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Performance Analysis of a LowComplexity CFO Compensation Scheme for OFDMA Uplink
ChaoYuan HSU WenRong WU
Publication
IEICE TRANSACTIONS on Communications
Vol.E92B
No.3
pp.954963 Publication Date: 2009/03/01
Online ISSN: 17451345
DOI: 10.1587/transcom.E92.B.954
Print ISSN: 09168516 Type of Manuscript: PAPER Category: Wireless Communication Technologies Keyword: orthogonal frequencydivision multiple access (OFDMA), carrier frequency offset (CFO), intercarrier interference (ICI),
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Summary:
Similar to orthogonal frequencydivision multiplexing (OFDM) systems, orthogonal frequencydivision multiple access (OFDMA) is vulnerable to carrier frequency offset (CFO). Since the CFO of each user is different, CFO compensation in OFDMA uplink is much more involved than that in OFDM systems. It has been shown that the zeroforcing (ZF) compensation method is a simple yet effective remedy; however, it requires the inversion of a large matrix and the computational complexity can be very high. Recently, we have developed a lowcomplexity iterative method to alleviate this problem. In this paper, we consider the theoretical aspect of the algorithm. We specifically analyze the output signaltointerferenceplusnoiseratio (SINR) of the algorithm. Two approaches are used for the analysis; one is simple but approximated, and the other is complicated but exact. The convergence problem is also discussed. In addition to the analysis, we propose a precompensation (PC) method enhancing the performance of the algorithm. Simulations show that our analysis is accurate and the PC method is effective.

