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Performance of convolutional codes on fading channels typical of planetary entry missions
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Reale, T. J. Mui, S. Y. Modestino, J. W. |
| Copyright Year | 1974 |
| Description | The performance of convolutional codes in fading channels typical of the planetary entry channel is examined in detail. The signal fading is due primarily to turbulent atmospheric scattering of the RF signal transmitted from an entry probe through a planetary atmosphere. Short constraint length convolutional codes are considered in conjunction with binary phase-shift keyed modulation and Viterbi maximum likelihood decoding, and for longer constraint length codes sequential decoding utilizing both the Fano and Zigangirov-Jelinek (ZJ) algorithms are considered. Careful consideration is given to the modeling of the channel in terms of a few meaningful parameters which can be correlated closely with theoretical propagation studies. For short constraint length codes the bit error probability performance was investigated as a function of E sub b/N sub o parameterized by the fading channel parameters. For longer constraint length codes the effect was examined of the fading channel parameters on the computational requirements of both the Fano and ZJ algorithms. The effects of simple block interleaving in combatting the memory of the channel is explored, using the analytic approach or digital computer simulation. |
| File Size | 2819534 |
| Page Count | 83 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19750012989 |
| Archival Resource Key | ark:/13960/t48q0sm5m |
| Language | English |
| Publisher Date | 1974-05-31 |
| Access Restriction | Open |
| Subject Keyword | Cybernetics Codes Error Analysis Performance Prediction Convolution Integrals Computerized Simulation Decoding Atmospheric Entry Phase Shift Keying Viterbi Decoders Constraints Channels Data Transmission Pioneer Venus Spacecraft Radio Communication Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
