[1] Shu Feng, , Tong Juanjuan, et al. High-performance channel estimation and compensation schemefor OFDM receivers with IQ imbalances [J]. Journal of Southeast University (English Edition), 2014, 30 (4): 416-421. [doi:10.3969/j.issn.1003-7985.2014.04.003]

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High-performance channel estimation and compensation schemefor OFDM receivers with IQ imbalances()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

30

Issue:

2014 4

Page:

416-421

Research Field:

Information and Communication Engineering

Publishing date:

2014-12-31

Info

Title:

High-performance channel estimation and compensation schemefor OFDM receivers with IQ imbalances

Author(s):

Shu Feng¹;  2;  3;  Tong Juanjuan¹;  Li Jun¹;  Wang Jin¹;  Gu Chen¹;  Lu Jinhui¹

¹School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
²National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China
³Ministerial Key Laboratory of JGMT, Nanjing University of Science and Technology, Nanjing 210094, China

Keywords:

inphase and quadrature(IQ)imbalance;  equalizer;  channel estimation;  time domain;  frequency domain;  least square

PACS:

TN929.5

DOI:

10.3969/j.issn.1003-7985.2014.04.003

Abstract:

A pilot pattern across two orthogonal frequency division multiplexing(OFDM)symbols with a special structure is designed for the channel estimation of OFDM systems with inphase and quadrature(IQ)imbalances at the receiver. A high-efficiency time-domain(TD)least square(LS)channel estimator and a low-complexity frequency-domain Gaussian elimination(GE)equalizer are proposed to eliminate IQ distortion. The former estimator can significantly suppress channel noise by a factor N/(L+1)over the existing frequency-domain(FD)LS, where N and L+1 are the total number of subcarriers and the length of cyclic prefix, and the proposed GE requires only 2N complex multiplications per OFDM symbol. Simulation results show that by exploiting the TD property of the channel, the proposed TD-LS channel estimator obtains a significant signal-to-noise ratio gain over the existing FD-LS one, whereas the proposed low-complexity GE compensation achieves the same bit error rate(BER)performance as the existing LS one.

References:

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Memo

Memo:

Biography: Shu Feng(1973—), male, doctor, professor, shufeng@njust.edu.cn.
Foundation items: The Open Research Fund of National Mobile Communications Research Laboratory of Southeast University(No.2013D02), the Fundamental Research Funds for the Central Universities(No.30920130122004), the National Natural Science Foundation of China(No.61271230, 61472190).
Citation: Shu Feng, Tong Juanjuan, Li Jun, et al.High-performance channel estimation and compensation scheme for OFDM receivers with IQ imbalances[J].Journal of Southeast University(English Edition), 2014, 30(4):416-421.[doi:10.3969/j.issn.1003-7985.2014.04.003]

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