A Synchronization Technique for OFDM-Based Full Duplex Relays with Frequency-Domain Feedback Interference Canceller

Hyun-Il YOO
Kyung-Soo WOO
Chang-Hwan PARK
Jaekwon KIM
Sungyoon JUNG
Yong-Soo CHO

IEICE TRANSACTIONS on Communications   Vol.E92-B    No.11    pp.3487-3490
Publication Date: 2009/11/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.3487
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Transmission Systems and Transmission Equipment for Communications
full-duplex relays,  interference cancellation,  OFDM,  synchronization,  

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In a Decode and Forward (DF) type of an OFDM-based Full Duplex Relay (FDR), the frequency-domain approach is more efficient than the time-domain approach for feedback interference cancellation. However, Inter-Symbol Interference (ISI) and Inter-Carrier Interference (ICI) may occur due to timing mismatch between the feedback interference signal and the desired signal from the Base Station (BS). In this letter, the effects of a timing mismatch on synchronous types and asynchronous types of OFDM-based FDRs are investigated in uplink and downlink cases. A synchronization procedure and techniques for minimizing ISI and ICI in OFDM-based FDRs with a frequency-domain feedback interference canceller are proposed.