Title :
Performance Analysis of Multiuser Transmission with Adaptive Antenna Arrays Using Spatial Classes
Author :
Jiang Zheng ; Liao Yanyan ; Zhang Yan ; Yan, Zhang ; Zhang Xin
Author_Institution :
Beijing Univ. of Posts & Telecommun., Beijing
Abstract :
CDMA system capacity is interference limited. The multiuser transmission (MUT) with adaptive antenna arrays for the downlink direction is considered to increase system capacity and to eliminate the multiple-access interference (MAI) and the inter-symbol interference (ISI) of the CDMA system. In this paper, the angular gain of the spatial filter is modeled by a piece-line function to analysis the interference difference between the in-beam users and the out-beam users. Based on this analysis, a lower complexity MUT scheme using spatial classes is proposed for avoiding MUT computation complexity, which can achieve the nearly same performance with the conventional MUT scheme. The bit-error probability approximation of this MUT scheme is also analyzed as well. The simulation result is used to confirm the availability of this lower complexity MUT scheme.
Keywords :
adaptive antenna arrays; code division multiple access; error statistics; filtering theory; intersymbol interference; multiuser channels; radio links; radiofrequency interference; CDMA system capacity; ISI; MAI; adaptive antenna arrays; bit-error probability approximation; downlink direction; in-beam users; inter-symbol interference; multiple-access interference; multiuser transmission; out-beam users; piece-line function; spatial classes; spatial filter; Adaptive arrays; Antenna arrays; Directive antennas; Downlink; Interference elimination; Intersymbol interference; Multiaccess communication; Multiple access interference; Performance analysis; Transmitting antennas;
Conference_Titel :
Vehicular Technology Conference, 2007. VTC-2007 Fall. 2007 IEEE 66th
Conference_Location :
Baltimore, MD
Print_ISBN :
978-1-4244-0263-2
Electronic_ISBN :
1090-3038
DOI :
10.1109/VETECF.2007.213
