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
Packet bundling at the PDCP layer
Method and apparatus for accessing coconut water
High density molecular memory storage with read and write capabilities
Dual-box location aware and dual-bitmap voltage domain aware on-chip variation techniques
Small molecule inhibitors of kynurenine-3-monooxygenase
Health monitoring of applications in a guest partition
Electronic device with multi-orientation
  Randomly Featured Patents
Non-A, non-B, non-C, non-D, non-E hepatitis reagents and methods for their use
Staggerwing aircraft
Systems and methods for media summarization
Radio broadcast receiving apparatus and radio broadcast receiving method
Bi-directional connections for daisy-chained dampers
Ink-jet recording apparatus
Conduit for apparatus discharging a liquid
Pool leafing tool with stay-open basket feature
Semiconductor device and layout method of decoupling capacitor thereof
Buckslip lead generation system