Summary: ITW2003, Paris, France, March 31 -- April 4, 2003
Performance Analysis of MAP Decoded SpaceTime Orthogonal
Block Codes for NonUniform Sources *
Firouz Behnamfar y , Fady Alajaji yz , and Tam’as Linder yz
y Department of Electrical and Computer Engineering, z Department of Mathematics and Statistics
Queen's University, Kingston, Ontario, Canada.
ffirouz, fady, firstname.lastname@example.org
Abstract --- We derive a closedform expression for the
exact pairwise error probability (PEP) of a nonuniform
memoryless binary source transmitted over a Rayleigh
fading channel using spacetime orthogonal block codes
and maximum a posteriori (MAP) detection. The expres
sion is easy to evaluate and holds for any signaling scheme.
We then use this result to minimize the bit error rate of
the binary antipodal signaling scheme. Numerical results
for the case of binary antipodal signaling (BPSK and opti
mal) verify the accuracy of our formula and quantify sub
stantial gains of MAP decoding over maximum likelihood
(ML) decoding for sources with strong nonuniformity.