Robust digital non-linear self-interference cancellation in full duplex radios with maximum correntropy criterion

2016 ◽  
Vol 13 (9) ◽  
pp. 53-59 ◽  
Author(s):  
Zhirong Luan ◽  
Hua Qu ◽  
Jihong Zhao ◽  
Badong Chen
Keyword(s):  
Interference Cancellation ◽  
Full Duplex ◽  
Non Linear ◽  
Maximum Correntropy Criterion

scholarly journals On Self-Interference Cancellation and Non-Idealities Suppression in Full-Duplex Radio Transceivers

Mathematics ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 1434
Author(s):  
Areeba Ayesha ◽  
MuhibUr Rahman ◽  
Amir Haider ◽  
Shabbir Majeed Chaudhry
Keyword(s):  
Interference Cancellation ◽  
Full Duplex ◽  
Budget Analysis ◽  
Rf Impairments ◽  
Non Linear ◽  
Link Budget ◽  
Transmitted Signal ◽  
Radio Transceiver ◽  
With Memory ◽  
Analog Domain

One of the major impediments in the design and operation of a full-duplex radio transceiver is the presence of self-interference (SI), that is, the transceiver’s transmitted signal, 60–100 dB stronger than the desired signal of interest. To reduce the SI signal below the receiver’s sensitivity before coupling it to the receiver, radio frequency (RF)/analog domain cancellation is carried out. Even after SI cancellation to the required level in the analog domain, the residual SI signal still exits and lowers the transceiver’s performance. For residual SI cancellation, a digital domain cancellation is carried out. RF impairments are the major obstacle in the residual SI cancellation path in the digital domain. Linearization of RF impairments such as IQ mixer imbalance in the transmitter and receiver chain, non-linear PA with memory, and non-linear LNA are also carried out. Performance evaluation of the proposed techniques is carried out based on SINR, the power of different SI signal components, PSD, output to input relationship, SNR vs. BER, spectrum analyzer, constellation diagram, and link budget analysis. The proposed techniques provide attractive RF/analog SI cancellation of up to 80–90 dB, digital residual SI cancellation of up to 35 to 40 dB, total SI cancellation of up to 110 to 130 dB, and an SINR improvement of up to 50 dB.

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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