CN113497633B - Method for improving IP2 index of zero intermediate frequency and low intermediate frequency architecture receiver and architecture thereof - Google Patents
Method for improving IP2 index of zero intermediate frequency and low intermediate frequency architecture receiver and architecture thereof Download PDFInfo
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- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
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Abstract
The application discloses a method for improving an IP2 index of a zero intermediate frequency and low intermediate frequency architecture receiver and an architecture thereof, wherein the method for improving the IP2 index of the zero intermediate frequency and low intermediate frequency architecture receiver comprises the following steps: detecting whether an interference signal outside a baseband exists or not by using a digital signal processing algorithm; responding to the existence of an interference signal outside the baseband, and judging whether the intensity of the interference signal outside the baseband is larger than a preset value; and controlling the gain of the radio frequency front end to suppress the interference signal in response to the intensity of the interference signal outside the base band being greater than a predetermined value. The strength of the interference signal outside the base band is judged to be larger than a preset value through a digital signal processing algorithm, namely, when the interference signal is strong, the gain of the front end of the radio frequency is controlled to inhibit the interference signal, and the sensitivity of the receiver architecture is not affected under the condition of normal no interference or small interference. In addition, the method has the advantages of low energy consumption, low implementation difficulty, no need of increasing hardware cost and easy popularization and application.
Description
Technical Field
The application belongs to the technical field of receiver architecture, and particularly relates to a method for improving an IP2 index of a zero intermediate frequency and low intermediate frequency architecture receiver and an architecture thereof.
Background
In modern receivers, zero intermediate frequency and low intermediate frequency architectures have many advantages, such as high integration, low cost, and simpler circuit structures. Even so, it still has some serious problems. The poor immunity is a major factor that prevents the large-scale application of such architecture receivers. External interference is classified into single-tone interference (generating Blocking problem) and multi-tone interference (generating IP2, IP3, etc.). The most serious of these problems result from the double tone interference, which generates low frequency interference signals at baseband due to the inherent structure of the zero intermediate frequency and low intermediate frequency receivers.
In the prior art, an attenuator is added before a direct mixer to improve the IP2 index, but the direct addition of the attenuator can reduce the sensitivity of the system, and the communication quality can be seriously affected when the useful signal is weaker.
Disclosure of Invention
The application provides a method and a framework for improving IP2 index of a zero intermediate frequency and low intermediate frequency framework receiver, which are used for solving the technical problem that the system sensitivity is affected by directly adding and starting an attenuator in the framework.
In order to solve the technical problems, one technical scheme adopted by the application is as follows: a method of boosting IP2 metrics for zero intermediate frequency and low intermediate frequency architecture receivers, comprising: detecting whether an interference signal outside a baseband exists or not by using a digital signal processing algorithm; responding to the existence of an interference signal outside the baseband, and judging whether the interference signal outside the baseband is larger than a preset value; and controlling the gain of the radio frequency front end to suppress the interference signal according to the fact that the intensity of the interference signal outside the base band is larger than a preset value.
According to an embodiment of the present application, the detecting the interference signal outside the baseband using the digital signal processing algorithm includes: and calculating the energy of the baseband outer frequency point by using a digital signal processing algorithm to obtain an out-of-band noise energy value and a received signal strength indication value.
According to an embodiment of the present application, the determining whether the interference signal outside the baseband is greater than a predetermined value includes: judging whether the signal strength indication value is larger than a first preset value or not at intervals of preset time, and judging whether the out-of-band noise energy value is larger than a second preset value or not; if the signal strength indication value is judged to be larger than the first preset value continuously for a first preset number of times, and the out-of-band noise energy value is judged to be larger than the second preset value continuously; the interfering signal outside the baseband is greater than the predetermined value.
According to an embodiment of the present application, the detecting the interference signal outside the baseband using the digital signal processing algorithm includes: the updated received signal strength indication value, the out-of-band noise energy value, and the received signal strength indication value are obtained using a digital signal processing algorithm.
According to an embodiment of the present application, the determining whether the strength of the interference signal outside the baseband is greater than a predetermined value includes: judging whether the updated received signal strength indication value is larger than a third preset value or not at preset time intervals, whether the received signal strength indication value is smaller than a fourth preset value or not, and whether the out-of-band noise energy value is larger than a fifth preset value or not; if the updated received signal strength indication value is judged to be greater than a third preset value continuously for a second preset number of times, the received signal strength indication value is smaller than the seventh preset value, and the out-of-band noise energy value is greater than the fifth preset value, the interference signal outside the base band is greater than the preset value; or, judging whether the received signal strength indication value is smaller than a sixth preset value or not at intervals of preset time, and judging whether the out-of-band noise energy value is smaller than a seventh preset value or not; if the received signal strength indication value is judged to be smaller than the sixth preset value continuously for a third preset time, and the out-of-band noise energy value is less than the seventh preset value; the strength of the interfering signal outside the baseband is greater than the predetermined value.
According to an embodiment of the present application, the determining whether the interference signal outside the baseband is greater than a predetermined value includes: judging whether the received signal strength indication value is larger than an eighth preset value or not at intervals of preset time, and judging whether the out-of-band noise energy value is larger than a ninth preset value or not; if the received signal strength indication value is judged to be larger than an eighth preset value and the out-of-band noise energy value is judged to be larger than a ninth preset value, the first counter is increased to a fourth preset number of times, and the second counter is increased once; if the received signal strength indication value is judged to be larger than an eighth preset value, the out-of-band noise energy value is smaller than a ninth preset value, the number of times of the first counter is larger than zero, the count of the first counter is reduced once, and if the count of the first counter is still larger than zero, the count of the second counter is increased once; and if the count of the second counter is larger than a fifth preset number of times, the strength of the interference signal outside the base band is larger than the preset value.
According to an embodiment of the present application, the controlling the gain of the radio frequency front end to suppress the interference signal in response to the strength of the interference signal outside the baseband being greater than a predetermined value includes: and in response to the intensity of the interference signal outside the base band being greater than a predetermined value, turning on an attenuator to suppress the interference signal.
According to an embodiment of the present application, if the attenuator includes at least a first stage attenuator and a second stage attenuator, the turning on the attenuator includes: judging whether the first-stage attenuator is started or not; the first-stage attenuator is not started, and then the first-stage attenuator is started; if the first-stage attenuator is already started, judging whether the second-stage attenuator is started or not; and if the second-stage attenuator is not started, starting the second-stage attenuator.
In order to solve the technical problems, another technical scheme adopted by the application is as follows: the zero intermediate frequency or low intermediate frequency architecture comprises a radio frequency low-pass filter, a low noise amplifier, a band-pass filter, an attenuator, a radio frequency integrated circuit and a digital signal processing chip, wherein at least one attenuator is arranged between the radio frequency low-pass filter and the radio frequency integrated circuit, and the digital signal processing chip controls the gain of the low noise amplifier and/or the attenuator by detecting an interference signal outside a baseband so as to inhibit the interference signal.
In order to solve the technical problems, another technical scheme adopted by the application is as follows: an apparatus having a storage function, the apparatus storing program data executable to implement a method as claimed in any one of the above.
The beneficial effects of this application are: compared with the prior art, the method has the advantages that the width of the interference signal is large, the interference signal is distributed inside and outside the base band, so that the interference signal outside the base band is judged through a digital signal processing algorithm, whether the interference signal exists in the base band can be judged, the gain of the radio frequency front end is controlled to inhibit the interference signal when the interference signal is strong, and the sensitivity of the receiver architecture is not affected under the condition of normal no interference or small interference. Compared with the method for judging the intensity of the interference signal in the band base by adopting a control means, the method is more accurate in judgment, can balance the sensitivity and the anti-interference capability of the receiver, is less in energy consumption and low in implementation difficulty, does not need to increase hardware cost, and is easier to popularize and apply.
Drawings
For a clearer description of the technical solutions in the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:
FIG. 1 is a flow chart of an embodiment of a method for enhancing IP2 index of a zero IF and low IF architecture receiver according to the present application;
FIG. 2 is a flow chart of another embodiment of a method for enhancing IP2 index of zero IF and low IF architecture receiver according to the present application;
FIG. 3 is a flow chart of another embodiment of a method for enhancing IP2 index of zero IF and low IF architecture receiver according to the present application;
FIG. 4 is a schematic diagram of the overall structure of an embodiment of the zero-IF or low-IF architecture of the present application;
fig. 5 is a schematic diagram of the overall structure of the device with a memory function of the present application.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Referring to fig. 1, fig. 1 is a flowchart illustrating an embodiment of a method for enhancing IP2 index of a zero intermediate frequency and low intermediate frequency architecture receiver according to the present application.
An embodiment of the present application provides a method for improving IP2 index of a receiver with zero intermediate frequency and low intermediate frequency architecture, including the following steps:
s101: a digital signal processing algorithm is used to detect the presence of an interfering signal outside the baseband.
In some cases, detecting the out-of-band interference signal using a digital signal processing algorithm (DSP) includes calculating out-of-band bin energy using the digital signal processing algorithm to obtain an out-of-band noise energy value and a received signal strength indicator value (RSSI), and in other cases, obtaining an updated received signal strength indicator value (updated RSSI).
The out-of-band noise energy value can be obtained by calculating the component of the interference signal outside the baseband through a Fast Fourier Transform (FFT) algorithm; the Received Signal Strength Indicator (RSSI) may be obtained by calculating the energy of the I/Q signal and logarithmically of the energy.
The present embodiment is a case one, analog direct communication, characterized by a simple and continuous interference signal.
The digital signal processing algorithm is only used for calculating the energy of the out-of-band frequency point of the baseband so as to obtain the out-of-band noise energy value and the received signal strength indication value (RSSI), the actual acting range of the interference signal is within the baseband (300 Hz-3 kHz), but when the interference signal in the baseband is strong (obvious noise or call interruption can be heard), the energy of the out-of-band signal is obviously enhanced, so that whether the interference signal in the baseband exists at the moment can be judged through the size of the out-of-band noise.
S102: and in response to the existence of the interference signal outside the baseband, judging whether the intensity of the interference signal outside the baseband is larger than a preset value.
In one embodiment, determining whether the strength of the interfering signal outside the baseband is greater than a predetermined value comprises:
s1021: whether a signal strength indication value (RSSI) is larger than a first preset value or not and whether an out-of-band noise energy value is larger than a second preset value or not are judged at preset time intervals.
Wherein the predetermined time is typically 2.5ms; the first preset value is-106 dBm to-100 dBm, such as-106 dBm, -104dBm, -103dBm or-100 dBm, etc., without limitation; the second preset value is 1500 to 1900, such as 1500, 1600, 1700, 1800, 1900, etc., without limitation.
Specifically, in one embodiment, it is determined whether the signal strength indicator value (RSSI) is greater than-103 dBm and the out-of-band noise energy value is greater than 1700 every 2.5 ms.
S1022: if the signal strength indication value (RSSI) is larger than the first preset value and the out-of-band noise energy value is larger than the second preset value, the strength of the interference signal outside the base band is larger than a preset value.
Wherein the first predetermined number of times is 90 to 150, such as 90, 110, 120, 135 or 150, etc., without limitation. The first predetermined number of times represents that in a period of continuous time, a signal strength indication value (RSSI) is larger than a first preset value, and an out-of-band noise energy value is larger than a second preset value, so that the strength of an interference signal outside the base band is larger than a predetermined value, and the first predetermined number of times can be determined after floating in a range through debugging according to actual conditions.
Specifically, in one embodiment, if the signal strength indicator (RSSI) is determined to be greater than-103 dBm and the out-of-band noise energy value is determined to be greater than 1700 for 120 consecutive times, i.e., the signal strength indicator (RSSI) is determined to be greater than-103 dBm every 2.5ms and the out-of-band noise energy value is determined to be greater than 1700 in 300 consecutive ms, the strength of the interference signal outside the baseband is greater than a predetermined value.
S103: and controlling the gain of the radio frequency front end to suppress the interference signal in response to the intensity of the interference signal outside the baseband being greater than a predetermined value.
And controlling the gain of the radio frequency front end to suppress the interference signal in response to the intensity of the interference signal outside the baseband being greater than a predetermined value, wherein the method specifically comprises the following steps: in response to the strength of the interfering signal outside the baseband being greater than a predetermined value, the attenuator is turned on to suppress the interfering signal. In other embodiments, controlling the gain of the radio frequency front end includes controlling the gain of a Low Noise Amplifier (LNA) of the radio frequency front end, in addition to the gain of the attenuator, and the like. The interference signals are distributed widely and exist inside and outside the baseband, so that the method judges that the intensity of the interference signals outside the baseband is larger than a preset value through a digital signal processing algorithm, the interference signals in the baseband are stronger at the moment, the gain of the front end of the radio frequency is controlled to inhibit the interference signals when the interference signals are stronger, and the sensitivity of a receiver architecture is not affected under the condition of normal no interference or small interference. Compared with the method for judging the intensity of the interference signal in the baseband by adopting a control means, the method is more accurate in judgment, can balance the sensitivity and the anti-interference capability of the receiver, has less energy consumption and low realization difficulty, does not need to increase hardware cost, and is easier to popularize and apply.
In one embodiment, if the attenuator includes at least a first stage attenuator and a second stage attenuator, turning on the attenuator includes:
s1031: and judging whether the first-stage attenuator is started or not.
S1032: and if the first-stage attenuator is not started, starting the first-stage attenuator.
S1033: if the first stage of attenuation is already on, judging whether the second stage of attenuator is on.
S1034: and if the second-stage attenuator is not started, starting the second-stage attenuator.
If the second stage attenuator is already on, the flow is ended.
If the two attenuators at the front end of the radio frequency are respectively a front attenuator relatively far away from the front attenuator and a rear attenuator relatively close to the front attenuator, the first-stage attenuator can be any one of the attenuators, and the second-stage attenuator is the other attenuator, which is not limited herein. In other embodiments, the attenuator may further include three or more attenuators, and the method may be adopted to turn on the attenuators sequentially, which is not described herein.
Referring to fig. 2, fig. 2 is a flowchart illustrating a method for enhancing IP2 index of a zero intermediate frequency and low intermediate frequency architecture receiver according to another embodiment of the present application.
Yet another embodiment of the present application provides a method for enhancing IP2 index of a zero intermediate frequency and low intermediate frequency architecture receiver, including the steps of:
s201: a digital signal processing algorithm is used to detect the presence of an interfering signal outside the baseband.
Detecting the interference signal outside the baseband using a digital signal processing algorithm (DSP) includes calculating baseband frequency point energy using the digital signal processing algorithm to obtain an out-of-band noise energy value and a received signal strength indicator value (RSSI), and also includes obtaining an updated received signal strength indicator value (updated RSSI).
The present embodiment is a case two, digital pass-through communication, characterized in that the interfering signal is discontinuous, slotted.
The method comprises the steps of calculating out-of-band frequency point energy (3 kHz-36 kHz) by a digital signal processing algorithm under a digital channel to obtain out-of-band noise energy value and a received signal strength indication value (RSSI), and obtaining an updated received signal strength indication value (UPdatedRSSI) to judge variables, so that the condition of communication interruption under strong interference can be judged.
Step S202: and in response to the existence of the interference signal outside the baseband, judging whether the intensity of the interference signal outside the baseband is larger than a preset value.
In yet another embodiment, determining whether the strength of the interfering signal outside the baseband is greater than a predetermined value includes two determination methods, either of which may be true:
the first method is as follows:
s2021: it is judged whether the updated received signal strength indication value (updated RSSI) is greater than a third preset value, whether the received signal strength indication value (RSSI) is less than a fourth preset value, and whether the out-of-band noise energy value is greater than a fifth preset value at predetermined intervals.
Wherein the predetermined time is typically 2.5ms; the third preset value is-113 dBm to-107 dBm, such as-113 dBm, -110dBm, or-107 dBm, etc., without limitation; the fourth preset value is-133 dBm to-127 dBm, such as-133 dBm, -130dBm, or-127 dBm, etc., without limitation; the fifth preset value is 550000 ～ 650000, for example 55000, 570000, 600000, 62000 or 650000, without limitation.
Specifically, in yet another embodiment, it is determined whether the received signal strength indicator value (UPdatedRSSI) is greater than-110 dBm, whether the received signal strength indicator value (RSSI) is less than-130 dBm, and whether the out-of-band noise energy value is greater than 600000, every 2.5 ms.
S2022: if the updated received signal strength indication value (updated RSSI) is greater than the third preset value, the received signal strength indication value (RSSI) is less than the fourth preset value, and the out-of-band noise energy value is greater than the fifth preset value, the strength of the interfering signal outside the baseband is greater than the predetermined value.
The second preset times are 7 times, the second preset times represent that in a continuous time, the signal strength indication value updating received signal strength indication value (UPdatedRSSI) is larger than a third preset value, the received signal strength indication value (RSSI) is smaller than a fourth preset value, and the out-of-band noise energy value is larger than a fifth preset value, so that the interference signal outside the baseband is larger than a preset value.
Specifically, in yet another embodiment, if the updated received signal strength indication value (UPdatedRSSI) is determined to be greater than-110 for 7 consecutive times, the received signal strength indication value (RSSI) is less than-130, and the out-of-band noise energy value is greater than 600000, i.e., the updated received signal strength indication value (UPdatedRSSI) is determined to be greater than-110 every 2.5ms within 17.5ms, the received signal strength indication value (RSSI) is less than-130, and the out-of-band noise energy value is greater than 600000, then the interfering signal outside the baseband is greater than a predetermined value.
The second method is as follows:
s2023: it is determined whether a received signal strength indication value (RSSI) is greater than a sixth preset value and whether an out-of-band noise energy value is less than a seventh preset value at predetermined intervals.
Wherein the predetermined time is typically 2.5ms; the sixth preset value is-106 dBm to-100 dBm, such as-106 dBm, -103dBm or-100 dBm, etc., without limitation; the seventh preset value is 118000 ～ 122000, for example 118000, 120000 or 122000, etc., without limitation.
Specifically, in yet another embodiment, it is determined whether the signal strength indicator value (RSSI) is less than-103 dBm and the out-of-band noise energy value is greater than 120000 every 2.5 ms.
S2024: if the third predetermined number of consecutive times determines that the Received Signal Strength Indicator (RSSI) is less than the sixth preset value and the out-of-band noise energy value is less than the seventh preset value, the strength of the interference signal outside the base band is greater than the predetermined value.
Wherein the third predetermined number of times is 170-230, such as 170, 190, 200 or 230, etc., without limitation. The third predetermined number of times represents that the signal strength indicator (RSSI) is less than a sixth preset value and the out-of-band noise energy value is less than a seventh preset value for a period of time, and the interference signal outside the base band is greater than a predetermined value.
Specifically, in yet another embodiment, if the strength indication value (RSSI) is determined to be less than-103 dBm and the out-of-band noise energy value is greater than 120000 for 200 consecutive times, i.e., the signal strength indication value (RSSI) is determined to be less than-103 dBm and the out-of-band noise energy value is greater than 120000 every 2.5ms within 500ms of the consecutive time, the interference signal outside the baseband is greater than the predetermined value.
S203: and controlling the gain of the radio frequency front end to suppress the interference signal in response to the intensity of the interference signal outside the baseband being greater than a predetermined value.
The content of step S203 is substantially the same as the corresponding steps in the above embodiment, and will not be repeated here.
Because the interference signals exist inside and outside the baseband, the method judges that the intensity of the interference signals outside the baseband is larger than a preset value through a digital signal processing algorithm, the interference signals in the baseband are stronger at the moment, the gain of the radio frequency front end is controlled to inhibit the interference signals when the interference signals are stronger, and the sensitivity of the receiver architecture is not affected under the condition of normal no interference or small interference. Compared with the method for judging the intensity of the interference signal in the baseband by adopting a control means, the method is more accurate in judgment, can balance the sensitivity and the anti-interference capability of the receiver, is less in energy consumption and low in implementation difficulty, does not need to increase hardware cost, and is easier to popularize and apply.
Referring to fig. 3, fig. 3 is a flowchart illustrating a method for enhancing IP2 index of a zero intermediate frequency and low intermediate frequency architecture receiver according to another embodiment of the present application.
Yet another embodiment of the present application provides a method for enhancing IP2 index of a zero intermediate frequency and low intermediate frequency architecture receiver, including the steps of:
s301: a digital signal processing algorithm is used to detect the presence of an interfering signal outside the baseband.
In some cases, detecting the out-of-band interference signal using a digital signal processing algorithm (DSP) includes calculating out-of-band bin energy using the digital signal processing algorithm to obtain an out-of-band noise energy value and a received signal strength indicator value (RSSI), and in other cases, obtaining an updated received signal strength indicator value (updated RSSI).
The present embodiment is case three, digital trunking and transit communications, characterized by the fact that the interfering signal is continuous and non-slotted.
The digital trunking and the transit communication mode have signals in a plurality of time slots, and the situation only needs to calculate the energy of the base out-of-band frequency point by utilizing a digital signal processing algorithm to obtain an out-of-band noise energy value and a received signal strength indication value (RSSI), so as to judge whether an interference signal exists at the moment according to the two values.
S302: and in response to the existence of the interference signal outside the baseband, judging whether the intensity of the interference signal outside the baseband is larger than a preset value.
In one embodiment, determining whether the strength of the interfering signal outside the baseband is greater than a predetermined value comprises:
s3021: it is determined whether a received signal strength indication value (RSSI) is greater than an eighth preset value and whether an out-of-band noise energy value is greater than a ninth preset value at predetermined intervals.
Wherein the predetermined time is typically 2.5ms; the eighth preset value is-92 dBm to-86 dBm, such as-92 dBm, -89dBm or-86 dBm, etc., without limitation; the ninth preset value is 9200 to 9800, for example 9200, 9500, 9800, etc., and is not limited herein.
Specifically, in yet another embodiment, it is determined whether the signal strength indicator value (RSSI) is greater than-89 dBm and the out-of-band noise energy value is greater than 9500 every 2.5 ms.
S3022: if the Received Signal Strength Indication (RSSI) value is greater than the eighth preset value and the out-of-band noise energy value is greater than the ninth preset value, the first counter counts up to a fourth preset number of times.
The fourth predetermined number of times is typically 20, specifically, if the Received Signal Strength Indicator (RSSI) is determined to be greater than-89 dBm and the out-of-band noise energy value is greater than 9500, the first counter counts up to 20.
S3023: if the received signal strength indication value (RSSI) is judged to be larger than the eighth preset value, the out-of-band noise energy value is smaller than the ninth preset value, and the number of times of the first counter is larger than zero, the count of the first counter is reduced once.
If the received signal strength indication value (RSSI) is judged to be larger than an eighth preset value, the out-of-band noise energy value is smaller than the ninth preset value, and the number of times of the first counter is larger than zero, the count of the first counter is reduced once, otherwise, the number of times of the first counter is cleared.
Specifically, if the Received Signal Strength Indicator (RSSI) is determined to be greater than-89 dBm and the out-of-band noise energy value is less than or equal to 9500 and the number of times of the first counter is greater than zero, the first counter count is decremented by one time.
S303: it is determined whether the count of the first counter is greater than zero.
Step S303 is performed after step 3022 and step S3023.
S3031: if the count of the first counter is still greater than zero, the count of the second counter is increased once.
If the count of the first counter is still greater than zero, the count of the second counter is increased once, otherwise, the count of the second counter is cleared.
S304: it is determined whether the count of the second counter is greater than a fifth predetermined number of times.
S3041: if the count of the second counter is larger than the fifth preset number of times, the interference signal outside the baseband is larger than the preset value.
And if the count of the second counter is larger than the fifth preset number of times, the interference signal outside the baseband is larger than a preset value, otherwise, the interference signal outside the baseband is below the preset value.
Wherein the fifth predetermined number of times is 170 to 230, such as 170, 200, 230, etc., without limitation. Specifically, if the count of the second counter is greater than 200 times, the interference signal outside the baseband is determined to be greater than a predetermined value.
The data is collected through experiments, and the out-of-band noise is not judged to be larger than the eighth preset value at intervals of preset time when the interference exists, and the out-of-band noise energy value is larger than the ninth preset value, so that the interference is considered when the judgment condition is adjusted to exist in a period of time when the signal strength indication (RSSI) and the data with larger out-of-band noise exist. The present embodiment essentially uses the first counter to count the out-of-band noise energy value greater than the ninth preset value.
In one embodiment, when the signal strength indicator (RSSI) is greater than the eighth preset value and the out-of-band noise energy value is greater than 9500 in the last 20 2.5ms, the first counter is positive, and when the consecutive 200 2.5ms first counters are positive, the interference signal outside the base band is considered to be greater than the predetermined value.
S305: and controlling the gain of the radio frequency front end to suppress the interference signal in response to the intensity of the interference signal outside the baseband being greater than a predetermined value.
The content of step S305 is substantially the same as the corresponding steps in the above embodiment, and will not be repeated here.
The interference signals are distributed widely and exist inside and outside the baseband, so that the method judges that the intensity of the interference signals outside the baseband is larger than a preset value through a digital signal processing algorithm, the interference signals in the baseband are stronger at the moment, namely, the control of the gain of the radio frequency front end is adopted to inhibit the interference signals when the interference signals are stronger, and the sensitivity of the receiver architecture is not affected under the condition of normal no interference or small interference. Compared with the method for judging the intensity of the interference signal in the baseband by adopting a control means, the method is more accurate in judgment, can balance the sensitivity and the anti-interference capability of the receiver, is less in energy consumption and low in implementation difficulty, does not need to increase hardware cost, and is easier to popularize and apply.
Referring to fig. 4, fig. 4 is a schematic overall structure of an embodiment of the zero intermediate frequency or low intermediate frequency architecture of the present application.
Yet another embodiment of the present application provides a zero intermediate frequency or low intermediate frequency architecture 40 comprising a radio frequency low pass filter 41, a low noise amplifier 42, a band pass filter 43, an attenuator 44, a radio frequency integrated circuit 45 and a digital signal processing chip 46. At least one attenuator 44 is disposed between the rf low-pass filter 41 and the rf integrated circuit 45, and a Digital Signal Processing (DSP) chip 46 controls the gain of the low-noise amplifier 42 and/or the attenuator 44 by detecting an interference signal outside the baseband to suppress the interference signal. The digital signal processing chip 46 judges that the intensity of the interference signal outside the baseband is larger than a preset value, namely, when the interference signal is strong, the gain of the radio frequency front end is controlled to inhibit the interference signal, and the sensitivity of the receiver architecture is not affected under the condition of normal no interference or small interference.
Further, the attenuator 44 includes a front attenuator located between the radio frequency low pass filter 41 and the low noise amplifier 42 and a rear attenuator located between the band pass filter 43 and the radio frequency integrated circuit 45. The front attenuator and the rear attenuator can be selectively opened either or both according to actual conditions.
The zero intermediate frequency or low intermediate frequency architecture 40 of the present application can implement any of the methods of enhancing the IP2 index of the zero intermediate frequency and low intermediate frequency architecture receiver in the above embodiments, and will not be described herein.
Referring to fig. 5, fig. 5 is a schematic overall structure of a device with a storage function according to the present application.
A further embodiment of the present application provides an apparatus 50 with a storage function, where the apparatus 50 stores program data 51, and the program data 51 can be executed to implement the method for enhancing IP2 index of the zero intermediate frequency and low intermediate frequency architecture receiver in any of the above embodiments. I.e. the above-described method of raising the IP2 index of the zero intermediate frequency and low intermediate frequency architecture receiver is implemented in software and sold or used as a separate product, it can be stored in a device 50 with a storage function readable by an electronic apparatus. The device 50 having a storage function may be a usb disk, an optical disk, or a server.
The foregoing description is only exemplary embodiments of the present application and is not intended to limit the scope of the present application, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present application, or direct or indirect application in other related technical fields are included in the scope of the present application.
Claims (4)
1. A method for boosting IP2 metrics for a zero intermediate frequency and low intermediate frequency architecture receiver, comprising:
detecting whether an interference signal outside a baseband exists or not by using a digital signal processing algorithm;
responding to the existence of an interference signal outside the baseband, and judging whether the intensity of the interference signal outside the baseband is larger than a preset value;
controlling the gain of the radio frequency front end to suppress the interference signal in response to the intensity of the interference signal outside the base band being greater than a predetermined value;
the detecting the interference signal outside the baseband by using the digital signal processing algorithm comprises:
calculating the energy of the baseband outer frequency point by using a digital signal processing algorithm to obtain an out-of-band noise energy value and a received signal strength indication value;
the determining whether the strength of the interference signal outside the base band is greater than a predetermined value includes:
judging whether the signal strength indication value is larger than a first preset value or not at intervals of preset time, and judging whether the out-of-band noise energy value is larger than a second preset value or not;
if the signal strength indication value is judged to be larger than the first preset value continuously for a first preset number of times, and the out-of-band noise energy value is judged to be larger than the second preset value continuously;
the strength of the interfering signal outside the baseband is greater than the predetermined value;
or,
the detecting the interference signal outside the baseband by using the digital signal processing algorithm comprises:
calculating the energy of the baseband outer frequency point by using a digital signal processing algorithm to obtain an out-of-band noise energy value and a received signal strength indication value;
the determining whether the strength of the interference signal outside the base band is greater than a predetermined value includes:
judging whether the received signal strength indication value is larger than an eighth preset value or not at intervals of preset time, and judging whether the out-of-band noise energy value is larger than a ninth preset value or not;
if the received signal strength indication value is judged to be larger than an eighth preset value and the out-of-band noise energy value is judged to be larger than a ninth preset value, the first counter is increased to a fourth preset number of times, and the second counter is increased once;
if the received signal strength indication value is judged to be larger than an eighth preset value, the out-of-band noise energy value is smaller than a ninth preset value, the number of times of the first counter is larger than zero, the count of the first counter is reduced once, and if the count of the first counter is still larger than zero, the count of the second counter is increased once;
if the count of the second counter is greater than a fifth preset number of times, the interference signal outside the base band is greater than the preset value;
or,
the detecting the interference signal outside the baseband by using the digital signal processing algorithm comprises:
the digital signal processing algorithm is utilized to acquire and update a received signal strength indication value, an out-of-band noise energy value and a received signal strength indication value;
the determining whether the strength of the interference signal outside the base band is greater than a predetermined value includes:
judging whether the updated received signal strength indication value is larger than a third preset value or not at preset time intervals, whether the received signal strength indication value is smaller than a fourth preset value or not, and whether the out-of-band noise energy value is larger than a fifth preset value or not;
if the updated received signal strength indication value is judged to be greater than a third preset value continuously for a second preset number of times, the received signal strength indication value is smaller than the fourth preset value, and the out-of-band noise energy value is greater than the fifth preset value, the interference signal outside the base band is greater than the preset value; or,
judging whether the received signal strength indication value is smaller than a sixth preset value or not at intervals of preset time, and judging whether the out-of-band noise energy value is smaller than a seventh preset value or not;
if the received signal strength indication value is judged to be smaller than the sixth preset value continuously for a third preset time, and the out-of-band noise energy value is less than the seventh preset value;
the strength of the interfering signal outside the baseband is greater than the predetermined value.
2. The method of claim 1, wherein controlling the gain of the radio frequency front end to suppress the interfering signal in response to the strength of the interfering signal outside the baseband being greater than a predetermined value comprises:
and in response to the interference signal outside the base band being greater than a predetermined value, turning on an attenuator to suppress the interference signal.
3. The method of claim 2, wherein if the attenuators include at least a first stage attenuator and a second stage attenuator, the turning on the attenuators comprises:
judging whether the first-stage attenuator is started or not;
if the first-stage attenuator is not started, starting the first-stage attenuator;
if the first-stage attenuator is already started, judging whether the second-stage attenuator is started or not;
and if the second-stage attenuator is not started, starting the second-stage attenuator.
4. A zero intermediate frequency or low intermediate frequency architecture comprising a radio frequency low pass filter, a low noise amplifier, a band pass filter, an attenuator, a radio frequency integrated circuit and a digital signal processing chip, wherein at least one of the attenuators is arranged between the radio frequency low pass filter and the radio frequency integrated circuit, the digital signal processing chip detects an interfering signal outside the baseband by the method of any one of claims 1-3, and controls the gain of the low noise amplifier and/or the attenuators to suppress the interfering signal.
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| CN115333655B (en) * | 2022-10-10 | 2024-03-26 | 华安中云股份有限公司 | Method and device for automatically detecting interference, knapsack base station and storage medium |
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| WO2007008314A2 (en) * | 2005-07-06 | 2007-01-18 | Motorola, Inc. | Rf receiver, wireless communication terminal and method of operation |
| WO2009099786A2 (en) * | 2008-02-01 | 2009-08-13 | Motorola, Inc. | Receiver and method of operation for use in mobile communications |
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| US7203471B2 (en) * | 2002-12-30 | 2007-04-10 | Motorola, Inc. | System and method for selectively utilizing an attenuation device in a two-way radio receiver based on squelch detect and radio signal strength indication (RSSI) |
| US7664211B2 (en) * | 2005-10-07 | 2010-02-16 | Starkey Laboratories, Inc. | Automatic gain control with out of band blocking signal compensation |
| US8515372B2 (en) * | 2008-03-24 | 2013-08-20 | Freescale Semiconductor, Inc. | Receiver configurable in a plurality of modes |
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| WO2007008314A2 (en) * | 2005-07-06 | 2007-01-18 | Motorola, Inc. | Rf receiver, wireless communication terminal and method of operation |
| WO2009099786A2 (en) * | 2008-02-01 | 2009-08-13 | Motorola, Inc. | Receiver and method of operation for use in mobile communications |
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