Title :
Downlink performance analysis of a BPSK-based WCDMA using conventional RAKE receivers with channel estimation
Author :
Guenach, M. ; Vandendorpe, L.
Author_Institution :
Commun. & Remote Sensing Lab., Univ. Catholique de Louvain, Belgium
fDate :
11/1/2001 12:00:00 AM
Abstract :
We consider the downlink of a Universal Mobile Telecommunication System terrestrial radio access-wideband code division multiple access (UTRA-WCDMA) system and we investigate the performance of the conventional RAKE receiver. A multipath slowly Rayleigh fading channel is assumed. For the purpose of channel tap weight estimation, a common control physical channel, that is either serial or parallel multiplexed with the dedicated physical channels, is used. The receiver sensitivity to imperfect knowledge of the path delays, to the number of pilot symbols, and to the power ratio of pilot to data channels is also investigated. The system performance is evaluated by means of bit-error rates (BERs) derived using quadratic forms and characteristic functions for a BPSK modulation. The mean-squared estimation error (MSEE) of the channel tap weights is also computed and compared to the classical Cramer-Rao lower bound (CRLB). The mutual interference between pilot and data symbols is taken into account
Keywords :
Rayleigh channels; broadband networks; code division multiple access; data communication; delays; diversity reception; error statistics; land mobile radio; mean square error methods; multiuser channels; parameter estimation; phase shift keying; radio access networks; radio links; radio receivers; spread spectrum communication; BER; BPSK; BPSK-based WCDMA; Cramer-Rao lower bound; MRC RAKE receiver; UTRA-WCDMA; Universal Mobile Telecommunication System; bit-error rates; channel estimation; channel tap weight estimation; channel tap weights; characteristic functions; common control physical channel; downlink performance analysis; maximum ratio combining; mean-squared estimation error; multipath slowly Rayleigh fading channel; mutual interference; parallel multiplexed channels; path delays; pilot symbols; pilot to data channels power ratio; quadratic forms; receiver sensitivity; serial multiplexed channels; system performance evaluation; terrestrial radio access system; wideband code division multiple access; Bit error rate; Delay; Downlink; Fading; Multiaccess communication; Multipath channels; Performance analysis; RAKE receivers; System performance; Telecommunication control;
Journal_Title :
Selected Areas in Communications, IEEE Journal on
