Cooperative beamforming in cognitive radio networks

What is it about?

In this paper, a novel beamforming method is proposed for a more realistic cognitive radio system with several secondary transmitters and receivers, a number of relays, and 1 primary transmitter and receiver. When the primary user link is idle, all secondary transmitters access temporal spectrum holes to simultaneously broadcast their information to the relays each associated with an infinite buffer. In the next stage, the relays transmit the information to the secondary receivers using a cooperative beamforming method no matter whether primary user link is silent or not. In the previous works, only a secondary link, a primary link, and several SUs as relays were considered.

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Why is it important?

The investigated model provided the possibility that the CR network could efficiently utilize both temporal and spatial spectrumholes.Accordingly, the performance of the opportunistic spectrum access could be highly improved. We analyzed the performance of the proposed approach in terms of quality of channels, received SINR at the PU and SU receivers, number of relays, number of SU links, and received interference plus noise power at the PU receiver.