Optimal received SINR balancing based on cooperative beamforming in cognitive radio networks

What is it about?

In this paper, we investigate a two-step cooperative cognitive radio network, which consists of two secondary links, a number of relays, and one primary link. During the first step, the primary link is assumed to be idle; both secondary sources simultaneously broadcast their data to the relay network. During the second step, the relay network employs a proposed cooperative beamforming (CBF) scheme and transmits the received data toward both of the secondary destinations (no matter whether the primary link is idle or not). Previously, just one secondary link is active during two time slots. First, a SU source broadcasts the information to the relays. Second, the relays employ a BF method and retransmit the received version of the signal toward the SU destination.

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Why is it important?

We design an optimal BF vector of the relay network such that it can simultaneously activate two secondary links and balance the received SINR at the both secondary destinations. The proposed approach enables to simultaneously satisfy the QoS of the primary link and both secondary links.