A Simple Expression of BER Performance in COFDM Systems over Fading Channels

Fumihito SASAMORI  Yuya ISHIKAWA  Shiro HANDA  Shinjiro OSHITA  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E92-A   No.1   pp.332-336
Publication Date: 2009/01/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E92.A.332
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Communication Theory and Signals
COFDM,  diversity combining,  fading correlation,  eigenvector conversion,  closed form equation,  

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Both adaptive modulation and diversity combining are attractive techniques to combat fading and these two can be applicable to each digital-modulated symbol in OFDM transmission. In this letter, aiming to combat severe fading more effectively than the adaptive modulation, we theoretically analyze the benefit of a frequency diversity scheme within one OFDM symbol, which is a simple kind of coded OFDM (COFDM) based on IEEE 802.16 protocols. A simple closed form equation of bit error rate (BER) is derived, and then the advantages of correlated diversity gain and interference suppression by the diversity scheme are verified by both theoretical analysis and Monte Carlo simulation.