CN104753564A - PLC (power-line communication) device with measuring mode and channel measuring method - Google Patents
PLC (power-line communication) device with measuring mode and channel measuring method Download PDFInfo
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Abstract
The invention relates to a PLC (power-line communication) device with a measuring mode and a channel measuring method. The PLC device sends and receives communication signals to allow communications, in the communication mode; in the measuring mode, the PLC device sends out a measurement signal and acquires and analyzes a channel output signal, thus allowing PLC channel measurement. The channel measuring method includes 1, setting the PLC device at the channel input end to the measuring mode, and allowing the PLC device to send out the measurement signal; 2, setting the PLC device at the channel output end to the measuring mode, and allowing the PLC device to acquire the channel output signal to obtain a received digital signal; 3, allowing the PLC device at the channel output end and/or a computer connected with the PLC device at the channel output end to analyze the received digital signal, thus acquiring channel measuring results; 4, allowing a display interface of the PLC device at the channel output end and/or the computer connected with the PLC device at the signal output end to display the channel measuring results.
Description
Technical field
The invention belongs to power line communication (Power-Line Communication, hereinafter referred to as PLC) field, be specifically related to a kind of the plc communication device and the channel measuring method that possess measurement pattern.
Background technology
PLC is that physical transport medium carries out information transmission with power line, have system lay simple, information transmission reliable and the advantage such as system being low cost.Compared to other wired communication system, PLC does not need rewiring, utilizes existing power line, as long as there is electricity, just can communicate, avoid the trouble of cable wiring manufacture, save high wiring cost.Compared to wireless communication system, it is reliable that PLC has transmission, need not consider the quorum sensing inhibitor problem caused because barrier blocks.PLC has wide application prospect in fields such as intelligent city, intelligent building, wired home and Internet of Things.
Though PLC has as above advantage, PLC physical layer signal transmission channel (hereinafter referred to as channel) is complicated and changeable, makes the installation and maintenance of PLC network very inconvenient.First, power line network is very complicated; Secondly, dynamics of channels changes; In addition, in existing situation, installation and maintenance personnel need to carry the instruments such as heavy expensive signal source, signal analyzer and oscilloscope to on-the-spot hand dipping channel, need operating personnel to have quite high professional skill; Finally, directly hand dipping carries out to power line (its voltage up to 220 volts, far more than the safe voltage of 36 volts) more dangerous.
Summary of the invention
Goal of the invention: the present invention is directed to above-mentioned prior art Problems existing and make improvement, namely first object of the present invention is to provide a kind of plc communication device possessing measurement pattern, and second object of the present invention is to provide the channel measuring method utilizing said apparatus.
Technical scheme: a kind of plc communication device possessing measurement pattern, possesses communication pattern and measurement pattern, carry out signal of communication transmission and reception in a communication mode, realize communication function; Carry out measuring-signal transmission, channel output signal collection and analysis in measurement mode, realize PLC channel measurement function, comprising:
Communication digital modulation module, in a communication mode, follows the communication protocol that plc communication network adopts, carries out digital modulation to communication data, produces communication digital signal and exports transmission front-end module to;
Measure digital signal generation module, in measurement mode, produce and measure digital signal and export transmission front-end module to;
Send front-end module, in a communication mode, the communication digital signal that received communication digital modulation module exports, carries out digital-to-analogue conversion, filtering and amplification process to communication digital signal, produces the signal of communication of simulation and export channel to; In measurement mode, receive the measurement digital signal measured digital signal generation module and export, digital-to-analogue conversion, filtering, amplification process are carried out to measurement digital signal, produces the measuring-signal of simulation and export channel to;
Receiving front-end module, channel output signal is amplified, filtering, analog-to-digital conversion process, obtain receiving digital signals, and receiving digital signals is transferred to communication digital demodulation blocks, measure digital signal processing module;
Communication digital demodulation blocks, in a communication mode, follows the communication protocol that plc communication network adopts, and carries out digital demodulation to the receiving digital signals that receiving front-end module exports, and recovers communication data;
Measure digital signal processing module, in measurement mode, the receiving digital signals that receiving front-end module exports is analyzed, obtains channel measurement, and channel measurement is sent to human-computer interaction module;
Human-computer interaction module, comprise control inerface and display interface, control inerface receive that operating personnel provide for arranging plc communication device mode of operation and arranging the configuration information of each module of plc communication device and be sent to control module, display interface display channel measurement and/or the operating state of plc communication device;
Control module, the configuration information that the configuration information exported according to human-computer interaction module and/or upper layer software (applications) provide, arranges mode of operation and each module of configuration plc communication device of plc communication device.
As a kind of a kind of preferred version possessing the plc communication device of measurement pattern disclosed by the invention, also comprise memory module, for storing the digital signal of each module of plc communication device and/or controling parameters and/or configuration information and/or channel measurement.
As a kind of a kind of preferred version possessing the plc communication device of measurement pattern disclosed by the invention, the plc communication device possessing measurement pattern of the present invention also comprises data interface module, external computer is connected to plc communication device by data interface module, thus plc communication device can be accessed, realize with plc communication device mutual.Here external computer general reference and is hereinafter described any has the personal computer of data cube computation, panel computer, cell phone or other suitable electronic equipment with plc communication device.
Preferably, in measurement mode, external computer obtains the state information and/or measurement digital signal of measuring digital signal generation module by data interface module, analyze and show it.
Preferably, in measurement mode, external computer obtains the receiving digital signals of receiving front-end module output by data interface module, analyzes and show it.
Preferably, in measurement mode, external computer obtains the channel measurement measured digital signal processing module and provide by data interface module, and carries out further optimization process to channel measurement, thus obtains channel measurement more accurately.
Preferably, in measurement mode, external computer to channel measurement carry out flexible, various, show targetedly, thus provide more powerful, friendly expansion display interface.
Preferably, external computer is provided for the configuration information arranging plc communication device mode of operation and arrange each module of plc communication device to control module by data interface module, thus provide more powerful, friendly expansion control inerface.
Preferably, external computer by the parameter/data for sending measuring-signal, collection/analysis channel output signal, display measurement result in data interface module deletion, rewriting or additional memory module, thus improves the flexibility of configuration.
Preferably, external computer can directly produce measurement digital signal, and the memory module of plc communication device is write by data interface module, in measurement mode, measure digital signal generation module and can read measurement digital signal from memory module, and export measurement digital signal to transmission front-end module, improve the flexibility that measuring-signal produces.
Preferably, memory module stores the log information of plc communication device in running; External computer can read the storage content of memory module by data interface module, then analyze targetedly, process.
A kind of channel measuring method, at channel input and the above-mentioned plc communication device possessing measurement pattern of channel output configuration, comprises the following steps:
(1), channel input plc communication device is set is in measurement pattern, make channel input plc communication device send measuring-signal, in order to encourage channel;
(2), channel output plc communication device is set is in measurement pattern, make channel output plc communication device gather channel output signal, obtain receiving digital signals;
(3), channel output plc communication device and/or the external computer that is connected with channel output plc communication device analyze receiving digital signals, obtains channel measurement;
(4), the display interface of channel output plc communication device and/or the external Computer display channel measurement that is connected with channel output plc communication device,
In above-mentioned steps, being parameter matching between each plc communication device, if use external computer, is parameter matching between so each plc communication device and corresponding external computer thereof.
As a kind of preferred version of a kind of channel measuring method disclosed by the invention, also comprise step (5): channel output plc communication device and/or the external Computer Storage channel measurement be connected with channel output plc communication device.
A kind of channel measuring method, at the above-mentioned plc communication device possessing measurement pattern of channel output configuration, comprises the following steps:
(1), arrange channel output plc communication device and be in measurement pattern, make the plc communication device of channel output gather channel output signal, obtain receiving digital signals, wherein channel output signal comprises interference signal and/or noise signal;
(2), channel output plc communication device and/or the external computer that is connected with channel output plc communication device analyze receiving digital signals, obtains the interference signal of channel and/or the measurement result of noise signal;
(3), the display interface of channel output plc communication device and/or this channel measurement of external Computer display of being connected with channel output plc communication device.
In above-mentioned steps, if step (2) or step (3) use the external computer be connected with channel output plc communication device to be connected, so its corresponding external computer of channel output plc communication device is parameter matching.
As a kind of preferred version of a kind of channel measuring method disclosed by the invention, also comprise step (4): channel output plc communication device and/or the external Computer Storage channel measurement be connected with channel output plc communication device.
Plc communication device disclosed by the invention, in a communication mode, utilize communication digital modulation module, send front-end module realize communication sending function, utilize receiving front-end module, communication digital demodulation blocks realize communications reception function; In measurement mode, utilize and measure digital signal generation module, transmission front-end module realizes measuring-signal sending function, wherein measuring-signal is for encouraging tested channel, utilizes receiving front-end module, measurement digital signal processing module, human-computer interaction module to realize the function such as channel measurement, display.
Plc communication device disclosed by the invention, only pays less cost and can realize measurement pattern.First, on the basis of communication pattern, only increasing measurement digital signal generation module, measurement digital signal processing module and human-computer interaction module can realize measurement pattern.Secondly, in transmitting portion, measuring digital signal generation module can shared portion software/hardware resource with the digital modulation module that communicates, as IFFT (inverse fast fourier transform) unit; Equally, at receiving unit, measuring digital signal processing module can shared portion software/hardware resource with the digital demodulation blocks that communicates, as FFT (fast Fourier transform) unit.
Beneficial effect: provided by the invention a kind of possess channel measurement pattern plc communication device and channel measuring method there is following beneficial effect:
(1), convenient and swift: based on this plc communication device and channel measuring method, the each network node of PLC can be made to possess display (with the storage/output) function of channel measurement function and measurement result, such PLC erection stage and maintenance phase can only utilize PLC network node (with external computer) to complete channel measurement, avoid traditional measurement method to need operating personnel to carry special instrument to carry out the drawback of hand dipping to scene, PLC is installed, safeguard and become convenient and swift.
(2), coefficient of safety is high: based on this plc communication device and channel measuring method, the each network node of PLC can be made to possess display (with the storage/output) function of channel measurement function and measurement result, no longer need operating personnel directly to measure power line (its voltage is up to 220 volts) during such channel measurement, thus refer to fail safe.
(3), measure flexible, with strong points: based on this plc communication device and channel measuring method, the each network node of PLC can be made to possess the function being connected external computer by data-interface, and the disposal ability utilizing computer powerful, flexible and general, the embody rule of channel measurement aspect is processed targetedly.
(4) user's service, is convenient to: based on this plc communication device and channel measuring method, the each network node of PLC can be made to possess display (with the storage/output) function of channel measurement function and measurement result, like this when PLC user carries out troublshooting, PLC network service provider can start the channel measurement function of PLC network node with mode remote guide users such as phones, such PLC network service provider judges possible failure cause by the channel measurement of user feedback, then provides user's service targetedly.
Marginal data
Fig. 1 is a kind of structural representation possessing the plc communication device of measurement pattern of the present invention.
Embodiment:
Below the specific embodiment of the present invention is described in detail.
The plc communication device possessing measurement pattern of the present invention possesses communication pattern and these two kinds of mode of operations of measurement pattern, carries out signal of communication transmission and reception in a communication mode, realizes the communication function meeting IEEE-1901 agreement; Carry out measuring-signal transmission, channel output signal collection and analysis in measurement mode, realize PLC channel measurement function, comprise the interference/noise power spectrum density of frequency-amplitude response and the channel measuring channel;
Plc communication device comprises:
Communication digital modulation module, in a communication mode, follow the IEEE-1901 communication protocol that plc communication network adopts, digital modulation is carried out to communication data, comprise scrambling, chnnel coding, intertexture, constellation mapping, OFDM modulation, produce communication digital signal and export transmission front-end module to;
Measure digital signal generation module, in measurement mode, produce and measure digital signal and export transmission front-end module to;
Send front-end module, in a communication mode, the communication digital signal that received communication digital modulation module exports, carries out digital-to-analogue conversion, filtering, up-conversion and amplification process to communication digital signal, produces the signal of communication of simulation and export channel to; In measurement mode, receive the measurement digital signal measured digital signal generation module and export, digital-to-analogue conversion, filtering, up-conversion and amplification process are carried out to measurement digital signal, produces the measuring-signal of simulation and export channel to;
Receiving front-end module, channel output signal is amplified, down-conversion, filtering and analog-to-digital conversion process, produce receiving digital signals, and receiving digital signals transferred to communication digital demodulation blocks, measure digital signal processing module;
Communication digital demodulation blocks, in a communication mode, follow the IEEE-1901 communication protocol that plc communication network adopts, digital demodulation is carried out to the receiving digital signals that receiving front-end module exports, recover communication data, data demodulates comprise synchronously, equilibrium, constellation demapping, deinterleaving, channel decoding, descrambling;
Measure digital signal processing module, in measurement mode, the receiving digital signals that receiving front-end module exports is analyzed, obtains channel measurement, and channel measurement is sent to human-computer interaction module;
Human-computer interaction module, comprise control inerface and display interface, control inerface receive that operating personnel provide for arranging plc communication device mode of operation and arranging the configuration information of each module of plc communication device and be sent to control module, display interface display channel measurement and/or the operating state of plc communication device;
Control module, the configuration information that the configuration information exported according to human-computer interaction module and/or upper layer software (applications) provide, arranges mode of operation and each module of configuration plc communication device of plc communication device.
Wherein, the control inerface of human-computer interaction module adopts mode switch to arrange the mode of operation of plc communication device, when operating personnel stir mode switch to " communication " or " measurement " state, human-computer interaction module sends to control module this information, control module arranges each module by control bus, makes plc communication device be in the communication corresponding with mode switch or measurement pattern.Mode switch forms a part for human-computer interaction module control inerface.
Illustrate for the frequency-amplitude characteristic measuring channel below.
In the present embodiment, measure digital signal generation module and produce measurement digital signal in the following manner in measurement mode:
The first step, N point IFFT (inverse fast fourier transform) is carried out to the frequency domain sequence S0 that length is N, wherein N value is that the positive integer power of 2 is so that the realization of IFFT, frequency domain sequence S0 is random in advance generation, namely S0 each element from a set (such as gather {+1 ,-1}) in advance random choose out, the complex time domain sequence S1 of the result of IFFT to be length be N, the S1 of such generation is base band OFDM signal, and its each subcarrier carries frequency domain sequence S0;
Second step, is cycled to repeat the corresponding input port exporting to and send front-end module with sample rate Fs by S1, so just obtain as measurement digital signal S2.Here, the implication being cycled to repeat output is: sequence S1 order exported successively, after last sample of sequence S1 exports, continues again to export from the first sample of sequence S1.Sample rate is Fs=k*B, wherein k be greater than 1 parameter, B is the bandwidth (unit: hertz) of tested channel.
In the present embodiment, send front-end module and produce measuring-signal as follows during measuring:
The first step, the sample rate arranging digital-to-analogue conversion is Fs, and the band connection frequency arranging low-pass filtering is more than or equal to B/2, cut-off frequency is less than or equal to Fs/2, obtains complex baseband signal S3 after carrying out digital-to-analogue conversion and low-pass filtering to measurement digital signal S2;
Second step, carries out up-conversion to S3, the reference frequency f of up-conversion
0value is the centre frequency of tested channel, and the signal after up-conversion is S4;
3rd step, carries out power amplification to S4, obtains measuring-signal S5, and it gives tested channel as pumping signal.
In the present embodiment, receiving front-end module acquisition and processing channel output signal in the following manner during measuring:
The first step, suitably amplifies channel output signal S6, then carries out quadrature frequency conversion and low-pass filtering, obtains complex baseband signal S7, wherein the reference frequency f of quadrature frequency conversion
0for the center frequency point of tested channel, the band connection frequency of low pass filter is more than or equal to B/2, cut-off frequency is less than or equal to Fs/2;
Second step, carries out analog-to-digital conversion respectively to the homophase of S7 and quadrature component, obtains complex sample sequences S8, and wherein analog-to-digital sample rate is the sampling rate Fs measuring digital signal generation module.S8 is the receiving digital signals that receiving front-end module exports.
In the present embodiment, measure digital signal processing module and carry out Multiple Channel Analysis in the following manner during measuring:
The first step, within the time period of channel measured signal excitation, intercepts from S8 the segmentation S9 that a length is N, and carries out N point FFT (fast Fourier transform) to S9, obtain the complex sequences S10 that length is N;
Second step, calculates S11 [n]=S10 [n]/S0 [n], wherein n=1,2 ... N, namely n-th element of sequence S11 is the business of the n-th element divided by n-th element of S0 of S10, and the length of sequence S11 is N.If channel measured signal S2 encouraged, then the absolute value of each element of S11 represents the amplitude response of channel on corresponding frequency, specifically: for n=1, and 2 ... N/2, abs (S11 [n]) respective channels is at frequency f
0the amplitude response of+(n-1) * Fs/N; And for n=N/2+1, N/2+2, N/2+3 ... N, abs (S12 [n]) respective channels is at frequency f
0the amplitude response of+(n-1-N) * Fs/N, wherein abs () represents the computing that takes absolute value; If the non-measured signal S2 of channel encouraged, the absolute value of each element of S11 represents the interference/noise power spectrum density of channel on corresponding frequency, specifically: for n=1, and 2 ... N/2, abs (S11 [n]) respective channels is at frequency f
0the interference/noise power spectrum density of+(n-1) * Fs/N; And for n=N/2+1, N/2+2, N/2+3 ... N, abs (S12 [n]) respective channels is at frequency f
0the interference/noise power spectrum density of+(n-1-N) * Fs/N.
In the present embodiment, the data that above-mentioned execution mode adopts, controling parameters are configurable, as measured digital signal generation module and measuring the frequency domain sequence S0 and length N thereof that use in digital signal processing module, send front-end module and controling parameters Fs and f used by receiving front-end module
0, the data that mode of operation and each module adopt, controling parameters are configured by control module.
It will be appreciated by those skilled in the art that, the present invention is not limited to above-mentioned execution mode, such as, measurement digital signal generation module of the present invention can also otherwise produce measurement digital signal, transmission front-end module of the present invention otherwise can also produce measuring-signal, receiving front-end module of the present invention can also otherwise acquisition and processing channel output signal, and measurement digital signal processing module of the present invention otherwise can also carry out Multiple Channel Analysis.
In the present embodiment, the display interface of human-computer interaction module is by one piece of liquid crystal display screen and corresponding software sharing, in measurement mode, liquid crystal display screen display measurement channel frequency-amplitude-response curve out, wherein abscissa represents frequency (unit: KHz), and ordinate represents amplitude response (unit: dBc); As mentioned before, the control inerface of human-computer interaction module comprises mode switch.
Preferably, a kind of plc communication device possessing measurement pattern also comprises memory module, for storing the digital signal of each module of plc communication device and/or controling parameters and/or configuration information.Such as, memory module
1. store the measurement digital signal measured digital signal generation module and produce,
2. store the receiving digital signals that receiving front-end module exports,
3. store the channel measurement measured digital signal processing module and export,
4. memory module can also store for sending measuring-signal, collection and analysis channel defeated
Go out signal and the controling parameters required for display measurement result and configuration information.
Preferably, plc communication device also comprises data interface module, and external computer is connected to plc communication device by data interface module, thus can access plc communication device, realizes with plc communication device mutual.
Preferably, in measurement mode, external computer obtains by data interface module the state information of measuring digital signal generation module and/or measures digital signal a kind of plc communication device possessing measurement pattern, analyzes and show it.
Preferably, in measurement mode, external computer obtains by data interface module the receiving digital signals that receiving front-end module exports to a kind of plc communication device possessing measurement pattern, analyzes and show it.
Preferably, a kind of plc communication device possessing measurement pattern in measurement mode, external computer obtains the channel measurement measured digital signal processing module and provide by data interface module, and further optimization process is carried out to channel measurement, thus obtain channel measurement more accurately.
Preferably, a kind of plc communication device possessing measurement pattern in measurement mode, external computer to channel measurement carry out flexible, various, show targetedly, thus provide more powerful, friendly expansion display interface.Such as, measurement result can with form, curve/broken line various ways display, and often kind of corresponding window of display mode, multiple window occurs on the computer screen with certain layout simultaneously, and such user only just can know the overall picture of measurement result by single-screen information.Again such as, user can carry out convergent-divergent by pulling mouse with the curve/broken line of right-click menu to screen display of clicking the mouse, as selected certain sub-band to amplify, thus the measurement result in this sub-band of more careful observation.
Preferably, external computer is provided for the configuration information arranging plc communication device mode of operation and arrange each module of plc communication device to control module by data interface module, thus provide more powerful, friendly expansion control inerface.
Preferably, external computer by the parameter/data for sending measuring-signal, collection/analysis channel output signal, display measurement result in data interface module deletion, rewriting or additional memory module, thus improves the flexibility of configuration.
Preferably, external computer can directly produce measurement digital signal, and the memory module of plc communication device is write by data interface module, in measurement mode, measure digital signal generation module and can read measurement digital signal from memory module, and export measurement digital signal to transmission front-end module, improve the flexibility that measuring-signal produces.
Preferably, memory module stores the log information of plc communication device in running; External computer can read the storage content of memory module by data interface module, then analyze targetedly, process.
Measuring digital signal generation module can the part software/hardware unit of multiplexed communications digital modulation module, measuring digital signal processing module can the part software/hardware unit of multiplexed communications digital demodulation blocks, such as, measuring digital signal generation module can the IFFT unit of multiplexed communications digital modulation module, measuring digital signal processing module can the FFT unit of multiplexed communications digital demodulation blocks, thus reduces the cost increase caused because of additional measurement modes as far as possible.
A kind of channel measuring method, at channel input and the above-mentioned plc communication device possessing measurement pattern of channel output configuration, comprises the following steps:
(1), channel input plc communication device is set is in measurement pattern, make channel input plc communication device send measuring-signal, in order to encourage channel;
(2), channel output plc communication device is set is in measurement pattern, make channel output plc communication device gather channel output signal, obtain receiving digital signals;
(3), channel output plc communication device and/or the external computer of plc communication device that is connected with channel output analyze receiving digital signals, obtains channel measurement;
(4), the display interface of channel output plc communication device and/or this channel measurement of external Computer display of plc communication device of being connected with channel output.
Namely channel input plc communication device in step (1) independently can produce measuring-signal according to configuration information; If it connects external computer, so it also can cooperate with coupled external computer and produce measuring-signal, namely as mentioned before, external computer produces measures digital signal, and the memory module of channel input plc communication device is write by data interface module, the measurement digital signal generation module of channel input plc communication device reads from memory module measures digital signal, and export measurement digital signal to transmission front-end module, send front-end module and produce and export measuring-signal.
Step (1) to step (4) by channel input plc communication device, channel output plc communication device, also may be performed respectively by the external computer be connected with channel input plc communication device and/or the external computer be connected with channel output plc communication device, therefore, need to guarantee that between each plc communication device, external computer be parameter matching.Such as, the present embodiment measures the frequency-amplitude response of channel, step (2) needs the sample rate using step (1) used, tested channel center frequency parameter, otherwise correctly can not gather channel output signal, step (3) needs the frequency domain sequence using step (1) used, otherwise can not correct measurement channel frequency-amplitude response, step (4) needs to use step (1) and step (2) sample rate used, tested channel center frequency parameter, otherwise can not frequency axis coordinate figure correctly in calculated rate-amplitude-response curve, therefore channel input plc communication device, channel output plc communication device, and the possible external computer be connected with channel input plc communication device and/or the sample rate of external computer that is connected with channel output plc communication device, tested channel center frequency, frequency domain sequence is equal.
Preferably, step (5) is also comprised: channel output plc communication device and/or the external Computer Storage channel measurement be connected with channel output plc communication device.
A kind of channel measuring method, at the above-mentioned plc communication device possessing measurement pattern of channel output configuration, comprises the following steps:
(1), arrange channel output plc communication device and be in measurement pattern, make channel output plc communication device gather channel output signal, obtain receiving digital signals, channel output signal comprises interference signal and/or noise signal;
(2), channel output plc communication device and/or the external computer that is connected with channel output plc communication device analyze receiving digital signals, obtains the interference signal of channel and/or the measurement result of noise signal;
(3), the display interface of channel output plc communication device and/or this channel measurement of external Computer display of being connected with channel output plc communication device;
If step (2) or step (3) use the external computer be connected with channel output plc communication device, so step (1) is performed with the external computer be connected with channel output plc communication device to step (3) respectively by channel output plc communication device, therefore, be parameter matching between the external computer needing to guarantee that channel output plc communication device is connected with channel output plc communication device.Such as, the present embodiment the method measures the interference/noise power spectrum density of channel, step (2) needs the employing rate using step (1) used, tested channel width parameter, otherwise correctly can not obtain the interference signal of channel and/or the measurement result of noise signal, step (3) needs the sample rate using step (1) used, tested channel center frequency parameter, otherwise the frequency axis coordinate figure that can not correctly calculate in interference/noise power spectrum density curve, therefore the sample rate of external computer that is connected with channel output plc communication device of channel output plc communication device, tested channel center frequency and bandwidth are equal.
Preferably, step (4) is also comprised: channel output plc communication device and/or the external Computer Storage channel measurement be connected with channel output plc communication device.
Between the plc communication device of transmitting terminal of the present invention and receiving terminal, and the parameter between plc communication device and coupled external computer has multiple matching way.Such as: first kind of way, plc communication device comprises start acquiescence when dispatching from the factory, that receiving terminal and transmitting terminal match measurement parameter, in measuring process, the plc communication device of channel input and channel output all uses start default parameters, as plc communication device is connected with external computer, so external computer also uses the start default parameters of plc communication device; The second way, if configurating channel input plc communication device uses non-default parameter to send, so also need configurating channel output plc communication device and the external computer that is connected with channel output plc communication device uses the running parameter mated with channel input plc communication device.The plc communication device of channel input and channel output and the configuration mode of external computer operation parameter both can be the same or different, the plc communication device of channel input and channel output and the running parameter of external computer both can by manually having arranged, also can by software design patterns.
Above embodiments of the present invention are elaborated.But the present invention is not limited to above-mentioned execution mode.It will be appreciated by those skilled in the art that, technical conceive of the present invention can also be applied to other communications field, adopt technical conceive of the present invention, on the communicator in other field, additional measurement modes can realize the communicator possessing this field channel measurement function, and is not limited in plc communication field.In the ken that those skilled in the art possess, technical scheme of the present invention can also make a variety of changes under the prerequisite not departing from present inventive concept.
Claims (16)
1. possess a plc communication device for measurement pattern, it is characterized in that, possess communication pattern and measurement pattern, carry out signal of communication transmission and reception in a communication mode, realize communication function; Carry out measuring-signal transmission, channel output signal collection and analysis in measurement mode, realize PLC channel measurement function, comprising:
Communication digital modulation module, in a communication mode, follows the communication protocol that plc communication network adopts, carries out digital modulation to communication data, produces communication digital signal and exports transmission front-end module to;
Measure digital signal generation module, in measurement mode, produce and measure digital signal and export transmission front-end module to;
Send front-end module, in a communication mode, the communication digital signal that received communication digital modulation module exports, carries out digital-to-analogue conversion, filtering and amplification process to communication digital signal, produces the signal of communication of simulation and export channel to; In measurement mode, receive the measurement digital signal measured digital signal generation module and export, digital-to-analogue conversion, filtering, amplification process are carried out to measurement digital signal, produces the measuring-signal of simulation and export channel to;
Receiving front-end module, channel output signal is amplified, filtering, analog-to-digital conversion process, obtain receiving digital signals, and receiving digital signals is transferred to communication digital demodulation blocks, measure digital signal processing module;
Communication digital demodulation blocks, in a communication mode, follows the communication protocol that plc communication network adopts, and carries out digital demodulation to the receiving digital signals that receiving front-end module exports, and recovers communication data;
Measure digital signal processing module, in measurement mode, the receiving digital signals that receiving front-end module exports is analyzed, obtains channel measurement, and channel measurement is sent to human-computer interaction module;
Human-computer interaction module, comprise control inerface and display interface, control inerface receive that operating personnel provide for arranging plc communication device mode of operation and arranging the configuration information of each module of plc communication device and be sent to control module, display interface display channel measurement and/or the operating state of plc communication device;
Control module, the configuration information that the configuration information exported according to human-computer interaction module and/or upper layer software (applications) provide, arranges mode of operation and each module of configuration plc communication device of plc communication device.
2. a kind of plc communication device possessing measurement pattern as claimed in claim 1, is characterized in that, also comprise memory module, for storing the digital signal of each module of plc communication device and/or controling parameters and/or configuration information and/or channel measurement.
3. a kind of plc communication device possessing measurement pattern as claimed in claim 2, it is characterized in that, also comprise data interface module, external computer is connected to plc communication device by data interface module, thus plc communication device can be accessed, realize with plc communication device mutual.
4. a kind of plc communication device possessing measurement pattern as claimed in claim 3, it is characterized in that, in measurement mode, external computer obtains the state information and/or measurement digital signal of measuring digital signal generation module by data interface module, analyze and show it.
5. a kind of plc communication device possessing measurement pattern as claimed in claim 3, is characterized in that, in measurement mode, external computer obtains by data interface module the receiving digital signals that receiving front-end module exports, and analyzes and show it.
6. a kind of plc communication device possessing measurement pattern as claimed in claim 3, it is characterized in that, in measurement mode, external computer obtains the channel measurement measured digital signal processing module and provide by data interface module, and further optimization process is carried out to channel measurement, thus obtain channel measurement more accurately.
7. as claim 5 or a kind of plc communication device possessing measurement pattern according to claim 6, it is characterized in that, in measurement mode, external computer to channel measurement carry out flexible, various, show targetedly, thus provide more powerful, friendly expansion display interface.
8. a kind of plc communication device possessing measurement pattern as claimed in claim 3, it is characterized in that, external computer is provided for the configuration information arranging plc communication device mode of operation and arrange each module of plc communication device to control module by data interface module, thus provide more powerful, friendly expansion control inerface.
9. a kind of plc communication device possessing measurement pattern as claimed in claim 3, it is characterized in that, external computer by the parameter/data for sending measuring-signal, collection/analysis channel output signal, display measurement result in data interface module deletion, rewriting or additional memory module, thus improves the flexibility of configuration.
10. a kind of plc communication device possessing measurement pattern as claimed in claim 3, it is characterized in that, external computer can directly produce measurement digital signal, and the memory module of plc communication device is write by data interface module, in measurement mode, measure digital signal generation module and can read measurement digital signal from memory module, and export measurement digital signal to transmission front-end module, improve the flexibility that measuring-signal produces.
11. a kind of plc communication devices possessing measurement pattern as claimed in claim 3, is characterized in that, memory module stores the log information of plc communication device in running; External computer can read the storage content of memory module by data interface module, then analyze targetedly, process.
12. a kind of plc communication devices possessing measurement pattern as claimed in claim 1, it is characterized in that, measure the part software/hardware unit of digital signal generation module multiplexed communications digital modulation module, measure the part software/hardware unit of digital signal processing module multiplexed communications digital demodulation blocks, thus reduce the cost caused because of additional measurement modes.
13. 1 kinds of channel measuring methods, the plc communication device possessing measurement pattern as described in claim 1 ~ 12 any one at channel input and channel output configuration, is characterized in that, comprise the following steps:
(1), channel input plc communication device is set is in measurement pattern, make channel input plc communication device send measuring-signal, in order to encourage channel;
(2), channel output plc communication device is set is in measurement pattern, make channel output plc communication device gather channel output signal, obtain receiving digital signals;
(3), channel output plc communication device and/or the external computer that is connected with channel output plc communication device analyze receiving digital signals, obtains channel measurement;
(4), the display interface of channel output plc communication device and/or the external Computer display channel measurement that is connected with channel output plc communication device,
In above-mentioned steps, being parameter matching between each plc communication device, if use external computer, is parameter matching between so each plc communication device and corresponding external computer thereof.
14. a kind of channel measuring methods as claimed in claim 13, is characterized in that, also comprise step (5): channel output plc communication device and/or the external Computer Storage channel measurement be connected with channel output plc communication device.
15. 1 kinds of channel measuring methods, at the plc communication device that possess measurement pattern of channel output configuration as described in claim 1 ~ 12 any one, is characterized in that, comprise the following steps:
(1), arrange channel output plc communication device and be in measurement pattern, make the plc communication device of channel output gather channel output signal, obtain receiving digital signals, wherein channel output signal comprises interference signal and/or noise signal;
(2), channel output plc communication device and/or the external computer that is connected with channel output plc communication device analyze receiving digital signals, obtains the interference signal of channel and/or the measurement result of noise signal;
(3), the display interface of channel output plc communication device and/or this channel measurement of external Computer display of being connected with channel output plc communication device,
In above-mentioned steps, if use the external computer be connected with channel output plc communication device to be connected, so its corresponding external computer of channel output plc communication device is parameter matching.
16. a kind of channel measuring methods as claimed in claim 15, is characterized in that, also comprise step (4): channel output plc communication device and/or the external Computer Storage channel measurement be connected with channel output plc communication device.
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