Title :
Interference effects in downlink channels of a multi-rate CDMA communication system
Author :
Luo, T. ; Sousa, E.S. ; Pasupathy, S.
Author_Institution :
Dept. of Electr. & Comput. Eng., Toronto Univ., Ont., Canada
Abstract :
This paper studies the interference effects in downlink channels of a multi-rate CDMA communication system employing variable length orthogonal spreading code (VLOS). We quantify the interaction between different rate users in terms of the output signal to interference plus noise ratio (SINR) of a conventional matched filter receiver followed by a RAKE combiner. We show that the high rate users cause significant interference to the low rate users which is proportional to their rate ratio; high rate users also cause significant interference to the desired high rate users due to the small processing gain of the desired high rate users
Keywords :
code division multiple access; filtering theory; land mobile radio; matched filters; multiuser channels; pseudonoise codes; radio receivers; radiofrequency interference; spread spectrum communication; variable length codes; PN sequence; RAKE combiner; correlation properties; downlink channels; high rate user receiver; interference effects; low rate user receiver; matched filter receiver; multi-rate CDMA communication system; output SINR; processing gain; rate ratio; signal to interference plus noise ratio; third-generation system; variable length orthogonal spreading code; Downlink; Educational institutions; Interference; Internet; Matched filters; Multiaccess communication; Multimedia systems; RAKE receivers; Signal to noise ratio; Wireless communication;
Conference_Titel :
Vehicular Technology Conference Proceedings, 2000. VTC 2000-Spring Tokyo. 2000 IEEE 51st
Conference_Location :
Tokyo
Print_ISBN :
0-7803-5718-3
DOI :
10.1109/VETECS.2000.851457
