PROJECT TITLE :

Digital Self-Interference Cancellation With Variable Fractional Delay FIR Filter for Full-Duplex Radios - 2018

ABSTRACT:

In full-duplex radios, delay alignment errors end in random mismatch between the self-interference (SI) signal and therefore the reconstructed cancellation signal, leading to the performance degradation of the SI cancellation. During this letter, a variable fractional delay (VFD) FIR filter with additional precise delay alignment is exploited to suppress the SI in digital domain. The closed-form expressions of the VFD FIR filter coefficients are reformulated by minimizing the residual SI power. Based on the obtained SI cancellation capability, the influence of the filter order on the SI cancellation is then characterized. Simulations show that the deployment of the VFD FIR filter significantly enhances the SI cancellation performance. Specifically, when the SI signal bandwidths are zero.5 and ten MHz, the cancellation capability of employing the VFD FIR filter based mostly on the proposed coefficients outperforms the VFD FIR filter underneath the LS criterion by half dozen.five and 3.seven dB, respectively, which presents a potential contribution to boost the SI cancellation performance.


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