A 1.7-to-2.2GHz Full-Duplex Transceiver System with >50dB Self-Interference Cancellation over 42MHz Bandwidth

📋 论文概要

本文提出一个工作于1.7-2.2GHz的全双工收发系统，能够实现42MHz带宽内超过50dB的自干扰抑制。解决了全双工通信中强发射信号耦合到接收机导致干扰的难题。

💡 主要创新点

• 采用多级主动自干扰消除技术，在射频和模拟域联合抵消，实现宽带高抑制比。
• 优化收发机前端线性度与噪声性能，在保证高抑制的同时避免噪声恶化或功耗过高。
• 集成完整的收发链路线路，验证了全双工系统在移动通信频段的可行性。

🏷 关键词

📄 原文摘要

Full-duplex (FD) radio communication potentially doubles the spectral efficiency in the densely occupied RF spectrum (100MHz to 5GHz). However, significant challenges remain, particularly the presence of a strong transmitter (TX) selfinterference (SI) coupling to the receiver (RX). Numerous recent efforts on mitigating SI have focused on using active cancellation techniques [1-5]. However, these methods are challenged by either a degradation in noise performance [2], high power consumption [1,4], large silicon area [5], the inability to adequately cancel a high-output-power TX signal [3-4], or achieve a relatively narrow cancellation bandwidth [3,5]. Moreover, other sources of SI are presented to the RX, including the effects of 1) in-band TX thermal noise, which can exceed the RX noise floor, 2) the RX LO phase noise (PN), which reciprocally mixes with SI, further degrading the C/I ratio. This paper presents several circuit-level

👥 作者与机构

Tong Zhang, Ali Najafi, Chenxin Su, Jacques C. Rudell

University of Washington, Seattle, WA