【摘 要】
：
A residual carrier frequency offset (CFO) estimation scheme is proposed for the uplink of orthogonal frequency division multiple access (OFDMA) systems.Multiple
【机 构】
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State Key Laboratory on Microwave and Digital Communications Tsinghua National Laboratory for Inform
【基金项目】
：
the National High Technology Research and Development Programme of China;国家重点基础研究发展规划(973计划);the Fundamental Research Funds for the Central Universities in China;China Postdoctoral Science Foundation
论文部分内容阅读
A residual carrier frequency offset (CFO) estimation scheme is proposed for the uplink of orthogonal frequency division multiple access (OFDMA) systems.Multiple access interference caused by CFOs in the uplink is investigated,as it severely affects the performance of a classical maximum likelihood (ML) frequency estimator.By the use of the estimated CFOs of the active users,the linear maximum mean square error (LMMSE)equalization is performed before the ML frequency estimator for the interference cancellation,which can help to sufficiently improve the estimation accuracy for the residual CFO of the incoming user.Analysis and simulations show that the modified ML estimator provides a tradeoff between estimation accuracy and computational complexity caused by the LMMSE interference cancellation,and the proposed method allows OFDMA systems flexibly allocating subcarriers to users.
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