Upper bounds on the bit-error rate of optimum combining in wirelesssystems
Winters, J.H.
Salz, J.
AT&T Labs., Red Bank, NJ;
This paper appears in: Communications, IEEE Transactions on
Publication Date: Dec 1998
Volume: 46,
Issue: 12
On page(s): 1619-1624
ISSN: 0090-6778
References Cited: 10
CODEN: IECMBT
INSPEC Accession Number: 6138420
Digital Object Identifier: 10.1109/26.737400
Posted online: 2002-08-06 22:05:43.0
Abstract
This paper presents upper bounds on the bit-error rate (BER) of
optimum combining in wireless systems with multiple cochannel
interferers in a Rayleigh fading environment. We present closed-form
expressions for the upper bound on the bit-error rate with optimum
combining, for any number of antennas and interferers, with coherent
detection of BPSK and QAM signals, and differential detection of DPSK.
We also present bounds on the performance gain of optimum combining over
maximal ratio combining. These bounds are asymptotically tight with
decreasing BER, and results show that the asymptotic gain is within 2 dB
of the gain as determined by computer simulation for a variety of cases
at a 10-3 BER. The closed-form expressions for the bound
permit rapid calculation of the improvement with optimum combining for
any number of interferers and antennas, as compared with the CPU hours
previously required by Monte Carlo simulation. Thus these bounds allow
calculation of the performance of optimum combining under a variety of
conditions where it was not possible previously, including analysis of
the outage probability with shadow fading and the combined effect of
adaptive arrays and dynamic channel assignment in mobile radio systems
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