Performance of wireless CDMA with M-ary orthogonal modulation and cell site antenna arrays

被引:94
作者
Naguib, AF [1 ]
Paulraj, A [1 ]
机构
[1] STANFORD UNIV, DEPT ELECT ENGN, INFORMAT SYST LAB, STANFORD, CA 94305 USA
关键词
D O I
10.1109/49.545700
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
In this paper, an antenna array-based base station receiver structure for wireless direct-sequence code-division multiple-access (DS/CDMA) with M-ary orthogonal modulation is proposed, The base station uses an antenna array Beamformer-RAKE structure with noncoherent equal gain combining, The receiver consists of a ''front end'' beamsteering processor feeding a conventional noncoherent RAKE combiner, The performance of the proposed receiver with closed loop power control in multipath fading channels is evaluated, Expressions for the system uncoded bit-error probability (BEP) as a function of number of users, number of antennas, and angle spread are derived for different power control scenarios, The system capacity in terms of number of users that can be supported for a given uncoded BEP is also evaluated, Analysis results show a performance improvement in terms of system capacity due to the use of antenna arrays and the associated signal processing at the base station, In particular, analysis results show an increase in system capacity that is proportional to the number of antennas, They also show an additional performance improvement due to space diversity gain provided by the array for nonzero angle spreads.
引用
收藏
页码:1770 / 1783
页数:14
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