Title :
An all-digital frequency synchronization scheme for OFDM systems
Author :
Zhenhong, Li ; Mämmelä, Aarne
Author_Institution :
VTT Electron., Oulu, Finland
Abstract :
The main purpose of this paper is to study the frequency synchronization problem in OFDM systems. A new frequency synchronization method is achieved by means of an all-digital synchronization loop including acquisition and tracking modes. The frequency offset is estimated only once per frame. The acquisition algorithm is based on periodically inserted reference symbols, and the tracking algorithm on the cyclic prefix of the OFDM symbols. The algorithm performance is assessed in an AWGN channel with a low SNR value and in the presence of a timing inaccuracy. The simulations show that the algorithm is accurate and the suggested frequency synchronization scheme works well
Keywords :
Gaussian channels; digital communication; frequency division multiplexing; frequency estimation; synchronisation; tracking; AWGN channel; OFDM systems; acquisition; algorithm performance; all-digital frequency synchronization scheme; cyclic prefix; frequency offset; periodically inserted reference symbols; timing inaccuracy; tracking; AWGN channels; Data communication; Degradation; Frequency estimation; Frequency synchronization; OFDM; Phase estimation; Research and development; Timing; Tracking loops;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 1997. Waves of the Year 2000. PIMRC '97., The 8th IEEE International Symposium on
Conference_Location :
Helsinki
Print_ISBN :
0-7803-3871-5
DOI :
10.1109/PIMRC.1997.630922
