Open AccessImpact of pilot pattern on carrier frequency recovery for TETRA‐like multitone modulations
Author(s) -
Marchetti L.,
Reggiannini R.
Publication year - 2014
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2014.1073
Subject(s) - frequency offset , offset (computer science) , frequency domain , computer science , range (aeronautics) , pilot signal , frequency modulation , tetra , electronic engineering , algorithm , acoustics , channel (broadcasting) , orthogonal frequency division multiplexing , engineering , bandwidth (computing) , telecommunications , physics , computer vision , programming language , aerospace engineering , paleontology , biology
A study of maximum‐likelihood pilot‐aided frequency offset recovery for filtered multitone modulations such as that employed in the TETRA Release 2 Enhanced Data Service is presented. An approach is proposed to improve on previously published algorithms. When pilot symbols are arranged on a rectangular time–frequency grid, as envisaged by the cited standard, the acquisition range of a pilot‐based frequency synchroniser may seem to be very narrow as it cannot exceed the inverse of pilot spacing in the time‐domain. It is shown that the above drawback can be relieved by resorting to a pilot pattern where the pilot symbols are simply shifted in time along the subcarriers with respect to the rectangular arrangement.