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A relay-aided cooperative underlay cognitive radio system with an interference constraint at the primary receiver (PR) is considered. When the primary user (PU) is active, those secondary users (SUs) whose interference at the PR is above a threshold will amplify-and-forward PU's signal to enhance the PU’s performance, and those SUs below this threshold will proceed with their own transmission in an...
A relay-aided cooperative underlay cognitive radio system with random number of secondary users (SU), and an interference constraint at the primary receiver (PR) is considered. When the primary (PU) is active, those SUs whose interference at the PR is above a threshold will amplify-and-forward PU's signal to enhance the PU's performance, and those SUs below this threshold will proceed with their own...
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