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Symbol synchronization for the tdrss decoder
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Costello Jr., D. J. |
| Copyright Year | 1983 |
| Description | Each 8 bits out of the Viterbi decoder correspond to one symbol of the R/S code. Synchronization must be maintained here so that each 8-bit symbol delivered to the R/S decoder corresponds to an 8-bit symbol from the R/S encoder. Lack of synchronization, would cause an error in almost every R/S symbol since even a - 1-bit sync slip shifts every bit in each 8-bit symbol by one position, therby confusing the mapping betweeen 8-bit sequences and symbols. The error correcting capability of the R/S code would be exceeded. Possible ways to correcting this condition include: (1) designing the R/S decoder to recognize the overload and shifting the output sequence of the inner decoder to establish a different sync state; (2) using the characteristics of the inner decoder to establish symbol synchronization for the outer code, with or without a deinterleaver and an interleaver; and (3) modifying the encoder to alternate periodically between two sets of generators. |
| File Size | 399023 |
| Page Count | 9 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19840003284 |
| Archival Resource Key | ark:/13960/t8z942p9f |
| Language | English |
| Publisher Date | 1983-09-03 |
| Access Restriction | Open |
| Subject Keyword | Communications And Radar Viterbi Decoders Ultrahigh Frequencies Block Diagrams Coding Superhigh Frequencies Tdr Satellites Modems Bit Synchronization Decoders Symbolic Programming 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 |
