Robust timing synchronization for full duplex communications: Design and implementation

Min Keun Chung, Liang Liu, Ove Edfors, Dong Ku Kim, Chan Byoung Chae

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

2 Citations (Scopus)

Abstract

This paper presents a robust timing synchronization method for full duplex orthogonal frequency division multiplexing (OFDM) systems based on Long Term Evolution (LTE). The proposed method contains two essential steps: 1) time alignment between the desired signal and self-interference 2) normalized synchronization peak (NSP) index switching. The time alignment is to make the difference in arrival times of the desired signal and the self-interference signal within cyclic prefix (CP) duration of an OFDM symbol, exploiting a time advance, thereby adopting low-complexity, frequency domain self-interference cancellation and decoding. In the second step, to improve the probability of successful time synchronization, a Zadoff-Chu sequence with a different root index is used for the primary synchronization signal at each node. To validate the proposed method with experimental evidence, we implement a full duplex physical layer (PHY) on an FPGA-based software-defined radio (SDR) platform. It is shown that our full duplex OFDM synchronizer is flexible and robust, in a real-world wireless channel, compared to existing synchronization method.

Original languageEnglish
Title of host publication2017 IEEE Global Conference on Signal and Information Processing, GlobalSIP 2017 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages883-887
Number of pages5
ISBN (Electronic)9781509059904
DOIs
Publication statusPublished - 2018 Mar 7
Event5th IEEE Global Conference on Signal and Information Processing, GlobalSIP 2017 - Montreal, Canada
Duration: 2017 Nov 142017 Nov 16

Publication series

Name2017 IEEE Global Conference on Signal and Information Processing, GlobalSIP 2017 - Proceedings
Volume2018-January

Other

Other5th IEEE Global Conference on Signal and Information Processing, GlobalSIP 2017
CountryCanada
CityMontreal
Period17/11/1417/11/16

Bibliographical note

Funding Information:
V. CONCLUSIONS We presented a new timing synchronization method for full-duplex communication systems, using the desired and self-interference signals of each user. As proof-of-concept, by implementing the proposed method on our full-duplex SISO/MIMO link prototype, we experimentally verified that the NSP index switching achieved high probability of timing synchronization success. We believe our initial test results provide worthwhile insights for the development of a more viable full-duplex radio. ACKNOWLEDGMENT This work was supported by Institute for Information & Communications Technology Promotion(IITP) grant funded by the Korea government(MSIT) (2015-0-00300, Multiple Access Technique with Ultra-Low Latency and High Efficiency for Tactile Internet Services in IoT Environments).

Publisher Copyright:
© 2017 IEEE.

All Science Journal Classification (ASJC) codes

  • Information Systems
  • Signal Processing

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