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;
- 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.
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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.
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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. - 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. - 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. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification