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A space–time code (STC) is a method employed to improve the reliability of data transmission in wireless communication systems using multiple transmit antennas. STCs rely on transmitting multiple, redundant copies of a data stream to the receiver in the hope that at least some of them may survive the physical path between transmission and ...
The front cover of the 1979 Neiman-Marcus Christmas catalog featured the first home satellite TV stations on sale. [2] The dishes were nearly 20 feet (6.1 m) in diameter. [ 3 ] The satellite dishes of the early 1980s were 10 to 16 feet (3.0 to 4.9 m) in diameter [ 4 ] and made of fiberglass with an embedded layer of wire mesh or aluminium foil ...
A 2.4 GHz Subscriber Module with Reflector Dish A 5.2 GHz Subscriber Module with a 'Stinger' Passive Antenna. A typical Canopy setup consists of a cluster of up to six co-located standard access points (AP), each with a 60 degree horizontal beamwidth antenna, to achieve 360 degree coverage. The most commonly used APs are available in 120, 180 ...
[43]: 97 [18]: 207 Typically, an array of four, or more, squinted directional antennas is used to give 360 degree coverage. [44]: 155 [18]: 101 [45]: 5–8.7 [43]: 97 [46] DF by phase comparison methods can give better bearing accuracy, [45]: 5–8.9 but the processing is more complex. Systems using a single rotating dish antenna are more ...
These two matrices give examples of why codes for more than two antennas must sacrifice rate — it is the only way to achieve orthogonality. One particular problem with C 3 , 3 / 4 {\displaystyle C_{3,3/4}} is that it has uneven power among the symbols it transmits.
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In one well-documented case it was impossible to receive GPS signals in the entire harbor of Moss Landing, California due to unintentional jamming caused by malfunctioning TV antenna preamplifiers. [27] [28] Intentional jamming is also possible. Generally, stronger signals can interfere with GPS receivers when they are within radio range or ...
HawkEye 360 is an American geospatial analytics company headquartered in Herndon, Virginia. The company specializes in the collection and analysis of radio frequency (RF) signal location data using a constellation of satellites .