Allen, Dyer, Doppelt, Milbrath & Gilchrist, P.A.
Multi-carrier transmission systems
A multi-carrier transmission system using orthogonal carriers with high order QAM constellations for the transmission of multiple bits per carrier and symbol. Such systems place high demands on the synchronization of the receiver with the transmitter. The maximum permitted deviation from exact synchronization is usually a small fraction of a sampling interval. A reserve carrier, the pilot carrier, which is given a fixed phase, is usually used as the reference to achieve this high accuracy. The receiver sampling clock oscillator is phase locked to the pilot carrier. It is therefore necessary to estimate the phase of the pilot carrier. Using a bandpass filter to recover the pilot carrier, regardless of the frame structure of the DMT signal, does not eliminate the influence of neighboring carriers on the pilot carrier.
STMicroelectronics N.V.
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additional inventional inventional
Harry Gunnar Lennart Tomas Lis-Marie Anders Lars-Ake Magnus Ye Tomas Mikael Daniel Siwert Goran Hans
Tonvall Bahlenberg Olsson Nordstrom Ljunggren Isaksson Isaksson Johansson Wen Stefansson Isaksson Bengtsson Hakansson Okvist Ohman