Concatenated coding and online SNR estimation for FH-SS systems in the presence of partial band interference

In this paper, two famous concatenated codes schemes are investigated in a slow frequency hopped spread spectrum "FH-SS" system with partial band interference over an additive white Gaussian noise channel. The first code is Reed-Solomon outercode concatenated with a convolutional inner-code "RS-CC code" and the second is a Turbo code. The proposed system blindly estimates the signal-to-noise ratio "SNR" of the channel during each hop for the computation of the probability distributions which are required by the Turbo decoder and the Viterbi decoder. Simulations are performed for coherent and noncoherent demodulation. We have shown that there exists an optimum hop size for each coding system that gives the best performance. This optimum value depends on both the coding system used and on the jammed fraction of the total used bandwidth.