Polarization-based optimal detection scheme for digital self-interference cancellation in full-duplex system

doi:10.19682/j.cnki.1005-8885.2020.0018

中国邮电高校学报(英文) ›› 2020, Vol. 27 ›› Issue (3): 73-82.doi: 10.19682/j.cnki.1005-8885.2020.0018

Polarization-based optimal detection scheme for digital self-interference cancellation in full-duplex system

ADIL KHAN¹,张金玲¹,Muhammad Ayzed Mirza¹,²,Sibghat Ullah¹,²,Erum Abbasi¹,²,Babar Hayat¹,²

1. 北京邮电大学
2.

收稿日期:2019-10-09 修回日期:2020-04-11 出版日期:2020-06-24 发布日期:2020-08-30
通讯作者: ADIL KHAN E-mail:adilkhan877@yahoo.com
基金资助:
中央高校基本科研业务费专项资金资助;国家自然科学基金资助项目

Polarization-based optimal detection scheme for digital self-interference cancellation in full-duplex system

Received:2019-10-09 Revised:2020-04-11 Online:2020-06-24 Published:2020-08-30
Contact: ADIL KHAN E-mail:adilkhan877@yahoo.com
Supported by:
Fundamental?Research Funds for the Central Universities;National Natural Science Foundation of China

摘要/Abstract

摘要： In order to detect and cancel the self-interference (SI) signal from desired binary phase-shift keying (BPSK) signal, the polarization-based optimal detection (POD) scheme for cancellation of digital SI in a full-duplex (FD) system is proposed. The POD scheme exploits the polarization domain to isolate the desired signal from the SI signal and then cancel the SI to obtain the interference-free desired signal at the receiver. In FD communication, after antenna and analog cancellation, the receiver still contains residual SI due to non-linearities of hardware imperfections. In POD scheme, a likelihood ratio expression is obtained, which isolates and detects SI bits from the desired bits. After isolation of these signal points, the POD scheme cancels the residual SI. As compared to the conventional schemes, the proposed POD scheme gives significantly low bit error rate (BER), a clear constellation diagram to obtain the boundary between desired and SI signal points, and increases the receiver's SI cancellation performance in low signal to interference ratio (SIR) environment.

关键词: polarization, full-duplex, self-interference cancellation, optimal detection

Abstract: In order to detect and cancel the self-interference (SI) signal from desired binary phase-shift keying (BPSK) signal, the polarization-based optimal detection (POD) scheme for cancellation of digital SI in a full-duplex (FD) system is proposed. The POD scheme exploits the polarization domain to isolate the desired signal from the SI signal and then cancel the SI to obtain the interference-free desired signal at the receiver. In FD communication, after antenna and analog cancellation, the receiver still contains residual SI due to non-linearities of hardware imperfections. In POD scheme, a likelihood ratio expression is obtained, which isolates and detects SI bits from the desired bits. After isolation of these signal points, the POD scheme cancels the residual SI. As compared to the conventional schemes, the proposed POD scheme gives significantly low bit error rate (BER), a clear constellation diagram to obtain the boundary between desired and SI signal points, and increases the receiver's SI cancellation performance in low signal to interference ratio (SIR) environment.

Key words: polarization, full-duplex, self-interference cancellation, optimal detection

参考文献 25

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Polarization-based optimal detection scheme for digital self-interference cancellation in full-duplex system

Polarization-based optimal detection scheme for digital self-interference cancellation in full-duplex system

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