Frame error rates for convolutional codes on fading channels andthe concept of effective Eb/N0 |
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Authors: | Nanda S Rege KM |
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Affiliation: | AT&T Bell Labs., Holmdel, NJ; |
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Abstract: | Estimation of Viterbi decoder performance over channels with time-varying received signal levels is the subject of this paper. This work is motivated by a desire to obtain good estimates of the frame error rate (FER) for convolutional codes with bit-level interleaving over fading channels subject to practical power control algorithms. The convolutional code performance is quantified through the FER and effective Eb/N0. where the latter is defined as the Eb/N0 on an additive white Gaussian noise (AWGN) channel that results in the same FER. Given a received vector of (time-varying) Eb/N0 values, we compute analytic estimates for the probability of frame error and the effective Eb /N0 for a Viterbi decoder and interleaver combination. In particular, we validate our analysis using the R=1/3 convolutional code and interleaver used on the IS-95 CDMA reverse channel. Comparisons with simulations show that even for Eb/N0 vectors with very large variations, our proposed estimates are good to within 0.2 dB for the effective Eb/N0, giving FER estimates within a factor of two-five of the simulations |
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