Open AccessTail‐biting in optimal CPM detectors
Author(s) -
Lang A.,
Lankl B.
Publication year - 2020
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2019.3372
Subject(s) - detector , biting , computer science , materials science , physics , optoelectronics , optics , biology , ecology
The maximum a posteriori (MAP) detection of a continuous phase modulation (CPM) signal deploys the Bahl‐Cocke‐Jelinek‐Raviv (BCJR) algorithm that utilises the trellis structure of the CPM signal. For optimal results the start as well as the end state must be known to the MAP detector. While the start state is usually the zero state by convention, the end of the trellis must be terminated properly to yield a defined end state. This leads to an overhead, which size is dependent on the particular CPM parameters. To overcome the decrease of spectral efficiency, a tail‐biting technique is presented and compared to termination and truncation in a fair comparison regarding spectral efficiency.