EM-based acquisition of DS-CDMA waveforms for radiolocation

Author

Iltis, Ronald A. ; Kim, Sunwoo ; Thomas, Anne

Author_Institution

Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA

Volume

4

fYear

2001

fDate

2001

Firstpage

2229

Abstract

A handshaking protocol for radiolocation is considered using DS-CDMA packet transmission. The expectation-maximization (EM) algorithm is employed for code delay acquisition. It is shown that the systematic application of EM on the flat-fading channel yields a parallel interference cancellation (PIC)-based technique for acquisition. On the frequency-selective channel, it is necessary to jointly estimate both the code delays and multipath coefficients. The EM approach in this latter case yields an algorithm that combines PIC with an eigendecomposition/eigenvalue maximization step for channel identification

Keywords

channel coding; code division multiple access; delay estimation; eigenvalues and eigenfunctions; fading channels; interference suppression; multipath channels; optimisation; packet radio networks; packet switching; protocols; signal detection; spread spectrum communication; DS-CDMA; EM algorithm; channel identification; code delay acquisition; delay estimation; eigendecomposition; eigenvalue maximization; expectation maximization algorithm; flat-fading channel; frequency-selective channel; handshaking protocol; multipath coefficients; packet transmission; parallel interference cancellation; radiolocation; Application software; Delay estimation; Fading; Frequency; Gaussian noise; Interference cancellation; Multiaccess communication; Navigation; Protocols; Radiofrequency identification;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 2001. Proceedings. (ICASSP '01). 2001 IEEE International Conference on

Conference_Location

Salt Lake City, UT

ISSN

1520-6149

Print_ISBN

0-7803-7041-4

Type

conf

DOI

10.1109/ICASSP.2001.940441

Filename

940441