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This paper proposes and analyzes differential modulation schemes for two cooperation protocols in multi-node cooperative wireless networks; namely, multi-node Differential Amplify-and-Forward scheme (DiffAF) and multi-node Differential Decode-and-Forward scheme (DiffDF). In the DiffAF scheme, with knowledge of long-term average of received signals from all communication links, the destination efficiently combines signals from direct and all multiple-relay links to improve communication reliability. In the DiffDF scheme, by utilizing a decision threshold at each relay-destination link, the destination efficiently combines signals from the direct link and each relay link whose signal amplitude is larger than the threshold.
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