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- Q557200 subject Q6462928.
- Q557200 subject Q7210420.
- Q557200 abstract "In telecommunication, trellis modulation (also known as trellis coded modulation, or simply TCM) is a modulation scheme that transmits information with high efficiency over band-limited channels such as telephone lines. Gottfried Ungerboeck invented trellis modulation while working for IBM in the 1970s, and first described it in a conference paper in 1976. It went largely unnoticed, however, until he published a new, detailed exposition in 1982 that achieved sudden and widespread recognition.In the late 1980s, modems operating over plain old telephone service (POTS) typically achieved 9.6 kbit/s by employing four 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).14 kbit/s is only 40% of the theoretical maximum bit rate predicted by Shannon's theorem for POTS lines (approximately 35 kbit/s). Ungerboeck's theories demonstrated that there was considerable untapped potential in the system, and by applying the concept to new mode standards, speed rapidly increased to 14.4, 28.8 and ultimately 33.6 kbit/s.".
- Q557200 thumbnail Convolutional_code_trellis_diagram.svg?width=300.
- Q557200 wikiPageExternalLink tcm.pdf.
- Q557200 wikiPageExternalLink Oral-History:Gottfried_Ungerboeck.
- Q557200 wikiPageWikiLink Q1373572.
- Q557200 wikiPageWikiLink Q1395022.
- Q557200 wikiPageWikiLink Q1462168.
- Q557200 wikiPageWikiLink Q2345282.
- Q557200 wikiPageWikiLink Q277151.
- Q557200 wikiPageWikiLink Q376150.
- Q557200 wikiPageWikiLink Q418.
- Q557200 wikiPageWikiLink Q5607.
- Q557200 wikiPageWikiLink Q6462928.
- Q557200 wikiPageWikiLink Q7210420.
- Q557200 wikiPageWikiLink Q7351621.
- Q557200 wikiPageWikiLink Q749753.
- Q557200 wikiPageWikiLink Q90302.
- Q557200 wikiPageWikiLink Q956129.
- Q557200 comment "In telecommunication, trellis modulation (also known as trellis coded modulation, or simply TCM) is a modulation scheme that transmits information with high efficiency over band-limited channels such as telephone lines. Gottfried Ungerboeck invented trellis modulation while working for IBM in the 1970s, and first described it in a conference paper in 1976.".
- Q557200 label "Trellis modulation".
- Q557200 depiction Convolutional_code_trellis_diagram.svg.