Title :
Pilot power allocation for CDMA systems with antenna arrays
Author :
Thompson, John S. ; Bevan, D. D Damian N
Author_Institution :
Dept. of Electr. Eng., Edinburgh Univ., UK
Abstract :
This paper discusses the uplink of a third generation code division multiple access wireless system using antenna arrays at the base station. Each user sends a pilot signal with their modulated data, whose power can be varied as required by the base station. The uplink is then detected coherently using the pilot signal to estimate the channel coefficients for each mobile. Theoretical results on signal-to-noise ratio (SNR) degradation due to imperfect channel estimation are used to determine the optimum power allocation for the pilot signal in a Rayleigh fading environment. The results call be used for any SNR, for any channel Doppler frequency and for any receiver array size
Keywords :
Doppler effect; Rayleigh channels; antenna arrays; code division multiple access; diversity reception; land mobile radio; multiuser channels; noise; radio links; CDMA systems; Rayleigh fading; SNR degradation; antenna arrays; base station; channel Doppler frequency; channel coefficient estimation; code division multiple access; imperfect channel estimation; mobile communication systems; modulated data; optimum power allocation; pilot power allocation; pilot signal; receiver array size; receiver diversity combining; signal-to-noise ratio; third generation wireless system; uplink; Antenna arrays; Base stations; Channel estimation; Diversity reception; Gaussian noise; Multiaccess communication; Rayleigh channels; Receiving antennas; Signal to noise ratio; Transmitters;
Conference_Titel :
Sensor Array and Multichannel Signal Processing Workshop. 2000. Proceedings of the 2000 IEEE
Conference_Location :
Cambridge, MA
Print_ISBN :
0-7803-6339-6
DOI :
10.1109/SAM.2000.878044
