Fine Frequency Synchronization in the Uplink of Multiuser OFDM Systems

被引：4
作者：
Haering, Lars [1 ]
Bieder, Stefan [2 ]
Czylwik, Andreas [1 ]
机构：
[1] Univ Duisburg Essen, Dept Commun Syst, D-47057 Duisburg, Germany
[2] Sennheiser Electron GmbH & Co KG, Engn Inspect Syst ENI, D-31303 Burgdorf, Germany
来源：
IEEE TRANSACTIONS ON COMMUNICATIONS | 2009年 / 57卷 / 12期
关键词：
Carrier frequency offset; sampling frequency offset; uplink; multiuser; OFDM; CHANNEL ESTIMATION; OFFSET; ESTIMATOR; TIME;
D O I：
10.1109/TCOMM.2009.12.080305
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
This contribution considers the estimation and compensation of residual multiple carrier frequency offsets (CFOs) and sampling frequency offsets (SFOs) in the uplink of multiuser OFDM systems. Based on the observation of a user-dependent phase rotation, an approximate maximum-likelihood (ML) estimator is proposed in order to estimate the CFOs and SFOs and to track the phase in a post-synchronization step. By using a Taylor approximation, the estimation complexity is reduced. Biterror-ratio (BER) simulations show that the system performance degradation due to (small) frequency mismatches is negligible if the proposed method is applied.
引用
收藏
页码：3743 / 3752
页数：10
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