Analysis of Iterative ICI Cancellation Algorithm for Uplink OFDMA Systems with Carrier-Frequency Offset(Wireless Communication Technologies)
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概要
- 論文の詳細を見る
In orthogonal frequency-division multiplex access (OFDMA) uplink, the carrier-frequency offsets (CFOs) between the multiple transmitters and the receiver introduce inter-carrier interference (ICI) and severely degrade the performance. In this paper, based on the perfect estimation of each user's CFO, we propose two low-complexity iterative algorithms to cancel ICI due to CFOs, which are denoted as the basic algorithm and the improved algorithm with decision-feedback equalization (DFE), respectively. For the basic one, two theorems are proposed that yield a sufficient condition for the convergence of iterations. Moreover, the interference-power-evolution (IPE) charts are proposed to evaluate the convergence behavior of this interference cancellation algorithm. Motivated by the IPE chart, the procedure of DFE is introduced into the iterations, which is the basic idea of the improved algorithm. For this improved algorithm, the error-propagation effect are analyzed and suppressed by an efficient stopping criterion. From IPE charts and simulation results, it can be easily observedthat the basic algorithm has the same capability of ICI cancellation as the linear optimal minimum mean square error (MMSE) method, but offers lower complexity, while the improved algorithm with DFE outperforms the MMSE method in terms of the bit-error rate (BER) performance.
- 社団法人電子情報通信学会の論文
- 2007-07-01
著者
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Chen Xiang
National Laboratory For Information Science And Technology Tsinghua University
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WANG Jing
National Laboratory for Information Science and Technology, Tsinghua University
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Wang Jing
Tsinghua Univ. Beijing Chn
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Wang Jing
National Laboratory For Information Science And Technology Tsinghua University
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Chen Xiang
Tsinghua Univ. Beijing Chn
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Zhou Shidong
Tsinghua Univ. Beijing Chn
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Zhou Shidong
The State Key Lab. On Microwave And Digital Communication Tsinghua University
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Zhou Shidong
National Laboratory For Information Science And Technology Tsinghua University
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Huang Min
National Laboratory For Information Science And Technology Tsinghua University
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Wang Jing
State Key Laboratory On Microwave And Digital Communications Tsinghua National Laboratory For Inform
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Wang Jing
State Key Laboratory On Microwave And Digital Communications Tsinghua National Laboratory For Inform
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Wang Jing
National Key Laboratory Of Crop Genetic Improvement National Center Of Crop Molecular Breeding Huazhong Agricultural University
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