Iterative decoding of multilevel and bit-interleaved coded modulation

Abstract

A comparative study of various coded modulation schemes is carried out in terms of their different block length, number of iterations and complexity, quantified by the number of trellis states as well as the EXtrinsic Information Transfer (EXIT) charts are used for analysing their decoding convergence and Bit Error Ratio (BER). A three- Dimensional (3-D) EXIT chart is introduced for MultiLevel Coding (MLC) invoking Multistage Decoding (MSD). Based on this 3-D EXIT chart, we design a precoded- MLC scheme employing both MSD and Parallel Independent Decoding (PID). In order to provide space diversity, we study the new arrangement of Bit-Interleaved Coded Modulation with Iterative Decoding (BICM-ID) and MLC combined with Space Time Block Codes (STBC) invoking a novel Sphere Packing (SP) modulation scheme. An equivalent-capacity-based design of MLCs based on this SP modulation is pro- posed. We use the Binary Switching Algorithm (BSA) to optimise our cost function for the sake of obtaining appropriate bit-to-SP-symbol mapping schemes. A hybrid mapping scheme is introduced for achieving unequal error protection. Furthermore, bit-to-SP-symbol mapping to 256 constellation points is designed for a serially concate- nated BICM-ID aided twin-antenna STBC arrangement for creating a system, which is capable of outperforming an identical-throughput 16-level Quadrature Amplitude Modulation (16QAM) scheme. Furthermore, the benefits of MLC PID designs employing Generalised Low Density Parity Check (GLDPC) codes are investigated, which results in a low-delay scheme useful for multimedia transmission. A stopping criterion is designed for this scheme for the sake of terminating the iterative decoding process, once the target BER is attained. We then contrive coding schemes for the wireless Internet by introducing a BICM-ID scheme combined with Luby Transform (LT) coding constructed for the

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