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http://dx.doi.org/10.4218/etrij.11.0111.0013

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)
Publication Information
ETRI Journal / v.33, no.6, 2011 , pp. 841-848 More about this Journal
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
Multiple chirp symbols; SNR enhancement; clock drift; ranging; linear phase;
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