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US 8,982,866 B1Granted
Data channel noise estimation using control channel
AssigneeMarvell International Ltd.
InventorsGil Katzir, Shimon Moshavi, Nimrod Mesika
Life of this patent
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Abstract
A method includes receiving a Code-Division Multiple Access (CDMA) signal carrying at least a data channel, a pilot channel and a control channel. A first noise level is estimated on the pilot channel. A second noise level is estimated on the control channel. The first estimated noise level and the second estimated noise level are combined to produce a noise estimate of noise on the data channel.
Claims18
A method, comprising:
- receiving a Code-Division Multiple Access (CDMA) signal carrying at least a data channel, a pilot channel that is spread using a first spread-spectrum code having a first spreading factor, and a control channel that is spread using a second spread-spectrum code having a second spreading factor, different from the first spread-spectrum code;
- estimating a first noise level of noise on the pilot channel;
- estimating a second noise level of noise on the control channel;
- combining the first noise level and the second noise level, by weighting the first noise level based on the first spreading factor and weighting the second noise level based on the second spreading factor, so as to produce a noise estimate for the data channel;
- calculating a Signal to Noise Ratio (SNR) for the data channel based on the noise estimate produced from the first noise level and the second noise level;
- and
- determining and reporting a Channel Quality Indicator (CQI) based on the calculated SNR.
4 more elements
An apparatus, comprising:
- a receiver front end configured to receive a Code-Division Multiple Access (CDMA) signal carrying at least a data channel, a pilot channel that is spread using a first spread-spectrum code having a first spreading factor, and a control channel that is spread using a second spread- spectrum code having a second spreading factor, different from the first spread-spectrum code;
- and
- processing circuitry configured to estimate a first noise level of noise on the pilot channel, to estimate a second noise level of noise on the control channel, to combine the first noise level and the second noise level, by weighting the first noise level based on the first spreading factor and weighting the second noise level based on the second spreading factor, so as to produce a noise estimate for the data channel, to calculate a Signal to Noise Ratio (SNR) for the data channel based on the noise estimate produced from the first noise level and the second noise level, and to determine and report a Channel Quality Indicator (CQI) based on the calculated SNR.
Dependencies are inferred from the claim text.