Second order moment estimation for multilevel quantized tailed shifts sequences optimising BER for asynchronous DS-CDMA systems

Author

Vladeanu, C. ; Lucaciu, R.

Author_Institution

Fac. of Electron., Telecommun. & Inf. Theor., Bucharest Univ. Politehnica, Romania

Volume

2

fYear

2005

fDate

14-15 July 2005

Firstpage

661

Abstract

Chaotic sequences offer a good alternative for spreading in DS-CDMA (direct sequence-code division multiple access) systems. These sequences are generated by nonlinear feedback dynamical systems and have interesting features like a very sensitive dependency on the initial state and noiselike correlation properties. This paper considers the case of a very well known family of PWAM (piece-wise affine Markov) maps, namely (n,t)-tailed shifts maps, and their quantized versions. In DS-CDMA systems the MAI (multiple access interference) is depending on the correlation properties of the spreading sequences. Hence, here we present the estimation method for the second order statistical moment of quantized (n,t)-tailed shifts sequences and its optimization for reducing MAI.

Keywords

Markov processes; code division multiple access; error statistics; interference (signal); quantisation (signal); spread spectrum communication; BER optimization; asynchronous DS-CDMA systems; direct sequence-code division multiple access; multilevel quantized tailed shifts sequences; multiple access interference; piece-wise affine Markov maps; second order moment estimation; second order statistical moment; Autocorrelation; Bit error rate; Chaos; Design optimization; Information theory; Multiaccess communication; Multiple access interference; Noise generators; Optimization methods; State feedback;

fLanguage

English

Publisher

ieee

Conference_Titel

Signals, Circuits and Systems, 2005. ISSCS 2005. International Symposium on

Print_ISBN

0-7803-9029-6

Type

conf

DOI

10.1109/ISSCS.2005.1511327

Filename

1511327