Title :
M-ary CDMA scheme based on interference cancellation
Author :
Kawabe, Manabu ; Sato, Takuro ; Kato, Toshio ; Fukasawa, Atsushi ; Kohno, Ryuji
Author_Institution :
Commun. Syst. Lab., Oki Electr. Ind. Co. Ltd., Tokyo, Japan
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 26 Walsh codes as spreading codes under Rayleigh fading conditions
Keywords :
Rayleigh channels; Walsh functions; channel capacity; channel coding; code division multiple access; correlation methods; fading; interference suppression; personal communication networks; M-ary CDMA scheme; Rayleigh fading conditions; Walsh orthogonal code; communication quality; computer simulation; correlation value; fading variation; interference cancellation; personal communication service; spreading codes; spreading ratio; system capacity; Computer simulation; Data communication; Frequency; Interference cancellation; Laboratories; Multiaccess communication; Personal communication networks; Phase change materials; Rayleigh channels; Speech coding;
Conference_Titel :
Circuits and Systems, 1994. APCCAS '94., 1994 IEEE Asia-Pacific Conference on
Conference_Location :
Taipei
Print_ISBN :
0-7803-2440-4
DOI :
10.1109/APCCAS.1994.514520
