Please use this identifier to cite or link to this item:
|Title:||Timing jitter tracking for orthogonal frequency division multiple access system in high doppler spread|
|Source:||Rabbi, M.F., Ko, C.C. (2012-07-24). Timing jitter tracking for orthogonal frequency division multiple access system in high doppler spread. IET Communications 6 (11) : 1438-1446. ScholarBank@NUS Repository. https://doi.org/10.1049/iet-com.2011.0633|
|Abstract:||In the use of orthogonal frequency division multiple access (OFDMA) in multiple access applications, symbols are transmitted in narrowband sub-channels, which are supposed to be orthogonal. However, the use of a practical oscillator, with its inherent drift because of temperature and other environmental changes, will result in clock jitter which destroys the orthogonality between subcarriers and introduces inter-carrier interference (ICI). To alleviate the problem, this study proposes a novel tracking-based estimation algorithm, using which the effect of clock jitter can be compensated. Instead of modelling the clock jitter as a white noise process, the authors present a more realistic coloured clock jitter model based on practical oscillators. Using the fact that the jitter is coloured and so the jitters in adjacent OFDMA symbols are very roughly related in a linear manner, the authors formulate a new algorithm that models the jitter in the most recent blocks as linearly time varying. The authors then make use of a new objective function based on this model to derive an iterative jitter tracking scheme, so that the jitter in the current block can be better tracked. Simulation results are presented to illustrate the improvement in performance that can be obtained. © 2012 The Institution of Engineering and Technology.|
|Source Title:||IET Communications|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Feb 27, 2018
WEB OF SCIENCETM
checked on Feb 19, 2018
checked on Mar 12, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.