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
Apparatus and method for storing event information for an HVAC system
Fluid conduit with PTC fabric heating
Context-sensitive views
Trash receptacle
Thermoplastic resin composition
Disposable and tamper-resistant RFID lock
  Randomly Featured Patents
VSB mode selection system
Kaposi's sarcoma-associated herpes virus (KSHV) interferon consensus sequence binding protein (ICSBP) and uses thereof
Reversible detector for gaseous carbon dioxide
Vehicle front upper grille
Currency ordering by denomination
HCV core+1 protein, methods for diagnosis of HCV infections, prophylaxis, and for screening of anti-HCV agents
Semi-airgap manifold formation
Suction device and recording/reading apparatus
Pencil sharpener configured to work with a power drill
Electronic branch switching device