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Abstract: We consider a cognitive radio scenario where a primary and a secondary userwish to communicate with their corresponding receivers simultaneously overfrequency selective channels. Under realistic assumptions that the secondarytransmitter has no side information about the primary-s message and eachtransmitter knows only its local channels, we propose a Vandermonde precoderthat cancels the interference from the secondary user by exploiting theredundancy of a cyclic prefix. Our numerical examples show that VFDM, with anappropriate design of the input covariance, enables the secondary user toachieve a considerable rate while generating zero interference to the primaryuser.



Author: L. S. Cardoso, M. Kobayashi, M. Debbah, O. Ryan

Source: https://arxiv.org/







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