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A Bandwidth-Efficient Cognitive Radio With Two-Path Amplify-and-Forward Relaying

机译:具有两径放大转发中继功能的高效带宽认知无线电

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This letter introduces a new cognitive radio system employing the two-path amplify-and-forward relaying scheme. In the proposed system, the primary user (PU) transmitter cooperates with the secondary user (SU) transmitter and receiver to relay PU data to the PU destination. The proposed algorithm makes use of the interrelay interference (IRI) between the two relay nodes to transmit SU data and minimize their IRI effect on the PU destination. Two optimization problems are formulated to find optimal power allocation between SU transmission and relaying amplifying factors: one to minimize the probability of error and the other one to maximize the average achievable rate. Simulation results show that the proposed algorithm outperforms the single data transmission and the existing two-path relaying scheme. In addition, the PU network achieves a diversity order of 3, when a maximum-likelihood decoder is used, whereas the SU network achieves a diversity order of 2.
机译:这封信介绍了一种采用两径放大转发中继方案的新型认知无线电系统。在所提出的系统中,主要用户(PU)发射器与次要用户(SU)发射器和接收器协作以将PU数据中继到PU目的地。所提出的算法利用两个中继节点之间的中继干扰(IRI)来传输SU数据,并将其IRI对PU目的地的影响降至最低。提出了两个优化问题,以找到SU传输和中继放大因子之间的最佳功率分配:一个最小化错误的概率,另一个最大化平均可达到的速率。仿真结果表明,该算法优于单数据传输和现有的两路径中继方案。此外,当使用最大似然解码器时,PU网络的分集阶数为3,而SU网络的分集阶数为2。

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