Title :
OFDM time and frequency synchronization by spread spectrum pilot technique
Author :
Tufvesson, Fredrik ; Faulkne, Mike ; Hoeher, Peter ; Edfors, Ove
Author_Institution :
Dept. of Appl. Electron., Lund Univ., Sweden
Abstract :
Correct time and frequency synchronization is important for the performance of orthogonal frequency division multiplex (OFDM) systems. We evaluate a system where a pseudonoise sequence (PN-sequence) is used for estimation of these synchronization parameters. The PN-sequence is superimposed on the OFDM signal. The system is evaluated by means of the variance of the frequency estimation error and the probability for correct timing synchronization. Both theoretical and simulated results are presented. The proposed technique is very flexible and works also at low signal to noise ratios. The frequency offset range has been significantly increased compared to conventional OFDM synchronizer schemes
Keywords :
OFDM modulation; error analysis; frequency estimation; probability; pseudonoise codes; sequences; spread spectrum communication; synchronisation; timing; OFDM signal; PN-sequence; SNR; code sequence; correct timing synchronization probability; frequency estimation error; frequency offset range; frequency synchronization; low signal to noise ratio; orthogonal frequency division multiplex; pseudonoise sequence; simulated results; spread spectrum pilot technique; synchronization parameters estimation; system performance; time synchronization; variance; Bandwidth; Demodulation; Frequency division multiplexing; Frequency estimation; Frequency synchronization; Informatics; OFDM; Signal to noise ratio; Spread spectrum communication; Timing;
Conference_Titel :
Communication Theory Mini-Conference, 1999
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-5653-5
DOI :
10.1109/CTMC.1999.790248
