A Modified Frequency-Domain Decision-Feedback Equalization for Doubly-Selective Fading Channels

您当前的位置：

首页 >

文章列表页 >

A Modified Frequency-Domain Decision-Feedback Equalization for Doubly-Selective Fading Channels

更新时间：2025-07-09

- A Modified Frequency-Domain Decision-Feedback Equalization for Doubly-Selective Fading Channels
- Vol. 44, Issue 10, Pages: 67-71(2010)
- 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：
- DOI：
  CLC： TN911.7
- Online First：10 October 2010，
  
  Published：2010
- 稿件说明：
移动端阅览
A Modified Frequency-Domain Decision-Feedback Equalization for Doubly-Selective Fading Channels[J]. 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

FALCONER D, ARIYAVISITAKUL S L, BENYAMIN-SEEYAR A, et al. Frequency domain equalization for single-carrier broadband wireless systems [J]. IEEE Communications Magazine, 2002, 40(4): 58-66.

武林俊, 朱世华, 冯兴乐. 降低功率控制下正交频分复用系统的峰均比[J]. 西安交通大学学报, 2005, 39(8): 859-862.

WU Linjun, ZHU Shihua, FENG Xingle. Reducing peak-to-average power ratio for orthogonal frequency division multiplexing systems under low power control[J]. Journal of Xi'an Jiaotong University, 2005, 39(8):859-862.

侯永宏, 杨刚, 王安国, 等. 时域同步正交频分复用系统的频偏估计[J]. 西安交通大学学报, 2009,43(12):101-105.

HOU Yonggui, YANG Gang, WANG Anguo, et al. Frequency deviation estimation for TDS-OFDM system [J]. Journal of Xi'an Jiaotong University, 2009,43(12):101-105.

SCHNITER P, LIU Hong. Iterative frequency-domain equalization for single-carrier systems in doubly-dispersive channels [C]∥Proceedings of Asilomar Conference on Signals, Systems, and Computers. Piscataway, NJ, USA: IEEE, 2004:126-130.

AHMED S, SELLATHURAI M, LAMBOTHARAN S, et al. Low-complexity iterative method of equalization for single carrier with cyclic prefix in doubly selective channels[J]. IEEE Signal Processing Letters, 2006, 13(1):5-8.

KAMBARA K, NISHIMOTO H, NISHIMURA T, et al. Subblock processing in MMSE-FDE under fast fading environments [J]. IEEE Journal on Selected Areas in Communications, 2008, 26(2):359-365.

HAYASHI K, SAKAI H. Interference cancellation schemes for single-carrier block transmission with insufficient cyclic prefix [EB/OL].[2008-01-04]. http:∥www.hindawi.com/journals/wcn/2008/130747.abs.html.

GUSMAO A, TORRES P, DINIS R, et al. A reduced-CP approach to SC/FDE block transmission for broadband wireless communications [J]. IEEE Transactions on Communications, 2007, 55(4):801-809.

LI Ye, MCLAUGHLIN S, CRUICKSHANK D G M. Bandwidth efficient single carrier systems with frequency domain equalisation [J]. Electronics Letters, 2005, 41(15):857-858.

AI-DHAHIR N, CIOFFI J M. Efficiently computed reduced-parameter input-aided MMSE equalizers for ML detection: a unified approach [J]. IEEE Transactions on Information Theory, 1996, 42(3):903-915.

AI-DHAHIR N, CIOFFI J M. MMSE decision-feedback equalizers: finite-length results [J]. IEEE Transactions on Information Theory, 1995, 41(4):961-975.

OPPENHEIM A V, SCHAFER R W, BUCK J R. Discrete-time signal processing [M]. Upper Siddle River, NJ, USA: Prentice-Hall Inc., 1999.

Views

下载量

CSCD

Alert me when the article has been cited

提交

Tools

Publicity Resources

Knowledge Graph Representation Learning Driven by Semantic Discrimination and Subgraph Integration

Numerical Simulation of Heat-Moisture Barrier Performance of a Horizontal Air Curtain in Cold Storage

Windage Loss and Flow Characteristics in Impeller Back Gaps of sCO2 Radial Inflow Turbines

Bi-Level Multi-Obj ective Optimization of a Wind-Solar Coupled Hydrogen Production System Based on the Synergy of Hybrid Electrolyzer Arrays

Turbulent Kinetic Energy Dissipation Mechanism of Supercritical Carbon Dioxide Leakage Flow in a Scallop Bionic Seal Cavity

Related Author

No data

Related Institution

No data

⁰