Telia Ab

Thomas Stefansson

Mikael Isaksson

Daniel Bengtsson

Lennart Olsson

Gunnar Bahlenberg

Magnus Johansson

Anders Isaksson

Goran Okvist

Tomas Nordstrom

Hans Ohman

Lis-Marie Ljunggren

Lars-Ake Isaksson

Siwert Hakansson

Harry Tonvall

Ye Wen

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.

Multi-carrier transmission systems

Growing community of inventors

Lulea, Sweden

Thomas Stefansson