Abstract
In this paper, we study the problem of distributed relay beamforming for a bidirectional cognitive relay network which consists of two secondary transceivers and K cognitive relay nodes and a primary network with a transmitter and receiver, using underlay model. For effective use of spectrum, we propose a Multiple Access Broadcasting (MABC) two-way relaying scheme for cognitive networks. The two transceivers transmit their data towards the relays and then relays retransmit the processed form of signal towards the receiver. Our aim is to design the beamforming coefficients to maximize quality of service (QoS) for the secondary network while satisfying tolerable interference constraint for the primary network. We show that this approach yields a closed-form solution. Our simulation results show that the maximum achievable SINR improved while the tolerable interference temperature becomes not strict for primary receiver.
Highlights
With the explosive proliferation of wireless systems, the demand for radio spectrum has been increasing rapidly
The secondary users (SUs) are allowed to utilize the spectrum of the primary user (PU) only if the interference generated by the SUs at the primary receivers is below some acceptable threshold which is commonly known as interference temperature [2,4]
Our goal is to obtain beamforming coefficients of the secondary relays as the design parameters, such that the secondary network quality of service (QoS) measured by the signal-to-interference-plus-noise ratio (SINR) at the secondary destination is maximized while interference from secondary network to primary network is constrainted to a predefined value
Summary
With the explosive proliferation of wireless systems, the demand for radio spectrum has been increasing rapidly. There are three main cognitive radio network paradigms: underlay, overlay, and interweave [2]. The SUs are allowed to utilize the spectrum of the PU only if the interference generated by the SUs at the primary receivers is below some acceptable threshold which is commonly known as interference temperature [2,4]. This constraint limits the allowed transmit power of SUs and the QoS of the secondary network. In the overlay approach, the SU shares part of its power resources with the PU to provide a relay-assisted transmission
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