Error correcting decoder and decoding method employing reliability based erasure decision-making in cellular communication system
AssigneeHughes Aircraft Company
InventorJohn D. Kaewell, Jr.
Life of this patent
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Abstract
A receiver (30) in a digital communication system determines the phase error magnitude (60) and the magnitude error (54) for each received channel symbol and selects Reed-Solomon symbol erasures from the magnitude error and phase error magnitude values as a function of mobile unit speed (52) which is determined from demodulator data. The selected symbol erasures are implemented (78) in a Reed-Solomon decoder resulting in improved decoding performance.
Claims18
A receiver for a digital cellular communication system in which a mobile unit and a base station unit are linked, the receiver being included in at least one of the mobile and the base station units and comprising:
- means for receiving transmitted signals encoded with a preselected trellis or block code;
- means for demodulating the received signals to generate digital word signals for decoding;
- means for computing phase error magnitude for each channel symbol in the received signals;
- means for computing magnitude error for each channel symbol in the received signals;
- means for estimating mobile unit speed from demodulating data;
- and
- means for decoding the digital word signals in accordance with the phase error magnitude and the magnitude error as a function of the mobile unit speed.
A receiver for a digital cellular communication system in which a mobile unit and a base station unit are linked, the receiver being included in at least one of the mobile and the base station units and comprising:
- means for receiving transmitted signals encoded with the Reed-Solomon (R-S) code;
- means for demodulating the received signals to generate digital word signals for decoding;
- means for computing phase error magnitude for each channel symbol in the received signals;
- means for computing magnitude error for each channel symbol in the received signals.;
- means for estimating mobile unit speed from demodulating data;
- means for selecting R-S symbol erasures in each digital word in accordance with the phase error magnitude and the magnitude error as a function of the mobile unit speed;
- and
- means for R-S decoding the digital word signals in accordance with the selected R-S symbol erasures.
A method for operating a digital cellular receiver in a cellular communication system in which a mobile unit and a base station unit are linked, the receiver being included in at least one of the mobile and base station units, the steps of the method comprising:
- receiving transmitted signals encoded with the Reed-Solomon (R-S) code;
- demodulating the received signals to generate digital word signals for decoding;
- computing phase error magnitude for each channel symbol in the received signals;
- computing magnitude error for each channel symbol in the received signals;
- estimating mobile unit speed from demodulating data;
- selecting R-S symbol erasures in each digital word in accordance with the phase error magnitude and the magnitude error as a function of the mobile unit speed;
- and
- R-S decoding the digital word signals in accordance with the selected R-S symbol erasures.
A receiver for a digital cellular communication system in which a mobile unit and a base station unit are linked, the receiver being included in at least one of the mobile and the base station units and comprising:
- a circuit for receiving transmitted signals encoded with a preselected trellis or block code;
- a demodulator for demodulating the received signals to generate digital word signals for decoding;
- a system for computing phase error magnitude for each channel symbol, for computing magnitude error for each channel symbol, and for estimating mobile unit speed from demodulating data;
- and
- a decoder for decoding the digital word signals in accordance with the phase error magnitude and the magnitude error as a function of the mobile unit speed.
A receiver for a digital cellular communication system in which a mobile unit and a base station unit are linked, the receiver being included in at least one of the mobile and the base station units and comprising:
- a circuit for receiving transmitted signals encoded with the Reed-Solomon (R-S) code;
- a demodulator for demodulating the received signals to generate digital word signals for decoding;
- a system for computing phase error magnitude for each channel symbol in the received signals, for computing magnitude error for each channel symbol in the received signals, and for estimating mobile unit speed from demodulating data;
- a selector system for selecting R-S symbol erasures in each digital word in accordance with the phase error magnitude and the magnitude error as a function of the mobile unit speed;
- and
- a decoder for R-S decoding the digital word signals in accordance with the selected R-S symbol erasures.
Dependencies are inferred from the claim text.