Coarse carrier and timing synchronization for interleaved OFDMA uplink system

• Published in: 2010 IEEE International Symposium on Broadband Multimedia Systems and Broadcasting (BMSB) pp. 1 - 5
• Main Authors: Ruiqin Miao, Jun Sun, Lin Gui, Jian Xiong
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.03.2010
• Subjects: Autocorrelation; Carrier frequency offset (CFO) estimation; Delay effects; Delay estimation; Extraterrestrial measurements; Frequency conversion; Frequency estimation; Frequency synchronization; interleaved orthogonal frequency division multiple access (OFDMA); Multipath channels; time delay estimation; Time domain analysis; Timing
• ISBN: 1424444616; 9781424444618
• ISSN: 2155-5044; 2155-5052
• DOI: 10.1109/ISBMSB.2010.5463114

In orthogonal frequency division multiple access (OFDMA) uplink system, estimations of time delay and carrier frequency offset (CFO) are both particularly challenging. In this paper, a coarse CFO and time delay estimation method is proposed for interleaved OFDMA uplink system. By exploiting the special scheme of interleaved OFDMA, the repetitive time-domain training symbol is designed, and the training sequences for different users have good autocorrelation and cross-correlation properties. Furthermore, the time delay and CFO estimation metrics are presented by making certain correlation between the received training symbol and the local sequence. Through searching peak of the proposed metrics, integral CFO of many subcarriers spaces for each user can be estimated, and then timing delay for each user can be found. Simulations illustrate the proposed estimation scheme can get good performance under multipath channel.