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In this letter, we propose a cooperative spectrum sharing protocol, where both primary users (PUs) and secondary users (SUs) achieve bidirectional transmission. In particular, the SUs help PUs to achieve their bidirectional target rates through orthogonal frequency division multiplexing two-way relaying. In return, the PUs allow SUs to communicate bidirectionally on a subset of subcarriers. Subcarrier...
In this paper we proposed a cooperative spectrum sharing protocol with two-way decode-and-forward (DF) relaying. Specifically, two primary users A and B communicate with each other with the assistant of the secondary user S. The secondary user uses a fraction of power to forward the primary signals by acting as a DF relay. As a reward, the secondary user can gain spectrum access by using the remaining...
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