CN102571654B - Multi-carrier frequency self-adaptive power line communication system and method - Google Patents
Multi-carrier frequency self-adaptive power line communication system and method Download PDFInfo
- Publication number
- CN102571654B CN102571654B CN201110458568.4A CN201110458568A CN102571654B CN 102571654 B CN102571654 B CN 102571654B CN 201110458568 A CN201110458568 A CN 201110458568A CN 102571654 B CN102571654 B CN 102571654B
- Authority
- CN
- China
- Prior art keywords
- carrier
- signal
- communication
- multiple radio
- radio frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The invention discloses a multi-carrier frequency self-adaptive power line communication system which comprises a sending device, a receiving device, and an electric power transmission line respectively connected with the sending device and the receiving device, wherein the sending device comprises a plurality of modulation units, a synthesis unit, and a plurality of switches; and the receiving device comprises a filtering separator, a plurality of demodulate units, a plurality of bit synchronizer, and a plurality of frame header detectors. The invention further discloses a multi-carrier frequency self-adaptive power line communication method which comprises the following step: baseband signals are respectively modulated to at least one carrier frequency of a plurality of selectable frequency carriers for transmission, the space between the frequencies are larger, and a receiving end can correspondingly perform multichannel demodulation. According to the system and the method provided by the invention, an ideal communication frequency at which communication is performed can be found in an unknown power line channel by both communication parties in a tentative communication manner, thereby greatly improving the communication success probability.
Description
Technical field
The present invention relates to a kind of electric line communication system and method, especially a kind of multiple radio frequency adaptive electro line of force communication system and method.
Background technology
Power line communication is that signal of communication is coupled to the communication technology of transmitting on power transmission line.Traditional power line communication technology is used the modulating modes such as FSK or BPSK, modulates the signal in fixing carrier frequency and transmits, 120kHz for example, 270kHz etc.But conventionally power transmission line is because loaded power load is different, and the factor such as network topology structure, for different carrier frequencies, there are different attenuation characteristic and noise situations.And this attenuation characteristic relevant to carrier frequency and noise characteristic can be thought random with uncertain.Therefore,, if use fixing carrier frequency on a certain section of power transmission line circuit, may just in time drop on " valley point " of this section of power line channel attenuation characteristic because of the carrier frequency of its use and cause communication failure.If Fig. 1 is one section of power line communication attenuation characteristic curve figure that uses apparatus measures, in figure, show near 400kHz and have one " valley point ", near any use 400kHz, the power line communications apparatus of frequency for communication all can be failed.In prior art, also have some existing power line communication technologies to use two or more communication frequencys, but they all exist the problem of several respects below:
1, the communication frequency distance of using is too near, for example 115kHz and 131kHz, communication frequency is mutually by too near, the relevant similarity possibility of its transmission characteristic is just very large, likely occur two frequencies otherwise all work fine, all inoperable situation, has lost the meaning that multiple radio frequency is communicated by letter;
2, the communication technology of these multiple radio frequencies is not adaptive, that is to say that recipient must know which carrier frequency transmit leg is specifically used communicate by letter with ready in advance in advance, if receiving-transmitting sides is not appointed in advance, so likely there is transmit leg frequency of utilization A, and recipient is adjusted at the state of receive frequency B, and can not success communication.And in power line communication environment, this " agreement in advance " do not have often condition to realize, since because both sides can not set up basic communication because frequency is inconsistent, just cannot transmit " using which carrier frequency " this information yet.If unified, by fixing Frequency Transfer appointed information, exist again the dependence to fixed frequency upper signal channel attenuation characteristic, generally speaking cannot give full play to the feature of multi-frequency communication.
Summary of the invention
In order to solve the problems of the technologies described above, the object of the present invention is to provide a kind of multiple radio frequency adaptive electro line of force communication system and method, use the mode of single carrier wave frequency for communication to be improved to transmit leg transmit leg of the prior art and use any one or more communication mode in a plurality of alternative carrier frequencies, and recipient can not detect and demodulation the signal in used carrier frequency in the situation that knowing that in advance which carrier frequency transmit leg used, also be, transmit leg can be selected arbitrarily and combination in any carrier frequency, recipient can receive adaptively.
To achieve these goals, the invention provides a kind of multiple radio frequency adaptive electro line of force communication system of utilizing, comprise dispensing device, receiving system, respectively with the power transmission line of described dispensing device and receiving system coupling, wherein:
Dispensing device comprises:
Respectively baseband signal is modulated to a plurality of modulating units on different frequency carrier wave;
By the synthesis unit of the multichannel carrier modulation signal stack of a plurality of described modulating unit outputs, after stack, the signal of communication of output transmits by described power transmission line after treatment;
A plurality of switches, it is respectively connected to a described modulating unit, in order to control the On/Off of this modulating unit;
Receiving system comprises:
The signal of communication from described power transmission line is after treatment separated into the filtering separator of multichannel carrier modulation signal;
With a plurality of demodulating units that described filtering separator is connected, its Ge Jiang mono-road carrier (boc) modulated signals is converted to demodulated base band signal, and the number of described demodulating unit is identical with described modulating unit;
A plurality of bit synchronizers, it is respectively connected to a described demodulating unit, for obtaining the bit decision value of the baseband signal of this demodulating unit output;
A plurality of preamble detecting devices, it is respectively connected to a described bit synchronizer, for the bit decision value that this bit synchronizer is obtained, carries out relevant comparison calculation to frame head data,
Data processing unit, if the result of described relevant comparison calculation is consistent, starts to receive described demodulated base band signal.
As preferably, between described synthesis unit and described power transmission line, be connected with D/A converter, the first power amplifier, the first coupling circuit in turn, between described power transmission line and described filtering separator, be connected with the second coupling circuit, the second power amplifier, A/D converter in turn.
As preferably, described modulating unit is modulation multiplier.
As preferably, described demodulating unit is with carrier wave multiplier frequently.
The present invention also provides a kind of multiple radio frequency adaptive electro line of force communication means, comprises the following steps:
By switch, control baseband signal is modulated at least one carrier frequency in a plurality of alternative carrier frequencies, obtain at least one road carrier (boc) modulated signals;
After at least one road carrier (boc) modulated signals obtaining after modulation is superposeed, the signal of communication of output sends on power transmission line after treatment;
The signal of communication from described power transmission line is after treatment separated into at least one road carrier (boc) modulated signals;
Each road carrier (boc) modulated signals after separation is carried out to carrier wave demodulation and convert at least one road demodulated base band signal to;
For demodulated base band signal described in each road, carry out respectively bit synchronization to obtain its bit decision value, and this bit decision value is carried out to relevant comparison calculation to frame head data, if operation result is the corresponding road demodulated base band signal that starts to receive in full accord.
As preferably, described a plurality of alternative carrier frequencies are selected from the carrier frequency between 3kHz to 500kHz, for example, can be 131.58KHz, 263.16KHz, these four carrier frequencies of 312.5KHz, 416.67KHz.
As preferably, described bit synchronization utilizes the zero passage of baseband signal constantly by Garnder algorithm, to realize.
As preferably, describedly also comprise before starting to receive a corresponding road demodulated base band signal, send the notice of ready-to-receive signal.
Compared with prior art, the beneficial effect of multiple radio frequency adaptive electro line of force communication system of the present invention and method is: overcome the dependence to single fixed communication carrier frequency in conventional electric power line communication technology, use is selected from the carrier frequency between 3kHz to 500kHz, 131.58kHz for example, 263.16kHz, 312.5kHz, these four available carrier frequencies of 416.67kHz, these four frequencies are distributed in the almost gamut that China national electrical network allows the band limits (3k is to 500kHz) that power line communication used from low to high.Due to these four carrier frequency apart from each others separated from one another, can think that its transmission attenuation characteristic and noise characteristic have nothing to do each other, hardly may " valley point " of while in fading channel.Again because recipient can be to using the one or more signal of communication adaptive reception in these four carrier frequencies, therefore the communicating pair in one section of unknown power line channel can be by exploratory communication, find most suitable communication frequency to communicate, can greatly improve the communication probability of success.
Accompanying drawing explanation
Fig. 1 is one section of power line communication attenuation characteristic curve figure that uses apparatus measures in prior art;
Fig. 2 is the dispensing device structure principle chart of the multiple radio frequency adaptive electro line of force communication system of embodiments of the invention;
Fig. 3 is the receiving system structure principle chart of the multiple radio frequency adaptive electro line of force communication system of embodiments of the invention;
Fig. 4 is the schematic flow sheet of the multiple radio frequency adaptive electro line of force communication means of embodiments of the invention.
Main description of reference numerals
1-modulates link
1-1,1-2,1-3,1-4 modulate multiplier
2-adder 3-filtering separator
4-power transmission line
5-demodulation link
5-1,5-2,5-3,5-4 digital phase-locked loop
6-bit synchronizer 7-preamble detecting device
8-digital to analog converter 9-the first power amplifier
10-first coupling circuit 11-the second coupling circuit
12-the second power amplifier 13-analog to digital converter
14-base band formed filter
Embodiment
Below in conjunction with the drawings and specific embodiments, multiple radio frequency adaptive electro line of force communication system and the method thereof of embodiments of the invention are described in further detail, but not as a limitation of the invention.
Fig. 2 is the dispensing device structure principle chart of the multiple radio frequency adaptive electro line of force communication system of embodiments of the invention, the receiving system structure principle chart of the multiple radio frequency adaptive electro line of force communication system that Fig. 3 is embodiments of the invention.As shown in Figures 2 and 3, the multiple radio frequency adaptive electro line of force communication system of embodiments of the invention, comprise dispensing device, receiving system, respectively with the power transmission line of described dispensing device and receiving system coupling, wherein: dispensing device comprises modulation link 1, modulation link 1 is realized by a plurality of modulating units that baseband signal is modulated to respectively on different frequency carrier wave, dispensing device also comprises the adder 2 of the multichannel bandpass signal stack of a plurality of modulating unit outputs, bandpass signal after stack transmits to receiving system by power transmission line 4, and a plurality of each modulating units that are connected to are to control the switch of its opened/closed, receiving system comprises the filtering separator 3 of the separated bandpass signal from power transmission line 4, filtering separator 3 is connected with demodulation link 5, demodulation link comprises a plurality of demodulating units, the number of demodulating unit is identical with modulating unit, each demodulating unit is connection bit synchronizer 6 respectively, and bit synchronizer 6 and bit decision value for bit synchronizer 6 is obtained are connected with the preamble detecting device 7 of fixing frame head data comparison calculation.As a kind of case of preferably putting of the present embodiment, modulating unit is modulation multiplier 11,12,13,14, and demodulating unit be with carrier wave multiplier frequently, for example digital phase-locked loop or quadratic loop, the present embodiment employing be digital phase-locked loop 51,52,53,54.
Before modulation link 1, be equipped with base band formed filter 14, between adder 2 and power transmission line 4, be connected with D/A converter 8, the first power amplifier 9, the first coupling circuit 19 in turn, between power transmission line 4 and filtering separator 3, be connected with the second coupling circuit 11, the second power amplifier 12, A/D converter 13 in turn.
Fig. 4 is the schematic flow sheet of the multiple radio frequency adaptive electro line of force communication means of embodiments of the invention.In conjunction with the multiple radio frequency adaptive electro line of force communication system of the embodiment of the invention described above, invention is described in further detail.As shown in Figure 4, the multiple radio frequency adaptive electro line of force communication means of embodiments of the invention, comprises the following steps:
1) modulating unit of baseband signal being given respectively to a plurality of carrier frequencies carries out carrier modulation, described a plurality of modulating unit is subject to switch separately to control and can open or close arbitrarily, open and represent that baseband signal will be modulated by the carrier frequency signaling on this road, in the bandpass signal composition of final output, will have the carrier frequency on this road; Close and represent that baseband signal can not modulated by the carrier frequency signaling on this road, the bandpass signal composition of final output will not contain the carrier frequency on this road;
2) bandpass signal after modulation is superimposed through an adder respectively, becomes analog waveform through digital-to-analogue conversion, then sends on power transmission line after power amplifier amplifies;
3) on power transmission line, the bandpass signal after stack is given analog to digital converter and is become digital signal after power amplifier amplifies, separated and be reduced into and above-mentioned steps 2 through filtering separator) corresponding multichannel bandpass signal before;
4) each the road bandpass signal after separated first all carries out carrier wave demodulation through a demodulating unit separately and converts baseband signal to, then through bit synchronizer, obtain bit decision value, give preamble detecting device, because signal transmits with frame format, the data format of frame head is fixed, the effect of preamble detecting device is constantly bit decision value to be done to relevant comparison calculation to fixing frame head data, as in full accord, think and start the baseband signal after receiving demodulation, as inconsistent, feed back operation result.After frame originating point information being detected, can provide cue, notice is responsible for the digital processing element of for example microprocessor of data receiver and is prepared to meet follow-up data.Owing to receiving cue, be respectively effectively, therefore no matter which carrier frequency transmit leg is used carry out carrier modulation transmission, as long as signal is not fallen by complete attenuation or signal to noise ratio meets the requirements, recipient can both detect also demodulation out, the prior agreement that does not need both sides, has met adaptive needs.
The modulating unit of baseband signal being given respectively to a plurality of carrier frequencies carries out in carrier modulation process, and a plurality of alternative carrier frequencies are selected from the carrier frequency between 3kHz to 500kHz.As improvement, described a plurality of alternative carrier frequencies are selected from the carrier frequency between 100kHz to 500kHz.
As the preferred embodiments of the present invention, can abandon the strong noise region lower than 100kHz, a plurality of alternative carrier frequencies are chosen to be to for example 131.58KHz, 263.16KHz, these four carrier frequencies of 312.5KHz, 416.67KHz, corresponding demodulating unit is four, carries out demodulation respectively for these four frequencies.Due to these four carrier frequency apart from each others separated from one another, can think that its transmission attenuation characteristic and noise characteristic have nothing to do each other, hardly may " valley point " of while in fading channel.Again because recipient can be to using the one or more signal of communication adaptive reception in these four carrier frequencies, therefore the communicating pair in one section of unknown power line channel can be by exploratory communication, find most suitable communication frequency to communicate, can greatly improve the communication probability of success.For example, for one section of unknown power line channel, suppose that the probability of any one carrier frequency in its transmission " valley point " is 50%, the communication success rate of using the power line communication product of single carrier wave frequency for communication is 50%; And the communication success rate that adopts the power line communication product of multiple radio frequency self-adaptive electric power line communication technology of the present invention will reach 1-0.5*0.5*0.5*0.5 93.75%.
As further improvement, baseband signal is carried out respectively to the process of carrier modulation, be that it is modulated by the modulation multiplier of a plurality of carrier frequencies respectively; The process that each road bandpass signal after separated carries out demodulation, be by it respectively by carrying out demodulation with carrier wave multiplier frequently, this with carrier wave multiplier frequently for the frequency frequency of correspondingly modulating for described modulation multiplier respectively.The same frequency carrier wave multiplier here can be classical costas digital phase-locked loop, the single carrier phase-locked loops such as quadratic loop.Base band signal process after demodulation is all the same, and bit synchronization can utilize the zero passage of baseband signal constantly by classical Garnder algorithm or other modes, to realize.
Before the modulating unit of giving respectively a plurality of carrier frequencies by baseband signal carries out carrier modulation, baseband signal is for adopting base band formed filter to process and form unified baseband waveform signal information data to be sent.
Compare with power line carrier communication system of the prior art, multiple radio frequency adaptive electro line of force communication system of the present invention and method, overcome the dependence to single fixed communication carrier frequency in conventional electric power line communication technology, use a plurality of carrier frequencies of apart from each other separated from one another, make it hardly " valley point " in fading channel simultaneously.Again because recipient can be to using the one or more signal of communication adaptive reception in these four carrier frequencies, therefore the communicating pair in one section of unknown power line channel can be by exploratory communication, find most suitable communication frequency to communicate, can greatly improve the communication probability of success.
Above embodiment is only exemplary embodiment of the present invention, is not used in restriction the present invention, and protection scope of the present invention is defined by the claims.Those skilled in the art can make various modifications or be equal to replacement the present invention in essence of the present invention and protection range, this modification or be equal to replacement and also should be considered as dropping in protection scope of the present invention.
Claims (9)
1. a multiple radio frequency adaptive electro line of force communication system, is characterized in that, comprise dispensing device, receiving system, respectively with the power transmission line of described dispensing device and receiving system coupling, wherein:
Dispensing device comprises:
Respectively baseband signal is modulated to a plurality of modulating units on different frequency carrier wave, this different frequency is selected from the carrier frequency between 3kHz to 500kHz;
By the synthesis unit of the multichannel carrier modulation signal stack of a plurality of described modulating unit outputs, after stack, the signal of communication of output transmits by described power transmission line after treatment;
A plurality of switches, it is respectively connected to a described modulating unit, in order to control the On/Off of this modulating unit;
Receiving system comprises:
The signal of communication from described power transmission line is after treatment separated into the filtering separator of multichannel carrier modulation signal;
With a plurality of demodulating units that described filtering separator is connected, its Ge Jiang mono-road carrier (boc) modulated signals is converted to demodulated base band signal, and the number of described demodulating unit is identical with described modulating unit;
A plurality of bit synchronizers, it is respectively connected to a described demodulating unit, for obtaining the bit decision value of the baseband signal of this demodulating unit output;
A plurality of preamble detecting devices, it is respectively connected to a described bit synchronizer, for the bit decision value that this bit synchronizer is obtained, carries out relevant comparison calculation to frame head data;
Data processing unit, if the result of described relevant comparison calculation is consistent, starts to receive described demodulated base band signal.
2. multiple radio frequency adaptive electro line of force communication system according to claim 1, it is characterized in that, between described synthesis unit and described power transmission line, be connected with D/A converter, the first power amplifier, the first coupling circuit in turn, between described power transmission line and described filtering separator, be connected with the second coupling circuit, the second power amplifier, A/D converter in turn.
3. multiple radio frequency adaptive electro line of force communication system according to claim 1, is characterized in that, described modulating unit is modulation multiplier.
4. according to the multiple radio frequency adaptive electro line of force communication system described in any one in claims 1 to 3, it is characterized in that, described demodulating unit is with frequency carrier wave multiplier.
5. a multiple radio frequency adaptive electro line of force communication means, is characterized in that, comprises the following steps:
By switch, controlled baseband signal is modulated at least one carrier frequency in a plurality of alternative carrier frequencies, obtain at least one road carrier (boc) modulated signals, described a plurality of alternative carrier frequencies are selected from the carrier frequency between 3kHz to 500kHz;
After at least one road carrier (boc) modulated signals obtaining after modulation is superposeed, the signal of communication of output sends on power transmission line after treatment;
The signal of communication from described power transmission line is after treatment separated into at least one road carrier (boc) modulated signals;
Each road carrier (boc) modulated signals after separation is carried out to carrier wave demodulation and convert at least one road demodulated base band signal to;
For demodulated base band signal described in each road, carry out respectively bit synchronization to obtain its bit decision value, and this bit decision value is carried out to relevant comparison calculation to frame head data, if operation result is the corresponding road demodulated base band signal that starts to receive in full accord.
6. multiple radio frequency adaptive electro line of force communication means according to claim 5, is characterized in that, described a plurality of alternative carrier frequencies are selected from the carrier frequency between 100kHz to 500kHz.
7. multiple radio frequency adaptive electro line of force communication means according to claim 5, is characterized in that, described a plurality of alternative carrier frequencies are 131.58KHz, 263.16KHz, these four carrier frequencies of 312.5KHz, 416.67KHz.
8. multiple radio frequency adaptive electro line of force communication means according to claim 5, is characterized in that, described bit synchronization utilizes the zero passage of baseband signal constantly by Garnder algorithm, to realize.
9. multiple radio frequency adaptive electro line of force communication means according to claim 5, is characterized in that, described start to receive before a corresponding road demodulated base band signal also comprise, send the notice of ready-to-receive signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110458568.4A CN102571654B (en) | 2011-12-31 | 2011-12-31 | Multi-carrier frequency self-adaptive power line communication system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110458568.4A CN102571654B (en) | 2011-12-31 | 2011-12-31 | Multi-carrier frequency self-adaptive power line communication system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102571654A CN102571654A (en) | 2012-07-11 |
| CN102571654B true CN102571654B (en) | 2014-08-13 |
Family
ID=46416148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110458568.4A Active CN102571654B (en) | 2011-12-31 | 2011-12-31 | Multi-carrier frequency self-adaptive power line communication system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102571654B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103095340B (en) * | 2012-12-12 | 2015-05-20 | 广东电网公司电力科学研究院 | Low voltage power line carrier interconnection and intercommunication device |
| CN103607224B (en) * | 2013-12-02 | 2015-09-23 | 国家电网公司 | Set up the method for power-line carrier communication system two-way link |
| CN103747538B (en) * | 2014-01-09 | 2017-02-15 | 京信通信系统（中国）有限公司 | Self-adaption carrier wave separation method and device |
| CN107431861B (en) * | 2015-04-02 | 2021-03-09 | 杜比实验室特许公司 | Distributed amplification for adaptive audio rendering systems |
| EP3283848B1 (en) * | 2015-04-17 | 2019-06-05 | Landis+Gyr AG | An electricity meter and an adaptor module therefor |
| CN105933079B (en) * | 2016-06-01 | 2018-07-20 | 国网河北省电力公司电力科学研究院 | Detection system and detection method for communication performance of carrier signals with different frequencies |
| KR101977783B1 (en) * | 2017-10-17 | 2019-05-13 | 주식회사 케이엠더블유 | Method and Apparatus for Compensating Power Amplifier Performance |
| TWI693512B (en) * | 2018-11-16 | 2020-05-11 | 緯穎科技服務股份有限公司 | Server device and power management method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101394200A (en) * | 2008-11-11 | 2009-03-25 | 国网电力科学研究院 | Zero frequency conversion and adaptive frequency selecting power line carrier data transmission method |
| US7912139B2 (en) * | 2006-04-03 | 2011-03-22 | Panasonic Corporation | Multi-carrier communication apparatus, power line communication circuit, and multi-carrier communication method |
| CN102263766A (en) * | 2011-08-29 | 2011-11-30 | 清华大学 | Frequency division multiple access method of variable-bandwidth FMT (frequency modulated transmitter) based on single-carrier transmission |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007214890A (en) * | 2006-02-09 | 2007-08-23 | Matsushita Electric Ind Co Ltd | Device and system for power line communication |
-
2011
- 2011-12-31 CN CN201110458568.4A patent/CN102571654B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7912139B2 (en) * | 2006-04-03 | 2011-03-22 | Panasonic Corporation | Multi-carrier communication apparatus, power line communication circuit, and multi-carrier communication method |
| CN101394200A (en) * | 2008-11-11 | 2009-03-25 | 国网电力科学研究院 | Zero frequency conversion and adaptive frequency selecting power line carrier data transmission method |
| CN102263766A (en) * | 2011-08-29 | 2011-11-30 | 清华大学 | Frequency division multiple access method of variable-bandwidth FMT (frequency modulated transmitter) based on single-carrier transmission |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102571654A (en) | 2012-07-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102571654B (en) | Multi-carrier frequency self-adaptive power line communication system and method | |
| US7986711B2 (en) | System and method for data communication over power lines | |
| CN100512252C (en) | Method using a training sequence, transmitter and communication system | |
| JPH10512733A (en) | Burst mode preamble | |
| EP1747630A2 (en) | Mapping data tones onto guard tones for a multi-band ofdm system | |
| KR20180010057A (en) | Simultaneous Wireless Information and Power Transmission Method, Transmission Apparatus and Receive Apparatus using the Same | |
| WO2021104312A1 (en) | Method for transmitting synchronization pulse, device, and system | |
| EP1687993A2 (en) | Brudged ultra-wideband communication method and apparatus | |
| WO2012037751A1 (en) | Quick access short distance radio communication system and method for controlling communication range | |
| CN104202066B (en) | A kind of Differential Frequency Hopping Communication method and system based on cognitive radio | |
| KR20030051761A (en) | Apparatus for receiving and recovering frequency shift keyed symbols | |
| CN103888404B (en) | A kind of entire spectrum carrier modulating method based on frequency spectrum shift | |
| CN102025398B (en) | Wired carrier communication method and device | |
| US9941914B2 (en) | Receiving device, communication system, and interference detection method | |
| US20130107976A1 (en) | Communication device and communication system | |
| EP2469790B1 (en) | Method, combiner and system for transmitting signals | |
| CN102195664B (en) | Multi-path microwave digital receiver | |
| CN103036594B (en) | Electric line communication system | |
| US7574184B2 (en) | Method and device for detecting occupation by a signal of an adjacent channel | |
| CN202475478U (en) | Multi-carrier-frequency power line communication system | |
| CN202261286U (en) | Self-adaptive modulator-demodulator on basis of time diversity | |
| US8923438B1 (en) | Dual rate communication | |
| WO2008074190A1 (en) | Receiving, transmitting method for bluetooth signal and bluetooth transceiver therein | |
| CN104363033B (en) | It is a kind of to use pulse modulated power line communication method | |
| JP5212638B2 (en) | Power line carrier communication system and power line carrier communication apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |