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In this paper, the authors propose a power allocation method for the direct/cooperative Amplify-and-Forward (AF) relay switched SC-FDMA using Spectrum Division/Adaptive Subcarrier Allocation (SDASA). The cooperative relaying is used only when it can achieve higher channel capacity than the direct communication. In the proposed power allocation method, transmit power is adaptively allocated to Mobile Terminal (MT) and Relay Station (RS) according to the channel conditions of MTRS link and RS-Base Station (BS) link when the use of cooperative relay is selected.
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