Title :
Analysis on forward link pilot ratio for DS-CDMA under correlated Rician fading
Author_Institution :
Dept. of Wireless Syst. Core Technol., Lucent Technol., Whippany, NJ, USA
Abstract :
In the forward link of many CDMA systems, a common pilot channel (shared by all users) is employed to provide the reference for coherent demodulation. A higher pilot ratio yields a good channel estimate but takes away some capacity from traffic users while a lower pilot ratio results in a higher traffic power need per user. This paper analyzes this trade-off by deriving the analytical error performance which includes (1) the imperfect channel estimation by pilot channel and (2) a very general channel model where correlation between paths as well as Rician fading (ranges from Rayleigh to AWGN) is considered. The effect of the interference pattern from different base stations is also evaluated
Keywords :
AWGN channels; Rayleigh channels; Rician channels; cellular radio; code division multiple access; correlation methods; demodulation; multiuser channels; parameter estimation; radio links; radiofrequency interference; spread spectrum communication; telecommunication traffic; AWGN channel; BER; DS-CDMA; IMT-2000; IS-95; Rayleigh fading; analytical error performance; base stations; channel estimate; coherent demodulation; correlated Rician fading; forward link pilot ratio; general channel model; imperfect channel estimation; interference pattern; pilot channel; signal representation; traffic power; AWGN; Channel estimation; Demodulation; Error analysis; Interference; Multiaccess communication; Performance analysis; Rician channels; Traffic control; Yield estimation;
Conference_Titel :
Global Telecommunications Conference, 1998. GLOBECOM 1998. The Bridge to Global Integration. IEEE
Conference_Location :
Sydney,NSW
Print_ISBN :
0-7803-4984-9
DOI :
10.1109/GLOCOM.1998.776445
