Design of a passive self-interference cancellation network with high cancellation ratio

Jinxin Li, Shiwen Yang, Z. Nie
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引用次数: 2

Abstract

A passive self-interference cancellation network (SICN) is proposed in this paper. The network is composed of three directional couplers and microstrip delay lines. By adjusting the coupling factor of the two parallel coupled line directional couplers and the length of the delay lines, the proposed SICN is able to produce an optimized reference signal with approximate equal amplitude and 180° phase difference to the self-interference signal (SIS), and the cancellation of SIS is thus achieved. Numerical simulation results of the proposed network shows a better reflection coefficient level less than -23 dB over the LTE band of 2.5GHz - 2.57GHz. The cancellation ratio is more than 12dB, while the insertion loss of receive channel is about 0.12dB. Another numerical example for the band of 2.62GHz - 2.69GHz is also simulated and discussed. Details of the proposed cancellation network designs are described and the simulated results are presented and discussed.
高对消比无源自干扰对消网络的设计
提出了一种无源自干扰消除网络(SICN)。该网络由三个定向耦合器和微带延迟线组成。通过调整两个平行耦合线定向耦合器的耦合系数和延迟线的长度,所提出的SICN能够产生与自干扰信号(SIS)幅值近似相等、相位差为180°的优化参考信号,从而实现自干扰信号的消除。数值仿真结果表明,该网络在2.5GHz ~ 2.57GHz LTE频段上的反射系数水平小于-23 dB。对消比大于12dB,而接收信道的插入损耗约为0.12dB。本文还对2.62GHz ~ 2.69GHz频段的另一个数值算例进行了仿真和讨论。详细描述了所提出的对消网络设计,并给出了仿真结果并进行了讨论。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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