Bypass Decoding: A Reduced-Complexity Decoding Technique for LDPC-Coded MIMO-OFDM Systems

In this paper, the authors propose a simple reduced-complexity decoding technique called bypass decoding for Low-Density Parity-Check (LDPC)-coded Multiple-Input - Multiple-Output (MIMO) Orthogonal Frequency-Division Multiplexing (OFDM) systems. Employing the bypass decoding technique, the receiver of an LDPC-coded MIMO-OFDM system decodes a codeword in two steps based on the Log-Likelihood Ratios (LLRs) of coded bits. The hard decisions are first made on the coded bits whose LLRs have magnitudes above a certain threshold, and the rest of the coded bits will next be decoded by using an iterative receiver.