Compensation of ADC-induced distortion in broadband full-duplex transceivers

Christian A. Schmidt, Gustavo Gonzalez, Fernando Gregorio, Juan E. Cousseau, Taneli Riihonen, Risto Wichman

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

4 Citations (Scopus)

Abstract

The performance of full-duplex transceivers is highly dependent on their ability to remove the self-interference (SI) that is generated by the simultaneous transmission and reception in the same frequency band. Even after passive isolation and RF cancellation, the magnitude of the residual SI is usually considerably higher than the signal of interest. The resolution of the analog-to-digital converter (ADC) must be rather high to accommodate both the residual SI and the intended signal to allow the digital SI cancellation. Adding to this technical challenge, 5G systems will occupy large signal bandwidths of hundreds of MHz. Thereby, high-speed and high resolution ADCs are required. In order to obtain a reasonable compromise between performance and massive production cost, a time-interleaved ADC (TI ADC) structure is often used. In this paper, we analyze the TI-ADC induced nonlinear distortion on the performance of a full-duplex transceiver. In particular, time-mismatch errors are considered, and in addition, we apply a digital post-processing to mitigate ADC imperfections. Simulation results show that even a slight mismatch in the TI ADC array can severely deteriorate the performance of the whole system. On the other hand, we show that included ADC compensation can restore adequate performance.

Original languageEnglish
Title of host publication2017 IEEE International Conference on Communications Workshops, ICC Workshops 2017
PublisherIEEE
Pages1147-1152
Number of pages6
ISBN (Electronic)9781509015252
DOIs
Publication statusPublished - 29 Jun 2017
MoE publication typeA4 Article in a conference publication
EventIEEE International Conference on Communications - Paris, France
Duration: 21 May 201725 May 2017

Publication series

NameIEEE International Conference on Communications Workshops
PublisherIEEE
ISSN (Electronic)2474-9133

Conference

ConferenceIEEE International Conference on Communications
Abbreviated titleICC
Country/TerritoryFrance
CityParis
Period21/05/201725/05/2017

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