C. Pimentel et If. Blake, Concatenated coding performance for FSK modulation on time-correlated Rician fading channels, IEEE COMMUN, 46(12), 1998, pp. 1610-1618
We present in this paper an analytical method for evaluating the performanc
e of noninterleaved concatenated codes over channels modeled as a nonfreque
ncy selective correlated Rician fading channel with a known power spectral
density. The main idea is to model the communication system from the modula
tor input to the demodulator output as a finite state channel (FSC) model,
and apply powerful enumeration techniques to such a discrete channel in ord
er to gain useful information on system performance. The concatenated schem
e makes use of two codes; Reed-Solomon codes are employed for the outer cod
e, and binary block codes are used as the inner code, Next, the method is e
xtended to study the effect on the performance when an interleaving with fi
nite depth is incorporated into the communication system. A comparison betw
een symbol and bit interleaving is made. Finally, we study the potential ga
in produced when channel information is passed on to the outer decoder in t
he form of an erasure symbol. In all cases, analytical expressions for the
probability of the number of error symbols produced by the FSC model mere o
btained in terms of a coefficient in a formal power series, This is an inte
resting alternative approach with respect to computer simulations.