Reduction of Multipath Effects and Channel Distortion in Broadcast Television

A new technique for the adaptive recursive removal of “ghosts” is described. The system is based on look-up and decision-based adaptive assignment of the parameters of the recursive algorithm. A coarse channel estimation is used to select the initial parameter set. The algorithm requires a training signal in the vertical blanking interval. A master control algorithm keeps track of the echo-channel and system parameters, and makes the necessary control decisions and echo assignments. Two-axis synchronous detection is used and the echo reduction operation is performed in the baseband. The system is targeted for digital NTSC and IDTV/EDTV/HDTV receivers. It is primarily intended for use in the reception of terrestrial VHF/UHF distribution.

Published

1989-02

Content type

Original Research

DOI

10.5594/M00745

ISBN

978-1-61482-918-8