An Integrated Linear Programming Receiver for LDPC Coded MIMO-OFDM Signals

This work investigates the joint detection and decoding of MIMO-OFDM signals. Traditional receivers either utilize disjoint serial detector and decoder or require turbo message passing between the two functional blocks of detection and decoding. We present a novel approach that can jointly achieve detection and decoding of low density parity check (LDPC) coded multiple-input-multiple-output (MIMO) orthogonal-frequency-division-multiplexing (OFDM) signals as a unified optimization algorithm. Our receiver integrates the MIMO-OFDM signal detection and the decoding of LDPC coded data by formulating a linear programming problem regardless of affine or nonaffine quadrature amplitude modulation (QAM) mapping. The proposed joint MIMO-OFDM detector and decoder achieves substantial performance gain over existing joint detection receivers of comparable computational complexity. Furthermore, the proposed receiver also substantially outperforms the more traditional turbo receiver with only modest cost in complexity.