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US 11,283,661 B2Granted
Method and apparatus for signal processing
AssigneeDatang Mobile Communications Equipment Co., Ltd.
InventorQinghua Li
Life of this patent
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Abstract
A method and an apparatus for signal processing: implementing step-by-step orthogonal decomposition of an original signal to be inputted; on the basis of the number of layers of orthogonal decomposition and the edge high frequency bandwidth of the original signal after orthogonal decomposition, generating a finite-length unit impulse response FIR filter; using the FIR filter to filter the edge high-frequency signal of the original signal; and, after passing the signal obtained after filtering and the low frequency signal obtained at each stage of orthogonal decomposition through an orthogonal filter bank, implementing signal synthesis processing.
Claims14
A method for signal processing, comprising:
- performing a multistage orthogonal decomposition for an original input signal to obtain multiple sub-band signals having small bandwidth;
- wherein the performing the multistage orthogonal decomposition for the original input signal to obtain the multiple sub-band signals with having small bandwidth comprises:
- decomposing the original input signal orthogonally to obtain a high-frequency sub-band signal in a first stage and a low-frequency sub-band signal in the first stage, wherein a sampling frequency distribution of the original input signal is fs, a frequency distribution of the high-frequency sub-band signal is
- (
- 1
- 2
-
- f
- s
- ,
- f
- s
- ]
- ,
- and a frequency distribution of the low-frequency sub-band signal is
- [
- 0
- ,
- 1
- 2
-
- f
- s
- ]
- ;
- shifting the high-frequency sub-band signal in the first stage to a zero-frequency sub-band signal in the first stage and then extracting the zero-frequency sub-band signal in the first stage by a factor of N to obtain a processed high-frequency sub-band signal in the first stage;
- determining if a first filter corresponding to the processed high-frequency sub-band signal in the first stage meets a preset requirement or not, wherein the preset requirement is that a bandwidth of a transition band of the first filter relative to a bandwidth of the processed high-frequency sub-band signal ranges from 20% to 30%;
- and
- when the first filter meets the preset requirement, determining that the multistage orthogonal decomposition is completed;
- when the first filter does not meet the preset requirement, repeating the first stage for a processed high-frequency sub-band signal in Mth stage until a first filter corresponding to a processed high-frequency sub-band signal in (M+1)th stage meets the preset requirement, wherein M>=1;
- filtering an edge high-frequency sub-band signal of the original input signal by using the first filter as a finite impulse response, FIR, filter, wherein the edge high-frequency sub-band is the processed high-frequency sub-band signal in the first stage when the first filer corresponding to the processed high-frequency sub-band signal in the first stage meets the preset requirement, or the edge high-frequency sub-band is the processed high-frequency sub-band signal in the (M+1)th stage when the first filter corresponding to the processed high-frequency sub-band signal in the first stage does not meet the preset requirement;
- and
- inputting a signal obtained through filtering the edge high-frequency sub-band signal and a low-frequency sub-band signal obtained through orthogonal decomposition in each stage into a quadrature filter bank and then combining signals output by the quadrature filter bank;
- wherein inputting the signal obtained through filtering the edge high-frequency sub-band signal and a low-frequency sub-band signal obtained through orthogonal decomposition in each stage into a quadrature filter bank and then combining signals output by the quadrature filter bank comprises:
- using the signal obtained through filtering the edge high-frequency sub-band signal as a high-frequency sub-band signal to be processed;
- interpolating the high-frequency sub-band signal to be processed by a factor of X, shifting a spectrum of interpolated signal to shift a center of the interpolated signal to fs/2Y−1, wherein Y is a number of a last stage of the multistage orthogonal decomposition, and then inputting shifted signal into a high-frequency quadrature filter for filtering the shifted signal to obtain a high-frequency sub-band signal to be combined;
- performing baseband sampling of a target low-frequency sub-band signal and then inputting sampled signal into a low-frequency quadrature filter for filtering the sampled signal to obtain a low-frequency sub-band signal to be combined, wherein the target low-frequency sub-band signal is a uncombined low-frequency sub-band signal with a highest number of stages after the multistage orthogonal decomposition;
- combining the high-frequency sub-band signal to be combined and the low-frequency sub-band signal to be combined to obtain a combination signal;
- and
- determining if there is any low-frequency sub-band signal which has not been combined with a high-frequency sub-band signal to be combined, and when there is, using the combination signal as a new high-frequency sub-band signal to be processed, and using a low-frequency sub-band signal, with a highest number of stages, in one or more low-frequency sub-band signals which have not been combined with the high-frequency sub-band signal to be combined, as a new target low-frequency sub-band signal, and performing the previous inputting and combining process for the new high-frequency sub-band signal to be processed and the new target low-frequency sub-band signal with repetition until there is no uncombined low-frequency sub-band signal, otherwise completing signal combination process.
37 more elements
An apparatus for signal processing, comprising:
- at least one processing unit;
- and
- at least one storage unit storing instructions;
- wherein the at least one processing unit is configured to execute instructions to:
- perform a multistage orthogonal decomposition for an original input signal to obtain multiple sub-band signals having small bandwidth;
- wherein the at least one processing unit is further configured to:
- decompose the original input signal orthogonally to obtain a high-frequency sub-band signal in a first stage and a low-frequency sub-band signal in the first stage, wherein a sampling frequency distribution of the original input signal is fs, a frequency distribution of the high-frequency sub-band signal is
- (
- 1
- 2
-
- f
- s
- ,
- f
- s
- ]
- ,
- and a frequency distribution of the low-frequency sub-band signal is
- [
- 0
- ,
- 1
- 2
-
- f
- s
- ]
- ;
- shift the high-frequency sub-band signal in the first stage to a zero-frequency sub-band signal in the first stage and then extract the zero-frequency sub-band signal in the first stage by a factor of N to obtain a processed high-frequency sub-band signal in the first stage;
- determine if a first filter corresponding to the processed high-frequency sub-band signal in the first stage meets a preset requirement or not, wherein the preset requirement is that a bandwidth of a transition band of the first filter relative to a bandwidth of the processed high-frequency sub-band signal ranges from 20% to 30%;
- and
- when the first filter meets the preset requirement, determine that the multistage orthogonal decomposition is completed;
- when the first filter does not meet the preset requirement, repeat the first stage for a processed high-frequency sub-band signal in Mth stage until a first filter corresponding to a processed high-frequency sub-band signal in (M+1)th stage meets the preset requirement, wherein M>=1;
- filter an edge high-frequency sub-band signal of the original input signal by using the first filter as a finite impulse response, FIR, filter, wherein the edge high-frequency sub-band is the processed high-frequency sub-band signal in the first stage when the first filer corresponding to the processed high-frequency sub-band signal in the first stage meets the preset requirement, or the edge high-frequency sub-band is the processed high-frequency sub-band signal in the (M+1)th stage when the first filter corresponding to the processed high-frequency sub-band signal in the first stage does not meet the preset requirement;
- and
- input a signal obtained through filtering the edge high-frequency sub-band signal and a low-frequency sub-band signal obtained through orthogonal decomposition in each stage into a quadrature filter bank and then combine signals output by the quadrature filter bank;
- wherein the at least one processing unit is further configured to:
- use the signal obtained through filtering the edge high-frequency sub-band signal as a high-frequency sub-band signal to be processed;
- interpolate the high-frequency sub-band signal to be processed by a factor of X, shift a spectrum of interpolated signal to shift a center of the interpolated signal to fs/2Y−1, wherein Y is a number of a last stage of the multistage orthogonal decomposition, and then input shifted signal into a high-frequency quadrature filter for filtering the shifted signal to obtain a high-frequency sub-band signal to be combined;
- perform baseband sampling of a target low-frequency sub-band signal and then input sampled signal into a low-frequency quadrature filter for filtering the sampled signal to obtain a low-frequency sub-band signal to be combined, wherein the target low-frequency sub-band signal is a uncombined low-frequency sub-band signal with a highest number of stages after the multistage orthogonal decomposition;
- combine the high-frequency sub-band signal to be combined and the low-frequency sub-band signal to be combined to obtain a combination signal;
- and
- determine if there is any low-frequency sub-band signal which has not been combined with a high-frequency sub-band signal to be combined, and when there is, use the combination signal as a new high-frequency sub-band signal to be processed, and use a low-frequency sub-band signal, with a highest number of stages, in one or more low-frequency sub-band signals which have not been combined with the high-frequency sub-band signal to be combined, as a new target low-frequency sub-band signal, and perform the previous inputting and combine process for the new high-frequency sub-band signal to be processed and the new target low-frequency sub-band signal with repetition until there is no uncombined low-frequency sub-band signal, otherwise complete signal combination process.
41 more elements
Dependencies are inferred from the claim text.