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Data Transmission over Speech Coded Voice Channels
Linköping University, Department of Electrical Engineering.
2006 (English)Independent thesis Basic level (professional degree), 20 points / 30 hpStudent thesisAlternative title
Datatransmission över Talkodade Kanaler (Swedish)
Abstract [en]

The voice channel in mobile communication systems have high priority and are almost always available. By using the voice channel also for data transmissions it is possible to get the same availability as for voice calls. But due to speech codecs in the voice channel, regular modems can not be used and special techniques are needed to transmit data.

This thesis presents methods to transmit data over the voice channel in a GSM, UMTS or TETRA network. The focus has been on robust data transmission rather than high data bit rates. Approaches are introduced which improve the reliability for transmissions even for systems with low rate speech codecs and channels with some distortion.

The results of the thesis are suggestions of symbol patterns and ways to create and adapt symbols for specific application and channel conditions to achieve the desired goal for the application.

Place, publisher, year, edition, pages
Institutionen för systemteknik , 2006. , 64 p.
Keyword [en]
data transmission, speech codec, voice channel, GSM, UMTS, TETRA
National Category
URN: urn:nbn:se:liu:diva-6755ISRN: LITH-ISY-EX--06/3843--SEOAI: diva2:21981
2006-06-12, Glashuset, B, Linköping, 10:15
Available from: 2006-07-14 Created: 2006-07-14

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