Measurements on Convolution Codes

All trials use unquantised soft-decision Viterbi decoding. List decoding uses the tree-trellis algorithm. Blocks are terminated by encoder flushing.

Message Error Rates

Measured failure rates for some combinations of code rate and constraint length. All examples use 72 bits of information per message plus a 16 bit CRC.

Each chart also shows the sphere packing limit (SPL) calculated for messages with the same block size. See Appendix for details of the calculation.