A Novel Interference Cancellation Approach for Interleaved OFDMA Uplink System

Ruiqin MIAO  Jun SUN  Lin GUI  Jian XIONG  

IEICE TRANSACTIONS on Communications   Vol.E92-B   No.11   pp.3432-3438
Publication Date: 2009/11/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.3432
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
carrier frequency offset (CFO),  interleaved orthogonal frequency division multiple access (OFDMA),  parallel interference cancellation(PIC),  minimum mean square error (MMSE),  

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In this paper, the issue of carrier frequency offset (CFO) compensation in interleaved orthogonal frequency division multiple access (OFDMA) uplink system is investigated. To mitigate the effect of multiple access interference (MAI) caused by CFOs of different users, a new parallel interference cancellation (PIC) compensation algorithm is proposed. This scheme uses minimum mean square error (MMSE) criterion to obtain the estimation of interference users, then circular convolutions are employed to restore MAI and compensate CFO. To tackle the complexity problem of circular convolutions, an efficient MAI restoration and cancellation method is developed. Simulations illustrate the good performance and low computational complexity of the proposed algorithm.