Antenna diversity, also known as space diversity, is any one of several wireless diversity schemes that uses two or more antennas to improve the quality and reliability of a wireless link. Often, especially in urban and indoor environments, there is no clear line-of-sight (LOS) between transmitter and receiver. Instead the signal is reflected along multiple paths before finally being received. Each of these bounces can introduce phase shifts, time delays, attenuations, and distortions that can destructively interfere with one another at the aperture of the receiving antenna.
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Some articles on antenna diversity:
... Diversity Coding is the spatial coding techniques for a MIMO system in wireless channels ... Fundamentally, diversity coding sends multiple copies through multiple transmit antennas, so as to improve the reliability of the data reception ...
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