Performance evaluation of SVD-MIMO-OFDM system with a thinned-out number of precoding weights

We are designing system parameters for manufacturing a prototype SVD-based 4×4 MIMO-OFDM system with our adaptive bit and power allocation (ABPA) algorithm. Designing the parameters at the cost of a minimum amount of feedback is important to achieve high spectral efficiency in time division duplex (TDD) systems. We constructed a performance evaluation system for the SVD-based MIMO system and evaluated the bit error rate (BER) performances when the number of precoding weights fed back was thinned out under three MIMO channel models with different delay spreads. The measurement results demonstrated that the amount of feedback can be reduced by one eighth in the model with the largest delay spread, keeping BER performance degradation.