Frequency and Timing Synchronization for In-Band Full-Duplex OFDM System

Sergey Shaboyan, Elsayed Ahmed, Alireza S. Behbahani, Waleed Younis, Ahmed M. Eltawil

Research output: Chapter in Book/Report/Conference proceedingConference contribution

11 Scopus citations

Abstract

This paper presents frequency and timing synchronization error compensation techniques for In-Band Full- Duplex (IBFD) communication systems that employ Orthogonal Frequency Division Multiplexing (OFDM). First, we describe a system model of a full-duplex base station receiving from a remote node, while transmitting to another node on the same frequency, and in same time slot. Synchronization issues between base station and remote node are analyzed. Impairments such as carrier frequency offset, sampling time offset, symbol timing offset are addressed considering both signal-of-interest and self-interferer components of the received composite signal. We then present the receive chain of the full-duplex OFDM system, and propose compensation techniques. The proposed receiver is simulated and overall performance degradation is measured to be within 0.3 to 0.7 dB of the ideal receiver, in various channel conditions. The proposed techniques are implemented and tested experimentally on a real time IBFD-OFDM system, using software defined radios. Overall performance degradation is measured to be within 0-1.5 dB as compared to a wired synchronized system, in indoor channel conditions.
Original languageEnglish (US)
Title of host publication2017 IEEE Global Communications Conference, GLOBECOM 2017 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Print)9781509050192
DOIs
StatePublished - Jul 1 2017
Externally publishedYes

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