CN102710385B - A kind of transmitting terminal, receiving terminal, system and method for contact line power line communication - Google Patents
A kind of transmitting terminal, receiving terminal, system and method for contact line power line communication Download PDFInfo
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Abstract
The invention discloses a kind of transmitting terminal, receiving terminal, system and method for contact line power line communication, belong to railway communication, city rail communication technical field.Transmitting terminal comprises with lower module: an application layer encoder, receives source information, and provides encoded data stream, and application layer encoder packet is containing CRC coding and the cascade of fountain codes coding; A physical layer encoder, receives application layer encoder data stream, has forward error correction coding function; A physical layer modulator, i.e. OFDM modulation device, receive physical layer encoder data flow, and produce output signal by OFDM modulation mode.The invention also discloses corresponding receiving terminal, system and sending, receiving method.By the combination of fountain codes cross-layer technology and physical layer channel code, OFDM modulation technology, the five kinds of noise problems, particularly fountain codes cross layer design that solve general power line communication solve the break-make of contact line channel and the pantagraph current collector interference problem by contact line electric spark impulsive noise.
Description
Technical field
The present invention relates to railway signal communication city rail signal communication technical field, particularly relate to a kind of transmitting terminal, receiving terminal, system and method for contact line power line communication.
Background technology
The most important theme of railway transportation is exactly safety and efficiency, and signal communications system is exactly raise the efficiency the important prerequisite ensureing safety.At present, car-ground information transmission mode mainly comprises track circuit, Cable loop, leaky waveguide, inquiry response device, radio communication etc.These traditional communication modes respectively have pluses and minuses, likely owing to being subject to geologic structure, track pollutes the impact of the factor such as corrosion, locomotive traction current interference and signal is obstructed, and also signalling arrangement may be caused malfunctioning due to external force such as thunderstorm mud-rock flows.Disclosed technology uses the stable contact line of physical structure to carry out the transmission of signal at present.
1) power source of electric railway and city rail is all electric energy, the tractive power supply system of electric railway and city rail is structurally different, but its principle does not have much difference, its tractive power supply system is mainly all made up of traction substation and contact line two large divisions.In general, what the contact line of electric railway adopted is overhead contact line, and the form of the existing employing overhead contact line of the contact line of city rail, also there is the form adopting the conductor rail of floor file also to claim the 3rd rail.Pantagraph current collector on car by with contact line reliably sliding contact flowed, constantly obtain electric energy, to maintain the stable operation of electric EMU.Electric railway slides by bow formula pantagraph current collector and overhead type contact line to be flowed, and contacts the pantagraph current collector of rail also known as collector shoe, and electric EMU stretches out collector shoe and conductor rail sliding contact by locomotive side and obtains electric energy.
In the traction generator of China's electric railway, high voltage transmission line is generally about 110 kilovolts, feed line is 27 kilovolts, and contact line maximum operating voltage is 27.5 kilovolts, instantaneous maximum is 29 kilovolts, and minimum operating voltage is 20 kilovolts, under abnormal condition, General Requirements must not lower than 19 kilovolts, and be single phase industrial frequence electric current.The contact line of city rail or the electric pressure of conductor rail are generally 1500V or 750V.China's electric railway generally adopts single phase industrial frequence Alternating Current Power Supply standard, and balance to make electric power system threephase load and improve electrical network utilization ratio simultaneously, its contact line adopts commutation sectional power supply mechanism.Therefore, contact line is at every 20 to 25 kms of direct-furnish section, every 40 to 50 kms of AT supply power mode section, the phase-separating section of 90 to 200 meters will be set according to design specification, and some supply power mode employings is single side feeding, so contact line generally can disconnect in the middle of two adjacent traction substations, power supply area is divided into two sections, and each power-feed section only obtains electric energy from the electric substation of side.In order to realize the flexibility of powering and reduce the requirement of accident impact scope and interruption maintenance contact line, contact line is also provided with many section points do not marked on figure.Therefore, from the angle of Signal transmissions, the segmentation of these phase-separating sections, section point and power supply area all can cause the interruption of signal transmission passage, Fig. 1 to be electric railway traction generator.
When bow net slides or collector shoe and track slide, pantagraph current collector and the instantaneous disconnection of contact line also can be made because the irregularity of contact line and pantograph or collector shoe vibrate.Under worse condition, even also can make pantograph or produce electric arc between collector shoe and contact line, occur an of short duration hard pulse, this not only has an impact to the current carrying quality of contact line, cannot error correction restore time the damage of this hard pulse to packet is most of.The pollution of noise when the pulse produced with electric arc off and on of pantagraph current collector all can increase information transmission.Therefore, by above to traction generator, particularly the operating state of contact line and pantagraph current collector can be found out, contact line physical layer has other feature beyond general medium voltage power line physical layer noise, particularly cause physical layer transmission off and on by the reason such as off and on of phase-separating section, section point and pantagraph current collector and contact line, add the impulse disturbances, the interference of electromagnetic field etc. that are produced by electric arc, in general, its feature class of contact line is similar to the communication channel with very noisy height probability of erasure.But again due to most important device structure that contact line is electric railway and city rail trailer system, and contact line is outdoor layout, and the load on circuit moves along contact wire along with electric locomotive and constantly changes, running environment has immeasurability, therefore to the structure of contact line and security requirement very high, basic demand is as follows:
(1) contact net equipment structure is tried one's best simple rigid, constructability, operation and maintenance.In the event of an accident, be convenient to repairing and restore electricity rapidly.
(2) in locomotive high-speed cruising process, under adverse weather condition, all to ensure that electric locomotive normally gets stream, require that contact line has stability and enough elasticity in mechanical structure.
(3) contact net equipment and part will have interchangeability, should have enough resistance to wears and resistance to corrosion and the service time of extension device of will trying one's best.
The distribution of contact line is wide, high stability and high strength are its maximum advantages, if general communication physical layer is because of when the reason such as weather or landform breaks down or time malfunctioning, contact line be one can trustworthy information channel.Its physical layer model is by can simplified summary be the very noisy deletion of physically layer being added the arc noise produced by pantagraph current collector and contact line loose contact by five kinds of noises of general medium voltage power line physical layer above.
2) medium-voltage power line communication: common mesolow power line physical layer carries out Signal transmissions, its physical layer state generally has that line impedance is little, signal attenuation is strong, time become the features such as multi-path jamming is large.Its noise roughly can be divided into five classes, that is, colored background noise, narrow-band noise, periodic noise asynchronous with power frequency, sudden noise, with power frequency property synchronizing cycle noise.For common medium-voltage power line communication, its means relative maturity.Conventional solution as adopted forward error correction (FEC---ForwardErrorCorrection), receiving terminal arranges filter, automatic repeat request (ARQ---AutomaticRepeat-reQuest) etc.And for the multidiameter delay problem of power line physical layer, current optimum solution is exactly OFDM (OrthogonalFrequencyDivisionMultiplexing) technology.OFDM technology is the key technology realizing power telecom network high speed data transfer.
3) proposition the earliest of fountain codes decoding theory is the validity and reliability problem in order to solve information transmission in Internet network physical layer, and Internet network physical layer is a true typical binary deletion of physically layer.The basic thought of its concept is: former data file is grouped into the packet of some by application layer transmitting terminal, these packets are encoded and exports a coded data packet stream, as long as the encoded packets that receiving terminal correctly receives sufficient amount in this data packet stream can recover all former data files by decoder, and what need not consider to receive is the reception order of which packet in coded data packet stream and these packets, the extensive automatic request for repetition caused by high probability of erasure so just can be avoided.From this feature contact line power line interrupted, its feature class is similar to the communication channel with very noisy height probability of erasure.Fountain codes decoding technique is the transmission of the power line information be applicable under interrupted condition.
As can be seen here, realization contact line is carried out to the transmission of signal, traditional medium-voltage power line communication means can only solve general noise, for the large impulsive noise that the electric arc off and on and between pantagraph current collector and contact line of contact line Signal transmissions produces, the way that proposition one is not optimum.
Summary of the invention
The object of the invention is to realize the method that contact line (rail) carries out signal communication, particularly for the Technical Solving that this special medium voltage electricity line structure of contact line (rail) proposes.
In order to reach above object, the invention discloses a kind of transmitting terminal of contact line power line communication, comprising with lower module:
An application layer encoder, receives source information, and provides encoded data stream, and application layer encoder packet is containing CRC coding and the cascade of fountain codes coding; And
A physical layer encoder, receives application layer encoder data stream, has forward error correction coding function; And
A physical layer modulator, i.e. OFDM modulation device, receive physical layer encoder data flow, and produce output signal by OFDM modulation mode.
Further, preferred as one, described physical layer encoder adopts CRC check and the cascade of FEC code or LDPC code or CRC code and LDPC code cascade.
Further, preferred as one, described FEC code adopts Turbo code.
The invention also discloses a kind of receiving terminal of contact line power line communication, comprise with lower module:
Physical layer demodulator, i.e. an ofdm demodulator, receive the modulation signal that contact line physical layer transmission is come, and output signal after producing demodulation by OFDM demodulation mode; And
A physical layer decoder, receives the data flow after physical layer demodulator demodulation, and decoding has the modulation signal of forward error correction function, deletes, the failed packet of decoding by remaining correct data packet delivery to application layer decoder; And
An application layer decoder, receives the data flow that physical layer decoder exports, carries out fountain codes decoding, CRC check.
Described physical layer decoder adopts CRC check and the cascade of FEC code or LDPC code or CRC code and LDPC cascade.
The invention also discloses a kind of contact line electric line communication system, comprise with lower part, a contact line power line communication transmitting terminal; And
Contact line channel; And
A contact line power line communication receiving terminal.
The invention also discloses a kind of sending method of contact line power line communication, comprise the following steps: application layer coding step, first source information is carried out merogenesis, CRC check is added to packet after each merogenesis, each is added to the packet of verification, in units of bag, carry out fountain codes coding, transfer to physical layer;
Physical layer encodes step, receives the data flow that application layer coding produces, and adopts the coding method with forward error correction function to encode;
Physical layer modulation step, namely modulates by OFDM method, receives the data flow that physical layer encodes produces, and produces output signal by OFDM modulation mode.
The invention also discloses a kind of method of reseptance of contact line power line communication, comprise the following steps:
Physical layer modulation step, namely adopts OFDM to carry out demodulation, receives the modulation signal that contact line physical layer transmission is come, and output signal after producing demodulation by OFDM demodulation mode;
Physical layer decoding step, receive the data flow after physical layer modulation, the coding/decoding method with forward error correction function is adopted to decode, the failed packet of decoding is deleted, in the packet deleted and comprise due to the large impulsive noise of electric arc cause cannot the packet of decoding, data packet delivery that will be remaining correct is to application layer decoder;
Application layer decoding step, the data flow that decoding fountain codes device exports after constantly receiving physics layer decoder, constantly carries out fountain codes decoding, the number-of-packet transmitted when physical layer slightly larger than the quantity of former merogenesis packet, fountain codes announce successfully decoded after; This information packet is carried out CRC check, judges whether source information transmits successfully, takes this as the standard, feedback transmitting terminal is to determine transmit next information or retransmit this information.
Compared to the prior art the present invention has following beneficial effect: the present invention is by the combination of fountain codes cross-layer technology and physical layer channel code, OFDM modulation technology, solve five kinds of noise problems of general power line communication, particularly fountain codes cross layer design solves the break-make of contact line channel and the pantagraph current collector interference problem by contact line electric spark impulsive noise, further increase the reliability of Signal transmissions and improve the efficiency of system transfers information, and consider the feature that contact line itself is firm, widely distributed, the method is reliably economical.
Accompanying drawing explanation
When considered in conjunction with the accompanying drawings, by referring to detailed description below, more completely can understand the present invention better and easily learn wherein many adjoint advantages, but accompanying drawing described herein is used to provide a further understanding of the present invention, form a part of the present invention, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention, wherein:
Fig. 1 is electric railway traction generator schematic diagram;
Fig. 2 is based on the signal transmission system embodiment block diagram of contact line;
Fig. 3 transmitting terminal coding structure schematic diagram;
Fig. 4 application layer, physical layer encodes mode schematic diagram;
The Packet Error Ratio bit error rate emulation schematic diagram of Fig. 5 non-load application layer fountain codes decoding;
Signal to noise ratio after the decoding of Fig. 6 load application layer fountain codes and Packet Error Ratio emulate schematic diagram.
In figure, 1 high voltage transmission line, 2 traction substations, 3 feed lines, 4 return wires, 5 contact lines, 6 electric locomotives, 7 isolating switches, 8 rail.
Embodiment
Referring to figs. 1 through Fig. 6, embodiments of the invention are described.
For enabling above-mentioned purpose, feature and advantage become apparent more, and below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
As shown in Figure 1, pressure power transmission line 1, traction substation 2, feed line 3, return wire 4, contact line 5, electric locomotive 6, isolating switch 7, rail 8 forms electric railway traction generator.
As shown in Figure 2, a kind of transmitting terminal of contact line power line communication, comprises with lower module: an application layer encoder, receives source information 21, and provides encoded data stream, and application layer encoder packet to be encoded 24 cascades containing CRC coding 23 and fountain codes; And
A physical layer encoder, receives application layer encoder data stream, has forward error correction coding function; And
A physical layer modulator, i.e. OFDM modulation device 27, receive physical layer encoder data flow, and produce output signal by OFDM modulation mode.
A receiving terminal for contact line power line communication, comprises with lower module:
A physical layer demodulator, i.e. ofdm demodulator 29, receive the modulation signal that contact line physical layer transmission is come, and output signal after producing demodulation by OFDM demodulation mode; And
A physical layer decoder, receives the data flow after physical layer demodulator demodulation, and decoding has the modulation signal of forward error correction function, deletes, the failed packet of decoding by remaining correct data packet delivery to application layer decoder; And
An application layer decoder, receives the data flow that physical layer decoder exports, carries out fountain codes decoding 33, CRC check 34.
A kind of contact line electric line communication system, comprises with lower part,
The transmitting terminal of a contact line power line communication; And
Contact line channel; And
The receiving terminal of a contact line power line communication.
A sending method for contact line power line communication, comprises the following steps: application layer coding step, first source information is carried out merogenesis, CRC check is added to packet after each merogenesis, each is added to the packet of verification, in units of wrapping, carry out fountain codes coding, transfer to physical layer;
Physical layer encodes step, receives the data flow that application layer coding produces, and adopts the coding method with forward error correction function to encode;
Physical layer modulation step, namely modulates by OFDM method, receives the data flow that physical layer encodes produces, and produces output signal by OFDM modulation mode.
A method of reseptance for contact line power line communication, comprises the following steps: physical layer modulation step, namely adopts OFDM to carry out demodulation, receives the modulation signal that contact line physical layer transmission is come, and output signal after producing demodulation by OFDM demodulation mode;
Physical layer decoding step, receive the data flow after physical layer modulation, the coding/decoding method with forward error correction function is adopted to decode, the failed packet of decoding is deleted, in the packet deleted and comprise due to the large impulsive noise of electric arc cause cannot the packet of decoding, data packet delivery that will be remaining correct is to application layer decoder;
Application layer decoding step, the data flow that decoding fountain codes device exports after constantly receiving physics layer decoder, constantly carries out fountain codes decoding, the number-of-packet transmitted when physical layer slightly larger than the quantity of former merogenesis packet, fountain codes announce successfully decoded after; This information packet is carried out CRC check, judges whether source information transmits successfully, takes this as the standard, feedback transmitting terminal is to determine transmit next information or retransmit this information.
Adopt OFDM technology on a physical layer, become during to overcome medium voltage power line channel, feature that multipath noise is large, for the hard pulse interference that channel characteristic off and on and electric arc produce, fountain codes coding can be used for the application layer of communication system, be an erasure channel for visible physical layer two ends fountain codes and channel entirety like this.And physical layer adopts suitable forward error correction LDPC code that the decode error information of physical layer receiving terminal (comprise and damaged by electric arc impulse disturbances and the packet that cannot recover) and the grouping information of losing due to channel interruption are together considered as deletion information, such design it is advantageous that how the state of no matter channel and noise are, physical layer and this entirety of channel are for fountain codes being a transparent erasure channel, avoid the extensive automatic request for repetition that high probability of erasure causes simultaneously, improve the efficiency of information transmission.
Wherein physical layer channel code method has following three kinds can select:
1) CRC check+FEC, as CRC check+Turbo code.
2) LDPC code.
3) CRC check+LDPC code.
For these three kinds of coding methods, the first and the second coded system effect are more or less the same, and have forward direction error-detection error-correction function due to LDPC code itself, therefore simple compared with the first structure.It is more reliable that the third coding method adds again CRC check on the second coding method basis.
Embodiment 1
Fig. 2 is the signal transmission system block diagram that the present invention is based on contact line.In transmitting terminal application layer picture frame, source information 21 first through merogenesis to packet 22, then realize CRC coding 23 and fountain codes is encoded 24 functions, then obtain coded data bag 25.Because fountain codes is that the coded message sent by constantly accepting transmitting terminal carries out decoding in decoding 33 process, itself not there is the function that whether successfully decoded inspection is, whether decoding is effectively complete to need CRC check 34 packet, thus stop this decode procedure and announce that this packet is successfully decoded, therefore need first to have carried out CRC coding 23 to each packet in application layer, after carrying out CRC coding 23, carry out fountain codes coding 24.What realize in physical layer picture frame is chnnel coding and the OFDM modulation 27 of physical layer, specifically comprise: serioparallel exchange 271, IFFT272, parallel-serial conversion 273 and D/A274, the chnnel coding of physical layer is the deletion 32 in order to carry out error message between receiving terminal physical layer and Applied layer interface, the decoding by receiving terminal with the physical layer channel code of verifying function carries out entirety deletion to the packet comprising error message, to ensure that the packet transferring to application layer is all correct, the effect of OFDM modulation 27 is the features in order to resist multipath Time-varying fading in power line channel, outputted in a parallel fashion on N bar circuit by deserializer by subscriber signal is inputted in a serial fashion.Message transmission rate on any one on this N bar circuit is the 1/N of former speed, thus effectively reduces the intersymbol interference because time delay causes.The physical layer application layer block diagram function of its receiving terminal and receiving terminal are inverse process.
Its concrete steps are described below for the second coding method LDPC code 26:
1) information 21 to be sent is carried out being grouped into several packets 22, in application layer, each bag is added CRC check 23, in units of packet, then carry out Raptor fountain codes coding 24, generate coded data packet continually and be passed to physical layer.
2) after physical layer carries out LDPC coding 26, OFDM modulation 27 is carried out to resist multidiameter delay decline, after contact line channel 28 transmits, some packets lost with the articulated structure of contact line off and on because of bow net contact, some packets are because various noise jamming comprises mistake, LDPC code decoding 30 is carried out again after OFDM demodulation 29, OFDM demodulation 29 specifically comprises: A/D294, serioparallel exchange 293, FFT2792 and parallel-serial conversion 291, rely on LDPC decoding error detection function to detect the failed packet of decoding simultaneously and carry out deletion 32, by remaining correct data packet delivery to application layer 31
3) carry out the decoding 33 of fountain codes in application layer, this process until information to be sent is through the correct decoding success of CRC check 34, and then carries out the transmission of next information, and this is a complete message transmitting procedure.
Embodiment 2
As in Figure 2-4, system transfers one frame data, comprise N number of packet in these frame data, and the length of each packet is k.Choose Raptor code as application layer coding method.
1) first N number of packet adds CRC check 23 in application layer, and now each data packet length becomes l from k.Then adopt code check to be that the LDPC code of t and the Raptor code of LT code cascade carry out coding 24, the LDPC coding wherein in Raptor code carries out between packet, and packet becomes R=N/t packet from N number of.In units of packet, K packet is carried out LT coding again, n is set to, in general 0<n≤0.05 to the decoding overheads overhead of LT coding.Packet after being encoded by Raptor generates continually and is sent to physical layer, and the transmission upper limit is that Z '=R × (1+n) is individual.
2) physical layer encodes adopts code check to be that the LDPC code 26 of m is encoded to each packet, and the code length of packet increases to l '=l/m position by l, and then carries out modulation 27 by OFDM.The information coding modulation of whole transmitting terminal terminates.
3) after contact line channel 28, will lose a part of packet p, the remaining data packets comprising mistake or do not comprise mistake through OFDM demodulation 29, carries out LDPC code decoding 30 to physical layer.LDPC code decoding 30 is q through verifying error correction, deleting the data packet number of 32 mistakes, and now remaining correct data bag total amount is T=Z '-p-q, is sent to application layer 31.
4) after correct packet is passed to application layer endlessly, decoding 33 and the CRC check 34 of carrying out Raptor code is started.Now, when the number-of-packet received is slightly larger than N, decoding 33 speed of fountain codes starts to enter avalanche region, and decode procedure is until successfully decoded or T all packets is all sent to application layer and decoding is unsuccessful.
5) according to the 4th) in last decode results determine to carry out the transmission of next frame data or retransmit.
Adopt contact line (rail) communication means of the third coded system CRC check+LDPC code and said method difference little.When in actual applications, not reaching the index of engine request according to the second coding method, can adopt the third coded system, is ISN by LDPC, and CRC check is that outer code is encoded, and improves the reliability of the method information transmission further.
When Fig. 5, Fig. 6 are respectively non-load application layer fountain codes and load application layer fountain codes time Performance comparision.Wherein, system transfers one frame data, comprise 1900 packets in these frame data, contained information bit 504 in each packet, and overhead is n=0.3, and channel adopts desirable mixing to delete additive Gaussian channel model.The packet of these frame data after Raptor coding generates new packet continually by initial 1900 and transfers to physical layer, and sending the upper limit is 2470.
This advantage of inventing obviously can be found out by emulation.When not using fountain codes cross layer design, due to the severe of contact line interchannel noise and feature off and on, transmit frame data always to have a large amount of packets and comprise error bit, and in most of the cases, even if signal to noise ratio is increased, Packet Error Ratio can enter into incorrect platform district and cannot reduce to 0(sees Fig. 5), therefore, be failed for decoding whole frame data.After introducing fountain codes cross-layer technology, for the packet finally passing to application layer, do not require that at the Packet Error Ratio of physical layer receiving terminal be 0, as long as now there is the packet of some to be correct, and during the quantity of correct quantity slightly larger than former fountain codes coded data packet just can by all packets successfully decoded (in figure 6, dotted line represents that this emulation is successfully decoded under this technical method of employing).Therefore the information transmitting of contact line can be realized by this technical method.
As mentioned above, embodiments of the invention are explained, but as long as do not depart from inventive point of the present invention in fact and effect can have a lot of distortion, this will be readily apparent to persons skilled in the art.Therefore, such variation is also all included within protection scope of the present invention.
Claims (9)
1. a transmitting terminal for contact line power line communication, is characterized in that, comprises with lower module:
An application layer encoder, for receiving source information, application layer encoder packet is containing CRC coding and the cascade of fountain codes coding, source information first through merogenesis to packet, realize CRC coding and fountain codes encoding function again, then obtain coded data bag, as encoded data stream; And
A physical layer encoder, has forward error correction coding function, adopts CRC check and the cascade of FEC code, receives application layer encoder data stream; And
A physical layer modulator, i.e. OFDM modulation device, receive physical layer encoder data flow, and produce output signal by OFDM modulation mode.
2. the transmitting terminal of a kind of contact line power line communication according to claim 1, is characterized in that, described FEC code adopts Turbo code.
3. the transmitting terminal of a kind of contact line power line communication according to claim 1, is characterized in that, described physical layer encoder adopts LDPC code or CRC code and LDPC code cascade.
4. a receiving terminal for contact line power line communication, is characterized in that, comprises with lower module:
Physical layer demodulator, i.e. an ofdm demodulator, receive the modulation signal that contact line physical layer transmission is come, and output signal after producing demodulation by OFDM demodulation mode; And
A physical layer decoder, receives the data flow after physical layer demodulator demodulation, adopts the coding/decoding method with forward error correction function to decode, and deletes, the failed packet of decoding by remaining correct data packet delivery to application layer decoder; And
An application layer decoder, receives the data flow that physical layer decoder exports, carries out fountain codes decoding, CRC check.
5. the receiving terminal of a kind of contact line power line communication according to claim 4, is characterized in that, described physical layer decoder adopts CRC check and the cascade of FEC code or LDPC code or CRC code and LDPC cascade.
6. the receiving terminal of a kind of contact line power line communication according to claim 5, is characterized in that, described FEC code adopts Turbo code.
7. a contact line electric line communication system, is characterized in that, comprises with lower part,
As the transmitting terminal of one of Claims 1-4; And
Contact line channel; And
As the receiving terminal of one of claim 5 to 6.
8. a sending method for contact line power line communication, is characterized in that, comprises the following steps:
Application layer coding step, first carries out merogenesis by source information, adds CRC check, each is added to the packet of verification, carry out fountain codes coding, transfer to physical layer in units of wrapping packet after each merogenesis;
Physical layer encodes step, receives the data flow that application layer coding produces, and adopts the coding method with forward error correction coding function to encode;
Physical layer modulation step, namely modulates by OFDM method, receives the data flow that physical layer encodes produces, and produces output signal by OFDM modulation mode.
9. a method of reseptance for contact line power line communication, is characterized in that, comprises the following steps:
Physical layer modulation step, namely adopts OFDM to carry out demodulation, receives the modulation signal that contact line physical layer transmission is come, and output signal after producing demodulation by OFDM demodulation mode;
Physical layer decoding step, receives the data flow after physical layer modulation, adopts the coding/decoding method with forward error correction function to decode, and is deleted by the failed packet of decoding, correct packet is passed to application layer decoder continually simultaneously;
Application layer decoding step, the data flow that decoding fountain codes device exports after constantly receiving physics layer decoder, constantly carries out fountain codes decoding, the number-of-packet transmitted when physical layer slightly larger than the quantity of former merogenesis packet, fountain codes announce successfully decoded after; This information packet is carried out CRC check, judges whether source information transmits successfully, takes this as the standard, feedback transmitting terminal is to determine transmit next information or retransmit this information.
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| CN103391163B (en) * | 2013-07-15 | 2016-08-24 | 北京交大微联科技有限公司 | A kind of CBTC data using distributed fountain codes send and method of reseptance and system |
| EP3242406B1 (en) * | 2015-01-27 | 2020-01-15 | Huawei Technologies Co., Ltd. | Fec decoding apparatus and method |
| CN110089036B (en) | 2016-12-27 | 2021-02-23 | 华为技术有限公司 | Data transmission method, sending equipment and receiving equipment |
| CN106992801A (en) * | 2017-04-01 | 2017-07-28 | 师嘉麟 | A kind of method for solving the device data transmission problem that contact is powered on movable body |
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| CN101252606A (en) * | 2008-03-21 | 2008-08-27 | 哈尔滨工业大学深圳研究生院 | Method for translating and editing fountain code based on low density parity check code in deep space communication |
| CN102164026A (en) * | 2011-05-20 | 2011-08-24 | 哈尔滨工业大学深圳研究生院 | Fountain code compiling method based on deep space communication environment |
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