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| A soft interference probabilistic data association (SC-PDA ) detector is proposed for multiple-input, multiple-output (MIMO) system, which can provide a better performance than probabilistic data association (PDA) detector with lower complexity. The MIMO doubly-iterative receiver consists of two iterative decoding loops. In the outer loop, the soft information is exchanged between the MIMO detector and the LDPC decoder. In the inner loop, it is exchanged between variable node and check node decoders inside the LDPC decoder. On the light of the extrinsic information transfer (EXIT) chart technique, a LDPC code degree profile optimization algorithm is developed for the doubly-iterative receiver. Simulation results show the doubly-receiver with SC-PDA can have a better performance than the one with PDA, additional performance gains can be achieved by employing the optimized irregular LDPC code than the regular one. |
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| Keywords:probabilistic data association (PDA), multiple-input, multiple-output (MIMO), low-density parity-check codes (LDPC), extrinsic information transfer (EXIT) chart |
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