CN100521568C - Low-voltage power line data communication system and method - Google Patents
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Abstract
The invention discloses a low voltage power line data communicating system and method, where host station device is coupled with low voltage power line and connected with data network, which acts as a gateway to transmit data between the low voltage power line and the data network, including data transmission of user terminals between power line interface and user data interface. It also uses relays, coupled with the low power line between the host station device and each user terminal to relay data signal transmitted by the host station device, and including a first communication device and a second communication device. It effectively increases system communication distance, thus realizing high speed data information transmission on low voltage power network in the same range of distributing transformer.
Description
Technical field
The present invention relates to a kind of electric line communication system and method that realizes high-speed data communication at low-voltage network.
Background technology
Power line communication technology (Power Line Communication Technology) is called for short PLC, is meant a kind of communication mode that utilizes power line transmission data and voice signal.Power line communication has had the developing history of decades, going up by the lower frequency of electric wave carrier utilization (9-490kHz) to transmit remote action data or speech than low rate at mesohigh power transmission network (more than the 35kV), is one of principal mode of using of power line communication technology.Deep day by day along with domestic town and country power distribution network retrofit work, many manufacturers begin the distribution carrier terminal equipment that development is used for the communication of pressure (10kV) power distribution network, and message transmission rate can reach 1200bps.In low pressure (220V) field, the PLC technology at first is used to load control, remote meter reading and household automation, and its transmission rate is generally 1200bps or lower, is called low speed PLC.The power line communication technology of low-voltage power line transmission rate more than 1Mbps of carrying out both at home and abroad in recent years that utilize is referred to as high speed PLC.
The technological break-through of high speed PLC starts from nineteen ninety-five, and the Norweb communication company of subsidiary of Britain United Power Company and Canadian Nortel (Nortel Networks) company jointly developed DPL (Digital Power Line) technology jointly at that time.1995-1997 two in the period of, Norweb and Nortel company successfully test 20 residents at Manchester, England, comprising voice service.In October, 1997, problems such as having solved power noise is claimed by this two company, obtained the important breakthrough of power line carrier technology, utilize digital power line ZAP newly developed to realize on low-voltage network, carrying out the telecommunication of 1Mbps, thereby the power line that will extend in all direction is converted into information superhighway.On March 25th, 1998, set up the NORMEB of co-partnership company, carry out the marketing of this technology.Hereafter, the research institution of many countries and company have carried out high speed power line Study on Technology and exploitation, and the transmission rate of product also develops into higher rate from 1Mbps.
Along with the develop rapidly of technique of internet, the number of logon is doubled and redoubled.Yet, adopt which kind of communication mode to make user terminal be connected to nearest broadband network connection device, becoming one of difficult point of long-term puzzlement people, also is one of universal bottleneck in internet, is called " last kilometer " problem that broadband network inserts by the insider.Utilization extend in all direction, spread all over town and country, through user 220V low-voltage power line transmitting high speed data the PLC technology with its need not wiring, wide coverage, distinguishing feature easy to connect, thought to provide one of the most competitive technology of " last 300 meters " solution by the insider.Utilize high speed PLC can transmit data, voice, video and electric power simultaneously, might bring the new trend of " four networks one platform ".
45Mpbs high speed power line communication system is the highest PLC system of present transmission rate.But in existing systems, circuit distance is restricted, and the information of data network is coupled to the demand of all users on the low-voltage power spider lines that main website equipment in the power line can not satisfy same low-tension transformer downstream.
Summary of the invention
Therefore, the purpose of this invention is to provide a kind of low-voltage power line data communication system, can satisfy the online high-speed data transmission of Information of low-voltage power in the same distribution transformer scope.Another object of the present invention provides corresponding communication method.
For this reason, the invention provides a kind of low-voltage power line data communication system, comprising: main website equipment, be connected with the low-voltage power line coupling and with data network, between low-voltage power spider lines and data network, transmit data as gateway; The user terminal that comprises power line interface and user data interface is used for transmitting data between power line interface and user data interface; It is characterized in that: this communication system also comprises repeater, repeater is coupled with low-voltage power line between main website equipment and user terminal, be used for the data-signal that relaying main website equipment sends, this repeater comprises first communication equipment of communicating by letter with first frequency range with main website equipment and the second communication equipment of communicating by letter with second frequency range with user terminal.
Wherein, described main website equipment, user terminal, first communication equipment and second communication equipment preferably include OFDM (Orthodoxy Frequency Division Multiplex) modulator-demodulator.Thereby can adopt OFDM to be modulated between described main website equipment, repeater and the user terminal and carry out data communication.
Described main website equipment can comprise network management module, for example uses the equipment in SNMP (simplenetwork management protocol, Simple Network Management Protocol) the management low-voltage power spider lines.
Described repeater can also comprise gateway module, is used to connect other data access service.
The data of transmitting on this low-voltage power line can be any data, comprise voice, video data etc.Correspondingly, the user data interface in the described user terminal can comprise multiple interfaces, such as Ethernet interface, USB interface, telephone line interface or the like.
If a repeater downstream connects a plurality of described user terminals, each user terminal can constitute local area network (LAN) by this repeater.
Described user terminal also comprises various other modules, to realize for example router, VPN (Virtual Private Network, VPN), NAT (Network AddressTranslation, network address translation), functions such as DHCP (DHCP, Dynamic HostConfiguration Protocol) and fire compartment wall.
For achieving the above object, the present invention also provides a kind of method at the enterprising row data communication of low-voltage power line, comprise: main website equipment is provided, is connected, between low-voltage power spider lines and data network, transmit data as gateway with the low-voltage power line coupling and with data network; The user terminal that comprises power line interface and user data interface is provided, is used between power line interface and user data interface, transmitting data; It is characterized in that: also be provided at the repeater that is coupled with low-voltage power line between main website equipment and the user terminal, be used for the data-signal that relaying main website equipment sends, wherein, this repeater is with first frequency range and main website devices communicating, with second frequency range and user terminal communication.
Wherein, the OFDM modulation system is preferably adopted in the transmission of described data.
In a preferred embodiment of the invention, the available system frequency range is made up of a plurality of frequency sub-band, determines according to the condition of respective lines which frequency sub-band described first frequency range, second frequency range and aforementioned local area network (LAN) adopt respectively.
Determining and can carrying out when laying the low-voltage power line data communication system of frequency sub-band perhaps carried out in low-voltage power line data communication system running in real time.
Description of drawings
Below in conjunction with accompanying drawing to a preferred embodiment of the present invention will be described in detail.In the accompanying drawing:
Fig. 1 is the schematic block diagram of the preferred embodiment of low-voltage power line communication system of the present invention;
Fig. 2 is the schematic diagram that the frequency sub-band in the low-voltage power line communication means of the present invention is divided.
Embodiment
As shown in Figure 1, low-voltage power line communication system of the present invention comprises three main parts, promptly main website (HE, Head End), be used for that signal amplifies and the repeater (HG of regeneration, HomeGateway) and user terminal (CPE, Customer Premises Equipment).Wherein information flow is HE-HG, and the communication of HG-CPE or HE-CPE direction is downlink communication; Information flow is HG-HE, and row communication is called in the communication of CPE-HG or CPE-HE direction.
As shown in Figure 1, the position that is used for data message is coupled to the main website equipment of low-voltage power line does not have special requirement, but preferably and MV/LV (Medium Voltage/Low Voltage, middle pressure-low pressure) distribution transformer be installed in the power distribution station of sub-district together.Main website transmits data as a gateway between power line network and data network.The major part of main website is the digital modems of a high speed, and it is injected into low-voltage power line by coupler with signal.Described data network for example is internet (as shown in Figure 1), perhaps Ethernet, ATM (AsynchronousTransmission Mode, asynchronous transfer mode) network etc.Main website is the effector and the manager of PLC network, can realize the resource-sharing between the different user and the setting of QoS of customer by it.In addition, can the embedded with network administration module in the main website, thus can use equipment in the snmp management PLC network.
As an example, the main website device interior can comprise the 45Mbps high speed power line communication digit chip DSS5100 of DS2 company, and contains WAN (Wide Area Network, the wide area network) module of standard.
According to the size of low-voltage power spider lines, can use one or more repeater, to improve the PLC transmission range.According to the present invention, repeater comprises the first communication equipment M1 and second communication equipment M2.The first communication equipment M1 and main website devices communicating, the second logical equipment M2 communicates by letter with subscriber terminal equipment.Repeater of the present invention carries out when realizing these two kinds of communications by frequency partition.That is, first communication equipment uses first frequency range with communicating by letter of main website equipment, and second communication equipment and subscriber terminal equipment adopt second frequency range.In a preferred embodiment of the invention, first frequency range is lower than second frequency range.But,, also can make second frequency range be lower than first frequency range according to the state of circuit.Repeater is used for the signal that relaying main website equipment sends, to solve the problem of fading channel.
The major part of repeater also is the high-speed figure modulator-demodulator, and its position does not have special requirement, as long as can realize the purpose of relaying.But repeater preferably is placed between ammeter.As a concrete example, repeater can comprise 45Mbps power line high-speed communication digit chip DSS4200 and each a slice of DSS5100 of DS2 company.
Equally, the downstream of a repeater can connect a plurality of user terminals.When having a plurality of user terminal, can constitute local area network (LAN) LAN (as shown in Figure 1) by repeater.Like this, for subscriber terminal equipment, repeater can be used as the local side apparatus of PLC local area network (LAN).In addition, repeater also can comprise a gateway module, gateway as household internal PLC network (user terminal or local area network (LAN)), thereby connect other data access service (as shown in Figure 1), such as ISDN (Integrated Services Digital Network, integrated services digital network), xDSL, CATV (CAble TeleVision, cable TV), or the like.
User terminal can be installed in the user family, office etc. located.It comprises power line interface I1 and user data interface I2, transmits data between power line interface I1 and data-interface I2.The major part of user terminal also is the high-speed figure modulator-demodulator.On the one hand, it is injected into signal in user's the power line by coupler; On the other hand, extract useful data-signal from power line.As a concrete example, subscriber terminal equipment can comprise the 45Mbps high speed power line communication digit chip DSS4200 of DS2 company.
Described data-interface can comprise the interface of one or more any kind, for example Ethernet interface, USB (Universal Serial Bus, universal serial bus structural) interface and telephone line interface, or the like.Diversified corresponding with interface can connect various user data equipment on the user terminal, realize various functions, and for example connect telephone set and realize ip voice communication (VoIP, Voice overIP), connect the computer access internet, or the like.
Described main website equipment can also comprise the module that realizes other miscellaneous function, for example router, VPN (Virtual Private Network, VPN), NAT (Network AddressTranslation, network address translation), DHCP (DHCP, Dynamic HostConfiguration Protocol) and fire compartment wall, or the like.
Explanation in passing, how the power consumption equipment in the top explanation on the not mentioned low-voltage power line connects, but as is known to the person skilled in the art, for power consumption equipment, the adding of communication function to its connected mode and occupation mode without any influence.
The method according to this invention when realizing transfer of data, is divided into three frequency ranges with the available system frequency range.According to local line transmission characteristic and network topology structure, determine to adopt which band transmissions power line data-signal.Following table 1 is the object lesson that frequency range is divided.
Table 1
Generally speaking, frequency range 1 is suitable for long-distance transmissions, and this frequency range meets the power line transmission frequency range of international mark tissue suggestion.Frequency range 2 is suitable for short-distance transmission, family's Intranet.Frequency range 3 is suitable for family's Intranet, so that insert other data network such as ADSL, CABLE etc.Frequency range 1 upset is suitable for using under the bad situation of frequency range 1 transmission signals, the uplink and downlink transmission band of frequency range 1 is exchanged, promptly use the downlink data of uplink band transmission band 1 upset of frequency range 1, use the upstream data of band downlink transmission band 1 upset of frequency range 1, as shown in Figure 2.The schematic diagram that Fig. 2 divides for frequency range.Because the frequency range border can change, so has only indicated frequency values roughly among the figure.As can be seen from the figure, roughly 1 to 10MHz is frequency range 1, and roughly 10 to 20MHz is frequency range 2, and roughly 20 to 30MHz is frequency range 3.Each frequency range is divided into uplink band (US) and band downlink (DS) again.Frequency range 1 upset is exactly up, the result that band downlink is changed with frequency range 1.
In the present invention, generally speaking, 1 upset of frequency range 1 and frequency range can be used for the transmission (promptly as aforementioned first frequency range) between main website equipment and the repeater, frequency range 2 or frequency range 3 are used for the transfer of data (promptly as aforementioned second frequency range) between repeater and the user terminal, and frequency range 3 is used for the transfer of data of the local area network (LAN) under the same repeater.But above-mentioned arrangement is not restrictive, and according to the concrete state of circuit, each PLC node can adopt other frequency range.For example, as described in preceding institute, first frequency range also can be higher than second frequency range.Again for example, the uplink band of other frequency range and band downlink also can be changed mutually.About determining of concrete frequency range, those of ordinary skills know, can determine by simple test at the scene fully: adopt the good frequency range of communication efficiency.
Need to prove that the division of above-mentioned frequency range is an example, should not be considered as limitation of the present invention.Those skilled in the art will know that, the quantity of frequency range and the border of frequency range can change, in fact can be arbitrary value, only in case adjust number of frequency bands and frequency range border, the relevant parameter that just needs corresponding adjustment device hardware, and this to be those skilled in the art can realize by the work of routine after knowing technology of the present invention.The border that it is further noted that each frequency range in the table is not connected fully, and this is to avoid some frequency for fear of disturbing other wireless service.If the frequency of other wireless service changes, perhaps there is not mutual interference problem owing to the situation in actual place, then need not to avoid described frequency, thereby can arbitrarily determine the border between each frequency range, and the border can be connected.In fact, the present invention is the available system frequency range is divided into a plurality of frequency sub-band in the main points aspect the frequency range use, selects suitable frequency sub-band according to the actual track condition for use at different PCL nodes.
In addition, determining and can carrying out when laying the low-voltage power line data communication system of described frequency sub-band perhaps carried out in low-voltage power line data communication system running in real time.
Low-voltage power line data communication system of the present invention preferably adopts the OFDM modulation system.That is to say that as shown in Figure 1, main website, repeater (its first communication equipment and second communication equipment) and user terminal all preferably include the OFDM modulation module.
OFDM is not a new technology, it has been widely used in many other communication systems, ADSL, VDSL (very-height-speed digital subscriber line for example, Very High Speed Digital Subscriber Line), DAB (digital audio broadcasting), DVB (digital video broadcasting) or the like, use the OFDM modulation technique can guarantee that signal under disadvantageous transmission conditions, reaches very high transmission rate.
Utilize the power line transmission signal can adopt the modulation system of a lot of forms, but after we have done a large amount of field tests, we think that the OFDM modulation system is adapted at carrying out on the power line signal transmission most, at first it has very strong anti-interference, secondly it can provide the highest frequency efficiency and performance, and particularly frequency selective attenuation and the time delay to interchannel has very strong anti-interference.This is the special case of multi-carrier communication, uses several subcarriers to communicate.It also is the modulation and the combination of multiplexing technique, can use 1000 or more carrier wave communicate, improved the flexibility of system.At this frequency a lot of interference is arranged in certain carrier transmission process, the frequency that we can use other instead communicates, and has avoided the interference of this frequency, has guaranteed the reliability of system communication.
So-called OFDM is exactly the subcarrier that available frequency band is divided into some low speed transmissions, is suitable as very much the modulation technique of high power capacity PLC system.Because OFDM does not need complicated equalizer, be an extremely promising modulation technique therefore.The basic thought of OFDM is divided into the plurality of sub channel to available channel bandwidth exactly, and each channel all can be similar to regards ideal communication channel as.Each subchannel adopts QAM (quadrature amplitude modulation) modulation low rate data streams.Because in ofdm system, mark space is very long, therefore has the ability of very strong anti-impulsive noise and quick decline.Divide channel available bandwidth branch into some narrow relatively subbands, its overall transmission rate is near the channel capacity of design.If the principle of the error rate equilibrium that guarantees each subchannel is followed in the selection of the bit (modulation level) that the power division between the substation and each symbol comprise, realize that so total speed maximization is possible.For the subchannel of low SNR (signal to noise ratio), adopt than low modulation level (being that the bit that comprises of each symbol is less), the subchannel of higher SNR adopts higher modulation level (being that the bit that comprises of each symbol is more).In Adaptive OFDM system,, adopt optimal modulation level and power division can realize the transfer of data of higher rate according to channel condition.In ofdm system, realize channel equalization, shorten the impulse response of efficient channel, the self adaptation adjusting of modulation level and the automatic distribution of power all need channel status is assessed.Along with becoming when utilizing and the enhancing gradually of the demand of frequency-selective channel transmitting high speed data, need not channel training and the method for learning just can discern a blind Channel has caused the interest that people are increasing.
By between the data block (symbol) of OFDM, inserting Cyclic Prefix (being called protection at interval); can alleviate the influence of the time dispersive characteristic that frequency-selective channel has; for fear of the OFDM intersymbol interference, the protection of OFDM at interval should be greater than the channel impulse response time.Have Cyclic Prefix in OFDM System and can eliminate intersymbol interference (ISI) and interchannel interference (ICI), and need not to adopt complicated equalizer.Insert the circulation stable state that Cyclic Prefix has brought wide region in ofdm signal, this can be used for the blind Channel identification of ofdm system.
Signal is made the circulation steady state process can improve Digital Signal Processing.The signal period characteristic that will set forth below circulation steady-state signal treatment technology has utilized.The circulation stable state has characterized the correlation between the frequency spectrum various piece that is in displaced condition.Utilize the inherent redundant of frequency spectrum correlation exploitation frequency spectrum, help under the communication environment of difficulty, carrying out various signal processing, as in PLC.Frequency spectrum is correlated with density (SCD) assessment and cycle specificity analysis for proposing an appropriate stable circulation signal processing method unusual key often.
Ofdm signal with prefix is exactly an example of circulation stable state.Ofdm signal x (t) is made up of the heavy QAM signal of N, is expressed as:
x(t)＝R
e{w(t)·e
j2πfct} (1.1)
Wherein fc is a sub-carrier frequencies, and w (t) is the complex envelope of the heavy QAM signal of N.Complex envelope with Cyclic Prefix in OFDM System signal is:
Wherein, (γ
N, k) being independent and equally distributed burst (being generally plural number), N is a number of subcarriers, and q (t) is the rectangular pulse of T for the duration, and Ts is the OFDM source signal cycle.The protection gap is Tg, and the duration that has protection complete ofdm signal at interval is T=Ts+Tg.The adding Cyclic Prefix can damage the orthogonality of multiple QAM signal.
Traditional OFDM is used for fixing sub-channel modulation.Yet in adaptive OFDM I subchannel (using the QAM modulation), each signal has identical transmission rate, is fs=1/Ts, but may have different modulation level Mi=2mi, and the transmitted bit number of each OFDM symbol is a constant:
Effectively the OFDM baseband modulation and demodulation has adopted discrete fourier inverse transformation/conversion, and Ts/N is the sampling interval.
Information signal is sequence of complex numbers { γ n, k}
In-phase component is a
C, m=Re{cm}, quadrature component is b
S, m=Im{ γ n, k} forms the complex signal (a of M unit
C, m, b
S, m), form
The rectangular signal set.
M unit's PSK (phase shift keying, the Phase-Shift Keying) homophase of signal and the cos-sin computing of quadrature component form the cycle signal set:
Therefore, M unit psk signal is the QAM signal of constant-envelope.And can reduce frequency-selective channel because the equalization problem that temporal dispersion causes with the modulation system of differential coding.
Typical Frequency Distribution data system is N nonoverlapping channel with frequency partition, because do not have overlapping, so there is not intercharacter interference, if but to do like this, the frequency efficiency of system is not high, says from another point of view, OFDM uses overlapping subcarrier communication, and different modulated carriers carries out quadrature, and quadrature makes carrier wave linear independent, and the carrier spacing is several times of 1/T.OFDM is made up of a lot of modulated sub-carriers, and modulation system can be PSK and QAM.45Mbps power line high-speed communication system uses m-QAM that each subcarrier is modulated.
Summary is got up, and the major advantage of OFDM modulation system is:
*The multipath channel decay that time delay is arranged on the power line there is the good restraining effect;
*The speed of each carrier wave can be determined the speed of each subcarrier according to the state of signal-to-noise that monitors at this frequency;
*Disturbing only can influence some carrier waves and remaining subcarrier still can guarantee reliable communication;
For 45Mbps power line high-speed communication system, the carrier number of each transmission band is: 512 carrier waves of up channel, 768 carrier waves of down channel, 1280 carrier waves altogether.That is to say each frequency range (frequency range l, frequency range 2, frequency range 3, frequency range 1 upset) 1280 subcarriers is all arranged, 45Mbps power line high-speed communication system is according to the quality factor of each user and each carrier wave, and modulation parameter can be adjusted in real time, and the assurance system can be normally, communicate by letter reliably.
Need to prove, be that example describes with the 45Mbps system above, still, shows and suggestion, and transmission rate can be any speed.
In conjunction with the accompanying drawings embodiments of the invention are described in detail above.As can be seen, with respect to existing high speed power line communication system, electric line communication system of the present invention has the following advantages:
1. owing to use repeater, reduced the signal attenuation when communication distance increases, thereby effectively increased the communication distance of system, do not had distance limit in theory, thereby can satisfy the online high-speed data transmission of Information of low-voltage power in the same distribution transformer scope;
2. by the segmentation of frequency range, can select employed frequency range, have very strong networking flexibility, and shared spectrum width be less than 10MHz according to the actual track situation;
3. further, by adopting the OFDM technology, can solve noise and interference problem on the power line well, make that the transmission rate on each frequency sub-band can reach 45Mbps;
4. by being equipped with supplementary module, can make system possess perfect Network Management Function, compatibility standard agreement (as SNMP etc.), but telemonitoring and adjust device parameter; Also can the user be divided into different VLANs by VLAN (VLAN, Virtual LAN) is set.VLAN can be isolated various flows, avoids the influence of broadcast packet to network performance.Also can support QoS (service quality, quality of service) to be provided with, can guarantee the crucial service quality of using (as voice, Video Applications etc.), other common application also can obtain service simultaneously.
It should be noted that protection scope of the present invention only is subjected to the restriction of claims, rather than the restriction of specification the disclosed embodiments.For those of ordinary skill in the art, can on the disclosed basis of this specification, make some still changes within protection range of the present invention fully.
Claims (16)
1. low-voltage power line data communication system comprises:
Main website equipment is connected with the low-voltage power line coupling and with data network, transmits data as gateway between low-voltage power spider lines and data network;
The user terminal that comprises power line interface and user data interface is used for transmitting data between power line interface and user data interface;
It is characterized in that:
This communication system also comprises repeater, repeater is coupled with low-voltage power line between main website equipment and user terminal, be used for the data-signal that relaying main website equipment sends, this repeater comprises first communication equipment of communicating by letter with first frequency range with main website equipment and the second communication equipment of communicating by letter with second frequency range with user terminal.
2. communication system as claimed in claim 1 is characterized in that, described main website equipment, user terminal, first communication equipment and second communication equipment include the OFDM modulation module.
3. communication system as claimed in claim 1 is characterized in that, described main website equipment also comprises network management module, is used for using the equipment of snmp management low-voltage power spider lines.
4. communication system as claimed in claim 1 is characterized in that described repeater also comprises gateway module, is used to connect other data access service.
5. communication system as claimed in claim 1 is characterized in that, the user data interface in the described user terminal comprises at least a with in the lower interface: Ethernet interface, USB interface, telephone line interface.
6. communication system as claimed in claim 1 is characterized in that, each repeater downstream connects a plurality of described user terminals, and each user terminal constitutes local area network (LAN) by this repeater.
7. communication system as claimed in claim 1 is characterized in that, described main website equipment also comprises at least a with in the lower module: router, VPN functional module, nat feature module, DHCP functional module, fire compartment wall.
8. method at the enterprising row data communication of low-voltage power line comprises:
Main website equipment is provided, is connected, between low-voltage power spider lines and data network, transmit data as gateway with the low-voltage power line coupling and with data network;
The user terminal that comprises power line interface and user data interface is provided, is used between power line interface and user data interface, transmitting data;
It is characterized in that:
Also be provided at the repeater that is coupled with low-voltage power line between main website equipment and the user terminal, be used for the data-signal that relaying main website equipment sends,
Wherein, this repeater is with first frequency range and main website devices communicating, with second frequency range and user terminal communication.
9. method as claimed in claim 8 is characterized in that, described The data OFDM modulation.
10. method as claimed in claim 8 is characterized in that the available system frequency range is made up of a plurality of frequency sub-band, determines according to the condition of respective lines which frequency sub-band described first frequency range, second frequency range adopt respectively.
11. method as claimed in claim 8 is characterized in that, connects a plurality of described user terminals in each repeater downstream, each user terminal constitutes local area network (LAN) by this repeater.
12. method as claimed in claim 11 is characterized in that, the available system frequency range is made up of a plurality of frequency sub-band, determines according to the condition of respective lines which frequency sub-band communicating by letter in described first frequency range, second frequency range and the described local area network (LAN) adopts respectively.
13., it is characterized in that the step of described definite frequency sub-band is carried out, and perhaps carries out in real time as claim 10 or 12 described methods in low-voltage power line data communication system running when laying the low-voltage power line data communication system.
14., it is characterized in that each in the described frequency sub-band is divided into uplink band and band downlink respectively as claim 10 or 12 described methods.
15. method as claimed in claim 14 is characterized in that, exchanges described uplink band and band downlink according to the condition of respective lines.
16. method as claimed in claim 15 is characterized in that, exchanges the step of described uplink band and band downlink and carries out when laying the low-voltage power line data communication system, perhaps carries out in real time in low-voltage power line data communication system running.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100366404A CN100521568C (en) | 2004-04-29 | 2004-04-29 | Low-voltage power line data communication system and method |
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| CNB2004100366404A CN100521568C (en) | 2004-04-29 | 2004-04-29 | Low-voltage power line data communication system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102118338B (en) * | 2009-12-31 | 2013-08-07 | 深圳先进技术研究院 | Power line carrier (PLC) communication method and device |
| CN102740035A (en) * | 2012-06-11 | 2012-10-17 | Tcl集团股份有限公司 | Multimedia peripheral managing terminal and multimedia playing system |
| CN108476038B (en) * | 2015-12-30 | 2021-10-15 | 华为技术有限公司 | Signal detection method, first network equipment, power supply equipment and system thereof |
| CN107733467A (en) * | 2017-10-19 | 2018-02-23 | 成都汉度科技有限公司 | Intelligent Building System based on bandwidth carrier |
| CN113225105B (en) * | 2021-04-25 | 2022-09-16 | 深圳友讯达科技股份有限公司 | Low-voltage power line broadband carrier communication frequency avoiding method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5491463A (en) * | 1993-06-28 | 1996-02-13 | Advanced Control Technologies, Inc. | Power line communication system |
| CN1312621A (en) * | 2001-04-26 | 2001-09-12 | 北京四方华能电网控制系统有限公司 | Integral power distribution power line carrier equipment |
| CN1345126A (en) * | 2000-09-20 | 2002-04-17 | 海尔集团公司 | Power line carrier communicator |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5491463A (en) * | 1993-06-28 | 1996-02-13 | Advanced Control Technologies, Inc. | Power line communication system |
| CN1345126A (en) * | 2000-09-20 | 2002-04-17 | 海尔集团公司 | Power line carrier communicator |
| CN1312621A (en) * | 2001-04-26 | 2001-09-12 | 北京四方华能电网控制系统有限公司 | Integral power distribution power line carrier equipment |
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