Low-complexity adaptive array for DS/CDMA code acquisition

Hua Lung Yang*, Wen-Rong Wu

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Conventional array code acquisition uses a correlator bank and an adaptive beamformer. However, its performance degrades significantly while multiple access interference (MAI) presents. In this paper, we propose a low-complexity adaptive filtering scheme to solve the problem. The proposed scheme comprises two adaptive filters, an adaptive spatial and an adaptive temporal filter. With a special structure, the spatial filter can act as a beamformer suppressing interference, while the temporal filter can act as a code-delay estimator. A criterion is proposed for minimization such that these filters can simultaneously adjusted by a constrained least-mean-square (LMS) algorithm. The proposed system is simple and it can acquire both the code-delay and direction-of-arrival (DoA) of the desired user. The performance as well as the convergence behavior of the proposed algorithm are analyzed analytically. Closed-form expressions for optimum filters and steady-state mean-squared errors (MSE) are derived. Computer simulations show that the mean acquisition time of the proposed system is much shorter than that of the conventional system.

Original languageEnglish
Title of host publicationISCAS 2006
Subtitle of host publication2006 IEEE International Symposium on Circuits and Systems, Proceedings
Pages193-196
Number of pages4
DOIs
StatePublished - 1 Dec 2006
EventISCAS 2006: 2006 IEEE International Symposium on Circuits and Systems - Kos, Greece
Duration: 21 May 200624 May 2006

Publication series

NameProceedings - IEEE International Symposium on Circuits and Systems
ISSN (Print)0271-4310

Conference

ConferenceISCAS 2006: 2006 IEEE International Symposium on Circuits and Systems
CountryGreece
CityKos
Period21/05/0624/05/06

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    Yang, H. L., & Wu, W-R. (2006). Low-complexity adaptive array for DS/CDMA code acquisition. In ISCAS 2006: 2006 IEEE International Symposium on Circuits and Systems, Proceedings (pp. 193-196). [1692555] (Proceedings - IEEE International Symposium on Circuits and Systems). https://doi.org/10.1109/ISCAS.2006.1692555