Open AccessSNR Enhancement Algorithm Using Multiple Chirp Symbols with Clock Drift for Accurate Ranging
Author(s) -
Jang SeongHyun,
Kim YeongSam,
Yoon SangHun,
Chong JongWha
Publication year - 2011
Publication title -
etri journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 46
eISSN - 2233-7326
pISSN - 1225-6463
DOI - 10.4218/etrij.11.0111.0013
Subject(s) - ranging , chirp , offset (computer science) , algorithm , distortion (music) , frequency offset , computer science , electronic engineering , mathematics , physics , telecommunications , engineering , optics , bandwidth (computing) , orthogonal frequency division multiplexing , laser , amplifier , channel (broadcasting) , programming language
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.