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- Trellis_modulation abstract "In telecommunication, trellis modulation (also known as trellis coded modulation, or simply TCM) is a modulation scheme which allows highly efficient transmission of information over band-limited channels such as telephone lines. Trellis modulation was invented by Gottfried Ungerboeck working for IBM in the 1970s, and first described in a conference paper in 1976; but it went largely unnoticed until he published a new detailed exposition in 1982 which achieved sudden widespread recognition.In the late 1980s, modems operating over plain old telephone service (POTS) typically achieved 9.6 kbit/s by employing 4 bits per symbol QAM modulation at 2,400 baud (symbols/second). This bit rate ceiling existed despite the best efforts of many researchers, and some engineers predicted that without a major upgrade of the public phone infrastructure, the maximum achievable rate for a POTS modem might be 14 kbit/s for two-way communication (3,429 baud × 4 bits/symbol, using QAM).[citation needed] However, 14 kbit/s is only 40% of the theoretical maximum bit rate predicted by Shannon's Theorem for POTS lines (approximately 35 kbit/s).".
- Trellis_modulation thumbnail Convolutional_code_trellis_diagram.svg?width=300.
- Trellis_modulation wikiPageExternalLink tcm.pdf.
- Trellis_modulation wikiPageExternalLink Oral-History:Gottfried_Ungerboeck.
- Trellis_modulation wikiPageID "479030".
- Trellis_modulation wikiPageRevisionID "602040392".
- Trellis_modulation hasPhotoCollection Trellis_modulation.
- Trellis_modulation subject Category:Telecommunication_theory.
- Trellis_modulation subject Category:Telecommunications_engineering.
- Trellis_modulation comment "In telecommunication, trellis modulation (also known as trellis coded modulation, or simply TCM) is a modulation scheme which allows highly efficient transmission of information over band-limited channels such as telephone lines.".
- Trellis_modulation label "Modulación con Codificación Reticulada".
- Trellis_modulation label "Modulacja kratowo-kodowa".
- Trellis_modulation label "Trellis Coded Modulation".
- Trellis_modulation label "Trellis modulation".
- Trellis_modulation label "Trellis-Code".
- Trellis_modulation label "Треллис-модуляция".
- Trellis_modulation sameAs Mřížkově_kódovaná_modulace.
- Trellis_modulation sameAs Trellis-Code.
- Trellis_modulation sameAs Modulación_con_Codificación_Reticulada.
- Trellis_modulation sameAs Trellis_Coded_Modulation.
- Trellis_modulation sameAs Modulacja_kratowo-kodowa.
- Trellis_modulation sameAs m.02ffq6.
- Trellis_modulation sameAs Q557200.
- Trellis_modulation sameAs Q557200.
- Trellis_modulation wasDerivedFrom Trellis_modulation?oldid=602040392.
- Trellis_modulation depiction Convolutional_code_trellis_diagram.svg.
- Trellis_modulation isPrimaryTopicOf Trellis_modulation.
