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Cooperative communication is a bright technology to acquire diversity gain in wireless terminals by sharing their antennas. With the fixed amplify-and-forward (AF) mode, relay node always helps to relay the data of the source node with unchanged transmission power. Judging from the power efficiency, it is obviously not optimal, particularly when channel states are quite good. An adaptive AF mode is...
User Cooperation is a promising technology to obtain diversity gain at terminals. According to the traditional decode-and-forward scheme, relay node help to transmit source node's information with fixed number of modulation symbols all the time. It is not optimal in view of spectral efficiency, especially when the channel state is good. This paper introduces the adaptive DF scheme based on the minus...
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