Diversity Combining for Mobile Communications
نویسنده
چکیده
The maximal-ratio combining (MRC) scheme is investigated in detail. Other diversity combining schemes, such as selection combining (SC) and equal gain combining (EGC) are outperformed by MRC in the case of coherent communications. First, the case of M independent fading channels is considered. The output signal-tonoise ratio (SNR) expression is derived, and an expression for the bit error rate (BER) is determined. Simulations of the channels are performed and the results are compared to the theoretical BER. Then, the case of M correlated fading channels is considered, and an analysis that is similar to the case of independent fading is performed. We also investigate the effects of varying the separation between antennas at both the mobile and base stations. Finally, a simple space-time coding scheme, known as the Alamouti block scheme, is demonstrated and simulation results are given.
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