CN101123595A - A method and system for gain calibration of digital receiver channel - Google Patents
A method and system for gain calibration of digital receiver channel Download PDFInfo
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Abstract
The invention provides a method and a system for digital receiver channel gain calibration. The method comprises that step one, a calibrating digital receiver sets up a communication connection with a control mainframe after the opening of the receiver; step two, the digital receiver and the received calibration signals carry out an initial synchronization, and the control mainframe and the digital receiver carry out an initial channel gain alignment after the completion of the initial synchronization; step three, the control mainframe forecasts a control word step size, and determines a corresponding channel gain of the control word step size; step four, the control mainframe establishes a channel gain calibration table according to the recorded control word step size and the channel gain. With the art, the invention supports a simultaneous calibration of a plurality of receivers, which decreases calibration time of receivers and suits for a mass production of receivers. And due to a dynamic forecast for a channel gain control coefficient, the calibration speed is improved, the effect of thermal noise and noise coefficient of the receiver at a higher channel gain is eliminated, and the calibration precision is enhanced.
Description
Technical Field
The present invention relates to receiver calibration techniques, and more particularly, to a method and system for calibrating channel gain of a digital receiver.
Background
Fig. 1 is a schematic structural diagram of a conventional digital receiver, where an input signal enters the receiver from an input port, passes through a Surface Acoustic Wave Filter (saw), then reaches a Low Noise Amplifier (LNA), and is multiplied by a local oscillator signal in a mixer to output a baseband signal, which is amplified by a Variable Gain Amplifier (VGA) and then sent to a sampling circuit, and a digital signal obtained after sampling enters a digital baseband to perform a subsequent digital signal processing process. Because the amplitude of the input signal changes with the changes of factors such as application occasions, transmission environments, time and the like, the amplitude of the digital signal sampled in the digital baseband also changes correspondingly; for the receiver itself, the amplitude of the digital signal in the digital baseband is also affected by the changes of the operating conditions, the operating temperature and other factors.
Conventional digital receiver calibration systems generally focus on calibrating the relationship between the input signal power and the digital signal amplitude in the digital baseband and establishing the relationship between the input signal power, the Automatic Gain Control (AGC) Control voltage, and the digital signal amplitude. However, for a spread spectrum communication system, because a digital receiver can generally implement carrier-to-noise ratio demodulation, the existing calibration system cannot generally solve the problem of large error of an initial value of channel gain; in addition, the current calibration system cannot support the calibration of a plurality of receivers, has low calibration efficiency and is not suitable for the requirement of mass production.
Disclosure of Invention
The invention aims to provide a method and a system for calibrating channel gain of a digital receiver, which solve the defects that the calibration efficiency is low and the system is not suitable for large-scale production due to the fact that a plurality of receivers cannot be simultaneously calibrated in the conventional digital receiver calibration system, and a sampling circuit of the conventional calibration system is adversely affected by thermal noise and a receiver noise coefficient when the channel gain is high.
A method of calibrating gain of a digital receiver channel, comprising the steps of: step one, after a digital receiver to be calibrated is started up, establishing communication connection with a control host; step two, the digital receiver and the received calibration signal are initially synchronized, and after the initial synchronization is completed, the control host and the digital receiver perform initial channel gain alignment; step three, the control host predicts a control word and determines a channel gain corresponding to the control word; and step four, the control host formulates a channel gain calibration table according to the recorded control words and the channel gains.
In the above method, in the first step, after the digital receiver is powered on, the method further includes: the digital receiver firstly sends a starting signal to the control host, and after the control host receives the starting signal, the two parties establish connection through an initial handshake process.
The method, wherein the performing initial synchronization in the second step further includes: the digital receiver executes an initial synchronization process immediately after being started and enters a synchronization state with the calibration signal; and if the digital receiver is in the on state, receiving an instruction of the control host to start cell search, and entering a synchronous state with the searched calibration signal.
In the above method, the channel gain calibration table records a corresponding relationship between the channel gain G of the digital receiver and the control word; and the channel gain G is the power p of a digital signal formed in a digital baseband after sampling by a sampling circuit DBB And the power p of the calibration signal in The difference of (a): g = p DBB -p in 。
The method, wherein the power p of the calibration signal in There is a lowest end p in，min And the highest end p in，max (ii) a And a maximum value G of the channel gain G exists max And minimum value G min (ii) a A target value p for power of the digital signal DBB Target And the target value is determined by the digital receiver structure and the device type, the maximum value of the channel gainG max And minimum value G min Respectively expressed as:
the method above, wherein the initial channel gain alignment in the second step further includes: the control host firstly controls the power of the calibration signal to reach the highest end p of the calibration signal in，max Then the initial value of the channel gain is the minimum value G of the channel gain min (ii) a And the measured channel gain of each digital receiver is G i Then the error of the initial value of the channel gain is: Δ G i ＝G i -G min (ii) a The initial value of the channel gain is adjusted to G min The required control word length is: Δ c i ＝[-ΔG i /k i ](ii) a The control word of the digital receiver is adjusted to: c. C i ＝c min +Δc i (ii) a <xnotran> , [ </xnotran>]Representing rounding; i is at least 1 and not greater than the connected digital receiverThe number of (2); channel gain control coefficient k i Representing the channel gain adjusted by a unit control word; c. C min Is the minimum value of the control word at the start of the calibration.
The method as described above, wherein the channel gain control coefficient k i Is an initial value, and the initial value is determined by the model and batch of the digital receiver.
The method, wherein the step three of controlling the host predictive control word further comprises: according to the formulaCalculating a current channel gain control coefficient; according to the formula Δ G i ＝G i，n+1 -G i，n Calculating the current adjustment step length of the channel gain; the adjustment step size of the control word for the next adjustment is: c. C i，n+1 ＝c i，n +[ΔG i /k i，n ](ii) a In the formula, G i，n Is the current channel gain, G i，n-1 Is the channel gain, G, of the last adjustment i，n+1 Target channel gain for next adjustment, c in Is the current control word, c i，n-1 Is the last control word adjusted.
The method, wherein when the channel gain is close to the maximum value, the control host controls the power of the calibration signal not to exceed a predetermined value for saturating the sampling circuit, and increases the channel gain.
The method, wherein the formulating the channel gain calibration table further comprises: and the control host operates the data recorded in the calibration process by adopting interpolation and/or curve fitting, generates a channel gain calibration table and sends the channel gain calibration table to the digital receiver.
A system for calibrating gain of a digital receiver channel comprises at least one calibration station, a control host, a signal generator and a power divider; the calibration station is used for connecting a digital receiver; the control host is connected with each calibration station through a control bus, controls the working mode of the digital receiver positioned at the calibration station, and adjusts the working mode and corresponding parameters of the signal generator; after the calibration data are obtained, processing the calibration data and generating a channel gain calibration table; the signal generator is used for generating an original calibration signal and inputting the original calibration signal into the power divider through a signal line; the power distributor is connected to each of the calibration stations by a signal line for distributing the raw calibration signal to the digital receivers located at each of the calibration stations.
The system, wherein the channel of the digital receiver at least comprises a surface acoustic wave filter, a low noise amplifier, a mixer, and a variable gain amplifier; the channel gain of the channel is controlled by the digital baseband;
the digital baseband generates an automatic gain control word, the control word is converted into a voltage signal through digital-to-analog conversion and is input to a gain control end of the variable gain amplifier, and the voltage signal controls the gain of the variable gain amplifier.
In the system, the original calibration signals sent by the signal generator are uniformly distributed by the power distributor, the distributed calibration signals are input to the digital receivers located on the calibration stations, and when the power of the distributed calibration signals is lower than a predetermined value, the calibration stations connected to the power distributor are not increased any more.
In the above system, the channel gain calibration table records a correspondence between a channel gain G of the digital receiver and the control word; and the channel gain G is the power p of a digital signal formed after sampling by a sampling circuit in a digital baseband DBB And the power p of the calibration signal in The difference of (a): g = p DBB -p in 。
By applying the method and the system for calibrating the channel gain of the digital receiver, which are provided by the invention, as the simultaneous calibration of a plurality of receivers is supported, the calibration time of the receivers and the use cost of instrument equipment are greatly reduced, so that the calibration method and the calibration system are suitable for the large-scale production of the receivers; because the channel gain control coefficient is dynamically predicted, the gain adjustment is rapid and accurate, and the calibration speed is improved; meanwhile, the influence of thermal noise and the noise coefficient of a receiver when the channel gain is higher is eliminated, and the calibration precision is improved.
Drawings
Fig. 1 is a schematic structural diagram of a conventional digital receiver according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a system for calibrating channel gains of multiple digital receivers according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical features and implementation effects of the present invention clearer, the technical solutions of the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The present invention is directed to a method and system for calibrating the gain of a digital receiver channel, for example, a conventional digital receiver depicted in fig. 1, where the digital receiver channel generally includes components such as a SAWF, an LNA, a mixer, and a VGA. Due to the influence of factors such as inconsistency of devices and deviation of a production process, channel gains of different digital receivers under the same VGA control voltage may be different; in order to adjust the analog input signal entering the sampling circuit to the normal amplitude quickly and accurately, ensure the measurement accuracy of the system to meet the requirement of system design, and eliminate the receiver performance deterioration caused by the amplitude change of the digital signal of the input digital baseband; this requires channel gain calibration before the receiver leaves the factory to eliminate receiver individual differences, and these calibrations usually include: the digital baseband generates corresponding AGC control words according to the adjustment requirement on channel gain, and the AGC control words form voltage signals after digital-to-analog conversion and are input to a gain control end of the VGA so as to ensure that the analog input signals entering the sampling circuit are in normal amplitude at any time; therefore, the calibration process of the channel gain seen from the digital baseband is essentially a process for establishing the corresponding relation between the AGC control word and the channel gain; the receiver needs to measure parameters such as power of an input signal at the antenna port, which requires the receiver to detect the power of a digital signal in the digital baseband and also to know the channel gain of the digital receiver, and to calculate parameters such as power of the input signal at the antenna port according to the two parameters.
It should be noted that fig. 1 is a schematic diagram of a typical digital receiver structure, which is a preferred embodiment of the present invention, but does not mean that the technique of the present invention is only applicable to the receiver shown in fig. 1, and in fact, the present invention can be applied as long as the digital baseband can control the channel gain of the receiver by some method, and the precise control relationship needs to be determined by calibration.
The structure of the digital receiver channel gain calibration system is shown in fig. 2, and mainly includes a control host 201, a calibration station 202, a digital receiver 203, a signal generator 204, and a power divider 205; there may be more than one calibration station 202, and the specific number may be determined according to the parameters of the signal generator 204 and the power divider 205 selected.
The control host 201 is used for controlling the operation mode of the digital receiver 203, adjusting the operation mode and parameters of the signal generator 204, and processing the calibration data to generate the channel gain calibration table after acquiring the calibration data.
The signal generator 204 is used for generating a raw calibration signal s ref And inputs the raw calibration signal to the power divider 205.
A power divider 205 is used to distribute the raw calibration signal generated by the signal generator 204 to the digital receivers 203 above the respective calibration stations 202.
The channel gain of the digital receiver 203 is calculated by the following formula, and in the digital baseband, the average power of the digital signal can be expressed as:
wherein p is DBB W Is the digital signal power in the digital baseband, N is the number of sampling points at which the analog input signal into the sampling circuit is sampled, I n 、Q n The sampled I-path signal and Q-path signal are represented. MiningExpressed in logarithmic units as:
wherein 1mW represents 1 milliwatt; and hereinafter, if not otherwise specified, the unit of power is dBm and the unit of gain is dB.
The channel gain of a digital receiver can be expressed as the difference in power of the digital signal and the input signal of the antenna port:
G＝p DBB -p in (3)
during calibration, p DBB Can be calculated by the formula (1) and the formula (2), p in Which is the power of the input signal to the receiver antenna port, can be obtained by looking up the operating state and operating parameters of the signal generator 204, from which the channel gain G is calculated according to equation (3). And corresponds to the lowest end p of the dynamic range of the calibration signal in，min And highest end p in，max The dynamic range of the receiver channel gain also has a maximum and minimum value, denoted as G max And G min And G is max Corresponding to the lowest end of the dynamic range of the calibration signal, G min Setting the target value of the digital signal power as p corresponding to the highest end of the dynamic range of the calibration signal DBB Target Then the maximum and minimum values of the channel gain can be expressed as:
the lowest end p of the dynamic range of the calibration signal in，min And highest end p in，max The target value p of the digital signal power is specified by national standards, industry standards and the like of the field of use DBB Target The method is determined according to factors such as receiver structure, device type and the like during system design; thus, when the receiver design is determined, G max And G min And is uniquely determined.
When the power of the digital signal is calculated according to equation (1), the number of the sampling points must be sufficient, which means that the calculated power value is guaranteed to represent the actual power of the digital signal, and the signal generated by the signal generator 204 used for calibration must also meet the requirement of the digital receiver for normal operation, so as to ensure that the digital signal can truly reflect the gain characteristic of the channel.
The calibration process by applying the device and the formula can be divided into steps A to F according to different calibration stages, A station detection, B initial synchronization, C initial channel gain alignment, D step length prediction, E full dynamic range calibration and F data processing.
Step A, station detection: the main purpose of the station detection is to determine whether a digital receiver 203 is present in each station, and when the digital receiver 203 is connected to the calibration station 202 and turned on, a connection is established between the digital receiver 203 and the control host 201 through an initial handshake process, so that the control host 201 knows that the digital receiver 203 is present at the calibration station 202.
Step B, initial synchronization: the initial synchronization is performed by the digital receiver 203 by performing a predetermined synchronization procedure, and the calibration signal s generated by the signal generator 204 ref A process of implementing synchronization;
the initial synchronization can be divided into a startup initial synchronization and b startup initial synchronization:
a. the initial synchronization is performed by starting the synchronization process immediately after the digital receiver 203 is turned on and comparing the synchronization process with the calibration signal s of the signal generator 204 ref Entering a synchronous state;
b. the initial synchronization after the power-on is that the digital receiver 203 receives the instruction of the control host 201 through the control bus in the power-on state, starts the cell search process and compares the cell search process with the calibration signal s of the signal generator 204 ref And entering a synchronous state.
After the initial synchronization is successfully completed, the digital receiver 203 continuously receives the calibration signal generated by the signal generator 204 and maintains the synchronization state with the signal generator 204.
The following steps C to F describe the control of the respective calibration stations 202 by the control host 201 at the beginning of the calibration processAfter initial channel gain alignment, the digital receiver 203 derives a minimum channel gain G min After the calibration is started, the control host 201 controls the channel gain of the digital receiver 203 of each calibration station 202 to rise synchronously by step prediction, which specifically includes:
step C, initial channel gain alignment: when the calibration process starts, the control host 201 sends an instruction to each digital receiver 203 to start the channel gain calibration; the control host 201 first controls the signal generator 204 to generate the highest end p of the dynamic range of the calibration signal in，max Since the digital receiver 203 may not have been calibrated for channel gain before, the AGC control word used at this time is usually not the minimum value G of the dynamic range of channel gain min 。
Assuming the initial channel gain as the minimum value G of the channel gain dynamic range min The measured channel gain of the digital receiver 203 at each calibration station 202 is G i Then the channel gain error can be expressed as:
ΔG i ＝G i -G min (6)
for digital receiver 203, to adjust the channel gain to G min The length of the AGC control word to be adjusted is:
Δc i ＝[-ΔG i /k i ](7)
wherein [ 2 ]]Denotes a rounding, i is at least 1 and is not greater than the number of connected digital receivers, k i Is thatA channel gain control coefficient representing a channel gain which can be adjusted by a unit control word, and defined by equation (11), k i May be determined based on the model of the receiver, the batch, etc.
To align the initial channel gain G min Then the AGC control word of the digital receiver 203 may be adjusted to:
c i ＝c min +Δc i (8)
wherein c is min Is used at the beginning of calibrationCan be determined according to the receiver model and the batch.
After the initial channel gain alignment, the difference between the initial channel gains of the digital receivers 203 is reduced to a certain range, so that only k is actually required i Initial value of (a) and c min The difference between the initial channel gains of the digital receivers 203 is not more than 2dB; in the actual calibration process, if the gain error is still larger after the first initial channel gain alignment, the alignment operation may be performed again, and after the second alignment, it is concluded from practice that the error of the channel gain at this time does not exceed 1dB generally.
Step D, step length prediction: in order to enable the digital receiver 203 to quickly and accurately adjust to the target gain during the calibration process after the initial channel gain alignment, the AGC control coefficient k needs to be predicted relatively accurately, because the control coefficient is a parameter related to the receiver model, lot, and current channel gain range, and thus the step size is predicted dynamically according to the current calibration data during the calibration process.
For a smaller range of AGC control words, the channel gain can be approximately considered to be in a first order functional relationship with the magnitude of the AGC control word; let the current digital receiver 203 channel gain be G i，n The power control coefficient is k i，n The next adjusted target channel gain is G i，n+1 Then the channel gain adjustment step size is:
ΔG i ＝G i，n+1 -G i，n (9)
the AGC control word adjustment step size is:
c i，n+1 ＝c i，n +[ΔG i /k i，n ] (10)
gain control coefficient k in equation (10) i，n Comprises the following steps:
in the formula, G i，n Is the current channel gain, G i，n-1 Is the channel gain, G, of the last adjustment i，n+1 Target channel gain for next adjustment, c i，n Is the step size of the current control word, c i，n-1 Is the step size of the control word adjusted last time, so as can be seen from equation (11), the system uses the previous actual gain control coefficient asThe predicted gain control coefficient for the current step size.
Step E, calibrating the full dynamic range: in order to ensure that the digital receiver 203 can accurately calculate the power of the digital signal, the control host 201 adjusts the output power of the signal generator 204 in time according to the current channel gain so that the power of the digital signal reaching the digital baseband is at p DBB Target Nearby.
The channel gain of the digital receiver 203 at a certain station reaches the maximum gain G max Thereafter, the control host 201 stops the calibration of the channel gain of the receiver, and when the channel gain of the receiver of all the workstations reaches G max The control host 201 may then stop the full dynamic range calibration process. In the full dynamic range calibration process, the control host 201 records the AGC control word at each adjustment and the channel gain obtained by actual measurement for subsequent data processing.
It should be further noted that, when the channel gain G is located near the maximum value, the signal-to-noise ratio of the digital signal in the digital baseband usually suffers from a relatively severe degradation due to the influence of thermal noise and the noise figure of the receiver, and in order to eliminate the large influence of the degradation of the signal-to-noise ratio on the power measurement of the digital baseband, when the channel gain is close to the maximum, the power of the input signal may not be reduced, and at this time, if the channel gain G is increased gradually, the power of the digital signal may be higher than the designed value p DBB Target However, as long as the calibration signal does not saturate the sampling circuit, the measurement error can be basically ignored, and the method can overcome the problem that the measurement is inaccurate at the highest end of the channel gain G in the existing calibration system.
Step F, data processing: in the full dynamic range calibration process, the channel gain G may be adjusted in large steps per measurement in order to speed up the calibration. In the actual operation process of the receiver, in order to accurately adjust the channel gain, a high-precision channel gain calibration table is usually required, and in order to meet the operation requirement of the receiver, the control host 201 must process the data recorded in the calibration process, and generate a calibration table meeting the actual operation requirement by an interpolation or curve fitting method.
The number of digital receivers supported by the invention is only limited by the output power of the signal generator, so that the simultaneous calibration of a plurality of receivers can be supported by detecting the relationship between the channel gain and the AGC control word. Because the simultaneous calibration of a plurality of receivers is supported, the calibration time of the receivers and the use cost of instrument equipment are greatly reduced, and the system is suitable for the mass production of the receivers; because the channel gain control coefficient is dynamically predicted, the gain adjustment is quick and accurate, the calibration speed is improved, meanwhile, the influence of thermal noise and the noise coefficient of a receiver when the channel gain is higher is eliminated, and the calibration precision is improved.
It should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting, and all the parameter values can be adjusted according to the actual situation and are within the scope of the claims. It will be understood by those skilled in the art that various modifications and equivalent changes may be made to the technical solution of the present invention without departing from the spirit of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims.
Claims (14)
1. A method for calibrating gain of a digital receiver channel, comprising the steps of:
step one, after a digital receiver to be calibrated is started, establishing communication connection with a control host;
step two, the digital receiver and the received calibration signal are initially synchronized, and after the initial synchronization is finished, the control host and the digital receiver are subjected to initial channel gain alignment;
step three, the control host predicts the step length of the control word and determines the channel gain corresponding to the step length of the control word;
and step four, the control host formulates a channel gain calibration table according to the recorded control words and the channel gains.
2. The method of claim 1, wherein in the first step, after the digital receiver is powered on, the method further comprises: the digital receiver firstly sends a starting signal to the control host, and after the control host receives the starting signal, the two parties establish connection through an initial handshake process.
3. The method of claim 1, wherein performing the initial synchronization step in the second step further comprises:
the digital receiver executes an initial synchronization process immediately after being started and enters a synchronization state with the calibration signal;
and if the digital receiver is in the power-on state, receiving an instruction of the control host to start cell search, and entering a synchronous state with the searched calibration signal.
4. The method of claim 1, wherein the channel gain calibration table records a correspondence relationship between a channel gain G of the digital receiver and the control word; and the channel gain G is the power p of a digital signal formed after the digital baseband is sampled by the sampling circuit DBB And the power p of the calibration signal in The difference of (c): g = p DBB -p in 。
5. The method of claim 4, wherein the first and second light sources are selected from the group consisting of,characterized in that the power p of the calibration signal in There is a lowest end p in，min And the highest end p in，max (ii) a And the channel gain G has a maximum value G max And minimum value G min (ii) a The power of the digital signal has a target value p DBB Target And the target value is determined by the structure of the digital receiver and the type of the device, the maximum value G of the channel gain max And minimum value G min Respectively expressed as:
6. the method of claim 1 or 5, wherein the initial channel gain alignment in step two further comprises:
the control host firstly controls the power of the calibration signal to reach the highest end p of the calibration signal in，max Then the initial value of the channel gain is the minimum value G of the channel gain min (ii) a And the measured channel gain of each digital receiver is G i Then, the error of the initial value of the channel gain is: Δ G i ＝G i -G min ；
The initial value of the channel gain is adjusted to G min The required control word length is: Δ c i ＝[-ΔG i /k i ](ii) a The control word of the digital receiver is adjusted to: c. C i ＝c min +Δc i ；
<xnotran> , [ </xnotran>]Representing rounding; i is at least 1 and not greater than the number of connected digital receivers; the channel gain control coefficient ki represents the channel gain adjusted by the unit control word; c. C min Is the minimum value of the control word at the start of the calibration.
7.The method of claim 6, wherein the channel gain control coefficient k is i Is an initial value, and the initial value is determined by the model and batch of the digital receiver.
8. The method of claim 1, wherein the step three controlling the host to predict the control word further comprises:
according to the formula
Calculating a current channel gain control coefficient; according to the formula Δ G i ＝G i，n+1 -G i，n Calculating the current adjustment step length of the channel gain;
the adjustment step size of the control word for the next adjustment is: c. C i，n+1 ＝c i，n +[ΔG i /k i，n ]；
In the formula, G i，n Is the current channel gain, G i，n-1 Is the channel gain, G, of the last adjustment i，n+1 Target channel gain for next adjustment, c i，n Is the current control word, c i，n-1 Is the last adjusted control word.
9. The method of claim 1, wherein the control host controls the power of the calibration signal not to exceed a predetermined number to saturate the sampling circuit and increases the channel gain when the channel gain is near a maximum value.
10. The method of claim 1, wherein the formulating a channel gain calibration table further comprises: and the control host operates the data recorded in the calibration process by adopting interpolation and/or curve fitting, generates a channel gain calibration table and sends the channel gain calibration table to the digital receiver.
11. A system for calibrating the gain of a digital receiver channel is characterized by comprising at least one calibration station, a control host, a signal generator and a power divider;
the calibration station is used for connecting a digital receiver;
the control host is connected with each calibration station through a control bus, controls the working mode of the digital receiver positioned at the calibration station, and adjusts the working mode and the corresponding parameters of the signal generator; after the calibration data are obtained, processing the calibration data and generating a channel gain calibration table;
the signal generator is used for generating an original calibration signal and inputting the original calibration signal into the power divider through a signal line;
the power distributor is connected with each calibration station through a signal wire and is used for distributing the original calibration signal to the digital receiver positioned on each calibration station.
12. The system of claim 11, wherein the channels of the digital receiver comprise at least a surface acoustic wave filter, a low noise amplifier, a mixer, a variable gain amplifier; the channel gain of the channel is controlled by the digital baseband;
the digital baseband generates automatic gain control words, the control words are converted into voltage signals through digital-to-analog conversion and input to the gain control end of the variable gain amplifier, and the voltage signals control the gain of the variable gain amplifier.
13. The system of claim 11, wherein said raw calibration signals from said signal generator are evenly distributed by said power splitter, the distributed calibration signals are input to respective ones of said digital receivers located at said calibration stations, and when the power of said distributed calibration signals is below a predetermined value, the calibration stations to which said power splitter is connected are not increased.
14. The system according to claim 11, wherein the channel gain calibration table records a corresponding relationship between the channel gain G of the digital receiver and the control word; and the channel gain G is the power p of a digital signal formed after the sampling of the sampling circuit in the digital baseband DBB And the power p of the calibration signal in The difference of (c): g = p DBB -p in 。
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| FR2848361B1 (en) * | 2002-12-04 | 2005-02-18 | Nortel Networks Ltd | METHOD FOR DETECTING A SIGNAL AND RECEIVER SYSTEM FOR IMPLEMENTING THE METHOD |
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| EP1494413A1 (en) * | 2003-07-02 | 2005-01-05 | CoreOptics, Inc., c/o The Corporation Trust Center | Channel estimation and sequence estimation for the reception of optical signal |
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2007
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| CN102158273B (en) * | 2010-11-24 | 2013-10-16 | 意法·爱立信半导体（北京）有限公司 | Method and device for realizing terminal calibration, and terminal |
| CN104991212A (en) * | 2015-07-07 | 2015-10-21 | 湖南大学 | Current acquisition channel self-calibration method based on least square linear interpolation |
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| CN108141271A (en) * | 2015-10-14 | 2018-06-08 | 法国大陆汽车公司 | Phase diversity type radio-frequency transmitter |
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| CN106375039A (en) * | 2016-08-17 | 2017-02-01 | 中国电子科技集团公司第四十研究所 | Method for improving dynamic range of receiver of vector network analyzer |
| CN106375039B (en) * | 2016-08-17 | 2018-11-02 | 中国电子科技集团公司第四十一研究所 | A method of improving vector network analyzer receiver dynamic range |
| CN107579785A (en) * | 2017-09-14 | 2018-01-12 | 中国电子科技集团公司第四十研究所 | A kind of calibration interpolation method under signal receiver frequency sweep mode |
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