dummy signal meaning in English

模拟信号
虚假信号
虚拟信号

Firstly , the steering vector of mainpath of desired user is estimated by using code filtering method , then dummy signals are introduced , main lobe of wave is built by using the steering vector of mainpath of desired user and side lobes is constrained by using dummy signals
该方法首先利用码滤波的方法估计期望用户主径的波达方向，然后引入虚拟信号，利用期望用户主径的波达方向形成波束的主瓣，并利用虚拟信号抑制旁瓣。