CN110392421B - Signal processing method and device based on AGC - Google Patents

Signal processing method and device based on AGC Download PDF

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CN110392421B
CN110392421B CN201810351066.3A CN201810351066A CN110392421B CN 110392421 B CN110392421 B CN 110392421B CN 201810351066 A CN201810351066 A CN 201810351066A CN 110392421 B CN110392421 B CN 110392421B
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parameter
agc
power back
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CN110392421A (en
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赵丽
赵锐
彭莹
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Datang Mobile Communications Equipment Co Ltd
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Datang Mobile Communications Equipment Co Ltd
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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
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/52—TPC using AGC [Automatic Gain Control] circuits or amplifiers

Abstract

The embodiment of the invention provides a signal processing method and device based on AGC (automatic gain control), which are used for solving the technical problem of poor signal receiving and processing effects of receiving end equipment in the prior art. The method comprises the following steps: determining a modulation mode adopted by a service signal sent by sending end equipment; determining at least one AGC power back-off parameter corresponding to the modulation mode according to a preset lookup table, and receiving and processing the service signal according to the at least one AGC power back-off parameter; the preset lookup table records multiple modulation modes supported by the sending end device and AGC power back-off parameters corresponding to each modulation mode, so that the AGC safety margin can be dynamically set according to different modulation modes, and the success rate of receiving and processing service signals is improved.

Description

Signal processing method and device based on AGC
Technical Field
The present invention relates to the field of communications, and in particular, to a signal processing method and device based on AGC.
Background
In the wireless communication process, the terminal receiver needs to amplify or reduce the Analog signal through an Analog Gain Control (AGC) so that the signal can fall within a reasonable range of the a/D during the sampling process of an Analog Digital Converter (ADC).
At present, a terminal receiver mainly sets a reasonable AGC target value, that is, the size of a safety capacity (safetymargin) of AGC, according to a number of supported AGC bits (used for indicating the accuracy of converting an analog signal into a digital signal), so as to ensure a certain received power redundancy, and enable the terminal receiver to set a reasonable AGC processing range.
However, if the system is on a given resource, because different received services may adopt different modulation and coding modes, the distance between high-order modulated constellations is smaller, the influence on quantization noise is more sensitive, and the AGC working interval of high-order modulation is smaller. Therefore, if the receiving end device only considers setting the safety margin of AGC according to one modulation mode, it is easy to affect the demodulation accuracy, and even cause the reception failure of the signal.
In summary, in the prior art, the receiving end device has a poor effect of receiving and processing signals.
Disclosure of Invention
The embodiment of the invention provides a signal processing method and device based on AGC (automatic gain control), which are used for solving the technical problem of poor signal receiving and processing effects of receiving end equipment in the prior art.
In a first aspect, an embodiment of the present invention provides a signal processing method based on AGC, including the following steps:
Determining a modulation mode adopted by a service signal sent by sending end equipment;
determining at least one AGC power back-off parameter corresponding to the modulation mode according to a preset lookup table; the preset look-up table records a plurality of modulation modes supported by the sending terminal equipment and AGC power back-off parameters corresponding to each modulation mode;
and receiving and processing the service signal according to the at least one AGC power back-off parameter.
Optionally, before determining at least one AGC power backoff parameter corresponding to the modulation scheme according to a preset lookup table, the method further includes:
acquiring modulation information sent by the sending end equipment through a control channel, wherein the modulation information is used for indicating a plurality of modulation modes supported by the sending end equipment;
determining a peak value of a signal quantization noise ratio SQNR corresponding to each modulation mode in the multiple modulation modes;
determining AGC power back-off parameters corresponding to corresponding modulation modes according to the SQNR peak value;
and generating a preset lookup table according to the corresponding relation between the modulation mode and the AGC power back-off parameter.
Optionally, determining an AGC power back-off parameter corresponding to each modulation mode according to the peak value of the SQNR includes:
Determining an initial backoff power value corresponding to the peak value of the SQNR and an offset value corresponding to the SQNR;
and determining the sum of the initial backoff power value and the offset value as an AGC power backoff parameter corresponding to the corresponding modulation mode.
Optionally, the receiving and processing the service signal according to the at least one AGC power back-off parameter includes:
determining a target AGC power back-off parameter of the at least one AGC power back-off parameter;
setting the target AGC power back-off parameter as the receiving power of the receiving end equipment;
and receiving and demodulating the service signal according to the target AGC power back-off parameter.
Optionally, determining a target AGC power back-off parameter in the at least one AGC power back-off parameter includes:
and determining the AGC power back-off parameter with the minimum value in the at least one AGC power back-off parameter as the target AGC power back-off parameter.
Optionally, after setting the target AGC power back-off parameter as the received power of the receiving end device, the method further includes:
determining that the modulation mode of a service signal sent by the sending end equipment is changed;
determining AGC power back-off parameters corresponding to the changed modulation mode according to the preset lookup table;
And updating the receiving power of the receiving end equipment according to the determined AGC power back-off parameter.
In a second aspect, an embodiment of the present invention provides a receiving end device, including:
the receiver is used for determining a modulation mode adopted by a service signal sent by sending end equipment;
the processor is used for determining at least one AGC power back-off parameter corresponding to the modulation mode according to a preset lookup table and receiving and processing the service signal according to the at least one AGC power back-off parameter; wherein, the preset look-up table records a plurality of modulation modes supported by the sending terminal equipment and AGC power back-off parameters corresponding to each modulation mode,
optionally, the receiver is further configured to: before determining at least one AGC power back-off parameter corresponding to the modulation mode according to a preset look-up table, acquiring modulation information sent by the sending end equipment through a control channel, wherein the modulation information is used for indicating a plurality of modulation modes supported by the sending end equipment;
the processor is further configured to: determining a peak value of a signal quantization noise ratio SQNR corresponding to each modulation mode in the multiple modulation modes; determining AGC power back-off parameters corresponding to corresponding modulation modes according to the SQNR peak value; and generating a preset lookup table according to the corresponding relation between the modulation mode and the AGC power back-off parameter.
Optionally, the processor is configured to:
determining an initial backoff power value corresponding to the peak value of the SQNR and an offset value corresponding to the SQNR;
and determining the sum of the initial backoff power value and the offset value as an AGC power backoff parameter corresponding to the corresponding modulation mode.
Optionally, the processor is specifically configured to:
determining a target AGC power back-off parameter of the at least one AGC power back-off parameter;
setting the target AGC power back-off parameter as the receiving power of the receiving end equipment;
and receiving and demodulating the service signal according to the target AGC power back-off parameter.
Optionally, the processor is specifically configured to:
and determining the AGC power back-off parameter with the minimum value in the at least one AGC power back-off parameter as the target AGC power back-off parameter.
Optionally, the processor is further configured to:
after the target AGC power back-off parameter is set as the receiving power of the receiving end equipment, the change of the modulation mode of the service signal sent by the sending end equipment is determined, the AGC power back-off parameter corresponding to the changed modulation mode is determined according to the preset query table, and the receiving power of the receiving end equipment is updated according to the determined AGC power back-off parameter.
In a third aspect, an embodiment of the present invention provides a receiving end device, including:
the first determining module is used for determining a modulation mode adopted by a service signal sent by sending end equipment;
a second determining module, configured to determine, according to a preset lookup table, at least one AGC power backoff parameter corresponding to the modulation mode; the preset look-up table records a plurality of modulation modes supported by the sending terminal equipment and AGC power back-off parameters corresponding to each modulation mode;
and the receiving module is used for receiving and processing the service signal according to the at least one AGC power back-off parameter.
Optionally, the receiving end device further includes:
an obtaining module, configured to obtain, through a control channel, modulation information sent by the sending end device before determining at least one AGC power backoff parameter corresponding to the modulation mode according to a preset lookup table, where the modulation information is used to indicate multiple modulation modes supported by the sending end device;
a third determining module, configured to determine a peak value of a signal quantization noise ratio SQNR corresponding to each modulation scheme in the multiple modulation schemes;
determining AGC power back-off parameters corresponding to corresponding modulation modes according to the SQNR peak value;
And generating a preset lookup table according to the corresponding relation between the modulation mode and the AGC power back-off parameter.
Optionally, the second determining module is configured to:
determining an initial backoff power value corresponding to the peak value of the SQNR and an offset value corresponding to the SQNR;
and determining the sum of the initial backoff power value and the offset value as an AGC power backoff parameter corresponding to the corresponding modulation mode.
Optionally, the second determining module is specifically configured to:
determining a target AGC power back-off parameter of the at least one AGC power back-off parameter;
setting the target AGC power back-off parameter as the receiving power of the receiving end equipment;
and receiving and demodulating the service signal according to the target AGC power back-off parameter.
Optionally, the second determining module is specifically configured to:
and determining the AGC power back-off parameter with the minimum value in the at least one AGC power back-off parameter as the target AGC power back-off parameter.
Optionally, the receiving end device further includes an update module,
the second determination module is further to: after the target AGC power back-off parameter is set as the receiving power of the receiving end equipment, determining that the modulation mode of a service signal sent by the sending end equipment is changed, and determining an AGC power back-off parameter corresponding to the changed modulation mode according to the preset lookup table;
The update module is to: and updating the receiving power of the receiving terminal equipment according to the determined AGC power back-off parameter.
In a fourth aspect, an embodiment of the present invention provides a computer apparatus comprising a processor configured to implement the steps of the method according to the first aspect when executing a computer program stored in a memory.
In a fifth aspect, the present invention provides a readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the steps of the method according to the first aspect.
In the embodiment of the invention, because the preset look-up table records a plurality of modulation modes supported by the receiving end equipment and the AGC power back-off parameter corresponding to each modulation mode, when the sending end equipment sends the service signal, the receiving end equipment can determine at least one AGC power back-off parameter corresponding to the modulation mode according to the preset look-up table by determining the modulation mode adopted by the service signal, and further receive and process the service signal according to the at least one AGC power back-off parameter, therefore, in the process of receiving the service signal by the receiving end equipment, the corresponding AGC power back-off parameter can be determined according to different modulation modes of the service signal, the AGC safety margin can be dynamically set according to different modulation modes, and the success rate of receiving and processing the service signal is improved.
Drawings
FIG. 1 is a schematic diagram of an analog AGC implementation used in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a corresponding relationship between SQNR and backoff according to different modulation modes in the embodiment of the present invention;
FIG. 3 is a flow chart of an AGC-based signal processing method according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a receiving end device in the embodiment of the present invention;
fig. 5 is a schematic block diagram of a receiving end device according to an embodiment of the present invention;
FIG. 6 is a block diagram of a computer device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
The solution described herein may be used for a receiving end device, such as a receiver or a terminal device comprising a receiver.
First, some terms in the embodiments of the present invention are explained so as to be easily understood by those skilled in the art.
1) And an AGC system, an automatic control system for automatically adjusting the gain of the amplifying circuit according to the signal intensity.
Fig. 1 is a schematic diagram of an implementation of a conventional analog AGC used in an embodiment of the present invention. In analog AGC 3 intervals are defined: saturation region (Over-ranging region), Operating region (Operating-ranging region), and Under-ranging region (Under-ranging region).
The received signal in the saturation region is too strong, which easily causes the receiver to be saturated and cannot receive the signal; when the signal is too low, the received signal is too weak, which easily causes that the receiver cannot distinguish the effective received signal. Therefore, both the intervals are intervals in which the AGC cannot normally operate during signal reception, and should be avoided as much as possible.
During the receiving process, the input power of AGC can not exceed ADCmaxOtherwise, the received signal is saturated; in order to meet the minimum Signal-to-Noise Ratio (SNR) requirement, the input power cannot be lower than Pmin. Meanwhile, considering that the power of the received signal has jitter, a Safety margin (Safety margin) can be set, so that even if the input signal is higher than the AGC working interval, the receiving process can be carried out within the Safety margin range, and the receiving process can still be carried out under the influence of peak clipping noise. When the ADC bit of the receiving end device is higher, the quantization interval is smaller, and the ADC accuracy is higher.
2) The signal-to-quantization noise ratio (SQNR), which is the ratio of the effective signal to the quantization noise in the conversion process of the analog signal into the digital signal, can be used to illustrate the influence of the deviation of the input signal after quantization processing. The calculation method is as follows:
Figure BDA0001633303290000071
In the formula (1), SiRepresenting the continuous values of the original signal; si-qRepresenting the corresponding quantized discrete values of the original signal, so that there is an error S between the discrete values and the continuous valuesi-Si-qThe numerator part represents the effective signal average power, the denominator part represents the quantization noise average power, N is a positive integer, and i is a positive integer less than or equal to N.
In practical applications, setting different safety margins, i.e. power backoff (backoff) values, may affect the size of the AGC operating interval, i.e. the quantization interval, and thus the SQNR. For example, in a Line-of-Sight (LOS) channel, SQNR and backoff correspondences are different.
Fig. 2 is a schematic diagram of a corresponding relationship between SQNR and backoff when different modulation schemes are adopted in an LOS channel, where BPSK and 64QAM are taken as examples. As can be seen from FIG. 2, when the transmitter transmits signals by using different modulation methods, the peak value of SQNR (black dots in the figure) is from-3 dB to-7 dB, and then the influence of the same value respectively shifted from the peak point to the left and right on the receiving performance is analyzed according to the modulation methods. Because the distance between the constellation points of the high-order modulation is small, the offset values of different modulation modes may be different, that is, the backoff values may also be different.
Therefore, in the prior art, the receiver only considers setting the safety margin of the AGC according to one modulation mode, which is liable to affect the demodulation accuracy and even cause the reception failure of the signal.
In view of this, the AGC-based signal processing method and apparatus provided in the embodiments of the present invention can determine, through the preset lookup table, the AGC power back-off parameter corresponding to the modulation mode adopted by the service signal, and further perform receiving processing on the service signal according to the determined AGC power back-off parameter, so as to implement receiving processing on the signal according to the AGC power back-off parameters corresponding to each modulation mode for transmission information of different modulation modes, and enable a success rate of signal reception to be higher.
The technical solutions provided in the present application are further described in detail below with reference to the drawings of the specification.
Fig. 3 is a schematic diagram of a signal processing method based on AGC according to an embodiment of the present invention, which can be implemented by a receiving end device, for example, a terminal device equipped with a receiver, and a flow of the method is described as follows.
S11: determining a modulation mode adopted by a service signal sent by sending end equipment;
s12: determining at least one AGC power back-off parameter corresponding to a modulation mode according to a preset look-up table; the preset lookup table records a plurality of modulation modes supported by the sending end equipment and AGC power back-off parameters corresponding to each modulation mode;
S13: and receiving and processing the service signal according to at least one AGC power back-off parameter.
In a specific implementation process, the service signal may be a transmission signal corresponding to a service, such as a transmission signal of a traffic service, a transmission signal of a call service, and the like, sent by a sending end device, such as a terminal device including a sender, through a traffic channel.
The receiving end device may determine the modulation scheme used by the service signal, and in practical applications, the service signal of the same service may use one or more modulation schemes.
For example, for traffic service, a sending end device in a communication system may use 16Quadrature Amplitude Modulation (16 QAM) to encode a transmission signal, for example, when a terminal traffic demand is small, in the Modulation scheme, one symbol represents 4 bits; alternatively, the sending end device may use 64Quadrature Amplitude Modulation (64 QAM) to encode the transmission signal, for example, when the traffic demand of the terminal is large, in the Modulation scheme, one symbol represents 6 bits.
After determining the modulation mode used by the service information, the receiving end device may enter S12, and determine an AGC power back-off parameter (backoff value) corresponding to each modulation mode, that is, a safety margin of the AGC, by querying a preset lookup table.
The preset lookup table may be preset by the receiving end device. The setting process can be as follows:
1) the receiving end equipment acquires modulation information sent by the sending end equipment through a control channel, wherein the modulation information is used for indicating a plurality of modulation modes supported by the sending end equipment;
the multiple modulation schemes supported by the sending end device may refer to part or all of the modulation schemes supported by the communication system. For example, the modulation schemes supported by the sending end device may include: quadrature Phase Shift Keying (QPSK), eight Phase Shift Keying (8Phase Shift Keying, 8PSK), 16QAM, 64QAM, and the like.
2) Determining the peak value of the SQNR corresponding to each modulation mode in the supported multiple modulation modes;
in practical applications, the receiving end device may calculate the SQNR of each modulation scheme according to formula 1, and determine the peak power of the SQNR, as shown in fig. 2.
3) And determining an AGC power back-off parameter corresponding to the corresponding modulation mode according to the determined SQNR peak value.
Specifically, after determining the peak value of the SQNR, the receiving end device may determine an initial back-off power value and an offset value corresponding to the SQNR, and further determine the sum of the initial back-off power value and the offset value as an AGC power back-off parameter corresponding to the modulation scheme.
The initial back-off power may refer to a backoff value corresponding to a peak value of the SQNR determined by the receiving end device according to an ADC bit number supported by the system and a corresponding relationship between the SQNR and the backoff value. It can also be considered that the initial back-off power is a back-off power value pre-counted by the system for the peak value of SQNR corresponding to different modulation schemes.
The offset value may be an offset value corresponding to the SNR-BLER curve when the receiving end device determines that the SNR-BLER curve satisfies the requirement, by analyzing the link performance, for example, converting peak clipping noise or quantization noise into noise in the system, calculating the SNR, and determining the influence of the offset from the peak point to the left and right to the receiving performance by the same value. In practical applications, the offset may be determined by using an existing method.
Specifically, in the embodiment of the present invention, when determining the offset, the processing for determining the reception performance may adopt, but is not limited to, the following manners:
mode 1: judging whether the deviation between the point of the received constellation diagram and the target constellation diagram is in a given range or not;
mode 2: and judging whether the SNR is required to be reasonable or not when the SNR-BLER is at the error rate of 10 percent, wherein the SNR is not too high.
When the receiving performance of the receiving end equipment meets the condition, the SQNR offset corresponding to the modulation mode can be obtained.
And then, the receiving terminal equipment calculates the sum of the initial back-off power and the offset value to obtain the AGC back-off power corresponding to the corresponding modulation mode.
For example, if it is determined that the peak value of the SQNR corresponding to the QPSK in the modulation scheme in the system is 75dB, the corresponding backoff value is-3 dB, and when the SNR-BLER curve meets the requirement, the acceptable offset value of the relative SQNR corresponding to the QPSK is-8 dB, the value of the AGC backoff power parameter corresponding to the QPSK is: -3+ (-8) ═ 11 dB.
4) And generating a preset lookup table according to the corresponding relation between the modulation mode and the AGC power back-off parameter.
The receiving end device can establish a corresponding relation between each modulation mode and the corresponding AGC power back-off parameter, and generate a preset lookup table, namely the corresponding relation between the modulation mode and the AGC power back-off parameter. The preset look-up table may record values of AGC power back-off parameters corresponding to each modulation mode supported by the sending end device. For example, Table 1 is a preset lookup Table for recording a corresponding relationship between a modulation mode supported by a sending end device and an AGC backoff value, and is also referred to as Table hereinaftermod_bo。
Modulation system AGC backoff
QPSK -11dB
16QAM -12dB
64QAM -13dB
BPSK -7dB
TABLE 1
In practical application, after the receiving end device establishes the preset lookup table, the table may be stored.
In the embodiment of the present invention, after determining the modulation mode used by the service information, the receiving end device may query, in a preset lookup table, the AGC power back-off parameter corresponding to each modulation mode, that is, determine at least one AGC power back-off parameter corresponding to the modulation mode used by the current service information.
For example, if the service information corresponds to 2 modulation schemes: QPSK and 16QAM, the AGC power back-off parameters, i.e. AGC back-off values, respectively corresponding to the two modulation modes can be looked up in the preset table.
Further, in S13, the receiving end device may determine a target AGC power back-off parameter in the at least one AGC power back-off parameter, and set the target AGC power back-off parameter as the receiving power of the system, so that the receiving end device may receive and demodulate the service signal according to the target AGC power back-off parameter.
Wherein, the target AGC power back-off parameter may be an AGC power back-off parameter with a smallest value among the at least one AGC power back-off parameter.
In another embodiment of the present invention, after the receiving end device sets the target AGC power back-off parameter as the receiving power of the system, if it is determined that the modulation mode of the service signal sent by the sending end device is changed, the AGC power back-off parameter corresponding to the changed modulation mode may be determined according to the preset lookup table, and the receiving power of the receiving end device is updated according to the determined AGC power back-off parameter.
The change of the modulation scheme of the traffic signal may be a change of the traffic, or may be a change of other reasons, for example, a data amount change of the traffic, and the like. Then, when the service modulation mode supported by the sending end device is changed, the receiving end device may determine whether the modulation mode and the corresponding AGC power back-off parameter are already recorded in the preset lookup table.
If the changed modulation mode is recorded, the preset lookup table can be directly queried to determine the corresponding AGC power back-off parameter, and the AGC back-off value of the system is set as the value of the determined AGC power back-off parameter.
If it is determined that the changed modulation method is not recorded in the preset lookup table, the GC power backoff parameter corresponding to the new modulation method may be determined according to the foregoing method, and added to the preset lookup table, and further, by querying the preset lookup table, a target AGC backoff value corresponding to the changed modulation method is determined, for example, a minimum AGC backoff value (for example, the changed service modulation method includes at least two types), or the AGC backoff value of the system is directly set as the AGC backoff value corresponding to the changed modulation method (for example, the changed modulation method is only 1 type).
Therefore, the flow of the signal receiving process in the embodiment of the present invention can be summarized as follows:
a) determining the ADC bit number given by the system and various modulation modes supported by the system, and obtaining an SQNR-backoff curve according to different modulation modes;
b) and obtaining SQNR peak values corresponding to different modulation modes according to different modulation modes, setting an offset value relative to the SQNR peak value according to the receiving performance under the condition of considering the influence of quantization noise and peak clipping noise, and calculating reasonable AGC backoff values corresponding to different modulation modes. For example, according to the backoff value, whether the constellation diagram receiving performance meets the requirement is judged; or judging whether the performance of the receiving SNR-BLER curve meets the requirement or not according to the backoff value.
c) Setting the corresponding relation between different modulation modes supported in the system and AGC backoff value in a Table Table under the given ADC bit numbermod_bo；
d) In the receiving process, according to a plurality of modulation modes supported by configuration in given resources (such as a resource pool), a Table Table in which different modulation modes and corresponding AGC backoff values are recorded is searchedmod_bo；
e) Finding AGC backoff corresponding to the modulation mode supported in the given resource, and selecting BO with the minimum backoff from the AGC backoffmin(i.e., greater margin of safety), BO minSetting as the backoff value of the system;
f) and if the supported modulation mode is changed in the given resource, returning to the step e) for query processing.
Therefore, in the embodiment of the present invention, the receiving end device can reasonably set the processing range of the AGC for the modulation mode supported by a given resource according to multiple modulation modes supported by the system, thereby reducing the reception failure caused by saturation due to unreasonable setting of the AGC backoff, and improving the performance of the system.
In the following, the application scenarios of the technical solutions in the embodiments of the present invention are further described by way of examples in combination with the above steps a) to f).
Example 1:
suppose that the system supports 3 modulation modes, which are QPSK, 16QAM and 64QAM, respectively, and the number of ADC bits supported in the system is 10. The receiving end device determines the SQNR-backoff curves of each modulation mode according to the modulation information sent by the sending end device through the control channel, and obtains SQNR peak values and initial backoff values corresponding to 3 different modulation modes, as follows:
the peak value of SQNR corresponding to QPSK is assumed to be 75dB, and the corresponding backoff value is-3 dB;
the peak value of the SQNR corresponding to the 16QAM is assumed to be 71dB, and the corresponding backoff value is-6 dB;
thirdly, the peak value of the SQNR corresponding to 64QAM is assumed to be 70dB, and the corresponding backoff value is-7 dB;
And then, the receiving end equipment calculates the SNR according to the link performance analysis, such as converting peak clipping noise or quantization noise into noise in the system, and according to whether an SNR-BLER curve meets the requirement or not.
Assuming that QPSK corresponds to an acceptable offset value of-8 dB from SQNR, AGC backoff is-3 + (-8) — 11 dB;
assuming that 16QAM has an acceptable offset value of-7 dB from SQNR, AGC backoff is-6 + (-7) to-13 dB;
assuming that 64QAM has an acceptable offset value of-5 dB with respect to the SQNR, AGC backoff is-7 + (-5) to-12 dB;
then, setting Table Table of corresponding relation between different modulation modes and AGC backoff valuesmod_boThe following are:
modulation system AGC backoff
QPSK -11dB
16QAM -13dB
64QAM -12dB
TABLE 2
Assuming that only QPSK and 16QAM are supported on a given resource (e.g., first service information), the receiving end device searches for a Table of correspondence between different modulation modes and AGC backoff values in the systemmod_boThe AGC backoff required to be set corresponding to QPSK is-11 dB, and the AGC backoff required to be set corresponding to 16QAM is-13 dB, that is, the 2 modulation modes included in the system correspond to different backoff values respectively. At this time, the receiving end device may compare QPSK and 16QAM and select the minimum AGC Backoff (BO)min) And setting the AGC backoff of the system to-13 dB for the AGC backoff corresponding to 16 QAM.
Example 2: 2 modulation modes exist in the system, and the corresponding backoff values are the same;
suppose that the system supports 3 modulation schemes, QPSK, 16QAM and 64QAM respectively. Assume that the number of ADC bits supported in the system is 10. The SQNR peak value and the initial backoff value respectively corresponding to the 3 different modulation modes determined by the receiving end device are as follows:
the peak value of SQNR corresponding to QPSK is assumed to be 75dB, and the corresponding backoff value is-3 dB;
the peak value of the SQNR corresponding to the 16QAM is assumed to be 71dB, and the corresponding backoff value is-6 dB;
thirdly, the peak value of the SQNR corresponding to the 64QAM is assumed to be 70dB, and the corresponding backoff value is-7 dB;
and then, the receiving end equipment judges whether the receiving performance meets the requirement according to the link performance analysis, such as by using a constellation diagram, so as to determine the bias value corresponding to each modulation mode.
Assuming that QPSK corresponds to an acceptable offset value of-8 dB from SQNR, AGC backoff is-3 + (-8) — 11 dB;
assuming that 16QAM has an acceptable offset value of-5 dB from SQNR, AGC backoff is-6 + (-5) — 11 dB;
assuming that 64QAM has an acceptable offset value of-4 dB with respect to the SQNR, AGC backoff is-7 + (-4) — 11 dB;
setting Table Table of corresponding relation between different modulation modes and AGC backoff values in system mod_boThe following were used:
modulation system AGC backoff
QPSK -11dB
16QAM -11dB
64QAM -11dB
TABLE 3
Supposing that only QPSK and 16QAM are supported on given resources, different modulation modes and AGC backoff value pairs in the system are searchedTable of correspondencemod_boAnd comparing AGC backoff values respectively corresponding to QPSK and 16QAM, wherein at the moment, because the 2 supported modulation modes respectively correspond to the same AGC backoff value and are all-11 dB, the AGC backoff of the system is set to-11 dB.
Example 3:
in this embodiment, there are 2 modulation modes in the system, and after the backoff value of the system is set, the modulation modes can be supported to change.
Then, on the basis of embodiment 2, it is assumed that the system originally supports 2 modulation schemes QPSK and 16QAM, respectively, and the AGC backoff of the system is set to min { -11, -13} -13 dB. However, since the service modulation mode supported by the system is changed to only support QPSK, and at this time, the table 3 is queried, and it is determined that AGC backoff corresponding to QPSK is-11 dB, the AGC backoff of the system is updated to-11 dB.
Fig. 4 is a receiving-end device according to an embodiment of the present invention, where the receiving-end device may be a terminal device provided with a receiver or a transceiver, and the receiving-end device may be configured to perform the steps of the method shown in fig. 3. The receiving end device comprises a receiver 31 and a processor 32.
It should be noted that, in practical applications, if the receiving end device is a terminal including a transceiver, the receiver may be located in the transceiver, which is not shown in the figure.
Specifically, the receiver 31 is configured to determine a modulation scheme used by a traffic signal sent by the sending end device.
The processor 32 is configured to determine at least one AGC power back-off parameter corresponding to the modulation scheme according to a preset lookup table, and perform receiving processing on the service signal according to the at least one AGC power back-off parameter; wherein, the preset look-up table records a plurality of modulation modes supported by the sending terminal equipment and AGC power back-off parameters corresponding to each modulation mode,
optionally, the receiver 31 is further configured to: before determining at least one AGC power back-off parameter corresponding to the modulation mode according to a preset look-up table, acquiring modulation information sent by the sending end equipment through a control channel, wherein the modulation information is used for indicating a plurality of modulation modes supported by the sending end equipment;
the processor 32 is further configured to: determining a peak value of a signal quantization noise ratio SQNR corresponding to each modulation mode in the multiple modulation modes; determining AGC power back-off parameters corresponding to corresponding modulation modes according to the SQNR peak value; and generating a preset lookup table according to the corresponding relation between the modulation mode and the AGC power back-off parameter.
Optionally, the processor 32 is configured to:
determining an initial backoff power value corresponding to the peak value of the SQNR and an offset value corresponding to the SQNR;
and determining the sum of the initial backoff power value and the offset value as an AGC power backoff parameter corresponding to the corresponding modulation mode.
Optionally, the processor 32 is specifically configured to:
determining a target AGC power back-off parameter of the at least one AGC power back-off parameter;
setting the target AGC power back-off parameter as the receiving power of the receiving end equipment;
and receiving and demodulating the service signal according to the target AGC power back-off parameter.
Optionally, the processor 32 is specifically configured to:
and determining the AGC power back-off parameter with the minimum value in the at least one AGC power back-off parameter as the target AGC power back-off parameter.
Optionally, the processor 32 is further configured to:
after the target AGC power back-off parameter is set as the receiving power of the receiving end equipment, the change of the modulation mode of the service signal sent by the sending end equipment is determined, the AGC power back-off parameter corresponding to the changed modulation mode is determined according to the preset lookup table, and the receiving power of the receiving end equipment is updated according to the determined AGC power back-off parameter.
Fig. 5 is a schematic diagram of a receiving end device according to an embodiment of the present invention. The receiving end device may be a terminal comprising a receiver or a transceiver, and the receiving end device may comprise a first determining module 21, a second determining module 22 and a receiving module 23.
The first determining module 21 may be configured to determine a modulation scheme used by a service signal sent by a sending end device.
The second determining module 22 may be configured to determine at least one AGC power backoff parameter corresponding to the modulation scheme according to a preset lookup table; the preset look-up table records a plurality of modulation modes supported by the sending end equipment and AGC power back-off parameters corresponding to each modulation mode.
The receiving module 23 may be configured to perform receiving processing on the traffic signal according to the at least one AGC power back-off parameter.
Optionally, the receiving end device further includes:
an obtaining module, configured to obtain, through a control channel, modulation information sent by the sending end device before determining at least one AGC power backoff parameter corresponding to the modulation mode according to a preset lookup table, where the modulation information is used to indicate multiple modulation modes supported by the sending end device;
A third determining module, configured to determine a peak value of a signal quantization noise ratio SQNR corresponding to each modulation scheme in the multiple modulation schemes;
determining AGC power back-off parameters corresponding to corresponding modulation modes according to the SQNR peak value;
and generating a preset lookup table according to the corresponding relation between the modulation mode and the AGC power back-off parameter.
Optionally, the second determining module 22 is configured to:
determining an initial backoff power value corresponding to the peak value of the SQNR and an offset value corresponding to the SQNR;
and determining the sum of the initial backoff power value and the offset value as an AGC power backoff parameter corresponding to the corresponding modulation mode.
Optionally, the second determining module 22 is specifically configured to:
determining a target AGC power back-off parameter of the at least one AGC power back-off parameter;
setting the target AGC power back-off parameter as the receiving power of the receiving end equipment;
and receiving and demodulating the service signal according to the target AGC power back-off parameter.
Optionally, the second determining module 22 is specifically configured to:
and determining the AGC power back-off parameter with the minimum value in the at least one AGC power back-off parameter as the target AGC power back-off parameter.
Optionally, the receiving end device further includes an update module,
if the second determining module 22 is further configured to: after the target AGC power back-off parameter is set as the receiving power of the receiving end equipment, determining that the modulation mode of a service signal sent by the sending end equipment is changed, and determining an AGC power back-off parameter corresponding to the changed modulation mode according to the preset query table;
then, the update module is configured to: and updating the receiving power of the receiving end equipment according to the determined AGC power back-off parameter.
Fig. 6 is a computer device according to an embodiment of the present invention. The computer arrangement comprises a processor 10 and a memory 20, wherein the processor 10 is adapted to implement the steps of the interaction method shown in fig. 1 when executing a computer program stored in the memory 20.
Alternatively, the processor 10 may be a central processing unit, an Application Specific Integrated Circuit (ASIC), one or more Integrated circuits for controlling program execution, a hardware Circuit developed by using a Field Programmable Gate Array (FPGA), or a baseband processor.
Optionally, the processor 10 may include at least one processing core.
Optionally, the electronic device further includes a Memory 20, and the Memory 20 may include a Read Only Memory (ROM), a Random Access Memory (RAM), and a disk Memory. The memory 20 is used for storing data required by the processor 10 in operation. The number of the memory 20 is one or more.
Further, an embodiment of the present invention also provides a computer-readable storage medium, which stores computer instructions, and when the computer instructions are executed on a computer, the steps of the interaction method shown in fig. 1 may be implemented.
In the embodiments of the present invention, it should be understood that the disclosed AGC-based signal processing method and apparatus can be implemented in other ways. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical or other form.
The functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be an independent physical module.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, all or part of the technical solutions of the embodiments of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions to enable a computer device, such as a personal computer, a server, or a network device, etc., or a Processor (Processor) to execute all or part of the steps of the methods of the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a Universal Serial Bus flash drive (USB), a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, and an optical disk.
The above embodiments are only used to describe the technical solutions of the present invention in detail, but the above embodiments are only used to help understanding the method of the embodiments of the present invention, and should not be construed as limiting the embodiments of the present invention. Variations or substitutions that may be readily apparent to one skilled in the art are intended to be included within the scope of the embodiments of the present invention.

Claims (11)

1. A signal processing method based on automatic gain control AGC is applied to receiving end equipment, and is characterized by comprising the following steps:
determining a modulation mode adopted by a service signal sent by sending end equipment;
determining at least one AGC power back-off parameter corresponding to the modulation mode according to a preset lookup table; the preset look-up table records a plurality of modulation modes supported by the sending end equipment and AGC power back-off parameters corresponding to each modulation mode;
receiving and processing the service signal according to the at least one AGC power back-off parameter, including:
determining the AGC power back-off parameter with the minimum value in the at least one AGC power back-off parameter as a target AGC power back-off parameter;
setting the target AGC power back-off parameter as the receiving power of the receiving end equipment;
receiving and demodulating the service signal according to the target AGC power back-off parameter;
before determining at least one AGC power back-off parameter corresponding to the modulation scheme according to a preset look-up table, the method further includes:
determining a peak value of a Signal Quantization Noise Ratio (SQNR) corresponding to a plurality of modulation modes supported by the sending end equipment and each modulation mode in the plurality of modulation modes, and an offset value corresponding to the peak value of the SQNR;
Determining an AGC power back-off parameter corresponding to each modulation mode according to the peak value of the SQNR corresponding to each modulation mode and the deviation value;
and generating a preset lookup table according to the corresponding relation between the modulation mode and the AGC power back-off parameter.
2. The method of claim 1, wherein the determining the multiple modulation schemes supported by the sending end device specifically includes:
and acquiring modulation information sent by the sending end equipment through a control channel, wherein the modulation information is used for indicating various modulation modes supported by the sending end equipment.
3. The method of claim 1, wherein determining the AGC power back-off parameter for each modulation scheme according to the peak SQNR value for each modulation scheme and the offset value comprises:
determining an initial backoff power value corresponding to the peak value of the SQNR;
and determining the sum of the initial backoff power value and the offset value as an AGC power backoff parameter corresponding to the corresponding modulation mode.
4. The method of claim 1, wherein after setting the target AGC power back-off parameter to the receive power of the receiving end device, the method further comprises:
Determining that the modulation mode of the service signal sent by the sending end device is changed;
determining AGC power back-off parameters corresponding to the changed modulation mode according to the preset look-up table;
and updating the receiving power of the receiving end equipment according to the determined AGC power back-off parameter.
5. A receiving-end device, comprising:
the receiver is used for determining a modulation mode adopted by a service signal sent by sending end equipment;
the processor is configured to determine at least one AGC power back-off parameter corresponding to the modulation scheme according to a preset lookup table, and perform receiving processing on the service signal according to the at least one AGC power back-off parameter, and includes: determining the AGC power back-off parameter with the minimum value in the at least one AGC power back-off parameter as a target AGC power back-off parameter; setting the target AGC power back-off parameter as the receiving power of the receiving end equipment; receiving and demodulating the service signal according to the target AGC power back-off parameter; the preset look-up table records a plurality of modulation modes supported by the sending end equipment and AGC power back-off parameters corresponding to each modulation mode;
Before determining at least one AGC power back-off parameter corresponding to the modulation scheme according to a preset look-up table, the processor is further configured to: determining a peak value of a Signal Quantization Noise Ratio (SQNR) corresponding to a plurality of modulation modes supported by the sending end equipment and each modulation mode in the plurality of modulation modes, and an offset value corresponding to the peak value of the SQNR; determining an AGC power back-off parameter corresponding to each modulation mode according to the SQNR peak value corresponding to each modulation mode and the offset value; and generating a preset lookup table according to the corresponding relation between the modulation mode and the AGC power back-off parameter.
6. The receiving-end device of claim 5,
the receiver is further configured to: and before determining at least one AGC power back-off parameter corresponding to the modulation mode according to a preset look-up table, acquiring modulation information sent by the sending end equipment through a control channel, wherein the modulation information is used for indicating a plurality of modulation modes supported by the sending end equipment.
7. The receiving-end device of claim 5, wherein the processor is configured to:
determining an initial backoff power value corresponding to the peak value of the SQNR;
And determining the sum of the initial backoff power value and the offset value as an AGC power backoff parameter corresponding to the corresponding modulation mode.
8. The receiving-end device of claim 5, wherein the processor is further configured to:
after the target AGC power back-off parameter is set as the receiving power of the receiving end equipment, the change of the modulation mode of the service signal sent by the sending end equipment is determined, the AGC power back-off parameter corresponding to the changed modulation mode is determined according to the preset lookup table, and the receiving power of the receiving end equipment is updated according to the determined AGC power back-off parameter.
9. A receiving-end device, comprising:
the first determining module is used for determining a modulation mode adopted by a service signal sent by sending end equipment;
a second determining module, configured to determine, according to a preset lookup table, at least one AGC power backoff parameter corresponding to the modulation scheme; the preset look-up table records a plurality of modulation modes supported by the sending end equipment and AGC power back-off parameters corresponding to each modulation mode;
a receiving module, configured to perform receiving processing on the service signal according to the at least one AGC power back-off parameter, including: determining the AGC power back-off parameter with the minimum value in the at least one AGC power back-off parameter as a target AGC power back-off parameter; setting the target AGC power back-off parameter as the receiving power of the receiving end equipment; receiving and demodulating the service signal according to the target AGC power back-off parameter;
A third determining module, configured to determine a peak value of a signal quantization noise ratio SQNR corresponding to multiple modulation modes supported by the sending end device and each of the multiple modulation modes, and an offset value corresponding to the peak value of the SQNR; determining an AGC power back-off parameter corresponding to each modulation mode according to the peak value of the SQNR corresponding to each modulation mode and the offset value; and generating a preset lookup table according to the corresponding relation between the modulation mode and the AGC power back-off parameter.
10. A computer arrangement, characterized in that the computer arrangement comprises a processor for implementing the steps of the method according to any one of claims 1-4 when executing a computer program stored in a memory.
11. A readable storage medium having stored thereon a computer program, characterized in that: the computer program realizing the steps of the method according to any one of claims 1-4 when executed by a processor.
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