CN109639322B - Power line carrier communication system based on digital-analog combined frequency division and full duplex method - Google Patents
Power line carrier communication system based on digital-analog combined frequency division and full duplex method Download PDFInfo
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- CN109639322B CN109639322B CN201910089051.9A CN201910089051A CN109639322B CN 109639322 B CN109639322 B CN 109639322B CN 201910089051 A CN201910089051 A CN 201910089051A CN 109639322 B CN109639322 B CN 109639322B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B3/00—Line transmission systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
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Abstract
The invention provides a power line carrier communication system based on digital-analog combined frequency division and a full duplex method, which are suitable for PLC equipment to divide transmitting and receiving working frequency bands through an analog domain filter in a frequency band range from dozens of kilohertz to hundreds of megahertz, and simultaneously further refine two working frequency bands by utilizing digital domain frequency conversion and the filter, thereby realizing a multi-band and multi-bandwidth PLC full duplex technology.
Description
Technical Field
The invention belongs to the technical field of power communication of smart power grids, and particularly relates to a power line carrier communication system based on digital-analog joint frequency division and a full-duplex method, which are applied to the power line carrier system in a frequency range from dozens of kilohertz to dozens of megahertz.
Background
The power line carrier communication is a communication mode specific to a power system, and has natural network channel resources and application convenience. However, under the influence of basic characteristics such as a power grid topological structure, line characteristics, load characteristics and the like, a power line carrier channel has the characteristics of strong noise interference, large attenuation, complex impedance change and the like, and the channel characteristics have obvious frequency selectivity characteristics. In addition, noise, fading, etc. channel characteristics also exhibit geographic related variability and unpredictability.
At present, common PLC standard specifications at home and abroad comprise a narrow band (30-500kHz) and a wide band (2-30MHz), and a fixed working frequency (1-4) is generally adopted in a predetermined frequency band range, for example, G3 works at 40-500kHz and supports 3 bandwidths; the PRIME works at 40-90kHz, and the bandwidth is fixed; HOMEPLUG works at 2-30MHz, and the bandwidth is fixed; the physical layer of the national grid enterprise standard low-voltage power line broadband carrier communication technical specification supports 2 different bandwidths in 2-10 MHz. In a network, all PLC devices use the same operating frequency band and bandwidth, and interference from signals transmitted by their own devices cannot be avoided or distinguished when receiving signals of other devices, so that only a half-duplex mode is supported.
The requirement of the power distribution network service on real-time performance is high, and the standards and specifications supporting the half-duplex mode can be met by increasing the bandwidth and the speed. However, as the bandwidth is increased, the stability and reliability of the point-to-point communication are reduced, and the single-hop coverage is shortened. In some special power grid application scenarios, such as relay protection application services, when a fault occurs, the communication device is required to receive state information sent by other devices in the network and send the state information of the communication device to the other devices at the same time, so that the fault position can be located in the shortest time. In such a scenario, the half-duplex mode cannot meet the application requirements. In addition, practical application shows that the fixed-frequency working mode cannot adapt to complex, time-varying and regionally-differentiated power line channel environments, so that network coverage and service guarantee capabilities are poor, and the application of a PLC (programmable logic controller) technology in an intelligent power grid with higher time delay requirements such as relay protection and the like is restricted.
Disclosure of Invention
In order to solve the problems, the invention provides a power line carrier communication system based on digital-analog combined frequency division and a full duplex method, which are suitable for dividing a transmitting working frequency band and a receiving working frequency band by a filter in an analog domain in a frequency band range from dozens of kilohertz to hundreds of megahertz, and further refining the two working frequency bands by utilizing frequency conversion in a digital domain and the filter, thereby realizing a multi-band and multi-bandwidth PLC full duplex technology;
further, the system comprises a sending end and a receiving end;
the transmitting end comprises N interpolation filters, a digital domain up-converter and a DAC which are sequentially connected, wherein each interpolation filter finishes one-time up-sampling, a sampling frequency multiplication coefficient is associated with a coefficient of the interpolation filter, and the up-converter converts a baseband signal into a signal with a center frequency of ftxThe frequency band signal of (a);
the receiving end comprises an analog filter, an ADC, a down converter and N decimation filters which are connected in sequence, wherein the down converter converts a frequency band signal into a baseband signal, each decimation filter completes one down sampling, and a sampling down-conversion coefficient is associated with a decimation filter coefficient;
furthermore, the M interpolation filters are connected with the DAC through an up-converter to form a sending loop, the analog domain filter is connected with the down-converter through the ADC, the down-converter is further connected with the M decimation filters to form a receiving loop, wherein M is more than or equal to 0 and less than or equal to N;
in the transmitting loop, the up-converter is used for converting the baseband signal into a signal with a center frequency ftxThe sampling rate of the M interpolation filter signals is equal to the sampling frequency of the DAC;
in the receiving loop, the down converter is used for converting the central frequency to frxThe frequency band signal of (2) is converted into a baseband signal, and the sampling rate of the M decimation filter signals is equal to the sampling frequency of the ADC;
furthermore, the analog domain filter comprises a first analog filter, a second analog filter, a third analog filter and an alternative switch, wherein one end of the third analog filter is connected with the ADC, and the other end of the third analog filter is respectively connected with the first analog filter and the second analog filter through the alternative switch;
further, the system also comprises a PA, a PGA and a coupler, wherein the PA is used for connecting the DAC and the coupler, the PGA is used for connecting a third analog filter and an alternative switch, and the coupler is also used for simultaneously connecting the first analog filter, the second analog filter and the power line;
furthermore, the method divides two transmitting and receiving sub-bands from the frequency domain and filters the self-transmitted signal by arranging three filters on the analog domain and utilizing N digital domain filters on the digital domain, adjusts the center frequency of the transmitted signal, further thins the transmitting and receiving sub-bands divided by the analog domain into a plurality of smaller sub-bands, selects the best transmitting and receiving sub-bands according to the channel noise and attenuation conditions, and supports at least N +1 and at most 2NDifferent bandwidth configurationsThe device is supported to receive and send signals simultaneously, and full duplex communication is realized;
further, the method comprises the steps of:
step 2, after the center frequency of the baseband signal is shifted to a designated frequency through an up-converter, a DAC converts the digital signal into an analog signal;
step 3, injecting the amplified signal into a power line through a coupler after the amplified signal is amplified by a Power Amplifier (PA);
step 4, filtering the power line carrier signal extracted by the coupler through a first analog filter and a second analog filter, and sending an output result to the PGA through an alternative switch for amplification;
step 5, further filtering the signal by a third analog filter and converting the analog signal into a digital signal by an ADC (analog to digital converter);
step 6, down-conversion is carried out to obtain the center frequency frxThe band signal is converted into a baseband signal, M decimation filters down sample the signal, 1 decimation filter finishes one down sampling, and the rest N-M decimation filters skip unused;
further, the first analog filter has a passband in the range of [ f [ ]1s，f1t]Wherein f is1sIs the starting frequency, f1tIs the cut-off frequency;
further, the second analog filter has a passband in the range of [ f [ ]2s，f2t]Wherein f is2sIs the starting frequency, f2tIs the cut-off frequency;
the third analog filter has a passband of f3s，f3t]Wherein f is3sIs the starting frequency, f3tIs the cut-off frequency;
the starting frequency and the cut-off frequency of the three analog filters have the following relationship: f is not less than 03s≤f1s<f1t<f2s<f2t≤f3t；
Further, the third analog filter, if f3s＝0，f3tInfinity means that the third analog filter is not used;
further, for a single power line carrier device, the up-conversion sets the frequency ftxAnd down conversion set frequency frxThe specific relationship between the first analog filter and the second analog filter selected by the receiving end is as follows:
if the selection switch is turned to the first analog filter, ftx∈(f2s f2t)，f2s<ftx<f2t，frx∈(f1s f1t)，f1s<frx<f1t；
If the selector switch is toggled to the second analog filter, ftx∈(f1s f1t)，frx∈(f2s f2t)；
Further, the carrier device transmits a center frequency f of the signaltxIf the center frequency of the transmission signal of other equipment is not in the passband of the analog filter selected by the alternative switch of the receiving end of the equipment, the transmission signal can be normally received, and meanwhile, the transmission signal can be not influenced;
the invention has the following beneficial effects:
1. the first analog filter and the second analog filter designed on the analog domain are used for dividing the transmitting sub-band and the receiving sub-band on the frequency domain, and the analog filter capable of filtering the self-transmitted signal is selected through the one-out-of-two dial switch, so that a foundation is provided for realizing full duplex communication;
2. n interpolation/decimation filters are utilized in a digital domain, so that at least N +1 and at most 2N different bandwidth configurations can be supported, and flexibility is provided for bandwidth selection of a system;
3. the frequency of the up/down converter is configured on the digital domain, so that the center frequency of a transmitted signal can be adjusted, and flexibility is provided for the selection of the working frequency band of the system;
4. the transmitting and receiving sub-bands divided in the analog domain are further thinned into a plurality of smaller sub-bands by utilizing an up/down converter and an interpolation/extraction filter in the digital domain, the optimal transmitting and receiving sub-bands can be selected according to channel noise and attenuation conditions, and the communication stability and reliability are improved;
5. the frequency range of a transmitted signal is limited outside the passband range of the analog filter selected by the alternative switch in the analog domain by configuring an up-converter and an interpolation filter, and the frequency range of a received signal is limited within the passband range of the analog filter selected by the alternative switch in the analog domain by configuring a down-converter and an extraction filter, so that the receiving end can filter the transmitted signal from the equipment of the receiving end, and the equipment is supported to simultaneously receive and transmit the signal, thereby realizing full duplex communication;
6. the method not only supports point-to-point full duplex communication, but also is suitable for a multi-stage relay network, and can improve the network data transmission efficiency.
Drawings
Fig. 1 is a structural diagram of a power line carrier full duplex method based on digital-analog joint frequency division according to the present invention;
FIG. 2 is a graph of the frequency range of an analog filter in the method of the present invention;
FIG. 3 is a schematic diagram of peer-to-peer communication in the method of the present invention;
fig. 4 is a diagram illustrating an example of two-stage relay networking in the method of the present invention;
fig. 5 is a diagram of an example of a full-duplex power line carrier method based on digital-analog joint frequency division in the method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. On the contrary, the invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, in the following detailed description of the present invention, certain specific details are set forth in order to provide a better understanding of the present invention. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details.
The invention is further described with reference to the following figures and specific examples, which are not intended to be limiting. The following are preferred examples of the present invention:
as shown in fig. 1-5, the present invention provides a full duplex method for power line carrier communication based on digital-analog joint frequency division, and fig. 1 is a structural diagram of the full duplex method for power line carrier communication based on digital-analog joint frequency division according to the present invention. The transmitting end comprises N digital domain interpolation filters, 1 digital domain up-converter, 1 digital-to-analog converter (DAC) and 1 PA (Power Amplifier). Wherein, 1 interpolation filter finishes one-time up-sampling, and the sampling frequency multiplication coefficient is related to the interpolation filter coefficient; the up-converter converts the baseband signal to a center frequency ftxThe frequency band signal of (a); the digital-to-analog converter converts the digital signal to an analog signal, and the PA amplifies the analog signal. In a sending loop, a signal subjected to digital domain baseband processing firstly passes through M (M is more than or equal to 0 and less than or equal to N) interpolation filters (the rest N-M interpolation filters are skipped and unused), the sampling rate of the signal is increased to be consistent with the sampling frequency of a DAC (digital-to-analog converter), the center frequency of the baseband signal is moved to a specified frequency through an up-converter, then the DAC converts the digital signal into an analog signal, and finally the analog signal is amplified through a PA (power amplifier) and injected into a power line through a coupler.
The receiving end comprises three analog filters, a PGA (Programmable Gain Amplifier), a digital-to-analog converter (ADC), a down converter and N decimation filters. The analog filter filters analog signals, the PGA amplifies received signals, the ADC converts the analog signals into digital signals, and the down converter converts frequency bandsThe signal is converted into a baseband signal, 1 decimation filter completes one down-sampling, and the sampling down-conversion coefficient is related to the decimation filter coefficient. In a receiving loop, a power line carrier signal extracted by a coupler is filtered by a first analog filter and a second analog filter, the outputs of the two filters are sent to a PGA (programmable Gate array) through an alternative switch for amplification, and then are further filtered by a third analog filter, and an analog signal is converted into a digital signal by an ADC (analog to digital converter); in the digital domain, down-conversion will have a center frequency of frxThe signal of (a) band is converted into a baseband signal and down-sampled by M (0. ltoreq. M. ltoreq. N) decimation filters (the remaining N-M interpolation filters skip unused).
If the sampling rate of the DAC is f, the baseband sampling rate is
And the signal bandwidth is
Wherein, R is the total sampling frequency multiplication coefficient of digital domain interpolation filtering, k is the bandwidth coefficient, generally determined by the digital domain baseband algorithm and 0<k<1. The signal bandwidth is determined by the total sampling multiplication factor of the interpolation filter, under the condition of determined by the DAC device and the baseband algorithm. The total sampled multiplication factor of the interpolation filter is equal to the product of the respective multiplication factors of the M interpolation filters, i.e.
Wherein R isiIs the multiplication factor of the ith interpolation filter. If the sampling frequency multiplication coefficients of N interpolation filters are different, R has 2NWith different values and signal bandwidth also for application 2NA variety of different options; if the sampling frequency multiplication coefficients of the N interpolation filters are the same, R has N +1 different values, and the signal bandwidth also applies N +1 different choices. The receiving end extraction filter coefficients correspond to the transmitting end interpolation filter coefficients one to one. In addition, by setting the frequency f of the up-convertertxThe baseband signal can be shifted to any designated operating frequency band. Therefore, the bookThe power line carrier communication full-duplex method based on digital-analog combined frequency division can support frequency band selection and provides at least N +1 and at most 2NDifferent bandwidth configurations.
Fig. 2 shows the passband range of the analog domain filter of the full-duplex method for power line carrier communication based on digital-analog joint frequency division according to the present invention. The first analog filter has a passband of f1s，f1t]Wherein f is1sIs the starting frequency, f1tIs the cut-off frequency; the second analog filter has a passband of f2s，f2t]Wherein f is2sIs the starting frequency, f2tIs the cut-off frequency; the third analog filter has a passband of f3s，f3t]Wherein f is3sIs the starting frequency, f3tIs the cut-off frequency. The starting frequency and the cut-off frequency of the three analog filters have the following relationship: f is not less than 03s≤f1s<f1t<f2s<f2t≤f3t. For the third analog filter, if f3s＝0，f3tAnd ∞, this means that the third analog filter is not used. Up-conversion setting frequency f for single power line carrier devicetxAnd down conversion set frequency frxIn connection with the receiving end selecting either the first analog filter or the second analog filter. If the selection switch is turned to the first analog filter, ftx∈(f2s f2t) I.e. f2s<ftx<f2tAnd f isrx∈(f1s f1t) I.e. f1s<frx<f1t(ii) a If the selector switch is toggled to the second analog filter, ftx∈(f1s f1t) And f isrx∈(f2s f2t). Due to the centre frequency f of the signal transmitted by the carrier devicetxThe device's own transmit signal is filtered by the analog filter before entering its own receiving side PGA, not within the passband of its receiving side first stage analog filter. If the center frequency of the transmission signal of other equipment is not in the passband range of the first-stage analog filter at the receiving end of the equipment, the center frequency of the transmission signal is also filtered by the analog filter. If the other device sends informationThe center frequency of the signal is within the passband range of the first-stage analog filter at the receiving end of the equipment, so that the signal can be normally received, and meanwhile, the signal can be sent and received without being influenced, so that the signal can be transmitted and received simultaneously, namely, full duplex is realized.
Fig. 3 is a schematic diagram of point-to-point communication of a power line carrier device based on digital-analog joint frequency division according to the present invention. In scenario 1 of fig. 3, the PLC apparatus a selects the first analog filter and performs point-to-point communication with the PLC apparatus B selecting the second analog filter, that is, the alternative switch is shifted to the first analog filter; in scenario 2 of fig. 3, device a selects the second analog filter and performs point-to-point communication with PLC device B that selects the first analog filter, i.e., the alternative switch is toggled to the second analog filter. Therefore, for two PLC devices, point-to-point communication can only be performed if a different analog filter is selected.
Fig. 4 is an example of implementing a two-stage relay networking of the present invention. Due to channel noise, attenuation and other factors, direct communication between the master station and the slave station cannot be achieved, and two-stage relay is needed to establish a communication channel between the master station and the slave station. In a networking scene 1, a master station and a relay 2 adopt first analog filters, and a slave station and a relay adopt second analog filters; in networking scenario 2, the master station and the relay 2 employ second analog filters, and the slave station and the relay employ first analog filters. In this configuration, the master station can communicate with relay 1 but not with relay 2 (analog filter configuration cause) nor with the slave station (channel cause). The relay 1 cannot communicate directly with the slave (analog filter configuration and channel reasons) and the information must be forwarded through the relay 2. For a network with L (L ≧ 1) level relays, configuration can be made with reference to the example of FIG. 4: firstly, determining an analog filter selected by a master station; then, configuring the analog filter of the 1 st-stage relay device into a different filter with the master station; for the L-level (L is more than or equal to 2 and less than or equal to L) relay equipment, the analog filter is configured to be a different filter from the L-1 level relay equipment; finally, the analog filter of the secondary station is configured as a different filter from the L-th stage relay device.
FIG. 5 shows a full duplex method for power line carrier communication based on digital-analog joint frequency division corresponding to FIG. 1 of the present inventionExamples of (3). The transmitting end comprises two interpolation filters (namely N is 2), and the sampling frequency multiplication coefficient of each interpolation filter is 2. At the receiving end, the band-pass range of the first analog filter is 100 kHz-2.5 MHz, the band-pass range of the second analog filter is 3 MHz-10 MHz, and the third analog filter (namely f) is not used3s＝0，f3tInfinity). The receiving end is provided with two decimation filters, and the down-sampling coefficient of each decimation filter is also 2. The sampling rate of the ADC and the DAC is 4MHz, and the bandwidth coefficient k is 0.5. In this example, there are three cases for the total multiplication factor: r is 1, R is 2 and R is 4. Therefore, the system bandwidth B ═ 0.5 × 4MHz/R also has 3 different choices: 2MHz, 1MHz and 500 kHz.
Table 1 is an example of the operating frequency band given on the basis of fig. 5. The frequency group 1 corresponds to the first analog filter, and the working frequency bands are all in the passband range of the first analog filter; the frequency group 2 corresponds to a second analog filter, and the operating frequency bands thereof are all within the pass band range of the second analog filter. If the selector switch is toggled to the first analog filter, the center frequency and bandwidth of the received signal is set to one of frequency set 1 by configuring the digital domain down-conversion and decimation filters. Since the frequency range of the reception signal is within the pass band range of the first analog filter, normal reception is possible. Meanwhile, by configuring a digital domain up-converter and an interpolation filter, the center frequency and the bandwidth of the transmission signal are set as one of the frequency groups 2 as an operating frequency band. Since the operating frequency band is not within the passband of the first analog filter, it is filtered by the first analog filter before the PGA at its receiving end, so that it does not affect the receiving end to receive signals from other devices while transmitting signals. If the selector switch is toggled to the second analog filter, the center frequency and bandwidth of the received signal is set to one of frequency bins 2 by configuring the digital domain down-conversion and decimation filters. Since the frequency range of the reception signal is within the pass band range of the second analog filter, normal reception is possible. Meanwhile, by configuring a digital domain up-converter and an interpolation filter, the center frequency and the bandwidth of the transmission signal are set as one of the frequency groups 1 as an operating frequency band. Since the operating frequency band is not within the passband of the second analog filter, it is filtered by the second analog filter before the PGA at its receiving end, so that the receiving end is not affected by receiving signals from other devices while transmitting signals.
TABLE 1 working band example
The invention provides a power line carrier communication full-duplex method based on digital-analog combined frequency division, which divides a transmitting sub-band and a receiving sub-band on a frequency domain through a first analog filter and a second analog filter designed on an analog domain, selects the analog filter capable of filtering a self-transmitting signal through an alternative dial switch and provides a foundation for realizing full-duplex communication;
the center frequency of the transmitted signal can be adjusted by configuring the frequency of the up/down converter in the digital domain, and a minimum of N +1 and a maximum of 2 can be supported by using N interpolation/decimation filtersNDifferent bandwidth configurations are provided, so that flexibility is provided for bandwidth selection of the system;
the transmitting and receiving sub-bands divided in the analog domain are further thinned into a plurality of smaller sub-bands by utilizing the up/down converter and the interpolation/extraction filter in the digital domain, the optimal transmitting and receiving sub-bands can be selected according to channel noise and attenuation conditions, and the communication stability and reliability are improved.
The frequency range of a transmitted signal is limited outside the passband range of the analog filter selected by the alternative switch in the analog domain by configuring an up-converter and an interpolation filter, and the frequency range of a received signal is limited within the passband range of the analog filter selected by the alternative switch in the analog domain by configuring a down-converter and an extraction filter, so that the receiving end can filter the transmitted signal from the equipment of the receiving end, and the equipment is supported to simultaneously receive and transmit the signal, thereby realizing full duplex communication;
the method of the invention not only supports point-to-point full duplex communication, but also is suitable for a multi-stage relay network, and can improve the network data transmission efficiency.
The above-described embodiment is only one of the preferred embodiments of the present invention, and general changes and substitutions by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention.
Claims (8)
1. A power line carrier communication system based on digital-analog joint frequency division is characterized by comprising a sending end and a receiving end;
the transmitting end comprises N interpolation filters, an up-converter and a DAC which are sequentially connected, wherein each interpolation filter finishes one-time up-sampling, a sampling frequency multiplication coefficient is associated with a coefficient of the interpolation filter, and the up-converter converts a baseband signal into a signal with a center frequency of ftxThe frequency band signal of (a);
the receiving end comprises an analog domain filter, an ADC (analog to digital converter), a down converter and N extraction filters which are connected in sequence, wherein the down converter converts a frequency band signal into a baseband signal, each extraction filter completes one-time down sampling, a sampling down-conversion coefficient is associated with an extraction filter coefficient, M interpolation filters are connected with a DAC (digital to analog converter) through an up converter to form a sending loop, the analog domain filter is connected with the down converter through the ADC, the down converter is further connected with M extraction filters to form a receiving loop, and M is more than or equal to 0 and less than or equal to N;
in the transmitting loop, the up-converter is used for converting the baseband signal into a signal with a center frequency ftxThe sampling rate of the M interpolation filter signals is equal to the sampling frequency of the DAC;
in the receiving loop, the down converter is used for converting the central frequency to frxThe band signals of the M decimation filters are converted into baseband signals, the sampling rate of the signals of the M decimation filters is equal to the sampling frequency of the ADC, the analog domain filter comprises a first analog domain filter, a second analog domain filter, a third analog domain filter and an alternative switch, one end of the third analog domain filter is connected with the ADC, and the other end of the third analog domain filter is respectively connected with the first analog domain filter and the second analog domain filter through the alternative switch; by configuring the up-converter and the interpolation filter, the frequency of the transmitted signal is adjustedThe frequency range is limited outside the passband range of the analog domain filter selected by the analog domain alternative switch, and the down converter and the decimation filter are configured to limit the frequency range of the received signal within the passband range of the analog domain filter selected by the analog domain alternative switch.
2. The system of claim 1, further comprising a PA for connecting the DAC to the coupler, a PGA for connecting the third analog domain filter and the alternative switch, and a coupler for simultaneously connecting the first analog domain filter, the second analog domain filter, and the power line.
3. A full-duplex method for power line carrier communication based on digital-analog joint frequency division, based on the system of any one of claims 1-2, characterized in that the method divides two transmitting and receiving sub-bands from the frequency domain and filters the self-transmitted signal by arranging three filters in the analog domain and using N digital domain filters in the digital domain, adjusts the center frequency of the transmitted signal and further refines the transmitting and receiving sub-bands divided in the analog domain into a plurality of smaller sub-bands, selects the best transmitting and receiving sub-bands according to the channel noise and attenuation conditions, and supports at least N +1 and at most 2NDifferent bandwidth configurations support devices to receive and transmit signals simultaneously, and full duplex communication is realized.
4. A method according to claim 3, characterized in that the method comprises the steps of:
step 1, firstly, a signal processed by a digital domain baseband passes through M interpolation filters, the sampling rate of the signal is increased to be consistent with the sampling frequency of a DAC (digital-to-analog converter), M is more than or equal to 0 and less than or equal to N, and the rest N-M interpolation filters skip unused;
step 2, after the center frequency of the baseband signal is shifted to a designated frequency through an up-converter, a DAC converts the digital signal into an analog signal;
step 3, injecting the amplified signal into a power line through a coupler after the amplified signal is amplified by a Power Amplifier (PA);
step 4, filtering the power line carrier signal extracted by the coupler through a first analog domain filter and a second analog domain filter, and sending an output result to the PGA through an alternative switch for amplification;
step 5, further filtering the signal by a third analog domain filter and converting the analog signal into a digital signal by an ADC (analog to digital converter);
step 6, down-conversion is carried out to obtain the center frequency frxThe band signal of (1) is converted into a baseband signal, and the signal is down-sampled by M decimation filters, 1 decimation filter completes one down-sampling, and the rest N-M decimation filters skip unused.
5. The method of claim 4, wherein the first analog domain filter has a passband in the range of [ f [ ]1s，f1t]Wherein f is1sIs the starting frequency, f1tIs the cut-off frequency;
the second analog domain filter has a passband in the range of f2s，f2t]Wherein f is2sIs the starting frequency, f2tIs the cut-off frequency;
the third analog domain filter has a passband in the range of f3s，f3t]Wherein f is3sIs the starting frequency, f3tIs the cut-off frequency;
the starting frequency and the cut-off frequency of the three analog domain filters have the following relationship:
0≤f3s≤f1s<f1t<f2s<f2t≤f3t。
6. the method of claim 5, wherein the third analog domain filter is selected from the group consisting of f3s＝0，f3t∞, then the third analog domain filter is not used.
7. Method according to claim 6, characterized in that for a single power line carrier device, the up-conversion sets the frequency ftxAnd down conversion set frequency frxThe method is associated with the receiving end selecting the first analog domain filter or the second analog domain filter, and the specific relationship is as follows:
if the selection switch is turned to the first analog domain filter, ftx∈(f2s f2t)，f2s<ftx<f2t，frx∈(f1s f1t)，f1s<frx<f1t；
If the selection switch is shifted to the second analog domain filter, ftx∈(f1s f1t)，frx∈(f2s f2t)。
8. Method according to claim 7, characterized in that the carrier device transmits the centre frequency f of the signaltxIf the center frequency of the transmission signal of other equipment is not in the passband of the analog domain filter selected by the alternative switch of the equipment receiving end, the transmission signal can be normally received, and meanwhile, the transmission signal can not be influenced.
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| CN115065374A (en) * | 2022-04-27 | 2022-09-16 | 深圳市国电科技通信有限公司 | Power line carrier communication transceiver and power line carrier communication system |
| CN116724648A (en) * | 2023-03-31 | 2023-09-08 | 北京小米移动软件有限公司 | Capability reporting method and device |
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