US 6,320,903 B1 · Multi-carrier transmission systems

Abstract

A multi-carrier transmission system using orthogonal carriers with high order QAM constellations for the transmission of a plurality of bits per carrier and symbol. The system uses some method for the determination of an inverse channel model to be used in the equalization process. In the frequency domain, this is normally based on an estimate of the channel attenuation and phase for each carrier. A simplified method of equalization is provided which uses data at the symbol carrier input and output to adaptively estimate an inverse channel model.

Claims20

Dependent claims

A channel estimation and equalization system for adaptively updating frequency domain equalization parameters for an inverse channel model in a multi-carrier communications system, the channel estimation and equalization system comprising:

equalization means for equalizing parameters for the inverse channel model in the multi-carrier communications system and having an output;
detector/quantizer means for detecting and quantizing signals, said detector/quantizer means having an input connected to the output of said equalization means and an output;
and
modifying means having a first input connected to the output of said equalization means and a second input connected to the output of said detector/quantizer means for modifying equalization parameters in small steps so that said equalization means converges on the inverse channel model in the multi-carrier communications system.

1 more element

Dependencies are inferred from the claim text.

Multi-carrier transmission systems

Life of this patent

Multi-carrier transmission systems

Life of this patent

Abstract

Claims20