Adaptive Coupling Method Based on Optimal Subcarrier Spacing for OFDM System

Yi WANG  Qianbin CHEN  Xing Zhe HOU  Hong TANG  Zufan ZHANG  Ken LONG  

IEICE TRANSACTIONS on Communications   Vol.E96-B   No.1   pp.360-362
Publication Date: 2013/01/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E96.B.360
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
intercarrier interference (ICI),  frequency diversity,  OFDM,  

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Orthogonal frequency division multiplexing (OFDM) is very sensitive to the frequency errors caused by phase noise and Doppler shift. These errors will disturb the orthogonality among subcarriers and cause intercarrier interference (ICI). A simple method to combat ICI is proposed in this letter. The main idea is to map each data symbol onto a couple of subcarriers rather to a single subcarrier. Different from the conventional adjacent coupling and symmetric coupling methods, the frequency diversity can be utilized more efficiently by the proposed adaptive coupling method based on optimal subcarrier spacing. Numerical results show that our proposed method provides a robust signal-to-noise ratio (SNR) improvement over the conventional coupling methods.