CN113497633A - 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
- Publication number
- CN113497633A CN113497633A CN202010251455.6A CN202010251455A CN113497633A CN 113497633 A CN113497633 A CN 113497633A CN 202010251455 A CN202010251455 A CN 202010251455A CN 113497633 A CN113497633 A CN 113497633A
- Authority
- CN
- China
- Prior art keywords
- value
- baseband
- preset
- preset value
- interference signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
Abstract
The application discloses a method for improving IP2 indexes of a zero intermediate frequency and low intermediate frequency architecture receiver and an architecture thereof, wherein the method for improving the IP2 indexes of the zero intermediate frequency and low intermediate frequency architecture receiver comprises the following steps: detecting whether an interference signal outside a baseband exists by using a digital signal processing algorithm; responding to the interference signal existing outside the baseband, and judging whether the intensity of the interference signal outside the baseband is greater than a preset value or not; and 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. The strength of the interference signal outside the baseband is judged to be larger than a preset value through a digital signal processing algorithm, namely, when the interference signal is stronger, the gain of the radio frequency front end is controlled to inhibit the interference signal, and the sensitivity of a receiver framework cannot be influenced under the condition of normal interference or small interference. Moreover, 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 architectures, and particularly relates to a method for improving IP2 indexes of receivers with zero intermediate frequency and low intermediate frequency architectures and an architecture thereof.
Background
In modern receivers, the zero-if and low-if architectures have many advantages, such as high integration, low cost, and simpler circuit structure. Even so, it still presents some serious problems. Among them, poor interference rejection is a big factor that hinders large-scale application of such architecture receivers. The external interference is classified into single tone interference (causing Blocking problem) and multi-tone interference (causing problems of IP2, IP3, etc.). The most serious of these problems is due to the two tone interference, which generates low frequency interference signals at baseband due to the zero if and the inherent structure of the low if receiver.
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 seriously affect the communication quality when a useful signal is weak.
Disclosure of Invention
The application provides a method for improving IP2 indexes of a receiver with a zero intermediate frequency and low intermediate frequency architecture and an architecture thereof, so as to solve the technical problem that the sensitivity of a system is influenced by directly adding and opening an attenuator in the architecture.
In order to solve the technical problem, the application adopts a technical scheme that: a method for improving IP2 indexes of a zero intermediate frequency and low intermediate frequency architecture receiver comprises the following steps: detecting whether an interference signal outside a baseband exists by using a digital signal processing algorithm; responding to the interference signal existing outside the baseband, and judging whether the interference signal outside the baseband is larger than a preset value or not; and controlling the gain of the radio frequency front end to suppress the interference signal when the intensity of the interference signal outside the baseband is larger than a preset value.
According to an embodiment of the present application, the detecting the interference signal outside the baseband by using the digital signal processing algorithm includes: and calculating the energy of the baseband frequency points by using a digital signal processing algorithm to obtain an out-of-band noise energy value and a received signal strength indicating 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 indicated value is greater than a first preset value or not and whether the out-of-band noise energy value is greater than a second preset value or not every preset time; if the signal strength indicating value is larger than the first preset value and the out-of-band noise energy value is larger than the second preset value, judging that the signal strength indicating value is larger than the first preset value for a first preset number of times; 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 by using the digital signal processing algorithm includes: an updated received signal strength indicator value, an out-of-band noise energy value, and a received signal strength indicator 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 indicating value is larger than a third preset value, whether the received signal strength indicating value is smaller than a fourth preset value and whether the out-of-band noise energy value is larger than a fifth preset value at intervals of preset time; if the updated received signal strength indicating value is larger than a third preset value, the received signal strength indicating value is smaller than a seventh preset value and the out-of-band noise energy value is larger than a fifth preset value after continuous second preset times, the interference signal out of the baseband is larger than the preset value; or, judging whether the received signal strength indicated value is smaller than a sixth preset value or not and whether the out-of-band noise energy value is smaller than a seventh preset value or not at intervals of preset time; if the received signal strength indicating value is smaller than the sixth preset value and the out-of-band noise energy value is smaller than the seventh preset value, judging that the received signal strength indicating value is smaller than the sixth preset value for a third preset number of times; 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 indicating value is greater than an eighth preset value or not and whether the out-of-band noise energy value is greater than a ninth preset value or not at intervals of preset time; if the received signal strength indicating 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 count of the first counter is increased to a fourth preset number of times, and the count of the second counter is increased once; if the received signal strength indicating value is larger than an eighth preset value, the out-of-band noise energy value is smaller than a 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, 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 greater than a fifth preset number of times, the intensity of the interference signal outside the baseband is greater than the preset value.
According to an embodiment of the present application, the controlling the gain of the rf 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 strength of the interference signal outside the baseband 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 at least includes a first-stage attenuator and a second-stage attenuator, the turning-on attenuator includes: judging whether the first-stage attenuator is turned on or not; if the first-stage attenuator is not started, the first-stage attenuator is started; if the first-stage attenuator is already turned on, judging whether the second-stage attenuator is turned on; and if the second-stage attenuator is not turned on, turning on the second-stage attenuator.
In order to solve the above technical problem, another technical solution adopted by the present application is: a 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 suppress the interference signal.
In order to solve the above technical problem, another technical solution adopted by the present application is: an apparatus having a storage function, the apparatus storing program data executable to implement a method as claimed in any one of the preceding claims.
The beneficial effect of this application is: 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 baseband, the interference signal outside the baseband is judged through a digital signal processing algorithm, whether the interference signal exists in the baseband or not 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 a receiver framework cannot be influenced under the condition of normal interference or small interference. Compared with the method that the control means is adopted by judging the strength of the interference signal in the band base, the method has the advantages that the judgment is more accurate, the sensitivity and the anti-interference capability of the receiver can be balanced, the energy consumption is low, the realization difficulty is low, the hardware cost is not increased, and the popularization and the application are easier.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
fig. 1 is a flowchart illustrating an embodiment of a method for raising an IP2 index of a zero-if and low-if architecture receiver according to the present application;
fig. 2 is a schematic flow chart diagram illustrating a method for raising the IP2 index of a zero-if and low-if architecture receiver according to another embodiment of the present application;
fig. 3 is a schematic flow chart diagram illustrating a method for raising the IP2 index of a zero-if and low-if architecture receiver according to another embodiment of the present application;
FIG. 4 is a schematic diagram of an overall structure of an embodiment of a 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 storage function according to the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a flowchart illustrating an embodiment of a method for improving IP2 index of a zero-if and low-if architecture receiver according to the present disclosure.
An embodiment of the present application provides a method for improving IP2 indexes of a zero-if and low-if architecture receiver, including the following steps:
s101: and detecting whether the interference signal outside the baseband exists by using a digital signal processing algorithm.
In some cases, detecting the interfering signal out of baseband using a digital signal processing algorithm (DSP) includes calculating out-of-baseband frequency bin energy using a 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 (updatedlrssi).
The out-of-band noise energy value can be obtained by calculating components of the interference signal outside a baseband through a Fast Fourier Transform (FFT) algorithm; the Received Signal Strength Indicator (RSSI) value may be obtained by calculating the energy of the I/Q signal and logarithmically computing the energy.
The embodiment is a case one, analog direct communication, and is characterized in that the interference signal is simple and continuous.
In the situation, the energy of the out-of-band frequency point is calculated only by utilizing a digital signal processing algorithm to obtain the out-of-band noise energy value and a received signal strength indication value (RSSI), the actual action range of the interference signal is in the baseband (300Hz-3kHz), but when the interference signal in the baseband is strong (obvious noise can be heard or the call is interrupted), the energy of the out-of-band signal is obviously enhanced, so that whether the interference signal in the baseband exists or not can be judged according to the magnitude of the out-of-band noise.
S102: and responding to the existence of the interference signal outside the baseband, and judging whether the strength of the interference signal outside the baseband is greater than a preset value.
In one embodiment, determining whether the strength of the interference signal outside the baseband is greater than a predetermined value comprises:
s1021: and judging whether a signal strength indication value (RSSI) is greater than a first preset value or not and whether an out-of-band noise value and an out-of-band noise energy value are greater than a second preset value or not at preset intervals.
Wherein the predetermined time is typically 2.5 ms; the first preset value is-106 dBm to-100 dBm, such as-106 dBm, -104dBm, -103dBm or-100 dBm, etc., which is not limited herein; the second predetermined value is 1500-1900, such as 1500, 1600, 1700, 1800, or 1900, and the like, which is not limited herein.
Specifically, in one embodiment, a determination is made every 2.5ms as to whether the signal strength indicator (RSSI) value is greater than-103 dBm and the out-of-band noise energy value is greater than 1700.
S1022: if the signal strength indication value (RSSI) is judged to be larger than the first preset value for the first preset times continuously, and the out-of-band noise energy value is larger than the second preset value, the strength of the interference signal outside the baseband is larger than the preset value.
The first predetermined number is 90-150, such as 90, 110, 120, 135 or 150, and the like, which is not limited herein. The first preset times represent that a signal strength indication value (RSSI) is larger than a first preset value within a period of continuous time, and an out-of-band noise energy value is larger than a second preset value, so that the strength of an interference signal outside a baseband is larger than a preset value, and the first preset times can be determined after the interference signal floats in a range through debugging according to actual conditions.
Specifically, in an embodiment, if the signal strength indicator (RSSI) value is greater than-103 dBm and the out-of-band noise energy value is greater than 1700 for 120 consecutive times, that is, the RSSI value is greater than-103 dBm every 2.5ms and the out-of-band noise energy value is greater than 1700 within 300ms, the strength of the interference signal outside the baseband is greater than the predetermined value.
S103: and 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.
In response to the strength of the interference signal outside the baseband being greater than the predetermined value, controlling the gain of the radio frequency front end to suppress the interference signal specifically includes: and in response to the strength of the interference signal outside the baseband being greater than a predetermined value, turning on an attenuator to suppress the interference 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 controlling the gain of the attenuator. 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 greater 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 a receiver framework cannot be influenced under the condition of normal interference or small interference. Compared with the method that the control means is adopted by judging the strength of the interference signal in the baseband, the method has the advantages of more accurate judgment, capability of balancing the sensitivity and the anti-interference capability of the receiver, less energy consumption, low implementation difficulty, no need of increasing hardware cost and easiness in popularization and application.
In one embodiment, if the attenuator comprises at least a first stage attenuator and a second stage attenuator, turning on the attenuator comprises:
s1031: and judging whether the first-stage attenuator is turned on or not.
S1032: and if the first-stage attenuator is not started, starting the first-stage attenuator.
S1033: and if the first-stage attenuator is already turned on, judging whether the second-stage attenuator is turned on.
S1034: and if the second-stage attenuator is not turned on, turning on the second-stage attenuator.
And if the second-stage attenuator is already turned on, ending the process.
If the number of the attenuators at the front end of the radio frequency is two, namely, a front attenuator relatively far away from the front end and a rear attenuator relatively close to the front end, the first-stage attenuator may be any one of the attenuators, and the second-stage attenuator may be another attenuator, which is not limited herein. In other embodiments, the attenuator may further include three or more attenuators, and the attenuators may be sequentially turned on by using the method described above, which is not described herein again.
Referring to fig. 2, fig. 2 is a flowchart illustrating a method for raising the IP2 index of the zero-if and low-if architecture receiver according to another embodiment of the present application.
Another embodiment of the present application provides a method for improving IP2 indexes of a zero-if and low-if architecture receiver, including the following steps:
s201: and detecting whether the interference signal outside the baseband exists by using a digital signal processing algorithm.
Detecting the out-of-band interferer using a digital signal processing algorithm (DSP) includes calculating out-of-band frequency 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 also includes obtaining an updated received signal strength indicator value (updatedlsi).
The present embodiment is case two, digital direct communication, and is characterized in that the interference signal is discontinuous and time-slotted.
Under the digital channel, besides calculating out-of-band frequency point energy (3kHz-36kHz) by using a digital signal processing algorithm to obtain out-of-band noise energy value and a received signal strength indication value (RSSI), the method also comprises the step of obtaining an updated received signal strength indication value (UPdated RSSI) to judge variables, so that the condition of communication interruption under strong interference can be judged.
Step S202: and responding to the existence of the interference signal outside the baseband, and judging whether the strength of the interference signal outside the baseband is greater than a preset value.
In another embodiment, the determining whether the strength of the interference signal outside the baseband is greater than the predetermined value includes two determination methods, and any one of the determination methods is satisfied:
the first method comprises the following steps:
s2021: and judging whether an updated received signal strength indication value (UPdated RSSI) is greater than a third preset value, whether a received signal strength indication value (RSSI) is smaller than a fourth preset value and whether an out-of-band noise energy value is greater than a fifth preset value at intervals of preset time.
Wherein the predetermined time is typically 2.5 ms; the third preset value is-113 dBm to-107 dBm, such as-113 dBm, -110dBm, or-107 dBm, etc., which is not limited herein; the fourth preset value is-133 dBm to-127 dBm, such as-133 dBm, -130dBm, or-127 dBm, and the like, which is not limited herein; the fifth predetermined value is 550000 to 650000, such as 550000, 570000, 600000, 620000, or 650000, which is not limited herein.
Specifically, in yet another embodiment, it is determined every 2.5ms whether the updated received signal strength indicator value (updatedlsi) 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.
S2022: and if the updated received signal strength indication value (UPdated RSSI) is judged to be larger than the third preset value, the received signal strength indication value (RSSI) is smaller than the fourth preset value and the out-of-band noise energy value is larger than the fifth preset value for the second preset times, the strength of the interference signal outside the baseband is larger than the preset value.
The second predetermined number of times is 7, where the second predetermined number of times represents that, within a period of continuous time, the updated received signal strength indicator value (updatedlsi) of the RSSI is greater than the third preset value, the received signal strength indicator value (RSSI) is less than the fourth preset value, and the out-of-band noise energy value is greater than the fifth preset value, then the out-of-band interference signal is greater than the predetermined value.
Specifically, in yet another embodiment, if the updated received signal strength indicator value (updatedlrssi) is determined to be greater than-110, the received signal strength indicator value (RSSI) is less than-130, and the out-of-band noise energy value is greater than 600000 for 7 consecutive times, i.e., within 17.5ms, the updated received signal strength indicator value (updatedlrssi) is determined to be greater than-110 every 2.5ms, the received signal strength indicator 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 the predetermined value.
The second method comprises the following steps:
s2023: and judging whether the received signal strength indication value (RSSI) is greater than a sixth preset value or not and whether the out-of-band noise energy value is less than a seventh preset value or not at intervals of preset time.
Wherein the predetermined time is typically 2.5 ms; the sixth preset value is-106 dBm to-100 dBm, such as-106 dBm, -103dBm or-100 dBm, and the like, and the limitation is not made herein; the seventh preset value is 118000 to 122000, such as 118000, 120000, or 122000, and the like, which is not limited herein.
Specifically, in yet another embodiment, a determination is made every 2.5ms as to whether the signal strength indicator value (RSSI) is less than-103 dBm and the out-of-band noise energy value is greater than 120000.
S2024: and if the received signal strength indication value (RSSI) is judged to be smaller than the sixth preset value and the out-of-band noise energy value is smaller than the seventh preset value for the third preset times, the strength of the interference signal outside the baseband is larger than the preset value.
The third predetermined number is 170-230, such as 170, 190, 200, or 230, and the like, which is not limited herein. The third predetermined number of times represents that a signal strength indicator (RSSI) value is smaller than a sixth preset value and an out-of-band noise energy value is smaller than a seventh preset value within a period of time, and then an interference signal outside the baseband is larger than a predetermined value.
Specifically, in yet another embodiment, if the strength indicator (RSSI) value is less than-103 dBm and the out-of-band noise energy value is greater than 120000 for 200 consecutive times, i.e., the RSSI value is less than-103 dBm and the out-of-band noise energy value is greater than 120000 every 2.5ms for 500 consecutive ms, the interfering 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 strength 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 embodiments, and is not described herein again.
Because the interference signal exists inside and outside the baseband, the method judges that the intensity of the interference signal outside the baseband is greater than a preset value through a digital signal processing algorithm, the interference signal in the baseband is stronger at the moment, and the method controls the gain of the radio frequency front end to inhibit the interference signal when the interference signal is stronger, so that the sensitivity of a receiver framework cannot be influenced under the condition of normal interference or small interference. Compared with the method that the control means is adopted by judging the strength of the interference signal in the baseband, the method has the advantages of more accurate judgment, capability of balancing the sensitivity and the anti-interference capability of the receiver, less energy consumption, low implementation difficulty, no need of increasing hardware cost and easiness in popularization and application.
Referring to fig. 3, fig. 3 is a flowchart illustrating a method for raising the IP2 index of the zero-if and low-if architecture receiver according to another embodiment of the present application.
Another embodiment of the present application provides a method for improving IP2 indexes of a zero-if and low-if architecture receiver, including the following steps:
s301: and detecting whether the interference signal outside the baseband exists by using a digital signal processing algorithm.
In some cases, detecting the interfering signal out of baseband using a digital signal processing algorithm (DSP) includes calculating out-of-baseband frequency bin energy using a 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 (updatedlrssi).
The embodiment is case three, digital trunking and relay communication, and is characterized in that the interference signal is continuous and not time-slotted.
In the digital cluster and the transit communication mode, signals exist in a plurality of time slots, and in the situation, the energy of the baseband frequency point is calculated by using a digital signal processing algorithm to obtain an out-of-band noise energy value and a received signal strength indication value (RSSI), so that whether an interference signal exists at the moment is judged according to the out-of-band noise energy value and the RSSI.
S302: and responding to the existence of the interference signal outside the baseband, and judging whether the strength of the interference signal outside the baseband is greater than a preset value.
In one embodiment, determining whether the strength of the interference signal outside the baseband is greater than a predetermined value comprises:
s3021: and judging whether the received signal strength indication value (RSSI) is greater than an eighth preset value or not and whether the out-of-band noise energy value is greater than a ninth preset value or not at intervals of preset time.
Wherein the predetermined time is typically 2.5 ms; the eighth preset value is-92 dBm to-86 dBm, such as-92 dBm, -89dBm or-86 dBm, and the like, and the limitation is not made herein; the ninth default value is 9200 to 9800, such as 9200, 9500, 9800, and the like, and is not limited herein.
Specifically, in yet another embodiment, a determination is made every 2.5ms as to whether the signal strength indicator value (RSSI) is greater than-89 dBm and the out-of-band noise energy value is greater than 9500.
S3022: and if the received signal strength indication value (RSSI) is judged to be larger than the eighth preset value and the out-of-band noise energy value is judged to be larger than the ninth preset value, the first counter counts and increases to a fourth preset number of times.
The fourth predetermined number of times is usually 20, and specifically, if the Received Signal Strength Indicator (RSSI) value is determined to be greater than-89 dBm and the out-of-band noise energy value is determined to be greater than 9500, the first counter is incremented to 20.
S3023: and 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 below 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.
And 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 below the ninth preset value, and the frequency of the first counter is larger than zero, the count of the first counter is reduced once, otherwise, the frequency of the first counter is reset.
Specifically, if the Received Signal Strength Indication (RSSI) value is determined to be greater than-89 dBm, 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 decreased once.
S303: and judging whether the count of the first counter is larger than zero.
After step 3022 and step S3023, the process proceeds to step S303.
S3031: 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 first counter is still larger than zero, the count of the second counter is increased once, otherwise, the count of the second counter is cleared.
S304: and judging whether the count of the second counter is greater than a fifth preset number.
S3041: and if the count of the second counter is greater than a fifth preset number of times, the interference signal outside the baseband is greater than a preset value.
And if the count of the second counter is greater than a fifth preset number of times, the interference signal outside the baseband is greater than a preset value, otherwise, the interference signal outside the baseband is below the preset value.
The fifth predetermined number is 170 to 230, such as 170, 200, or 230, and the like, which is not limited herein. Specifically, if the count of the second counter is greater than 200 times, it is determined that the interference signal outside the baseband is greater than the predetermined value.
The data acquisition through experiments shows that the received signal strength indicator value (RSSI) is not judged to be larger than the eighth preset value every preset time and the out-of-band noise energy value is larger than the ninth preset value when the interference exists, so that the interference is considered to exist when the judgment condition is adjusted to be that the data with the larger signal strength indicator value (RSSI) and the larger out-of-band noise exist in a period of time. The embodiment substantially utilizes the first counter to count the out-of-band noise energy value greater than the ninth preset value.
For example, in a specific embodiment, when the signal strength indicator (RSSI) value is greater than the eighth preset value and the out-of-band noise energy value of the last 20 2.5ms memories is greater than 9500, the first counter is a positive number, and when 200 consecutive 2.5ms first counters are positive numbers, the out-of-baseband interference signal is considered to be greater than the preset value.
S305: and 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.
The content of step S305 is substantially the same as the corresponding steps in the above embodiments, and is not described herein again.
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 greater than a preset value through a digital signal processing algorithm, the interference signals in the baseband are stronger at the moment, namely 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 a receiver framework cannot be influenced under the condition of normal interference or small interference. Compared with the method that the control means is adopted by judging the strength of the interference signal in the baseband, the method has the advantages of more accurate judgment, capability of balancing the sensitivity and the anti-interference capability of the receiver, less energy consumption, low implementation difficulty, no need of increasing hardware cost and easiness in popularization and application.
Referring to fig. 4, fig. 4 is a schematic diagram of an overall structure of an embodiment of a zero-if or low-if architecture according to the present application.
Yet another embodiment of the present application provides a zero-if or low-if architecture 40, which includes 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 gains of the low noise amplifier 42 and/or the attenuator 44 by detecting an interference signal outside a baseband to suppress the interference signal. The strength of the interference signal outside the baseband is judged to be greater than the predetermined value by the digital signal processing chip 46, that is, the rf front-end gain is controlled to suppress the interference signal when the interference signal is strong, and the sensitivity of the receiver architecture is not affected under the condition of normal interference or small interference.
Further, the attenuator 44 includes a front attenuator positioned between the radio frequency low pass filter 41 and the low noise amplifier 42 and a rear attenuator positioned between the band pass filter 43 and the radio frequency integrated circuit 45. The front attenuator and the rear attenuator can be selectively turned on or turned on completely according to actual conditions.
The zero-if or low-if architecture 40 of the present application can implement any method for improving the IP2 index of the zero-if and low-if architecture receiver in the above embodiments, which is not described herein again.
Referring to fig. 5, fig. 5 is a schematic diagram of an overall structure of the device with a storage function according to the present application.
Yet another embodiment of the present application provides an apparatus 50 having a storage function, where the apparatus 50 stores program data 51, and the program data 51 can be executed to implement the method for raising the IP2 index of the zero-if and low-if architecture receiver according to any of the above embodiments. That is, the method for improving the IP2 index of the zero-if and low-if architecture receiver is implemented in software and sold or used as a stand-alone product, and can be stored in a device 50 with a storage function, which can be read by an electronic device. The device 50 with storage function may be a usb-disk, an optical disk, or a server.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings, or which are directly or indirectly applied to other related technical fields, are intended to be included within the scope of the present application.
Claims (10)
1. A method for improving IP2 indexes of a zero intermediate frequency and low intermediate frequency architecture receiver is characterized by comprising the following steps:
detecting whether an interference signal outside a baseband exists by using a digital signal processing algorithm;
responding to the interference signal existing outside the baseband, and judging whether the intensity of the interference signal outside the baseband is greater than a preset value or not;
and 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.
2. The method of claim 1, wherein the detecting the interfering signal outside the baseband using a digital signal processing algorithm comprises:
and calculating the energy of the baseband frequency points by using a digital signal processing algorithm to obtain an out-of-band noise energy value and a received signal strength indicating value.
3. The method of claim 2, wherein the determining whether the strength of the interfering signal outside the baseband is greater than a predetermined value comprises:
judging whether the signal strength indicated value is greater than a first preset value or not and whether the out-of-band noise energy value is greater than a second preset value or not every preset time;
if the signal strength indicating value is larger than the first preset value and the out-of-band noise energy value is larger than the second preset value, judging that the signal strength indicating value is larger than the first preset value for a first preset number of times;
the strength of the interfering signal outside the baseband is greater than the predetermined value.
4. The method of claim 1, wherein the detecting the interfering signal outside the baseband using a digital signal processing algorithm comprises:
an updated received signal strength indicator value, an out-of-band noise energy value, and a received signal strength indicator value are obtained using a digital signal processing algorithm.
5. The method of claim 4, wherein the determining whether the strength of the interference signal outside the baseband is greater than a predetermined value comprises:
judging whether the updated received signal strength indicating value is larger than a third preset value, whether the received signal strength indicating value is smaller than a fourth preset value and whether the out-of-band noise energy value is larger than a fifth preset value at intervals of preset time;
if the updated received signal strength indicating value is larger than a third preset value, the received signal strength indicating value is smaller than a fourth preset value and the out-of-band noise energy value is larger than a fifth preset value after continuous second preset times, the interference signal out of the baseband is larger than the preset value; alternatively, the first and second electrodes may be,
judging whether the received signal strength indicated value is smaller than a sixth preset value or not and whether the out-of-band noise energy value is smaller than a seventh preset value or not at intervals of preset time;
if the received signal strength indicating value is smaller than the sixth preset value and the out-of-band noise energy value is smaller than the seventh preset value, judging that the received signal strength indicating value is smaller than the sixth preset value for a third preset number of times;
the strength of the interfering signal outside the baseband is greater than the predetermined value.
6. The method of claim 2, wherein the determining whether the strength of the interfering signal outside the baseband is greater than a predetermined value comprises:
judging whether the received signal strength indicating value is greater than an eighth preset value or not and whether the out-of-band noise energy value is greater than a ninth preset value or not at intervals of preset time;
if the received signal strength indicating 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 count of the first counter is increased to a fourth preset number of times, and the count of the second counter is increased once;
if the received signal strength indicating value is larger than an eighth preset value, the out-of-band noise energy value is smaller than a 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, 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 greater than a fifth preset number of times, the interference signal outside the baseband is greater than the preset value.
7. The method of claim 1, wherein the controlling a gain of a 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 baseband being greater than a predetermined value, turning on an attenuator to suppress the interference signal.
8. The method of claim 7, wherein turning on the attenuator comprises, if the attenuator comprises at least a first stage attenuator and a second stage attenuator:
judging whether the first-stage attenuator is turned on or not;
if the first-stage attenuator is not started, starting the first-stage attenuator;
if the first-stage attenuator is already turned on, judging whether the second-stage attenuator is turned on;
and if the second-stage attenuator is not turned on, turning on the second-stage attenuator.
9. The zero intermediate frequency or low intermediate frequency architecture is characterized by 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 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 suppress the interference signal.
10. An apparatus having a storage function, characterized in that the apparatus stores program data which can be executed to implement the method according to any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010251455.6A CN113497633B (en) | 2020-04-01 | 2020-04-01 | Method for improving IP2 index of zero intermediate frequency and low intermediate frequency architecture receiver and architecture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010251455.6A CN113497633B (en) | 2020-04-01 | 2020-04-01 | Method for improving IP2 index of zero intermediate frequency and low intermediate frequency architecture receiver and architecture thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113497633A true CN113497633A (en) | 2021-10-12 |
| CN113497633B CN113497633B (en) | 2023-05-09 |
Family
ID=77994428
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010251455.6A Active CN113497633B (en) | 2020-04-01 | 2020-04-01 | Method for improving IP2 index of zero intermediate frequency and low intermediate frequency architecture receiver and architecture thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113497633B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115333655A (en) * | 2022-10-10 | 2022-11-11 | 华安中云股份有限公司 | Method and device for automatically detecting interference, backpack base station and storage medium |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040203403A1 (en) * | 2002-12-30 | 2004-10-14 | Cutcher Jeffrey Lee | 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) |
| WO2007008314A2 (en) * | 2005-07-06 | 2007-01-18 | Motorola, Inc. | Rf receiver, wireless communication terminal and method of operation |
| US20070110193A1 (en) * | 2005-10-07 | 2007-05-17 | Starkey Laboratories, Inc. | Automatic gain control with out of band blocking signal compensation |
| WO2009099786A2 (en) * | 2008-02-01 | 2009-08-13 | Motorola, Inc. | Receiver and method of operation for use in mobile communications |
| US20090239489A1 (en) * | 2008-03-24 | 2009-09-24 | Kaczman Daniel L | Receiver configurable in a plurality of modes |
| CN102106091A (en) * | 2008-07-31 | 2011-06-22 | 高通股份有限公司 | Method and apparatus for providing jammer detection in a receiver |
-
2020
- 2020-04-01 CN CN202010251455.6A patent/CN113497633B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040203403A1 (en) * | 2002-12-30 | 2004-10-14 | Cutcher Jeffrey Lee | 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) |
| WO2007008314A2 (en) * | 2005-07-06 | 2007-01-18 | Motorola, Inc. | Rf receiver, wireless communication terminal and method of operation |
| US20070110193A1 (en) * | 2005-10-07 | 2007-05-17 | Starkey Laboratories, Inc. | Automatic gain control with out of band blocking signal compensation |
| WO2009099786A2 (en) * | 2008-02-01 | 2009-08-13 | Motorola, Inc. | Receiver and method of operation for use in mobile communications |
| US20090239489A1 (en) * | 2008-03-24 | 2009-09-24 | Kaczman Daniel L | Receiver configurable in a plurality of modes |
| CN102106091A (en) * | 2008-07-31 | 2011-06-22 | 高通股份有限公司 | Method and apparatus for providing jammer detection in a receiver |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115333655A (en) * | 2022-10-10 | 2022-11-11 | 华安中云股份有限公司 | Method and device for automatically detecting interference, backpack base station and storage medium |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113497633B (en) | 2023-05-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7835687B2 (en) | Jamming detector and jamming detecting method | |
| US8600331B2 (en) | Radio receiver with reconfigurable baseband channel filter | |
| CN102089988A (en) | Jammer detection with adaptive fast attack/slow release response for continuous and burst mode | |
| KR20030067687A (en) | A radio receiver | |
| CN109756240B (en) | Wireless communication receiver with gain control device and gain control method | |
| JP2002525957A (en) | Intelligent control of receiver linearity based on interference | |
| WO2020224315A1 (en) | Method for improving performance of low-intermediate frequency receiver, storage medium, and receiver | |
| US11888540B2 (en) | Apparatus for radio-frequency receiver with interference detection and associated methods | |
| CN112289336B (en) | Audio signal processing method and device | |
| CN113497633B (en) | Method for improving IP2 index of zero intermediate frequency and low intermediate frequency architecture receiver and architecture thereof | |
| JP6205773B2 (en) | Control device, frequency control method, and reception device | |
| CN113270107A (en) | Method and device for acquiring noise loudness in audio signal and electronic equipment | |
| US20080068080A1 (en) | Spectrum Analyzing Method, Distortion Detector and Distortion Compensation Amplifying Device | |
| US7979041B1 (en) | Out-of-channel received signal strength indication (RSSI) for RF front end | |
| CN112953572B (en) | Low-delay small-jitter radio station squelch method | |
| EP2651083B1 (en) | Radio receiver with reconfigurable baseband channel filter | |
| CN114598337B (en) | Anti-interference method for zero intermediate frequency terminal, terminal and storage medium | |
| CN114520988B (en) | Squelch control method, device, equipment and readable storage medium | |
| CN214045603U (en) | Communication device and receiver | |
| CN114650203B (en) | Single-frequency amplitude noise suppression measurement method | |
| CN108445516A (en) | Solution in frequency domain device and method | |
| CN115996062A (en) | Control method of low noise amplifying circuit, processor, receiver and storage medium | |
| JP4542673B2 (en) | Receiver | |
| CN112887956A (en) | Bluetooth signal processing method and device | |
| CN115664443A (en) | Reception weak signal processing method and device, vehicle-mounted radio and medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |