the relay of television programs to transmitters, between two locations on a line of sight radio path. In microwave radio relay, radio waves are transmitted between the two locations with directional antennas , forming a fixed radio connection between the two points. Long daisy-chained series of such links form transcontinental telephone and/or television communication systems
4. Formation & Function Of Microwave Relay As multiple chains of microwave radio relays are set up, they can form a microwave network . Because all of these relays occur within "lines of sight" there is only a very narrow area that the radio wave passes through. These antennas tend to be installed at high elevations, so as to avoid obstacles, because each antenna needs to broadcast long distances very accurately . This, however, allows for very economical use of radio power and allows for a narrower frequency range , due to less interference.
5. Planning Considerations Because of the high frequencies used, a quasi-optical line of sight between the stations is generally required. Additionally, in order to form the line of sight connection between the two stations, the first Fresnel zone must be free from obstacles so the radio waves can propagate across a nearly uninterrupted path. Obstacles in the signal field cause unwanted attenuation, and are as a result only acceptable in exceptional cases. High mountain peak or ridge positions are often ideal: Europe's highest radio relay station, the Richtfunkstation Jungfraujoch , is situated atop the Jungfraujoch ridge at an altitude of 3,705 meters (12,156 ft) above sea level. Multiple antennas provide space diversity Obstacles, the curvature of the Earth, the geography of the area and reception issues arising from the use of nearby land (such as in manufacturing and forestry) are important issues to be considered . It is essential that "path profiles" are produced, which provide information about the terrain and Fresnel zones affecting the transmission path. The presence of a water surface, such as a lake or river, in the mid-path region also must be taken into consideration as it can result in a near-perfect reflection (even modulated by wave or tide motions), creating multipath distortion as the two received signals ("wanted" and "unwanted") swing in and out of phase. Multipath fades are usually deep only in a small spot and a narrow frequency band, so space and frequency diversity schemes were usually applied in the third quarter of the 20th century. The effects of atmospheric stratification cause the radio path to bend downward in a typical situation so a major distance is possible as the earth equivalent curvature increases from 6370 km to about 8500 km (a 4/3 equivalent radius effect) . Rare events of temperature, humidity and pressure profile versus height, may produce large deviations and distortion of the propagation and affect transmission quality. High intensity rain and snow must also be considered as an impairment factor, especially at frequencies above 10 GHz. All previous factors, collectively known as path loss , make it necessary to compute suitable power margins, in order to maintain the link operative for a high percentage of time, like the standard 99.99% or 99.999% used in 'carrier class' services of most telecommunication operators .
6. Over-horizon microwave radio relay In over-horizon, or tropospheric scatter , microwave radio relay, unlike a standard microwave radio relay link, the sending and receiving antennas do not use a line of sight transmission path . Instead, the stray signal transmission, known as "tropo - scatter" or simply "scatter," from the sent signal is picked up by the receiving station. Signal clarity obtained by this method depends on the weather and other factors, and as a result a high level of technical difficulty is involved in the creation of a reliable over horizon radio relay link. Over horizon radio relay links are therefore only used where standard radio relay links are unsuitable (for example, in providing a microwave link to an island).
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8. Overlook Of Microwave Networks Microwave networks were originally popularized in the 1950's as a way of transmitting long distance calls, as well as television signals between continents. During the 1950s the AT&T Communications system of microwave radio grew to carry the majority of US Long Distance telephone traffic , as well as intercontinental television network signals . The prototype was called TDX which was set up between New York and Boston in 1947. The TDX was improved to the TD, then later to the TD3 that used solid state electronics . The main motivation in 1946 to use microwave radio instead of cable was that a large capacity could be installed quickly and at less cost . It was expected that this would be cheap. There were two main reasons that a large capacity had to be introduced suddenly: Pent up demand for long distance telephone service, because of the hiatus during the war years. the new medium of television, which needed more bandwidth than radio. By 1980s the technology lost its share of fixed operation to newer technologies such as fiber-optic cable and optical radio relay links, both of which offer larger data capacities at lower cost per bit . Communication satellites , which are also microwave radio relays, better retained their market share, especially for television. Now, they are being used increasingly in portable radio applications . The technology is particularly suited to this application because, lower operating costs , a more efficient infrastructure , provision of direct hardware access to the portable radio operator .