In this paper, we optimize both harvesting and sensing durations for cognitive radio networks (CRNs). There are a primary source and destination $$P_S$$ P S and $$P_D$$ P D . In the secondary network, there are a secondary source and destination $$S_S$$ S S and $$S_D$$ S D . There are three time slots in secondary network. In the first one, secondary source $$S_S$$ S S harvests energy from radio frequency (RF) signal received from another node A . Node A can be a base station or any other node transmitting RF signal. In the second time slot, secondary source senses the channel using the energy detector to detect primary source activity. When $$P_S$$ P S is idle, the secondary source transmits data to secondary destination $$S_D$$ S D in the last time slot. We optimize harvesting and sensing durations to maximize the throughput. Our results are valid for quadrature amplitude modulation (QAM), phase shift keying (PSK) and amplitude shift keying (ASK) in the presence of Rayleigh or Nakagami fading channels.

中文翻译：

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认知无线电网络的最佳采集和感知持续时间

在本文中，我们优化了认知无线电网络 (CRN) 的采集和感知持续时间。有一个主要的来源和目的地 $$P_S$$ PS 和 $$P_D$$ PD 。在二级网络中，有二级源和目标 $$S_S$$ SS 和 $$S_D$$ SD 。二级网络有三个时隙。在第一个中，辅助源 $$S_S$$ SS 从从另一个节点 A 接收到的射频 (RF) 信号中收集能量。节点 A 可以是基站或任何其他发射射频信号的节点。在第二个时隙中，辅助源使用能量检测器来检测主源活动来检测信道。当$$P_S$$PS空闲时，次要源在最后一个时隙向次要目的地$$S_D$$SD传输数据。我们优化收获和传感持续时间以最大化吞吐量。