A Self-Interference-Cancelling Receiver for In-Band Full-Duplex Wireless with Low Distortion Under Cancellation of Strong TX Leakage

📋 论文概要

本文提出一种用于带内全双工无线通信的自干扰抵消接收机，解决了发射机泄露到接收机的强自干扰问题。该接收机在抵消强干扰的同时实现了低失真特性，从而支持同时同频的全双工通信。

💡 主要创新点

• 提出一种新型自干扰抵消架构，能够在接收机前端高效抑制来自发射机的强干扰信号。
• 通过优化电路设计，在强干扰抵消过程中保持低失真，提升接收机线性度和动态范围。

🏷 关键词

📄 原文摘要

In-band full-duplex (FD) wireless communication, i.e. simultaneous transmission and reception at the same frequency, in the same channel, promises up to 2x spectral efficiency, along with advantages in higher network layers [1]. The main challenge is dealing with strong in-band leakage from the transmitter to the receiver (i.e. self-interference (SI)), as TX powers are typically >100dB stronger than the weakest signal to be received, necessitating TX-RX isolation and SI cancellation. Performing this SI-cancellation solely in the digital domain, if at all possible, would require extremely clean (low-EVM) transmission and a huge dynamic range in the RX and ADC, which is currently not feasible [2]. Cancelling SI entirely in analog is not feasible either, since the SI contains delayed TX components reflected by the environment. Cancelling these requires impractically large amounts of tunable analog delay. Hence, FD-solutions

👥 作者与机构

Dirk-Jan van den Broek, Eric A. M. Klumperink, Bram Nauta

University of Twente, Enschede, The Netherlands