Open AccessTime and frequency synchronisation scheme for orthogonal frequency division multiplexing‐based cooperative systems
Author(s) -
Guo Yi,
Liu Gang,
Ge Jianhua,
Ding Haiyang
Publication year - 2013
Publication title -
iet communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.355
H-Index - 62
eISSN - 1751-8636
pISSN - 1751-8628
DOI - 10.1049/iet-com.2013.0059
Subject(s) - orthogonal frequency division multiplexing , computer science , scheme (mathematics) , division (mathematics) , statistical time division multiplexing , frequency division multiplexing , multiplexing , synchronization (alternating current) , frequency divider , electronic engineering , telecommunications , computer network , mathematics , arithmetic , engineering , channel (broadcasting) , mathematical analysis , power dividers and directional couplers
In the cooperative relay system, different frames from different relays are not aligned in the time domain, and have different carrier frequency offsets (CFOs). Estimation of these timing offsets and CFOs is a crucial and challenging task. In this study, a new training structure is proposed, and a novel time and frequency synchronisation scheme is presented for orthogonal frequency division multiplexing‐based (OFDM‐based) cooperative systems. The coarse time synchronisation is accomplished by using the symmetric conjugate of the training symbol and the fine time synchronisation is accomplished by segment‐moving correlation. The fractional frequency offset is estimated by using the phase difference of the received signal and the integral frequency offset is estimated by utilising the good autocorrelation of the training symbol in frequency domain. The analysis and the simulation results show that, compared with the traditional scheme, the proposed scheme has better timing and frequency offset estimation performance and lower complexity for OFDM‐based cooperative systems.