双选择性衰落信道下的改进型频域判决反馈均衡

冯昂; 张莹; 邓科

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双选择性衰落信道下的改进型频域判决反馈均衡

更新时间：2025-07-09

- 双选择性衰落信道下的改进型频域判决反馈均衡
- A Modified Frequency-Domain Decision-Feedback Equalization for Doubly-Selective Fading Channels
- 西安交通大学学报 2010年44卷第10期页码：67-71
- 作者机构：
  
  西安交通大学智能网络与网络安全教育部重点实验室,西安,710049
- 作者简介：
- 基金信息：
  
  : 2010-03-08. 作者简介: 冯昂(1979-),男,博士生;邓科(联系人),男,副教授. 基金项目: 国家自然科学基金资助项目(60772095,60971113);教育部高等学校博士学科点专项科研基金资助项目(200806980020)
- DOI：
  中图分类号： TN911.7
- 网络首发：2010-10-10，
  
  纸质出版：2010
- 稿件说明：
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冯昂, 张莹, 邓科. 双选择性衰落信道下的改进型频域判决反馈均衡[J]. 西安交通大学学报, 2010,44(10):67-71.

A Modified Frequency-Domain Decision-Feedback Equalization for Doubly-Selective Fading Channels[J]. 2010, 44(10): 67-71.
冯昂, 张莹, 邓科. 双选择性衰落信道下的改进型频域判决反馈均衡[J]. 西安交通大学学报, 2010,44(10):67-71. DOI：

A Modified Frequency-Domain Decision-Feedback Equalization for Doubly-Selective Fading Channels[J]. 2010, 44(10): 67-71. DOI：

摘要

针对双选择性衰落信道下传统频域判决反馈均衡(FD-DFE)会遭受严重性能损失的问题

提出一种新的重叠保留频域判决反馈均衡(OLS-FD-DFE)算法.首先

在设计前馈滤波器时

通过对其取值范围做出约束

使得有效抽头只在指定区间内存在非0值.然后

利用重叠保留法

将数据块分割为多个子块再进行频域均衡

如果子块长度小于信道相干时宽

只要在均衡每个子块时依据信道响应更新滤波器系数

就可以明显提高对信道时变的容忍度.仿真结果表明

当移动速度为100 km/h时

OLS-FD-DFE算法在信噪比20 dB处的误码率可以达到2×10

-5

而相同情况下FD-DFE算法的误码率只能达到8×10

-4

Abstract

A novel overlap-save frequency-domain decision-feedback equalizer(OLS-FD-DFE)is proposed to improve the problem that the conventional frequency-domain decision-feedback equalizer(FD-DFE)suffers from severe performance detriment in doubly-selective fading channels. The feedforward filter is designed with constraint on its time-domain values such that the effective taps have non-zero values only in a predefined range. Then

the overlap-save method is applied to divide the original block-wise convolution into several subblock-wise convolutions. When the length of subblock is less than the coherence time of the channel

the tolerance to the channel time-variation can be significantly improved

as long as the filter coefficients are updated according to the channel response. Simulation results show that if the mobile moves at the speed of 100 km/h

OLS-FD

-DFE achieves 2×10

-5

bit error rate when the signal-to-noise ratio is 20 dB

while FD-DFE achieves only 8×10

-4

bit error rate in the same scenario.

关键词

Keywords

references

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