With the growth of wireless data traffic, additional spectrum is required to meet consumer demands. Consequently, innovative approaches are needed for efficient management of the available limited spectrum. To double the achievable spectral efficiency, a transceiver can be designed to receive and transmit signals simultaneously (STAR) across the same frequency band. However, due to the coupling of the high power transmitted signal into the collocated receiver, the receiver’s performance is degraded. For successful STAR realization, the coupled high-power transmit (Tx) signal should be suppressed by 100-120 dB over the entire operational bandwidth. So far, most STAR implementations are narrowband, and not useful for ultra wideband (UWB) communications. In this paper, we present a review of novel approaches employed to achieve improved cancellation across wide bandwidths in RF and propagation domains. Both single and multi-antenna systems are considered. Measurements show an average cancellation of 50 dB using two stages of RF signal cancellation.

中文翻译：

---

在RF域中实现高隔离度以同时进行发送和接收的技术

随着无线数据流量的增长，需要更多频谱来满足消费者需求。因此，需要创新的方法来有效管理可用的有限频谱。为了使可实现的频谱效率提高一倍，可以将收发器设计为在同一频带上同时接收和发送信号（STAR）。但是，由于高功率发射信号耦合到并置的接收器中，所以接收器的性能下降。为了成功实现STAR，应在整个工作带宽上将耦合的高功率发射（Tx）信号抑制100-120 dB。到目前为止，大多数STAR实现都是窄带的，对于超宽带（UWB）通信没有用。在本文中，我们介绍了一种新颖的方法，该方法用于在RF和传播域的宽带宽范围内实现改进的抵消。同时考虑了单天线系统和多天线系统。测量表明，使用两个阶段的射频信号消除可以平均消除50 dB。