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Performance of generalized soft-output demapper for LDPC-CFMT system over frequency selective fading channel

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3 Author(s)
Qiang Li ; Nat. Mobile Commun. Res. Lab., Southeast Univ., Nanjing, China ; GuangguoBi ; Peng Du

In this paper, we proposed the LDPC coded FMT systems and showed that the LDPC codes are effective to improve the bit error rate of FMT in frequency selective fading channel. When the LDPC codes are used for the FMT systems in mobile communications, especially in high bit rate applications, high bandwidth efficiency is required, and thus the high-order modulation is preferred. In this paper, we also propose a new soft decision metric generation method, which obviates the need of the noise variance estimation, for M-PSK/M-QAM modulation over frequency selective fading channel. Computer simulation indicates that there is no performance loss with our new metric, but the complexity of implementation is reduced.

Published in:

Emerging Technologies: Frontiers of Mobile and Wireless Communication, 2004. Proceedings of the IEEE 6th Circuits and Systems Symposium on  (Volume:2 )

Date of Conference:

31 May-2 June 2004