Citation
Abstract
In the current NASA Planetary Program Flight/Ground Data System Standard, it is proposed that alternate symbols of the output of a convolutional encoder be inverted in order to guarantee the symbol synchronizer a certain richness of symbol transition. In this paper we analyze this technique; in particular we characterize those convolutional codes with the property that even if alternate symbols are inverted, arbitrarily long transition free symbol streams may occur. For codes which do not exhibit this pathological behavior, we give an upper bound on the largest possible transition-free run.
Details
- Volume
- 42-44
- Published
- April 15, 1978
- Pages
- 90–97
- File Size
- 854.7 KB