Joint Turbo Receiver for LDPC-Coded MIMO Systems Based on Semi-definite Relaxation
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Semi-definite relaxation (SDR) has been shown to have the capability of approaching maximum-likelihood (ML) performance. In this work, we first develop a new SDR-based detector that jointly uses forward error correction (FEC) code information in the detection stage. The joint SDR detector substantially improves overall receiver performance by generating highly reliable information to downstream decoder. For further performance improvement, the joint SDR detector is connected with decoder using a feedback link to form an iterative turbo receiver. Meanwhile, we propose a simplified SDR receiver that solves only one SDR problem per codeword instead of solving multiple SDR problems in the iterative turbo processing. This scheme significantly reduces the complexity of SDR turbo receiver, while the error performance remains similar as before.
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