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[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()
接收IQ不平衡OFDM系统的高性能信道估计和补偿方案
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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
接收IQ不平衡OFDM系统的高性能信道估计和补偿方案
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
束锋1;  2;  3;  童娟娟1;  李隽1;  王进1;  顾晨1;  陆锦辉1
1南京理工大学电子工程与光电技术学院, 南京210094; 2东南大学移动通信国家重点实验室, 南京210096; 3南京理工大学近程高速目标探测技术国防重点学科实验室, 南京210094
Keywords:
inphase and quadrature(IQ)imbalance;  equalizer;  channel estimation;  time domain;  frequency domain;  least square
IQ不平衡;  均衡器;  信道估计;  时域;  频域;  最小二乘
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.
针对接收IQ不平衡的OFDM系统, 设计了横跨2个OFDM符号的特殊训练结构.提出了一种高效的时域最小二乘(TD-LS)信道估计和一种低复杂度的频域高斯消元补偿算法来消除IQ失真.前者与传统的频域LS算法相比, 信道估计噪声的影响降低了N/(L+1)倍, 其中N为子载波总数, L+1为循环前缀长度;后者实现复杂度低, 每个OFDM符号仅需要2N次复数乘法.仿真结果表明:由于充分挖掘了信道参数的时域特性, 提出的TD-LS信道估计算法与传统的FD-LS算法相比获得了可观的信噪比增益;提出的低复杂度的GE补偿算法能够获得与基于LS的频域补偿方案几乎相同的误码性能.

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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]
Last Update: 2014-12-20