Literature survey for Decoder Performance Analysis of Relay Based Decode-and-Forward Cooperative Diversity Network

--Performance degradation is an major problem in a relay based Decode-and-Forward (DF) receiving cooperative system. In the DF protocol , existing decoder performances have high decoding complexity, because destination require exact knowledge of the sourcerelay link along with the channel coefficient of source-destination and relay –destination links. In the proposed method, degradation can be avoided by using Maximum-likelihood(ML) decoder at destination, assuming that average probability of error of source-relay link known to destination. Since average probability of error is a function of the average SNR, the proposed ML decoder avoids the need of exact knowledge of the channel coefficient of the sourcerelay link in the destination node. PL decoder is also used which performance is similar to ML decoder with low decoding complexity. This literature survey discuss about DF protocol based relay strategies and their performance. Keywords-Decode-and-Forward protocol, Cooperative diversity, ML