Improved SISO MMSE Detection for Joint Coded-Precoded OFDM under Imperfect Channel Estimation

Guomei ZHANG  Shihua ZHU  Feng LI  Pinyi REN  

IEICE TRANSACTIONS on Communications   Vol.E93-B   No.3   pp.757-761
Publication Date: 2010/03/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.757
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
precoded OFDM,  iterative decoding,  soft-input soft-output detection,  channel estimation error,  

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An improved soft-input soft-output (SISO) minimum mean-squared error (MMSE) detection method is proposed for joint coding and precoding OFDM systems under imperfect channel estimation. Compared with the traditional mismatched detection which uses the channel estimate as its exact value, the signal model of the proposed detector is more accurate and the influence of channel estimation error (CEE) can be effectively mitigated. Simulations indicate that the proposed scheme can improve the bit error rate (BER) performance with fewer pilot symbols.