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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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SNR Enhancement Algorithm Using Multiple Chirp Symbols with Clock Drift for Accurate Ranging

  • Jang, Seong-Hyun (Department of Electronics and Computer Engineering, Hanyang University) ;
  • Kim, Yeong-Sam (Department of Electronics and Computer Engineering, Hanyang University) ;
  • Yoon, Sang-Hun (Convergence Components & Materials Research Laboratory, ETRI) ;
  • Chong, Jong-Wha (Department of Electronics and Computer Engineering, Hanyang University)
  • Received : 2010.12.31
  • Accepted : 2011.05.31
  • Published : 2011.12.31
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Abstract

A signal-to-noise ratio (SNR) enhancement algorithm using multiple chirp symbols with clock drift is proposed for accurate ranging. Improvement of the ranging performance can be achieved by using the multiple chirp symbols according to Cramer-Rao lower bound; however, distortion caused by clock drift is inevitable practically. The distortion induced by the clock drift is approximated as a linear phase term, caused by carrier frequency offset, sampling time offset, and symbol time offset. SNR of the averaged chirp symbol obtained from the proposed algorithm based on the phase derotation and the symbol averaging is enhanced. Hence, the ranging performance is improved. The mathematical analysis of the SNR enhancement agrees with the simulations.

Keywords

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