CN116455418A - System and method for fast AGC - Google Patents
System and method for fast AGC Download PDFInfo
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- CN116455418A CN116455418A CN202310082945.1A CN202310082945A CN116455418A CN 116455418 A CN116455418 A CN 116455418A CN 202310082945 A CN202310082945 A CN 202310082945A CN 116455418 A CN116455418 A CN 116455418A
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- 238000001514 detection method Methods 0.000 claims abstract description 18
- 238000005070 sampling Methods 0.000 claims description 2
- 230000004044 response Effects 0.000 abstract description 4
- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
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- 230000003321 amplification Effects 0.000 description 1
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- 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
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a system and a method for quick AGC, comprising an AGC controller; the AGC controller is provided with a plurality of input ends and a plurality of gain control transmitting ends, each input end is connected with an RX channel output end, an ADC module and a digital detection module are sequentially connected between the RX channel output end and the AGC controller input end, the RX channel is provided with a gain control receiving end, and the gain control receiving end is connected with the gain control transmitting ends in a one-to-one correspondence manner. The AGC response time is fast, a detection channel, a corresponding ADC and a digital circuit are not needed, the circuit is simple, and the cost is low by utilizing the receiving channel of the existing multi-antenna system.
Description
Technical Field
The invention belongs to the field of radio waves, and relates to a system and a method for quick AGC.
Background
Because of the diversity of propagation spaces, the input signal of a radio receiver has different signal amplitude characteristics at different locations and times. The analog link gain of the receiver needs to be adjusted in real time with the size of the input signal so that the digital signal size is in the optimum signal amplitude range, which is the meaning of AGC automatic gain control.
The existing AGC method is realized in two modes:
1) Successive adjustment method. That is, after the signal is input, when the circuit detects that the signal amplitude is too large, a certain gain is reduced, and otherwise, the certain gain is increased. After each gain adjustment, the amplitude of the input signal is redetected and adjusted successively until the signal amplitude meets the desired requirement.
2) Detecting by a detector. The input radio frequency signal is coupled with a part of the input radio frequency signal through an analog link channel and a digital link channel and is sent to a detector for detection, namely, the signal power is converted into voltage, then the voltage value is read through an ADC circuit, the signal power is converted in a digital domain, and finally, the link gain value is directly determined once according to the current signal power, so that the adjusted signal amplitude just meets the expected requirement.
However, the successive adjustment method has the problem of slow adjustment response time because of multiple adjustments, and for increasingly scarce wireless time-frequency resources, the effective utilization of the frequency spectrum is seriously affected by the excessively long AGC adjustment time; the detector method, while capable of fast convergence adjustment, requires additional analog detection channels, and corresponding ADC and digital circuitry, which is highly complex and costly to manufacture and maintain.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a system and a method for quick AGC, which have the advantages of quick AGC response time, no need of detection channels and corresponding ADC and digital circuits, simple circuit, low cost by utilizing the receiving channels of the existing multi-antenna system.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
a system for fast AGC comprising an AGC controller;
the AGC controller is provided with a plurality of input ends and a plurality of gain control transmitting ends, each input end is connected with an RX channel output end, an ADC module and a digital detection module are sequentially connected between the RX channel output end and the AGC controller input end, the RX channel is provided with a gain control receiving end, and the gain control receiving end is connected with the gain control transmitting ends in a one-to-one correspondence manner.
Preferably, each RX channel is provided with an independent gain adjustment circuit.
Preferably, the input end of each RX channel is connected to an antenna.
Preferably, the RX channel includes a front end and a plurality of rear ends, each ADC module and the gain control transmitting end are correspondingly connected to a rear end of the RX channel, the rear end input ends of the plurality of RX channels are commonly connected to a front end output end of the RX channel, and the front end input end of the RX channel is connected to an antenna.
A method of fast AGC for a system comprising the steps of:
s1: the AGC controller sets the gain of each RX channel to different gain values, so that the gain of each channel is in different gears;
s2: after receiving signals through RX channels with different gains, sampling by an ADC module, and sending digital signals to a digital detection module, wherein the digital detection module calculates the power value of each RX channel;
s3: the AGC controller obtains a correct AGC gain configuration result after comprehensive processing according to the power value of each RX channel, and controls the corresponding RX channel gain;
s4: the AGC ends and the system enters normal signal reception mode.
Preferably, the RX channel gain setting rule of S1 is as follows, assuming that the RX channel maximum gain is G max The dynamic range of the input radio frequency signal is R (dB), there are M RX channels, and the initial gain G of RX channel M (m=1, 2, …, M) m The method comprises the following steps:
preferably, the process of the AGC controller of S3 obtaining the correct AGC gain configuration result is: let the power of the mth receive channel digital signal be P m (dBFS) the upper threshold for digital demodulation power is P H (dBFS) the lower threshold of digital demodulation power is P L (dBFS)，Recording the correct AGC gain as G, comparing P in turn m And P H P L In two cases, if P H >P m >P L Then g=g m +P H -P m The method comprises the steps of carrying out a first treatment on the surface of the If none of P m Satisfy P H >P m >P L . Without loss of generality, assume the digital signal power P of the kth and k+1 paths k And P k+1 The method meets the following conditions: p (P) k >P H >P L >P k+1 Then g= (G) k+1 +G k )/2。
Preferably, prior to S1, the AGC controller is instructed by the transmit receive switch T/R signal to enter a receive mode.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, by setting a multi-path RX channel architecture, different gains are set firstly, and then a correct AGC gain configuration result is obtained according to the power value, so that compared with the conventional successive adjustment method, iteration is not needed, and the AGC response time is fast; compared with the existing detector detection method, the method does not need a detection channel, a corresponding ADC and a digital circuit, has simple circuit, can utilize the RX channel of the existing multi-antenna system, and has low cost.
Drawings
Fig. 1 is a system block diagram of a fast AGC of the present invention;
FIG. 2 is a timing diagram of gain variation for each RX channel according to the present invention;
fig. 3 is a block diagram of a single antenna system of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention; all other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of a particular component.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, the fast AGC apparatus according to the present invention includes multiple RX channels and an AGC controller.
The AGC controller is provided with a plurality of input ends and a plurality of gain control transmitting ends, each input end is connected with an RX channel output end, an ADC module and a digital detection module are sequentially connected between the RX channel output end and the AGC controller input end, the RX channel is provided with a gain control receiving end, and the gain control receiving end is connected with the gain control transmitting ends in a one-to-one correspondence manner. The input end of each RX channel is respectively connected with an antenna.
Each RX channel is provided with an independently adjustable gain adjustment (i.e., amplification and or attenuation) circuit.
The ADC module samples the analog signal into a digital signal.
The digital detection module is used for calculating the power or amplitude of an input digital signal, and the digital detection module and the AGC controller are digital processing parts of the system.
The AGC controller is responsible for the control of the whole AGC flow, gain calculation and feedback control output, and is connected with a receiving and transmitting switch T/R.
The working flow of the whole system is as follows:
s1: after the AGC controller is instructed by a T/R signal of the receiving and transmitting switch to enter a receiving mode, the AGC controller firstly sets the gain of each RX channel to different gain values, namely, adjusts the gain/attenuation of each RX channel, so that the gain of each RX channel is in different gears.
S2: the antenna receives signals, the signals pass through RX channels with different gains, the ADC samples the signals, the digital signals are sent to a digital detection module in the digital processing part, and the digital detection module calculates the power value of each RX channel.
S3: and the AGC controller obtains a correct AGC gain configuration result (namely the gain of the radio frequency link) after comprehensive processing according to the power value result of each RX channel, and controls the corresponding RX channel gain.
S4: the AGC ends and the system enters normal signal reception mode.
In the AGC adjustment process, a gain change timing diagram of each RX channel is shown in fig. 2.
The RX channel gain setting rule for S1 is as follows, assuming that the RX channel maximum gain is G max The dynamic range of the input radio frequency signal is R (dB), there are M RX channels, and the initial gain G of RX channel M (m=1, 2, …, M) m The method comprises the following steps:
the process of the AGC controller of S3 obtaining the correct AGC gain configuration result is: let the power of the mth receive channel digital signal be P m (dBFS) the upper threshold for digital demodulation power is P H (dBFS) the lower threshold of digital demodulation power is P L (dBFS), record correct AGC gain as G, compare P in turn m And P H P L In two cases, if P H >P m >P L Then g=g m +P H -P m The method comprises the steps of carrying out a first treatment on the surface of the If none of P m Satisfy P H >P m >P L . Without loss of generality, assume the digital signal power P of the kth and k+1 paths k And P k+1 The method meets the following conditions: p (P) k >P H >P L >P k+1 Then g= (G) k+1 +G k )/2。
As shown in fig. 3, another embodiment is disclosed, where the RX channel includes a front end and a plurality of rear ends, each ADC module and the gain control transmitting end are correspondingly connected to a rear end of the RX channel, the plurality of rear end inputs of the RX channel are commonly connected to a front end output of the RX channel, and the front end input of the RX channel is connected to an antenna.
That is, when the single antenna enters the multi-path RX channels except the front end amplifying circuit, the rear end of each RX channel is provided with different gains.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the patent should, therefore, be determined not with reference to the above description, but instead should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are incorporated herein by reference for the purpose of completeness. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to forego such subject matter, nor should the applicant not be considered to be a part of the disclosed subject matter.
Claims (8)
1. A system for fast AGC comprising an AGC controller;
the AGC controller is provided with a plurality of input ends and a plurality of gain control transmitting ends, each input end is connected with an RX channel output end, an ADC module and a digital detection module are sequentially connected between the RX channel output end and the AGC controller input end, the RX channel is provided with a gain control receiving end, and the gain control receiving end is connected with the gain control transmitting ends in a one-to-one correspondence manner.
2. The fast AGC system of claim 1, wherein each RX path is provided with an independent gain adjustment circuit.
3. The fast AGC system of claim 1, wherein an antenna is coupled to each input of each RX path.
4. The fast AGC system of claim 1 wherein the RX path includes a front end and a plurality of back ends, each ADC module and gain control transmit end being correspondingly coupled to a back end of the RX path, the plurality of RX path back end inputs being commonly coupled to a RX path front end output, the RX path front end input being coupled to an antenna.
5. A fast AGC method based on a system according to any one of claims 1-4, comprising the steps of:
s1: the AGC controller sets the gain of each RX channel to different gain values, so that the gain of each channel is in different gears;
s2: after receiving signals through RX channels with different gains, sampling by an ADC module, and sending digital signals to a digital detection module, wherein the digital detection module calculates the power value of each RX channel;
s3: the AGC controller obtains a correct AGC gain configuration result after comprehensive processing according to the power value of each RX channel, and controls the corresponding RX channel gain;
s4: the AGC ends and the system enters normal signal reception mode.
6. The fast AGC method of claim 5 wherein the RX channel gain setting rule for S1 is as follows assuming an RX channel maximum gain of G max The dynamic range of the input radio frequency signal is R,in dB, there are M RX channels, then the initial gain G of RX channel M m The method comprises the following steps:
where m=1, 2, …, M.
7. The fast AGC method of claim 5 wherein the step of the AGC controller of S3 obtaining the correct AGC gain configuration result is: let the power of the mth receive channel digital signal be P m The unit is dBFS, and the upper threshold of digital demodulation power is P H The unit is dBFS, the lower threshold of digital demodulation power is P L The unit is dBFS, the correct AGC gain is recorded as G, and P is compared in turn m And P H P L In two cases, if P H >P m >P L Then g=g m +P H -P m The method comprises the steps of carrying out a first treatment on the surface of the If none of P m Satisfy P H >P m >P L Without loss of generality, assume the digital signal power P of the kth and k+1 paths k And P k+1 The method meets the following conditions: p (P) k >P H >P L >P k+1 Then g= (G) k+1 +G k )/2。
8. The fast AGC method of claim 5 wherein prior to S1, the AGC controller is instructed by a transmit receive switch T/R signal to enter a receive mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202310082945.1A CN116455418A (en) | 2023-01-31 | 2023-01-31 | System and method for fast AGC |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310082945.1A CN116455418A (en) | 2023-01-31 | 2023-01-31 | System and method for fast AGC |
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| CN116455418A true CN116455418A (en) | 2023-07-18 |
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| CN202310082945.1A Pending CN116455418A (en) | 2023-01-31 | 2023-01-31 | System and method for fast AGC |
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