论文标题
WIP：使用关键的TDD周转时间在SDR平台上实现无私的操作
WIP: Achieving Self-Interference-Free Operation on SDR Platform with Critical TDD Turnaround Time
论文作者
论文摘要
软件定义的无线电（SDR）平台对于需要实时适应性无线协议的研发活动或高端系统非常有价值。虽然可以使用最先进的SDR平台的专用数字处理单元来实现低潜伏期，但其射频（RF）前端通常会在周转时间（TT）方面限制，这是从接收模式转换为传输模式（或VICE FERSA）所需的时间。零中间频率（ZIF）收发器对SDR有利，但是即使设备当前未发送，也会受到自我干扰。时间划分双工（TDD）协议（例如Wi-Fi）的严格MAC层要求无法使用可配置的ZIF收发器来实现，而无需损害接收器的灵敏度。使用一种新颖的方法，我们表明使用AD9361 RF前端的TT可以低至640 ns，而自我干扰的水平与传统TDD模式达到的水平相同，而常规TDD模式的TT至少为55μs。与频脱双工（FDD）模式相比，在2.4 GHz频段中，接收器噪声底降低了约13 dB，在5 GHz频段中，接收器噪声板的减小约为4.5 dB。
Software Defined Radio (SDR) platforms are valuable for research and development activities or high-end systems that demand real-time adaptable wireless protocols. While low latency can be achieved using the dedicated digital processing unit of a state-of-the-art SDR platform, its Radio Frequency (RF) front-end often poses a limitation in terms of turnaround time (TT), the time needed for switching from the receiving to the transmitting mode (or vice versa). Zero Intermediate Frequency (ZIF) transceivers are favorable for SDR, but suffer from self-interference even if the device is not currently transmitting. The strict MAC-layer requirements of Time Division Duplex (TDD) protocols like Wi-Fi cannot be achieved using configurable ZIF transceivers without having to compromise receiver sensitivity. Using a novel approach, we show that the TT using the AD9361 RF front-end can be as low as 640 ns, while the self-interference is at the same level as achieved by the conventional TDD mode, which has a TT of at least 55 μs. As compared to Frequency Division Duplex (FDD) mode, a decrease of receiver noise floor by about 13 dB in the 2.4 GHz band and by about 4.5 dB in the 5 GHz band is achieved.
