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1. (WO2001026317) METHOD FOR DETERMINING THE AMPLITUDE IMBALANCE AT THE RECEIVING END AND QUADRATURE ERROR IN A MULTI-CARRIER SYSTEM

Pub. No.:    WO/2001/026317    International Application No.:    PCT/EP2000/008623
Publication Date: Apr 12, 2001 International Filing Date: Sep 4, 2000
IPC: H04L 27/26
H04L 27/38
Applicants: ROHDE & SCHWARZ GMBH & CO. KG
BALZ, Christoph
HOFMEISTER, Martin
Inventors: BALZ, Christoph
HOFMEISTER, Martin
Title: METHOD FOR DETERMINING THE AMPLITUDE IMBALANCE AT THE RECEIVING END AND QUADRATURE ERROR IN A MULTI-CARRIER SYSTEM
Abstract:
The aim of the invention is to determine the user data constellation of a multi-carrier signal at the receiving end. Said signal is QAM modulated in the 2K mode according to the DVB-T standard and is provided with a central carrier that is situated in the centre of the individual carriers and is temporarily modulated with user data and temporarily represents a distributed pilot. To resolve the aim of the invention, the appearance frequency of all I/Q values pertaining to the portion of user data belonging to the central carrier is detected and the centre of said user data constellation is then detected.