Theoretical derivation method of bit error rate in maximal ratio combining TDD transmitter diversity

The paper proposes a theoretical method to derive the BER performance in maximal ratio combining (MRC) time division duplex (TDD) transmitter diversity, with parameters of CNR, Doppler frequency, etc. The proposed theoretical approach can be applied not only to single-carrier transmission under flat fading, but also to orthogonal frequency division multiplexing (OFDM) under frequency selective fading. We choose OFDM transmission, in addition to single-carrier transmission, as a system model example to obtain numerical results, and the comparison between the theoretical results and simulated ones is demonstrated to confirm the validity of the proposed theoretical approach.