Multi-hop cognitive radio networking through beamformed underlay secondary access

Auon Akhtar, Luca Di Nardis, Mohammad Nakhai, Oliver Holland, M. -G. Di Benedetto, Abdol-Hamid Aghvami

Research output: Chapter in Book/Report/Conference proceedingConference paper

5 Citations (Scopus)


The paper introduces a transmit beamforming strategy taking into account the positions of primary, secondary victim and intended secondary receivers, to achieve underlay secondary access in multihop cognitive radio networking. The transmit beamforming strategy is used to define a novel path optimization scheme that deviates from a preselected path given by the routing module, based on local information and according to a relay selection metric. This metric is designed to improve both coexistence with primary/secondary victim receivers and performance of the secondary cognitive network. Simulations compare the proposed strategy with a baseline solution that does not adopt beamforming, and with a strategy that applies beamforming on each hop without modifying the original path. Results show that the proposed strategy is capable of improving coexistence with primary/secondary victims, and highlight that a trade-off exists between the meeting of coexistence constraints and maximisation of secondary network performance.
Original languageEnglish
Title of host publication2013 IEEE International Conference on Communications (ICC)
Place of PublicationBudapest, Hungary
Number of pages6
Publication statusPublished - 2013


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