Markovian SS codes imply inversion-free code acquisition in asynchronous DS/CDMA systems

Author

Eshima, Nobuoki ; Jitsumatsu, Yutaka ; Kohda, Tohru

Author_Institution

Dept. of Med. Inf. Anal., Oita Med. Univ., Japan

Volume

4

fYear

2004

fDate

23-26 May 2004

Abstract

Conventional single user correlators for asynchronous DS/CDMA systems provide only one scalar value for each data period. Code acquisition is expected to be improved if sampling is performed once each chip time. This accurate code acquisition method is shown to require the covariance matrix of SS codes, while the optimum method needs inversion of the covariance matrix. However, Markovian SS codes with eigen value -2+√3 do not need matrix inversion, which is the same value needed to achieve minimum bit error rate.

Keywords

Markov processes; code division multiple access; correlators; covariance matrices; data acquisition; eigenvalues and eigenfunctions; error statistics; sampling methods; spread spectrum communication; Markovian SS codes; asynchronous DS-CDMA systems; bit error rate; covariance matrix; eigenvalues; inversion free code acquisition method; matrix inversion; optimum method; sampling method; single user correlator; Bit error rate; Character generation; Chromium; Correlators; Covariance matrix; Eigenvalues and eigenfunctions; Information analysis; Interference; Multiaccess communication; Sampling methods;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on

Print_ISBN

0-7803-8251-X

Type

conf

DOI

10.1109/ISCAS.2004.1329079

Filename

1329079