VHF and HF Field Tests with an Interleaved 1/3 Rate Block Code

Abstract

A one-way error correcting system that employs a onethird rate, interleaved, block code was constructed and tested at teleprinter speeds. All system functions including timing and synchronization were tested over a 1300 km VHF ionoscatter path and a 1500 km HF path. The decoder used "minimum-distance decoding." The results showed that coder performance was close to theoretical predictions. A useful secondary output, called the inversion count, was analyzed. A difference in coder performance was noted between the VHF and HF channels.