LMS-based channel estimation
AssigneeAdvanced Micro Devices, Inc.
InventorsMichael Schmidt, Menno Mennenga, Thomas Hanusch
Life of this patent
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Abstract
A data communications device and method is provided that apply an LMS (Least Mean Square) channel estimation. A coefficient calculation unit generates a signal that represents at least one channel coefficient that is indicative of a property of the channel such as its finite impulse response. Further, an error calculation unit generates an error signal. Dependent on the error signal, the channel coefficients are updated by performing the LMS algorithm using a step size of two to a negative integer power. This allows for a simple, less complex implementation, and may be applied in a wireless local area network receiver for adjusting filter coefficients.
Claims64
A data communications device for use in a communications system, the data communications device having a channel estimation unit comprising:
- a coefficient calculation unit for generating a signal representing at least one channel coefficient indicative of a property of a channel in said communications system;
- and
- an error calculation unit for generating an error signal indicative of an error of the generated at least one channel coefficient;
- wherein said coefficient calculation unit is connected to receive said error signal and update the at least one channel coefficient dependent thereon by performing an LMS (Least Mean Square) algorithm having a step size of two to a negative integer power.
A WLAN (Wireless Local Area Network) receiver comprising:
- a coefficient calculation unit for generating a signal representing at least one channel coefficient indicative of a property of a channel in a WLAN system;
- and
- an error calculation unit for generating an error signal indicative of an error of the generated at least one channel coefficient;
- wherein said coefficient calculation unit is connected to receive said error signal and update the at least one channel coefficient dependent thereon by performing an LMS (Least Mean Square) algorithm having a step size of two to a negative integer power.
An integrated circuit chip for performing a channel estimation in a data communications device, the integrated circuit chip comprising:
- coefficient calculation circuitry for generating a signal representing at least one channel coefficient indicative of a property of a channel;
- and
- error calculation circuitry for generating an error signal indicative of an error of the generated at least one channel coefficient;
- wherein said coefficient calculation circuitry is connected to receive said error signal and update the at least one channel coefficient dependent thereon by performing an LMS (Least Mean Square) algorithm having a step size of two to a negative integer power.
A method of performing a channel estimation in a data communications device by generating at least one channel coefficient indicative of a property of a channel, the method comprising:
- determining an error of the generated channel coefficient;
- and
- updating the channel coefficient by performing an LMS (Least Mean Square) algorithm having a step size of two to a negative integer power.
Dependencies are inferred from the claim text.