Performance of wireless CDMA with M-ary orthogonal modulation andcell site antenna arrays
Naguib, A.F.
Paulraj, A.
Inf. Syst. Lab., Stanford Univ., CA;
This paper appears in: Selected Areas in Communications, IEEE Journal on
Publication Date: Dec 1996
Volume: 14,
Issue: 9
On page(s): 1770-1783
ISSN: 0733-8716
References Cited: 31
CODEN: ISACEM
INSPEC Accession Number: 5467599
Digital Object Identifier: 10.1109/49.545700
Current Version Published: 2002-08-06
Abstract
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 the number of
users, number of antennas, and the 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
the 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
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