Boosts to LDPC-coded IDMA systems

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Boosts to LDPC-coded IDMA systems

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© The Institution of Engineering and Technology
Published

A node-by-node joint multi-user iterative decoding strategy, instead of the detector-decoder loop strategy, is proposed based on the factor graph representation of the LDPC-coded IDMA system. To analyse the proposed iterative decoding process, a Gaussian approximation based density evolution algorithm is designed. The degree distributions of LDPC codes are optimised for the IDMA system when the system bandwidth efficiency is 1.

Inspec keywords: approximation theory; graph theory; multi-access systems; interleaved codes; iterative decoding; Gaussian processes; parity check codes

Other keywords: low-density parity-check codes; node-by-node joint multiuser iterative decoding strategy; factor graph representation; degree distribution; Gaussian approximation; interleave-division multiple-access ssytem; density evolution algorithm; LDPC-coded IDMA systems

Subjects: Interpolation and function approximation (numerical analysis); Other topics in statistics; Multiple access communication; Combinatorial mathematics; Codes

References

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      • Storn, R., Price, K.: `Minimizing the real functions of the ICEC' 96 contest by differential evolution', Proc. of IEEE Int. Conf. on Evolutionary Computation, May 1996, Nagoya, Japan, p. 842–844.
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    3. 3)
      • Luo, Y., Wang, L., Ling, J.: `The coding-spreading trade-off in LDPC-coded interleave-division multiple-access (IDMA) system', Proc. of IEEE Int. Conf. on Communication Technology, November 2006, Guilin, China, p. 1–4.
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