Hybrid and concatenated coding applications.Results of a study to evaluate the performance and implementation complexity of a concatenated and a hybrid coding system for moderate-speed deep-space applications. It is shown that with a total complexity of less than three times that of the basic Viterbi decoder, concatenated coding improves a constraint length 8 rate 1/3 Viterbi decoding system by 1.1 and 2.6 dB at bit error probabilities of 0.0001 and one hundred millionth, respectively. With a somewhat greater total complexity, the hybrid coding system is shown to obtain a 0.9-dB computational performance improvement over the basic rate 1/3 sequential decoding system. Although substantial, these complexities are much less than those required to achieve the same performances with more complex Viterbi or sequential decoder systems.
Document ID
19730038599
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Hofman, L. B. (NASA Ames Research Center Moffett Field, Calif., United States)
Odenwalder, J. P. (LINKABIT Corp. San Diego, Calif., United States)