[1]徐彦青,王 进,孟庆功,等.I/Q不平衡OFDM系统基于噪声方差门限的 信道估计[J].南京理工大学学报(自然科学版),2015,39(03):317.
 Xu Yanqing,Wang Jin,Meng Qinggong,et al.Noise variance threshold-based channel estimator for OFDM system with I/Q imbalances[J].Journal of Nanjing University of Science and Technology,2015,39(03):317.
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I/Q不平衡OFDM系统基于噪声方差门限的 信道估计
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《南京理工大学学报》(自然科学版)[ISSN:1005-9830/CN:32-1397/N]

卷:
39卷
期数:
2015年03期
页码:
317
栏目:
出版日期:
2015-06-30

文章信息/Info

Title:
Noise variance threshold-based channel estimator for OFDM system with I/Q imbalances
作者:
徐彦青1王 进1孟庆功1未 元1束 锋123余 海1沈 悦1钱玉文1
1.南京理工大学 电子工程与光电技术学院,江苏 南京 210094; 2.东南大学 移动通信国家重点实验室,江苏 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,江苏 南京 210094
Author(s):
Xu Yanqing1Wang Jin1Meng Qinggong1Wei Yuan1Shu Feng123 Yu Hai1Shen Yue1Qian Yuwen1
1.School of Electronic Engineering and Optoelectronic Technology,NUST,Nanjing 210094,China; 2.National Mobile Communications Research Laboratory,Southeast University,Nanjing 210096,China; 3.Ministerial Key Laboratory of JGMT,NUST,Nanjing 210094,China
关键词:
同相/正交不平衡 正交频分复用 最小二乘信道估计 噪声方差 稀疏信道环境 频域 时域 压缩感知
Keywords:
in-phase and quadrature-phase imbalances orthogonal frequency division multiplexing least square channel estimator noise variance sparse environment frequency-domain time-domain compressed sensing
分类号:
TN929.5
摘要:
为了提高稀疏信道环境下同相/正交(I/Q)不平衡正交频分复用(OFDM)系统的性能,该文提出了一种低复杂度的门限时域最小二乘信道估计算法。该算法通过估计噪声方差确定合适的门限过滤信道响应采样点内的噪声以提高估计精度。仿真结果表明,该文算法估计精度与现有频域和时域最小二乘信道估计方法相比分别提升了6 dB、2 dB,逼近基于压缩感知的时域迭代收缩算法,且计算复杂度低于后者。
Abstract:
In order to improve the performance of orthogonal frequency division multiplexing(OFDM)system with in-phase and quadrature-phase(I/Q)imbalances in sparse environment,a threshold-based time-domain least square(TB-TD-LS)channel estimator is proposed with low complexity.In order to improve the accuracy of channel estimation,an approximate optimal threshold is determined according to noise variance to eliminate the noise in sampling points of channel response in the proposed estimator.The simulation result shows that the estimation accuracy of the TB-TD-LS channel estimator is improved 6 dB than that of a frequency-domain channel estimation algorithm,and is improved 2 dB than that of a time-domain channel estimation algorithm,and closes to that of a time-domain least square iterative shrinkage estimator based on compressed sensing.The computation complexity of the TB-TD-LS channel estimator is lower than that of the time-domain least square iterative shrinkage estimator based on compressed sensing.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2014-06-22 修回日期:2014-09-11
基金项目:国家自然科学基金(61271230; 61472190); 中央高校基本科研业务费专项资金(30920130122004); 东南大学移动通信国家重点实验室开放课题(2013D02)
作者简介:徐彦青(1990-),男,硕士生,主要研究方向:OFDM系统关键技术,E-mail:xu-yanqing@qq.com; 通讯作者:束锋(1973-),男,博士,研究员,主要研究方向:新一代无线通信基本理论与关键技术,E-mail:shufeng@njust.edu.cn。
引文格式:徐彦青,王进,孟庆功,等.I/Q不平衡OFDM系统基于噪声方差门限的信道估计[J].南京理工大学学报,2015,39(3):317-322.
投稿网址:http://zrxuebao.njust.edu.cn
更新日期/Last Update: 2015-06-30