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Multiple Access Interference Cancellation for IFDMA Systems with Frequency Offsets  

Kim, Jeong-Woo (충북대학교 전자공학과)
Won, Yu-Jun (충북대학교 전자공학과)
Seo, Bo-Seok (충북대학교 컴퓨터정보통신연구소)
Publication Information
Journal of Satellite, Information and Communications / v.6, no.1, 2011 , pp. 32-36 More about this Journal
Abstract
In this paper, we propose a cancellation scheme of multiple access interference (MAI), which is caused by carrier frequency offset, for the receiver of an interleaved orthogonal frequency division multiple access (IFDMA) uplink system. In the IFDMA systems, carrier frequency offsets introduce adjacent channel interference from other users' subcarriers, which results in performance degradation. In the proposed method, we compensate the carrier frequency offset in time domain and then eliminate MAI by using parallel interference cancellation in frequency domain. Simulation results show that the proposed method is effective in removing the MAI especially when the number of users are large and the MAI severely degrades the system performance.
Keywords
IFDMA; frequency offset; multiple access interference;
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