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Error control techniques for satellite and space communications (Document No: 19860018045)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Costello Jr., D. J. |
| Copyright Year | 1986 |
| Description | High rate concatenated coding systems with trellis inner codes and Reed-Solomon (RS) outer codes for application in satellite communication systems are considered. Two types of inner codes are studied: high rate punctured binary convolutional codes which result in overall effective information rates between 1/2 and 1 bit per channel use; and bandwidth efficient signal space trellis codes which can achieve overall effective information rates greater than 1 bit per channel use. Channel capacity calculations with and without side information performed for the concatenated coding system. Concatenated coding schemes are investigated. In Scheme 1, the inner code is decoded with the Viterbi algorithm and the outer RS code performs error-correction only (decoding without side information). In scheme 2, the inner code is decoded with a modified Viterbi algorithm which produces reliability information along with the decoded output. In this algorithm, path metrics are used to estimate the entire information sequence, while branch metrics are used to provide the reliability information on the decoded sequence. This information is used to erase unreliable bits in the decoded output. An errors-and-erasures RS decoder is then used for the outer code. These two schemes are proposed for use on NASA satellite channels. Results indicate that high system reliability can be achieved with little or no bandwidth expansion. |
| File Size | 1790877 |
| Page Count | 76 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19860018045 |
| Archival Resource Key | ark:/13960/t94798p13 |
| Language | English |
| Publisher Date | 1986-07-01 |
| Access Restriction | Open |
| Subject Keyword | Communications And Radar Viterbi Decoders Algorithms Signal To Noise Ratios Bit Error Rate Bandwidth Communication Satellites Channels Data Transmission Concatenated Codes Communication Networks Error Correcting Codes Satellite Communication Decoders 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 |
