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This paper presents two enhancements for improving the convergence behavior of bit-interleaved coded modulation iterative decoding (BICM-ID) in multiple-input multiple-output (MIMO) systems. As typical tree search based MIMO demapping algorithms for BICM-ID are based on the suboptimal Max-Log-MAP (maximum a-posteriori) criterion, the first enhancement aims at correcting the outputs of such MIMO demappers...
Continuous Phase Modulation (CPM) provides an attractive option for spectral efficient communication systems. Low-Density Parity-Check Code (LDPCC) combined with CPM has a potential to result in a spectrally efficient scheme that is also energy efficient in that it yields low error rates at low signal-to-noise ratios. In this paper we consider the concatenation of a LDPC encoder and a CPM modulator...
Performances of BICM-ID systems strongly depend on the matching between mapping rule and code structure. This paper proposes a combined use of extended mapping (EM) and simple repetition code. Even with such a simple structure, turbo cliff happens at a value range of signal-to-noise power ratio (SNR) 1~2 dB to the Shannon limit. This paper then introduces check node as well as irregular node degree...
Concatenated coding schemes with interleavers consist of a combination of two simple constituent encoders and an interleaver. The parallel concatenation known as "turbo code" has been shown to yield remarkable coding gains close to theoretical limits, yet admitting a relatively simple iterative decoding technique. Serially concatenated convolutional code (SCCC) proposed by S.Benedetto may...
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