Duality between Broadcasting with Bandwidth Expansion and Bandwidth Compression
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We consider the problem of broadcasting κ samples of an independent identically distributed (i.i.d) Gaussian source to two users in n - λκ uses of an AWGN channel. We develop a framework which shows a duality between a source-channel coding scheme for the case of λ > 1 and that for λ > 1. Using this duality, we derive a scheme for the case of λ < 1, which is the dual of a scheme recently proposed by Reznic, Zamir and Feder in . This scheme, which provides the largest known achievable distortion region currently known, is also the same as that proposed by Prabhakaran et al in  specialized to the case of an i.i.d source with λ < 1. We also provide an explanation for why this scheme performs well by first analyzing the performance of source-channel coding schemes in the presence of a signal-to-noise ratio mismatch. ©2007 IEEE.
author list (cited authors)
Narayanan, K., Caire, G., & Wilson, M.