On the ICI Mitigation in OFDM Systems by Using the Segment-Based QR Decomposition

• WANG Yung-Yi

  Department of Electrical Engineering, Chang Gung University

• HU Hsu-Jah

  Department of Electrical Engineering, Chang Gung University

• CHEN Yen-Lin

  Department of Electrical Engineering, Chang Gung University

抄録

In this study, a precoding scheme based on QR-decomposition is proposed for mitigating the inter-carrier-interference (ICI) in orthogonal-frequency-division-multiplexing (OFDM) systems. The proposed approach first subjects the ICI matrix to QR decomposition so that the ICI effect is transformed into its spectrally causal equivalent. With this causality, the precoding can then be conducted based on the resultant spectrally causal matrix. In addition, by using the stationary property of the ICI factors, in conjunction with zero padding, we implement the QR-based precoding in a segmentation manner which can significantly alleviate the computational complexity imposed by QR decomposition while eliminating ICI within each segment. This study also analyzes the residue interference power induced by the segmentation. The residue interference power is then accordingly used to determine the order of zero padding. Computer simulations support the validity of the proposed approach.

収録刊行物

• IEICE Transactions on Communications

  IEICE Transactions on Communications E95.B (5), 1878-1881, 2012

  一般社団法人 電子情報通信学会

キーワード

• OFDM
• CFO estimation
• Inter carrier interference

詳細情報

• CRID: 1390282679351470720
• NII論文ID: 10030940430
• NII論文ID: 130002119282
• NII書誌ID: AA10826261
• DOI: 10.1587/transcom.e95.b.1878
• BIBCODE: 2012IEITC..95.1878W
• ISSN: 17451345
• ISSN: 09168516
• Web Site: https://www.jstage.jst.go.jp/article/transcom/E95.B/5/E95.B_5_1878/_pdf
• 本文言語コード: en
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