USRP Experimental Approach for Digital Self-Interference Cancellation in Full-Duplex Communications

Despina-Stoian, Cristina; Youssef, Roua; Digulescu, Angela; Rădoi, Emanuel; Popescu, Florin; Șerbănescu, Alexandru; Gautier, Roland

doi:10.1109/atc52653.2021.9598203

Cited by 1 publication

(2 citation statements)

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“…Thus, it is much more convenient to develop experimental testbeds for the validation and evaluation of the proposed SIC approaches. USRP-based platforms [7] embedding SDR technology represent promising tools for testing and evaluating the performance of state-of-the-art solutions in the radio communications domain.…”

Section: Usrp-based Experimental Setupmentioning

confidence: 99%

“…Based on the known transmitted signal, most digital SIC solutions [7][8][9][10][11] aim to eliminate the residual SI remaining after the first two cancellation stages, whose performance is limited by the analog components' complexity and impairments. Therefore, a realistic SI model, taking into account all the important nonlinearities, is needed to improve the SIC capability of FD transceivers.…”

Section: Introductionmentioning

confidence: 99%

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Widely-Linear Digital Self-Interference Cancellation in Full-Duplex USRP Transceiver

Despina-Stoian

Youssef

Digulescu

et al. 2022

Sensors

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Full-duplex (FD) communication systems allow for increased spectral efficiency but require effective self-interference cancellation (SIC) techniques to enable the proper reception of the signal of interest. The underlying idea of digital SIC is to estimate the self-interference (SI) channel based on the received signal and the known transmitted waveform. This is a challenging task since the SI channel involves, especially for mass-market FD transceivers, many nonlinear distortions produced by the impairments of the analog components from the receiving and transmitting chains. Hence, this paper first analyzes the power of the SI components under practical conditions and focuses on the most significant one, which is proven to be produced by the I/Q mixer imbalance. Then, a widely-linear digital SIC approach is adopted, which simultaneously deals with the direct SI and its image component caused by the I/Q imbalance. Finally, the performances achieved by linear and widely-linear SIC approaches are evaluated and compared using an experimental FD platform relying on software-defined radio technology and GNU Radio. Moreover, the considered experimental framework allows us to set different image rejection ratios for the transmission path I/Q mixer and to study its influence on the SIC capability of the discussed approaches.

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Section: Usrp-based Experimental Setupmentioning

confidence: 99%