CN107786962B - Wireless communication device and wireless communication group - Google Patents
Wireless communication device and wireless communication group Download PDFInfo
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- CN107786962B CN107786962B CN201710984020.0A CN201710984020A CN107786962B CN 107786962 B CN107786962 B CN 107786962B CN 201710984020 A CN201710984020 A CN 201710984020A CN 107786962 B CN107786962 B CN 107786962B
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Abstract
The embodiment of the invention relates to a wireless communication device, which comprises: photoelectric converter, frequency generator, modulator, power amplifier and antenna; the photoelectric converter receives the split optical signal sent by the optical splitter, converts the split optical signal into a first electric signal and sends the first electric signal to the modulator; the frequency generator generates a frequency signal and sends the frequency signal to the modulator; the modulator modulates the first electric signal into a frequency signal to generate a first driving signal and sends the first driving signal to the power amplifier; the power amplifier amplifies the first driving signal to generate an amplified first driving signal; the antenna sends a first pulse signal according to the amplified first driving signal, and the first pulse signal is used for being received by the wireless signal receiving and sending device. The invention combines the millimeter wave communication technology and the optical communication technology and uses a special communication protocol to realize the high-capacity and high-reliability data communication of the train and the ground under the condition of high-speed movement.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a wireless communication device and a wireless communication group.
Background
To date, all mobile communication systems have been established to address personal communications, and therefore, from the first generation mobile communication systems to the present 5G mobile communication systems, all mobile communication technology developments have been to improve the quality of personal communications. Therefore, it is not practical to attempt to solve the train-ground communication of a high-speed train in a wide area condition based on the existing technology or the existing infrastructure of mobile communication. In fact, the GSM-R evolved in the GSM technology at present is not able to adapt to the information and intelligent vehicle-ground communication demand of high-speed railway traffic, which is more and more urgent, and the effective progress of the technology and the technical progress of the high-speed railway vehicle-ground communication system are not seen.
Since the wireless communication is affected by the doppler effect firstly under the condition of high-speed movement, and the frequency shift phenomenon is also intensified synchronously along with the increase of the movement speed of the wireless frequency, frequency desynchronization is caused, and very obvious signal desynchronization is caused for the broadband wireless communication under the high-density signal modulation, and a wireless receiver cannot analyze the communication signal sent by the transmitter.
Under the condition of high-speed movement, multipath fading of wireless communication, particularly wireless broadband communication, is amplified sharply, direct communication paths are damaged due to the high-speed movement, and instead, a plurality of unpredictable communication paths are replaced, and the phenomena are main reasons directly causing the remarkable increase of the multipath fading under the high-speed movement. This phenomenon is particularly prominent in high-power long-distance wireless communication modes.
For the purpose of wireless communication under high speed conditions, especially wireless broadband communication, it is common practice to build base stations along high-speed railway lines at great distances and increase communication and power, and this practice just reduces the reliability of wireless communication. The remote wireless communication not only reduces the quality of wireless communication due to the bad weather phenomena such as rain, snow, fog and the like caused by climate change, but also even interrupts the communication, so that the wireless communication loses the position of an important support means for high-speed rail informatization and intellectualization, and the failure of high-speed rail informatization and intellectualization can be directly caused.
Also, although the wireless optical communication is not affected by the doppler effect, the requirement for meteorological conditions is too high and the high complexity of the system is that the possibility of applying the technology to high-speed rail communication cannot be seen at present, and besides the limitation of the communication bandwidth, the satellite communication is also the main reason for limiting the application of the satellite communication to the high-speed rail vehicle-ground communication due to the fact that the satellite signal is too weak and too many railway tunnels in high-latitude areas.
Disclosure of Invention
The invention aims to provide a wireless communication device and a wireless communication group aiming at the defects of the prior art, provides a brand new wireless communication mode, applies a millimeter wave communication technology to the communication with a vehicle and a ground so as to solve the communication bandwidth, uses a short-distance micropower wireless communication technology to replace long-distance high-power communication so as to solve the reliability problem of the wireless communication, uses a direct modulation mode of the wireless optical communication to replace a high-density signal modulation technology commonly used by the current wireless broadband communication, and achieves the signal synchronization and the frequency synchronization under the condition of high-speed movement; therefore, the invention combines the millimeter wave communication technology and the optical communication technology and uses a special communication protocol to realize the large-capacity and high-reliability data communication of the train and the ground under the condition of high-speed movement.
To achieve the above object, in a first aspect, the present invention provides a wireless communication apparatus including an optical-to-electrical converter, a frequency generator, a modulator, a power amplifier, and an antenna;
the photoelectric converter receives a split optical signal sent by the optical splitter, converts the split optical signal into a first electric signal and sends the first electric signal to the modulator;
the frequency generator generates a frequency signal and sends the frequency signal to the modulator;
the modulator modulates the first electric signal into the frequency signal to generate a first driving signal, and sends the first driving signal to the power amplifier;
the power amplifier amplifies the first driving signal to generate an amplified first driving signal;
and the antenna sends a first pulse signal according to the amplified first driving signal for receiving by the wireless signal receiving and sending device.
Preferably, the antenna is further configured to receive a communication signal sent by the wireless signal transceiver;
the modulator is further used for demodulating the communication signal to generate a second electric signal;
the photoelectric converter generates the second electrical signal into a communication optical signal.
Preferably, the antenna is a radio frequency antenna, and the radio frequency antenna is specifically configured to generate the micro-power first pulse signal from the amplified first driving signal and send the micro-power first pulse signal.
Further preferably, the micro-power first pulse signal is a radio frequency signal.
Preferably, the modulation mode of the modulator is on-off keying or digital pulse interval modulation.
In a second aspect, an embodiment of the present invention provides a wireless communication group, where the wireless communication group includes: the optical communication system comprises an optical splitter and a plurality of wireless communication nodes;
the optical splitter is used for splitting the signal optical signal to obtain a split optical signal;
the wireless communication node comprises: photoelectric converter, frequency generator, modulator, power amplifier and antenna;
the photoelectric converter is used for receiving the branched optical signal sent by the optical branching device, converting the branched optical signal into a first electric signal and sending the first electric signal to the modulator;
the frequency generator generates a frequency signal and sends the frequency signal to the modulator;
the modulator receives and modulates the first electric signal into the frequency signal, generates a first synchronous driving signal and sends the first synchronous driving signal to the power amplifier;
the power amplifier amplifies the first synchronous driving signal to generate an amplified first synchronous driving signal;
and the antenna sends a pulse signal according to the amplified first synchronous driving signal, so that each wireless communication node of the wireless communication group simultaneously and synchronously sends the same pulse signal for the wireless signal transceiving nodes in the external wireless signal transceiving chain to sequentially receive.
Preferably, the wireless communication group column further includes a first group column optical fiber connected to the optical splitter and configured to transmit the signal optical signal to the optical splitter.
Preferably, the wireless communication group column further includes a signal processor respectively connected to the plurality of wireless communication nodes;
each antenna of the plurality of wireless communication nodes is further configured to receive a plurality of communication signals transmitted by a wireless signal transceiving node in the wireless signal transceiving chain;
the modulator is further used for demodulating the communication signal received by the corresponding antenna to generate a second electric signal;
the photoelectric converter generates a communication optical signal from the second electric signal generated by the corresponding modulator;
the signal processor is used for respectively receiving the communication optical signals sent by each wireless communication node and filtering the communication optical signals into received optical signals.
Further preferably, the wireless communication group further includes:
and the second group of column optical fibers are connected with the signal processor and used for transmitting the received optical signals sent by the signal processor.
Further preferably, the wireless communication group further includes:
and the optical communication machine is connected with the second group of optical fibers and is used for processing the received optical signals sent by the second group of optical fibers.
The embodiment of the invention provides a wireless communication device, which provides a brand new wireless communication mode, applies a millimeter wave communication technology to the communication with a vehicle and a ground so as to solve the communication bandwidth, uses a short-distance micro-power wireless communication technology to replace long-distance high-power communication so as to solve the reliability problem of the wireless communication, uses a direct modulation mode of the wireless optical communication to replace a high-density signal modulation technology commonly used in the wireless broadband communication at present, and achieves the signal synchronization and the frequency synchronization under the condition of high-speed movement; therefore, the millimeter wave communication technology and the optical communication technology are combined, and a special communication protocol is used for realizing large-capacity and high-reliability data communication of the train and the ground under the condition of high-speed movement.
Drawings
Fig. 1 is a schematic structural diagram of a wireless communication device according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a wireless communication device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a wireless communication group according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Fig. 1 is a schematic structural diagram of a wireless communication device according to an embodiment of the present invention, and as shown in fig. 1, the wireless communication device includes a photoelectric converter 11, a frequency generator 12, a modulator 13, a power amplifier 14, and an antenna 15.
The optical-to-electrical converter 11 receives the split optical signal sent by the optical splitter 2, converts the split optical signal into a first electrical signal, and sends the first electrical signal to the modulator 13. The frequency generator 12 generates a frequency signal which is sent to the modulator 13. The modulator 13 modulates the first electrical signal sent by the photoelectric converter 11 into the frequency signal generated by the frequency generator 12, so as to generate a first driving signal, and sends the first driving signal to the power amplifier 14. Preferably, the modulation scheme of the modulator 13 is a pulse modulation scheme, such as on-off keying (OOK) or Digital Pulse Interval Modulation (DPIM). The power amplifier 14 amplifies the first driving signal to generate an amplified first driving signal, which is transmitted to the antenna 15. The antenna 15 transmits a first pulse signal according to the amplified first driving signal for reception by the wireless signal transceiver. In order to realize stable, fast and reliable transmission of signals between the wireless communication device and the wireless signal transceiver, the antenna 15 is preferably a radio frequency antenna 15, and the radio frequency antenna 15 generates and transmits a micro-power first pulse signal according to the amplified first driving signal generated by the power amplifier 14, wherein the micro-power first pulse signal is a radio frequency signal.
The antenna 15 may be used to receive a communication signal transmitted from the wireless signal transmitting/receiving device when the wireless communication device receives the signal. The modulator 13 may also demodulate the communication signal to generate a second electrical signal, which is sent to the photoelectric converter 11. The photoelectric converter 11 generates the second electrical signal into a communication optical signal, thereby converting the electrical signal into an optical signal.
The wireless communication device provided by the invention can realize reliable signal transmission with the wireless signal receiving and transmitting device, and in a specific application, the wireless communication device is arranged at the train end, the wireless signal receiving and transmitting device is arranged on the ground along a parallel axis of a track, and the train-ground communication process is specifically described below.
When the train communicates with the ground, the vehicle-mounted wireless communication device transmits a micropower pulse signal to the ground wireless signal transceiver.
Specifically, fig. 2 is a schematic diagram of a signal transmitted by a wireless communication device according to an embodiment of the present invention, and with reference to fig. 2, an optical-to-electrical converter 11 of the wireless communication device receives a split optical signal transmitted by an optical splitter (not shown in fig. 2), converts the split optical signal into a first electrical signal, and transmits the first electrical signal to a modulator 13, where a waveform of the split optical signal may be a waveform below the optical-to-electrical converter 11 in fig. 2, and a waveform of the first electrical signal formed after the optical-to-electrical conversion may be a waveform above the optical-to-electrical converter 11; specifically, the optical fiber transmits a signal light signal, and the light signal is generated in a train and transmitted to a receiving end (e.g., a wireless signal transceiver) on the ground. The optical splitter is connected with the optical fiber, so that the optical signal transmitted by the optical fiber can be received, and then the optical signal is split into multiple paths of same split optical signals, and each path of split optical signal is transmitted to a corresponding wireless communication device. The wireless communication device may perform subsequent processing on the split optical signal, wherein the optical-to-electrical converter 11 may convert the received split optical signal into a first electrical signal.
The frequency generator 12 generates a frequency signal and sends the frequency signal to the modulator 13; specifically, the frequency generator 12 can generate a frequency signal with a stable waveform for the modulator 13 to carry out carrier wave, and the waveform diagram of the frequency signal generated by the frequency generator 12 can be the waveform diagram shown above the frequency generator 12.
The modulator 13 modulates the first electric signal sent by the photoelectric converter 11 into the frequency signal generated by the frequency generator 12, that is, the electric signal is loaded into the frequency signal with a stable waveform, so as to generate a first driving signal, and send the first driving signal to the power amplifier 14, wherein the waveform diagram of the first driving signal may be the waveform diagram shown at the upper left of the modulator 13; the modulation scheme of the modulator 13 is a pulse modulation scheme, such as OOK or DPIM.
Because the waveform of the first driving signal generated by the modulator 13 is small, the power amplifier 14 is required to amplify the first driving signal, so as to generate an amplified first driving signal, and further obtain a signal with an obvious waveform, the power amplifier 14 sends the amplified first driving signal to the antenna 15, wherein the antenna 15 is preferably a radio frequency antenna 15, specifically, the radio frequency antenna 15 generates a micropower first pulse signal according to the amplified first driving signal generated by the power amplifier 14, and sends the micropower first pulse signal to a ground wireless signal transceiver, where the micropower first pulse signal is a radio frequency signal. Thereby realizing the communication of the train end to the ground.
When the ground communicates with the train, the vehicle-mounted wireless communication device positioned on the train receives the communication signal sent by the ground wireless signal transceiver and generates a communication optical signal.
Specifically, the antenna 15 of the wireless communication device receives a communication signal transmitted by any wireless signal transceiver on the ground; the modulator 13 demodulates the communication signal to generate a second electric signal, and sends the second electric signal to the photoelectric converter 11; the photoelectric converter 11 generates the second electrical signal into a communication optical signal, thereby converting the electrical signal into an optical signal. The in-vehicle wireless communication device transmits the generated communication optical signal to the in-vehicle optical communication device 6 through the optical fiber, and the optical communication device 6 processes the communication optical signal. Therefore, the communication between the ground and the train end is realized.
According to the wireless communication device provided by the embodiment of the invention, in the communication process, the modulation of signals adopts an optical communication modulation mode, an OOK (on-off keying) and a DPIM (differential pulse amplitude modulation) mode so as to obtain good time synchronization of signals between a vehicle and the ground, the signal synchronization and phase analysis of the wireless communication device on the wireless signals in high-speed movement are avoided, and the problem that excessive signals are lost in the signal modulation process caused by a traditional complex modulation method is solved.
Correspondingly, based on the above-mentioned wireless communication apparatus, the present invention further provides a wireless communication group, and fig. 3 is a schematic structural diagram of the wireless communication group provided in the embodiment of the present invention, and as shown in fig. 3, the wireless communication group includes: the optical communication device comprises an optical splitter 2 and a plurality of wireless communication nodes 1, wherein the wireless communication nodes 1 are the wireless communication device.
The optical splitter 2 is configured to perform splitting processing on the signal optical signals to obtain multiple paths of the same split optical signals, and send the multiple paths of the same split optical signals to the wireless communication node 1, respectively.
The optical signal splitter 2 is used for splitting the optical signal and respectively sending the split signal to the wireless communication nodes 1, so that the optical signal is transmitted downwards in a broadcast mode, and the split optical signals received at each wireless communication node 1 are the same.
The plurality of wireless communication nodes 1 are arranged linearly, and as shown in fig. 1 again, the wireless communication nodes 1 specifically include an optical-to-electrical converter 11, a frequency generator 12, a modulator 13, a power amplifier 14, and an antenna 15.
The optical-to-electrical converter 11 is configured to receive the split optical signal sent by the optical splitter 2, convert the split optical signal into a first electrical signal, and send the first electrical signal to the modulator 13. The frequency generator 12 generates a frequency signal and sends the frequency signal to the modulator 13; specifically, the frequency generator 12 can generate a frequency signal of a stable waveform for the modulator 13 to carry out carrier wave. The modulator 13 modulates the first electric signal into a frequency signal, that is, loads the electric signal into a frequency signal with a stable waveform, so as to generate a first synchronous driving signal, and sends the first synchronous driving signal to the power amplifier 14; the modulation scheme of the modulator 13 may specifically be a pulse modulation scheme, such as OOK or DPIM modulation. Since the waveform of the first synchronous driving signal generated by the modulator 13 is small, the power amplifier 14 is required to amplify the first synchronous driving signal, so as to generate an amplified first synchronous driving signal, and further obtain a signal with an obvious waveform, and the power amplifier 14 sends the amplified first synchronous driving signal to the antenna 15.
The antenna 15 transmits a pulse signal according to the amplified first synchronous driving signal, and then transmits the generated pulse signal to a wireless signal transceiving node in an external wireless signal transceiving chain. In order to realize stable, fast and reliable transmission of signals between the wireless communication array and the wireless signal transceiving chain, the antenna 15 is preferably a radio frequency antenna 15, and the radio frequency antenna 15 generates a first pulse signal with micro power according to the amplified first synchronous driving signal generated by the power amplifier 14 to transmit, wherein the first pulse signal with micro power is a radio frequency signal.
In a preferred embodiment, the wireless communication bank further comprises a first bank optical fibre 4 connected to the optical splitter 2 for transmitting the signal optical signal to the optical splitter 2.
Each antenna 15 of the plurality of wireless communication nodes 1 may also be used to receive communication signals transmitted by wireless signal transceiving nodes in a wireless signal transceiving chain.
As shown in fig. 3, the wireless communication array of the present invention further includes a signal processor 3, where the signal processor 3 may be a chip and is respectively connected to the plurality of wireless communication nodes 1; for filtering the same communication optical signal generated by the plurality of wireless communication nodes 1.
Specifically, the modulator 13 is further configured to demodulate the communication signal received by the corresponding antenna 15 to generate a second electrical signal. The optical-to-electrical converter 11 generates a communication optical signal from the second electrical signal generated by the corresponding modulator 13. The signal processor 3 is configured to receive the communication optical signals sent by each wireless communication node 1, and perform filtering processing to obtain received optical signals. The wireless communication group also comprises a second group optical fiber 5 connected with the signal processor 3 and used for transmitting the received optical signal sent by the signal processor 3. The wireless communication array further comprises an optical communicator 6 connected to the second array fiber 5 for processing the received optical signal transmitted by the second array fiber 5.
The wireless communication array provided by the invention can realize reliable signal transmission with a wireless signal transceiving chain, and it needs to be noted that the wireless signal transceiving chain comprises a plurality of wireless signal transceiving nodes, and the wireless signal transceiving nodes are connected through a passive optical network to form a chain type wireless network. The distribution of the wireless communication array and the wireless signal transceiving chains is parallel, and the wireless communication array can be particularly applied to train communication, the wireless communication array is arranged on a carriage along the longitudinal axis direction of a train, the wireless signal transceiving chains are arranged along the direction of a train track, an antenna 15 of each wireless signal transceiving node is perpendicular to a rail and opposite to the antenna 15 of the wireless communication node 1 in direction, and the distance between the wireless signal transceiving nodes ensures that wireless signals transmitted by each other can be completely received by each other, so that a wireless communication relation is formed; the length of the linear wireless communication group column is L, and the distance between each wireless signal transceiving node of the wireless signal transceiving chain is equal to the length L of the linear wireless communication group column. The following describes the communication process between the vehicular wireless communication group and the terrestrial wireless signal transceiving chain.
When a train communicates with the ground, a signal optical signal sent by a train signal processing system end through an optical communicator 6 is transmitted along a first group of column optical fibers 4, the signal optical signal is divided into N paths of same branching optical signals through an optical splitter 2, the N paths of same branching optical signals are respectively transmitted to corresponding wireless communication nodes 1 along the first group of column optical fibers 4, an optical-to-electrical converter 11 of each wireless communication node 1 receives one path of branching optical signal sent by the optical splitter 2, the branching optical signal is converted into a first electrical signal, and the process of converting the specific first electrical signal into a micropower first pulse signal is the same as the process of the wireless signal transceiver, and is not described herein again.
It should be noted that the modulator 13 of each wireless communication node 1 is used to control the corresponding wireless communication node 1 in the wireless communication array to synchronously send out signals, so that the point-like signal transmission of a single wireless communication node 1 can be converted into the linear signal transmission of the wireless communication array. When receiving the signals transmitted by the wireless communication train, the wireless signal transceiving chain does not sense and distinguish which wireless communication node 1 transmits the signals, and during the running of the moving train, one wireless signal transceiving node can sequentially receive the signals transmitted by each wireless communication node 1 from beginning to end in the wireless communication train.
Furthermore, each wireless communication node 1 of the vehicle-mounted wireless communication group synchronously sends out micro-power first pulse signals with the same frequency and basically synchronous in time according to a communication protocol specified by the system under the control of the respective modulator 13, and the synchronous micro-power first pulse signals form a wireless signal transceiving chain pointing to the ground communication system so as to be received by one wireless signal transceiving node in the wireless signal transceiving chain; the wireless signal transceiving node performs protocol conversion on the received signal under the control of the synchronous controller of the wireless signal transceiving chain, converts the received signal into an optical signal by the photoelectric converter 11 of the wireless signal transceiving node, and transmits the optical signal to a ground receiving end through an optical fiber for processing according to an instruction of the receiving end optical communicator 6 of the ground network. It should be noted that the modulator 13 of each wireless communication node 1 may obtain the micro-power first pulse signal substantially synchronized in time by a physical adjustment method, and a phase error between wavelengths of the first pulse signals transmitted by the respective wireless communication nodes 1 is not large, so as to ensure that the respective wireless communication nodes 1 in the wireless communication train synchronously transmit the same first pulse signal.
During the running process of the train, the linear wireless communication array moves along with the train until the wireless signal transceiving node BF (k) is separated from the ground chain type network, however, since the distance between the wireless signal transceiving nodes of the terrestrial network is equal to the length of the linear wireless communication group, therefore, when the linear wireless communication group departs from the wireless signal transceiving node BF (k), another wireless communication group must be accessed to the same wireless signal transceiving node BF (k) at the same time according to the moving direction, and in the wireless signal transceiving node BF (k-1) or the wireless signal transceiving node BF (k +1) which operates synchronously, and the new wireless signal transceiving node receives the wireless communication signal transmitted by the linear wireless communication group, and the optical signals are sequentially converted into optical signals by the photoelectric converters 11 of the wireless signal transceiving nodes in sequence and transmitted to the optical communication machine 6 of the ground communication network for processing. For the convenience of description, the above BF represents the wireless signal transceiving node 24, BF (k) represents the kth wireless signal transceiving node, BF (k-1) represents the kth wireless signal transceiving node, and BF (k +1) represents the kth +1 wireless signal transceiving node.
Therefore, the train-mounted linear wireless communication array moves along a chain type wireless network formed by the ground wireless signal transceiving chains along with the train, each wireless communication node 1 of the linear wireless communication array sequentially passes through the wireless signal transceiving nodes of the ground chain type wireless network, and because each wireless communication node 1 completely works synchronously, when the train passes through, the signals received by the wireless signal transceiving nodes of the ground network are completely the same and cannot be influenced by the moving process of the train.
Meanwhile, although the vehicle-mounted linear wireless communication array also moves at a high speed in the process of high-speed movement of the train, because radio waves transmitted by the linear wireless communication array are basically vertical to wireless signal transceiving nodes of a ground network and a direct modulation mode of optical communication is adopted, the influence of Doppler effect on the communication process is small. Furthermore, as the transmitting direction of the radio wave of the linear wireless communication array is perpendicular to the ground wireless signal transceiving chain, a communication path which has high signal-to-noise ratio and is mainly a direct path exists, the interference of multipath can be avoided by the power adjustment of the wireless communication array and the adoption of a high-quality antenna system, and the communication quality is ensured in the rapid running process of the train.
Further, in this example, taking the communication frequency of 90G millimeter wave as an example, if the signal modulation rate is 5%, a communication rate of about 4.5G can be obtained at 90G carrier frequency, and similarly, the communication rate obtained in the frequency bands of 45G and 60G, which are easily available, is very considerable, and far exceeds the communication rate that can be provided for high-speed trains by the current communication system, so that more communication bandwidths can be obtained by arranging a plurality of frequency points in the millimeter wave frequency band for communication.
When the ground communicates with the train, the optical communication machine 6 of the ground core network sends out signal optical signals, the signal optical signals are transmitted to each wireless signal transceiving node in the wireless signal transceiving chain along optical fibers, the optical signals received by each wireless signal transceiving node are converted into electric signals under the action of a corresponding photoelectric converter, the electric signals are processed into synchronous driving signals under the control of a synchronous controller of the wireless signal transceiving chain, the synchronous driving signals synchronously send out pulse signals with the same frequency and synchronous time according to a communication protocol specified by a system, and the synchronous pulse signals form a wireless communication signal pointing to the wireless communication train of the train-mounted communication and are received by the wireless communication nodes 1 of the wireless communication train. Specifically, the antennas 15 of the plurality of wireless communication nodes 1 receive communication signals transmitted by wireless signal transmitting and receiving nodes in a wireless signal transmitting and receiving chain; the wireless communication node 1 processes the received communication signal to generate a communication optical signal, and sends the communication optical signal to the signal processor 3, and the specific processing procedure is the same as that of the wireless communication device, and is not described herein again; the signal processor 3 receives the communication optical signals sent by each wireless communication node 1, and performs filtering processing to obtain received optical signals, so as to filter out the same communication optical signals sent by a plurality of wireless communication nodes 1, and transmit the received optical signals to the vehicle-mounted optical communication machine 6 through the second group of optical fibers 5 for processing.
When the train moves at a high speed, the wireless communication group moves with the train, and sequentially receives the same communication signals transmitted by the wireless signal transmitting and receiving nodes, thereby forming continuous reception within the coverage area of the chain network.
Therefore, in the communication process between the vehicle-mounted wireless communication array and the ground wireless signal transceiving chain, the modulation of the signals adopts an optical communication modulation mode, OOK, DPIM and other modulation modes so as to obtain good time synchronization of the signals between the vehicle and the ground, and the signal synchronization and phase analysis of the wireless signals by a wireless receiver in high-speed movement are avoided; furthermore, millimeter waves are used for replacing light waves, so that the difficulty of alignment and switching of the optical system under high-speed movement can be avoided.
In addition, during the running of the train, each vehicle-mounted wireless communication node of the vehicle-mounted wireless communication train can receive the signal transmitted by the ground wireless signal transceiving chain while transmitting the signal, and can be implemented by using frequency division multiplexing.
Similarly, each wireless signal receiving node in the ground wireless signal receiving and transmitting chain can receive the signal transmitted by the vehicle-mounted wireless communication array and transmit the signal to the wireless communication array at the same time by using the frequency division multiplexing technology. That is to say, the wireless communication node and the wireless signal receiving node can receive and send signals simultaneously, thereby realizing the continuous communication process in the train moving process.
The wireless communication device and the wireless communication group provided by the embodiment of the invention provide a brand-new wireless communication mode, a millimeter wave communication technology is applied to the communication with a vehicle and a ground to solve the communication bandwidth, a short-distance micro-power wireless communication technology is used for replacing long-distance high-power communication to solve the reliability problem of the wireless communication, a direct modulation mode of the wireless optical communication is used for replacing a high-density signal modulation technology commonly used in the wireless broadband communication at present, and the signal synchronization and the frequency synchronization under the high-speed moving condition are achieved; therefore, the millimeter wave communication technology and the optical communication technology are combined, and a special communication protocol is used for realizing large-capacity and high-reliability data communication of the train and the ground under the condition of high-speed movement.
Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied in hardware, a software module executed by a processor, or a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A wireless communication device is arranged at a train end and comprises a photoelectric converter, a frequency generator, a modulator, a power amplifier and an antenna;
the photoelectric converter receives a split optical signal sent by the optical splitter, converts the split optical signal into a first electric signal and sends the first electric signal to the modulator;
the frequency generator generates a frequency signal and sends the frequency signal to the modulator;
the modulator modulates the first electric signal into the frequency signal to generate a first driving signal, and sends the first driving signal to the power amplifier;
the power amplifier amplifies the first driving signal to generate an amplified first driving signal;
the antenna sends a first pulse signal according to the amplified first driving signal, and the first pulse signal is used for receiving by the wireless signal receiving and sending device;
the antenna is a radio frequency antenna, and the radio frequency antenna is specifically used for generating the amplified first driving signal into a micropower first pulse signal and sending the micropower first pulse signal;
the micro-power first pulse signal is a radio frequency signal;
the modulation mode of the modulator is on-off keying or digital pulse interval modulation;
the antenna of the wireless signal receiving and transmitting node is perpendicular to the rail and opposite to the antenna direction of the wireless communication device arranged on the train.
2. The wireless communication apparatus of claim 1,
the antenna is also used for receiving communication signals sent by the wireless signal receiving and sending device;
the modulator is further used for demodulating the communication signal to generate a second electric signal;
the photoelectric converter generates the second electrical signal into a communication optical signal.
3. A wireless communication group, the wireless communication group comprising: the optical communication system comprises an optical splitter and a plurality of wireless communication nodes; wherein the wireless communication node is the wireless communication device of any one of the preceding claims 1 or 2;
the optical splitter is used for splitting the signal optical signal to obtain a split optical signal;
the wireless communication node comprises: photoelectric converter, frequency generator, modulator, power amplifier and antenna;
the photoelectric converter is used for receiving the branched optical signal sent by the optical branching device, converting the branched optical signal into a first electric signal and sending the first electric signal to the modulator;
the frequency generator generates a frequency signal and sends the frequency signal to the modulator;
the modulator modulates the first electric signal into the frequency signal to generate a first synchronous driving signal and sends the first synchronous driving signal to the power amplifier;
the power amplifier amplifies the first synchronous driving signal to generate an amplified first synchronous driving signal;
the antenna sends a pulse signal according to the amplified first synchronous driving signal, so that each wireless communication node of the wireless communication array synchronously sends the same pulse signal at the same time for the wireless signal transceiving nodes in the external wireless signal transceiving chain to sequentially receive;
the antenna of the wireless signal receiving and transmitting node is perpendicular to the rail and opposite to the antenna direction of the wireless communication device arranged on the train.
4. The wireless communication stack of claim 3, further comprising a first stack optical fiber coupled to the optical splitter for transmitting the signal optical signal to the optical splitter.
5. The wireless communication group column according to claim 3, further comprising a signal processor respectively connected to the plurality of wireless communication nodes;
each antenna of the plurality of wireless communication nodes is further configured to receive a plurality of communication signals transmitted by a wireless signal transceiving node in the wireless signal transceiving chain;
the modulator is further used for demodulating the communication signal received by the corresponding antenna to generate a second electric signal;
the photoelectric converter generates a communication optical signal from the second electric signal generated by the corresponding modulator;
the signal processor is used for respectively receiving the communication optical signals sent by each wireless communication node and filtering the communication optical signals into received optical signals.
6. The wireless communication group column of claim 5, wherein the wireless communication group column further comprises:
and the second group of column optical fibers are connected with the signal processor and used for transmitting the received optical signals sent by the signal processor.
7. The wireless communication group column of claim 6, wherein the wireless communication group column further comprises:
and the optical communication machine is connected with the second group of optical fibers and is used for processing the received optical signals sent by the second group of optical fibers.
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| WO2004111707A2 (en) * | 2003-06-12 | 2004-12-23 | Ubi Systems, Inc. | Converting signals in passive optical networks |
| CN101576639A (en) * | 2009-03-30 | 2009-11-11 | 中国科学院等离子体物理研究所 | Redundancy-synchronization-isolation control method for parallel connection or serial connection of power devices |
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| CN105763257B (en) * | 2016-04-25 | 2018-08-17 | 北京科技大学 | A kind of high ferro communication system |
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| WO2004111707A2 (en) * | 2003-06-12 | 2004-12-23 | Ubi Systems, Inc. | Converting signals in passive optical networks |
| CN101576639A (en) * | 2009-03-30 | 2009-11-11 | 中国科学院等离子体物理研究所 | Redundancy-synchronization-isolation control method for parallel connection or serial connection of power devices |
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