A channel measurement method, device and communication equipment of a power line carrier signal

Abstract

The application relates to the technical field of power line carrier communication, and discloses a channel measurement method and device of a power line carrier signal and communication equipment, the method comprising the following steps: determining a first channel measurement result of each first subcarrier in a plurality of first subcarriers according to a preamble signal in the carrier signal; determining a target subcarrier according to a frequency band of a training symbol, the target subcarrier being a second subcarrier in a plurality of second subcarriers which overlaps with the plurality of first subcarriers; determining a target channel measurement result of the target subcarrier according to a first channel measurement result and a second channel measurement result corresponding to the target subcarrier, the second channel measurement result being determined based on the training symbol; and determining the target channel measurement result and a second channel measurement result of a second subcarrier which does not overlap with the plurality of first subcarriers as a channel measurement result for demodulating load data. The application can obtain a more accurate channel measurement result and improve demodulation performance.

Description

Technical Field

[0001] This invention relates to the field of power line carrier communication technology, and specifically to a channel measurement method, apparatus, and communication equipment for power line carrier signals. Background Technology

[0002] In Power Line Carrier (PLC) communication, after receiving the carrier signal from the transmitter, the receiver needs to obtain channel state information based on channel measurement results in order to correctly demodulate the data of each subcarrier. The carrier signal typically includes a preamble, a frame control (FC) signal, and payload (PL) data.

[0003] In next-generation communication protocols, payload data, preamble signals, and frame control signals may reside on different frequency bands. Training frames (TFs) are added before the payload data for channel measurement. The accuracy of channel measurement directly affects the demodulation accuracy of the payload data. However, channel measurements based on training frames are susceptible to noise and other factors, resulting in lower accuracy. Summary of the Invention

[0004] This invention provides a method, apparatus, and communication device for channel measurement of power line carrier signals, in order to solve the problem of low accuracy of channel measurement results based on training symbol computation.

[0005] In a first aspect, the present invention provides a channel measurement method for a power line carrier signal, the method comprising: determining a first channel measurement result for each of a plurality of first subcarriers based on a preamble signal in the carrier signal, wherein the carrier signal includes a preamble signal, training symbols, and payload data, and the plurality of first subcarriers are subcarriers corresponding to the frequency band of the preamble signal; determining a target subcarrier based on the frequency band of the training symbols, wherein the target subcarrier is a second subcarrier among a plurality of second subcarriers that overlaps with the plurality of first subcarriers, and the plurality of second subcarriers are subcarriers corresponding to the frequency band of the training symbols; determining a target channel measurement result for the target subcarrier based on the first channel measurement result and the second channel measurement result corresponding to the target subcarrier, wherein the second channel measurement result is the channel measurement result of the second subcarrier determined based on the training symbols; and determining the target channel measurement result and the second channel measurement result of the second subcarrier that does not overlap with the plurality of first subcarriers as channel measurement results for demodulating the payload data.

[0006] When determining the final channel measurement results of multiple second subcarriers in the training symbols, this invention also utilizes the first channel measurement results determined by OFDM symbols based on the preamble signal. This is equivalent to increasing the number of OFDM symbols participating in the calculation of channel measurement results in the second subcarriers that coincide with the first subcarriers, further reducing interference from factors such as noise, thereby obtaining more accurate channel measurement results for demodulation, and thus improving the demodulation performance of subsequent payload data.

[0007] In one optional implementation, the first channel measurement result includes a first signal-to-noise ratio (SNR), and the second channel measurement result includes a second SNR. Determining the target channel measurement result of the target subcarrier based on the first and second channel measurement results corresponding to the target subcarrier includes: determining the average of the first and second SNRs corresponding to the target subcarrier as the target channel measurement result.

[0008] In this embodiment, the target channel measurement results include the average of the first signal-to-noise ratio and the second signal-to-noise ratio, which can accurately characterize the degree of noise interference in the target frequency band. This provides a reliable basis for configuring demodulation parameters such as adaptive modulation and coding, subcarrier dynamic matching, and diversity copy mode switching, making the load demodulation strategy highly adaptable to the current channel environment.

[0009] In one optional implementation, the first channel measurement result includes a first channel estimation result, and the second channel measurement result includes a second channel estimation result. Determining the target channel measurement result of the target subcarrier based on the first channel measurement result and the second channel measurement result corresponding to the target subcarrier includes: performing phase compensation on the first channel estimation result corresponding to the target subcarrier to obtain a compensated first channel estimation result; and determining the average value of the compensated first channel estimation result and the second channel estimation result corresponding to the target subcarrier as the target channel measurement result.

[0010] In this embodiment, by performing phase compensation on the preamble channel estimation results, channel phase distortion caused by transmission delay and carrier phase deviation can be eliminated, ensuring phase alignment of the two sets of channel estimation results. Furthermore, by mean fusion, channel estimation noise can be further filtered out, resulting in a smooth and accurate time-frequency domain channel response. Channel equalization processing is performed on the target signal measurement results, including the average of the compensated first and second channel estimation results. This accurately compensates for amplitude attenuation and phase distortion caused by power line multipath transmission, effectively suppresses inter-symbol interference and inter-subcarrier interference, and improves the demodulation performance of the payload OFDM symbols.

[0011] In one optional implementation, phase compensation is performed on the first channel estimation result corresponding to the target subcarrier, including: performing phase compensation on the first channel estimation result based on the first phase rotation factor of the preamble signal and the second phase rotation factor of the training symbol.

[0012] In one optional implementation, the training symbols include multiple orthogonal frequency division multiplexing (OFDM) symbols. The target channel measurement result of the target subcarrier is determined based on the first channel measurement result and the second channel measurement result corresponding to the target subcarrier. This includes: determining the average of the channel measurement result of the target subcarrier determined based on the current OFDM symbol and the previous channel measurement result as the current channel measurement result. Specifically, when the current OFDM symbol is the first OFDM symbol, the previous channel measurement result is the first channel measurement result; when the current OFDM symbol is the last OFDM symbol, the current channel measurement result is determined as the target average of the first channel measurement result and the second channel measurement result, and the target average is determined as the target channel measurement result.

[0013] In this embodiment, calculating the average value in real time can reduce the storage space occupied by the channel measurement results.

[0014] In one optional implementation, the training symbols include multiple orthogonal frequency division multiplexing (OFDM) symbols. Before determining the target channel measurement result of the target subcarrier, the method further includes: determining multiple initial channel measurement results corresponding to the target subcarrier based on the multiple OFDM symbols, wherein the multiple initial channel measurement results correspond one-to-one with the multiple OFDM symbols; and determining the average value of the multiple initial channel measurement results as the second channel measurement result corresponding to the target subcarrier.

[0015] In an optional implementation, before determining the target channel measurement result of the target subcarrier, the method further includes: preprocessing multiple first channel measurement results using an edge filter to obtain preprocessed first channel measurement results; and determining the target channel measurement result of the target subcarrier based on the first channel measurement result and the second channel measurement result corresponding to the target subcarrier, including: determining the target channel measurement result based on the preprocessed first channel measurement result and the second channel measurement result corresponding to the target subcarrier.

[0016] Before determining the target channel measurement results, this invention uses an edge filter to process multiple first channel measurement results to achieve noise reduction and smoothing, effectively reducing the impact of noise and improving the robustness and accuracy of the final channel measurement results.

[0017] In an optional implementation, the method further includes: filtering the target channel measurement results and the second channel measurement results of the second subcarriers that do not overlap with the plurality of first subcarriers; determining the target channel measurement results and the second channel measurement results of the second subcarriers that do not overlap with the plurality of first subcarriers as channel measurement results for demodulating payload data, including: determining the filtered target channel measurement results and the filtered second channel measurement results as channel measurement results for demodulating payload data.

[0018] Secondly, the present invention provides a channel measurement device for a power line carrier signal. The device includes: a preamble measurement module, configured to determine a first channel measurement result for each of a plurality of first subcarriers based on a preamble signal in the carrier signal, wherein the carrier signal includes a preamble signal, training symbols, and payload data, and the plurality of first subcarriers are subcarriers corresponding to the frequency band of the preamble signal; a subcarrier determination module, configured to determine a target subcarrier based on the frequency band of the training symbols, wherein the target subcarrier is a second subcarrier among a plurality of second subcarriers that overlaps with the plurality of first subcarriers, and the plurality of second subcarriers are subcarriers corresponding to the frequency band of the training symbols; a training symbol measurement module, configured to determine a target channel measurement result for the target subcarrier based on the first channel measurement result and the second channel measurement result corresponding to the target subcarrier, wherein the second channel measurement result is the channel measurement result of the second subcarrier determined based on the training symbols; and a processing module, configured to determine the target channel measurement result and the second channel measurement result of the second subcarrier that does not overlap with the plurality of first subcarriers as channel measurement results for demodulating the payload data.

[0019] Thirdly, the present invention provides a communication device, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to perform the channel measurement method for power line carrier signals described in the first aspect or any corresponding embodiment thereof. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a PPDU frame according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the specific structure of a PPDU frame according to an embodiment of the present invention; Figure 3 This is a schematic diagram of another PPDU frame according to an embodiment of the present invention; Figure 4 This is a schematic diagram of another PPDU frame according to an embodiment of the present invention; Figure 5 This is a flowchart illustrating a channel measurement method for power line carrier signals according to an embodiment of the present invention. Figure 6 This is a flowchart illustrating another channel measurement method for power line carrier signals according to an embodiment of the present invention; Figure 7 This is a structural block diagram of a channel measurement device for power line carrier signals according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the hardware structure of a communication device according to an embodiment of the present invention. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] Orthogonal Frequency Division Multiplexing (OFDM) technology has been widely used in power line carrier communication (PLC) due to its significant advantages such as high spectral efficiency and strong resistance to multipath interference. OFDM technology effectively improves data transmission efficiency and reliability by decomposing a high-speed data stream into multiple low-speed sub-data streams and modulating them onto mutually orthogonal subcarriers for parallel transmission.

[0025] When different communication devices transmit data over power lines, the data to be transmitted generated by the transmitting (TX) device is first organized into logical frames by the upper-layer protocol. These logical frames are then encapsulated into Physical Protocol Data Unit (PPDU) frames and transmitted to the physical layer. The physical layer performs Orthogonal Frequency Division Multiplexing (OFDM) modulation on the PPDU frames and transmits them as a continuous carrier signal over the power line to the receiving (RX) device. In other words, the carrier signal (power line signal) is composed of PPDU frames. The communication device can be a smart meter, smart home device, or other terminal device.

[0026] like Figure 1 and Figure 2 A schematic diagram of the PPDU frame structure in the Power Line Carrier Communication Protocol (Q / GDW 12087.41—2020) is shown. In this communication protocol, the PPDU frame typically contains a preamble, a frame control signal (FC), and payload data (PL).

[0027] The preamble, frame control signal, and payload data share the same frequency band. The preamble is used for signal synchronization and channel measurement, while the frame control signal describes the basic information of the frame, including payload data length, modulation scheme, and frequency band. The data payload mainly includes the information that actually needs to be transmitted. The valid data (preamble, FC, and PL) section has a guard interval. This guard interval is typically a segment of signal from the end of the valid data section copied to the beginning, forming a cyclic prefix (CP) to combat multipath fading and inter-symbol interference.

[0028] When transmitting signals through a power line channel, in order to correctly demodulate the data of each subcarrier, the receiving end needs to accurately obtain the channel state information of the power line channel through channel measurement. The amplitude attenuation and phase offset information of each subcarrier can be obtained from the channel measurement results, thereby compensating for channel distortion.

[0029] The preamble, frame control signal, and payload data in the communication protocol use the same frequency band. Therefore, the channel parameters (such as channel estimation results and channel signal-to-noise ratio) obtained from channel measurements based on the preamble can be used for demodulation of subsequent frame control signals and payload data.

[0030] However, in next-generation communication protocols, payload data and preceding preamble and frame control signals may reside on different frequency bands, for example, such as Figure 3As shown, the frequency band of the payload data may be greater than the frequency bands of the preamble and frame control signals, such as... Figure 4 As shown, the frequency band of the payload data may be smaller than that of the preamble signal and the frame control signal, or the frequency band of the payload data may overlap with that of the preamble signal.

[0031] When the frequency bands are not entirely identical, the channel parameters obtained from channel measurements using preamble signals are no longer applicable to the payload data. Therefore, next-generation communication protocol frame structures incorporate training symbols (TFs) before the payload data for channel measurement. The accuracy of channel measurements directly affects the demodulation accuracy of the payload data; therefore, how to perform channel measurements based on TFs to obtain accurate channel parameters is a problem that urgently needs to be solved.

[0032] In view of this, the present invention provides a channel measurement method, apparatus and communication equipment for power line carrier signals. By using the channel measurement results of the preamble signal and the channel measurement results of the TF, the channel measurement results used for demodulating the payload data are jointly determined. Compared with the method of directly using the channel measurement results of the TF for demodulation, the amount of computation data is increased, which can further reduce interference and obtain more accurate channel measurement results, thereby improving the demodulation performance of subsequent payload data.

[0033] According to an embodiment of the present invention, a method for channel measurement of power line carrier signals is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a communication device such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0034] This embodiment provides a channel measurement method for power line carrier signals, which can be used in communication devices acting as receivers. Figure 5 This is a flowchart illustrating a channel measurement method for power line carrier signals according to an embodiment of the present invention, as shown below. Figure 5 As shown, the process includes the following steps: Step S501: Determine the first channel measurement result of each of the multiple first subcarriers based on the preamble signal in the carrier signal.

[0035] The carrier signal includes a preamble signal, training symbols, and payload data. Multiple first subcarriers are subcarriers corresponding to the frequency bands of the preamble signal. The first channel measurement result may include the channel estimation result and / or channel signal-to-noise ratio of the first subcarrier.

[0036] Specifically, the subcarrier numbering range of a communication protocol is fixed. For example, in a power line communication protocol, the subcarrier numbers range from 0 to 511, for a total of 512 subcarriers, each corresponding to a frequency. For instance, the multiple first subcarriers corresponding to the frequency band of a preamble signal could be subcarriers numbered 80 to 420. The relationship between subcarrier number (carrier ID), carrier frequency, and phase is shown in Tables 1 and 2. The carrier frequency refers to the center frequency of the corresponding subcarrier, and the phase number refers to the fixed phase value (index) assigned to the subcarrier, ranging from 0 to 15, used to generate the frequency domain sequence of the preamble signal.

[0037] Table 1 Leader Phase Table

[0038] Table 2 Leader Phase Table

[0039] For example, after receiving the carrier signal, the received carrier signal is subjected to frame synchronization processing. Then, the synchronization symbol can be determined based on the synchronization peak determined by the frame synchronization processing. Then, channel estimation can be performed on each first subcarrier based on the synchronization symbol. The channel estimation result is used as the first channel measurement result of the first subcarrier.

[0040] It should be understood that the preamble is a periodic sequence known to both the receiver and the transmitter, consisting of multiple synchronization patterns (SYNCPs). These SYNCPs provide synchronization signals to the receiver, helping it identify the start of a frame. The synchronization patterns are special OFDM symbols. The purpose of frame synchronization processing is to enable the receiver to accurately identify the start and end positions of each frame, thereby achieving correct data reception and processing. The process of frame synchronization processing can be found in relevant technologies and will not be elaborated upon here.

[0041] The basic principle of frame synchronization processing is as follows: when sending data frames, the sending end inserts specific synchronization codes or sequences into the frames according to certain formats and rules. The receiving end determines the frame boundaries by detecting these synchronization codes or sequences.

[0042] The essence of channel estimation is to estimate using the received synchronization symbol and the known local synchronization symbol, and then use the estimation result to compensate for subsequent data symbols. The channel estimation result obtained by least squares channel estimation can be shown in formula (1):

[0043] In the formula, Indicates the number is The channel estimation results for the subcarriers, , This indicates the number of the first subcarrier corresponding to the frequency band used by the preamble signal. , This indicates the last subcarrier number corresponding to the frequency band used by the preamble signal. The larger the subcarrier number, the higher the corresponding subcarrier frequency. In this invention, the frequency bands used for the preamble signal and frame control signal are fixed. and It is a fixed value; This is the result of performing a Fast Fourier Transform (FFT) on the received SYNCP symbols during frame synchronization. This is the frequency domain data of the locally stored SYNCP symbols. The Fast Fourier Transform (FFT) can convert time-domain signals into frequency-domain signals, making signal analysis and processing more convenient.

[0044] Since there are multiple SYNCP symbols in the preamble signal, the final channel estimation result of the first subcarrier is the average of the channel estimation results corresponding to each SYNCP symbol among the multiple SYNCP symbols.

[0045] The more SYNCP symbols there are, the more accurate the channel estimation results. This invention performs channel estimation using SYNCP symbols in the preamble signal, and obtains the channel estimation results for each first subcarrier by using the received SYNCP symbols and the local SYNCP symbols.

[0046] Step S502: Determine the target subcarrier based on the frequency band of the training symbols.

[0047] The target subcarrier is a second subcarrier that overlaps with multiple first subcarriers among multiple second subcarriers. The multiple second subcarriers are subcarriers corresponding to the frequency bands of the training symbols. The number of target subcarriers may be one or more.

[0048] Specifically, based on the frequency band of the training symbols, the numbers of multiple second subcarriers can be determined. If the number of the second subcarrier coincides with the number of multiple first subcarriers, then the second subcarrier is the target subcarrier.

[0049] For example, if the subcarrier number corresponding to the frequency range of the preamble signal is 80 to 420, and the subcarrier number corresponding to the frequency range of the training symbol is 40 to 300, then the subcarrier corresponding to the overlapping number 80 to 300 is determined as the target subcarrier.

[0050] The carrier signal also includes a frame control signal. Since the number of OFDM symbols in the preamble and frame control signals is fixed, successful synchronization allows the location of the OFDM symbol corresponding to the training symbol to be known. In next-generation communication protocols, the frame control signal includes information such as the modulation scheme, length, and frequency band of the payload data, as well as the frequency band information and length of the training symbols. The length of the training symbol refers to the number of OFDM symbols corresponding to it; a training symbol can include 2 to 10 OFDM symbols, with each OFDM symbol repeated. The length of the payload data refers to the number of OFDM symbols corresponding to it.

[0051] After determining the first channel measurement results, the frame control signal in the carrier signal can be demodulated based on these results. From the demodulated frame control signal, information such as the frequency band of the training symbols, the length of the training symbols, and the length of the payload data can be obtained. For example, the frame control signal can be compensated based on the first channel measurement results, and then the compensated frame control signal can be demodulated to obtain the frequency band and length of the training symbols. The demodulation process of the frame control signal can be referred to relevant technologies, and will not be elaborated here.

[0052] It should be noted that the training symbols also have a phase table similar to Tables 1 and 2. The phase number of the training symbols can be based on the preamble with a fixed value added, or a cyclic shift can be introduced. That is, the phase of the i-th subcarrier in the training symbol can be the phase of the preamble i+ k The phase of each subcarrier, i+ k If the value is greater than 511, then a circular shift is performed, where i = 0, 1, ..., 511. k It is a fixed value, such as 200.

[0053] Step S503: Determine the target channel measurement result of the target subcarrier based on the first channel measurement result and the second channel measurement result corresponding to the target subcarrier.

[0054] The second channel measurement result is the channel measurement result of the second subcarrier determined based on the training symbols. The second channel measurement result is of the same type as the first channel measurement result. If the first channel measurement result is a channel estimation result, then the second channel measurement result is also a channel estimation result; if the first channel measurement result is a channel signal-to-noise ratio (SNR), then the second channel measurement result is also a channel SNR; if the first channel measurement result includes both a channel estimation result and a channel SNR, then the second channel measurement result also includes both a channel estimation result and a channel SNR.

[0055] When calculating the channel measurement results of a subcarrier, the more OFDM symbols used, the more accurate the calculation results. However, the number of OFDM symbols in the training symbols is limited by the communication protocol, and increasing the number of OFDM symbols in the training symbols can affect the transmission rate. Compared to directly using the second channel measurement result as the channel measurement result of the second subcarrier, this invention integrates the first channel measurement result obtained based on the OFDM symbols in the preamble signal and the second channel measurement result obtained based on the OFDM symbols in the training symbols as the final channel measurement result of the second subcarrier. Without affecting data transmission efficiency, this increases the number of OFDM symbols involved in the calculation and reduces the impact of interference such as impulse noise, thereby achieving more accurate channel measurement and providing more reliable channel data for subsequent data demodulation.

[0056] In some examples, the average of the first channel measurement result corresponding to the target subcarrier and the second channel measurement result corresponding to the target subcarrier can be determined as the target channel measurement result.

[0057] In other examples, the first channel measurement result corresponding to the target subcarrier and the second channel measurement result corresponding to the target subcarrier can be weighted and fused to obtain the target channel measurement result. That is, the target channel measurement result can be determined by the following formula (2).

[0058]

[0059] In the formula, This indicates the target channel measurement results corresponding to the target subcarrier. This indicates the subcarrier number that overlaps with the first subcarrier. This represents the first channel measurement result corresponding to the target subcarrier. This represents the second channel measurement result corresponding to the target subcarrier. This represents the weighting coefficient of the first channel measurement result. The weighting coefficients represent the measurement results of the second channel. , and Determined based on signal-to-noise ratio.

[0060] For example, if the channel signal-to-noise ratio (SNR) of the preamble signal is greater than the channel SNR of the training symbols, then Greater than If the channel signal-to-noise ratio (SNR) of the preamble signal is less than that of the training symbol, then Greater than If the channel signal-to-noise ratio (SNR) of the preamble signal is equal to the channel SNR of the training symbols, then and same.

[0061] Step S504: The target channel measurement result and the second channel measurement result of the second subcarrier that does not overlap with the multiple first subcarriers are determined as the channel measurement result for demodulating the payload data.

[0062] Specifically, the channel measurement results of the second subcarrier are used to demodulate the payload data. If the second subcarrier is a subcarrier that coincides with the subcarrier corresponding to the preamble band, then the signal measurement results of the second subcarrier are the target channel measurement results determined based on the first channel measurement results and the second channel measurement results. If the second subcarrier does not coincide with the subcarrier corresponding to the preamble band, then the second channel measurement results corresponding to the second subcarrier are directly used to demodulate the payload data.

[0063] The channel measurement method for power line carrier signals provided in this embodiment determines the first channel measurement result of each of the multiple first subcarriers based on the preamble signal in the carrier signal, and determines the second subcarrier that overlaps with the first subcarrier from the multiple second subcarriers included in the training symbols. Then, when the second subcarrier overlaps with the first subcarrier, the target channel measurement result determined by fusing the first channel measurement result and the second channel measurement result is determined as the final channel measurement result of the second subcarrier for demodulating payload data. Only when the second subcarrier does not overlap with the first subcarrier is the second channel measurement result determined as the final channel measurement result of the second subcarrier for demodulating payload data.

[0064] When determining the final channel measurement results of multiple second subcarriers in the training symbols, this invention also utilizes the first channel measurement results determined by OFDM symbols based on the preamble signal. This is equivalent to increasing the number of OFDM symbols participating in the calculation of channel measurement results in the second subcarriers that coincide with the first subcarriers, further reducing interference from factors such as noise, thereby obtaining more accurate channel measurement results for demodulation, and thus improving the demodulation performance of subsequent payload data.

[0065] This embodiment also provides another method for channel measurement of power line carrier signals, which can be used in communication devices acting as receivers. Figure 6 This is a flowchart illustrating another channel measurement method for power line carrier signals according to an embodiment of the present invention, as shown below. Figure 6 As shown, the process includes the following steps: Step S601: Determine the first channel measurement result of each of the multiple first subcarriers based on the preamble signal in the carrier signal.

[0066] Please see details Figure 5 Step S501 of the illustrated embodiment will not be described again here.

[0067] Step S602: Determine the target subcarrier based on the frequency band of the training symbols.

[0068] Please see details Figure 5 Step S502 of the illustrated embodiment will not be described again here.

[0069] Step S603: Determine the target channel measurement result of the target subcarrier based on the first channel measurement result and the second channel measurement result corresponding to the target subcarrier.

[0070] For example, when the first channel measurement result includes a first signal-to-noise ratio and the second channel measurement result includes a second signal-to-noise ratio, the above step S603 specifically includes: determining the average of the first signal-to-noise ratio and the second signal-to-noise ratio corresponding to the target subcarrier as the target channel measurement result.

[0071] Among these, the target channel measurement result is also the signal-to-noise ratio (SNR). SNR is a key parameter measuring the relative strength of the effective components and noise components in a signal; it represents the ratio of signal power to noise power. Based on the subcarrier's SNR, the extent of interference from noise and other factors can be determined. A higher SNR value indicates a clearer signal, less noise interference, and more accurate channel estimation results.

[0072] In this embodiment, the target channel measurement results include the average of the first signal-to-noise ratio and the second signal-to-noise ratio, which can accurately characterize the degree of noise interference in the target frequency band. This provides a reliable basis for configuring demodulation parameters such as adaptive modulation and coding, subcarrier dynamic matching, and diversity copy mode switching, making the load demodulation strategy highly adaptable to the current channel environment.

[0073] When the first channel measurement result includes the first channel estimation result, and the second channel measurement result includes the second channel estimation result, the above step S603 may include: Step S6031: Perform phase compensation on the first channel estimation result corresponding to the target subcarrier to obtain the compensated first channel estimation result.

[0074] Specifically, when a communication device, acting as the transmitter, transmits a signal, each subcarrier has a fixed phase rotation factor. The phase compensation factors of the preamble signal and the training symbol are different. Ultimately, the subsequent payload data demodulation is performed based on the channel measurement results of the subcarriers of the training symbol. Therefore, it is necessary to first perform phase compensation on the channel measurement results of the preamble signal to make it consistent with the phase of the training symbol before averaging can be performed.

[0075] It should be understood that the carrier signal of a traditional communication protocol includes a preamble signal, a frame control signal, and payload data, and the phase rotation factors of each subcarrier in the preamble signal, frame control signal, and payload data are consistent. However, in the next-generation communication protocol of this invention, the carrier signal includes a preamble signal, a frame control signal, training symbols, and payload data. The phase rotation factors of the preamble signal and the frame control signal are consistent, and the phase rotation factors of the training symbols and the payload data are consistent. The reason why the phase rotation factors of the training symbols and the preamble signal are inconsistent is that the training symbols are also composed of repeated OFDM symbols, and their structure is similar to that of the preamble signal. If the phase rotation factors are the same, it is easy to cause missynchronization.

[0076] For example, the first channel estimation result can be phase-compensated based on the first phase rotation factor of the preamble signal and the second phase rotation factor of the training symbol. The compensated first channel estimation result can be shown in formula (3):

[0077] In the formula, This represents the first channel estimation result after compensation. This represents the first channel estimation result corresponding to the target subcarrier. Represents the natural constant. Represents the imaginary unit. This represents the difference between the first phase rotation factor and the second phase rotation factor. Given a value , Indicates the second phase rotation factor. This represents the first phase rotation factor.

[0078] Step S6032: The average value of the compensated first channel estimation result and the second channel estimation result corresponding to the target subcarrier is determined as the target channel measurement result.

[0079] The first channel measurement result may include a first signal-to-noise ratio and a first channel estimation result, and the second channel measurement result may include a second signal-to-noise ratio and a second channel estimation result. In this case, the target channel measurement result includes the average of the first signal-to-noise ratio and the second signal-to-noise ratio, as well as the average of the compensated first channel estimation result and the second channel estimation result.

[0080] It should be noted that in power line carrier communication systems, the analog front end typically includes an Automatic Gain Control (AGC) module, an analog filter, and an Analog-to-digital converter (ADC). The main function of the AGC is to dynamically adjust the gain to prevent the signal energy from being too high (oversaturation) or too low during ADC quantization, thus ensuring the accuracy of subsequent demodulation.

[0081] In next-generation power line carrier communication, the preamble signal and training symbol have different frequency bands, and the gain coefficients corresponding to the preamble signal and training symbols may be different. If the preamble signal corresponds to the first gain coefficient and the training symbol corresponds to the second gain coefficient, then when averaging the channel estimation result or the signal-to-noise ratio, it is necessary to adjust the channel estimation result (or signal-to-noise ratio) corresponding to the preamble signal so that the channel estimation result (or signal-to-noise ratio) corresponding to the preamble signal and the channel estimation result (or signal-to-noise ratio) corresponding to the training symbol are at the same benchmark, thus ensuring the accuracy of the target channel measurement result calculation.

[0082] In other words, before the step of determining the average of the first signal-to-noise ratio and the second signal-to-noise ratio corresponding to the target subcarrier as the target channel measurement result, the method further includes: adjusting the first signal-to-noise ratio according to the first gain coefficient and the second gain coefficient; at this time, the step of determining the average of the first signal-to-noise ratio and the second signal-to-noise ratio corresponding to the target subcarrier as the target channel measurement result specifically includes: determining the average of the adjusted first signal-to-noise ratio and the second signal-to-noise ratio corresponding to the target subcarrier as the target channel measurement result.

[0083] Wherein, the adjusted first signal-to-noise ratio = (second gain coefficient / first gain coefficient) × first signal-to-noise ratio.

[0084] Before step S6032 above, the method further includes: adjusting the compensated first channel estimation result according to the first gain coefficient and the second gain coefficient to obtain the adjusted first channel estimation result; at this time, step S6032 specifically includes: determining the average value of the adjusted first channel estimation result and the second channel estimation result corresponding to the target subcarrier as the target channel measurement result.

[0085] Wherein, the adjusted first channel estimation result = (second gain coefficient / first gain coefficient) × the compensated first channel estimation result.

[0086] By using the first gain coefficient corresponding to the preamble signal and the second gain coefficient corresponding to the training symbol to perform benchmark calibration on the first signal-to-noise ratio (or the compensated first channel estimation result), the adjusted first signal-to-noise ratio and the second signal-to-noise ratio are brought to the same power reference (or the adjusted first channel estimation result and the second channel estimation result are brought to the same power reference). Then, the mean operation is performed, which can eliminate the system deviation caused by the inconsistency of the operating frequency band and the difference in the transmit and receive link gain of the preamble signal and training symbol, improve the fusion accuracy of the subcarrier signal-to-noise ratio (channel estimation result), and further improve the accuracy of the target channel measurement result.

[0087] Specifically, the training symbols include multiple orthogonal frequency division multiplexing (OFDM) symbols, each OFDM symbol being transmitted by multiple second subcarriers. In some examples, step S603 above may include: Step a1: The average value of the channel measurement result of the target subcarrier determined based on the current orthogonal frequency division multiplexing symbol and the previous channel measurement result is determined as the current channel measurement result.

[0088] When the current orthogonal frequency division multiplexing symbol is the first orthogonal frequency division multiplexing symbol, the previous channel measurement result is the first channel measurement result.

[0089] Step a2: When the current orthogonal frequency division multiplexing symbol is the last orthogonal frequency division multiplexing symbol, the current channel measurement result is determined as the target average of the first channel measurement result and the second channel measurement result, and the target average is determined as the target channel measurement result.

[0090] Specifically, the channel measurement results include signal-to-noise ratio and / or channel estimation results. Whether the target channel measurement result is determined by averaging the signal-to-noise ratio or by averaging the channel estimation result (as described in steps S6031 and S6032 above), when calculating the average value, the first channel measurement result calculated in the preamble signal of the overlapping second subcarrier can be used as the initial value. Then, after calculating the second channel measurement result based on each OFDM symbol in the training symbols, it is averaged with the previous channel measurement result and used as the current channel measurement result to continue the calculation until the last OFDM symbol.

[0091] In this embodiment, calculating the average value in real time can reduce the storage space occupied by the channel measurement results.

[0092] In other embodiments, the method further includes, prior to determining the target channel measurement results for the target subcarrier: Step b1: Based on multiple orthogonal frequency division multiplexing symbols, determine multiple initial channel measurement results corresponding to the target subcarrier.

[0093] Among them, multiple initial channel measurement results correspond one-to-one with multiple OFDM symbols.

[0094] Step b2: The average value of multiple initial channel measurement results is determined as the second channel measurement result corresponding to the target subcarrier.

[0095] Specifically, in this embodiment, when calculating the average, the initial channel measurement results are first calculated based on all OFDM symbols in the training symbols to determine the second channel measurement results corresponding to the target subcarrier. Then, the first channel measurement results of the first subcarrier that coincides with the target subcarrier are averaged to obtain the target channel measurement results.

[0096] Step S604: The target channel measurement result and the second channel measurement result of the second subcarrier that does not overlap with the multiple first subcarriers are determined as the channel measurement result for demodulating the payload data.

[0097] Please see details Figure 5 Step S504 of the illustrated embodiment will not be described again here.

[0098] In this embodiment, by performing phase compensation on the preamble channel estimation results, channel phase distortion caused by transmission delay and carrier phase deviation can be eliminated, ensuring phase alignment of the two sets of channel estimation results. Furthermore, by mean fusion, channel estimation noise can be further filtered out, resulting in a smooth and accurate time-frequency domain channel response. Channel equalization processing is performed on the target signal measurement results, including the average of the compensated first and second channel estimation results. This accurately compensates for amplitude attenuation and phase distortion caused by power line multipath transmission, effectively suppresses inter-symbol interference and inter-subcarrier interference, and improves the demodulation performance of the payload OFDM symbols.

[0099] Optionally, before determining the target channel measurement result of the target subcarrier, the channel measurement method for the power line carrier signal further includes: preprocessing multiple first channel measurement results using an edge filter to obtain preprocessed first channel measurement results; in this case, step S603 specifically involves: determining the target channel measurement result based on the preprocessed first channel measurement result and the second channel measurement result corresponding to the target subcarrier.

[0100] In this embodiment, the channel measurement results may be uneven due to noise or interference. Before determining the target channel measurement results, the present invention uses an edge filter to process multiple first channel measurement results to achieve noise reduction and smoothing, effectively reducing the impact of noise and improving the robustness and accuracy of the final channel measurement results.

[0101] Optionally, the channel measurement method for power line carrier signals further includes: filtering the target channel measurement results and the second channel measurement results of the second subcarriers that do not overlap with the multiple first subcarriers; in this case, step S604 specifically involves: determining the filtered target channel measurement results and the filtered second channel measurement results as the channel measurement results used for demodulating the load data.

[0102] Specifically, the payload data is subjected to channel equalization and demodulation processing based on the target channel measurement results after filtering and the second channel measurement results after filtering.

[0103] In this embodiment, filtering the channel measurement results of the finally determined second subcarrier can smooth the channel measurement results and improve the accuracy of the channel measurement results of the overlapping second subcarriers.

[0104] This embodiment also provides a channel measurement device for power line carrier signals, which is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0105] This embodiment provides a channel measurement device for power line carrier signals, such as... Figure 7 As shown, it includes: The preamble measurement module 701 is used to determine the first channel measurement result of each of the multiple first subcarriers based on the preamble signal in the carrier signal, wherein the carrier signal includes the preamble signal, training symbols and payload data, and the multiple first subcarriers are subcarriers corresponding to the frequency band of the preamble signal; The subcarrier determination module 702 is used to determine the target subcarrier based on the frequency band of the training symbol, wherein the target subcarrier is a second subcarrier among a plurality of second subcarriers that overlaps with a plurality of first subcarriers, and the plurality of second subcarriers are subcarriers corresponding to the frequency band of the training symbol; The training symbol measurement module 703 is used to determine the target channel measurement result of the target subcarrier based on the first channel measurement result and the second channel measurement result corresponding to the target subcarrier, wherein the second channel measurement result is the channel measurement result of the second subcarrier determined based on the training symbols; The processing module 704 is used to determine the target channel measurement result and the second channel measurement result of the second subcarrier that does not overlap with the multiple first subcarriers as the channel measurement result for demodulating the payload data.

[0106] In some optional implementations, the first channel measurement result includes a first signal-to-noise ratio (SNR), the second channel measurement result includes a second SNR, and the training symbol measurement module includes: The first averaging unit is used to determine the average of the first signal-to-noise ratio and the second signal-to-noise ratio corresponding to the target subcarrier as the target channel measurement result.

[0107] In some optional implementations, the first channel measurement result includes a first channel estimation result, the second channel measurement result includes a second channel estimation result, and the training symbol measurement module includes: The compensation unit is used to perform phase compensation on the first channel estimation result corresponding to the target subcarrier to obtain the compensated first channel estimation result. The second averaging unit is used to determine the average of the compensated first channel estimation result and the second channel estimation result corresponding to the target subcarrier as the target channel measurement result.

[0108] In some optional implementations, the compensation unit includes: The compensation subunit is used to perform phase compensation on the first channel estimation result based on the first phase rotation factor of the preamble signal and the second phase rotation factor of the training symbol.

[0109] In some optional implementations, the training symbols include multiple orthogonal frequency division multiplexing symbols, and the training symbol measurement module includes: The first calculation unit is used to determine the average of the channel measurement result of the target subcarrier determined based on the current orthogonal frequency division multiplexing symbol and the previous channel measurement result as the current channel measurement result. When the current orthogonal frequency division multiplexing symbol is the first orthogonal frequency division multiplexing symbol, the previous channel measurement result is the first channel measurement result. The second calculation unit is used to determine the current channel measurement result as the target average of the first channel measurement result and the second channel measurement result when the current orthogonal frequency division multiplexing symbol is the last orthogonal frequency division multiplexing symbol, and to determine the target average as the target channel measurement result.

[0110] In some alternative implementations, the training symbols include multiple orthogonal frequency division multiplexing symbols, and the apparatus further includes: The first determining module is used to determine multiple initial channel measurement results corresponding to the target subcarrier based on multiple orthogonal frequency division multiplexing symbols, wherein the multiple initial channel measurement results correspond one-to-one with the multiple orthogonal frequency division multiplexing symbols; The second determining module is used to determine the average value of multiple initial channel measurement results as the second channel measurement result corresponding to the target subcarrier.

[0111] In some alternative embodiments, the apparatus further includes: The first filtering module is used to preprocess multiple first channel measurement results using an edge filter to obtain preprocessed first channel measurement results. The training symbol measurement module includes: The third calculation unit is used to determine the target channel measurement result based on the preprocessed first channel measurement result and the second channel measurement result corresponding to the target subcarrier.

[0112] In some alternative embodiments, the apparatus further includes: The second filtering module is used to filter the target channel measurement results and the second channel measurement results of the second subcarriers that do not overlap with the multiple first subcarriers. The processing module includes: The fourth calculation unit is used to determine the filtered target channel measurement results and the filtered second channel measurement results as the channel measurement results used for demodulating the payload data.

[0113] The channel measurement device for power line carrier signals provided in this embodiment of the invention can execute the channel measurement method for power line carrier signals provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects for executing the method. Further functional descriptions of the various modules and units described above are the same as in the corresponding embodiments described above, and will not be repeated here.

[0114] Figure 8 This is a schematic diagram of the structure of a communication device provided in an embodiment of the present invention.

[0115] The following is a detailed reference. Figure 8 The diagram illustrates a structural schematic suitable for implementing a communication device according to an embodiment of the present invention. The communication device may include a processor (e.g., a central processing unit, graphics processing unit, etc.) 801, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 802 or a program loaded from memory 808 into random access memory (RAM) 803. The random access memory 803 also stores various programs and data required for the operation of the communication device. The processor 801, ROM 802, and RAM 803 are interconnected via a bus 804. An input / output (I / O) interface 805 is also connected to the bus 804.

[0116] Typically, the following devices can be connected to the input / output interface 805: input devices 806 including, for example, a touchscreen, touchpad, keyboard, mouse, camera, microphone, accelerometer, gyroscope, etc.; output devices 807 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; memory devices 808 including, for example, magnetic tape, hard disk, etc.; and communication devices 809. Communication device 809 allows the communication device to exchange data with other devices wirelessly or via wired communication. Although Figure 8 Communication devices with various means are shown, but it should be understood that it is not required to implement or have all the means shown, and more or fewer means may be implemented or have instead.

[0117] In particular, according to embodiments of the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program carried on a non-transitory computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device 809, or installed from a memory 808, or installed from a read-only memory 802. When the computer program is executed by the processor 801, it performs the functions defined in the channel measurement method for power line carrier signals according to embodiments of the present invention.

[0118] Figure 8 The communication device shown is merely an example and should not be construed as limiting the functionality and scope of use of the embodiments of the present invention.

[0119] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as computer code that can be recorded on a storage medium, or implemented as computer code downloaded via a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and then stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium can also include combinations of the above types of memory. It is understood that computers, processors, microprocessor controllers, or programmable hardware include storage components capable of storing or receiving software or computer code. When the software or computer code is accessed and executed by the computer, processor, or hardware, the channel measurement method for power line carrier signals shown in the above embodiments is implemented.

[0120] A portion of this invention can be applied as a computer program product, such as computer program instructions, which, when executed by a computer, can invoke or provide the methods and / or technical solutions according to the invention through the operation of the computer. Those skilled in the art will understand that the forms in which computer program instructions exist in a computer-readable medium include, but are not limited to, source files, executable files, installation package files, etc. Correspondingly, the ways in which computer program instructions are executed by a computer include, but are not limited to: the computer directly executing the instructions, or the computer compiling the instructions and then executing the corresponding compiled program, or the computer reading and executing the instructions, or the computer reading and installing the instructions and then executing the corresponding installed program. Here, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible to a computer.

[0121] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A method for channel measurement of power line carrier signals, characterized in that, The method includes: Based on the preamble signal in the carrier signal, the first channel measurement result of each of the plurality of first subcarriers is determined, wherein the carrier signal includes the preamble signal, training symbols and payload data, and the plurality of first subcarriers are subcarriers corresponding to the frequency band of the preamble signal; Based on the frequency band of the training symbol, a target subcarrier is determined, wherein the target subcarrier is a second subcarrier among a plurality of second subcarriers that overlaps with the plurality of first subcarriers, and the plurality of second subcarriers are subcarriers corresponding to the frequency band of the training symbol; Based on the first channel measurement result and the second channel measurement result corresponding to the target subcarrier, the target channel measurement result of the target subcarrier is determined, wherein the second channel measurement result is the channel measurement result of the second subcarrier determined based on the training symbols; The target channel measurement result and the second channel measurement result of the second subcarrier that does not overlap with the plurality of first subcarriers are determined as the channel measurement result for demodulating the payload data.

2. The method according to claim 1, characterized in that, The first channel measurement result includes a first signal-to-noise ratio (SNR), and the second channel measurement result includes a second SNR. Determining the target channel measurement result of the target subcarrier based on the first and second channel measurement results corresponding to the target subcarrier includes: The average value of the first signal-to-noise ratio and the second signal-to-noise ratio corresponding to the target subcarrier is determined as the target channel measurement result.

3. The method according to claim 1, characterized in that, The first channel measurement result includes a first channel estimation result, and the second channel measurement result includes a second channel estimation result. Determining the target channel measurement result of the target subcarrier based on the first and second channel measurement results corresponding to the target subcarrier includes: Phase compensation is performed on the first channel estimation result corresponding to the target subcarrier to obtain the compensated first channel estimation result; The average of the compensated first channel estimation result and the second channel estimation result corresponding to the target subcarrier is determined as the target channel measurement result.

4. The method according to claim 3, characterized in that, The phase compensation of the first channel estimation result corresponding to the target subcarrier includes: Phase compensation is performed on the first channel estimation result based on the first phase rotation factor of the preamble signal and the second phase rotation factor of the training symbol.

5. The method according to any one of claims 1 to 4, characterized in that, The training symbols include multiple orthogonal frequency division multiplexing symbols. Based on the first channel measurement result and the second channel measurement result corresponding to the target subcarrier, the target channel measurement result of the target subcarrier is determined, including: The average of the channel measurement result of the target subcarrier determined based on the current orthogonal frequency division multiplexing symbol and the previous channel measurement result is determined as the current channel measurement result. When the current orthogonal frequency division multiplexing symbol is the first orthogonal frequency division multiplexing symbol, the previous channel measurement result is the first channel measurement result. When the current orthogonal frequency division multiplexing symbol is the last orthogonal frequency division multiplexing symbol, the current channel measurement result is determined as the target average of the first channel measurement result and the second channel measurement result, and the target average is determined as the target channel measurement result.

6. The method according to any one of claims 1 to 4, characterized in that, The training symbols include multiple orthogonal frequency division multiplexing symbols. Before determining the target channel measurement results of the target subcarrier, the method further includes: Based on the plurality of orthogonal frequency division multiplexing symbols, a plurality of initial channel measurement results corresponding to the target subcarrier are determined, wherein the plurality of initial channel measurement results correspond one-to-one with the plurality of orthogonal frequency division multiplexing symbols; The average value of the multiple initial channel measurement results is determined as the second channel measurement result corresponding to the target subcarrier.

7. The method according to any one of claims 1 to 4, characterized in that, Before determining the target channel measurement results of the target subcarrier, the method further includes: An edge filter is used to preprocess multiple first channel measurement results to obtain preprocessed first channel measurement results; Determining the target channel measurement result of the target subcarrier based on the first channel measurement result and the second channel measurement result corresponding to the target subcarrier includes: The target channel measurement result is determined based on the preprocessed first channel measurement result and the second channel measurement result corresponding to the target subcarrier.

8. The method according to any one of claims 1 to 4, characterized in that, The method further includes: The target channel measurement results and the second channel measurement results of the second subcarriers that do not overlap with the plurality of first subcarriers are filtered. The step of determining the target channel measurement result and the second channel measurement result of the second subcarrier that does not overlap with the plurality of first subcarriers as the channel measurement result for demodulating the payload data includes: The filtered target channel measurement result and the filtered second channel measurement result are determined as the channel measurement results used to demodulate the payload data.

9. A channel measurement device for power line carrier signals, characterized in that, The device includes: A preamble measurement module is used to determine the first channel measurement result of each of a plurality of first subcarriers based on a preamble signal in a carrier signal, wherein the carrier signal includes the preamble signal, training symbols and payload data, and the plurality of first subcarriers are subcarriers corresponding to the frequency band of the preamble signal; A subcarrier determination module is used to determine a target subcarrier based on the frequency band of the training symbol, wherein the target subcarrier is a second subcarrier among a plurality of second subcarriers that overlaps with the plurality of first subcarriers, and the plurality of second subcarriers are subcarriers corresponding to the frequency band of the training symbol; The training symbol measurement module is used to determine the target channel measurement result of the target subcarrier based on the first channel measurement result and the second channel measurement result corresponding to the target subcarrier, wherein the second channel measurement result is the channel measurement result of the second subcarrier determined based on the training symbols; The processing module is used to determine the target channel measurement result and the second channel measurement result of the second subcarrier that does not overlap with the plurality of first subcarriers as the channel measurement result for demodulating the payload data.

10. A communication device, characterized in that, include: A memory and a processor are communicatively connected, the memory storing computer instructions, and the processor executing the computer instructions to perform the channel measurement method for power line carrier signals according to any one of claims 1 to 8.

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