trellis modulation造句

• Finally, in 1982, Ungerboeck published a paper describing the principles of trellis modulation.
• Gottfried Ungerboeck invented trellis modulation while working for IBM in the 1970s, and first described it in a conference paper in 1976.
• Without the discovery and eventual application of trellis modulation, maximum telephone rates using voice-bandwidth channels would have been limited to 3, 429 baud ?4 bit / symbol = approximately 14 kbit / s using traditional QAM.
• Once manufacturers introduced modems with trellis modulation, transmission rates increased to the point where interactive transfer of multimedia over the telephone became feasible ( a 200 kilobyte image and a 5 megabyte song could be downloaded in less than 1 minute and 30 minutes, respectively ).
• Pradhan and Ramchandran designed rules for construction of sub-codes for each source, and presented result of trellis-based coset constructions in DSC, which is based on convolution code and set-partitioning rules as in Trellis modulation, as well as lattice code based DSC.
• 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.
• Other key inventions include trellis modulation, which revolutionized data transmission over telephone lines; Token Ring, which became a standard for local area networks and a highly successful IBM product; the Secure Electronic Transaction ( SET ) standard used for highly secure payments; and the Java Card OpenPlatform ( JCOP ), a smart card operating system.