In this work, we exploit the radar clutter (i.e., the ensemble of echoes generated by the terrain and/or the surrounding objects in response to the signal emitted by a radar transmitter) as a carrier signal to enable an ambient backscatter communication from a source (tag) to a destination (reader). The proposed idea relies on the fact that, since the radar excitation is periodic, the radar clutter is itself periodic over time scales shorter than the coherence time of the environment. Upon deriving a convenient signal model, we propose two encoding/decoding schemes that do not require any coordination with the radar transmitter or knowledge of the radar waveform. Different tradeoffs in terms of transmission rate and error probability can be obtained upon changing the control signal driving the tag switch or the adopted encoding rule; also, multiple tags can be accommodated with either a sourced or an unsourced multiple access strategy. Some illustrative examples are provided.

翻译：在这项工作中,我们利用雷达阵列(即地形和(或)周围物体响应雷达发射机发出的信号而产生的回声集合)作为载体信号,使环境从源(轮胎)向目的地(阅读器)进行反向散射通信。提议的想法基于以下事实,即由于雷达引力是定期的,雷达阵列本身的时间间隔比环境的一致性时间短。在得出一个方便的信号模型时,我们提议两种编码/解码计划,不需要与雷达发射机或雷达波形知识进行任何协调。在改变驱动标记转换的控制信号或采用编码规则时,可以取得传输速度和误差概率的不同权衡;此外,可以通过源码或无源的多重访问战略来容纳多个标记。我们提供了一些示例。