A New Equalizer in Doubly-Selective Channels for TDS-OFDM

被引:11
|
作者
Hao, Jinxing [1 ,2 ,3 ]
Wang, Jintao [1 ,2 ,3 ]
Wu, Youshou [1 ]
机构
[1] Tsinghua Univ, Dept Elect Engn, Beijing 100084, Peoples R China
[2] Tsinghua Univ, Tsinghua Natl Lab Informat Sci & Technol, Beijing 100084, Peoples R China
[3] Shenzhen City Key Lab Digital TV Syst, Shenzhen 518057, Peoples R China
基金
美国国家科学基金会;
关键词
Intercarrier interference (ICI) compression; time domain synchronous-orthogonal frequency-division multiplexing (TDS-OFDM); fast suboptimal-minimum mean square error (FAST-MMSE) equalization; WIRELESS MOBILE OFDM; INTERCARRIER INTERFERENCE; FADING CHANNELS; CYCLIC PREFIX; SYSTEMS; ICI; ALGORITHM;
D O I
10.1109/TBC.2014.2378611
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Various factors contribute to the intercarrier interference (ICI) in orthogonal frequency-division multiplexing (OFDM), which violates the orthogonality among subcarriers and greatly degrades the performance. Traditional ICI compensation methods incorporate iterative estimation and cancelation for pilot subcarriers, bearing too much complexity and reducing the spectral efficiency. In this paper, a novel channel equalization method is proposed for time domain synchronous-orthogonal frequency-division multiplexing (TDS-OFDM), where fast and accurate channel estimation is achieved by utilizing the padded pseudo-noise sequence in consecutive blocks. The new equalizer refers to fast suboptimal-minimum mean square error structure, other than traditional overlap-add structure, inspired by the fact that linear convolution structure is better preserved than circular convolution structure in TDS-OFDM under time-varying channels. With the approximation of linear time-varying channel, the proposed equalizer achieves considerable performance with low complexity (linear) and no additional spectral overhead.
引用
收藏
页码:91 / 97
页数:7
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