Self-interference cancelation in the presence of non-linear power amplifier and receiver IQ imbalance

Visa Tapio,Markku Juntti,Marko Sonkki

doi:10.1186/s13638-020-01743-z

Abstract

In the in-band full-duplex(FD) systems, the self-interference (SI) power can be more than 100 dB higher than the power of the received data signal. In order to enable the FD transmission, several SI cancelation stages are needed in a FD transceiver. By combining the cancelation at the radio frequency (RF) with a specially designed antenna and cancelation circuitry and SI cancelation at the digital baseband, the required level of SI cancelation can be achieved even with a non-linear power amplifier. In this paper, a FD transceiver architecture is modeled with simulation tools that allow to use realistic antenna and analog transceiver models and at the same time enable algorithm studies. The analog SI cancelation at the RF is controlled by the baseband digital processing unit, and the tuning of the RF canceler is performed with an automatic gain control enhanced iterative algorithm. The combined cancelation performance of the antenna and RF canceler varies between 62 and 82 dB depending on the studied cases. The digital baseband SI cancelation is based on the Hammerstein model in order to take the power amplifier non-linearity into account. The coefficients of the Hammerstein model are estimated with a self-orthogonalizing adaptive algorithm. When realistic phase noise and IQ imbalance values are taken into account, the SI after all the cancelation stages can decrease the signal-to-interference-and-noise-ratio (SINR) by few decibels (dB). In order to further enhance the SI cancelation, the Hammerstein based SI canceler is extended to cancel also the effect of the receiver IQ imbalance. With the extended baseband canceler, the cancelation performance is mainly limited by the phase noise

Highlights

In the in-band full-duplex (FD) transmission, the same carrier frequency is simultaneously used to transmit and receive data signals with the same transceiver
When the nodes are operating in the FD mode, the link capacity is affected by the residual SI after the cancelation, the pilot overhead needed for the SI cancelation at the digital baseband, and the time needed to tune the radio frequency (RF) canceler and estimate the SI channel
A FD transceiver architecture, where SI cancelation is performed with three different techniques, (1) antenna isolation, (2) SI canceler operating at RF, and (3) digital SI cancelation at the baseband unit, was modeled

Summary

Introduction

In the in-band full-duplex (FD) transmission, the same carrier frequency is simultaneously used to transmit and receive data signals with the same transceiver. When the nodes are operating in the FD mode, the link capacity is affected by the residual SI after the cancelation, the pilot overhead needed for the SI cancelation at the digital baseband, and the time needed to tune the RF canceler and estimate the SI channel. The tuning of the RF canceler as well as the baseband SI channel estimation can be performed using a training signal or in the HD mode using the transmitted data signal. If the HD mode requires the usage of additional FD specific pilots for SI channel estimation in digital baseband SI cancelation, the capacity is further reduced by the factor κFD. SINR terms (γ1, γ2) include the thermal noise and residual SI after the SI cancelation

Numerical results

Findings

Discussion and conclusion