Equalizer with a sequence estimation method with state reduction for a receiver in a digital transmission system

US6044111A · kind A · utility

Assignee

• U.S. Philips Corporation · US

Inventors

• Raimund Meyer · Fürth, DE
• Robert Fischer · Erlangen, DE
• Wolfgang Gerstacker · Wendelstein, DE
• Johannes Huber · Brixlegg, AT
• Peter Schramm · Erlangen, DE

Key dates

• Filing date: Nov 26, 1997
• Grant date: Mar 28, 2000
• Expiry date: Nov 26, 2017

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04L25/03261
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

Abstract

The invention relates to a digital transmission system having a receiver which includes an equalizer for estimating transmitted binary symbols, from a sequence of sample values (6) of a received signal distorted by a transmission channel, by a reduced-state sequence estimation method or a reduced-state single symbol estimation method (11). To provide a receiver featuring high reliability combined with a clear state reduction of the estimation method, a minimum-phase substitute system (14) distorts the sample values received after received after a known training sequence (27) in the sequence of sample values (6)in the received order, and a maximum-phase substitute system (14) distorts the sample values (6) received before a known training sequence (27) and to be processed in reverse order for forming an estimate (11) for a received signal. The number coefficients of the impulse response which are reduced by the state reduction and used for the estimation, render the estimation inaccurate. In a minimum-phase system, the first coefficients of the impulse response of the substitute system have maximum energy with an unchanged frequency response. When these coefficients transformed in t…