Upper bounds on the free distance for a class of convolutional coded CPFSK signals
Date
2001-12
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
IEEE
Abstract
In this letter, we construct new encoder-independent upper bounds on the free distance for the rate (n - 1)/n convolutional encoders that are formed by using rate 1/2 encoders and combined with 2 n-level constant-envelope full-response CPFSK signals of single-h, by generalizing the bounding technique employed for the existing bounds. The new bounds coincide with the existing bounds for h ≤ 0.25, but are generally better for h > 0.25. We also present actual encoder combinations achieving the constructed new bounds with short constraint lengths.
Description
Keywords
Coding errors, Continuous phase modulation, Encoding (symbols), Free distance, Upper bounds, Convolutional codes, Frequency shift keying, Phase modulation, Signal to noise ratio, Convolutional coding, CPFSK, Modulation, Design
Citation
Ertaş, T. (2001). "Upper bounds on the free distance for a class of convolutional coded CPFSK signals". IEEE Communications Letters, 5(12), 483-485.