CN102025398B - Wired carrier communication method and device - Google Patents
Wired carrier communication method and device Download PDFInfo
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Abstract
The invention discloses a wired carrier communication method and a wired carrier communication device. A dual-mode communication method of spread-spectrum modulation technology and narrow-band modulation technology is utilized to improve the reliability and environmental adaptation of wired channel transmission and improve the critical physical layer communication capacity which limits the large-scale promotion and application of carrier communication currently. The wired carrier communication method comprises the following steps of: modulating a baseband signal by adopting a dual-mode modulation mode of spread-spectrum modulation and narrow-band modulation to obtain modulated signals of two modes; sending the modulated signals of the two modes; receiving the modulated signals of the two modes; and demodulating the modulated signals of the two modes by adopting the dual-mode modulation mode of spread-spectrum modulation and narrow-band modulation.
Description
Technical field
The present invention relates to cable communicating technology field, particularly relate to a kind of wired carrier-current communication method and apparatus.
Background technology
Current communication mode has radio communication and wire communication, and wherein power line communication (PLC) is a kind of cable communicating technology that utilizes the power line resource of electric power system to carry out information transmission.Because it uses carrier modulation technology, therefore also referred to as power line carrier communication.It has wide coverage, always online, do not need the advantages such as other subordinate line, thereby power line communication has obtained comparatively widely application in Modern Family's intellectuality, broadband access, long-distance meter-reading system.
But power line channel is a kind of special channel, the laying of itself is for electric energy transmitting, and not transmits data, so its transmission characteristic is often difficult to meet the requirement of data communication.For example, power line channel has the basic characteristics such as high decay, strong noise, high distortion, time variation, and these factors have all caused tremendous influence to communication.Therefore, power line carrier communication from the beginning inevitable requirement adopts comparatively complicated modulation demodulation system, to overcome above-mentioned adverse effect.
The modulation technique such as spread spectrum, multi-transceiver technology has all solved the inadequate natural endowment of power line channel for communicating by letter from some aspect, but due to complexity and the diversity of power line channel, these technology all more or less have certain limitation.
As multi-transceiver technology, its main target is to improve the availability of frequency spectrum, promoting transmission rate.Application based on current power line carrier communication mainly concentrates on automatic data logging and automation field, and topmost target remains provides reliable sane low speed transmissions performance, and therefore, in actual conditions, spread spectrum uses wider.
Spread spectrum is the most frequently used modulation technique in power line carrier communication field, and it can be being submerged in signal extraction in noise out by spreading gain, and therefore spread spectrum communication generally has high sensitivity, can effectively resist the height decay of power line channel.Specifically, please refer to Shannon (C.E.Shannon) channel capacity theorem:
C-channel capacity (representing by the rate of information throughput);
W-signal bandwidth
S-signal power
N-noise power
Shannon formula shows: when signal transmission rate C mono-timing, signal bandwidth W and signal to noise ratio S/N can exchange, and can reduce the requirement to signal to noise ratio by increasing signal bandwidth.Spread spectrum communication is exactly to increase signal bandwidth to exchange the benefit in signal to noise ratio for, Here it is basis that spread spectrum can improve sensitivity and anti-fading ability.And along with the increase of bandwidth, noise in band and various interference have also increased, especially at the noisy like this channel circumstance of power line channel, because the electrical appliance on circuit is varied, the interference of release and noise are also different, except the background noise of extensive existence, also has various burst noises and impulsive noise, its frequency range has even covered whole communications band, and its frequency spectrum of this noise like and white noise are absolutely different, cannot obtain enough spreading gains by spread spectrum completely.In addition, power line channel be also one nonlinear, the communication channel of non-stationary, along with the increase of signal bandwidth, the situation of its distorted signals becomes more serious, and spread-spectrum signal is also poor to the resistance of this class distorted signals.Therefore, in a lot of situations, use the carrier communication of spread spectrum not obtain its spreading gain completely, sensibility in practice will be well below theoretical sensitivity.Simple spread spectrum cannot solve the reliable communication problem of power line channel.
In addition, power line carrier communication product is still limited by physical layer communication ability at present, a lot of systems all need a large amount of adjustment and installations that manually carry out at the scene, a kind of product or scheme are used good in certain pilot, but change an environment and cannot receive same effect, a kind of product is being installed initial stage operational excellence, but after operation a period of time, the case of hydraulic performance decline is too numerous to enumerate, these situations are mainly the communication plan underactions due to bottom, the reasons such as system redundancy is inadequate, and robustness is poor cause.This present situation causes a large amount of manpower and materials of later stage needs to carry out system maintenance, has increased complexity and the cost of power line carrier application, has restricted the large-scale promotion application of power line carrier communication.
Summary of the invention
The object of the present invention is to provide a kind of wired carrier-current communication method and apparatus, to solve the integrity problem of the wire message way such as power line channel, and improve the crucial physical layer communication ability that restricts at present carrier communication large-scale promotion application.
For solving above technical problem, the invention provides a kind of wired carrier-current communication method, it comprises: adopt the double mode modulation mode of band spectrum modulation and narrowband modulation to modulate baseband signal, obtain the modulated signal of two kinds of patterns; Send the modulated signal of described two kinds of patterns; Receive the modulated signal of described two kinds of patterns; Adopt the double mode modulation mode of band spectrum modulation and narrowband modulation to carry out demodulation to the modulated signal of described two kinds of patterns.
Further, the process of the modulated signal of two kinds of patterns of described transmission comprises: on two passages, send the modulated signal of described two kinds of patterns respectively simultaneously.
Further, the process of the modulated signal of two kinds of patterns of described transmission comprises: on same passage, timesharing sends the modulated signal of described two kinds of patterns.
Further, the process of described transmission modulated signal comprises: auxiliary targeting signal is set before the modulated signal obtaining in band spectrum modulation; Send the modulated signal that is provided with auxiliary targeting signal with spread spectrum mode; Send with narrow band mode the modulated signal that narrowband modulation was obtained.
Further, the process of described reception modulated signal comprises: receive with spread spectrum mode; Detect and whether receive auxiliary targeting signal; In the time receiving auxiliary targeting signal, after the first default time slot, receiving mode is converted to narrow band mode; After the second default time slot, receiving mode is converted to spread spectrum mode.
Further, the process of described transmission modulated signal comprises: auxiliary targeting signal is set before the modulated signal obtaining in narrowband modulation; Send the modulated signal that is provided with auxiliary targeting signal with narrow band mode; Send with spread spectrum mode the modulated signal that band spectrum modulation was obtained.
Further, the process of described reception modulated signal comprises: receive with narrow band mode; Detect and whether receive auxiliary targeting signal; In the time receiving auxiliary targeting signal, after the 3rd default time slot, receiving mode is converted to spread spectrum mode; After the 4th default time slot, receiving mode is converted to narrow band mode.
Further, the process of described transmission modulated signal comprises: the modulated signal that alternately repeatedly sends band spectrum modulation and narrowband modulation and obtained with spread spectrum mode and narrow band mode.
Further, the process of described reception modulated signal comprises: in the first Preset Time and the second Preset Time, alternately receive modulated signal with spread spectrum mode and narrow band mode respectively.
The present invention also provides a kind of wired carrier-current communication device, comprise: carrier module control logic unit, band spectrum modulation module, narrowband modulation module, spread spectrum demodulation module, narrowband demodulation module, transtation mission circuit and receiving circuit, and: described band spectrum modulation module and narrowband modulation module are connected between described carrier module control logic unit and transtation mission circuit side by side, so that baseband signal is carried out respectively to band spectrum modulation and narrowband modulation; The modulated signal that the modulated signal that described transtation mission circuit timesharing transmission band spectrum modulation obtains and narrowband modulation obtain; Described receiving circuit is in order to receive signal, and its signal receiving comprises spread-spectrum signal and narrow band signal; Described spread spectrum demodulation module and narrowband demodulation module are connected between described receiving circuit and carrier module control logic unit side by side, carry out respectively spread spectrum demodulation and narrowband demodulation with the spread-spectrum signal to received and narrow band signal.
Further, described transtation mission circuit comprises: auxiliary targeting signal arranges module, before the modulated signal that band spectrum modulation or narrowband modulation obtain, auxiliary targeting signal is set.
Further, described receiving circuit comprises: detection module, and whether received spread-spectrum signal or narrow band signal front end are equipped with an auxiliary targeting signal; Handover module, is connected in described detection module, in the time described auxiliary targeting signal being detected, realizes the switching between spread spectrum demodulation module and narrowband demodulation module.
Further, described receiving circuit comprises: automatic switching module, respectively with the first Preset Time and the second Preset Time, alternately switches spread spectrum demodulation module and narrowband demodulation module.
The present invention separately provides a kind of wired carrier-current communication device, comprising: carrier module control logic unit; Spread spectrum transtation mission circuit and arrowband transtation mission circuit; Band spectrum modulation module, is connected between described carrier module control logic unit and spread spectrum transtation mission circuit; Narrowband modulation module, is connected between described carrier module control logic unit and arrowband transtation mission circuit; Spread spectrum receiving circuit and narrow-band reception circuit; Spread spectrum demodulation module, is connected between described spread spectrum receiving circuit and carrier module control logic unit; Narrowband demodulation module, is connected between described narrow-band reception circuit and carrier module control logic unit.
Wired carrier-current communication method and apparatus provided by the present invention, for the feature of low frequency power line carrier communication and the feature of power line channel, from solving the existing problem of spread spectrum of current main flow, the dual mode communication method that spread spectrum adds narrowband modulation technology has been proposed, to strengthen reliability and the environmental suitability of wire message way transmission, improve the crucial physical layer communication ability of the large-scale promotion application of restriction carrier communication at present.
Brief description of the drawings
The schematic flow sheet of the wired carrier-current communication method that Fig. 1 provides for one embodiment of the invention;
Fig. 2 and Fig. 3 are respectively two kinds of implementation schematic diagrames that the modulated signal of two kinds of patterns is transmitted in passage;
Fig. 4 and Fig. 5 are respectively leading auxiliary pattern synchronization method and the schematic diagram without leading auxiliary pattern blind synchronization method;
The structure calcspar of the wired carrier-current communication device that Fig. 6 provides for the embodiment of the present invention one;
The structure calcspar of the wired carrier-current communication device that Fig. 7 provides for the embodiment of the present invention two;
Fig. 8 and Fig. 9 are respectively the schematic diagram of two kinds of power line noises.
Embodiment
For above-mentioned feature and advantage of the present invention can be become apparent, exemplary embodiment cited below particularly, and coordinate accompanying drawing, be described in detail below.
From the description of background technology, can know, spread-spectrum modulation technique has high sensitivity, can effectively resist the height decay of power line channel, but spread-spectrum signal is poor to the resistance of distorted signals, all kinds of bursty interference and impulse disturbances etc. are also resisted poor, and these interference are interference sources comparatively general on power line channel.For this reason, inventor is applied to narrowband modulation technology in power line communication, and said narrowband modulation technology refers to the various analog or digital modulation techniques of bandwidth far below carrier frequency here, as the modulating FM of simulation and digital ASK, PSK, FSK etc.After research, find, although narrowband modulation technology aspect antagonism random noise not as spread-spectrum modulation technique, because its bandwidth is narrower, in band, disturb lessly, and be easy to avoid that some single-tones disturb and arrowband interference; And adopting after suitable modulation system (as PSK and FSK), the ability of its antagonism phase distortion also greatly strengthens.For this reason, the present invention proposes the wire radio dual mode communication technology that spread-spectrum modulation technique adds narrowband modulation technology.Specifically describe as follows:
Please refer to Fig. 1, the schematic flow sheet of its wired carrier-current communication method providing for one embodiment of the invention, as shown in the figure, the method comprises the steps:
S1: adopt the double mode modulation mode of band spectrum modulation and narrowband modulation to modulate baseband signal, obtain the modulated signal of two kinds of patterns;
S2: the modulated signal that sends described two kinds of patterns;
S3: the modulated signal that receives described two kinds of patterns;
S4: adopt the double mode modulation mode of band spectrum modulation and narrowband modulation to carry out demodulation to the modulated signal of described two kinds of patterns.
Visible, above wired carrier-current communication method is got up spread-spectrum modulation technique and narrowband modulation Technology Integration, form a kind of carrier wave dual mode communication pattern, this is a kind of pattern redundant technique, the object that it adopts diverse ways to transmit identical data to reach reliable communication, has strengthened adaptability and the robustness of power line carrier transmission under various varying environments.There is following advantage: on the one hand, obtain good anti-decay property by band spectrum modulation, make sensitivity have guarantee, on the other hand, obtain good anti-interference and anti-distortion performance by arrowband, environmental suitability is greatly improved.
Describe the implementation method of step S2 (sending the modulated signal of two kinds of patterns) below in detail.Please refer to Fig. 2 and Fig. 3, it has provided respectively two kinds of basic implementations.First kind of way: as shown in Figure 2, on two passages, send the modulated signal of two kinds of patterns respectively, general two passages are tuned in different carrier frequencies to avoid the mutual interference of two kinds of mode signal phases simultaneously.The advantage of this mode is that efficiency is high, same segment information if once transmission, cost is that sending and receiving end modulator-demodulator expense is larger, need to do two independently passage with the modulating data of two kinds of forms of while modulation and demodulation.The second way: as shown in Figure 3, on same passage, timesharing sends the modulated signal of described two kinds of patterns, now two passages may be tuned in same carrier frequency because two kinds of patterns separate in time.This mode only requires a transmission channel, and two kinds of modulation formats successively carry out modulation and demodulation, and a lot of hardware resources can be multiplexing in passage, and expense is less, and cost is the same segment information of time tranfer that needs twice.Therefore, those skilled in the art can consider hardware spending and efficiency of transmission requires to select concrete bimodulus implementation method.
In addition, selecting the second way, i.e., when mode that same passage timesharing sends, transmitting terminal alternately sends the modulated signal that spread spectrum and narrowband modulation obtain, and receiving terminal needs the synchronous pattern handover operation of following the tracks of transmitting terminal, otherwise can cause mode mismatch.For this reason, the invention provides two kinds of methods and realize the synchronous of double mode switching.Wherein a kind of is to use leading auxiliary pattern synchronization method; Another kind is without leading auxiliary pattern blind synchronization method.The former uses pilot tone or other synchronization preamble, receiving terminal present mode detect leading after, by time slot, receive path is switched to next pattern; The advantage of this method is that efficiency is high, only needs every kind of mode transfer once to realize double mode effect, and shortcoming is the reliability that pattern synchronization depends on detection of preamble, once leading disturbed, be easy to cause the inefficacy of dual mode capability.Another method is blind synchronous without leading auxiliary mode, relies on time redundancy to carry out the coupling completely of implementation pattern.
First, specifically describe the specific implementation of leading auxiliary pattern synchronization method: auxiliary targeting signal is set before the modulated signal that transmitting terminal obtains in band spectrum modulation; Then send with spread spectrum (DS) pattern the modulated signal that is provided with auxiliary targeting signal; Send with arrowband (NB) pattern the modulated signal that narrowband modulation was obtained again.Corresponding to this, first receiving terminal receives with spread spectrum (DS) pattern; And detect whether receive auxiliary targeting signal; In the time receiving auxiliary targeting signal, after the first default time slot, receiving mode is converted to narrow band mode; After the second default time slot, receiving mode is converted to spread spectrum mode.Wherein the first default time slot and second preset time slot respectively according to two kinds of pattern modulated signals the transmission time in passage set.
Detect that (Package Detect, PD) is leading describes above implementation in detail as auxiliary targeting signal as example below taking grouping.Please refer to Fig. 4, it has provided the schematic diagram of leading auxiliary pattern synchronization method.As shown in the figure, in the present embodiment, used grouping to detect the auxiliary targeting signal of (Package Detect, PD) leading conduct, the every frame data of transmitting terminal with each of spread spectrum (DS) pattern and arrowband (NB) pattern once.Divide PD to detect successfully and detect unsuccessfully two kinds of situations with PD.The former receiving terminal, detecting that after the T1 time, receive path being switched to NB pattern after PD receives, returns to DS pattern receive path again and receives after the T2 time, completes and once receives flow process.The latter's receiving terminal does not detect PD, rests on all the time DS receiving mode, fails to reach the effect of double mode reception.
Above embodiment is arranged at auxiliary targeting signal before the modulated signal of band spectrum modulation, and the present invention, not as limit, also can be arranged at auxiliary targeting signal before the modulated signal of narrowband modulation.Specific implementation is as follows:
Auxiliary targeting signal is set before the modulated signal that transmitting terminal obtains in narrowband modulation; Then send with arrowband (NB) pattern the modulated signal that is provided with auxiliary targeting signal; Send with spread spectrum (DS) pattern the modulated signal that band spectrum modulation was obtained again.First receiving terminal receives with arrowband (NB) pattern; And detect whether receive auxiliary targeting signal; In the time receiving auxiliary targeting signal, after the 3rd default time slot, receiving mode is converted to spread spectrum (DS) pattern; After the 4th default time slot, receiving mode is converted to arrowband (NB) pattern.Equally, the 3rd default time slot and the 4th preset time slot respectively according to two kinds of pattern modulated signals the transmission time in passage set.And in the time auxiliary targeting signal not detected, receiving terminal rests on NB receiving mode all the time, fails to reach the effect of double mode reception.
In addition, in the time that above receiving terminal fails to reach the effect of double mode reception, can abandon present frame, make transmitting terminal retransmit.In addition, for auxiliary leading detection mode, can be frequency detecting and correlation detection, corresponding transmitting terminal can be using the sinusoidal signal of a fixed frequency as auxiliary targeting signal, also can be using the data of fixing as auxiliary targeting signal, the present invention is not as limit.
Secondly, specifically describe the specific implementation without leading auxiliary pattern blind synchronization method: the modulated signal that transmitting terminal alternately repeatedly sends band spectrum modulation and narrowband modulation and obtained with spread spectrum (DS) pattern and arrowband (NB) pattern.Receiving terminal in the first Preset Time and the second Preset Time, alternately receives modulated signal with spread spectrum mode and narrow band mode respectively.
Specifically, please refer to Fig. 5, it has provided the schematic diagram without leading auxiliary pattern blind synchronization method.As shown in the figure, the every frame data of transmitting terminal alternately send with DS pattern NB pattern, and receiving terminal is independent carries out DS and the switching of NB receiving mode according to Ta and Tb interval, switches without synchronizeing with sending mode.Conventionally, the transmission times of every frame data is not less than 6 times, to ensure that DS pattern and NB pattern all have at least one times the chance of mating completely with transmitting terminal, thereby has realized the effect of dual mode transmission.
Relatively above two kinds of methods, leading auxiliary pattern synchronization method efficiency is higher, but depends on the detection of auxiliary targeting signal; And relatively low without the efficiency of leading auxiliary pattern blind synchronization method, but do not rely on the detection of assisting targeting signal.Those skilled in the art can select as required.
Please refer to following two embodiment below, its two kinds of implementations that are the wired carrier-current communication device that provides corresponding to above method.
Embodiment mono-:
Please refer to Fig. 6, the structure calcspar of its wired carrier-current communication device providing for the embodiment of the present invention one.As shown in the figure, this wired carrier-current communication device comprises: carrier module control logic unit 10, band spectrum modulation module 22, narrowband modulation module 24, spread spectrum demodulation module 32, narrowband demodulation module 34, transtation mission circuit 40 and receiving circuit 50.Wherein, carrier module control logic unit 10 is connected with a control interface; Band spectrum modulation module 22 and narrowband modulation module 24 are connected between carrier module control logic unit 10 and transtation mission circuit 40 side by side, so that baseband signal is carried out respectively to band spectrum modulation and narrowband modulation; The modulated signal that the modulated signal that transtation mission circuit 40 timesharing transmission band spectrum modulation obtain and narrowband modulation obtain; Receiving circuit 50 is in order to receive signal, and its signal receiving comprises spread-spectrum signal and narrow band signal; Spread spectrum demodulation module 32 and narrowband demodulation module 34 are connected between receiving circuit 50 and carrier module control logic unit 10 side by side, carry out respectively spread spectrum demodulation and narrowband demodulation with the spread-spectrum signal to received and narrow band signal.
Conventionally, transtation mission circuit 40 is interior can be arranged an auxiliary targeting signal module is set, and before the modulated signal that band spectrum modulation or narrowband modulation obtain, auxiliary targeting signal is set.Receiving circuit 50 is interior can arrange detection module and handover module, and wherein detection module detects received spread-spectrum signal or narrow band signal front end and whether is equipped with an auxiliary targeting signal; Handover module is connected in detection module, in the time described auxiliary targeting signal being detected, realizes the switching between spread spectrum demodulation module 32 and narrowband demodulation module 34.In addition, an automatic switching module can be set in receiving circuit, replace detection module and handover module above, respectively with the first Preset Time and the second Preset Time, alternately switch spread spectrum demodulation module 32 and narrowband demodulation module 34.
Above band spectrum modulation module 22 can select direct sequence spread spectrum to modulate to realize, and narrowband modulation module 24 can select FM, ASK, FSK and PSK to realize, and preferably, selects the modulation systems such as BFSK, BPSK, QPSK.
Visible, the wire communication carrier equipment in the present embodiment is corresponding to the second way shown in Fig. 3, and, on same passage, timesharing sends the modulated signal of two kinds of patterns.Its two kinds modulation, demodulation module are multiplexing most of hardware circuit, comprises transmission circuit and analog front circuit etc., and like this, two kinds of modulation systems can only be selected in timesharing, and this design is the result that considers application demand and realize the many factors such as cost.
Embodiment bis-:
It is different from embodiment mono-, has adopted the first kind of way shown in Fig. 2, respectively on two passages, sends the modulated signal of two kinds of patterns simultaneously.So, its two kinds of modulation and demodulation modules need hardware circuit separately to build two independently passages.
Specifically please refer to Fig. 7, the structure calcspar of its wired carrier-current communication device providing for the embodiment of the present invention two.As shown in the figure, this wired carrier-current communication device comprises carrier module control logic unit 100, band spectrum modulation module 220 and narrowband modulation module 240, spread spectrum demodulation module 320 and narrowband demodulation module 340, spread spectrum transtation mission circuit 420 and arrowband transtation mission circuit 440, spread spectrum receiving circuit 520 and narrow-band reception circuit 540.Wherein, band spectrum modulation module 220 is connected between carrier module control logic unit 100 and spread spectrum transtation mission circuit 420; Narrowband modulation module 240 is connected between carrier module control logic unit 100 and arrowband transtation mission circuit 440; Spread spectrum demodulation module 320 is connected between spread spectrum receiving circuit 520 and carrier module control logic unit 100; Narrowband demodulation module 340 is connected between narrow-band reception circuit 540 and carrier module control logic unit 100.
As can be seen from the figure, in embodiment bis-, need to build respectively hardware circuit for band spectrum modulation and two kinds of modulation systems of narrowband modulation, to set up two independently passages, carry out communication, it is higher with respect to embodiment mono-efficiency, and same segment information is as long as once transmit, but its hardware spending is relatively large.Those skilled in the art can consider hardware spending and efficiency of transmission requires to select concrete make.
Please refer to Fig. 8 and Fig. 9 below, it has provided the spectrogram of two kinds of power line noises, and the feature of the first is that noise level is higher, but comparatively steady, its approximate random noise characteristic in a wider bandwidth.The feature of the second is that noise level is lower, but harmonic wave and arrowband disturb compared with horn of plenty.In above-mentioned two kinds of environment, test spread spectrum respectively, narrowband modulation technology and carrier wave bimodulus technology provided by the present invention, the pseudo-random data frame of 1000 30 bytes is transmitted respectively in experiment, and statistics receives frame error rate (PER), wherein:
Environment 1: spread spectrum PER～2.9%, arrowband PER～16.7%, bimodulus PER～0.3%
Environment 2: spread spectrum PER～23.3%, arrowband PER～3.2%, bimodulus PER～0.4%
Test shows, although channel circumstance is widely different, carrier wave bimodulus test result is comparatively approaching, and environment consistency is better, and performance all more simple a kind of modulation technique improve a lot, transmission reliability and environmental suitability have had large increase.Test again in addition multiple power line environment, all obtained similar result.Therefore above method is also applicable to the communication system of other low-frequency range (9KHz～500KHz) or high band (more than 500KHz) wire radio channel, comprises twisted-pair feeder channel, coaxial cable channel, and other various wire message way.
These are only that for example, not in order to limit the present invention, the scope that protection scope of the present invention should be contained with claims is as the criterion.
Claims (12)
1. a wired carrier-current communication method, is characterized in that, comprising:
Adopt the double mode modulation mode of band spectrum modulation and narrowband modulation to modulate baseband signal, obtain the modulated signal of two kinds of patterns, described baseband signal is same application data;
On the passage of two different frequencies, send respectively simultaneously or on same passage timesharing send the modulated signal of described two kinds of patterns;
Receive the modulated signal of described two kinds of patterns;
Adopt the double mode rectification mode of spread spectrum demodulation and narrowband demodulation to carry out demodulation to the modulated signal of described two kinds of patterns.
2. wired carrier-current communication method according to claim 1, is characterized in that, the process of described transmission modulated signal comprises:
Auxiliary targeting signal is set before the modulated signal obtaining in band spectrum modulation;
Send the modulated signal that is provided with auxiliary targeting signal with spread spectrum mode;
Send with narrow band mode the modulated signal that narrowband modulation was obtained.
3. wired carrier-current communication method according to claim 2, is characterized in that, the process of described reception modulated signal comprises:
Receive with spread spectrum mode;
Detect and whether receive auxiliary targeting signal;
In the time receiving auxiliary targeting signal, after the first default time slot, receiving mode is converted to narrow band mode;
In the time receiving auxiliary targeting signal, after the second default time slot, receiving mode is converted to spread spectrum mode.
4. wired carrier-current communication method according to claim 1, is characterized in that, the process of described transmission modulated signal comprises:
Auxiliary targeting signal is set before the modulated signal obtaining in narrowband modulation;
Send the modulated signal that is provided with auxiliary targeting signal with narrow band mode;
Send with spread spectrum mode the modulated signal that band spectrum modulation was obtained.
5. wired carrier-current communication method according to claim 4, is characterized in that, the process of described reception modulated signal comprises:
Receive with narrow band mode;
Detect and whether receive auxiliary targeting signal;
In the time receiving auxiliary targeting signal, after the 3rd default time slot, receiving mode is converted to spread spectrum mode;
In the time receiving auxiliary targeting signal, after the 4th default time slot, receiving mode is converted to narrow band mode.
6. wired carrier-current communication method according to claim 1, is characterized in that, the process of described transmission modulated signal comprises:
The modulated signal that alternately repeatedly sends band spectrum modulation and narrowband modulation and obtained with spread spectrum mode and narrow band mode.
7. wired carrier-current communication method according to claim 6, is characterized in that, the process of described reception modulated signal comprises:
In the first Preset Time and the second Preset Time, alternately receive modulated signal with spread spectrum mode and narrow band mode respectively.
8. a wired carrier-current communication device, is characterized in that, comprising: carrier module control logic unit, band spectrum modulation module, narrowband modulation module, spread spectrum demodulation module, narrowband demodulation module, transtation mission circuit and receiving circuit, and:
Described carrier module control logic unit is in order in transmission path, the sequential of timesharing process of transmitting is controlled, and in receiving path, the sequential of timesharing receiving course controlled;
Described band spectrum modulation module and narrowband modulation module are connected between described carrier module control logic unit and transtation mission circuit side by side, so that baseband signal is carried out respectively to band spectrum modulation and narrowband modulation;
The modulated signal that the modulated signal that described transtation mission circuit timesharing transmission band spectrum modulation obtains and narrowband modulation obtain;
Described receiving circuit is in order to receive signal, and its signal receiving comprises spread-spectrum signal and narrow band signal;
Described spread spectrum demodulation module and narrowband demodulation module are connected between described receiving circuit and carrier module control logic unit side by side, carry out respectively spread spectrum demodulation and narrowband demodulation with the spread-spectrum signal to received and narrow band signal.
9. wired carrier-current communication device according to claim 8, is characterized in that, described transtation mission circuit comprises:
Auxiliary targeting signal arranges module, before the modulated signal that band spectrum modulation or narrowband modulation obtain, auxiliary targeting signal is set.
10. wired carrier-current communication device according to claim 8, is characterized in that, described receiving circuit comprises:
Detection module, whether received spread-spectrum signal or narrow band signal front end are equipped with an auxiliary targeting signal;
Handover module, is connected in described detection module, in the time described auxiliary targeting signal being detected, realizes the switching between spread spectrum demodulation module and narrowband demodulation module.
11. wired carrier-current communication devices according to claim 8, is characterized in that, described receiving circuit comprises:
Automatic switching module, respectively with the first Preset Time and the second Preset Time, alternately switches spread spectrum demodulation module and narrowband demodulation module.
12. 1 kinds of wired carrier-current communication devices, is characterized in that, comprising:
Carrier module control logic unit in order in transmission path, the sequential of while process of transmitting is controlled, and is controlled the sequential of while receiving course in receiving path;
Spread spectrum transtation mission circuit and arrowband transtation mission circuit;
Band spectrum modulation module, is connected between described carrier module control logic unit and spread spectrum transtation mission circuit;
Narrowband modulation module, is connected between described carrier module control logic unit and arrowband transtation mission circuit;
Spread spectrum receiving circuit and narrow-band reception circuit;
Spread spectrum demodulation module, is connected between described spread spectrum receiving circuit and carrier module control logic unit;
Narrowband demodulation module, is connected between described narrow-band reception circuit and carrier module control logic unit.
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| CN103166675B (en) * | 2013-03-03 | 2016-02-17 | 北京福星晓程电子科技股份有限公司 | Power line signal based on spread spectrum detects and acquisition methods and system |
| CN103795441B (en) * | 2013-12-12 | 2016-02-03 | 青岛东软载波科技股份有限公司 | A kind of low-voltage power line carrier communication circuit based on BFSK, BPSK, DBPSK mode modulation |
| CN105225455B (en) * | 2015-10-20 | 2019-04-19 | 中北大学 | A kind of turntable wireless proximity telemetry system |
| CN107947829B (en) * | 2017-12-27 | 2023-07-25 | 上海道生物联技术有限公司 | Time division duplex communication system and method combining spread spectrum and narrowband MIMO |
| CN109274400A (en) * | 2018-10-25 | 2019-01-25 | 东莞市慧眼数字技术有限公司 | The information transferring method and system of conveying length in a kind of raising cable |
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| JP2001292077A (en) * | 2000-04-04 | 2001-10-19 | Osaki Electric Co Ltd | Communication method using channel occupy signal |
| EP1432099A2 (en) * | 2002-12-19 | 2004-06-23 | Panasonic Communications Co., Ltd. | Control apparatus and control method for managing communications between multiple electrical appliances through a household power line network |
| CN2657294Y (en) * | 2003-07-24 | 2004-11-17 | 宝山钢铁股份有限公司 | Digital voice electric power-line carrier communication device |
| CN101107788A (en) * | 2005-10-12 | 2008-01-16 | 松下电器产业株式会社 | Method and apparatus for power line communication |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001292077A (en) * | 2000-04-04 | 2001-10-19 | Osaki Electric Co Ltd | Communication method using channel occupy signal |
| EP1432099A2 (en) * | 2002-12-19 | 2004-06-23 | Panasonic Communications Co., Ltd. | Control apparatus and control method for managing communications between multiple electrical appliances through a household power line network |
| CN2657294Y (en) * | 2003-07-24 | 2004-11-17 | 宝山钢铁股份有限公司 | Digital voice electric power-line carrier communication device |
| CN101107788A (en) * | 2005-10-12 | 2008-01-16 | 松下电器产业株式会社 | Method and apparatus for power line communication |
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