论文标题
增强使用连贯和非连接的时空代码的环境反向散射通信
Enhancing Ambient Backscatter Communication Utilizing Coherent and Non-Coherent Space-Time Codes
论文作者
论文摘要
环境反向散射通信（AMBC）利用现有的环境射频（RF）环境来实施与无电池设备的通信。 AMBC开发的主要挑战是由AMBC标签反向散射的非常弱的RF信号。为了克服这一挑战，我们建议通过在标签和读取器中合并多个天线来使用正交时空块代码（OSTBC）。我们的方法考虑了连贯和非固定的OSTBC，因此可以考虑有或没有通道状态信息的系统。为了应用OSTBC，我们为AMBC系统开发了一个近似线性化和归一化的多输入多输出（MIMO）通道模型。对于多种有用的工作条件，该MIMO通道模型被证明是准确的。还基于提出的AMBC通道模型提供了两个相干检测器和一个非连锁检测器。仿真结果表明，可以实现增强的位错误率性能，这表明在标签和读取器上使用多个天线的好处。
Ambient backscatter communication (AmBC) leverages the existing ambient radio frequency (RF) environment to implement communication with battery-free devices. The key challenge in the development of AmBC is the very weak RF signals backscattered by the AmBC Tag. To overcome this challenge, we propose the use of orthogonal space-time block codes (OSTBC) by incorporating multiple antennas at the Tag as well as at the Reader. Our approach considers both coherent and non-coherent OSTBC so that systems with and without channel state information can be considered. To allow the application of OSTBC, we develop an approximate linearized and normalized multiple-input multiple-output (MIMO) channel model for the AmBC system. This MIMO channel model is shown to be accurate for a wide range of useful operating conditions. Two coherent detectors and a non-coherent detector are also provided based on the proposed AmBC channel model. Simulation results show that enhanced bit error rate performance can be achieved, demonstrating the benefit of using multiple antennas at the Tag as well as the Reader.
