扩展OFDM系统的信道估计与符号检测

doi:10.11930/j.issn.1004-9649.2014.12.117.3

中国电力 ›› 2014, Vol. 47 ›› Issue (12): 117-120.DOI: 10.11930/j.issn.1004-9649.2014.12.117.3

扩展OFDM系统的信道估计与符号检测

李兵

广西电网公司电力调度控制中心,广西南宁 530023

收稿日期:2014-06-04 出版日期:2014-12-18 发布日期:2015-12-08
作者简介:李兵（1982—）,男,湖南湘潭人,工程师,从事电力系统通信运行维护工作。E-mail: libing5559@163.com

Channel Estimation and Symbol Detection for Spread OFDM System

LI Bing

Guangxi Power Grid Dispatching Control Center, Nanning 530023, China

Received:2014-06-04 Online:2014-12-18 Published:2015-12-08

摘要/Abstract

摘要： 利用频率分集可以有效地改善符号检测性能,而传统的正交频分复用（OFDM）系统中没有实现频率分集增益。针对频率选择性信道设计块扩展OFDM系统,在发端对信息块进行扩展变换,并给出了基于最小二乘（least squares,LS）收端的信道估计和基于最小均方误差（minimum mean squares error,MMSE）的符号检测方案。仿真结果验证了信道估计与符号检测方案的有效性,表明扩展变换有效地提高OFDM系统的符号检测性能。

关键词: 正交频分复用, 扩展变换, 频率选择性信道, 信道估计, 符号检测

Abstract: Frequency diversity can be exploited for performance improvement of symbol detection. However, there is no frequency diversity gain in traditional OFDM system. Therefore, a block spread OFDM system was designed for the frequency selective fading channel, in which a spread transform on the information block was performed at the transmitter. Moreover, a least squares (LS) based channel estimation and minimum mean squares error(MMSE) based symbol detection scheme were proposed for the receiver. Simulation results corroborate the validity of the channel estimation and symbol detection scheme, and the symbol detection performance is effectively improved by the spread transform.

Key words: orthogonal frequency division multiplexing(OFDM), spread transform, frequency selective channel, channel estimation, symbol detection

中图分类号:

TM734

李兵. 扩展OFDM系统的信道估计与符号检测[J]. 中国电力, 2014, 47(12): 117-120.

LI Bing. Channel Estimation and Symbol Detection for Spread OFDM System[J]. Electric Power, 2014, 47(12): 117-120.

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https://www.electricpower.com.cn/CN/Y2014/V47/I12/117

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扩展OFDM系统的信道估计与符号检测

Channel Estimation and Symbol Detection for Spread OFDM System

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扩展OFDM系统的信道估计与符号检测

Channel Estimation and Symbol Detection for Spread OFDM System

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