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Characteristics of a wireless communication channel are subjected to a large   scale deterioration process, referred to as the problem of fading. This   paper discusses different techniques for mitigating the fading problems. One   solution to the problem is to add a fading margin on the transmitter, but it   is not an effective solution. The other solution is to use an alternative   statistical behavior of fading channels (applying the basic concepts of   diversity), which use two or more inputs on the receiver to ensure the   correlation of signal. So, the diversity technique is used to improve system   performance in fading channels. Instead of transmitting and receiving the   desired signal through one channel, we have L copies of desired signal   transferred over M different channels. This paper presents analytical   results of the probability of error for diversity techniques which use   Rayleigh Fading Channel for BPSK modulation

An overview and analysis of BER for three diversity techniques in wireless communication systems