Irregular LDPC (Low Density Parity Check) code is a powerful error correction code in wireless communication applications. However, irregular LDPC decoder has limited instruction-level parallelism. This paper exploits the thread-level parallelism of irregular LDPC decoders with simultaneous multi-threading (SMT) techniques. The simulations with random constructed parity check matrixes under different signal-to-noise ratios and three block lengths show that it can attain 16.7%~45.3% performance improvement by SMT technique with the area cost increasing by about 17.73%, which supposes that SMT is an efficient technique to improve the performance of irregular LDPC decoders.
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