Digital-Assisted Photonic Analog Wideband Multipath Self-Interference Cancellation

A digital-assisted photonic analog wideband radio-frequency multipath self-interference cancellation (SIC) and frequency downconversion method based on a dual-drive Mach-Zehnder modulator and the recursive least square (RLS) algorithm is proposed and demonstrated for in-band full-duplex systems. Bes...

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Bibliographic Details
Published in:IEEE photonics technology letters 2022-03, Vol.34 (5), p.299-302
Main Authors: Han, Moxuan, Shi, Taixia, Chen, Yang
Format: Article
Language:English
Subjects:
Adaptive filters
Algorithms
Broadband
Cancellation
Carrier frequencies
Digital to analog converters
in-band full-duplex
Interference
Interference cancellation
Mach-Zehnder interferometers
Microwave filters
microwave photonics
Multipath self-interference cancellation
Optical filters
Photonics
Receiving antennas
RLS algorithm
Signal reflection
Transmitting antennas
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Summary:A digital-assisted photonic analog wideband radio-frequency multipath self-interference cancellation (SIC) and frequency downconversion method based on a dual-drive Mach-Zehnder modulator and the recursive least square (RLS) algorithm is proposed and demonstrated for in-band full-duplex systems. Besides the reference for the direct-path self-interference (SI) signal, the RLS algorithm is used to construct another reference for the residual SI signal from the direct path and the SI signals from the reflection paths. The proposed method can solve the performance limitation in the previously reported SIC methods of constructing the multipath SI signal using a single reference which is caused by the limited dynamic range of the digital-to-analog converter when the direct-path SI signal is much stronger than the sub-weak reflection-path SI signals. An experiment is performed. When the carrier frequency of the multipath SI signal is 10 GHz and the direct-path SI signal is much stronger than the sub-weak multipath SI signal, cancellation depths of about 26.7 and 26.1 dB are realized with SI baud rates of 0.5 and 1 Gbaud. When the direct-path SI signal and sub-weak multipath SI signal own closer power, the corresponding cancellation depths are 24.7 and 20.8 dB, respectively.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2022.3153336