Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
Multi-carrier transmission systems
 A multi-carrier transmission system using DMT. It is known to recover a receiver sample and clock from a reserved carrier, a pilot carrier having a fixed phase. A sampling clock oscillator in a receiver is then phase locked to the pilot carrier. Multi-carrier receivers, such as DMT receivers, are normally equipped with an FFT processor. A complex number representing the pilot carrier is then available from the FFT processor output. If an FFT processor is not available, a one frequency DFT processor can be provided to produce a complex estimate of the pilot carrier. In a DMT system, frame synchronization is handled separately from sampling clock synchronization, although the two processes are intimately related and frame synchronization must be acquired before sampling clock synchronization. 
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Goran Gunnar Siwert Thomas Lennart Mikael Tomas Daniel Hans Harry Anders Magnus Lis-Marie Lars-Ake Ye
Okvist Bahlenberg Hakansson Stefansson Olsson Isaksson Nordstrom Bengtsson Ohman Tonvall Isaksson Johansson Ljunggren Isaksson Wen