Abstract
An optically-enabled radio frquency (RF) self-interference cancellation system is demonstrated for over-the-air in-band full duplex transmission, based on a signal-of-interest (SOI) driven regular triangle algorithm. Since the goal of a self-interference cancellation system is to retrieve the SOI that is masked by the in-band interference signal, using the SOI quality as the driven parameter for optimizing the self-interference cancellation performance is a natural and effective way to allow the system to adapt to changes and obtain the best cancellation performance. Since regular triangle algorithm has short iteration time, bursts of pseudo-random binary sequence would be used between real data transmission for optimizing the self-interference cancellation performance. The adaptive regular triangle algorithm optimizes the cancellation setting such that the in-band interference can be cancelled to a minimum, i.e., down to the noise floor. During the over-the-air experiment, 22 dB of cancellation depth is obtained over a 300 MHz bandwidth at 18.35 GHz without the need of digital self-interference cancellation.
© 2020 Optical Society of America
Full Article | PDF ArticleMore Like This
Zhiyi Zhang, Lizhuo Zheng, Shilin Xiao, Zhiyang Liu, Jiafei Fang, and Weisheng Hu
Opt. Lett. 46(5) 1069-1072 (2021)
Lizhuo Zheng, Zhiyang Liu, Shilin Xiao, Mable P. Fok, Zhiyi Zhang, and Weisheng Hu
Opt. Lett. 45(23) 6382-6385 (2020)
Lizhuo Zheng, Yunhao Zhang, Shilin Xiao, Lin Huang, Jiafei Fang, and Weisheng Hu
Opt. Express 27(4) 4116-4125 (2019)