This paper derives truncated union bounds on the a priori index crossover probabilities p(j/i) that result when an n-bit data index i is convolutionally encoded, transmitted over a noisy channel, and decoded with the ...
详细信息
This paper derives truncated union bounds on the a priori index crossover probabilities p(j/i) that result when an n-bit data index i is convolutionally encoded, transmitted over a noisy channel, and decoded with the Viterbi algorithm, giving received index j, The bounds are derived with a modified transfer function technique, using n-stage state transition matrices with symbolic labels. The technique is easily automated with commercial symbolic algebra packages, Bounds are obtained for convolutional and trellis-coded modulation (TCM) codes, over binary-symmetric and additive white Gaussian noise (AWGN) channels. A joint source channel coding example demonstrates that the bounds on p(j/i) developed in this paper can give a 1-3-dB accuracy improvement in end-to-end signal-to-noise ratio (SNR) predictions, when compared to predictions based on bounds on the delivered bit error probability P-b.
暂无评论