基于FFT的快速DOA估计及其在DS-CDMA接收机中的应用

北京邮电大学学报 ›› 2002, Vol. 25 ›› Issue (4): 79-83.

基于FFT的快速DOA估计及其在DS-CDMA接收机中的应用

翟明岳¹, 刘元安¹, 于平²

1.北京邮电大学电信工程学院,北京 100876;
2.胜利油田设计院信息中心, 东营 250013

收稿日期:2001-10-16 出版日期:2002-11-10
作者简介: 翟明岳(1970—),男,博士研究生。
基金资助:

Rapid DOA Estimating Algorithm Based on FFT and Its Application to DS-CDMA Receiver

ZHAI Ming-yue¹, LIU Yuan-an¹, YU Ping²

1.Telecommunication Engineering School, Beijing University of Posts and Telecommunications, Beijing 100876, China;
2.Information Center of Shengli Oilfield, Hebei 250013, China

Received:2001-10-16 Online:2002-11-10
Supported by:

摘要/Abstract

摘要： CDMA信号在解扩之后,其中解扩用户的信号强度会很大,利用这一特性,把FFT方法引入到阵列信号的DOA估计中,并与MUSIC方法做了仿真比较,表明基于FFT的DOA快速估计是可行的。利用DOA信息,初始化自适应波束成形的权值。仿真结果表明,LMS算法的收敛速度将极大地加快,误差将大大降低。

关键词: DOA, FFT, LMS, 智能天线

Abstract: After CDMA signals are despreaded, the signal of thedesired user is stronger than others. Based on this property, FFT can be appliedto DOA estimations in array signals. Comparison with MUSIC algorithm is performed, and the results show FFT is applicable in DOA estimations. DOA information can be used in initializing the weights of the adaptive beamforming. Simulationsshow that LMS convergence rate is speeded and the error is greatly reduced.

Key words: DOA, FFT, LMS, smart antenna

中图分类号:

TN929.533

翟明岳, 刘元安, 于平. 基于FFT的快速DOA估计及其在DS-CDMA接收机中的应用[J]. 北京邮电大学学报, 2002, 25(4): 79-83.

ZHAI Ming-yue, LIU Yuan-an, YU Ping. Rapid DOA Estimating Algorithm Based on FFT and Its Application to DS-CDMA Receiver[J]. JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM, 2002, 25(4): 79-83.