A new CAZAC-based preamble for OFDM systems

Gang Liu, Lihua Wang, Yi Guo, I. Tai Lu, Jianhua Ge

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Digital Video Broadcasting - Second Generation Terrestrial (DVB-T2) is a new standard used for the digital terrestrial television broadcast. Compared with the first generation DVB-T, it introduced various advanced technologies to improve system capacity and transmission reliability. One of the new designs in DVB-T2 is to use P1 symbol as the preamble to help the receiver to achieve fast synchronization. Although lots of research work has been done to improve the synchronization performance by P1 symbol, many disadvantages (such as high complexity to generate P1, little information carried by P1 symbol, weakness in carrier frequency offset estimation under multipath channels, etc.) remain. Based on constant amplitude zero auto correlation (CAZAC) sequence, a new preamble denoted as C1 is therefore proposed in this paper for the synchronization of orthogonal frequency division multiplexing (OFDM) systems. In the proposed scheme, the coarse timing synchronization and fractional frequency offset (FFO)estimation are done simultaneously in the time domain, while the integral frequency offset (IFO) estimation and the transmission parameter signaling (TPS) decoding are done in the frequency domain. Analysis and simulation results show that, compared with P1, the proposed preamble C1 not only has a lower implementation complexity and a lower peak to average power ratio (PAPR), but also can carry more system information for the receiving demodulator. The synchronization scheme with C1 performs better than that with P1 in timing and frequency offsets estimations under multipath channels. Therefore we conclude that the proposed preamble is more suitable for wideband OFDM systems under multipath environments.

Original languageEnglish (US)
Title of host publication2014 IEEE Long Island Systems, Applications and Technology Conference, LISAT 2014
PublisherIEEE Computer Society
ISBN (Print)9781479938506
DOIs
StatePublished - Jan 1 2014
Event2014 IEEE Long Island Systems, Applications and Technology Conference, LISAT 2014 - Farmingdale, NY, United States
Duration: May 2 2014May 2 2014

Publication series

Name2014 IEEE Long Island Systems, Applications and Technology Conference, LISAT 2014

Other

Other2014 IEEE Long Island Systems, Applications and Technology Conference, LISAT 2014
CountryUnited States
CityFarmingdale, NY
Period5/2/145/2/14

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Keywords

  • DVB-T2
  • OFDM
  • preamble
  • synchronization

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Computer Science Applications

Cite this

Liu, G., Wang, L., Guo, Y., Lu, I. T., & Ge, J. (2014). A new CAZAC-based preamble for OFDM systems. In 2014 IEEE Long Island Systems, Applications and Technology Conference, LISAT 2014 [06845206] (2014 IEEE Long Island Systems, Applications and Technology Conference, LISAT 2014). IEEE Computer Society. https://doi.org/10.1109/LISAT.2014.6845206