Cooperative Decode-and-Forward Relaying for Secondary Spectrum Access
Cooperative Decode-and-Forward Relaying for Secondary Spectrum Access
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DOI：
10.1109/twc.2009.081484
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发表时间：
2009-10-01
影响因子：
10.4
通讯作者：
Ting, See Ho
中科院分区：
文献类型：
--
作者：
Han, Yang;Pandharipande, Ashish;Ting, See Ho
我们提出了一种基于协作解码和转发中继的两阶段协议，用于辅助系统与主系统一起实现频谱访问。主系统和辅助系统分别由发射器-接收器对 PT-PR 和 ST-SR 组成。在第一个传输阶段，PT 将主信号传输到 PR，该信号也被 ST 和 SR 接收并在其中进行解码。在 ST，通过将可用功率的分数 α 和 (1 - α) 分别分配给主信号和辅助信号，主信号被重新生成并与辅助信号线性组合。然后 ST 在第二个传输阶段广播该组合信号。我们表明，只要 ST 位于距 PT 的临界半径内，就存在 α 阈值，高于该阈值时主系统的中断概率将等于或低于没有频谱共享的情况。我们还确定了辅助系统实现的中断概率。理论和仿真结果证实了所提出的频谱共享方案的效率。
We propose a two-phase protocol based on cooperative decode-and-forward relaying for a secondary system to achieve spectrum access along with a primary system. The primary and secondary systems comprise of a transmitter-receiver pair, PT-PR and ST-SR, respectively. In the first transmission phase, PT transmits the primary signal to PR, which is also received by ST and SR, where it is decoded. At ST, the primary signal is regenerated and linearly combined with the secondary signal by assigning fractions alpha and (1 - alpha) of the available power to the primary and secondary signals respectively. This combined signal is then broadcasted by ST in the second transmission phase. We show that as long as ST is located within a critical radius from PT, there exists a threshold value for alpha above which the outage probability of the primary system will be equal to or lower than the case without spectrum sharing. We also determine the outage probability achieved by the secondary system. Theoretical and simulation results confirm the efficiency of the proposed spectrum sharing scheme.