Ambient Backscatter: A New Approach to Improve Network Performance for RF-Powered Cognitive Radio Networks
Ambient Backscatter: A New Approach to Improve Network Performance for RF-Powered Cognitive Radio Networks
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DOI：
10.1109/tcomm.2017.2710338
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发表时间：
2017-09-01
影响因子：
8.3
通讯作者：
Han, Zhu
中科院分区：
文献类型：
--
作者：
Dinh Thai Hoang;Niyato, Dusit;Han, Zhu
本文介绍了一种新的解决方案，可提高射频 (RF) 供电的认知无线电网络 (CRN) 中辅助系统的性能。在传统的射频供电 CRN 中，辅助系统基于“收获然后传输”协议工作。也就是说，辅助发射器 (ST) 从主信号中收集能量，然后使用所收集的能量将数据传输到其辅助接收器 (SR)。然而，使用该协议，辅助系统的性能在很大程度上取决于所收集的能量的量以及主通道活动，例如空闲和繁忙时段。最近，引入了环境反向散射通信，它使得 ST 能够通过反向散射环境信号向 SR 传输数据。因此，它有可能在射频供电的 CRN 中得到采用。我们研究了具有环境反向散射通信的射频供电 CRN 在两种场景（即覆盖 CRN 和底层 CRN）下的性能。对于每个场景，我们制定并解决优化问题，以最大化辅助系统的整体传输速率。数值结果表明，通过结合这两种技术，与ST执行收获然后传输或环境反向散射技术的情况相比，二次系统的性能可以得到显着提高。
This paper introduces a new solution to improve the performance for secondary systems in radio frequency (RF) powered cognitive radio networks (CRNs). In a conventional RF-powered CRN, the secondary system works based on the harvest-then-transmit protocol. That is, the secondary transmitter (ST) harvests energy from primary signals and then uses the harvested energy to transmit data to its secondary receiver (SR). However, with this protocol, the performance of the secondary system is much dependent on the amount of harvested energy as well as the primary channel activity, e.g., idle and busy periods. Recently, ambient backscatter communication has been introduced, which enables the ST to transmit data to the SR by backscattering ambient signals. Therefore, it is potential to be adopted in the RF-powered CRN. We investigate the performance of RF-powered CRNs with ambient backscatter communication over two scenarios, i.e., overlay and underlay CRNs. For each scenario, we formulate and solve the optimization problem to maximize the overall transmission rate of the secondary system. Numerical results show that by incorporating such two techniques, the performance of the secondary system can be improved significantly compared with the case when the ST performs either harvest-then-transmit or ambient backscatter technique.