CN114944845B - Image interference suppression method and device, electronic equipment and low/zero intermediate frequency receiver - Google Patents
Image interference suppression method and device, electronic equipment and low/zero intermediate frequency receiver Download PDFInfo
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Abstract
The invention discloses an image interference suppression method, electronic equipment, a computer readable storage medium, an image interference suppression device, a low intermediate frequency receiver and a zero intermediate frequency receiver, wherein the method comprises the following steps: acquiring a receiving signal, performing I/Q demodulation on the receiving signal to obtain an in-phase component signal and a quadrature component signal, and obtaining an initial amplitude error and an initial phase error according to the in-phase component signal and the quadrature component signal; estimating the signal strength of the received signal according to the in-phase component signal and the orthogonal component signal to obtain received signal strength indication information; obtaining a word length difference value and an adjustment value according to the received signal strength indication information, and respectively processing the initial amplitude error and the initial phase error according to the word length difference value and the adjustment value to obtain a final amplitude error and a final phase error; and respectively compensating the in-phase component signal and the quadrature component signal according to the final amplitude error and the final phase error so as to inhibit image interference. The method can carry out image interference suppression with higher accuracy and stability.
Description
Technical Field
The invention relates to the technical field of digital signal processing, in particular to an image interference suppression method, electronic equipment, a computer readable storage medium, an image interference suppression device, a low intermediate frequency receiver and a zero intermediate frequency receiver.
Background
In the related art, in a low intermediate frequency or zero intermediate frequency receiver employing direct down-conversion, a complex signal after down-conversion can be represented by an in-phase component I and a quadrature component Q. However, due to the unstable parameters of analog devices such as a local oscillator, a mixer, an automatic control circuit, a filter, a digital-to-analog converter and the like, amplitude and phase imbalance may exist in I and Q components, and the direct result of the I/Q imbalance is image interference, that is, the down-conversion operation moves an interference signal at an image into a band to form image interference.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, a first object of the present invention is to provide an image interference suppression method for suppressing image interference.
A second object of the present invention is to provide an electronic device.
A third object of the invention is to propose a computer-readable storage medium.
A fourth object of the present invention is to provide an image rejection apparatus.
A fifth object of the present invention is to provide a low intermediate frequency receiver.
A sixth object of the present invention is to provide a zero intermediate frequency receiver.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides an image interference suppression method, where the method includes: acquiring a receiving signal, performing I/Q demodulation on the receiving signal to obtain an in-phase component signal and an orthogonal component signal, and obtaining an initial amplitude error and an initial phase error according to the in-phase component signal and the orthogonal component signal; estimating the signal intensity of the received signal according to the in-phase component signal and the orthogonal component signal to obtain received signal intensity indication information; normalizing the initial amplitude error and the initial phase error, wherein the normalizing comprises obtaining a word length difference value and an adjustment value according to the received signal strength indication information, and respectively processing the initial amplitude error and the initial phase error according to the word length difference value and the adjustment value to obtain a final amplitude error and a final phase error; and respectively compensating the in-phase component signal and the quadrature component signal according to the final amplitude error and the final phase error so as to inhibit image interference.
According to the image interference suppression method provided by the embodiment of the invention, firstly, a received signal is obtained, I/Q demodulation is carried out on the received signal to obtain an in-phase component signal and a quadrature component signal, and an initial amplitude error and an initial phase error are obtained according to the in-phase component signal and the quadrature component signal; estimating the signal strength of the received signal according to the in-phase component signal and the orthogonal component signal to obtain the strength indication information of the received signal; respectively carrying out normalization processing on the initial amplitude error and the initial phase error according to the received signal strength indication information to obtain a final amplitude error and a final phase error; and respectively compensating the in-phase component signal and the quadrature component signal according to the final amplitude error and the final phase error so as to inhibit image interference. Therefore, the image interference can be inhibited, in the process of inhibiting the image interference, the signal intensity of the received signal is estimated according to the in-phase component signal and the orthogonal component signal, and the initial amplitude error and the initial phase error are normalized according to the received signal intensity indicating information obtained by estimation to obtain the final amplitude error and the final phase error, so that the condition that the accuracy of the amplitude error and the phase error is lowered due to the large change of the amplitude of the received signal is avoided, and the accuracy and the stability of the image interference inhibiting method are improved.
In addition, the image interference suppression method proposed by the above embodiment of the present invention may further have the following additional technical features:
in one embodiment of the present invention, the initial amplitude error and the initial phase error are calculated according to the following formula: alpha ≈ (I') 2 -(Q′) 2 θ ≈ -2 × I '× Q', where α is the initial amplitude error, θ is the initial phase error, I 'is the in-phase component signal, and Q' is the quadrature component signal.
In one embodiment of the present invention, the received signal strength indication information is calculated according to the following formula: RSSI = (I') 2 +(Q′) 2 Wherein, RSSI is the received signal strength indication information, I 'is the in-phase component signal, and Q' is the quadrature component signal.
In an embodiment of the present invention, obtaining a word length difference value and an adjustment value according to the received signal strength indication information, and respectively processing the initial amplitude error and the initial phase error according to the word length difference value and the adjustment value, includes: determining the most significant word length and the target significant word length of the received signal strength indication information; determining the word length difference between the most significant word length and the target significant word length; after the received signal strength indication information is shifted to the right by the word length difference value, acquiring the adjustment value according to the shifted received signal strength indication information; and respectively estimating the initial amplitude error and the initial phase error according to the adjustment value and the word length difference value.
In one embodiment of the present invention, estimating the initial amplitude error according to the adjustment value and the word length difference value comprises: determining a first product result between the initial amplitude error and the adjustment value; and right shifting the word length difference value of the first product result to obtain the final amplitude error.
In one embodiment of the present invention, estimating the initial phase error according to the adjustment value and the word length difference value comprises: determining a second product result between the initial phase error and the adjustment value; and right shifting the word length difference value of the second product result to obtain the final phase error.
In one embodiment of the invention, the in-phase component signal and the quadrature component signal are compensated separately according to:
wherein I "is the compensated in-phase component signal, Q" is the compensated quadrature component signal, I 'is the in-phase component signal, Q' is the quadrature component signal, α 'is the final amplitude error, and θ' is the final phase error.
In order to achieve the above object, a second embodiment of the present invention provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the computer program is executed by the processor, the electronic device implements the image-interference suppression method.
According to the electronic device of the embodiment of the invention, when the computer program is executed by the processor, the received signal is firstly obtained, the I/Q demodulation is carried out on the received signal, the in-phase component signal and the orthogonal component signal are obtained, and the initial amplitude error and the initial phase error are obtained according to the in-phase component signal and the orthogonal component signal; estimating the signal intensity of the received signal according to the in-phase component signal and the orthogonal component signal to obtain received signal intensity indication information; respectively carrying out normalization processing on the initial amplitude error and the initial phase error according to the received signal strength indication information to obtain a final amplitude error and a final phase error; and respectively compensating the in-phase component signal and the quadrature component signal according to the final amplitude error and the final phase error so as to inhibit image interference. Therefore, the image interference can be inhibited, in the process of inhibiting the image interference, the signal intensity of the received signal is estimated according to the in-phase component signal and the orthogonal component signal, and the initial amplitude error and the initial phase error are normalized according to the received signal intensity indicating information obtained by estimation to obtain the final amplitude error and the final phase error, so that the condition that the accuracy of the amplitude error and the phase error is lowered due to the large change of the amplitude of the received signal is avoided, and the accuracy and the stability of the image interference inhibiting method are improved.
In order to achieve the above object, a third embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the image rejection method.
A computer-readable storage medium according to an embodiment of the present invention has a computer program stored thereon, and when executed by a processor, first acquires a received signal, and performs I/Q demodulation on the received signal to obtain an in-phase component signal and a quadrature component signal, and obtains an initial amplitude error and an initial phase error from the in-phase component signal and the quadrature component signal; estimating the signal strength of the received signal according to the in-phase component signal and the orthogonal component signal to obtain the strength indication information of the received signal; respectively carrying out normalization processing on the initial amplitude error and the initial phase error according to the received signal strength indication information to obtain a final amplitude error and a final phase error; and respectively compensating the in-phase component signal and the quadrature component signal according to the final amplitude error and the final phase error so as to inhibit image interference. Therefore, the image interference can be inhibited, in the process of inhibiting the image interference, the signal intensity of the received signal is estimated according to the in-phase component signal and the orthogonal component signal, and the initial amplitude error and the initial phase error are normalized according to the received signal intensity indicating information obtained by estimation to obtain the final amplitude error and the final phase error, so that the condition that the accuracy of the amplitude error and the phase error is lowered due to the large change of the amplitude of the received signal is avoided, and the accuracy and the stability of the image interference inhibiting method are improved.
In order to achieve the above object, a fourth aspect of the present invention provides an image rejection apparatus, including: the demodulation module is used for acquiring a received signal and carrying out I/Q demodulation on the received signal to obtain an in-phase component signal and a quadrature component signal; the error calculation module is used for obtaining an initial amplitude error and an initial phase error according to the in-phase component signal and the quadrature component signal; the estimation module is used for estimating the signal strength of the received signal according to the in-phase component signal and the orthogonal component signal to obtain received signal strength indication information; a normalization processing module, configured to perform normalization processing on the initial amplitude error and the initial phase error, where the normalization processing includes obtaining a word length difference value and an adjustment value according to the received signal strength indication information, and processing the initial amplitude error and the initial phase error according to the word length difference value and the adjustment value, respectively, to obtain a final amplitude error and a final phase error; and the compensation module is used for respectively compensating the in-phase component signal and the orthogonal component signal according to the final amplitude error and the final phase error so as to inhibit image interference.
The image interference suppression device comprises a demodulation module, an error calculation module, an estimation module, a normalization processing module and a compensation module. The demodulation module is used for acquiring a received signal and performing I/Q demodulation on the received signal to obtain an in-phase component signal and a quadrature component signal; the error calculation module is used for obtaining an initial amplitude error and an initial phase error according to the in-phase component signal and the quadrature component signal; the estimation module is used for estimating the signal strength of the received signal according to the in-phase component signal and the orthogonal component signal to obtain received signal strength indication information; the normalization processing module is used for respectively carrying out normalization processing on the initial amplitude error and the initial phase error according to the received signal strength indication information to obtain a final amplitude error and a final phase error; and the compensation module is used for respectively compensating the in-phase component signal and the orthogonal component signal according to the final amplitude error and the final phase error so as to inhibit image interference. Therefore, the image interference can be inhibited, in the process of inhibiting the image interference, the signal intensity of the received signal is estimated according to the in-phase component signal and the orthogonal component signal, and the initial amplitude error and the initial phase error are normalized according to the received signal intensity indicating information obtained by estimation to obtain the final amplitude error and the final phase error, so that the condition that the accuracy of the amplitude error and the phase error is lowered due to the large change of the amplitude of the received signal is avoided, and the accuracy and the stability of the image interference inhibiting method are improved.
In order to achieve the above object, a fifth embodiment of the present invention provides a low if receiver, including the image rejection apparatus.
According to the low intermediate frequency receiver of the embodiment of the invention, the low intermediate frequency receiver comprises the image interference suppression device, and the suppression of the image interference can be realized through the demodulation module, the error calculation module, the estimation module, the normalization processing module and the compensation module in the device.
In order to achieve the above object, a sixth aspect of the present invention provides a zero intermediate frequency receiver, including the image rejection apparatus.
According to the zero intermediate frequency receiver of the embodiment of the invention, the zero intermediate frequency receiver comprises the image interference suppression device, and the suppression of the image interference can be realized through the demodulation module, the error calculation module, the estimation module, the normalization processing module and the compensation module in the device.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a functional block diagram of an image rejection method;
FIG. 2 is a flow chart of an image rejection method according to an embodiment of the present invention;
FIG. 3 is a functional block diagram of an exemplary image rejection method of the present invention;
FIG. 4 is a flow diagram of a normalization process of one embodiment of the present invention;
FIG. 5 is a schematic illustration of a normalization process of one example of the invention;
fig. 6 is a block diagram of the image rejection apparatus according to an embodiment of the present invention;
fig. 7 is a block diagram of a low if receiver according to an embodiment of the present invention;
fig. 8 is a block diagram of a zero if receiver according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.
In order to suppress the image disturbance, the image disturbance suppression method shown in fig. 1 may be adopted to compensate the in-phase component signal and the quadrature component signal according to the calculated amplitude error α and phase error θ. However, when the amplitude of the received signal varies greatly, the accuracy of the calculated amplitude error and phase error is very low, and the word length of the calculated amplitude error and phase error naturally increases, which results in a wider word length in the intermediate operation process and increases the complexity of implementation.
Thus, the present invention proposes an image interference suppression method, an electronic device, a computer-readable storage medium, an image interference suppression device, a low intermediate frequency receiver, a zero intermediate frequency receiver.
An image interference suppressing method, an electronic device, a computer-readable storage medium, an image interference suppressing apparatus, a low intermediate frequency receiver, and a zero intermediate frequency receiver according to embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 2 is a flowchart of an image rejection method according to an embodiment of the present invention.
As shown in fig. 2, the image interference suppression method according to the embodiment of the present invention includes the following steps:
s101, acquiring a receiving signal, performing I/Q demodulation on the receiving signal to obtain an in-phase component signal and a quadrature component signal, and obtaining an initial amplitude error and an initial phase error according to the in-phase component signal and the quadrature component signal.
Specifically, after obtaining a received signal and performing I/Q demodulation on the received signal, the theoretical expressions of the obtained in-phase component signal and quadrature component signal are as follows: i = a (t) cos ω t, Q = a (t) sin ω t. However, due to the instability of the parameters of analog devices such as a local oscillator, a mixer, an automatic control circuit, a filter, and a digital-to-analog converter, the in-phase component signal and the quadrature component signal may have unbalanced amplitudes and phases, so that I 'and Q' in the following formula occur:
wherein, I 'is the actually obtained in-phase component signal, and Q' is the actually obtained quadrature component signal。
Based on this, in order to eliminate the image interference, after obtaining the in-phase component signal and the quadrature component signal, it is necessary to first obtain an amplitude error α and a phase error θ, which are the initial amplitude error and the initial phase error, according to the in-phase component signal and the quadrature component signal. Specifically, the initial amplitude error and the initial phase error can be calculated according to the following formula: alpha ≈ (I') 2 -(Q′) 2 θ ≈ -2 × I '× Q', where α is an initial amplitude error, θ is an initial phase error, I 'is an in-phase component signal, and Q' is a quadrature component signal.
S102, estimating the signal strength of the received signal according to the in-phase component signal and the orthogonal component signal to obtain the received signal strength indication information.
Specifically, after the I/Q demodulation of the received signal is performed to obtain the in-phase component signal I 'and the quadrature component signal Q', the signal strength of the received signal may be estimated based on the in-phase component signal and the quadrature component signal.
The signal strength estimation of the received signal according to the in-phase component signal and the quadrature component signal may be performed before the initial amplitude error and the initial phase error are obtained according to the in-phase component signal and the quadrature component signal, may be performed after the initial amplitude error and the initial phase error are obtained according to the in-phase component signal and the quadrature component signal, or may be performed simultaneously with the initial amplitude error and the initial phase error obtained according to the in-phase component signal and the quadrature component signal.
And S103, carrying out normalization processing on the initial amplitude error and the initial phase error, wherein the normalization processing comprises obtaining a word length difference value and an adjusting value according to the received signal strength indication information, and respectively processing the initial amplitude error and the initial phase error according to the word length difference value and the adjusting value to obtain a final amplitude error and a final phase error.
Therefore, the initial amplitude error and the initial phase error can be normalized according to the intensity of the received signal, so that the problem that the accuracy of the amplitude error alpha and the accuracy of the phase error theta are lowered due to large change of the amplitude of the received signal is avoided, and the accuracy and the stability of the image interference suppression method provided by the embodiment of the invention are improved.
And S104, respectively compensating the in-phase component signal and the orthogonal component signal according to the final amplitude error and the final phase error so as to inhibit image interference.
Specifically, after the final amplitude error α 'and the final phase error θ' are obtained, the in-phase component signal and the quadrature component signal are compensated for, respectively, according to the following equation:
wherein, I "is the compensated in-phase component signal, Q" is the compensated quadrature component signal, I 'is the in-phase component signal, Q' is the quadrature component signal, α 'is the final amplitude error, and θ' is the final phase error.
Therefore, the image interference can be suppressed, in the process of suppressing the image interference, the signal intensity of the received signal is estimated according to the in-phase component signal and the orthogonal component signal, and the initial amplitude error and the initial phase error are normalized according to the received signal intensity indicating information obtained by estimation to obtain the final amplitude error and the final phase error, so that the low accuracy of the amplitude error alpha and the phase error theta caused by the large change of the amplitude of the received signal is avoided, and the accuracy and the stability of the image interference suppression method of the embodiment of the invention are improved.
In one embodiment of the present invention, referring to fig. 3, the received signal strength indication information is calculated according to the following formula:
RSSI＝(I′) 2 +(Q′) 2 ，
wherein, RSSI is the received signal strength indication information, I 'is the in-phase component signal, and Q' is the quadrature component signal.
Therefore, the received signal strength indication information can be quickly and accurately obtained through a simple method.
In an embodiment of the present invention, referring to fig. 4, the obtaining a word length difference and an adjustment value according to the received signal strength indication information, and respectively processing the initial amplitude error and the initial phase error according to the word length difference and the adjustment value specifically include the following steps:
s201, determining the most significant word length and the target significant word length of the received signal strength indication information.
Specifically, the most significant word length N is determined according to the RSSI, and a target significant word length K is preset.
It should be noted that the most significant word length N is determined by a comparison method, and as an example, if the RSSI is greater than 32768 and less than 65536, it is determined that N is 16 bits; if the RSSI is greater than 16384 and less than 32768, it is determined that N is 15 bits.
S202, determining a word length difference value between the highest effective word length and the target effective word length.
Specifically, after the maximum effective word length N and the target effective word length K are obtained, the word length difference is calculated according to the following formula: rightShift = N-K, where RightShift is the word length difference.
S203, right-shifting the rssi information by the word length difference, and then obtaining the adjustment value according to the rssi information after right-shifting.
Specifically, according to the word length difference RightShift, the RSSI is shifted to the right by RightShift bits so as to reserve the effective word length of the K target, and then the table look-up operation is carried out by using the received signal strength indication information of the K target effective word length to obtain an adjustment value
And S204, respectively estimating an initial amplitude error and an initial phase error according to the adjustment value and the word length difference value.
Specifically, after obtaining the adjustment value, referring to fig. 5, a first product result between the initial amplitude error and the adjustment value is determined, and then the first product result is right-shifted by the word length difference to obtain a final amplitude error, as shown in the following formula:
wherein, alpha' is the final amplitude error,
RightShift is the word length difference for the first product result.
Meanwhile, a second product result between the initial phase error and the adjustment value is also determined, and then the second product result is right-shifted by the word length difference value to obtain a final phase error, as shown in the following formula:
where θ' is the final phase error,
RightShift is the word length difference for the second product result.
It should be noted that, in the above formula,
is to
And
the calculation result of (c) is right shifted by the RightShift bit.
Therefore, the normalization of the initial amplitude error and the initial phase error can be realized, and the most significant bit of the RSSI is also acquired in the normalization process, so that the most significant bit is utilized to carry out right shift, and the dynamic word length adjustment is realized. The method can ensure that the word length is more accurately determined, and greatly reduces the complexity of the realization of the algorithm on the premise of not losing the performance.
To sum up, the image interference suppression method according to the embodiment of the present invention first obtains a received signal, performs I/Q demodulation on the received signal to obtain an in-phase component signal and a quadrature component signal, obtains an initial amplitude error and an initial phase error according to the in-phase component signal and the quadrature component signal, then performs signal strength estimation on the received signal according to the in-phase component signal and the quadrature component signal to obtain received signal strength indication information, performs normalization processing on the initial amplitude error and the initial phase error according to the received signal strength indication information, respectively obtains a final amplitude error and a final phase error, and finally performs compensation on the in-phase component signal and the quadrature component signal according to the final amplitude error and the final phase error, respectively, so as to suppress image interference. Therefore, the image interference can be inhibited, in the process of inhibiting the image interference, the signal intensity of the received signal is estimated according to the in-phase component signal and the orthogonal component signal, and the initial amplitude error and the initial phase error are normalized according to the received signal intensity indicating information obtained by estimation to obtain the final amplitude error and the final phase error, so that the condition that the accuracy of the amplitude error and the phase error is lowered due to the large change of the amplitude of the received signal is avoided, and the accuracy and the stability of the image interference inhibiting method are improved. In addition, the invention also obtains the most significant bit of the RSSI in the process of normalization so as to utilize the most significant bit to carry out right shift and realize dynamic word length adjustment. The method can ensure that the word length is more accurately determined, and greatly reduces the complexity of the realization of the algorithm on the premise of not losing the performance.
Further, the invention provides an electronic device.
In an embodiment of the present invention, an electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the image interference suppression method is implemented.
When the computer program on the electronic device is executed by the processor, the electronic device of the embodiment of the invention firstly acquires the received signal, performs I/Q demodulation on the received signal to obtain the in-phase component signal and the orthogonal component signal, obtains the initial amplitude error and the initial phase error according to the in-phase component signal and the orthogonal component signal, performs signal strength estimation on the received signal according to the in-phase component signal and the orthogonal component signal to obtain the received signal strength indication information, respectively performs normalization processing on the initial amplitude error and the initial phase error according to the received signal strength indication information to obtain the final amplitude error and the final phase error, and finally respectively performs compensation on the in-phase component signal and the orthogonal component signal according to the final amplitude error and the final phase error to suppress mirror image interference. Therefore, the image interference can be inhibited, in the process of inhibiting the image interference, the signal intensity of the received signal is estimated according to the in-phase component signal and the orthogonal component signal, and the initial amplitude error and the initial phase error are normalized according to the received signal intensity indicating information obtained by estimation to obtain the final amplitude error and the final phase error, so that the condition that the accuracy of the amplitude error and the phase error is lowered due to the large change of the amplitude of the received signal is avoided, and the accuracy and the stability of the image interference inhibiting method are improved. In addition, the invention also obtains the most significant bit of the RSSI in the process of normalization so as to utilize the most significant bit to carry out right shift and realize dynamic word length adjustment. The method can ensure that the word length is more accurately determined, and greatly reduces the complexity of the realization of the algorithm on the premise of not losing the performance.
Further, the invention proposes a computer-readable storage medium.
In an embodiment of the present invention, a computer program is stored on a computer-readable storage medium, and when executed by a processor, the computer program implements the image interference suppression method described above.
The computer readable storage medium of an embodiment of the present invention stores thereon a computer program, which, when executed by a processor, first obtains a received signal and performs I/Q demodulation on the received signal to obtain an in-phase component signal and a quadrature component signal, and obtains an initial amplitude error and an initial phase error from the in-phase component signal and the quadrature component signal, then performs signal strength estimation on the received signal according to the in-phase component signal and the quadrature component signal to obtain received signal strength indication information, performs normalization processing on the initial amplitude error and the initial phase error according to the received signal strength indication information to obtain a final amplitude error and a final phase error, and finally compensates the in-phase component signal and the quadrature component signal according to the final amplitude error and the final phase error to suppress image interference. Therefore, the image interference can be inhibited, in the process of inhibiting the image interference, the signal intensity of the received signal is estimated according to the in-phase component signal and the orthogonal component signal, and the initial amplitude error and the initial phase error are normalized according to the received signal intensity indicating information obtained by estimation to obtain the final amplitude error and the final phase error, so that the condition that the accuracy of the amplitude error and the phase error is lowered due to the large change of the amplitude of the received signal is avoided, and the accuracy and the stability of the image interference inhibiting method are improved. In addition, the invention also obtains the most significant bit of the RSSI in the process of normalization so as to utilize the most significant bit to carry out right shift and realize dynamic word length adjustment. The method can ensure that the word length is more accurately determined, and greatly reduces the complexity of the realization of the algorithm on the premise of not losing the performance.
Further, the invention provides an image interference suppression device.
Fig. 6 is a block diagram of the image disturbance rejection apparatus according to the embodiment of the present invention.
As shown in fig. 6, the image rejection apparatus 100 includes a demodulation module 10, an error calculation module 20, an estimation module 30, a normalization processing module 40, and an estimation module 50.
Specifically, the demodulation module 10 is configured to obtain a received signal, and perform I/Q demodulation on the received signal to obtain an in-phase component signal and a quadrature component signal; an error calculation module 20, configured to obtain an initial amplitude error and an initial phase error according to the in-phase component signal and the quadrature component signal; an estimation module 30, configured to perform signal strength estimation on the received signal according to the in-phase component signal and the quadrature component signal to obtain received signal strength indication information; a normalization processing module 40, configured to perform normalization processing on the initial amplitude error and the initial phase error, where the normalization processing includes obtaining a word length difference value and an adjustment value according to the received signal strength indication information, and processing the initial amplitude error and the initial phase error according to the word length difference value and the adjustment value, respectively, to obtain a final amplitude error and a final phase error; and the compensation module 50 is configured to compensate the in-phase component signal and the quadrature component signal according to the final amplitude error and the final phase error, respectively, so as to suppress image interference.
For another specific implementation of the image interference suppression device according to the embodiment of the present invention, reference may be made to the image interference suppression method described above.
The image interference suppression device of the embodiment of the invention can firstly obtain the received signal, perform I/Q demodulation on the received signal to obtain the in-phase component signal and the orthogonal component signal, obtain the initial amplitude error and the initial phase error according to the in-phase component signal and the orthogonal component signal, then perform signal strength estimation on the received signal according to the in-phase component signal and the orthogonal component signal to obtain the received signal strength indication information, respectively perform normalization processing on the initial amplitude error and the initial phase error according to the received signal strength indication information to obtain the final amplitude error and the final phase error, and finally respectively perform compensation on the in-phase component signal and the orthogonal component signal according to the final amplitude error and the final phase error to suppress the image interference. Therefore, the image interference can be inhibited, in the process of inhibiting the image interference, the signal intensity of the received signal is estimated according to the in-phase component signal and the orthogonal component signal, and the initial amplitude error and the initial phase error are normalized according to the received signal intensity indicating information obtained by estimation to obtain the final amplitude error and the final phase error, so that the condition that the accuracy of the amplitude error and the phase error is lowered due to the large change of the amplitude of the received signal is avoided, and the accuracy and the stability of the image interference inhibiting method are improved. In addition, the invention also obtains the most significant bit of the RSSI in the process of normalization so as to utilize the most significant bit to carry out right shift and realize dynamic word length adjustment. The method can ensure that the word length is more accurately determined, and greatly reduces the complexity of the realization of the algorithm on the premise of not losing the performance.
Further, the invention provides a low intermediate frequency receiver.
Fig. 7 is a block diagram of a low if receiver according to an embodiment of the present invention.
As shown in fig. 7, the low intermediate frequency receiver 1000 includes an image rejection apparatus 100.
The low intermediate frequency receiver of the embodiment of the invention improves the accuracy and stability of the image interference suppression method through the image interference suppression device, and reduces the realization complexity of the algorithm on the premise of not losing the performance.
Further, the invention provides a zero intermediate frequency receiver.
Fig. 8 is a block diagram of a zero intermediate frequency receiver according to an embodiment of the present invention.
As shown in fig. 8, the zero intermediate frequency receiver 1100 includes the image rejection apparatus 100.
The zero intermediate frequency receiver of the embodiment of the invention improves the accuracy and stability of the image interference suppression method through the image interference suppression device, and reduces the realization complexity of the algorithm on the premise of not losing the performance.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein may be considered as a sequential list of executable instructions for implementing logical functions, and may be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Further, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description herein, the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like refer to orientations and positional relationships based on the orientation shown in the drawings, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the description of the present specification, unless otherwise specified, the terms "mounted", "connected", "fixed", and the like are to be understood broadly, and may be, for example, fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (8)
1. An image reject method, comprising:
acquiring a receiving signal, performing I/Q demodulation on the receiving signal to obtain an in-phase component signal and a quadrature component signal, and obtaining an initial amplitude error and an initial phase error according to the in-phase component signal and the quadrature component signal;
estimating the signal intensity of the received signal according to the in-phase component signal and the orthogonal component signal to obtain received signal intensity indication information;
normalizing the initial amplitude error and the initial phase error, wherein the normalizing comprises obtaining a word length difference value and an adjustment value according to the received signal strength indication information, and respectively processing the initial amplitude error and the initial phase error according to the word length difference value and the adjustment value to obtain a final amplitude error and a final phase error;
respectively compensating the in-phase component signal and the orthogonal component signal according to the final amplitude error and the final phase error so as to inhibit image interference;
obtaining a word length difference value and an adjustment value according to the received signal strength indication information, and respectively processing the initial amplitude error and the initial phase error according to the word length difference value and the adjustment value, including:
determining the most significant word length and the target significant word length of the received signal strength indication information; determining the word length difference between the most significant word length and the target significant word length; after the received signal strength indication information is shifted to the right by the word length difference value, the adjustment value is obtained according to the received signal strength indication information after the right shift; estimating the initial amplitude error and the initial phase error respectively according to the adjusting value and the word length difference value;
estimating the initial amplitude error according to the adjustment value and the word length difference value, including:
determining a first product result between the initial amplitude error and the adjustment value; right shifting the word length difference value for the first product result to obtain the final amplitude error;
estimating the initial phase error according to the adjustment value and the word length difference value, including: determining a second product result between the initial phase error and the adjustment value; right shifting the second product result by the word length difference to obtain the final phase error;
compensating the in-phase component signal and the quadrature component signal, respectively, according to:
wherein I "is the compensated in-phase component signal, Q" is the compensated quadrature component signal, I 'is the in-phase component signal, Q' is the quadrature component signal, α 'is the final amplitude error, and θ' is the final phase error.
2. The image reject method of claim 1 wherein the initial amplitude error and the initial phase error are calculated according to the following equations:
α≈(I′) 2 -(Q′) 2 ，
θ≈-2*I′*Q′，
wherein α is the initial amplitude error, θ is the initial phase error, I 'is the in-phase component signal, and Q' is the quadrature component signal.
3. The image interference mitigation method of claim 1, wherein the received signal strength indication information is calculated according to the following equation:
RSSI＝(I′) 2 +(Q′) 2 ，
wherein, RSSI is the received signal strength indication information, I 'is the in-phase component signal, and Q' is the quadrature component signal.
4. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the image rejection method according to any one of claims 1-3.
5. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the image rejection method according to any one of claims 1 to 3.
6. An image rejection apparatus, comprising:
the demodulation module is used for acquiring a received signal and performing I/Q demodulation on the received signal to obtain an in-phase component signal and a quadrature component signal;
the error calculation module is used for obtaining an initial amplitude error and an initial phase error according to the in-phase component signal and the quadrature component signal;
the estimation module is used for estimating the signal strength of the received signal according to the in-phase component signal and the orthogonal component signal to obtain received signal strength indication information;
a normalization processing module, configured to perform normalization processing on the initial amplitude error and the initial phase error, where the normalization processing includes obtaining a word length difference value and an adjustment value according to the received signal strength indication information, and processing the initial amplitude error and the initial phase error according to the word length difference value and the adjustment value, respectively, to obtain a final amplitude error and a final phase error;
the compensation module is used for respectively compensating the in-phase component signal and the orthogonal component signal according to the final amplitude error and the final phase error so as to inhibit image interference;
the normalization processing module is specifically configured to:
determining the most significant word length and the target significant word length of the received signal strength indication information; determining the word length difference between the most significant word length and the target significant word length; after the received signal strength indication information is shifted to the right by the word length difference value, the adjustment value is obtained according to the received signal strength indication information after the right shift; estimating the initial amplitude error and the initial phase error respectively according to the adjusting value and the word length difference value;
estimating the initial amplitude error according to the adjustment value and the word length difference value, including:
determining a first product result between the initial amplitude error and the adjustment value; right shifting the word length difference value for the first product result to obtain the final amplitude error;
estimating the initial phase error according to the adjustment value and the word length difference value, including: determining a second product result between the initial phase error and the adjustment value; right-shifting the second product result by the word length difference to obtain the final phase error;
the compensation module is specifically configured to compensate the in-phase component signal and the quadrature component signal according to the following equation:
wherein I "is the compensated in-phase component signal, Q" is the compensated quadrature component signal, I 'is the in-phase component signal, Q' is the quadrature component signal, α 'is the final amplitude error, and θ' is the final phase error.
7. A low intermediate frequency receiver, characterized in that it comprises the image rejection means according to claim 6.
8. A zero intermediate frequency receiver, characterized in that it comprises the image rejection means according to claim 6.
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| EP1361655A1 (en) * | 2002-05-07 | 2003-11-12 | Semiconductor Ideas to The Market (ItoM) BV | Mirror suppression circuit in a quadrature demodulator |
| CN100420157C (en) * | 2003-02-19 | 2008-09-17 | 联发科技股份有限公司 | Method for eliminating mirror image interference in low-intermediate frequency receiver and relevant apparatus |
| US7349677B2 (en) * | 2004-04-08 | 2008-03-25 | Broadcom Corporation | Hardware efficient RF transceiver I/Q imbalance compensation based upon taylor approximation |
| JP2011160214A (en) * | 2010-02-01 | 2011-08-18 | Renesas Electronics Corp | Receiving apparatus and image rejection method |
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| CN107547458B (en) * | 2016-06-28 | 2021-04-20 | 中兴通讯股份有限公司 | Method and device for setting mirror image suppression parameters in IQ modulation and radio remote unit |
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