CN102075214B - Power-line carrier communication system, terminal and power control method - Google Patents
Power-line carrier communication system, terminal and power control method Download PDFInfo
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Abstract
The invention relates to the technical field of communication, and discloses a power-line carrier communication system, a terminal and a power control method. In the invention, the power of a downstream signal is utilized to estimate the loss of a downstream link, and a transmitting power of a next transmission data is calculated according to a transmitting energy of a unit carrier, quantity of the unit carrier, the estimated loss and an adjusting value controlled by the closed-loop power. The loss estimated result of a received signal is approximately used as an estimation value of the loss of an upstream path so as to determine the transmitting power of an upstream signal. Therefore, when the quality of a transmission channel becomes worse, the transmitting power can be improved; and when the quality of the transmission channel becomes better, the transmitting power is maintained or reduced, and the communication reliability and the power application efficiency of a time division dual (TDD) system in the power-line carrier communication system can be improved.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a transmission power control technology.
Background
Time Division Duplex (TDD) is a common Duplex mode used in modern communication systems for separating the receiving and transmitting channels (or uplink and downlink). In a TDD communication system, different time slots of the same frequency carrier are used for reception and transmission as bearers of a channel, and the separation of the reception and transmission channels is ensured by time. Generally, a TDD scheme is used in a power line carrier communication system.
The existing low-voltage power line carrier communication system has the characteristics of obvious line attenuation and complex and variable noise interference, and belongs to a severe communication environment.
In order to improve the communication environment of the low-voltage power line carrier communication system, some low-voltage power line carrier communication systems maximize the transmitting power on the premise of meeting the preset level of electromagnetic field radiation in order to ensure the reliability of communication. For the case of terminals close to the concentrator, etc., the transmission power of this scheme is surplus to ensure reliable communication, and a part of power is wasted.
In some low-voltage power line carrier communication systems, a Receiving end feeds back a received Signal field Strength Indicator (RSSI) of a reference Signal (reference Signal/pilot Signal/Receiving Signal) to a transmitting end, and the transmitting end estimates the attenuation and noise level of a channel according to the received RSSI and adjusts the transmitting power.
However, since the RSSI is obtained by integrating the power in the digital domain and then back-stepping to the antenna port, the accuracy of the RSSI is affected by the disparity in the transmission characteristics of the back channel signal. The complex variability of noise interference of the low-voltage power line communication channel affects the composition of useful signal power and noise interference level in the RSSI, and reduces the precision of the RSSI for representing the signal quality.
In addition, the communication system generally has a plurality of selectable modulation modes and code rates, and the adjustment of the transmitting power is one of the modes of ensuring reliable communication and improving the power use efficiency; but the transmission power is not changed, and the modulation coding mode is adjusted to adapt to the change of the channel quality; or a combination of both, while allowing for adjustment of the modulation and coding scheme and the transmit power level. In the above scheme, the adjustment of the transmission power is performed only according to the feedback RSSI, which is inaccurate in precision, one-sidedness exists in the scheme, and the influence of the change of the modulation and coding scheme is not considered.
Disclosure of Invention
The invention aims to provide a power line carrier communication system, a terminal and a power control method, so that the transmitting power can adapt to the change of a transmission channel, and the communication reliability and the power use efficiency of the power line carrier communication system are improved.
In order to solve the above technical problem, an embodiment of the present invention provides a power control method in a power line carrier communication system, including the following steps:
the terminal estimates the loss of a downlink according to the power of the received downlink signal;
the terminal calculates and obtains the reference transmitting power of the next transmission data according to the transmitting energy of the unit carrier, the number of the unit carrier, the estimated loss and the adjustment value of the closed-loop power control;
and the terminal transmits the uplink signal by taking the smaller value of the reference transmission power and the preset maximum transmission power as the transmission power.
An embodiment of the present invention further provides a terminal in a power line carrier communication system, including:
a receiving module, configured to receive a downlink signal;
a loss estimation module, configured to estimate a loss of a downlink according to the power of the downlink signal received by the receiving module;
the closed-loop power control adjustment calculation module is used for calculating an adjustment value of closed-loop power control;
the transmission power calculation module is used for calculating reference transmission power of next transmission data according to the transmission energy of the unit carrier, the number of the unit carriers, the loss estimated by the loss estimation module and the adjustment value of closed-loop power control obtained by the closed-loop power control adjustment value acquisition module, and taking the smaller value of the reference transmission power and the preset maximum transmission power as the transmission power;
and the transmitting module is used for transmitting the uplink signal by the transmitting power output by the transmitting power calculating module.
An embodiment of the present invention further provides a power line carrier communication system, including a concentrator and the above terminal, where the concentrator includes: and the closed-loop power control adjusting value calculating module is used for calculating the adjusting value of the closed-loop power control and feeding the calculated adjusting value of the closed-loop power control back to the terminal.
Compared with the prior art, the implementation mode of the invention has the main differences and the effects that:
and estimating the loss of the downlink by using the power of the downlink signal, calculating the transmitting power of the next transmission data according to the transmitting energy of the unit carrier, the number of the unit carriers, the estimated loss and the adjustment value of the closed-loop power control, and transmitting the uplink signal by using the obtained transmitting power of the next transmission data. And when the obtained transmitting power of the next transmission data is greater than the preset maximum transmitting power, transmitting the uplink signal at the preset maximum transmitting power. Since in a TDD system, the loss of the downlink path approximates the loss of the uplink path. Therefore, the transmission power of the uplink signal is determined by approximating the loss estimation result of the received signal as an estimated value of the uplink path loss. So that when the quality of the transmission channel is deteriorated, the transmission power can be increased; when the transmission channel quality becomes good (the transmission power meets the reliability and the communication is surplus), the transmission power is maintained or reduced, and the communication reliability and the power utilization efficiency in the power line carrier communication system are improved.
Further, the adjustment value of the closed-loop power control is obtained by comparing a demodulation threshold with an actual measurement value of the signal quality characteristic quantity, wherein the demodulation threshold is determined according to a coding modulation mode to be adopted by the terminal for next data transmission, and the actual measurement value of the signal quality characteristic quantity is obtained by calculating the power of the uplink signal. The modulation coding mode of the terminal is embodied in the calculation of the transmitting power of the next data transmission, so that the control of the transmitting power not only considers the link loss, but also considers the influence of the change of the modulation coding mode, and the control precision of the transmitting power is further ensured.
Furthermore, the adjustment value of the closed-loop power control can be directly the adjustment value of the characterization quantity obtained by subtracting the actual measurement value of the characterization quantity from the demodulation threshold; the adjustment value of the characteristic value may be a value obtained by alpha filtering. The adjustment value of the alpha-filtered characteristic quantity is used as the adjustment value of closed-loop power control, so that the situations of measurement abnormity and the like of the signal quality characteristic quantity caused by sudden change of channel conditions can be effectively avoided.
Further, when the communication system employs open-loop power control, the adjustment value of the closed-loop power control is 0 or the latest updated value. The technical scheme of the invention is not only suitable for closed-loop power control, but also suitable for open-loop power control, thereby ensuring the wide application scene of the invention.
Drawings
Fig. 1 is a flowchart of a power control method in a power line carrier communication system according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of a power line carrier communication system according to a fourth embodiment of the present invention;
fig. 3 is a schematic diagram of a terminal structure in a power line carrier communication system according to a fourth embodiment of the present invention.
Detailed Description
In the following description, numerous technical details are set forth in order to provide a better understanding of the present application. However, it will be understood by those skilled in the art that the technical solutions claimed in the present application can be implemented without these technical details and with various changes and modifications based on the following embodiments.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
A first embodiment of the present invention relates to a power control method in a power line carrier communication system. Fig. 1 is a flowchart illustrating a power control method in the power line carrier communication system.
In step 110, the terminal estimates the downlink loss PL according to the power of the received downlink signal.
Specifically, in the power line carrier communication system, the smart meter terminal (in the present invention, simply referred to as a terminal) calculates an actual measurement value of the signal quality indicator by using a built-in data signal processor according to the power of a downlink signal (i.e., a signal transmitted by a concentrator) received by the smart meter terminal. The characteristic quantity may be a Signal to Noise Ratio (SNR) or a Signal to Interference plus Noise Ratio (SINR). Then, from the actual measurement of SNR or SINR, the loss PL of the downlink (from the concentrator to the smart meter terminal) is estimated. Those skilled in the art will appreciate that estimating the downlink PL from the SNR or SINR is a prior art and will not be described in detail herein.
In each embodiment of the present invention, a Time Division Duplex (TDD) mode is used for communication between a concentrator and a terminal of a power line carrier communication system.
The term "estimation" in the embodiments of the present invention means that an estimated value is calculated, and the estimated value is an approximation to an actual value.
Next, in step 120, the terminal receives the adjustment value f (i) for closed loop power control.
Step 120 may be omitted in some scenarios, such as the case described in the third embodiment.
Specifically, the concentrator calculates an actual measurement value of a characteristic quantity of the uplink signal quality according to the received uplink signal power, subtracts the actual measurement value of the characteristic quantity from a demodulation threshold of the terminal to obtain an adjustment value of the characteristic quantity, and directly sends the obtained adjustment value of the characteristic quantity as an adjustment value f (i) of closed-loop power control to the terminal. The demodulation threshold of the terminal is determined according to a coding modulation mode to be adopted by the terminal for next data transmission. And after receiving the uplink signal, the concentrator carries out signal estimation according to the uplink signal to obtain the estimated channel quality. Different working ranges are preset in the concentrator for different coding modulation modes (combination of modulation modes and code rates), and which coding modulation mode is selected when the channel quality falls into which working range.
That is, in the present embodiment, f (i) is an adjustment value of the token. If the characteristic quantity is SNR, the concentrator calculates the actual measurement value SNR of the SN R of the received signal through the processing of the digital signalmeasuredThe SNR is adjustedmeasuredAnd demodulation threshold SNRtargetA comparison is made, wherein SNRtargetAccording to the code modulation to be used for the next data transmissionAnd determining the mode. SNR is measuredt arg et-SNRmeasuredAdjustment value SNR as a characteristic quantityadjustedI.e. f (i) ═ SNRadjusted. The concentrator SNR this informationadjustedSignaling the terminal so that the terminal can be based on the SNRadjustedThe transmit power for the next data transmission is adjusted. Of course, the SNR, which is a characteristic of the signal quality, may be replaced by SINR. Signal quality characterizers, such as SNR, in various embodiments of the present inventionmeasured、SNRt arg etEtc., are all in dB.
Next, in step 130, the terminal transmits energy P according to the unit carrier0The number M of unit carriers, the estimated loss PL and the adjustment value f (i) of closed-loop power control, and the reference transmitting power (P) of the next transmission data is calculatedReference to(i))。
PReference to(i)＝10log10(M(i))+P0+α·PL+f(i)
Then, the method proceeds to step 140, where the terminal calculates the actual transmission power P (i) ═ min { P { (i) }MAX，PReference to(i) And transmitting the uplink signal by P (i).
Specifically, if the calculated reference transmission power of the next transmission data is less than or equal to the preset maximum transmission power PMAXIf so, the terminal transmits the uplink signal by taking the reference transmission function as the final transmission power; if the calculated reference transmitting power of the next transmission data is more than PMAXThen the terminal will PMAXAnd transmitting the uplink signal as final transmission power. Wherein, PMAXIs the maximum transmission power on the premise that a preset level of electromagnetic field radiation is met.
Step 130 and step 140 are combined and described by the formula:
P(i)＝min{PMAX，10log10(M(i))+P0+ α · PL + f (i) }, where P (i) denotes the transmit power of the ith transmission data, P0Represents the transmitted energy per carrier, 10log10(M (i)) represents unifying the number M of unit carriers into dB dimension, P in the formulaMAX、P0The units of PL and f (i) are all dB. Alpha is belonged to 0, 1]Is a configurable parameter, PL has been determined in step 110, f (i) has been obtained in step 120.
Since the transmission power of the next transmission data can be obtained by addition operation after all items are unified into the dB dimension, which is simple to implement, in the embodiment, the transmission energy of the unit carrier, the number of the unit carrier, the estimated loss, and the adjustment value of the closed-loop power control are unified into the dB dimension, so as to avoid increasing the calculation complexity. In addition, it can be understood that, in practical applications, the transmission power of the next transmission data may be calculated by multiplication between the transmission energy of the unit carrier, the number of the unit carriers, the estimated loss, and the adjustment value of the closed-loop power control, without unifying the transmission energy of the unit carrier, the number of the unit carriers, and the estimated loss as the values of the dB dimension.
Those skilled in the art will appreciate that the unit carrier may be a subband, a subcarrier, etc. If the terminal calculates the SNR (or SINR) according to the downlink signal, taking the subband as a unit, and further the deduced downlink loss PL is also taken as the unit, the terminal determines the demodulation threshold by the coding modulation method adopted by the terminal in the next data transmission, adds the estimated downlink loss by taking the subband as a unit, and adjusts the transmission power of the subband when the terminal transmits the next data. SNR fed back by the concentrator to the terminal in closed loop power controladjustedStill taking the sub-band as a unit, the terminal adjusts the sending power of the sub-band corresponding to the next data transmission.
It is not difficult to find that, in a TDD system, the loss of the downlink path approximates the loss of the uplink path. Therefore, the transmission power of the uplink signal is determined by approximating the loss estimation result of the received signal as an estimated value of the uplink path loss. So that the transmission power can be increased when the quality of the transmission channel deteriorates. When the transmission channel quality becomes good (the transmission power meets the reliability and the communication has surplus), the transmission power is maintained or reduced, and the communication reliability and the power utilization efficiency of the power line carrier communication system are improved.
And the modulation coding mode of the terminal is embodied in the calculation of the transmitting power of the next data transmission, so that the control of the transmitting power not only considers the link loss, but also considers the influence of the change of the modulation coding mode, and further ensures the control precision of the transmitting power.
A second embodiment of the present invention relates to a power control method in a power line carrier communication system. The second embodiment is improved on the basis of the first embodiment, and the main improvement lies in that:
in a first embodiment, the adjustment value f (i) for the closed loop power control is directly the demodulation threshold SNRtargetSubtracting the actual measured value SNR of the characterizing quantitymeasuredThe adjustment value SNR of the obtained characterization quantityadjusted. In the present embodiment, in order to avoid SNR measurement abnormality due to sudden change in channel condition, it is necessary to measure SNR with respect to the SNRadjustedAlpha filtering is performed. That is, the adjustment value f (i) of the closed loop power control is a value obtained by alpha filtering the adjustment value of the characteristic quantity.
Specifically, the method comprises the following steps: SNR obtained by the following formulaadjustedCarrying out alpha filtering:
wherein,representing the SNR after alpha filteringadjusted，Sadjusted(i) Means for subtracting the SNR calculated this time from the demodulation threshold determined this timemeasuredThe obtained adjustment value of the characteristic quantity, Sadjusted(i-1) represents subtracting the last calculated SNR from the last determined demodulation thresholdmeasuredCharacterization of the obtainedAn adjusted value of the amount. The concentrator will calculateBy signalling to the terminal, the terminal is based onAdjusting the transmit power of the next data transmission, i.e.Of course, the SNR, which is a characteristic of the signal quality, may also be replaced by SINR.
Furthermore, it will be appreciated that in certain other embodiments of the invention, other than for SNRadjustedAlpha filtering to obtain f (i), and SNRadjustedAfter further treatment, f (i) is obtained. For example, the SNR obtained by the last N times of calculationadjustedAveraging, and averaging the SNRadjustedAs an adjustment value for closed loop power control. Or SNR calculated in the last N timesadjustedOne maximum and one minimum are removed, averaged, and so on.
A third embodiment of the present invention relates to a power control method in a power line carrier communication system. The third embodiment is substantially the same as the first embodiment, and differs mainly in that:
in a first embodiment, the communication system employs closed loop power control; in the present embodiment, the communication system employs open loop power control. Therefore, in this embodiment, by setting the adjustment value f (i) of the closed-loop power control to 0 or the latest updated value, the following formula can be also used: p (i) ═ min { P { (i) }MAX，10log10(M(i))+P0+ α · PL + f (i) }, obtaining p (i) for transmitting the uplink signal. The implementation mode of the invention is not only suitable for closed-loop power control, but also suitable for open-loop power control, thereby ensuring wide application scenes of the invention. In other words, f (i) may take a constant value including 0.
It should be noted that the method embodiments of the present invention can be implemented in software, hardware, firmware, etc. Whether the present invention is implemented as software, hardware, or firmware, the instruction code may be stored in any type of computer-accessible memory (e.g., permanent or modifiable, volatile or non-volatile, solid or non-solid, fixed or removable media, etc.). Also, the Memory may be, for example, Programmable Array Logic (PAL), Random Access Memory (RAM), Programmable Read Only Memory (PROM), Read-Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), a magnetic disk, an optical disk, a Digital Versatile Disk (DVD), or the like.
A fourth embodiment of the present invention relates to a power line carrier communication system including a terminal and a concentrator. Fig. 2 is a schematic diagram of the structure of the power line carrier communication system. The structure of the terminal in fig. 2 is schematically shown in fig. 3. The terminal includes:
and the receiving module is used for receiving the downlink signal.
And the loss estimation module is used for estimating the loss of the downlink according to the power of the downlink signal received by the receiving module.
And the closed-loop power control adjustment value acquisition module is used for acquiring an adjustment value of closed-loop power control through analysis of the downlink signal.
A transmission power calculation module for calculating the transmission power P according to the transmission energy of the unit carrier0The number M of the unit carriers, the loss PL estimated by the loss estimation module and the adjustment value f (i) of the closed-loop power control obtained by the closed-loop power control adjustment value acquisition module are calculated to obtain the transmitting power of the next transmission data. The transmission power calculation module comprises the following sub-modules: dimension unification submodule for unifying P0M, PL and f (i) are unified as values in dB dimension. And the loss correction submodule is used for multiplying the PL with the unified dimension by a preset available parameter to obtain the corrected loss, and the available parameter is more than or equal to 0 and less than or equal to 1. A processing submodule for outputting P of the dimension unification submodule0M, f (i), adding the corrected losses output by the loss correction submodule to obtain the transmitting power of the next transmission data.
And the transmitting module is used for transmitting the uplink signal according to the transmitting power of the next transmission data calculated by the transmitting power calculating module. And the transmitting module transmits the uplink signal at the maximum transmitting power when the transmitting power of the next transmission data calculated by the transmitting power calculating module is greater than the preset maximum transmitting power. That is, the transmitting module transmits the uplink signal with P (i), P (i) ═ min { P { (i) }MAX，10log10(M(i))+P0+ α · PL + f (i) }. Wherein, P (i) represents the transmission power of the ith transmission data, and is 10log10(M (i)) represents unifying the number M of unit carriers into dB dimension, P in the formulaMAX、P0The units of PL and f (i) are all dB. Alpha is belonged to 0, 1]Is a configurable parameter.
Wherein the loss estimation module comprises the following sub-modules:
and the characteristic quantity operator module is used for calculating and obtaining an actual measured value of the characteristic quantity of the downlink signal quality according to the power of the received downlink signal.
And the estimation submodule is used for estimating the loss of the downlink according to the actual measurement value of the characterization quantity.
The concentrator in the power line carrier communication system of the present embodiment includes a closed-loop power control adjustment value calculation module, configured to calculate an adjustment value of closed-loop power control, and feed back the calculated adjustment value of closed-loop power control to the terminal in the present embodiment.
Specifically, the closed-loop power control adjustment value calculation module includes the following sub-modules:
and the characteristic quantity operator module is used for calculating and obtaining an actual measured value of the characteristic quantity of the quality of the uplink signal according to the power of the received uplink signal, wherein the characteristic quantity is SNR or SINR.
And the demodulation threshold acquisition submodule is used for determining the demodulation threshold of the terminal according to the coding modulation mode to be adopted by the next data transmission of the terminal.
And the characteristic quantity adjustment value operator module is used for subtracting the actual measurement value of the characteristic quantity of the uplink signal quality from the determined demodulation threshold to obtain an adjustment value of the characteristic quantity, and directly outputting the adjustment value of the characteristic quantity as the adjustment value of the closed-loop power control.
It is to be understood that the first embodiment is a method embodiment corresponding to the present embodiment, and the present embodiment can be implemented in cooperation with the first embodiment. The related technical details mentioned in the first embodiment are still valid in this embodiment, and are not described herein again in order to reduce repetition. Accordingly, the related-art details mentioned in the present embodiment can also be applied to the first embodiment.
A fifth embodiment of the present invention relates to a power line carrier communication system. The fifth embodiment is an improvement on the fourth embodiment, and the main improvement lies in that:
in a fourth embodiment, the closed-loop power control adjustment value calculation module in the concentrator directly uses the adjustment value of the token as the adjustment value of the closed-loop power control. In the present embodiment, an α filtering submodule is added in the closed-loop power control adjustment value calculation module, and performs α filtering on the adjustment value of the token quantity, and the adjustment value of the token quantity after the α filtering is output as the adjustment value of the closed-loop power control.
Specifically, the α filtering sub-module performs α filtering on the obtained adjustment value of the characterizing quantity by the following formula:
adjustment value of alpha filtered characterization quantity is (1-a) Sadjusted(i-1)+a＊Sadjusted(i) Wherein a is (0, 1)]，Sadjusted(i) The adjustment value of the characteristic quantity obtained by subtracting the actual measurement value of the characteristic quantity from the demodulation threshold determined at this time is shown, Sadjusted(i-1) represents the adjustment value of the token obtained by subtracting the actual measurement value of the token from the demodulation threshold determined last time. In the present embodiment, the token may be SNR or SINR, as well.
It is to be understood that the second embodiment is a method embodiment corresponding to the present embodiment, and the present embodiment can be implemented in cooperation with the second embodiment. The related technical details mentioned in the second embodiment are still valid in this embodiment, and are not described herein again in order to reduce repetition. Accordingly, the related-art details mentioned in the present embodiment can also be applied to the second embodiment.
A sixth embodiment of the present invention relates to a power line carrier communication system. The sixth embodiment is substantially the same as the fourth embodiment, and differs mainly in that: in a fourth embodiment, the communication system employs closed loop power control; in the present embodiment, the communication system employs open loop power control.
Therefore, in this embodiment, the closed-loop power control adjustment value calculation module sets the adjustment value f (i) of the closed-loop power control to 0 or the latest update value, or the closed-loop power control adjustment value acquisition module in the terminal does not acquire f (i) from the downlink signal and directly takes f (i) obtained from 0 or the latest as f (i) to be used this time. In the open-loop state, the transmitting module may also be enabled to transmit the uplink signal in P (i) ═ min { PMAX，10log10(M(i))+P0+α·PL+f(i)}。
It is to be understood that the third embodiment is a method embodiment corresponding to the present embodiment, and the present embodiment can be implemented in cooperation with the third embodiment. The related technical details mentioned in the third embodiment are still valid in this embodiment, and are not described herein again in order to reduce repetition. Accordingly, the related-art details mentioned in the present embodiment can also be applied to the third embodiment.
It should be noted that, each unit mentioned in each device embodiment of the present invention is a logical unit, and physically, one logical unit may be one physical unit, or may be a part of one physical unit, or may be implemented by a combination of multiple physical units, and the physical implementation manner of these logical units itself is not the most important, and the combination of the functions implemented by these logical units is the key to solve the technical problem provided by the present invention. Furthermore, the above-mentioned embodiments of the apparatus of the present invention do not introduce elements that are less relevant for solving the technical problems of the present invention in order to highlight the innovative part of the present invention, which does not indicate that there are no other elements in the above-mentioned embodiments of the apparatus.
While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (13)
1. A power control method in a power line carrier communication system, comprising the steps of:
the terminal estimates the loss of a downlink according to the power of the received downlink signal;
the terminal calculates and obtains the reference transmitting power of the next transmission data according to the transmitting energy of the unit carrier, the number of the unit carrier, the estimated loss and the adjustment value of the closed-loop power control;
the terminal transmits an uplink signal by taking the smaller value of the reference transmission power and the preset maximum transmission power as transmission power;
before the step of calculating the reference transmission power of the next transmission data, the method further comprises the following steps: the terminal receiving the adjustment value of the closed loop power control from the concentrator; wherein the concentrator calculates an adjustment value of the closed-loop power control by:
determining a demodulation threshold of the terminal according to a coding modulation mode to be adopted by the terminal for next data transmission;
the concentrator calculates and obtains an actual measurement value of a characteristic quantity of the uplink signal quality according to the received uplink signal power, and subtracts the actual measurement value of the characteristic quantity from the demodulation threshold to obtain an adjustment value of the characteristic quantity;
the concentrator directly takes the adjustment value of the characterization quantity as the adjustment value of the closed-loop power control; or, the concentrator performs alpha filtering on the adjustment value of the token quantity, and uses the adjustment value of the token quantity after the alpha filtering as the adjustment value of the closed-loop power control.
2. The power control method in the plc communication system according to claim 1, wherein the step of calculating, by the terminal, the reference transmission power of the next transmission data according to the transmission energy of the unit carrier, the number of the unit carriers, the estimated loss, and the adjustment value of the closed-loop power control, comprises the sub-steps of:
unifying the transmission energy of the unit carrier waves, the number of the unit carrier waves, the estimated loss and the adjustment value of closed-loop power control into numerical values of dB dimension, and multiplying the estimated loss by a preset configurable parameter, wherein the configurable parameter is more than or equal to 0 and less than or equal to 1;
and adding the transmission energy of the unit carrier waves with dB as a unit, the number of the unit carrier waves, the product of the estimated loss and the configurable parameter and an adjusting value of closed-loop power control to obtain the reference transmission power of the next transmission data.
3. The power control method in the power line carrier communication system according to claim 1, wherein the obtained adjustment value of the characteristic quantity is subjected to α filtering by the following formula:
adjusting value of alpha filtered characterization quantity ═ 1-a ═ Sadjusted(i-1)+a*Sadjusted(i) Wherein a is (0, 1)]，Sadjusted(i) The adjustment value of the characteristic quantity obtained by subtracting the actual measurement value of the characteristic quantity from the demodulation threshold determined at this time is shown, Sadjusted(i-1) represents the adjustment value of the token obtained by subtracting the actual measurement value of the token from the demodulation threshold determined last time.
4. The power control method in the plc communication system according to claim 1, wherein the step of the terminal estimating the loss of the downlink according to the power of the received downlink signal includes the sub-steps of:
the terminal calculates and obtains an actual measurement value of the characterization quantity of the downlink signal quality according to the power of the received downlink signal;
and the terminal estimates the loss of the downlink according to the actual measured value of the characterization quantity of the downlink signal quality.
5. The method according to claim 3 or 4, wherein the characteristic quantity is a signal-to-noise ratio or a signal-to-interference-plus-noise ratio.
6. The power control method in the power line carrier communication system according to claim 1, wherein when the communication system employs open loop power control, the adjustment value of the closed loop power control is 0 or the latest update value.
7. A terminal in a power line carrier communication system, comprising:
a receiving module, configured to receive a downlink signal;
a loss estimation module, configured to estimate a loss of a downlink according to the power of the downlink signal received by the receiving module;
the closed-loop power control adjustment value acquisition module is used for acquiring an adjustment value of closed-loop power control through analysis of the downlink signal;
a transmission power calculation module, configured to calculate a reference transmission power of next data transmission according to the transmission energy of the unit carrier, the number of the unit carriers, the loss estimated by the loss estimation module, and the adjustment value of the closed-loop power control obtained by the closed-loop power control adjustment value obtaining module, and use a smaller value of the reference transmission power and a preset maximum transmission power as the transmission power; the method comprises the steps that a terminal receives uplink signal power, wherein the adjustment value of closed-loop power control is obtained by a concentrator through determining a demodulation threshold of the terminal according to a coding modulation mode to be adopted by the terminal for next data transmission, calculating to obtain an actual measurement value of a characteristic quantity of the uplink signal quality according to the received uplink signal power, subtracting the actual measurement value of the characteristic quantity from the demodulation threshold to obtain an adjustment value of the characteristic quantity, and directly using the adjustment value of the characteristic quantity as the adjustment value of the closed-loop power control; or the concentrator performs alpha filtering on the adjustment value of the characteristic quantity, and the adjustment value of the characteristic quantity after the alpha filtering is used as the adjustment value of the closed-loop power control;
and the transmitting module is used for transmitting the uplink signal by the transmitting power output by the transmitting power calculating module.
8. The terminal in the power line carrier communication system according to claim 7, wherein the transmission power calculating module comprises the following sub-modules:
the dimension unification submodule is used for unifying the transmitting energy of the unit carrier waves, the number of the unit carrier waves, the estimated loss and the adjustment value of the closed-loop power control into numerical values of dB dimension;
the loss correction submodule is used for multiplying the loss after the unified dimension by a preset available parameter to obtain the corrected loss, and the available parameter is more than or equal to 0 and less than or equal to 1;
and the processing submodule is used for adding the transmitting energy of the unit carrier waves output by the dimension unification submodule, the number of the unit carrier waves, the adjustment value of the closed-loop power control and the corrected loss output by the loss correction submodule to obtain the transmitting power of the next transmission data.
9. The terminal in the power line carrier communication system according to claim 7, wherein the loss estimation module comprises the following sub-modules:
the characteristic quantity operator module is used for calculating and obtaining an actual measured value of the characteristic quantity of the downlink signal quality according to the power of the received downlink signal;
and the estimation submodule is used for estimating the loss of the downlink according to the actual measurement value of the characterization quantity.
10. The terminal in the plc communication system according to claim 9, wherein the characteristic quantity is a signal-to-noise ratio or a signal-to-interference-plus-noise ratio.
11. A power line carrier communication system comprising a terminal and a concentrator, wherein the concentrator comprises:
the closed-loop power control adjusting value calculating module is used for calculating an adjusting value of closed-loop power control and feeding the calculated adjusting value of the closed-loop power control back to the terminal;
the terminal includes:
a receiving module, configured to receive a downlink signal;
a loss estimation module, configured to estimate a loss of a downlink according to the power of the downlink signal received by the receiving module;
the closed-loop power control adjustment value acquisition module is used for acquiring an adjustment value of closed-loop power control through analysis of the downlink signal;
a transmission power calculation module, configured to calculate a reference transmission power of next data transmission according to the transmission energy of the unit carrier, the number of the unit carriers, the loss estimated by the loss estimation module, and the adjustment value of the closed-loop power control obtained by the closed-loop power control adjustment value obtaining module, and use a smaller value of the reference transmission power and a preset maximum transmission power as the transmission power;
the transmitting module is used for transmitting the uplink signal by the transmitting power output by the transmitting power calculating module;
the closed-loop power control adjustment value calculation module comprises the following sub-modules:
the characteristic meter operator module is used for calculating and obtaining an actual measured value of the characteristic quantity of the uplink signal quality according to the power of the received uplink signal;
a demodulation threshold obtaining submodule, configured to determine a demodulation threshold of the terminal according to a code modulation mode to be used for next data transmission of the terminal;
and the characteristic quantity adjustment value operator module is used for subtracting the actual measurement value of the characteristic quantity from the demodulation threshold to obtain an adjustment value of the characteristic quantity, and the adjustment value is directly used as the adjustment value of the closed-loop power control to be output.
12. A power line carrier communication system comprising a terminal and a concentrator, wherein the concentrator comprises:
the closed-loop power control adjusting value calculating module is used for calculating an adjusting value of closed-loop power control and feeding the calculated adjusting value of the closed-loop power control back to the terminal;
the terminal includes:
a receiving module, configured to receive a downlink signal;
a loss estimation module, configured to estimate a loss of a downlink according to the power of the downlink signal received by the receiving module;
the closed-loop power control adjustment value acquisition module is used for acquiring an adjustment value of closed-loop power control through analysis of the downlink signal;
a transmission power calculation module, configured to calculate a reference transmission power of next data transmission according to the transmission energy of the unit carrier, the number of the unit carriers, the loss estimated by the loss estimation module, and the adjustment value of the closed-loop power control obtained by the closed-loop power control adjustment value obtaining module, and use a smaller value of the reference transmission power and a preset maximum transmission power as the transmission power;
the transmitting module is used for transmitting the uplink signal by the transmitting power output by the transmitting power calculating module;
the closed-loop power control adjustment value calculation module comprises the following sub-modules:
the characteristic meter operator module is used for calculating and obtaining an actual measured value of the characteristic quantity of the uplink signal quality according to the power of the received uplink signal;
a demodulation threshold obtaining submodule, configured to determine a demodulation threshold of the terminal according to a code modulation mode to be used for next data transmission of the terminal;
the characteristic quantity adjustment value operator module is used for subtracting the actual measurement value of the characteristic quantity from the demodulation threshold to obtain an adjustment value of the characteristic quantity;
and the alpha filtering submodule is used for carrying out alpha filtering on the adjustment value of the token quantity output by the token quantity adjustment value operator module and outputting a filtering result as the adjustment value of the closed-loop power control.
13. The power-line carrier communication system according to claim 12, wherein the α filtering sub-module performs α filtering on the obtained adjustment value of the characterizing quantity by the following formula:
adjusting value of alpha filtered characterization quantity ═ 1-a ═ Sadjusted(i-1)+a*Sadjusted(i) Wherein a is (0, 1)]，Sadjusted(i) The adjustment value of the characteristic quantity obtained by subtracting the actual measurement value of the characteristic quantity from the demodulation threshold determined at this time is shown, Sadjusted(i-1) represents the adjustment value of the token obtained by subtracting the actual measurement value of the token from the demodulation threshold determined last time.
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| KR101986289B1 (en) * | 2012-12-10 | 2019-09-30 | 현대모비스 주식회사 | Integrated Receiving System for Vehicle |
| TWI530112B (en) * | 2012-12-21 | 2016-04-11 | 光寶電子（廣州）有限公司 | Power line communications device, power line communications system, and monitoring power method thereof |
| CN108541055B (en) | 2018-03-02 | 2019-09-20 | 珠海格力电器股份有限公司 | Power adjustment method and device and power adjustment method based on power line carrier |
| CN108521288A (en) * | 2018-04-08 | 2018-09-11 | 重庆物奇科技有限公司 | The adaptive approach in control hazard domain in power line carrier communication |
| CN108632975A (en) * | 2018-04-08 | 2018-10-09 | 重庆物奇科技有限公司 | A kind of method that dynamic power consumption is reduced in power line carrier communication |
| CN112769458B (en) * | 2020-12-31 | 2023-01-24 | 广东电网有限责任公司电力调度控制中心 | Power control method and device for power line communication |
| CN112788721B (en) * | 2021-02-23 | 2022-07-29 | 湖南斯北图科技有限公司 | Power control method for satellite Internet of things terminal |
| WO2024045523A1 (en) * | 2022-09-01 | 2024-03-07 | 青岛海信日立空调系统有限公司 | Air conditioning system and control method therefor |
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