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A Comparison of Soft and Hard Coded Relaying
"Amplify and Forward" and "Decode and Forward" are the two main relaying
functions that have been proposed since the advent of cooperative
communication. "\textit{Soft} Decode and Forward" is a recently introduced
relaying principle that is to combine the benefits of the classical two
relaying algorithms. In this work, we thoroughly investigate \textit{soft}
relaying algorithms when convolutional or turbo codes are applied. We study the
error performance of two cooperative scenarios employing soft-relaying. A novel
approach, the mutual information loss due to data processing, is proposed to
analyze the relay-based soft encoder. We also introduce a novel approach to
derive the estimated bit error rate and the equivalent channel SNR for the
relaying techniques considered in the paper