Demodulator with individual bit-weighting algorithm
AssigneeVIA Telecom Co., Ltd.
InventorsInsung Kang, Qiang Shen, Tarun Tandon
Life of this patent
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Abstract
A method and system is disclosed for weighting soft values of a demodulated symbol. An incoming symbol is demodulated for obtaining a plurality of soft values associated with the incoming symbol based on a modulation constellation. An effective signal-to-noise ratio (SNR) of at least one soft value, which is to be a reference for decoding, is obtained, as well as effective SNRs of all other soft values. A set of weights are then calculated for the soft values based on a ratio between each SNR and the reference, wherein the weights are applied to the soft values based on the ratios for further decoding thereof.
Claims18
A method for weighting soft values of a demodulated symbol, the method comprising:
- demodulating an incoming symbol for obtaining a plurality of soft values associated with the incoming symbol based on a predetermined modulation constellation;
- calculating an effective signal-to-noise ratio (SNR) of each soft value;
- identifying a reference SNR among the calculated SNRs;
- calculating a set of weights for the soft values based on ratios between each SNR and the reference SNR,
- wherein the weights are applied to the soft values based on the calculated ratios for further decoding thereof.
A demodulation system comprising:
- a demodulator circuit for demodulating an incoming symbol for obtaining a plurality of soft values associated with the incoming symbol based on a predetermined modulation constellation;
- and
- individual bit weighting module for calculating an effective signal-to-noise ratio (SNR) of each soft value, identifying a reference SNR among the calculated SNRs, and calculating a set of weights for the soft values based on ratios between each SNR and the reference SNR,
- wherein the weights are applied to the soft values based on the calculated ratios for further decoding thereof.
A demodulation system comprising:
- means for demodulating an incoming symbol for obtaining a plurality of soft values associated with the incoming symbol based on a predetermined modulation constellation;
- means for calculating an effective signal-to-noise ratio (SNR) of each soft value, identifying a reference SNR among the calculated SNRs, and calculating a set of weights for the soft values based on ratios between each SNR and the reference SNR;
- and
- means for quantizing the demodulated incoming signal,
- wherein the weights are applied to the soft values based on the calculated ratios for further decoding thereof.
Dependencies are inferred from the claim text.