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US 6,389,066 B1Granted
System and method for adaptive modification of modulated and coded schemes in a communication system
AssigneeLucent Technologies Inc.
InventorRichard P. Ejzak
Life of this patent
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Abstract
A system and method is provided having an adaptive channel coder and modulator, a channel decoder and demodulator connected to the adaptive channel coder and modulator, and a radio link protocol frame and channel decision unit connected to the adaptive channel coder and modulator.
Claims13
A communication system using radio link protocol frames to transmit a data stream, comprising:
- a first adaptive channel coder and modulator in which the first adaptive channel coder and modulator uses a combined header for transmitting at least one of the radio link protocol frames;
- a channel decoder and demodulator operably coupled to the first adaptive channel coder and modulator;
- a channel quality measurement circuit, operably coupled to the channel decoder and demodulator, that generates a cumulative Euclidean distance metric and determines a channel type request based on the cumulative Euclidean distance metric, and passes the channel type request to a second adaptive channel coder and modulator;
- and
- a radio link protocol frame and channel decision unit connected to the second adaptive channel coder and modulator.
2 more elements
A method for adaptively modifying a communication signal having a modulation scheme and a coding scheme in a communication system, the method comprising the steps of;
- establishing the modulation scheme and coding scheme of the communication signal with a first adaptive channel coder and modulator;
- transmitting the communication signal from the first adaptive channel coder and modulator to a channel decoder and demodulator;
- transmitting a channel type request from the channel decoder and demodulator to a radio link protocol frame and channel decision unit that is coupled to a second adaptive channel coder and modulator;
- determining control information for the communication signal with a channel quality measurement circuit that is in signal communication with the channel decoder and demodulator, wherein the step of determining comprises determining a decoder metric to generate a maximum likelihood path, generating a cumulative Euclidean distance metric corresponding to a decoded trellis path, calculating the channel type request based on the cumulative Euclidean distance metric, and passing the channel type request to the second adaptive channel coder and modulator;
- and
- modifying the modulation scheme and coding scheme of the communication signal with the second adaptive channel coder and modulator in response to the channel type request.
3 more elements
A communication system comprising:
- a first adaptive rate channel coder and modulator arranged and constructed to transmit, according to a first channel type, at least one radio link protocol frame on a channel;
- a channel decoder and demodulator arranged and constructed to receive the at least one radio link protocol frame and to determine the first channel type;
- a channel quality measurement circuit, operably coupled to the channel decoder and demodulator, wherein the channel quality measurement circuit is arranged and constructed to determine a channel quality measurement for the at least one radio link protocol frame, to pass a channel type request for a second channel type, based on the channel quality measurement, to a second adaptive rate channel coder and modulator, and to identify transition points between different channel types.
Dependencies are inferred from the claim text.