Abstract
A discrete-time channel with independent additive Gaussian noise is used for information transmission. There is also a feedback channel with independent additive Gaussian noise, and the transmitter observes all outputs of the forward channel without delay via this feedback channel. Transmission of a nonexponential number of messages is considered (i.e., the transmission rate is zero), and the achievable decoding error exponent for such a combination of channels is investigated. It is shown that for any finite noise in the feedback channel the achievable error exponent is better than the similar error exponent for a no-feedback channel. The transmission/decoding method developed in the paper strengthens the method earlier used by the authors for a BSC. In particular, for small feedback noise, it provides a gain of 23.6% (instead of 14.3% obtained earlier for a BSC).
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Original Russian Text © M.V. Burnashev, H. Yamamoto, 2012, published in Problemy Peredachi Informatsii, 2012, Vol. 48, No. 3, pp. 3–22.
Supported in part by the Russian Foundation for Basic Research, project no. 12-01-00905a.
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Burnashev, M.V., Yamamoto, H. On the reliability function for a noisy feedback Gaussian channel: Zero rate. Probl Inf Transm 48, 199–216 (2012). https://doi.org/10.1134/S0032946012030015
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DOI: https://doi.org/10.1134/S0032946012030015