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J4  2010, Vol. 44 Issue (4): 681-686    DOI: 10.3785/j.issn.1008-973X.2010.04.010
电子、通信与自动控制技术     
基于可变抽头长度的IEEE 802.11n信道估计方法
刘云峰1, 陈淑敏2, 王洋1, 彭曦1, 徐元欣1
1.浙江大学 信息与通信工程研究所,浙江 杭州 310027; 2.浙江理工大学 信息电子学院,浙江 杭州 310018
Channel estimation methods for IEEE 802.11n based on
variable tap length
LIU Yunfeng1, CHEN Shumin2, WANG Yang1, PENG Xi1, XU Yuanxin1
1. Institute of Information and Communication Engineering, Zhejiang University, Hangzhou 310027, China;
2. Faculty of Informatics and Electronics, Zhejiang SciTech University, Hangzhou 310018, China
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摘要:

为了提高在不同信道冲激响应长度下无线局域网传输性能,提出一类基于可变抽头长度的MIMOOFDM信道估计方法.该类方法利用训练序列对信道进行估计,动态调整抽头长度及位置,基于最小二乘原理完成一个较大点数的信道估计,估计噪声功率并确定噪声门限.根据IEEE 802.11n无线局域网信道模型中多群集效应,使用消去策略确定需要的抽头长度,在满足门限后对系统进行抽头长度更新后的最小二乘估计.分析及仿真结果表明,该类方法与传统MIMOOFDM信道估计方法相比,节省了系统资源,估计性能有显著提高,尤其适用于较高信噪比及较大星座图调制的MIMOOFDM系统.

Abstract:

A method of MIMOOFDM channel estimation based on variable channel impulse response length was presented to improve the WLAN transmission performance for different channel environment. A least squares channel estimation method was investigated with training sequences by adjusting dynamically the tap length and position. Channel estimation with large points was implemented by using the least squares principle to estimate the noise power and determine the noise threshold. Rolloff strategy was applied for the tap length decision, which was based on IEEE 802.11n TGn channel multiple cluster models. Least squares channel estimation using updated tap length was implemented when the threshold was satisfied. Analysis and simulation show that, compared with the traditional MIMOOFDM channel estimation methods, the enhanced method not only saves the system resources, but also improves the estimation performance, especially for the MIMOOFDM systems with high SNR and large constellation.

出版日期: 2010-05-14
:  TN92  
通讯作者: 徐元欣,男,副教授.     E-mail: xuyx@zju.edu.cn
作者简介: 刘云峰(1985—),男,河南商丘人,硕士生,从事OFDM信道估计研究. E-mail: 001945aaa@zju.edu.cn
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引用本文:

刘云峰, 陈淑敏, 王洋, 彭曦, 徐元欣. 基于可变抽头长度的IEEE 802.11n信道估计方法[J]. J4, 2010, 44(4): 681-686.

LIU Yun-Feng, CHEN Chu-Min, WANG Xiang, BANG Xi, XU Yuan-Xin. Channel estimation methods for IEEE 802.11n based on
variable tap length. J4, 2010, 44(4): 681-686.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2010.04.010        http://www.zjujournals.com/eng/CN/Y2010/V44/I4/681

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