论文标题
反向散射通信的一般复合物值负载调制的通道容量
The Channel Capacity of General Complex-Valued Load Modulation for Backscatter Communication
论文作者
论文摘要
本文研究了反向散射通信系统的可实现信息率，该标签通过自由适应的被动终止执行负载调制。我们发现，标签电流的复杂相位限制为磁盘，因此可以在峰值限制的正交通道上以现有结果来描述容量问题。这使我们能够陈述载荷阻抗的通道容量和容量调整分布，这是由右半平面中的非浓度圆圈描述的。对于低SNR情况（SNR <4.8 dB），我们发现通道容量是通过纯反应载荷带有cauchy-distribed电抗的。该博览会基于一个系统模型，该系统模型将包括RFID在内的所有相关类别传播系统的所有相关类别。为了解决实用性，我们构建了一个符号字母，该字母允许在相当高的SNR下每个负载转换期的接近能力信息率超过6位。我们还发现，当对负载阻抗施加典型的价值范围约束时，速率几乎不会降低。
This paper studies achievable information rates of backscatter communication systems where the tag performs load modulation with a freely adaptable passive termination. We find that the complex phasor of the tag current is constrained to a disk and that the capacity problem can therefore be described with existing results on peak-power-limited quadrature channels. This allows us to state the channel capacity and the capacity-achieving distribution of the load impedance, which is described by non-concentric circles in the right half-plane. For the low-SNR case (SNR < 4.8 dB) we find that channel capacity is achieved by a purely reactive load with Cauchy-distributed reactance. The exposition is based on a system model that abstracts all relevant classes of backscatter communication systems, including RFID. To address practicality, we construct a symbol alphabet that allows for a near-capacity information rate of more than 6 bit per load-switching period at reasonably high SNR. We also find that the rate hardly decreases when typical value-range constraints are imposed on the load impedance.
