Title :
The tradeoff between diversity gain and interference suppression via beamforming in a CDMA system
Author :
Zhang, Yan ; Milstein, Laurence B. ; Siegel, Paul H.
Author_Institution :
Dept. of ECE, California Univ., San Diego, La Jolla, CA, USA
Abstract :
In this paper, the uplink of an asynchronous direct sequence code division multiple access (DS-CDMA) system with multiple antennas at both the transmitter and the receiver is considered. We analyze the system performance over a spatially correlated Rayleigh fading channel with multiple access interference (MAI). Assuming perfect channel knowledge available at the transmitter, maximal ratio transmission (MRT) is employed to weight the transmitted signal optimally in terms of combating signal fading. Further, adaptive beamforming reception is adopted to suppress MAI and also to combat the fading. We examine the effect of varying the number of transmit and receive antennas on the diversity gain and interference suppression.
Keywords :
Rayleigh channels; antenna arrays; array signal processing; code division multiple access; correlation theory; diversity reception; interference suppression; radiofrequency interference; receiving antennas; spread spectrum communication; transmitting antennas; DS-CDMA system; MAI; adaptive beamforming reception; asynchronous direct sequence code division multiple access system; diversity gain; interference suppression; maximal ratio transmission; multiple access interference; multiple antennas; receive antennas; spatially correlated Rayleigh fading channel; transmit antenna; Array signal processing; Direct-sequence code-division multiple access; Diversity methods; Interference suppression; Multiaccess communication; Multiple access interference; Rayleigh channels; Receiving antennas; Transmitters; Transmitting antennas;
Conference_Titel :
Military Communications Conference, 2003. MILCOM '03. 2003 IEEE
Print_ISBN :
0-7803-8140-8
DOI :
10.1109/MILCOM.2003.1290343
