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Improved coding-rotated-modulation orthogonal frequency division multiplexing system

Improved coding-rotated-modulation orthogonal frequency division multiplexing system

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An improved high-spectral-efficiency coding-rotated modulation (CRM)-iterative demodulation/decoding (ID) scheme in the orthogonal frequency division multiplexing (OFDM) system is proposed. For the rotated QAM, it unveils the optimum rotation matrix depending on the modulation order, the code rate and the receiver scheme (ID or non-ID). The suboptimal solution of the rotation angle is proposed, and a novel two-dimensional time/frequency component interleaver is also put forward to make the best use of the modulation diversity, time diversity and frequency diversity. Besides, code-matched four-dimensional QAM rotation matrices and the corresponding time/frequency component interleaver are proposed to improve the error performance furthermore. The analysis of extrinsic information transfer chart (EXIT) chart is also given to explain the convergence characteristic. Simulation results have turned out that this new scheme can significantly outperform the conventional BICM scheme.

References

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      • Kiyani, N.F., Weber, J.H.: `EXIT chart analysis of rotated MPSK constellations with BICM-ID, signal space diversity and OFDM', Proc. IEEE Symp. on Communications and Vehicular Technology, November 2008.
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      • 3rd Generation Partnership Project (3GPP), Technical Specification Group Radio Access Network (TS) 36.211, V8.5.0, Release 8, December 2008, pp. 44–50.
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      • Clevorn, T., Godtmann, S., Vary, P.: `PSK versus QAM for iterative decoding of bit-interleaved coded modulation', IEEE Global Telecommunications Conf.’04, 29 November–3 December 2004, 1, p. 341–345.
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      • Kiyani, N.F., Weber, J.H.: `OFDM with BICM-ID and rotated MPSK constellations and signal space diversity', 14thIEEE Symp. on Communications and Vehicular Technology in the Benelux, 2007.
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      • 3rd Generation Partnership Project (3GPP), Technical Specification Group Radio Access Network (TS) 36.212, V8.5.0, Release 8, December 2008, pp. 12–18.
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