Adaptive channel estimation thresholds in a layered modulation system
First Claim
1. A method of adapting a channel estimation threshold value in a layered modulation system, the method comprising:
- determining a quality of service from a base layer of a received OFDM symbol modulated with layered modulation; and
varying the channel estimation threshold value based on the quality of service.
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Abstract
Dynamic channel estimation thresholds allow for determining optimal threshold values for channel estimation in a layered-modulation wireless communication system. A channel estimation threshold can be used to remove or otherwise filter out channel estimate components that may be significantly influenced by noise. The channel estimation threshold value can be used to generate a refined channel estimate that is used in decoding multiple layers of a layered modulation signal. The channel estimation threshold value can be varied based on the performance of the various signal layer decoders. The adaptive channel estimation threshold provides for decoding a base layer based on an optimal threshold value for the base layer; determining an error rate associated with decoding the base layer; and using an optimal threshold value for an enhancement layer in a channel estimation algorithm if the error rate is lower than a predetermined level.
103 Citations
31 Claims
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1. A method of adapting a channel estimation threshold value in a layered modulation system, the method comprising:
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determining a quality of service from a base layer of a received OFDM symbol modulated with layered modulation; and
varying the channel estimation threshold value based on the quality of service. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of adapting a channel estimation threshold value in a layered modulation system, the method comprising:
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a) setting a threshold coefficient to a value that is optimized for a base layer decoder;
b) determining an energy estimate from a turbo decoder of the base layer; and
c) setting threshold coefficient to a value optimized for an enhancement layer decoder if the energy estimate is greater than a lower boundary value. - View Dependent Claims (10, 11, 12, 13)
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14. A receiver in a layered modulation system, the receiver comprising:
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a RF front end configured to receive a layered modulation symbol over a wireless link;
a channel estimator coupled to the RF front end and configured to generate a channel estimate based on the layered modulation symbol and a variable channel estimation threshold value;
a symbol deinterleaver coupled to the RF front end and configured to extract a base layer symbol and an enhancement layer symbol from the layered modulation symbol;
a base layer decoder coupled to the symbol deinterleaver and configured to determine a base layer data from the base layer symbol and the channel estimate; and
an enhancement layer decoder coupled to the symbol deinterleaver and configured to determine an enhancement layer data from the enhancement layer symbol and the channel estimate. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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22. A processor readable storage device configured to store one or more processor usable instructions, the instructions comprising:
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determining a quality of service from a base layer of a received OFDM symbol modulated with layered modulation; and
varying the channel estimation threshold value based on the quality of service. - View Dependent Claims (23, 24)
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25. A receiver in a layered modulation system, the receiver comprising:
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means for determining a quality of service from a base layer of a received OFDM symbol modulated with layered modulation; and
means for varying the channel estimation threshold value based on the quality of service. - View Dependent Claims (26, 27, 28)
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29. A receiver in a layered modulation system, the receiver comprising:
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means for setting a threshold coefficient to a first value;
means for determining an energy estimate from a turbo decoder of a base layer; and
means for setting the threshold coefficient to a second value if the energy estimate is greater than a lower boundary value. - View Dependent Claims (30, 31)
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Specification