346 / 2015-01-07 13:42:15

An Iterative Bit-interleaved Coded Multiuser Detection For Mc-mfsk Multiple Access Systems

MCMFSK

This paper studies an iterative bit-interleaved coded multiuser detection multicarrier M-ary frequency shift keying (MC MFSK) multiple access system to increase system performance under specific signal-to-noise ratio. At multiuser detection side, soft metric for each symbol is quantized with 2 levels (2L) or 3 levels (3L) and then pass to the decoder. When the soft output of a symbol from decoder exceeds a threshold, the user is declared as a reliable user. The reliable information is fed back to the detection side and updates the symbol soft output when iterative processing is carried out. Numerical results show that system performance is improved over Rayleigh fading.