IIIE   20352
INSTITUTO DE INVESTIGACIONES EN INGENIERIA ELECTRICA "ALFREDO DESAGES"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Compensation of ADC-induced Distortion in Broadband Full-Duplex Transceivers
Autor/es:
C. SCHMIDT; J.E. COUSSEAU; F. GREGORIO; R. WICHMAN; G. GONZÁLEZ; T. RIIHONEN
Lugar:
Paris
Reunión:
Congreso; IEEE International Conference on Communications; 2017
Institución organizadora:
IEEE Communications Society
Resumen:
The performance of full-duplex transceivers ishighly dependent on their ability to remove the self-interference(SI) that is generated by the simultaneous transmission andreception in the same frequency band. Even after passive isolationand RF cancellation, the magnitude of the residual SI is usuallyconsiderably higher than the signal of interest. The resolutionof the analog-to-digital converter (ADC) must be rather highto accommodate both the residual SI and the intended signalto allow the digital SI cancellation. Adding to this technicalchallenge, 5G systems will occupy large signal bandwidths ofhundreds of MHz. Thereby, high-speed and high resolutionADCs are required. In order to obtain a reasonable compromisebetween performance and massive production cost, a timeinterleavedADC (TI ADC) structure is often used. In this paper,we analyze the TI-ADC induced nonlinear distortion on theperformance of a full-duplex transceiver. In particular, timemismatcherrors are considered, and in addition, we apply adigital post-processing to mitigate ADC imperfections. Simulationresults show that even a slight mismatch in the TI ADC arraycan severely deteriorate the performance of the whole system.On the other hand, we show that included ADC compensationcan restore adequate performance.