CN111478710B - Method and system for suppressing adjacent channel interference, receiver and communication system - Google Patents
Method and system for suppressing adjacent channel interference, receiver and communication system Download PDFInfo
- Publication number
- CN111478710B CN111478710B CN202010275821.1A CN202010275821A CN111478710B CN 111478710 B CN111478710 B CN 111478710B CN 202010275821 A CN202010275821 A CN 202010275821A CN 111478710 B CN111478710 B CN 111478710B
- Authority
- CN
- China
- Prior art keywords
- gain
- receiver
- channel interference
- adjacent channel
- value
- 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.)
- Active
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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Noise Elimination (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
The invention discloses an adjacent channel interference suppression method and system, a receiver and a communication system, wherein the adjacent channel interference suppression method comprises the following steps: acquiring a current receiving gain table in a receiver under an adjacent channel interference scene; calculating gain linearity of the low noise amplifier in the receiver at a gain mode switching point according to a current receiving gain table; judging whether the gain linearity is within a preset range, if not, adjusting the current receiving gain table to generate a target receiving gain table; and performing adjacent channel interference suppression according to the target receiving gain table. On the premise of not increasing algorithm processing complexity and production line cost, the invention can reduce the influence of the radio frequency front-end device and matching on the receiving gain linearity of the whole receiving channel of the receiver based on the existing receiving gain table and baseband demodulation capacity, thereby effectively improving the out-of-band rejection performance of the receiver in a communication system and solving the problem of the deterioration of the strong interference performance of the adjacent cell under the actual network configuration.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a method and a system for suppressing adjacent channel interference, a receiver, and a communication system.
Background
The receiver in the communication system realizes the control of the received RSSI (received signal strength indicator) by adjusting the gain configuration of a receiving path, and ensures that the received signal strength is maintained at a fixed value. The receive path gain is typically in the form of a fixed stepped (e.g., 3dB step) receive gain table that is adjusted to cover the gain range required by a normal communications receiver by adjusting the LNA (low noise amplifier) gain mode and other digital gain configurations on the link, where the LNA characteristics have the greatest impact on out-of-band interference.
In an actual signal transmission scenario, a strong interference cell adjacent to the frequency of the working cell always exists, which causes the RSSI of the working cell to be reduced, and at this time, the algorithm needs to judge the adjacent-frequency interference scenario and adjust a proper receiving gain configuration, which generally needs to be adjusted to the low gain state of the LNA, so as to ensure that the radio frequency front end is not compressed, and at the same time, it needs to ensure that the receiving SNR (signal-to-noise ratio) meets the requirement of the throughput rate standard. The above needs are based on an accurate linear receive gain configuration table. The receiving gain linearity depends on the gain table linearity of the receiver on one hand and is influenced by the matching between the radio frequency front-end device and the LNA inside the receiver on the other hand, and the linear gain table meeting all channels can not be obtained basically by calibrating or optimizing the receiver configuration according to the conclusion of practical debugging experience.
The system algorithm is performed according to a strict 3dB step gain table when adjusting the gain, so if the gain table is not linear, the LNA gain mode and the target gain cannot be accurately adjusted and controlled under the condition of large out-of-band interference, thereby causing the receiving performance of the receiver to deteriorate.
Disclosure of Invention
The technical problem to be solved by the present invention is to overcome the defect that the out-of-band interference suppression performance of the receiver in the prior art cannot meet the actual requirement, and the present invention aims to provide an adjacent channel interference suppression method and system, a receiver, and a communication system.
The invention solves the technical problems through the following technical scheme:
the invention provides an adjacent channel interference suppression method of a receiver, which comprises the following steps:
acquiring a current receiving gain table in a receiver under an adjacent channel interference scene;
calculating gain linearity of the low noise amplifier in the receiver at a gain mode switching point according to the current receiving gain table;
judging whether the gain linearity is in a preset range, if not, adjusting the current receiving gain table to generate a target receiving gain table;
under the target receiving gain table, the gain linearity of the low noise amplifier at a gain mode switching point is in the preset range;
and performing adjacent channel interference suppression according to the target receiving gain table.
Preferably, the gain mode of the low noise amplifier comprises a high gain mode and a low gain mode;
the step of calculating the gain linearity of the low noise amplifier in the receiver at the gain mode switching point according to the current receiving gain table comprises:
respectively obtaining a first gain value corresponding to each first control word in the high gain mode and a second gain value corresponding to each second control word in the low gain mode in the current receiving gain table;
wherein the first control words are sequentially ordered from high to low according to the first gain value, and the second control words are sequentially ordered from high to low according to the second gain value;
calculating a gain difference between a minimum of the first gain values and a maximum of the second gain values;
wherein the gain difference is used to characterize the gain linearity.
Preferably, the step of determining whether the gain linearity is within a preset range, and if not, adjusting the current receiving gain table to generate a target receiving gain table includes:
judging whether the gain difference value is within the preset range, if so, taking the current receiving gain table as the target receiving gain table; if not, removing the minimum value in the first gain values and the corresponding first control word from the current receiving gain table to generate a new current receiving gain table, and re-executing the step of respectively obtaining a first gain value corresponding to each first control word in the high gain mode and a second gain value corresponding to each second control word in the low gain mode in the current receiving gain table;
the step of performing adjacent channel interference suppression according to the target receiving gain table comprises:
and acquiring a target control word corresponding to the maximum value of the second gain value of the low noise amplifier in the low gain mode in the target receiving gain table, and performing adjacent channel interference suppression according to the target control word.
Preferably, the step of obtaining the current reception gain table in the receiver further comprises:
acquiring a received signal strength parameter in the receiver;
and judging whether the received signal strength parameter meets a set condition, if so, determining that the receiver is in an adjacent channel interference scene.
Preferably, the step of obtaining the received signal strength parameter in the receiver comprises:
acquiring a first RSSI corresponding to a radio frequency receiver in a receiver and a second RSSI corresponding to a digital receiver;
the step of judging whether the received signal strength parameter meets the set condition, if yes, determining that the receiver is in the adjacent channel interference scene includes:
judging whether the difference value between the first RSSI and the second RSSI is larger than a set threshold value or not, if so, determining that the receiver is in an adjacent channel interference scene; and if not, determining that the receiver is in a non-adjacent channel interference scene.
Preferably, in the target receiving gain table, the absolute value of the difference between the gain values of the adjacent control words in the same gain mode of the low noise amplifier is 3 dB;
the preset range is 0-6 dB.
The invention also provides an adjacent channel interference suppression system of the receiver, which comprises a gain table acquisition module, a gain linearity calculation module, a first judgment module and an interference suppression module;
the gain table acquisition module is used for acquiring a current receiving gain table in the receiver under an adjacent channel interference scene;
the gain linearity calculation module is used for calculating gain linearity of the low noise amplifier in the receiver at a gain mode switching point according to the current receiving gain table;
the first judging module is used for judging whether the gain linearity is within a preset range, and if not, adjusting the current receiving gain table to generate a target receiving gain table;
under the target receiving gain table, the gain linearity of the low noise amplifier at a gain mode switching point is in the preset range;
and the interference suppression module is used for performing adjacent channel interference suppression according to the target receiving gain table.
Preferably, the gain mode of the low noise amplifier comprises a high gain mode and a low gain mode;
the gain linearity calculation module comprises a gain value acquisition unit and a calculation unit;
the gain value obtaining unit is configured to obtain a first gain value corresponding to each first control word in the high gain mode and a second gain value corresponding to each second control word in the low gain mode in the current receive gain table, respectively;
wherein the first control words are sequentially ordered from high to low according to the first gain value, and the second control words are sequentially ordered from high to low according to the second gain value;
the calculation unit is used for calculating a gain difference value between the minimum value in the first gain values and the maximum value in the second gain values;
wherein the gain difference is used to characterize the gain linearity.
Preferably, the first determining module is configured to determine whether the gain difference is within the preset range, and if so, take the current receiving gain table as the target receiving gain table; if not, removing the minimum value in the first gain values and the corresponding first control word from the current receiving gain table to generate a new current receiving gain table, and recalling the gain value acquisition unit;
the interference suppression module is configured to obtain a target control word corresponding to a maximum value of the second gain values of the low noise amplifier in the target receiving gain table in the low gain mode, and perform adjacent channel interference suppression according to the target control word.
Preferably, the adjacent channel interference suppression system further includes a signal strength parameter obtaining module and a second judging module;
the signal strength parameter acquisition module is used for acquiring a received signal strength parameter in the receiver;
the second judging module is used for judging whether the received signal strength parameter meets a set condition, and if so, the receiver is determined to be in an adjacent channel interference scene.
Preferably, the signal strength parameter obtaining module is configured to obtain a first RSSI corresponding to a radio frequency receiver in the receiver and a second RSSI corresponding to a digital receiver;
the second judging module is used for judging whether a difference value between the first RSSI and the second RSSI is greater than a set threshold value, and if so, determining that the receiver is in an adjacent channel interference scene; if not, determining that the receiver is in a non-adjacent channel interference scene, and directly calling the current receiving gain table to suppress the adjacent channel interference.
Preferably, in the target receiving gain table, the absolute value of the difference between the gain values of the adjacent control words in the same gain mode of the low noise amplifier is 3 dB;
the preset range is 0-6 dB.
The invention also provides a receiver, which comprises the adjacent channel interference suppression system of the receiver.
The invention also provides a communication system comprising the receiver.
Preferably, the communication system includes an LTE (long term evolution system) system, an eMTC (enhanced machine type communication) system, an NB-I0T (narrow band internet) system, or an NR (new air interface) system.
The positive progress effects of the invention are as follows:
according to the invention, on the premise of not increasing algorithm processing complexity and production line cost, based on the existing receiving gain table and baseband demodulation capability, the influence of the radio frequency front-end device and matching on the receiving gain linearity of the whole receiving channel can be reduced, so that the out-of-band rejection performance of a receiver in a communication system is effectively improved, the accuracy of rejection on adjacent frequency interference is improved, and the problem of strong interference performance deterioration of adjacent cells under actual network configuration is solved.
Drawings
Fig. 1 is a flowchart of an adjacent channel interference suppression method of a receiver according to embodiment 1 of the present invention.
Fig. 2 is a flowchart of a method for suppressing adjacent channel interference of a receiver according to embodiment 2 of the present invention.
Fig. 3 is a block diagram of an adjacent channel interference suppression system of a receiver according to embodiment 3 of the present invention.
Fig. 4 is a block diagram of an adjacent channel interference suppression system of a receiver according to embodiment 4 of the present invention.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1, the method for suppressing adjacent channel interference of a receiver of this embodiment includes:
s101, acquiring a current receiving gain table in a receiver under an adjacent channel interference scene;
s102, calculating gain linearity of the low noise amplifier in the receiver at a gain mode switching point according to a current receiving gain table;
s103, judging whether the gain linearity is in a preset range, if not, adjusting a current receiving gain table to generate a target receiving gain table;
under the target receiving gain table, the gain linearity of the low-noise amplifier at the gain mode switching point is in a preset range;
and S104, performing adjacent channel interference suppression according to the target receiving gain table.
In the target receiving gain table, the absolute value of the difference between the gain values of the adjacent control words in the same gain mode of the low noise amplifier is 3dB, and the preset range is 0-6 dB.
In this embodiment, on the premise of not increasing algorithm processing complexity and production line cost, based on the existing reception gain table and baseband demodulation capability, the influence of the radio frequency front-end device and matching on the reception gain linearity of the whole reception path of the receiver can be reduced, thereby effectively improving the out-of-band rejection performance of the receiver in the communication system, improving the accuracy of rejection of adjacent-frequency interference, and solving the problem of strong interference performance deterioration of adjacent cells under actual network configuration.
Example 2
As shown in fig. 2, the method for suppressing adjacent channel interference of the receiver of this embodiment is a further improvement of embodiment 1, specifically:
step S101 is preceded by:
s10101, obtaining a received signal strength parameter in a receiver;
s10102, judging whether the received signal strength parameter meets the set condition, and if so, determining that the receiver is in the adjacent channel interference scene.
Specifically, step S10101 includes:
and acquiring a first RSSI corresponding to a radio frequency receiver in the receiver and a second RSSI corresponding to a digital receiver.
Step S10102 includes:
judging whether the difference value between the first RSSI and the second RSSI is larger than a set threshold value or not, and if so, determining that the receiver is in an adjacent channel interference scene; if not, determining that the receiver is in a non-adjacent channel interference scene, and directly performing adjacent channel interference suppression based on the current receiving gain table.
Namely, the scene identification is realized based on the comparison of the broadband RSSI corresponding to the radio frequency receiver and the narrowband RSSI corresponding to the digital receiver.
The antenna is sequentially in communication connection with the front-end filter, the matching circuit and the receiver, the receiver comprises a radio frequency receiver and a digital receiver which are sequentially in communication connection, and the radio frequency receiver comprises an LNA, a mixer, an amplifier, an analog-to-digital converter and the like which are sequentially in communication connection.
The gain modes of the low noise amplifier include a high gain mode and a low gain mode.
Step S102 includes:
s1021, respectively acquiring a first gain value corresponding to each first control word in a high gain mode and a second gain value corresponding to each second control word in a low gain mode in the current receiving gain table;
the plurality of first control words are sequentially ordered from high to low according to the first gain value, and the plurality of second control words are sequentially ordered from high to low according to the second gain value;
s1022, calculating a gain difference value between the minimum value in the first gain values and the maximum value in the second gain values;
wherein the gain difference is used to characterize the gain linearity.
Step S103 includes:
s1031, judging whether the gain difference value is within a preset range, and if so, executing a step S1032; if not, executing step S1033;
s1032, taking the current receiving gain table as a target receiving gain table;
s1033, removing the minimum value of the first gain values and the corresponding first control word from the current reception gain table to generate a new current reception gain table, and re-executing step S1021.
Step S104 includes:
s1041, obtaining a target control word corresponding to the maximum value in the second gain value of the low noise amplifier in the low gain mode in the target receiving gain table, and performing adjacent channel interference suppression according to the target control word.
The following is a detailed description with reference to examples:
(1) and acquiring a first RSSI corresponding to a radio frequency receiver in the receiver and a second RSSI corresponding to the digital receiver, and determining that the receiver is in an adjacent channel interference scene when the difference value between the first RSSI and the second RSSI is greater than a set threshold value.
When the difference value between the first RSSI and the second RSSI is smaller than or equal to a set threshold value, the receiver is determined to be in a non-adjacent-channel interference scene, and adjacent-channel interference suppression is directly carried out on the basis of a current receiving gain table, so that the performance of the received SNR is ensured.
(2) In the adjacent channel interference scenario, the software automatically loads the receiving gain table in the receiver (specifically, see the following table):
(3) the DSP (digital signal processing) processor starts to read the receiving gain table and searches the gain linearity at the LNA gain mode switching point, namely, judges the gain value linearity (gain difference) corresponding to the lowest gain configuration G _ LNA high [0] of the LNA high gain interval and the highest gain configuration G _ LNA low [0] of the LNA low gain interval:
when the gain difference value of the Gh0-Gl0 is 0-6dB, determining that the new current receiving gain table is the target receiving gain table;
when Gh0-Gl 0<0dB, the DSP processor removes the control word G _ LNA high [0] and the corresponding calibration gain value from the current receiving gain table to generate a new current receiving gain table, and the two control words at the LNA gain mode switching point are G _ LNA high [1] and G _ LNA low [0 ];
when the gain difference value of the Gh1-Gl0 is 0-6dB, determining that the new current receiving gain table is the target receiving gain table;
when Gh1-Gl0<0dB, the DSP processor removes the control word G _ LNA high [1] and the corresponding calibration gain value from the current receiving gain table to generate a new current receiving gain table, the two control words at the LNA gain mode switching point are G _ LNA high [2] and G _ LNA low [0], and so on until the gain difference value corresponding to the adjacent control word in the current receiving gain table is between 0-6dB, and then the current receiving gain table at the moment is used as the target receiving gain table.
In addition, the initial reception gain table and the newly generated target reception gain table are both stored in the memory. For a non-adjacent channel strong interference scene, still adopting an initial receiving gain table to ensure the performance of a receiving SNR; the newly generated target receiving gain table is only applied to the adjacent channel interference scene.
(4) Calling the control word G _ LNA low [0] of the maximum gain value in the LNA low gain mode in the target receiving gain table to carry out the adjacent channel interference suppression.
In the adjacent frequency interference scene, the gain linearity at the gain mode switching position in the receiving gain table is automatically judged to dynamically adjust the configuration of the control word of the receiving gain table, so that the control word of the maximum gain value in the LNA low gain mode can be accurately called to carry out adjacent frequency interference suppression, the influence of a radio frequency front-end device and matching on the receiving gain linearity of the whole receiving channel of the receiver is further reduced, the out-of-band suppression performance of the receiver in a communication system is effectively improved, and the accuracy of suppressing the adjacent frequency interference is improved.
In addition, other receiving modules in the receiver after the LNA adopt a digital gain configuration, have strict linearity, and thus have strict 3dB linearity in the same LNA gain mode in a receiving gain table formed by combining with the LNA.
When AGC (automatic gain control) calibration is carried out on a production line, in order to give consideration to the direct current rate and the poor detection effective rate, the maximum gain and the minimum gain are increased by a limited range, and a fluctuation range of +/-10dB is allowed to be kept with a target value. Theoretically, the worst value of Gh0-Gl0 is-20 dB, i.e. 7 LNA _ high control words are removed in the worst case. And m is greater than 7 in the actual receiving gain table, the extreme situation that no control word can go can be avoided.
In this embodiment, on the premise of not increasing algorithm processing complexity and production line cost, based on the existing reception gain table and baseband demodulation capability, the influence of the radio frequency front-end device and matching on the reception gain linearity of the whole reception path of the receiver can be reduced, thereby effectively improving the out-of-band rejection performance of the receiver in the communication system, improving the accuracy of rejection of adjacent-frequency interference, and solving the problem of strong interference performance deterioration of adjacent cells under actual network configuration.
Example 3
As shown in fig. 3, the adjacent channel interference suppression system of the receiver of this embodiment includes a gain table obtaining module 1, a gain linearity calculating module 2, a first judging module 3, and an interference suppression module 4.
In the adjacent channel interference scene, the gain table acquisition module 1 is used for acquiring a current receiving gain table in the receiver;
the gain linearity calculation module 2 is used for calculating the gain linearity of the low noise amplifier in the receiver at the gain mode switching point according to the current receiving gain table;
the first judging module 3 is used for judging whether the gain linearity is within a preset range, and if not, adjusting the current receiving gain table to generate a target receiving gain table;
under the target receiving gain table, the gain linearity of the low-noise amplifier at the gain mode switching point is in a preset range;
the interference suppression module 4 is configured to perform adjacent channel interference suppression according to the target reception gain table.
In the target receiving gain table, the absolute value of the difference value of the gain values of the adjacent control words under the same gain mode of the low noise amplifier is 3 dB;
the preset range is 0-6 dB.
In this embodiment, on the premise of not increasing algorithm processing complexity and production line cost, based on the existing reception gain table and baseband demodulation capability, the influence of the radio frequency front-end device and matching on the reception gain linearity of the whole reception path of the receiver can be reduced, thereby effectively improving the out-of-band rejection performance of the receiver in the communication system, improving the accuracy of rejection of adjacent-frequency interference, and solving the problem of strong interference performance deterioration of adjacent cells under actual network configuration.
Example 4
As shown in fig. 4, the adjacent channel interference suppression system of the receiver of this embodiment is a further improvement of embodiment 3, specifically:
the adjacent channel interference suppression system further comprises a signal strength parameter acquisition module 5 and a second judgment module 6.
The signal strength parameter obtaining module 5 is used for obtaining a received signal strength parameter in the receiver;
the second judging module 6 is configured to judge whether the received signal strength parameter meets a set condition, and if so, determine that the receiver is in an adjacent channel interference scenario.
Specifically, the signal strength parameter obtaining module 5 is configured to obtain a first RSSI corresponding to a radio frequency receiver in the receiver and a second RSSI corresponding to a digital receiver;
the second judging module 6 is configured to judge whether a difference between the first RSSI and the second RSSI is greater than a set threshold, and if so, determine that the receiver is in an adjacent channel interference scenario; if not, determining that the receiver is in a non-adjacent channel interference scene, and directly calling the current receiving gain table to suppress the adjacent channel interference.
Namely, the scene identification is realized based on the comparison of the broadband RSSI corresponding to the radio frequency receiver and the narrowband RSSI corresponding to the digital receiver.
The antenna is sequentially in communication connection with the front-end filter, the matching circuit and the receiver, the receiver comprises a radio frequency receiver and a digital receiver which are sequentially in communication connection, and the radio frequency receiver comprises an LNA, a mixer, an amplifier, an analog-to-digital converter and the like which are sequentially in communication connection.
The gain mode of the low noise amplifier comprises a high gain mode and a low gain mode;
the gain linearity calculation module 2 comprises a gain value acquisition unit 7 and a calculation unit 8;
the gain value obtaining unit 7 is configured to obtain a first gain value corresponding to each first control word in a high gain mode in the current reception gain table, and a second gain value corresponding to each second control word in a low gain mode;
the plurality of first control words are sequentially ordered from high to low according to the first gain value, and the plurality of second control words are sequentially ordered from high to low according to the second gain value;
the calculating unit 8 is used for calculating a gain difference value between the minimum value in the first gain values and the maximum value in the second gain values;
wherein the gain difference is used to characterize the gain linearity.
The first judging module 3 is used for judging whether the gain difference value is within a preset range, and if so, taking the current receiving gain table as a target receiving gain table;
if not, removing the minimum value in the first gain values and the corresponding first control word from the current receiving gain table to generate a new current receiving gain table, and calling the gain value obtaining unit again.
The interference suppression module 4 is configured to obtain a target control word corresponding to a maximum value in the second gain value of the low noise amplifier in the target receiving gain table in the low gain mode, and perform adjacent channel interference suppression according to the target control word.
The following is a detailed description with reference to examples:
(1) and acquiring a first RSSI corresponding to a radio frequency receiver in the receiver and a second RSSI corresponding to the digital receiver, and determining that the receiver is in an adjacent channel interference scene when the difference value between the first RSSI and the second RSSI is greater than a set threshold value.
When the difference value between the first RSSI and the second RSSI is smaller than or equal to a set threshold value, the receiver is determined to be in a non-adjacent-channel interference scene, and adjacent-channel interference suppression is directly carried out on the basis of a current receiving gain table, so that the performance of the received SNR is ensured.
(2) In the adjacent channel interference scenario, the software automatically loads the receiving gain table in the receiver (specifically, see the following table):
(3) the DSP (digital signal processing) processor starts to read the receiving gain table and searches the gain linearity at the LNA gain mode switching point, namely, judges the gain value linearity (gain difference) corresponding to the lowest gain configuration G _ LNA high [0] of the LNA high gain interval and the highest gain configuration G _ LNA low [0] of the LNA low gain interval:
when the gain difference value of the Gh0-Gl0 is 0-6dB, determining that the new current receiving gain table is the target receiving gain table;
when Gh0-Gl 0<0dB, the DSP processor removes the control word G _ LNA high [0] and the corresponding calibration gain value from the current receiving gain table to generate a new current receiving gain table, and the two control words at the LNA gain mode switching point are G _ LNA high [1] and G _ LNA low [0 ];
when the gain difference value of the Gh1-Gl0 is 0-6dB, determining that the new current receiving gain table is the target receiving gain table;
when Gh1-Gl0<0dB, the DSP processor removes the control word G _ LNA high [1] and the corresponding calibration gain value from the current receiving gain table to generate a new current receiving gain table, the two control words at the LNA gain mode switching point are G _ LNA high [2] and G _ LNA low [0], and so on until the gain difference value corresponding to the adjacent control word in the current receiving gain table is between 0-6dB, and then the current receiving gain table at the moment is used as the target receiving gain table.
In addition, the initial reception gain table and the newly generated target reception gain table are both stored in the memory. For a non-adjacent channel strong interference scene, still adopting an initial receiving gain table to ensure the performance of a receiving SNR; the newly generated target receiving gain table is only applied to the adjacent channel interference scene.
(4) Calling the control word G _ LNA low [0] of the maximum gain value in the LNA low gain mode in the target receiving gain table to carry out the adjacent channel interference suppression.
In the adjacent frequency interference scene, the gain linearity at the gain mode switching position in the receiving gain table is automatically judged to dynamically adjust the configuration of the control word of the receiving gain table, so that the control word of the maximum gain value in the LNA low gain mode can be accurately called to carry out adjacent frequency interference suppression, the influence of a radio frequency front-end device and matching on the receiving gain linearity of the whole receiving channel of the receiver is further reduced, the out-of-band suppression performance of the receiver in a communication system is effectively improved, and the accuracy of suppressing the adjacent frequency interference is improved.
In addition, other receiving modules in the receiver after the LNA adopt a digital gain configuration, have strict linearity, and thus have strict 3dB linearity in the same LNA gain mode in a receiving gain table formed by combining with the LNA.
When AGC calibration is carried out on a production line, in order to give consideration to the straight-through rate and the poor detection effective rate, the maximum gain and the minimum gain are increased by a limited range, and a fluctuation range of +/-10dB is allowed to be obtained along with a target value. Theoretically, the worst value of Gh0-Gl0 is-20 dB, i.e. 7 LNA _ high control words are removed in the worst case. And m is greater than 7 in the actual receiving gain table, the extreme situation that no control word can go can be avoided.
In this embodiment, on the premise of not increasing algorithm processing complexity and production line cost, based on the existing reception gain table and baseband demodulation capability, the influence of the radio frequency front-end device and matching on the reception gain linearity of the whole reception path of the receiver can be reduced, thereby effectively improving the out-of-band rejection performance of the receiver in the communication system, improving the accuracy of rejection of adjacent-frequency interference, and solving the problem of strong interference performance deterioration of adjacent cells under actual network configuration.
Example 5
The receiver of the present embodiment includes the adjacent channel interference suppression system of the receiver in embodiment 3 or 4.
The receiver of the embodiment has good out-of-band rejection performance, and solves the problem of deterioration of the strong interference performance of the adjacent cell under actual network configuration.
Example 6
The communication system of the present embodiment includes the receiver of embodiment 5.
The communication system includes, but is not limited to, an LTE system, an eMTC system, an NBIOT system, or an NR system.
The receiver in the communication system of the embodiment has good out-of-band rejection performance, and can solve the problem of deterioration of the strong interference performance of the neighboring cell under actual network configuration.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (13)
1. An adjacent channel interference suppression method of a receiver, the adjacent channel interference suppression method comprising:
acquiring a current receiving gain table in a receiver under an adjacent channel interference scene;
calculating gain linearity of the low noise amplifier in the receiver at a gain mode switching point according to the current receiving gain table;
judging whether the gain linearity is in a preset range, if not, adjusting the current receiving gain table to generate a target receiving gain table;
under the target receiving gain table, the gain linearity of the low noise amplifier at a gain mode switching point is in the preset range;
performing adjacent channel interference suppression according to the target receiving gain table;
the gain mode of the low noise amplifier comprises a high gain mode and a low gain mode;
the step of calculating the gain linearity of the low noise amplifier in the receiver at the gain mode switching point according to the current receiving gain table comprises:
respectively obtaining a first gain value corresponding to each first control word in the high gain mode and a second gain value corresponding to each second control word in the low gain mode in the current receiving gain table;
wherein the first control words are sequentially ordered from high to low according to the first gain value, and the second control words are sequentially ordered from high to low according to the second gain value;
calculating a gain difference between a minimum of the first gain values and a maximum of the second gain values;
wherein the gain difference is used to characterize the gain linearity.
2. The method of claim 1, wherein the step of determining whether the gain linearity is within a predetermined range, and if not, adjusting the current receive gain table to generate a target receive gain table comprises:
judging whether the gain difference value is within the preset range, if so, taking the current receiving gain table as the target receiving gain table;
if not, removing the minimum value in the first gain values and the corresponding first control word from the current receiving gain table to generate a new current receiving gain table, and re-executing the step of respectively obtaining a first gain value corresponding to each first control word in the high gain mode and a second gain value corresponding to each second control word in the low gain mode in the current receiving gain table;
the step of performing adjacent channel interference suppression according to the target receiving gain table comprises:
and acquiring a target control word corresponding to the maximum value of the second gain value of the low noise amplifier in the low gain mode in the target receiving gain table, and performing adjacent channel interference suppression according to the target control word.
3. The method for suppressing adjacent channel interference of a receiver of claim 1, wherein the step of obtaining a current reception gain table in the receiver further comprises, before the step of:
acquiring a received signal strength parameter in the receiver;
and judging whether the received signal strength parameter meets a set condition, if so, determining that the receiver is in an adjacent channel interference scene.
4. The method of suppressing adjacent channel interference of a receiver according to claim 3, wherein said step of obtaining a received signal strength parameter in said receiver comprises:
acquiring a first RSSI corresponding to a radio frequency receiver in the receiver and a second RSSI corresponding to a digital receiver;
the step of judging whether the received signal strength parameter meets the set condition, if yes, determining that the receiver is in the adjacent channel interference scene includes:
judging whether the difference value between the first RSSI and the second RSSI is larger than a set threshold value or not, if so, determining that the receiver is in an adjacent channel interference scene; and if not, determining that the receiver is in a non-adjacent channel interference scene.
5. The method of claim 1, wherein in the target reception gain table, the absolute value of the difference between the gain values of the adjacent control words in the same gain mode of the lna is 3 dB;
the preset range is 0-6 dB.
6. The adjacent channel interference suppression system of the receiver is characterized by comprising a gain table acquisition module, a gain linearity calculation module, a first judgment module and an interference suppression module;
the gain table acquisition module is used for acquiring a current receiving gain table in the receiver under an adjacent channel interference scene;
the gain linearity calculation module is used for calculating gain linearity of the low noise amplifier in the receiver at a gain mode switching point according to the current receiving gain table;
the first judging module is used for judging whether the gain linearity is within a preset range, and if not, adjusting the current receiving gain table to generate a target receiving gain table;
under the target receiving gain table, the gain linearity of the low noise amplifier at a gain mode switching point is in the preset range;
the interference suppression module is used for performing adjacent channel interference suppression according to the target receiving gain table;
the gain mode of the low noise amplifier comprises a high gain mode and a low gain mode;
the gain linearity calculation module comprises a gain value acquisition unit and a calculation unit;
the gain value obtaining unit is configured to obtain a first gain value corresponding to each first control word in the high gain mode and a second gain value corresponding to each second control word in the low gain mode in the current receive gain table, respectively;
wherein the first control words are sequentially ordered from high to low according to the first gain value, and the second control words are sequentially ordered from high to low according to the second gain value;
the calculation unit is used for calculating a gain difference value between the minimum value in the first gain values and the maximum value in the second gain values;
wherein the gain difference is used to characterize the gain linearity.
7. The system for suppressing adjacent channel interference of a receiver according to claim 6, wherein said first determining module is configured to determine whether the gain difference is within the preset range, and if so, take the current receiving gain table as the target receiving gain table; if not, removing the minimum value in the first gain values and the corresponding first control word from the current receiving gain table to generate a new current receiving gain table, and recalling the gain value acquisition unit;
the interference suppression module is configured to obtain a target control word corresponding to a maximum value of the second gain values of the low noise amplifier in the target receiving gain table in the low gain mode, and perform adjacent channel interference suppression according to the target control word.
8. The system of claim 6, wherein the system further comprises a signal strength parameter acquisition module and a second determination module;
the signal strength parameter acquisition module is used for acquiring a received signal strength parameter in the receiver;
the second judging module is used for judging whether the received signal strength parameter meets a set condition, and if so, the receiver is determined to be in an adjacent channel interference scene.
9. The system of claim 8, wherein the signal strength parameter obtaining module is configured to obtain a first RSSI corresponding to a radio frequency receiver of the receiver and a second RSSI corresponding to a digital receiver;
the second judging module is used for judging whether a difference value between the first RSSI and the second RSSI is greater than a set threshold value, and if so, determining that the receiver is in an adjacent channel interference scene; if not, determining that the receiver is in a non-adjacent channel interference scene, and directly calling the current receiving gain table to suppress the adjacent channel interference.
10. The system of claim 6, wherein in the target receive gain table, the absolute value of the difference between the gain values of adjacent control words for the same gain mode of the lna is 3 dB;
the preset range is 0-6 dB.
11. A receiver, characterized in that it comprises the adjacent channel interference suppression system of the receiver of any of claims 6 to 10.
12. A communication system, characterized in that it comprises a receiver according to claim 11.
13. The communication system of claim 12, wherein the communication system comprises an LTE system, an eMTC system, an NBIOT system, or an NR system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010275821.1A CN111478710B (en) | 2020-04-09 | 2020-04-09 | Method and system for suppressing adjacent channel interference, receiver and communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010275821.1A CN111478710B (en) | 2020-04-09 | 2020-04-09 | Method and system for suppressing adjacent channel interference, receiver and communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111478710A CN111478710A (en) | 2020-07-31 |
| CN111478710B true CN111478710B (en) | 2021-08-20 |
Family
ID=71751408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010275821.1A Active CN111478710B (en) | 2020-04-09 | 2020-04-09 | Method and system for suppressing adjacent channel interference, receiver and communication system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111478710B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112235855B (en) * | 2020-09-25 | 2022-09-30 | 锐迪科微电子（上海）有限公司 | Signal processing method and device |
| CN112312534B (en) * | 2020-10-30 | 2022-08-16 | 展讯通信(天津)有限公司 | Method and system for adjusting receiving link gain and intelligent terminal |
| CN114641056B (en) * | 2020-12-16 | 2024-03-15 | 阿里巴巴集团控股有限公司 | Processing unit and method for adjusting gain of receiver |
| CN114765846B (en) * | 2021-01-14 | 2023-06-09 | 海能达通信股份有限公司 | Method and related device for improving adjacent channel selectivity |
| CN113163427B (en) * | 2021-05-17 | 2022-08-05 | 深圳市友华通信技术有限公司 | Method for adjusting anti-interference parameters of wireless local area network |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101577558A (en) * | 2008-05-06 | 2009-11-11 | 凌阳科技股份有限公司 | Wireless receiving system and method with automatic gain control |
| CN103051300A (en) * | 2012-12-20 | 2013-04-17 | 广州润芯信息技术有限公司 | Gain-device switching-on/off adjusting method and device in automatic gain control system |
| CN103516322A (en) * | 2012-06-14 | 2014-01-15 | 创杰科技股份有限公司 | Automatic gain control device, automatic gain control gain setting method, and wireless communication transceiver |
| CN104144487A (en) * | 2013-05-06 | 2014-11-12 | 电信科学技术研究院 | Method for automatically controlling receiving channel gains and device |
| CN107147368A (en) * | 2017-04-19 | 2017-09-08 | 上海顺久电子科技有限公司 | The gain adjusting method and device of gain amplifier |
-
2020
- 2020-04-09 CN CN202010275821.1A patent/CN111478710B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101577558A (en) * | 2008-05-06 | 2009-11-11 | 凌阳科技股份有限公司 | Wireless receiving system and method with automatic gain control |
| CN103516322A (en) * | 2012-06-14 | 2014-01-15 | 创杰科技股份有限公司 | Automatic gain control device, automatic gain control gain setting method, and wireless communication transceiver |
| CN103051300A (en) * | 2012-12-20 | 2013-04-17 | 广州润芯信息技术有限公司 | Gain-device switching-on/off adjusting method and device in automatic gain control system |
| CN104144487A (en) * | 2013-05-06 | 2014-11-12 | 电信科学技术研究院 | Method for automatically controlling receiving channel gains and device |
| CN107147368A (en) * | 2017-04-19 | 2017-09-08 | 上海顺久电子科技有限公司 | The gain adjusting method and device of gain amplifier |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111478710A (en) | 2020-07-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111478710B (en) | Method and system for suppressing adjacent channel interference, receiver and communication system | |
| KR101051855B1 (en) | Current Reduction Due to Dynamic Receiver Adjustment in Communication Devices | |
| US7212798B1 (en) | Adaptive AGC in a wireless network receiver | |
| US8494469B2 (en) | Detection and mitigation of interference in a multimode receiver using variable bandwidth filter | |
| JPH08330986A (en) | Equipment and method for optimizing quality of receiving signal in radio receiver | |
| US9496905B2 (en) | Detection and mitigation of interference in a receiver | |
| CN108024277A (en) | Method, control device and the wireless access point of Regulate signal decay | |
| CN104467938A (en) | Method and system for selecting diversity reception merging mode | |
| US8331493B2 (en) | Bias removal of radio link quality estimates | |
| CN112118059B (en) | Method for reducing spurious interference, communication equipment and readable storage medium | |
| US7907589B2 (en) | Reception apparatus and reception method | |
| US20090318133A1 (en) | Error detector, error detecting method and control program thereof | |
| US10985791B1 (en) | Adaptive optimization of wireless receivers | |
| CN109150216B (en) | Dual-band receiver and automatic gain control method thereof | |
| CN115395973B (en) | Receiver automatic gain control method, circuit, radio frequency chip and wireless terminal | |
| CN101682341B (en) | Increasing sensitivity of radio receiver | |
| CN114257335B (en) | Data processing method, device and system, electronic device, medium | |
| US10931321B1 (en) | System and method for optimizing intermodulation performance of receivers | |
| EP2045931B1 (en) | Wireless terminal and level determining method | |
| CN116600377B (en) | Uplink receiving gain control method based on remote radio unit | |
| US9077418B2 (en) | Method for controlling receiving diversity of a receiver and a mobile station | |
| US8175561B2 (en) | Automatic optimization of RF receiver interference performance | |
| EP2873179A1 (en) | Thermal noise floor estimation robustness via multi-carrier combining | |
| KR20080078365A (en) | Method and apparatus for automatically setting gain state change point of low noise amplifier in mobile communication terminal |
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 |