M-ary CDMA scheme based on interference cancellation

Abstract

This paper describes the configuration, analysis and characteristics of an M-ary CDMA using Interference Cancellation (IC) with the Walsh orthogonal code. The IC reduces interference signals of other Personal Stations (PSs), improves communication quality and increases system capacity in a cell. In this IC scheme, the cancellation value is calculated from the correlation value, and then the cancellation value corresponds to the variation of fading. Analysis results indicate that the limitation of the system capacity becomes equal to the spreading ratio when IC is used. A computer simulation shows that simultaneously accessing users per cell are obtained up to 40 channels using 2/sup 6/ Walsh codes as spreading codes under Rayleigh fading conditions.