System and method for adaptive bit loading source coding via vector quantization
First Claim
1. A communication system, comprising,a data transmitter transmitting data using a multicarrier modulation;
- anda data receiver determining 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, wherein the vector quantization technique maps a vector corresponding to the received signal-to-noise ratio into a representation vector.
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Accused Products
Abstract
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.
13 Citations
18 Claims
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1. A communication system, comprising,
a data transmitter transmitting data using a multicarrier modulation; - and
a data receiver determining 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, wherein the vector quantization technique maps a vector corresponding to the received signal-to-noise ratio into a representation vector. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A receiver in a multicarrier modulation system, comprising,
an estimater estimating a received signal-to-noise ratio for at least one carrier of the multicarrier modulation system for data received from a data transmitter; - and
a vector quantizer determining a predetermined level of modulation for each carrier of the multicarrier modulation based on the received signal-to-noise ratio for the carrier using a vector quantization technique, wherein the vector quantization technique maps a vector corresponding to the received signal-to-noise ratio into a representation vector. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A multicarrier-modulation method, comprising,
estimating a received signal-to-noise ratio for at least one carrier of a multicarrier-modulation signal for data received from a data transmitter; - and
determining a predetermined level of modulation for each carrier of the multicarrier modulation based on the received signal-to-noise ratio for the carrier using a vector quantization technique, wherein the vector quantization technique maps a vector corresponding to the received signal-to-noise ratio into a representation vector. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification