Convergence behaviour of linear parallel cancellation in CDMA

Author

Rasmussen, Lars K. ; Oppermann, Ian J.

Author_Institution

Dept. of Comput. Eng., Chalmers Univ. of Technol., Goteborg, Sweden

Volume

5

fYear

2001

fDate

6/23/1905 12:00:00 AM

Firstpage

3148

Abstract

In this paper, the convergence behaviour of linear parallel interference cancellation is investigated. Especially the so-called ping-pong effect where the bit error rate performance is found to oscillate between two different convergence patterns is studied in detail. This effect is shown to be a direct consequence of the extreme eigenvalues of the correlation matrix, allowing for an analytical approach. Intervals for the dominating eigenvalues within which ping-pong effects can occur are specified and illustrated by examples. Relaxation factors, leading to weighted cancellation, are shown to be effective for alleviating oscillations and ping-pong effects at the expense of convergence rate

Keywords

code division multiple access; convergence of numerical methods; correlation methods; eigenvalues and eigenfunctions; error statistics; interference suppression; matrix inversion; bit error rate performance; convergence behaviour; correlation matrix; eigenvalues; linear parallel interference cancellation; oscillations; ping-pong effect; relaxation factors; weighted cancellation; AWGN; Baseband; Bit error rate; Convergence; Eigenvalues and eigenfunctions; Interference cancellation; Jacobian matrices; Matched filters; Multiaccess communication; Statistics;

fLanguage

English

Publisher

ieee

Conference_Titel

Global Telecommunications Conference, 2001. GLOBECOM '01. IEEE

Print_ISBN

0-7803-7206-9

Type

conf

DOI

10.1109/GLOCOM.2001.966007

Filename

966007