Multi-carrier transmission systems

US6456649B1 · kind B1 · utility

Assignee

• STMICROELECTRONICS N.V. · NL

Inventors

• Mikael Isaksson · Luleå, SE
• Magnus Johansson · Luleå, SE
• Harry Tonvall · Luleå, SE
• Lennart Olsson · Luleå, SE
• Tomas Stefansson · Luleå, SE
• Hans Ohman · Luleå, SE
• Gunnar Bahlenberg · Luleå, SE
• Anders Isaksson · Luleå, SE
• Goran Okvist · Luleå, SE
• Lis-Marie Ljunggren · Luleå, SE
• Tomas Nordstrom · Luleå, SE
• Lars-Ake Isaksson · Luleå, SE
• Daniel Bengtsson · Luleå, SE
• Siwert Hakansson · Luleå, SE
• Ye Wen · Luleå, SE
• Per Ödling · Ayacucho, PE

Key dates

• Filing date: Aug 30, 1999
• Grant date: Sep 24, 2002
• Expiry date: Aug 30, 2019

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04L1/0071
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

Abstract

A multi-carrier transmission system such as a DMT system. Channel information is transmitted between two transceivers using a plurality of sub-carriers modulated with symbols, each of which represents a multiplicity of bits. Each of the transceivers includes a receiver and a transmitter in which a fixed maximum value was determined for the number of bits for each symbol and in which the system is adapted to determine the bit capacity per symbol of each of the plurality of sub-carriers and to increase the number of bits represented by a symbol transmitted over those sub-carriers having a capacity less than a fixed maximum value to the maximum value by the addition of channel coding bits. The fixed maximum value for the number of bits for each symbol may be determined on the basis of the bit capacity of that one of the sub-carriers having the highest theoretical bit capacity may be at least as large as the theoretical bit capacity.