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首页> 外文期刊>IEEE systems journal >Full-Duplex Relaying Cognitive Radio Network With Cooperative Nonorthogonal Multiple Access
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Full-Duplex Relaying Cognitive Radio Network With Cooperative Nonorthogonal Multiple Access

机译：具有非正交多址协作的全双工中继认知无线电网络

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摘要

This paper proposes a cooperative nonorthogonal multiple access (CNOMA) scheme in a full-duplex (FD) relaying cognitive radio network (CRN), where a primary user (PU) communicates with the base station under the assistance of a secondary user (SU), in order to sufficiently utilize both idle and underutilized spectrum resources. When the PU does not exist, the SU identifies this idle licensed spectrum band by spectrum sensing and occupies it so that the waste of spectrum hole resource is avoided. When the PU exists, it allows the SU to share its spectrum band by NOMA to further increase the spectrum efficiency. By adopting FD mode, the proposed FD CNOMA scheme not only achieves better system performance than half-duplex mode by receiving and transmitting simultaneously, but also overcomes inherent issues of conventional CRNs. To characterize the performance of the proposed scheme, expressions of exact and asymptotic ergodic rates and system throughput are worked out. Accordingly, the high signal-to-noise ratio slopes for these ergodic rates are further derived. Simulation results verify the correctness of all these derivation results. They also illustrate that FD CNOMA outperforms other cooperative benchmarks in real-world scenarios in terms of both ergodic rates and system throughput.
机译：本文提出了一种在全双工（FD）中继认知无线电网络（CRN）中的协作非正交多址（CNOMA）方案，其中主要用户（PU）在辅助用户（SU）的帮助下与基站进行通信，以便充分利用空闲和未充分利用的频谱资源。当PU不存在时，SU通过频谱感知来识别该空闲的许可频谱带并将其占用，从而避免了频谱孔资源的浪费。当PU存在时，它允许SU通过NOMA共享其频谱带，从而进一步提高频谱效率。通过采用FD模式，提出的FD CNOMA方案不仅可以通过同时接收和发送来获得比半双工模式更好的系统性能，而且还克服了常规CRN的固有问题。为了表征所提出的方案的性能，计算出精确的和渐近的遍历率以及系统吞吐量的表达式。因此，进一步得出了这些遍历速率的高信噪比斜率。仿真结果验证了所有这些推导结果的正确性。他们还说明，FD CNOMA在遍历速率和系统吞吐量方面在实际情况中均优于其他合作基准。

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