Title :
The effect of path diversity (RAKE) on link reliability in CDMA cellular systems-a realistic assessment of system capacity
Author :
Lee, Jhong S. ; Miller, Leonard E.
Author_Institution :
J.S. Lee Assoc. Inc., Rockville, MD, USA
Abstract :
The reliability of a CDMA cellular system reverse link is formulated as the probability that the link SNR is above the required threshold, accounting for multiple users, multipath receptions, signal and multipath fading, and Rake multipath diversity processing. Calculations of reliability show the gains obtained through RAKE processing, and the necessity of this processing when multipaths exist. It is shown that when multipath interference and link reliability requirements are accounted for, the number of CDMA users can be much smaller than that predicted using median SNR values
Keywords :
cellular radio; channel capacity; code division multiple access; digital radio; diversity reception; fading; land mobile radio; multipath channels; pseudonoise codes; radio links; radio receivers; radiofrequency interference; signal processing; spread spectrum communication; telecommunication network reliability; CDMA cellular systems; DS-CDMA; IS-95 North American digital cellular system; RAKE multipath diversity processing; RAKE receiver; link SNR; median SNR values; multipath fading; multipath interference; multipath receptions; multiple users; path diversity; probability; reverse link reliability; signal fading; system capacity; threshold; Analysis of variance; Delay; Interference; Multiaccess communication; Power control; Power system modeling; Radio transmitters; Rayleigh channels; Signal analysis; Signal to noise ratio;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 1996. PIMRC'96., Seventh IEEE International Symposium on
Conference_Location :
Taipei
Print_ISBN :
0-7803-3692-5
DOI :
10.1109/PIMRC.1996.568459
