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OFDM系统中窄带干扰下的联合信道和噪声估计

发表时间:2010-05-31  浏览量:1414  下载量:678
全部作者: 易友文,江涛,屈代明
作者单位: 华中科技大学电子与信息工程系
摘 要: 为抑制基于正交频分复用技术(orthogonal frequency division multiplexing,OFDM)的无线通信系统中的窄带干扰,提出一种联合信道估计和噪声估计的算法,利用解码结果改进信道和噪声功率的估计精度,同时提高解码性能,降低误码率(bit error ratio,BER)。该算法能达到较高的噪声功率估计精度,并很好地逼近最佳误码率性能。同时,提出的算法对于干扰的功率和带宽变化都有很好的鲁棒性。为评估干扰估计和信道估计算法的性能,也分别推导了噪声估计和信道估计的Cramér�Rao界(Cramér�Rao Bounds,CRB)。仿真结果表明,提出的估计算法的均方误差能够达到各自的CRB.
关 键 词: 通信技术;窄带干扰;联合信道和噪声估计;正交频分复用
Title: Joint channel and noise estimation in the present of narrowband interference for OFDM systems
Author: YI Youwen, JIANG Tao, QU Daiming
Organization: Department of Electronics and Information Engineering, Huazhong University of Science and Technology
Abstract: In this paper, an iterative algorithm is proposed that combines channel and noise estimation with decoding to combat unknown narrowband interference for orthogonal frequency division multiplexing (OFDM)�based communication systems. Simulation results show that the proposed iterative schemes effectively achieve a quasi�optimal bit error ratio (BER) performance with low complexity. It is also shown that the proposed schemes are robust with respect to power and bandwidth of the interference. Moreover, the Cramér�Rao Bounds (CRB) for mean square errors of channel and noise estimations are derived, and it is validated that the CRBs can be achieved via the proposed schemes with very few iteration numbers.
Key words: communication techniques; narrowband interference; joint channel and noise estimation; orthogonal frequency division multiplexing
发表期数: 2010年5月第10期
引用格式: 易友文,江涛,屈代明. OFDM系统中窄带干扰下的联合信道和噪声估计[J]. 中国科技论文在线精品论文,2010,3(10):980-988.
 
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