Title :
Performance of linear multiuser receivers in random environments
Author :
Tse, David N C ; Zeitouni, Ofer
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., California Univ., Berkeley, CA, USA
Abstract :
We study the signal-to-interference (SIR) performance of linear multiuser receivers in random environments, where signals from the users arrive in “random directions”. Such random environment may arise in a DS-CDMA system with random signature sequences, or in a system with antenna diversity where the randomness is due to channel fading. Our results show that for both the decorrelator and the MMSE receiver, and the SIR distribution is asymptotically Gaussian in a system with large number of users. We compute closed-form expressions for the asymptotic means and variances for both receivers. Simulation results are presented to verify the accuracy of the asymptotic results for finite-sized systems
Keywords :
Gaussian distribution; code division multiple access; decorrelation; diversity reception; fading channels; least mean squares methods; multiuser channels; radio receivers; radiofrequency interference; random processes; sequences; spread spectrum communication; DS-CDMA system; MMSE receiver; SIR distribution; SIR performance; accuracy; antenna diversity; asymptotic means; asymptotically Gaussian distribution; channel fading; closed-form expressions; decorrelator; finite-sized systems; linear multiuser receivers; random directions; random environments; random signature sequences; receivers; signal-to-interference; simulation results; variances; Closed-form solution; Decorrelation; Direct-sequence code-division multiple access; Fading; Fluctuations; Interference suppression; Multiaccess communication; Performance analysis; Rayleigh channels; Receiving antennas;
Conference_Titel :
Communication Theory Mini-Conference, 1999
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-5653-5
DOI :
10.1109/CTMC.1999.790257
