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Performance evaluation of TDD-SVD-MIMO system with feedback delays

The authors have been researching a 4×4 SVD-MIMO-OFDM system that adaptively changes transmitter weights and modulation schemes in accordance with feedback information received by a TDD. This report presents our evaluation of the effects of feedback delays due to the TDD on the BER performance of the proposed system. The computer simulation results revealed that the required normalized SNR of a system with the shortest feedback delay of 2 ms degraded about 1 dB from that of an ideal system without feedback delays. In this case, the results showed that the system improved the required normalized SNR by about 4 dB in comparison with that of a fixed modulation MIMO-OFDM system.