TY - GEN
T1 - Universal decoding over Gaussian fading channels - Metric calculation and performance evaluation
AU - Weinberger, Nir
AU - Feder, Meir
PY - 2011
Y1 - 2011
N2 - In a previous work, a universal decoder in a competitive minimax sense was developed for unknown block fading linear white Gaussian channels. For a given codebook (with finite blocklength), a high SNR optimal metric for the decoder was found, whose direct calculation requires solving a non-convex optimization problem and may be formidable. In this paper, the metric calculation problem is facilitated by semidefinite programming, which leads to a low-complexity approximation for the metric. The competitive minimax performance of the optimal decoder (i.e., its worst case power loss compared to the maximum likelihood decoder, which has full knowledge of the channel) is evaluated, and upper lower bounds are derived for the performance evaluation of non-optimal decoders - the training sequence and the generalized likelihood test decoders.
AB - In a previous work, a universal decoder in a competitive minimax sense was developed for unknown block fading linear white Gaussian channels. For a given codebook (with finite blocklength), a high SNR optimal metric for the decoder was found, whose direct calculation requires solving a non-convex optimization problem and may be formidable. In this paper, the metric calculation problem is facilitated by semidefinite programming, which leads to a low-complexity approximation for the metric. The competitive minimax performance of the optimal decoder (i.e., its worst case power loss compared to the maximum likelihood decoder, which has full knowledge of the channel) is evaluated, and upper lower bounds are derived for the performance evaluation of non-optimal decoders - the training sequence and the generalized likelihood test decoders.
UR - http://www.scopus.com/inward/record.url?scp=80054814396&partnerID=8YFLogxK
U2 - 10.1109/ISIT.2011.6033829
DO - 10.1109/ISIT.2011.6033829
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AN - SCOPUS:80054814396
SN - 9781457705953
T3 - IEEE International Symposium on Information Theory - Proceedings
SP - 1668
EP - 1672
BT - 2011 IEEE International Symposium on Information Theory Proceedings, ISIT 2011
T2 - 2011 IEEE International Symposium on Information Theory Proceedings, ISIT 2011
Y2 - 31 July 2011 through 5 August 2011
ER -