Title :
Analysis of MMSE beamformer for DS-CDMA systems
Author :
Wang, N.Y. ; Agathoklis, P. ; Antoniou, A.
Author_Institution :
Dept. of Electr. & Comput. Eng., Victoria Univ., BC, Canada
Abstract :
The performance of two commonly used criteria to obtain the optimum beamforming weights in adaptive antenna arrays, namely, the chip-based mean-squared-error (MMSE) criterion and the symbol-based MMSE criterion, is investigated and a qualitative explanation for the difference in their performance is given. In the first criterion, spatial diversity is exploited in the determination of the beamforming weights. In the second, code separation and spatial diversity are utilized. It is shown that the utilization of code separation in the determination of beamforming weights leads to less noise magnification resulting from interference rejection. Analysis and simulation results show that the symbol-based MMSE criterion offers a better performance than the chip-based MMSE criterion in the presence of multiple access interference
Keywords :
adaptive antenna arrays; array signal processing; code division multiple access; direction-of-arrival estimation; diversity reception; least mean squares methods; personal communication networks; radiofrequency interference; spread spectrum communication; DS-CDMA systems; MMSE beamformer; adaptive antenna arrays; chip-based MMSE criterion; code separation; interference rejection; multiple access interference; noise magnification; optimum beamforming weights; personal communication systems; simulation results; spatial diversity; symbol-based MMSE criterion; Adaptive arrays; Analytical models; Antenna accessories; Antenna arrays; Array signal processing; Directive antennas; Multiaccess communication; Multiple access interference; Performance analysis; Signal to noise ratio;
Conference_Titel :
Communications, Computers and signal Processing, 2001. PACRIM. 2001 IEEE Pacific Rim Conference on
Conference_Location :
Victoria, BC
Print_ISBN :
0-7803-7080-5
DOI :
10.1109/PACRIM.2001.953539
