Riding on the primary: A new spectrum sharing paradigm for wireless-powered IoT devices
Riding on the primary: A new spectrum sharing paradigm for wireless-powered IoT devices
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DOI：
10.1109/icc.2017.7997001
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发表时间：
2017-05
期刊：
影响因子：
--
通讯作者：
Xin Kang;Ying-Chang Liang;Jing Yang
中科院分区：
文献类型：
--
作者：
Xin Kang;Ying-Chang Liang;Jing Yang
针对具有环境后向散射通信能力的无线供电物联网设备，提出了一种新的频谱共享模型--骑在主站上(ROP)。ROP的核心思想是从主信号中获取能量，然后将其信息比特调制到主信号中，并在不违反主系统的干扰要求的情况下将调制后的信号反射到副接收器。与传统的频谱共享模型相比，所提出的ROP中的二次系统不仅利用了主系统的频谱，而且利用主信号采集能量并携带其信息。本文研究了这种频谱共享系统在衰落信道下的性能。具体地说，我们通过联合优化主信号的发射功率和次环境后向散射的反射系数来最大化次系统的遍历容量。考虑了不同的(理想/实际)能耗模型、不同的(峰值/平均)发射功率约束、不同类型的(固定/动态可调)反射系数。对于每种场景，都得到了最优的功率分配和反射系数。
In this paper, a new spectrum sharing model referred to as riding on the primary (RoP) is proposed for wireless- powered IoT devices with ambient backscatter communication capabilities. The key idea of RoP is that the secondary transmitter harvests energy from the primary signal, then modulates its information bits to the primary signal, and reflects the modulated signal to the secondary receiver without violating the primary system's interference requirement. Compared with the conventional spectrum sharing model, the secondary system in the proposed RoP not only utilizes the spectrum of the primary system but also takes advantage of the primary signal to harvest energy and to carry its information. In this paper, we investigate the performance of such a spectrum sharing system under fading channels. To be specific, we maximize the ergodic capacity of the secondary system by jointly optimizing the transmit power of the primary signal and the reflection coefficient of the secondary ambient backscatter. Different (ideal/practical) energy consumption models, different (peak/average) transmit power constraints, different types (fixed/dynamically adjustable) reflection coefficient are considered. Optimal power allocation and reflection coefficient are obtained for each scenario.