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首页> 外文期刊>Communications, IET >Performance evaluation of underlay cognitive hybrid satellite–terrestrial relay networks with relay selection scheme
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Performance evaluation of underlay cognitive hybrid satellite–terrestrial relay networks with relay selection scheme

机译：基于中继选择方案的地下认知混合星地中继网络性能评估

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The applicability of cognitive radio (CR) techniques into satellite communications has received considerable attention in recent years. This study considers the integration of relay transmission into CR-based satellite terrestrial network, which offers the advantages of not only increasing the overall spectral efficiency by spectrum sharing but also extending the wireless coverage through the deployment of relays. Specifically, the authors derive the exact closed-form expression of the outage probability (OP) for the cognitive network, which provide an efficient means to evaluate the impact of key parameters on the system performance. Furthermore, the asymptotic OP expression at high signal-to-noise ratio is presented, which reveals the achievable diversity order and coding gain of the considered network. Finally, numerical results are carried out to validate the theoretical results, and shows that although a higher transmit power or weaker shadowing severity of the satellite interference link has a severe detrimental impact on the outage performance of the cognitive network by reducing the coding gain, the achievable diversity order only depends on the fading severities and the number of relays of the cognitive network.
机译：近年来，认知无线电（CR）技术在卫星通信中的应用受到了广泛的关注。这项研究考虑了将中继传输集成到基于CR的卫星地面网络中，这不仅具有通过频谱共享提高整体频谱效率的优势，而且还通过中继的部署扩展了无线覆盖范围。特别是，作者得出了认知网络中断概率（OP）的精确封闭形式，这为评估关键参数对系统性能的影响提供了一种有效的方法。此外，提出了在高信噪比下的渐近OP表达式，揭示了所考虑网络的可实现分集阶数和编码增益。最后，通过数值结果验证了理论结果，结果表明，尽管较高的发射功率或较弱的卫星干扰链路阴影严重性通过降低编码增益对认知网络的中断性能产生了严重的不利影响，但可达到的多样性等级仅取决于衰落的严重程度和认知网络的中继数量。

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