CN112312534B - Method and system for adjusting receiving link gain and intelligent terminal - Google Patents
Method and system for adjusting receiving link gain and intelligent terminal Download PDFInfo
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- CN112312534B CN112312534B CN202011188763.5A CN202011188763A CN112312534B CN 112312534 B CN112312534 B CN 112312534B CN 202011188763 A CN202011188763 A CN 202011188763A CN 112312534 B CN112312534 B CN 112312534B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/245—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account received signal strength
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/52—Transmission power control [TPC] using AGC [Automatic Gain Control] circuits or amplifiers
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- 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
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- 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
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a method, a system and an intelligent terminal for adjusting the gain of a receiving link, wherein the adjusting method comprises the steps of obtaining a plurality of preset gain intervals; determining a preset AGC control word and a preset AGC control word group of a preset gain interval; after receiving power issued by a base station, selecting a preset AGC control word with a set number for signal receiving and acquiring a corresponding RSSI; and evaluating the RSSI to match a target AGC control word and adjusting the link gain by adopting the parameters of the target AGC control word group. According to the invention, adaptive AGC control words are judged and introduced through an RSSI evaluation process so as to be adaptive to match LNA of different gears, and the gain adjustment of a link is automatically completed; the AGC calibration process can be re-run according to different models of LNAs to complete the receiving gain adjustment of a new LNA, so that the receiving performance is ensured, the robustness of a receiving link is improved, the management risk of software versions is reduced, and flexible and variable customer requirements are met.
Description
Technical Field
The present invention relates to the field of data communication technologies, and in particular, to a method and a system for adjusting a receive link gain, and an intelligent terminal.
Background
In the research and development process of intelligent terminals such as mobile phones, the size and quality of received signals are important indexes for measuring the performance of equipment. The size of the signal received by the intelligent terminal is directly related to the distance from the base station, when the distance from the intelligent terminal to the base station is far, the signal received by the intelligent terminal becomes small, and when the signal is reduced to be below a certain receiving threshold, the receiving signal-to-noise ratio is reduced, the call quality is reduced, and call drop and interruption of communication with the base station can be caused in serious cases. At present, the above problems are generally improved by using an LNA (low noise amplifier), which has the characteristics of low noise figure and high gain, so that the receiving sensitivity of the terminal is improved, and the risk of communication interruption with a base station is reduced, that is, the LNA is adopted to enhance the signal receiving capability of the intelligent terminal, and increase the receiving dynamic range.
However, with the introduction of the LNA, the gain of the whole receiving chain needs to be readjusted due to the large gain of the LNA, so that the received signal is adjusted to a proper size to meet the optimal linear receiving power range of the ADC (analog-to-digital conversion) inside the radio frequency transceiver chip.
The existing adjusting scheme in the industry is to customize a set of link gain scheme according to the gain characteristic of the LNA, so that the receiving link gain with a specific LNA circuit can be well adjusted, however, the adjusting scheme is inflexible, and a set of link gain scheme can only adapt to one LNA or is compatible with a plurality of LNAs with similar gain parameters (gain deviation is within 3 dB); when other models of LNAs are used, then re-tuning is required and an adapted gain scheme is generated. The existing adjustment solutions thus cause two problems: (1) the bill of materials may be replaced due to reasons of reducing cost, one set of software can only be adapted to one LNA, the replacement of the LNA requires the software to be upgraded at the same time, and the risk of mismatch may exist. (2) Aiming at different customers, after the requirements for customizing the LNA are increased, a lot of manpower and energy are needed to be invested to perform the adaptation work of the software version, and the problems of high manpower cost, large workload, low efficiency and the like exist.
Disclosure of Invention
The invention aims to overcome the defects that in the prior art, only one LNA can be adapted to a set of link gain scheme due to the fact that the receiving link gain is customized to adapt to a low-noise amplifier, and the LNA is inflexible and low in efficiency, and provides a method and a system for adjusting the receiving link gain and an intelligent terminal.
The invention solves the technical problems through the following technical scheme:
the invention provides a method for adjusting the gain of a receiving link, which is applied to an intelligent terminal with a Low Noise Amplifier (LNA), and comprises the following steps:
dividing the fixed gain value under the low noise amplifier LNA supporting frequency band to obtain a plurality of preset gain intervals;
presetting a preset AGC (automatic gain control) control word corresponding to each preset gain interval, and generating a preset AGC control word group corresponding to each preset AGC control word;
after a receiving base station sends power, selecting a set number of the preset AGC control words to receive signals and respectively acquiring corresponding first received signal strength indication RSSI;
evaluating the plurality of first received signal strength indicator RSSI to match a target AGC control word corresponding to a target gain interval;
and adjusting the link gain by adopting the parameters of the target AGC control word group corresponding to the target AGC control word.
The method comprises the steps of classifying LNA gain values in advance to obtain a plurality of gain intervals, and generating and storing an AGC control word and an AGC control word group corresponding to each gain interval in advance; after the base station sends power, the adaptive AGC control word is judged and led in through the RSSI evaluation process, and the software can automatically complete the link gain adjustment, so that the aim of efficiently and accurately completing self-adaptive matching of LNAs (Low noise amplifiers) with different gears is fulfilled, the complex receiving link budget and the manual leading-in of the AGC control word are avoided, the adjustment efficiency is improved, the risk of software version management is reduced, and different product requirements of customers are met.
Preferably, the step of selecting the preset AGC control words of the set number for signal reception and respectively obtaining the corresponding first received signal strength indicators RSSI includes:
and sequentially selecting each preset AGC control word to receive signals and respectively calculating to obtain the corresponding first received signal strength indication RSSI.
And sequentially selecting M preset AGC control words to receive signals so as to obtain corresponding RSSI, and further determining the preset AGC control word corresponding to the RSSI closest to the optimal linear receiving power P0 of the radio frequency transceiving chip as a target AGC control word. In order to further improve the link gain adjustment precision, N preset AGC control words are sequentially selected for signal reception to finally obtain a target AGC control word, and the adjustment efficiency is ensured. Wherein, there are N preset gain intervals in total, M is less than or equal to N and M, N is a positive integer.
Preferably, the step of evaluating the plurality of first RSSI to match a target AGC control word corresponding to a target gain interval comprises:
calculating a first difference value between each first received signal strength indicator RSSI and the optimal linear receiving power of a radio frequency receiving and transmitting chip in the intelligent terminal;
and selecting the preset AGC control word corresponding to the minimum first difference value as the target AGC control word.
The software automatically judges the first received signal strength indication RSSI closest to the optimal linear received power P0 of the radio frequency transceiving chip to select the corresponding preset AGC control word, then the preset AGC control word corresponding to the preset AGC control word is imported, the adaptive AGC control word is judged and imported through the RSSI evaluation process, the software can automatically complete the link gain adjustment, and therefore the purpose of efficiently and accurately completing the self-adaptive matching of the LNAs with different gears is achieved. From the perspective of the rf transceiver chip, it can be considered that LNAs in the same gain interval can match the same set of AGC control words.
Preferably, the step of dividing the fixed gain value in the frequency band supported by the low noise amplifier LNA to obtain a plurality of preset gain intervals includes:
and classifying the fixed gain values under the low noise amplifier LNA supporting frequency band by adopting the set gain as stepping so as to obtain a plurality of preset gain intervals.
The preset gain interval can be obtained by classifying the fixed gain value of the LNA as a step based on inconsistent gain, such as 9-12dB, 12-14dB, 14-18dB and the like; in order to improve the efficiency of gain adjustment of a receiving link, the same gain is used as a step to classify the fixed gain value of the LNA to obtain a plurality of gain intervals, such as 9-12dB, 12-15dB, 15-18dB, and the like, that is, 3dB is used as a grade to classify the fixed gain value into a G grade, a G +3dB grade, a G +6dB grade, …, a G + (N-1) × 3dB grade, and N grades (that is, N gain intervals) in total, wherein each grade has a corresponding AGC control word and an AGC control word group.
Preferably, there is an overlap between two adjacent preset gain intervals.
The gain intervals are overlapped to ensure that each gain interval is completely covered by setting certain overlap between the gain intervals, so that the integral gain adjustment efficiency is ensured.
Preferably, the step of predetermining the preset AGC control word corresponding to each of the preset gain intervals includes:
after the instrument issues power to a receiving port of a radio frequency transceiving chip of the intelligent terminal, sequentially acquiring initial AGC control words of each preset gain interval;
calculating to obtain a second Received Signal Strength Indication (RSSI) of the corresponding preset gain interval according to the initial AGC control word;
calculating a second difference value between the second received signal strength indicator RSSI and the optimal linear receiving power of the radio frequency transceiving chip;
when the absolute value of the second difference is smaller than or equal to a set threshold, determining the initial AGC control word as the preset AGC control word corresponding to the preset gain interval;
and when the absolute value of the second difference is greater than the set threshold, adjusting the initial AGC control word until the absolute value of the second difference is less than or equal to the set threshold, and taking the adjusted initial AGC control word as the preset AGC control word corresponding to the preset gain interval.
The AGC control words and the corresponding AGC control word groups of each preset gain interval are predetermined and stored by the power sent by an instrument (signal source sending equipment), so that when the power is sent by an actual base station, the corresponding AGC control word groups are automatically adapted in time to automatically complete the gain adjustment of a receiving link.
The invention also provides a system for adjusting the gain of a receiving link, which is applied to an intelligent terminal with a Low Noise Amplifier (LNA), and comprises:
the gain interval acquisition module is used for dividing the fixed gain value under the frequency band supported by the LNA to acquire a plurality of preset gain intervals;
the pre-generation module is used for pre-determining a preset AGC control word corresponding to each preset gain interval and generating a preset AGC control word group corresponding to each preset AGC control word;
the RSSI acquisition module is used for selecting the preset AGC control words with set quantity to receive signals and respectively acquiring corresponding first received signal strength indication RSSI after receiving power sent by a base station;
a target control word acquisition module, configured to evaluate the multiple first RSSI to match a target AGC control word corresponding to a target gain interval;
and the adjusting module is used for adjusting the link gain by adopting the parameters of the target AGC control word group corresponding to the target AGC control word.
Preferably, the RSSI obtaining module is configured to sequentially select each of the preset AGC control words for signal reception and respectively calculate to obtain the corresponding first received signal strength indication RSSI.
Preferably, the target control word obtaining module includes:
the first calculation unit is used for calculating a first difference value between each first received signal strength indicator RSSI and the optimal linear receiving power of a radio frequency transceiver chip in the intelligent terminal;
and the selecting unit is used for selecting the preset AGC control word corresponding to the minimum first difference value as the target AGC control word.
Preferably, the gain interval obtaining module is configured to classify a fixed gain value in a frequency band supported by the LNA by using a set gain as a step to obtain a plurality of preset gain intervals.
Preferably, there is an overlap between two adjacent preset gain intervals.
Preferably, the pre-generation module includes:
the initial control word acquisition unit is used for sequentially acquiring the initial AGC control word of each preset gain interval after the instrument issues power to a receiving port of a radio frequency transceiver chip of the intelligent terminal;
the RSSI acquisition unit is used for calculating and obtaining a second received signal strength indication RSSI of the corresponding preset gain interval according to the initial AGC control word;
a second calculating unit, configured to calculate a second difference between the second RSSI and the optimal linear received power of the rf transceiver chip;
a preset control word determining unit, configured to determine, when the absolute value of the second difference is smaller than or equal to a set threshold, that the initial AGC control word is the preset AGC control word corresponding to the preset gain interval;
the preset control word determining unit is further configured to, when the absolute value of the second difference is greater than the set threshold, adjust the initial AGC control word until the absolute value of the second difference is smaller than or equal to the set threshold, and use the adjusted initial AGC control word as the preset AGC control word corresponding to the preset gain interval.
The invention also provides an intelligent terminal which comprises the system for adjusting the receiving link gain.
The positive progress effects of the invention are as follows:
(1) classifying LNA gain values in advance to obtain a plurality of gain intervals, and generating and storing AGC control words and AGC control word groups corresponding to each gain interval in advance; after the base station sends power, the adaptive AGC control word group is judged and introduced through the RSSI evaluation process, and the software can automatically complete the link gain adjustment, so that the adjustment efficiency is improved; in the RSSI evaluation process, AGC control words prestored in software play a role in sample guidance, so that a receiving system calls adaptive AGC control word groups, and the complex receiving link budget and manual introduction of the AGC control word groups are avoided, thereby realizing the purpose of efficiently and accurately completing self-adaptive matching of LNAs of different gears; (2) when a customer changes LNA of other models, the receiving gain adjustment of the new LNA can be completed by re-running the AGC calibration flow, so that the receiving performance is ensured and the robustness of a receiving link is improved; (3) aiming at different customers, the software can be matched with LNA of various models in a self-adaptive manner, so that the management risk of software versions is reduced, and flexible and variable customer requirements are met.
Drawings
Fig. 1 is a first flowchart of a method for adjusting a gain of a receiving link according to embodiment 1 of the present invention.
Fig. 2 is a second flowchart of a method for adjusting a gain of a receiving link according to embodiment 1 of the present invention.
Fig. 3 is a schematic diagram illustrating a correspondence relationship between LNA and instrument down-power and AGC control words in the method for adjusting receive link gain according to embodiment 1 of the present invention.
Fig. 4 is a schematic diagram illustrating a corresponding relationship between an LNA gain, an AGC control word and an AGC control word set thereof in the method for adjusting a receive link gain according to embodiment 1 of the present invention.
Fig. 5 is a block diagram of a system for adjusting a gain of a receiving link according to embodiment 2 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
The method for adjusting the gain of the receiving link according to the embodiment is applied to an intelligent terminal (such as a mobile phone) with a low noise amplifier LNA.
In this embodiment, before the adjustment method for the gain of the receiving link starts, AGC initialization needs to be performed first, then an LNA flag bit is obtained, if the LNA flag bit is "no", it is characterized that a low noise amplifier LNA is not set in the current intelligent device, and the current normal AGC calibration flow is performed according to the current normal AGC calibration flow until the calibration is completed, and therefore the current normal AGC calibration flow belongs to a mature technology in the field, and is not described herein again. If the LNA flag bit is "yes," it indicates that the current smart device has a low noise amplifier LNA, and then it is determined to perform the method for adjusting the receive link gain according to the embodiment.
As shown in fig. 1 and fig. 2, the method for adjusting the receive link gain of the present embodiment includes:
s101, dividing a fixed gain value under a low noise amplifier LNA (low noise amplifier) supporting frequency band to obtain a plurality of preset gain intervals;
specifically, step S101 includes:
and S1011, classifying the fixed gain values under the low noise amplifier LNA supporting frequency band by adopting the set gain as stepping so as to obtain a plurality of preset gain intervals.
In an intelligent terminal such as a mobile phone, a fixed gain LNA is generally used, that is, a device manual specifies a frequency band supported by the LNA and a fixed gain value in the frequency band.
The preset gain interval may be obtained by classifying the fixed gain value of the LNA as a step based on the inconsistent gain, for example, 9-12dB, 12-14dB, 14-18dB, and the like.
In order to improve the efficiency of gain adjustment of the receiving link, the same gain is used as a step to classify the fixed gain value of the LNA to obtain a plurality of gain intervals, for example, 9-12dB, 12-15dB, 15-18dB, and the like, that is, 3dB is classified as one level, and the gain intervals are divided into a G level (LNA1), a G +3dB level (LNA2), a G +6dB level (LNA3), a …, a G + (N-1) × 3dB Level (LNAN), and N levels (that is, N gain intervals), and each level has a corresponding AGC control word and an AGC control word group.
Wherein, there is the overlap between two adjacent preset gain intervals. The gain intervals are overlapped to ensure that each gain interval is completely covered by setting certain overlap between the gain intervals, so that the integral gain adjustment efficiency is ensured.
S102, predetermining a preset AGC control word corresponding to each preset gain interval, and generating a preset AGC control word group corresponding to each preset AGC control word;
specifically, step S102 includes:
s1021, after the instrument issues power to a receiving port of a radio frequency transceiver chip of the intelligent terminal, sequentially acquiring an initial AGC control word of each preset gain interval;
s1022, calculating to obtain a second received signal strength indication RSSI of a corresponding preset gain interval according to the initial AGC control word;
s1023, calculating a second difference value between the second received signal strength indication RSSI and the optimal linear receiving power of the radio frequency transceiver chip;
s1024, judging whether the absolute value of the second difference value is smaller than or equal to a set threshold value, if so, executing a step S1025; if not, go to step S1026;
s1025, determining the current AGC control word as a preset AGC control word corresponding to a preset gain interval;
s1026, adjusting the initial AGC control word, calculating to obtain a new second RSSI of the preset gain interval according to the adjusted initial AGC control word, and re-executing step S1023.
As shown in fig. 3, taking LNA1 as an example, sending power P to a receiving port of a radio frequency transceiver chip through an instrument (signal source sending device), introducing software into an initial AGC control word 1 of a G-stage corresponding to LNA1 and calculating to obtain RSSI, comparing the RSSI with optimal linear receiving power P0 of an ADC inside the radio frequency transceiver chip, and if an absolute value of a difference between the two is less than or equal to a set error Δ P, determining and recording that the current AGC control word 1 is a preset AGC control word 1 of the G-stage corresponding to LNA 1; and if the absolute value of the difference value of the two AGC control words is greater than delta P, adjusting the initial AGC control word, comparing the calculated new RSSI with P0 until the absolute value of the difference value of the two RSSI and the P0 is within the delta P, and determining and recording the final AGC control word to be adjusted as a preset AGC control word 1 of the G gear corresponding to the LNA 1.
Similarly, based on the determination process of the AGC control word, the initial AGC control words 1,2,3 … N corresponding to other gears LNA prestored in software may be obtained in sequence, and the corresponding relationship between each gear LNA and the power issued by the instrument is as shown in fig. 3, so as to generate the parameters of the AGC control word group corresponding to each gear LNA.
After the instrument issues power P, the AGC control words of each preset gain interval (LNA1, LNA2, … and LNAN) are sequentially determined and parameters of AGC control word groups corresponding to all gears LNA are generated, then the AGC control words corresponding to all gears LNA and the AGC control word groups thereof are respectively pre-stored, so that when the actual base station issues power, the corresponding AGC control word groups can be timely and automatically adapted to automatically complete gain adjustment of a receiving link.
The RSSI is obtained by the following method:
for a wireless communication system, a base station sends power to an intelligent terminal, the intelligent terminal receives signals through an antenna, the signals are subjected to gating, filtering, amplifying and other operations through a receiving link, then the signals are received and demodulated through a radio frequency transceiver chip, and the signals are converted into digital signals through an ADC (analog to digital converter) and transmitted to a baseband chip for further processing. Generally, a base station issues power P, a receiving link from an antenna to a port of an rf transceiver chip cascades gain G1, gain G2 corresponding to an AGC control word in the rf transceiver chip, and RSSI of a signal power finally received by the rf transceiver chip is P + G1+ G2.
Similarly, in this embodiment, after the intelligent terminal receiving instrument issues the power P, the RSSI 1,2, and 3 … N corresponding to each gear (LNA1, LNA2, …, and LNAN) is respectively calculated and recorded by the above method.
S103, after receiving power sent by a base station, selecting a preset AGC control word with a set number for signal receiving and respectively acquiring corresponding first received signal strength indication RSSI;
specifically, step S103 includes:
and S1031, sequentially selecting each preset AGC control word to receive signals and respectively calculating to obtain corresponding first received signal strength indication RSSI.
Sequentially selecting M preset AGC control words to receive signals to obtain corresponding RSSI, and further determining the preset AGC control word corresponding to the RSSI closest to the optimal linear receiving power P0 of the radio frequency transceiving chip as a target AGC control word; wherein, there are N preset gain intervals in total, M is less than or equal to N and M, N is a positive integer.
In order to further improve the link gain adjustment precision, N preset AGC control words are sequentially selected for signal reception to finally obtain a target AGC control word, and the adjustment efficiency is ensured.
In this embodiment, after the intelligent terminal receives the power P issued by the base station, the preset AGC control words 1,2, and 3 … N are sequentially selected for signal reception, and the RSSI 1,2, and 3 … N are respectively calculated and recorded by using the above RSSI acquisition method.
S104, evaluating the plurality of first received signal strength indicator RSSI to match a target AGC control word corresponding to a target gain interval;
specifically, step S104 includes:
s1041, calculating a first difference value between each first received signal strength indicator RSSI and the optimal linear receiving power of a radio frequency receiving and transmitting chip in the intelligent terminal;
s1042, selecting the preset AGC control word corresponding to the minimum first difference value as a target AGC control word.
The software automatically judges the first received signal strength indication RSSI closest to the optimal linear received power P0 of the radio frequency transceiving chip to select the corresponding preset AGC control word, then the preset AGC control word corresponding to the preset AGC control word is imported, the adaptive AGC control word is judged and imported through the RSSI evaluation process, the software can automatically complete the link gain adjustment, thereby realizing the purpose of efficiently and accurately completing the self-adaptive matching of the LNAs at different gears, and improving the adjustment efficiency. From the perspective of the rf transceiver chip, it can be considered that LNAs in the same gain interval can match the same set of AGC control words.
And S105, adjusting the link gain by adopting the parameters of the target AGC control word group corresponding to the target AGC control word.
As shown in fig. 4, after the base station issues the power P, N preset AGC control words are sequentially selected for signal reception and RSSI 1,2,3 … N is obtained by calculation, the AGC control word corresponding to the RSSI closest to the optimal linear received power P0 of the radio frequency transceiver chip is obtained as a target AGC control word, and the parameters of the AGC control word are introduced into a final software version, and then the operation is performed according to a normal AGC calibration flow until the calibration is finished.
For example, when the RSSI3 is obtained after the AGC control word 3 is called, the software determines that the difference between the RSSI3 and the P0 is the minimum, then the LNA gain is selected to be in the G +6dB level, the AGC control word 3 is selected, and the parameters of the AGC control word group 3 are imported into the final software version. The AGC control word 3 is taken from the AGC control word group 3, is one of the samples of the control word group, and is pre-stored in the initialization software in advance, and plays a role of sample guidance for selecting the AGC control word group.
In addition, the parameters of the AGC control word group 3 can be imported into the final software version in the form of a differential file or the like, and it belongs to the mature technology in the art how to import the parameters of the AGC control word group into the software version by using the differential file, so that details are not described here. Of course, other ways of importing the parameters of the AGC control word into the software version may be used.
In the embodiment, LNA gain values are classified in advance to obtain a plurality of gain intervals, and an AGC control word group corresponding to each gain interval are generated and stored in advance; after the base station sends power, the adaptive AGC control word group is judged and introduced through the RSSI evaluation process, and the software can automatically complete the link gain adjustment, so that the adjustment efficiency is improved; in the RSSI evaluation process, AGC control words prestored in software play a role in sample guidance, so that a receiving system calls adaptive AGC control word groups, and the complex receiving link budget and manual introduction of the AGC control word groups are avoided, thereby realizing the purpose of efficiently and accurately completing self-adaptive matching of LNAs of different gears; when a customer changes LNA of other models, the receiving gain adjustment of the new LNA can be completed by re-running the AGC calibration flow, so that the receiving performance is ensured and the robustness of a receiving link is improved; aiming at different customers, the software can be matched with LNA of various models in a self-adaptive manner, so that the management risk of software versions is reduced, and flexible and variable customer requirements are met.
Example 2
The adjusting system of the receiving link gain of the embodiment is applied to the intelligent terminal with the low noise amplifier LNA.
In this embodiment, before the adjustment system for the gain of the receiving link starts working, AGC initialization needs to be performed first, then an LNA flag bit is obtained, if the LNA flag bit is "no", it is characterized that a low noise amplifier LNA is not set in the current intelligent device, and the current normal AGC calibration flow is performed according to the current normal AGC calibration flow until the calibration is completed, and therefore the current normal AGC calibration flow belongs to a mature technology in the field, and is not described herein again. If the LNA flag bit is "yes," it indicates that the current smart device has a low noise amplifier LNA, and it is determined that the adjustment system for the receive link gain of this embodiment is turned on.
As shown in fig. 5, the system for adjusting the receive link gain of this embodiment includes a gain interval obtaining module 1, a pre-generation module 2, an RSSI obtaining module 3, an object control word obtaining module 4, and an adjusting module 5.
The gain interval acquisition module 1 is configured to divide a fixed gain value in a frequency band supported by a low noise amplifier LNA to acquire a plurality of preset gain intervals;
specifically, the gain interval obtaining module 1 is configured to classify fixed gain values in a low noise amplifier LNA supported frequency band by setting a gain as a step to obtain a plurality of preset gain intervals.
In an intelligent terminal such as a mobile phone, a fixed gain LNA is generally used, that is, a device manual specifies a frequency band supported by the LNA and a fixed gain value in the frequency band.
The preset gain interval may be obtained by classifying the fixed gain value of the LNA as a step based on the inconsistent gain, for example, 9-12dB, 12-14dB, 14-18dB, and the like.
In order to improve the efficiency of gain adjustment of the receiving link, the same gain is used as a step to classify the fixed gain value of the LNA to obtain a plurality of gain intervals, for example, 9-12dB, 12-15dB, 15-18dB, and the like, that is, 3dB is classified as one level, and the gain intervals are divided into a G level (LNA1), a G +3dB level (LNA2), a G +6dB level (LNA3), a …, a G + (N-1) × 3dB Level (LNAN), and N levels (that is, N gain intervals), and each level has a corresponding AGC control word and an AGC control word group.
Wherein, there is the overlap between two adjacent preset gain intervals. The gain intervals are overlapped to ensure that each gain interval is completely covered by setting certain overlap between the gain intervals, so that the integral gain adjustment efficiency is ensured.
The pre-generation module 2 is used for pre-determining a preset AGC control word corresponding to each preset gain interval and generating a preset AGC control word group corresponding to each preset AGC control word;
specifically, the pre-generation module 2 includes an initial control word acquisition unit 6, an RSSI acquisition unit 7, a second calculation unit 8, and a preset control word determination unit 9.
The initial control word acquisition unit 6 is used for sequentially acquiring the initial AGC control words of each preset gain interval after the instrument issues power to a receiving port of a radio frequency transceiver chip of the intelligent terminal;
the RSSI acquisition unit 7 is used for calculating and obtaining a second received signal strength indication RSSI of the corresponding preset gain interval according to the initial AGC control word;
a second calculating unit 8, configured to calculate a second difference between the second RSSI and the optimal linear receiving power of the rf transceiver chip;
a preset control word determining unit 9, configured to determine, when the absolute value of the second difference is smaller than or equal to the set threshold, that the initial AGC control word is a preset AGC control word corresponding to the preset gain interval;
the preset control word determining unit 9 is further configured to, when the absolute value of the second difference is greater than the set threshold, adjust the initial AGC control word until the absolute value of the second difference is smaller than or equal to the set threshold, and use the adjusted initial AGC control word as the preset AGC control word corresponding to the preset gain interval.
As shown in fig. 3, taking LNA1 as an example, sending power P to a receiving port of a radio frequency transceiver chip through an instrument (signal source sending device), introducing software into an initial AGC control word 1 of a G-stage corresponding to LNA1 and calculating to obtain RSSI, comparing the RSSI with optimal linear receiving power P0 of an ADC inside the radio frequency transceiver chip, and if an absolute value of a difference between the two is less than or equal to a set error Δ P, determining and recording that the current AGC control word 1 is a preset AGC control word 1 of the G-stage corresponding to LNA 1; and if the absolute value of the difference value of the two is greater than delta P, adjusting an initial AGC control word, comparing the calculated new RSSI with P0 until the absolute value of the difference value of the two is within the delta P, and determining and recording the adjusted final AGC control word as a preset AGC control word 1 of the G gear corresponding to the LNA 1.
Similarly, based on the determination process of the AGC control word, the initial AGC control words 1,2,3 … N corresponding to other gears LNA prestored in software may be obtained in sequence, and the corresponding relationship between each gear LNA and the power issued by the instrument is as shown in fig. 3, so as to generate the parameters of the AGC control word group corresponding to each gear LNA.
After the instrument issues power P, the AGC control words of each preset gain interval (LNA1, LNA2, … and LNAN) are sequentially determined and parameters of AGC control word groups corresponding to all gears LNA are generated, then the AGC control words corresponding to all gears LNA and the AGC control word groups thereof are respectively pre-stored, so that when the actual base station issues power, the corresponding AGC control word groups can be timely and automatically adapted to automatically complete gain adjustment of a receiving link.
The RSSI is obtained by the following method:
for a wireless communication system, a base station sends power to an intelligent terminal, the intelligent terminal receives signals through an antenna, the signals are subjected to gating, filtering, amplifying and other operations through a receiving link, then the signals are received and demodulated through a radio frequency transceiver chip, and the signals are converted into digital signals through an ADC (analog to digital converter) and transmitted to a baseband chip for further processing. Generally, a base station issues power P, a receiving link from an antenna to a port of an rf transceiver chip cascades gain G1, gain G2 corresponding to an AGC control word in the rf transceiver chip, and RSSI of a signal power finally received by the rf transceiver chip is P + G1+ G2.
Similarly, in this embodiment, after the intelligent terminal receiving instrument issues the power P, the RSSI 1,2, and 3 … N corresponding to each gear (LNA1, LNA2, …, and LNAN) is respectively calculated and recorded by the above method.
The RSSI acquisition module 3 is used for selecting a preset AGC control word with a set number for signal reception and respectively acquiring corresponding first received signal strength indication RSSI after receiving power sent by a base station;
specifically, the RSSI acquisition module 3 is configured to sequentially select each preset AGC control word for signal reception and respectively calculate to obtain a corresponding first received signal strength indication RSSI.
Sequentially selecting M preset AGC control words to receive signals to obtain corresponding RSSI, and further determining the preset AGC control word corresponding to the RSSI closest to the optimal linear receiving power P0 of the radio frequency transceiving chip as a target AGC control word; wherein, there are N preset gain intervals in total, M is less than or equal to N and M, N is a positive integer.
In order to further improve the link gain adjustment precision, N preset AGC control words are sequentially selected for signal reception to finally obtain a target AGC control word, and the adjustment efficiency is ensured.
In this embodiment, after the intelligent terminal receives the power P issued by the base station, the preset AGC control words 1,2, and 3 … N are sequentially selected for signal reception, and the RSSI 1,2, and 3 … N are respectively calculated and recorded by using the above RSSI acquisition method.
The target control word acquisition module 4 is configured to evaluate the multiple first received signal strength indicators RSSI to match a target AGC control word corresponding to a target gain interval;
specifically, the target control word obtaining module 4 includes a first calculating unit 10 and a selecting unit 11.
The first calculating unit 10 is configured to calculate a first difference between each first received signal strength indicator RSSI and an optimal linear received power of a radio frequency transceiver chip in the intelligent terminal;
the selecting unit 11 is configured to select a preset AGC control word corresponding to the smallest first difference as a target AGC control word.
The software automatically judges the first received signal strength indication RSSI closest to the optimal linear received power P0 of the radio frequency transceiving chip to select the corresponding preset AGC control word, then the preset AGC control word corresponding to the preset AGC control word is imported, the adaptive AGC control word is judged and imported through the RSSI evaluation process, the software can automatically complete the link gain adjustment, thereby realizing the purpose of efficiently and accurately completing the self-adaptive matching of the LNAs at different gears, and improving the adjustment efficiency. From the perspective of the rf transceiver chip, it can be considered that LNAs in the same gain interval can match the same set of AGC control words.
The adjusting module 5 is configured to perform link gain adjustment by using parameters of a target AGC control word group corresponding to the target AGC control word.
As shown in fig. 4, after the base station issues the power P, N preset AGC control words are sequentially selected for signal reception and RSSI 1,2,3 … N is obtained by calculation, the AGC control word corresponding to the RSSI closest to the optimal linear received power P0 of the radio frequency transceiver chip is obtained as a target AGC control word, and the parameters of the AGC control word are introduced into a final software version, and then the operation is performed according to a normal AGC calibration flow until the calibration is finished.
For example, when the RSSI3 is obtained after the AGC control word 3 is called, and the software determines that the difference between the RSSI3 and the P0 is minimum, the LNA gain is selected to be in the G +6dB stage, the AGC control word 3 is selected, and the parameter of the AGC control word group 3 is introduced into the final software version. The AGC control word 3 is taken from the AGC control word group 3, is one of the samples of the control word group, and is pre-stored in the initialization software in advance, and plays a role of sample guidance for selecting the AGC control word group.
In addition, the parameters of the AGC control word group 3 can be imported into the final software version in the form of a differential file or the like, and it belongs to the mature technology in the art how to import the parameters of the AGC control word group into the software version by using the differential file, so that details are not described here. Of course, other ways of importing the parameters of the AGC control word into the software version may be used.
In the embodiment, LNA gain values are classified in advance to obtain a plurality of gain intervals, and an AGC control word group corresponding to each gain interval are generated and stored in advance; after the base station transmits power, the adaptive AGC control word group is judged and introduced through the RSSI evaluation process, and the software can automatically complete the link gain adjustment, so that the adjustment efficiency is improved; in the RSSI evaluation process, AGC control words prestored in software play a role in sample guidance, so that a receiving system calls adaptive AGC control word groups, and the complex receiving link budget and manual introduction of the AGC control word groups are avoided, thereby realizing the purpose of efficiently and accurately completing self-adaptive matching of LNAs of different gears; when a customer changes LNA of other models, the receiving gain adjustment of the new LNA can be completed by re-running the AGC calibration flow, so that the receiving performance is ensured and the robustness of a receiving link is improved; aiming at different customers, the software can be matched with LNA of various models in a self-adaptive manner, so that the management risk of software versions is reduced, and flexible and variable customer requirements are met.
Example 3
The intelligent terminal of this embodiment includes the adjustment system of the receive link gain in embodiment 2.
The intelligent terminal in the embodiment comprises the adjusting system, so that when the gain of the receiving link is adjusted, the adaptive AGC control word group is judged and introduced through the RSSI evaluation process, the software can automatically complete the adjustment of the gain of the link, and the tedious budget of the receiving link and the manual introduction of the AGC control word group are avoided, so that the aim of efficiently and accurately completing the self-adaptive matching of LNAs (Low noise amplifiers) with different gears is fulfilled, and the adjusting efficiency is improved; when a customer changes LNA of other models, the receiving gain adjustment of the new LNA can be completed by re-running the AGC calibration flow, so that the receiving performance is ensured and the robustness of a receiving link is improved; aiming at different customers, the software can be matched with various models of LNAs in a self-adaptive manner, the management risk of software versions is reduced, the flexible and changeable customer requirements are met, and therefore the overall product performance of the intelligent terminal is improved.
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. A method for adjusting the gain of a receiving link, which is applied in an intelligent terminal with a Low Noise Amplifier (LNA), comprises:
dividing the fixed gain value under the low noise amplifier LNA supporting frequency band to obtain a plurality of preset gain intervals;
presetting a preset AGC control word corresponding to each preset gain interval, and generating a preset AGC control word group corresponding to each preset AGC control word;
after receiving power issued by a base station, selecting a set number of the preset AGC control words to receive signals and respectively acquiring corresponding first received signal strength indication RSSI;
evaluating the plurality of first received signal strength indicator RSSI to match a target AGC control word corresponding to a target gain interval;
and adjusting the link gain by adopting the parameters of the target AGC control word group corresponding to the target AGC control word.
2. The method for adjusting gain of a receiving link according to claim 1, wherein the step of selecting a predetermined number of the predetermined AGC control words for signal reception and respectively obtaining corresponding first RSSI values comprises:
and sequentially selecting each preset AGC control word to receive signals and respectively calculating to obtain the corresponding first received signal strength indication RSSI.
3. The method of claim 1 or 2, wherein the step of evaluating a plurality of the first RSSI to match a target AGC control word corresponding to a target gain interval comprises:
calculating a first difference value between each first received signal strength indicator RSSI and the optimal linear receiving power of a radio frequency receiving and transmitting chip in the intelligent terminal;
and selecting the preset AGC control word corresponding to the minimum first difference value as the target AGC control word.
4. The method for adjusting gain of a receiving link according to claim 1, wherein the step of dividing the fixed gain value in the frequency band supported by the low noise amplifier LNA to obtain a plurality of preset gain intervals comprises:
and classifying the fixed gain values under the low noise amplifier LNA supporting frequency band by adopting the set gain as stepping so as to obtain a plurality of preset gain intervals.
5. The method for adjusting gain of receiving chain as claimed in claim 1 or 4, wherein there is an overlap between two adjacent preset gain intervals.
6. The method for adjusting gain of a receiving link according to claim 1, wherein the step of predetermining the predetermined AGC control word corresponding to each of the predetermined gain intervals comprises:
after an instrument issues power to a receiving port of a radio frequency transceiver chip of the intelligent terminal, sequentially acquiring an initial AGC control word of each preset gain interval;
calculating to obtain a second received signal strength indication RSSI of the corresponding preset gain interval according to the initial AGC control word;
calculating a second difference value between the second received signal strength indicator RSSI and the optimal linear receiving power of the radio frequency transceiving chip;
when the absolute value of the second difference is smaller than or equal to a set threshold, determining the initial AGC control word as the preset AGC control word corresponding to the preset gain interval;
and when the absolute value of the second difference is greater than the set threshold, adjusting the initial AGC control word until the absolute value of the second difference is less than or equal to the set threshold, and taking the adjusted initial AGC control word as the preset AGC control word corresponding to the preset gain interval.
7. An adjustment system for gain of a receiving link, the adjustment system being applied in an intelligent terminal with a Low Noise Amplifier (LNA), the adjustment system comprising:
the gain interval acquisition module is used for dividing the fixed gain value under the frequency band supported by the LNA to acquire a plurality of preset gain intervals;
the pre-generation module is used for pre-determining a preset AGC control word corresponding to each preset gain interval and generating a preset AGC control word group corresponding to each preset AGC control word;
the RSSI acquisition module is used for selecting the preset AGC control words with set quantity to receive signals and respectively acquiring corresponding first received signal strength indication RSSI after receiving power sent by a base station;
a target control word acquisition module, configured to evaluate the multiple first RSSI to match a target AGC control word corresponding to a target gain interval;
and the adjusting module is used for adjusting the link gain by adopting the parameters of the target AGC control word group corresponding to the target AGC control word.
8. The system for adjusting gain of a receiving link according to claim 7, wherein the RSSI acquisition module is configured to sequentially select each of the predetermined AGC control words for signal reception and respectively calculate a corresponding RSSI for the first received signal strength indication.
9. The system for adjusting gain of a receiving link according to claim 7 or 8, wherein the target control word obtaining module comprises:
the first calculation unit is used for calculating a first difference value between each first received signal strength indicator RSSI and the optimal linear receiving power of a radio frequency transceiver chip in the intelligent terminal;
and the selecting unit is used for selecting the preset AGC control word corresponding to the minimum first difference value as the target AGC control word.
10. The system for adjusting gain of a receiving link according to claim 7, wherein the gain interval obtaining module is configured to classify the fixed gain values in the LNA supported frequency band by using the set gain as a step to obtain a plurality of the preset gain intervals.
11. The system for adjusting gain of a receiving chain according to claim 7 or 10, wherein there is an overlap between two adjacent preset gain intervals.
12. The receive chain gain adjustment system of claim 7, wherein the pre-generation module comprises:
the initial control word acquisition unit is used for sequentially acquiring the initial AGC control word of each preset gain interval after the instrument issues power to a receiving port of a radio frequency transceiver chip of the intelligent terminal;
the RSSI acquisition unit is used for calculating and obtaining a second received signal strength indication RSSI of the corresponding preset gain interval according to the initial AGC control word;
a second calculating unit, configured to calculate a second difference between the second RSSI and the optimal linear received power of the rf transceiver chip;
a preset control word determining unit, configured to determine, when the absolute value of the second difference is smaller than or equal to a set threshold, that the initial AGC control word is the preset AGC control word corresponding to the preset gain interval;
the preset control word determining unit is further configured to, when the absolute value of the second difference is greater than the set threshold, adjust the initial AGC control word until the absolute value of the second difference is smaller than or equal to the set threshold, and use the adjusted initial AGC control word as the preset AGC control word corresponding to the preset gain interval.
13. An intelligent terminal, characterized in that the intelligent terminal comprises the system for adjusting the gain of the receiving link according to any one of claims 7 to 12.
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| CN119316919B (en) * | 2024-12-18 | 2025-04-18 | 南京沁恒微电子股份有限公司 | Multi-parameter joint adaptive power control method for short-range wireless IoT chips |
| CN119997184B (en) * | 2025-04-09 | 2025-06-20 | 四川创智联恒科技有限公司 | Gain control method, program product, electronic equipment and storage medium of base station receiving link |
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