RADIO RECEIVER WITH RECONFIGURABLE BASEBAND CHANNEL FILTER
First Claim
1. A device, comprising:
- a radio receiver circuit configured to receive a radio frequency signal and produce a baseband signal as an output therefrom;
a channel filter having a bandwidth, the channel filter configured to receive the baseband output at a filter input and produce a filtered output at a filter output thereof;
a signal-to-noise ratio (SNR) estimator configured to estimate a pre-filtering and post-filtering signal-to-noise ratio of the baseband signal present at the channel filter input; and
a filter controller configured to receive the signal-to-noise ratio estimate and control the channel filter to adjust the bandwidth thereof in accord with the signal-to-noise ratio estimate.
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Accused Products
Abstract
A radio receiver circuit configured to receive a radio frequency signal and produce a baseband signal as an output therefrom has a channel filter having a bandwidth, the channel filter configured to receive the baseband output at a filter input and produce a filtered output at a filter output thereof. A signal-to-noise ratio (SNR) estimator prior to or after the channel filter or both is configured to estimate a signal-to-noise ratio of the baseband signal. A filter controller is configured to receive the signal-to-noise ratio estimate and control the channel filter to adjust the bandwidth thereof in accord with the signal-to-noise ratio estimate. This process thereby assists in improving SNR after the channel filtering by varying the channel filter bandwidth. This abstract is not to be considered limiting, since other embodiments may deviate from the features described in this abstract.
26 Citations
27 Claims
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1. A device, comprising:
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a radio receiver circuit configured to receive a radio frequency signal and produce a baseband signal as an output therefrom; a channel filter having a bandwidth, the channel filter configured to receive the baseband output at a filter input and produce a filtered output at a filter output thereof; a signal-to-noise ratio (SNR) estimator configured to estimate a pre-filtering and post-filtering signal-to-noise ratio of the baseband signal present at the channel filter input; and a filter controller configured to receive the signal-to-noise ratio estimate and control the channel filter to adjust the bandwidth thereof in accord with the signal-to-noise ratio estimate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method, comprising:
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at a radio receiver circuit, receiving a radio frequency signal and producing a baseband signal as an output therefrom; at a channel filter having a variable bandwidth, receiving the baseband output at a filter input and producing a filtered output at a filter output thereof; estimating a pre-filtering and post-filtering signal-to-noise ratio (SNR) of the baseband signal present at the channel filter input; and controlling the channel filter bandwidth in accord with the estimate of the SNR of the baseband signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method, comprising:
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at a radio receiver circuit, receiving a radio frequency signal and producing a baseband signal as an output therefrom; at a digital channel filter having a variable bandwidth, receiving the baseband output at a filter input and producing a filtered output at a filter output thereof; estimating a pre-filtering signal-to-noise ratio present at the channel filter input; estimating a post-filtering signal-to-noise ratio present at the channel filter output; and selecting a set of channel filter coefficients for use by the channel filter that determine the channel filter bandwidth in accord with the pre-filtering SNR estimate and the post-filtering SNR estimate of the baseband signal. - View Dependent Claims (23)
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24. A non-transitory computer readable storage medium storing information that when executed on one or more programmed processors carry out a process, comprising:
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receiving a baseband signal as an output from a radio receiver; filtering the baseband signal at a channel filter having a variable bandwidth by receiving the baseband output at a filter input and producing a filtered output at a filter output thereof; estimating a pre-filtering and post-filtering signal-to-noise ratio (SNR) of the baseband signal present at the channel filter input; and controlling the channel filter bandwidth in accord with the estimate of the SNR of the baseband signal. - View Dependent Claims (25, 26)
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27. A device, comprising:
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a radio receiver circuit configured to receive a radio frequency signal and produce a baseband signal as an output therefrom; channel filtering means having a bandwidth, the channel filtering means for receiving the baseband output at a filter input and producing a filtered output at a filter output thereof; signal-to-noise ratio (SNR) estimating means for estimating a pre-filtering and post-filtering signal-to-noise ratio of the baseband signal; and filter controlling means for receiving the signal-to-noise ratio estimate and controlling the channel filtering means to adjust the bandwidth thereof in accord with the signal-to-noise ratio estimate.
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Specification