Maximum likelihood synchronization of DS-CDMA signals transmitted over multipath channels

Author

Ström, Erik G. ; Malmsten, Fredrik

Author_Institution

Dept. of Signals & Syst., Chalmers Univ. of Technol., Goteborg, Sweden

Volume

3

fYear

1998

fDate

7-11 Jun 1998

Firstpage

1546

Abstract

We propose a maximum likelihood approach for near-far robust synchronization of asynchronous direct-sequence code-division multiple access (DS-CDMA) systems operating over multipath channels. The algorithm is suitable for use in for instance a slotted system where each user transmits a short data burst with an embedded training sequence. The algorithm is shown to outperform the standard sliding correlator estimator. The Cramer-Rao bound is derived and is used to indicate the best performance that can be achieved by an unbiased estimator

Keywords

code division multiple access; maximum likelihood estimation; multipath channels; pseudonoise codes; spread spectrum communication; synchronisation; Cramer-Rao bound; DS-CDMA signals; algorithm; asynchronous DS-CDMA systems; direct-sequence code-division multiple access; embedded training sequence; maximum likelihood synchronization; multipath channels; near-far robust synchronization; performance; short data burst transmission; sliding correlator estimator; slotted system; unbiased estimator; Channel estimation; Correlators; Direct-sequence code-division multiple access; Fading; Maximum likelihood detection; Maximum likelihood estimation; Multiaccess communication; Multipath channels; Power control; Robustness;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, 1998. ICC 98. Conference Record. 1998 IEEE International Conference on

Conference_Location

Atlanta, GA

Print_ISBN

0-7803-4788-9

Type

conf

DOI

10.1109/ICC.1998.683083

Filename

683083