Dual-K Convolutional Codes for Noncoherently Demodulated Channels
AuthorOdenwalder, U. P.
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AbstractWhile the advantages of convolutional coding for coherently demodulated channels have become widely accepted, less work has been done on coding techniques for noncoherently demodulated channels used in channels experiencing fading or intentional interference. Here we describe a simple class of convolutional codes called dual-k  codes for use on 2ᵏ-ary orthogonal signal modulated channels and show how they can be used with soft-decision Viterbi decoding on noncoherently demodulated channels. The main result of this paper is a derivation of a closed form expression for the transfer function , T(D,N,L), for optimum (in the sense of best Hamming distance) dual-k convolutional codes. Examples of the technique of obtaining upper bounds on the bit error probability using this transfer function are also given for a noncoherently demodulated Rayleigh fading channel.
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