Symbiotic Radio：面向未来无线网络的认知后向散射通信
Symbiotic Radio: Cognitive Backscattering Communications for Future Wireless Networks
摘要：
异构的无线业务和呈指数级增长的业务量要求新的频谱和能量高效的无线通信技术。在本文中，提出了一种新的技术，称为共生无线电（SR），利用认知无线电（CR）和环境后向散射通信（AmBC）的优点和解决的缺点，导致互惠频谱共享和高度可靠的后向散射通信。特别地，SR中的次发射机（STx）基于认知反向散射通信通过源自主发射机（PTx）的RF信号向次接收机（SRx）发送消息，因此次系统不仅与主系统共享无线电频谱，而且共享功率和基础设施。作为回报，辅传输向主系统提供有益的多径分集，因此两个系统形成互惠频谱共享。更重要的是，在SRx处利用联合解码来实现高度可靠的反向散射通信。为了充分利用SR的潜力，在本文中，我们解决了SR中的三个基本任务：（1）通过有源负载增强反向散射链路;（2）通过联合解码实现高度可靠的通信;（3）使用可重构智能表面捕获PTx的RF信号。新兴的应用，设计挑战和开放的研究问题也将被讨论。
英文摘要：
The heterogenous wireless services and exponentially growing traffic call for novel spectrum- and energy-efficient wireless communication technologies. In this paper, a new technique, called symbiotic radio (SR), is proposed to exploit the benefits and address the drawbacks of cognitive radio (CR) and ambient backscattering communications(AmBC), leading to mutualism spectrum sharing and highly reliable backscattering communications. In particular, the secondary transmitter (STx) in SR transmits messages to the secondary receiver (SRx) over the RF signals originating from the primary transmitter (PTx) based on cognitive backscattering communications, thus the secondary system shares not only the radio spectrum, but also the power, and infrastructure with the primary system. In return, the secondary transmission provides beneficial multipath diversity to the primary system, therefore the two systems form mutualism spectrum sharing. More importantly, joint decoding is exploited at SRx to achieve highly reliable backscattering communications. To exploit the full potential of SR, in this paper, we address three fundamental tasks in SR: (1) enhancing the backscattering link via active load; (2) achieving highly reliable communications through joint decoding; and (3) capturing PTx's RF signals using reconfigurable intelligent surfaces. Emerging applications, design challenges and open research problems will also be discussed.
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