Title :
Synchronization schemes for packet OFDM system
Author :
Tang, Haiyun ; Lau, Kam Y. ; Brodersen, Robert W.
Author_Institution :
Berkeley Wireless Res. Center, CA, USA
Abstract :
A complete OFDM synchronization chain is proposed based on practical synchronization schemes. The synchronization is accomplished in three steps: frame detection (or timing), frequency offset estimation, and phase tracking. For frame detection, time-domain differential PN sequence is used. For frequency offset estimation, time-domain correlation of adjacent pilot symbols estimates the fractional part of the frequency offset and frequency-domain differential PN sequence is used to find the integer part. The phase offset due to frequency offset estimation error as well as the phase noise is tracked using a digital phase lock loop.
Keywords :
OFDM modulation; digital phase locked loops; frequency estimation; packet radio networks; phase noise; pseudonoise codes; synchronisation; OFDM synchronization chain; differential PN sequence; digital phase lock loop; frame detection; frequency offset estimation; phase noise; phase tracking; pilot symbols estimates; synchronization schemes; time-domain correlation; Estimation error; Frequency estimation; Frequency synchronization; OFDM; Phase detection; Phase estimation; Phase frequency detector; Phase noise; Time domain analysis; Timing;
Conference_Titel :
Communications, 2003. ICC '03. IEEE International Conference on
Print_ISBN :
0-7803-7802-4
DOI :
10.1109/ICC.2003.1204075
