Abstract

The latest multiple-input multiple-output (MIMO) wireless systems have adopted iterative detection and decoding (IDD) to reduce the signal-to-noise ratio (SNR) required fora reliable transmission. An IDD system consists of a soft-in soft-out (SISO) detector to cancel interference, and a SISO forward-error correction (FEC) decoder to remove errors. The two blocks exchange soft information to improve the SNR iteratively. State-of-the-art IDDs based on sphere decoding (SD) and low-density parity-check (LDPC) FEC have been demonstrated in [1], [2] for up to 4×4 64-QAM MIMO, achieving 396Mb/s detection [1] and 586Mb/s decoding [2]. Compared to an SD detector [1]-[3], a minimum mean-square error (MMSE) detector [4] has a lower complexity and can be easily scaled to support a high-order modulation for a high data rate and spectral efficiency. Compared to LDPC FEC [1-3], nonbinary LDPC (NBLDPC) FEC offers better coding gain [5] and improves the detection-decoding performance [6]. Despite NBLDPC's higher complexity, efficient approximate decoding [5] is possible and it is well suited for a high-order modulation.

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