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PSK versus QAM for Iterative Decoding of Bit-Interleaved Coded Modulation

Authors:

Thorsten Clevorn, Susanne Godtmann, and Peter Vary

Book Title:

Proceedings of IEEE Global Telecommunications Conference (GLOBECOM)

Volume:

1

Date:

Nov. 2004

Pages:

341–345

Language:

English

Abstract

Bit-interleaved coded modulation with iterative decoding (BICM-ID) is a transmission scheme with excellent performance on fading channels. The mapping of the bit patterns to the elements of the signal constellation set (SCS) is the key design element of BICM-ID, especially regarding the asymptotic performance of the BER. We demonstrate that SCSes of PSK (phase shift keying) with optimum bit pattern assignment are significantly superior in the asymptotic error-floor region to the respective square QAM (quadrature amplitude modulation) SCSes. When modifying the PSK SCSes to non-regular SCSes, performance gains of more than 1 dB are realizable in the case of 4 bits-per-channel symbols. The achievable gains are theoretically determined and analyzed, and verified by simulations.

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