Abstract: Antenna diversity uses two or more antennas to improve the quality and reliability of a wireless link where there is not a 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 even distortions can destructively interfere with one another at the aperture of the receiving antenna. Antenna diversity is effective at mitigating these multipath situations. This paper investigates the various antenna diversity techniques and combining techniques.

Keywords: Correlated channels, wireless communication, multiple antennas, multipath fading.