Communication channel estimation
AssigneeQUALCOMM Incorporated
InventorPeter Gaal
Life of this patent
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Abstract
A channel estimator is configured to determine channel estimate parameters indicative of characteristics of a wireless communication channel based on a received signal comprising a known transmitted signal and a noise signal. The channel estimator is configured to apply, to the received signal, a frequency domain representation inverse of a combination of a known signal factor as a function of frequency and a noise factor.
Claims67
A channel estimator for determining channel estimate parameters indicative of characteristics of a wireless communication channel based on a received signal, the channel estimator comprising:
- a module for determining a known transmitted signal and a noise signal, the channel estimator configured to apply an equalization function to the received signal, wherein the equalization function comprises a frequency domain representation with respect to an inverse of a combination of a known signal factor associated with the known transmitted signal and a noise factor associated with the noise signal, wherein the known signal factor is a function of frequency, wherein the known signal factor comprises a recreated transmitted signal that is generated using a substantially same technique that was used by a transmitting device.
A method for determining channel estimate parameters indicative of characteristics of a wireless communication channel based on a received signal, the method comprising:
- determining a known transmitted signal and a noise signal;
- and
- applying an equalization function to the received signal, wherein the equalization function comprises a frequency domain representation with respect to an inverse of a combination of a known signal factor associated with the known transmitted signal and a noise factor associated with the noise signal, wherein the known signal factor is a function of frequency, wherein the known signal factor comprises a recreated transmitted signal that is generated using a substantially same technique that was used by a transmitting device.
A channel estimator for generating a channel estimate based on channel parameters and noise reduction parameters and for application by a channel compensator to a received signal comprising a known transmitted signal and a noise signal, the channel estimator comprising:
- a channel analyzer configured to determine channel parameters indicative of characteristics of a wireless communication channel based on the received signal and configured to apply an equalization function to the received signal, wherein the equalization function comprises a frequency domain representation with respect to an inverse of a combination of a known signal factor associated with the known transmitted signal and a noise factor associated with the noise signal, wherein the known signal factor is a function of frequency, wherein the known signal factor comprises a recreated transmitted signal that is generated using a substantially same technique that was used by a transmitter;
- a signal path processor configured to generate noise reduction parameters for application to the channel parameters, the signal path processor comprising:
- a searcher configured to identify signal paths from the transmitter to the signal path processor;
- and
- a windowing filter configured to generate noise reduction parameters that, when applied to the channel parameters, at least partially attenuate the channel parameters within filtered time windows between the time delays of the identified signal paths.
A method for generating a channel estimate for application by a channel compensator, the method comprising:
- determining channel parameters indicative of characteristics of a wireless communication channel based on a received signal comprising a known transmitted signal and a noise signal, by applying, to the received signal, a frequency domain representation with respect to an inverse of a combination of a known signal factor associated with the known transmitted signal and a noise factor associated with the noise signal, wherein the known signal factor is a function of frequency;
- and
- generating noise reduction parameters by identifying a plurality of signal paths from a transmitter to a receiver, each signal paths having a time delay relative to a reference and generating the noise parameters that, when applied to the channel parameters, at least partially attenuate the channel parameters within filtered time windows between the time delays of the identified signal paths, wherein the identified signal paths correspond to a same transmitted signal.
An apparatus for determining channel estimate parameters indicative of characteristics of a wireless communication channel based on a received signal, comprising:
- means for determining a known transmitted signal and a noise signal;
- and
- means for applying an equalization function to the received signal, wherein the equalization function comprises a frequency domain representation with respect to an inverse of a combination of a known signal factor associated with the known transmitted signal and a noise factor associated with the noise signal, wherein the known signal factor is a function of frequency, wherein the known signal factor comprises a recreated transmitted signal that is generated using a substantially same technique that was used by a transmitting device.
A computer program product for determining channel estimate parameters indicative of characteristics of a wireless communication channel based on a received signal, comprising:
- a non-transitory computer-readable medium comprising code for:
- determining a known transmitted signal and a noise signal;
- and
- applying an equalization function to the received signal, wherein the equalization function comprises a frequency domain representation with respect to an inverse of a combination of a known signal factor associated with the known transmitted signal and a noise factor associated with the noise signal, wherein the known signal factor is a function of frequency, wherein the known signal factor comprises a recreated transmitted signal that is generated using a substantially same technique that was used by a transmitting device.
An apparatus for generating a channel estimate for application by a channel compensator, comprising:
- means for determining channel parameters indicative of characteristics of a wireless communication channel based on a received signal comprising a known transmitted signal and a noise signal, by applying, to the received signal, a frequency domain representation with respect to an inverse of a combination of a known signal factor associated with the known transmitted signal and a noise factor associated with the noise signal, wherein the known signal factor is a function of frequency;
- and
- means for generating noise reduction parameters by identifying a plurality of signal paths from a transmitter to a receiver, each signal paths having a time delay relative to a reference and generating the noise parameters that, when applied to the channel parameters, at least partially attenuate the channel parameters within filtered time windows between the time delays of the identified signal paths, wherein the identified signal paths correspond to a same transmitted signal.
A computer program product for generating a channel estimate for application by a channel compensator, comprising:
- a non-transitory computer-readable medium comprising code for:
- determining channel parameters indicative of characteristics of a wireless communication channel based on a received signal comprising a known transmitted signal and a noise signal, by applying, to the received signal, a frequency domain representation with respect to an inverse of a combination of a known signal factor associated with the known transmitted signal and a noise factor associated with the noise signal, wherein the known signal factor is a function of frequency;
- and
- generating noise reduction parameters by identifying a plurality of signal paths from a transmitter to a receiver, each signal paths having a time delay relative to a reference and generating the noise parameters that, when applied to the channel parameters, at least partially attenuate the channel parameters within filtered time windows between the time delays of the identified signal paths, wherein the identified signal paths correspond to a same transmitted signal.
Dependencies are inferred from the claim text.