Demodulator circuit
AssigneeConexant Systems, Inc.
InventorMatthew James Collins
Life of this patent
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Abstract
The invention relates to a demodulator circuit in a communication system using a multi-carrier modulation scheme. The demodulator uses channel state information for respective carriers in the multi-carrier modulation to de-map the received data.
Claims5
A demodulator circuit for demodulating a multi-carrier modulated signal, having a de-mapping means for de-mapping the received signal to generate decision data, the decision data being generated in a manner dependent on channel state information for the respective signal carrier;
- and a decoder for decoding the received bits from the decision data received from the de-mapping means,
- wherein the decision data are determined on the basis of a comparison between channel state information for the respective signal carrier and a threshold set by the mean channel state information of a plurality of available signal carriers.
A demodulator circuit as claimed in any preceding claim, comprising means for determining provisional decision data for a signal carrier, based on the detected signal carrier position, and means for adjusting the provisional decision data, based on said comparison between channel state information for the respective signal carrier and the threshold set by the mean channel state information of a plurality of available signal carriers.
A method of determining decision data for an information signal on a sub-carrier of a multi-carrier modulated signal, the method comprising:
- determining provisional decision data, based on the detected sub-carrier position relative to a constellation grid, and
- adjusting the provisional decision data, based on a comparison between channel state information for the respective sub-carrier and a threshold value,
- said threshold value being set relative to a mean channel state information of a plurality of sub-carriers.
Dependencies are inferred from the claim text.