Open AccessConstrained TST MUSIC for joint spatio‐temporal channel parameter estimation in DS/CDMA systems
Author(s) -
Lin JenDer,
Fang WenHsien,
Chen JiunnTsair
Publication year - 2005
Publication title -
wireless communications and mobile computing
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.42
H-Index - 64
eISSN - 1530-8677
pISSN - 1530-8669
DOI - 10.1002/wcm.281
Subject(s) - computer science , algorithm , beamforming , partition (number theory) , code division multiple access , channel (broadcasting) , computational complexity theory , speech recognition , telecommunications , mathematics , combinatorics
In this paper, we present a blind and robust algorithm to jointly estimate the directions of arrival (DOAs) and propagation delays in DS/CDMA systems. The rationale of the proposed approach is a hybrid of one‐dimensional (1‐D) mu ltiple si gnal c lassification (MUSIC) algorithms and constrained spatial/temporal filtering processes. As previously addressed TST MUSIC, two temporal (T)‐MUSIC and one spatial (S)‐MUSIC are employed alternatively in the proposed algorithm to estimate the group delays and the DOAs respectively. However, by utilizing the structure of the data model, no training sequences are required. Furthermore, a constrained temporal filtering process and a constrained spatial beamforming process, which minimize the filtered noise power under a set of judiciously chosen linear constraints, are now employed after the T‐MUSIC and S‐MUSIC respectively. These filtering processes aim to effectively partition the incoming rays and to be robust against the propagation errors in the tree‐structured estimation scheme so that the overall performance can be enhanced. Also, the incoming rays are grouped, isolated and estimated, and the pairing of the estimated delays and DOAs is automatically achieved without extra computational overhead. Furnished simulations show that the new approach can exhibit satisfactory performance with low complexity compared with previous works. Copyright © 2005 John Wiley & Sons, Ltd.