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Performance of ReedSolomon Coded MCDSCDMA with Biorthogonal Modulation
Hirokazu TANAKA Kyung Woon JANG Shoichiro YAMASAKI Miki HASEYAMA
Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Vol.E92A
No.10
pp.26002608 Publication Date: 2009/10/01
Online ISSN: 17451337
DOI: 10.1587/transfun.E92.A.2600
Print ISSN: 09168508 Type of Manuscript: PAPER Category: Spread Spectrum Technologies and Applications Keyword: multicarrier CDMA, OFDM, biorthogonal modulation, ReedSolomon code, error correction code,
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Summary:
In this paper, an error correction scheme suitable for MCDSCDMA system with biorthogonal modulation is proposed. The input sequence of a biorthogonal modulator consists of n  1 bit code selection bit sequence and 1 bit sign bit sequence. In order to apply an efficient error correction code, the following points should be considered; (1) if the code selection bits can be protected sufficiently, the sign bit error can also be reduced sufficiently, (2) since a code selection bit sequence consists of n  1 bits, employing a symbol error correcting code is more effective for encoding code selection bits, (3) the complexity of the error correction encoder and decoder implementations should be minimum. Based on these conditions, we propose to employ ReedSolomon (RS) code for encoding the code selection bits and no error correction code for the sign bit. Additionally, detection algorithm at the biorthogonal demodulator is modified for compensating degradations of the sign bit error rate performance. The performance in an Additive White Gaussian Noise (AWGN) channel is evaluated by both theoretical analysis and computer simulations. The performance evaluations by simulations on multipath fading channels are also shown. It is shown that the proposed scheme has remarkable improvement.

