A Novel ICI Cancellation Algorithm Based on Channel Segmentationcascade in OFDM System

Journal of Shanghai Jiaotong University ›› 2011, Vol. 45 ›› Issue (03): 308-0312.

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A Novel ICI Cancellation Algorithm Based on Channel Segmentationcascade in OFDM System

XU Xing-Hui, HE Chen

(School of Electronic, Information and Electrical Engineering, Shanghai Jiaotong University, Shanghai 200240, China)

Received:2010-03-21 Online:2011-03-30 Published:2011-03-30

Abstract

Abstract: For Orthogonal Frequency Division Multiplexing (OFDM) wireless systems with high frequency, deficiencies caused by Doppler frequency offset and the carrier phase noise are much higher，which will introduce InterCarrier Interference (ICI) and degrade the performance. Using channel segmentation，an equivalent method was presented in this paper，which transfers linear timevariant channel into the cascading of timeinvariant channel and timevariant channel with no delay. Then onedimensional equalization can be achieved at the receiver to suppress ICI, avoiding calculating the frequency domain channel response matrix and its inverse matrix. The analysis and simulation results show that, the proposed algorithm can effectively reduce the complexity to O(N) with almost no performance loss, compared to the existing low complexity MMSE.

Key words: orthogonal frequency division multiplexing(OFDM), intercarrier interference(ICI), linear timevariant channel, frequencydomain equalization, channel segmentationcascade (CSC)

CLC Number:

TN911.4

XU Xing-Hui, HE Chen. A Novel ICI Cancellation Algorithm Based on Channel Segmentationcascade in OFDM System[J]. Journal of Shanghai Jiaotong University, 2011, 45(03): 308-0312.

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[1]	DU Wen, JIANG Ling-Ge, HE Chen. An Algorithm for Phase Noise Mitigation in High-Frequency OFDM [J]. Journal of Shanghai Jiaotong University, 2011, 45(07): 1058-1062.
[2]	GUO Yi, LIU Gang, GE Jian-hua, ZHANG Wu-jun. A Novel Time and Frequency Synchronization Scheme for Orthogonal Frequency Division Multiplexing Systems [J]. Journal of Shanghai Jiaotong University, 2008, 42(10): 1754-1757.

A Novel ICI Cancellation Algorithm Based on Channel Segmentationcascade in OFDM System

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