Recent studies on multiplexing concept over beamspace multiple-input-multiple-output (MIMO) can reduce the need for using phase shifters while keeping the directivity performance at similar levels. Thus, beamspace MIMO provides cost-effective and simple hardware designs for millimeter-wave (mmWave) systems. However, the number of users/streams that can be supported at the same time-frequency resource is limited to the number of radio-frequency (RF) chains. In this letter, to overcome this restriction, dynamic sidelobe multiplexing (DSM) algorithm is proposed. The proposed multiplexing technique precodes the transmitted data over transmitter beams in order to open up a new path to the receiver. Therefore, the proposed method provides an opportunity to exceed the limits of conventional hardware usage in beamspace MIMO. The numerical results show that the proposed approach enhance the system performance for more than 50% compared to conventional beamspace MIMO techniques.

中文翻译：

---

波束空间 MIMO 系统中的动态旁瓣复用

最近对波束空间多输入多输出 (MIMO) 上的复用概念的研究可以减少使用移相器的需要，同时将方向性性能保持在相似的水平。因此，波束空间 MIMO 为毫米波 (mmWave) 系统提供了经济高效且简单的硬件设计。但是，同一时频资源所能支持的用户/流数量受限于射频（RF）链的数量。在这封信中，为了克服这个限制，提出了动态旁瓣复用 (DSM) 算法。所提出的复用技术对通过发射器波束传输的数据进行预编码，以便开辟一条通往接收器的新路径。因此，所提出的方法提供了超越波束空间 MIMO 中传统硬件使用限制的机会。