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In this work, we propose a novel partial compress-and-forward (PCF) schemefor improving the maximum achievable transmission rate of a diamond relaynetwork with two noisy relays. PCF combines conventional compress-and-forward(CF) and amplify-and-forward (AF) protocols, enabling one relay to operatealternately in the CF or the AF mode, while the other relay works purely in theCF mode. As the direct link from the source to the destination is unavailable,and there is no noiseless relay in the diamond network, messages received fromboth relays must act as side information for each other and must be decodedjointly. We propose a joint decoder to decode two Luby transform (LT) codesreceived from both relays corresponding to the same original message. Numericalresults show that PCF can achieve significant performance improvements comparedto decode-and-forward (DF) and pure CF protocols when at least the channelsconnected to one of the relays are of high quality.

A Partial Compress-and-Forward Strategy for Relay-assisted Wireless Networks Based on Rateless Coding