Citation
Abstract
This article investigates the gain in signal-to-noise ratio that may be realized by using redundancies inherent in TV data to modify the decoding metric of the DSN Viterbi decoders. This modification would take into account the memory in a TV scan line to change the transition probabilities as originally computed using independent data. The resulting data rate gain or error probability decrease is achieved without requiring any spacecraft modifications or additions. A preliminary examination of this concept on a binary symmetric channel rather than a Gaussian channel and using a simplified Markov source model involving two-level or hard-clipped TV shows that very substantial decreases in error probability may be achieved.
Details
- Volume
- 42-55
- Published
- February 15, 1980
- Pages
- 97–110
- File Size
- 1.3 MB