Trellis-Coded OFDM Signal Detection with Maximal Ratio Combining and Combined Equalization and Trellis Decoding

SeongSik LEE
Jeong Woo JWA
HwangSoo LEE

IEICE TRANSACTIONS on Communications   Vol.E80-B       pp.632-638
Publication Date: 1997/04/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Category: Radio Communication
frequency division multiplexing,  equalization,  diversity,  trellis coded modulation (TCM),  noise feedback equalization,  

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We propose an improved orthogonal frequency division multiplexing (OFDM) signal detector which uses the minimum mean-square error (MMSE) noise feedback equalization (NFE). The input bit stream is trellis-coded to form OFDM signal blocks and the maximal ratio combining (MRC) is adopted at the receiver in order to improve the performance of the detector. As a result, we obtain significantly improved detection performance compared with the conventional OFDM receivers as follows. Using the proposed MMSE-NFE in the receiver, we can obtain the performance gain of about 1.5 dB to 2 dB in symbol energy to noise power spectral density (Es/No) for Doppler frequencies of fd=20 and 100 Hz, respectively, over the receiver with the MMSE linear equalization (LE) alone at symbol error rate (SER) of about 10-3. With MRC and trellis coding, the performance gain of about 11 dB in Es/No for fd=20 and 100 Hz at SER of about 10-3 is obtained.