Simultaneous RF signal self-interference cancellation, optoelectronic oscillator and frequency downconversion for co-frequency co-time full duplex 5G communication

2019 ◽  
Author(s):  
Linbojie Huang ◽  
Yucheng Zhang ◽  
Xiaolei Li ◽  
Lei Deng ◽  
Mengfan Cheng ◽  
...  
Keyword(s):  
Interference Cancellation ◽  
Full Duplex ◽  
Optoelectronic Oscillator ◽  
5G Communication ◽  
Rf Signal

A tuneable rat-race coupler for full duplex communications

2021 ◽  
pp. 1-7
Author(s):  
G. T. Watkins
Keyword(s):  
Interference Cancellation ◽  
Phase Shifter ◽  
Dipole Antenna ◽  
Full Duplex ◽  
Frequency Channel ◽  
Ism Band ◽  
Single Antenna ◽  
Variable Attenuator ◽  
Degree Of Isolation ◽  
Better Than

Abstract Full duplex (FD) could potentially double wireless communications capacity by allowing simultaneous transmission and reception on the same frequency channel. A single antenna architecture is proposed here based on a modified rat-race coupler to couple the transmit and receive paths to the antenna while providing a degree of isolation. To allow the self-interference cancellation (SiC) to be maximized, the rat-race coupler was made tuneable. This compensated for both the limited isolation of the rat race and self-interference caused by antenna mismatch. Tuneable operation was achieved by removing the fourth port of the rat race and inserting a variable attenuator and variable phase shifter into the loop. In simulation with a 50 Ω load on the antenna port, better than −65 dB narrowband SiC was achieved over the whole 2.45 GHz industrial, scientific and medical (ISM) band. Inserting the S-parameters of a commercially available sleeve dipole antenna into the simulation, better than −57 dB narrowband SiC could be tuned over the whole band. Practically, better than −58 dB narrowband tuneable SiC was achieved with a practical antenna. When excited with a 20 MHz Wi-Fi signal, −42 dB average SiC could be achieved with the antenna.

Performance Analysis of RF Self-Interference Cancellation in Full-Duplex Wireless Communications

2014 ◽  
Vol 3 (4) ◽  
pp. 405-408 ◽  
Author(s):  
Zhaojun He ◽  
Shihai Shao ◽  
Ying Shen ◽  
Chaojin Qing ◽  
Youxi Tang
Keyword(s):  
Wireless Communications ◽  
Performance Analysis ◽  
Interference Cancellation ◽  
Full Duplex
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