Resources Contact Us Home
System and method for adaptive bit loading source coding via vector quantization

Image Number 5 for United States Patent #7408998.

A communication system includes a data transmitter and a data receiver in which the data transmitter transmits data using a multicarrier modulation, such as an OFDM modulation technique. The data receiver determines a predetermined level of modulation for at least one carrier of the multicarrier modulation corresponding to a received signal-to-noise ratio for the carrier using a vector quantization technique. The predetermined level of modulation for each carrier is based on an index to a codeword in a codebook corresponding to the signal-to-noise ratio for the carrier. The index to the codeword is a nearest neighbor to a vector corresponding to the signal-to-noise ratio for the carrier, and the codeword for each predetermined level of modulation is determined based on an adaptive-bit-loading technique. The data receiver transmits the index to the codeword for each carrier to the data transmitter in order to update the modulation at the data transmitter.

  Recently Added Patents
Semiconductor devices and methods for changing operating characteristics and semiconductor systems including the same
Avalanche photo diode and method of manufacturing the same
In-vehicle communication system and method of operation
Support member, rotation device comprising such a support and rolling bearing assembly including such a detection device
Enhancement of semiconducting photovoltaic absorbers by the addition of alkali salts through solution coating techniques
Methods of packaging imager devices and optics modules, and resulting assemblies
Target trading system and method
  Randomly Featured Patents
Automatic focusing apparatus for automatically matching focus in response to video signal based on extracted high frequency component of non-linear processed luminance signal
Component subjected to thermal stresses and having parts for intended breakage
Process for recovering metals and for removing sulfur from materials containing them by means of an oxidative extraction
Method of treating alpha-methylbenzyl alcohol dehydration residues
Photosensitive recording material having an N-aryl carbazole p-type charge transport compound
Calendar mechanism for timepieces
Combined wrist watch and arm band
Process for the preparation of carbide-boride products
Metrological apparatus
Flocculating reagent