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Under the scenario of an underlay cognitive radio network, the authors propose in this paper an adaptive scheme using switched transmit diversity and adaptive modulation in order to minimize the average number of switched branches at the secondary transmitter while increasing the capacity of the secondary link. The proposed Switching Efficient Scheme (SES) uses the Scan and Wait (SWC) Combining technique where a transmission occurs only when a branch with an acceptable performance is found, otherwise data is buffered.
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