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
Image manipulating system and method
Method and system for quantifying viewer awareness of advertising images in a video source
Quick mounting device
Probe for ultrasound diagnostic apparatus
Buckle (tube)
Human embryonic stem cell methods and PODXL expression
Clamp for fence panels
  Randomly Featured Patents
Method for managing the allocation of resources to channel swarms in a peer-to-peer network
Pharmaceutical tablet
Method for efficiently identifying errant processes in a computer system by the operating system (OS) for error containment and error recovery
Pulsed laser source with adjustable grating compressor
Mutiple-clock controlled spatial light modulator
Recording medium having programs to display frames stored therein, game display method for executing frame-by-frame display, and game displaying apparatus
Method and system for managing images over a communication network
Trimmable wirewound resistance temperature transducer
Method and apparatus for routing and forwarding between virtual routers within a single network element
.beta.-1,3-Glucanpolyol, process for preparation thereof, and utilization thereof