liu.seSearch for publications in DiVA
Change search
ReferencesLink to record
Permanent link

Direct link
Ternära koder för variabelt felskydd
Linköping University, Department of Electrical Engineering.
2002 (Swedish)Independent thesis Basic level (professional degree)Student thesisAlternative title
Ternary Codes for Unequal Error Protection (English)
Abstract [en]

Ternary codes for unequal error protection is a part of a communication system where different parts of the information to be transmitted can receive different amount of error protection. There are a lot of applications where the channel conditions fluctuate so that reliable or acceptable communication can not be guaranteed. Regardless whether the fluctuations of the channel are intentional or not the idea is to let the coderate decrease so that the error correcting capability can increase for the part of the information to be more protected.

By using the support, the nonzero positions of the ternary code, a new binary code can be extracted with properties different from the ternary code in the sense of cardinality and minimum Hamming distance. When the channel conditions are good the receiver decodes the message using ternary decisions and receives all information included in the codeword. When the channel conditions drops the receiver decodes the message using binary decisions to assimilate the information in the support. What the properties of the ternary code should be like to give a good ternary error correcting capability and best possible error correcting capability for the support is one of the questions this thesis will look at. A number of ternary codes used in this thesis are constructed from Mattias Svanströms dissertation “Ternary Codes with Weight Constraints”, [4]. The properties of the support have been studied and modified in that sense it has given a new binary code with better error correctingcapability and an acceptable coderate.

The unequal error protection lies in the modulation scheme. By using knowledge of the weight distribution and the error correcting capability of the ternary code the signal points in the modulation scheme can be optimized in the sense of error probability for ternary or binary decoding. When optimal error probability for the complete system is required optimal signal points for both modulations schemes needs to be considered and the final signal points placed thereafter.

Place, publisher, year, edition, pages
Institutionen för systemteknik , 2002. , 51 p.
LiTH-ISY-Ex, 3521
Keyword [en]
Datorteknik, ternära koder, variabelt felskydd, likaviktskoder, konstant sammansättningskoder
Keyword [sv]
National Category
Computer Engineering
URN: urn:nbn:se:liu:diva-1501OAI: diva2:18825
Available from: 2002-12-17 Created: 2002-12-17

Open Access in DiVA

fulltext(2959 kB)355 downloads
File information
File name FULLTEXT01.pdfFile size 2959 kBChecksum SHA-1
Type fulltextMimetype application/pdf

By organisation
Department of Electrical Engineering
Computer Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 355 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 188 hits
ReferencesLink to record
Permanent link

Direct link