CN107835052B - Wireless communication method - Google Patents
Wireless communication method Download PDFInfo
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- CN107835052B CN107835052B CN201710985435.XA CN201710985435A CN107835052B CN 107835052 B CN107835052 B CN 107835052B CN 201710985435 A CN201710985435 A CN 201710985435A CN 107835052 B CN107835052 B CN 107835052B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/524—Pulse modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/67—Optical arrangements in the receiver
- H04B10/676—Optical arrangements in the receiver for all-optical demodulation of the input optical signal
- H04B10/677—Optical arrangements in the receiver for all-optical demodulation of the input optical signal for differentially modulated signal, e.g. DPSK signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
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Abstract
The embodiment of the invention relates to a wireless communication method, which comprises the following steps: the first group of column optical fibers transmit first signal optical signals; the optical branching device carries out branching processing on the first signal optical signal to obtain multiple paths of same first branching optical signals; the method comprises the steps that a plurality of wireless communication nodes synchronously generate the same first pulse signal, and therefore each wireless communication node of a wireless communication group column synchronously transmits the first pulse signal at the same time; the synchronous controller generates a receiving control instruction and sends the receiving control instruction to the current wireless signal transceiving node through the first signal optical fiber and the first passive optical splitter; the current wireless signal transceiving node receives a first pulse signal simultaneously sent by a plurality of wireless communication nodes in a wireless communication group column and generates a first communication optical signal; and the second passive optical splitter receives the first communication optical signal sent by the corresponding wireless signal transceiving node and sends the first communication optical signal to the second signal optical fiber.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a wireless communication method.
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 method 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 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 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.
In view of the above, embodiments of the present invention provide a wireless communication method for a wireless communication system; wherein the wireless communication system comprises: a wireless communication group column and a wireless signal transceiving chain; the wireless communication group comprises: a first set of column fibers, optical splitters and a plurality of wireless communication nodes; the wireless signal transceiving chain comprises: the optical fiber signal transmission system comprises a synchronous controller, a first signal optical fiber, a plurality of first passive optical splitters, a plurality of wireless signal transceiving nodes, a plurality of second passive optical splitters and a second signal optical fiber; the method comprises the following steps:
the first group of column optical fibers transmit first signal optical signals;
the optical splitter performs splitting processing on the first signal optical signal to obtain multiple paths of same first split optical signals;
the wireless communication nodes generate first pulse signals according to the first shunt optical signals, so that each wireless communication node of the wireless communication group column synchronously transmits the first pulse signals at the same time;
the synchronous controller generates a receiving control instruction, and sends the receiving control instruction to a current wireless signal transceiving node in a plurality of wireless signal transceiving nodes which correspond to the first passive optical splitter and need to receive pulse signals through a first signal optical fiber and the first passive optical splitter;
the current wireless signal transceiving node receives first pulse signals simultaneously sent by a plurality of wireless communication nodes of the wireless communication group and generates first communication optical signals according to the first pulse signals;
and the second passive optical splitter receives the first communication optical signal sent by the corresponding wireless signal transceiving node and sends the first communication optical signal to the second signal optical fiber.
Preferably, after the second passive optical splitter receives the first communication optical signal sent by the corresponding wireless signal transceiving node and sends the first communication optical signal to the second signal optical fiber, the method further includes:
the synchronous controller generates a receiving stop instruction and sends the receiving stop instruction to the current wireless signal receiving and sending node;
and the wireless signal transceiving node stops receiving the first pulse signal.
Further preferably, after the wireless signal transceiving node stops receiving the first pulse signal, the method further comprises:
the synchronous controller generates a continuous receiving instruction and sends the continuous receiving instruction to a continuous wireless signal receiving and sending node of the current wireless signal receiving and sending node;
the continuous wireless signal transceiving node starts to receive first pulse signals simultaneously sent by a plurality of wireless communication nodes and generates first communication optical signals;
and the second passive optical splitter receives a first communication optical signal sent by the corresponding connection wireless signal transceiving node and sends the first communication optical signal to the second signal optical fiber.
Further preferably, the wireless signal transceiving chain further includes a second optical communicator, and after the second passive optical splitter receives the first communication optical signal sent by the corresponding connected wireless signal transceiving node and sends the first communication optical signal to the second signal optical fiber, the method further includes:
and the second optical communication machine processes the first communication optical signal sent by the second signal optical fiber.
Preferably, the wireless communication node includes: the antenna comprises a first photoelectric converter, a first frequency generator, a first modulator, a power amplifier and a first antenna; the step of generating, by the wireless communication node, a first pulse signal according to the first split optical signal is specifically:
the first photoelectric converter receives a first shunt optical signal sent by the optical splitter, converts the first shunt optical signal into a first electric signal and sends the first electric signal to the first modulator;
the first frequency generator generates a frequency signal and sends the frequency signal to the first modulator;
the first modulator modulates the first electric signal into the frequency signal according to the synchronous control 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 first antenna transmits a first pulse signal according to the amplified first synchronous driving signal.
Further preferably, the wireless signal transceiving node comprises a second antenna, a low noise amplifier, a mixer, a second frequency generator, a limiting amplifier, a second modulator, and a second photoelectric converter; the step of the current wireless signal transceiver node receiving a first pulse signal simultaneously sent by a plurality of wireless communication nodes in the wireless communication group, and generating a first communication optical signal according to the first pulse signal specifically includes:
the second antenna receives a first pulse signal simultaneously transmitted by a plurality of wireless communication nodes of the wireless communication group column;
the low-noise amplifier performs low-noise amplification processing on the first pulse signal received by the second antenna to generate a processed pulse signal, and sends the processed pulse signal to the mixer;
the second frequency generator generates a frequency signal and sends the frequency signal to the mixer;
the frequency mixer processes the frequency signal into a frequency mixing electric signal according to the processing pulse signal;
the limiting amplifier carries out limiting amplification processing on the mixing electric signal to generate an amplified electric signal;
the second modulator performs protocol conversion on the amplified electrical signal to generate a first communication electrical signal;
the second photoelectric converter converts the first communication electrical signal into a first communication optical signal.
Further preferably, the method further comprises:
the first signal optical fiber transmits a second signal optical signal;
the plurality of first passive optical splitters respectively process second signal optical signals transmitted by the first signal optical fibers to obtain second branch optical signals;
the second photoelectric converter receives the second branch optical signal transmitted by the corresponding first passive optical splitter, converts the second branch optical signal into a second electric signal, and sends the second electric signal to the second modulator;
the second frequency generator generates a frequency signal and sends the frequency signal to the second modulator;
the second modulator receives a synchronous sending instruction sent by the synchronous controller, modulates the second electric signal into the frequency signal according to the synchronous sending instruction, generates a second synchronous driving signal and sends the second synchronous driving signal to the power amplifier;
the power amplifier amplifies the second synchronous driving signal to generate an amplified second synchronous driving signal;
and the second antenna sends a second pulse signal according to the second synchronous driving signal, so that each wireless signal transceiving node of the wireless signal transceiving chain synchronously sends the same second pulse signal at the same time under the control of the synchronous controller.
Further preferably, the wireless communication group column includes a signal processor respectively connected to the plurality of wireless communication nodes; after the second antenna transmits a second pulse signal according to the second synchronous driving signal, so that each wireless signal transceiving node of a wireless signal transceiving chain simultaneously and synchronously transmits the same second pulse signal under the control of the synchronous controller, the method further comprises:
each first antenna of the plurality of wireless communication nodes receives a second pulse signal transmitted by the wireless signal transceiving node;
the first modulator demodulates the second pulse signal to generate a second communication electric signal;
the first photoelectric converter generates a second communication optical signal corresponding to the second communication electric signal generated by the first demodulator;
and the signal processor receives the second communication optical signal sent by each wireless communication node respectively and performs filtering processing to obtain a received optical signal.
Further preferably, the wireless communication group column further comprises a second group column optical fiber; after the signal processor receives the second communication optical signal sent by each wireless communication node and performs filtering processing to obtain a received optical signal, the method further includes:
and the second group of column optical fibers transmit the received optical signals sent by the signal processor.
Further preferably, the wireless communication group further includes a first optical communication device; after the second set of column fibers transmits the received optical signal sent by the signal processor, the method further comprises:
the first optical communicator processes the received optical signals transmitted by the second set of column optical fibers.
The embodiment of the invention provides a wireless communication method, 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 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.
Drawings
Fig. 1 is a schematic structural diagram of a wireless communication array according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a wireless communication node according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a wireless communication node according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a wireless signal transceiving chain according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a wireless signal transceiving node according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a wireless signal transceiving node receiving a signal according to an embodiment of the present invention;
fig. 7 is a flowchart of a wireless communication method 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.
The wireless communication method provided by the embodiment of the invention is applied to a wireless communication system, and in order to better understand the wireless communication method provided by the embodiment of the invention, the wireless communication system is introduced firstly.
The wireless communication system includes a wireless communication array and a wireless signal transceiving chain. First, a structure of a wireless communication group is introduced, fig. 1 is a schematic structural diagram of a wireless communication group provided in an embodiment of the present invention, and as shown in fig. 1, the wireless communication group specifically includes a first group optical fiber 11, an optical splitter 12, and a plurality of wireless communication nodes 13. During the communication, the wireless communication group may transmit a signal to the wireless signal transmission/reception chain or may receive a signal transmitted by the wireless signal transmission/reception chain.
And a first group of column optical fibers 11 for transmitting the first signal optical signals. The optical splitter 12 is connected to the first group of column optical fibers 11, so that the optical splitter 12 can receive the signal optical signals transmitted by the first group of column optical fibers 11, and the optical splitter 12 splits the first signal optical signals transmitted by the first group of column optical fibers 11 to obtain multiple paths of same split optical signals.
Fig. 2 is a schematic structural diagram of the wireless communication node 13 according to an embodiment of the present invention, and the structure of the wireless communication node 13 is specifically described below, as shown in fig. 2, the wireless communication node 13 specifically includes a first photoelectric converter 131, a first frequency generator 132, a first modulator 133, a first power amplifier 134, and a first antenna 135.
Fig. 3 is a schematic diagram of signals transmitted by the wireless communication node 13 according to an embodiment of the present invention, and as shown in fig. 2 and fig. 3, when the wireless communication node 13 transmits a signal, the first optical-to-electrical converter 131 is configured to receive the split optical signal transmitted by the optical splitter 12, convert the split optical signal into a first electrical signal, thereby complete a conversion process from an optical signal to an electrical signal, and transmit the first electrical signal to the first modulator 133; the waveform of the branched optical signal may be a waveform diagram of the left lower side of the first photoelectric converter 131 in fig. 3, and the waveform diagram of the first electrical signal formed after photoelectric conversion may be a waveform diagram of the left upper side of the first photoelectric converter 131.
The first frequency generator 132 is used for generating a frequency signal and sending the frequency signal to the first modulator 133; specifically, the frequency generator can generate a frequency signal with a stable waveform for the modulator to carry out carrier wave; the waveform diagram of the frequency signal generated by the first frequency generator 132 may be the waveform diagram shown in the upper left of the first frequency generator 132 in fig. 3.
The first modulator 133 modulates the first electrical signal into the frequency signal, that is, loads the first electrical signal into the frequency signal with a stable waveform, generates a first synchronous driving signal, and sends the first synchronous driving signal to the first power amplifier 134, wherein a waveform diagram of the first synchronous driving signal may be a waveform diagram shown in an upper left of the first modulator 133 in fig. 3.
A first power amplifier 134 for amplifying the first synchronous driving signal to generate an amplified first synchronous driving signal; specifically, since the waveform of the first synchronous driving signal generated by the first modulator 133 is small, the first power amplifier 134 is required to amplify the first synchronous driving signal, so as to obtain an amplified first synchronous driving signal with a distinct waveform.
A first antenna 135 for transmitting a first pulse signal according to the amplified first synchronous driving signal; the first antenna 135 is preferably a radio frequency antenna, and specifically, the radio frequency antenna generates a first pulse signal with micropower according to the amplified first synchronous driving signal generated by the first power amplifier 134, where the first pulse signal with micropower may be a radio frequency signal, and sends the first pulse signal to the wireless signal transceiving chain.
Next, a structure of a wireless signal transceiving chain is introduced, fig. 4 is a schematic structural diagram of the wireless signal transceiving chain according to the embodiment of the present invention, and as shown in fig. 4, the wireless signal transceiving chain includes a synchronization controller 23, a first signal fiber 21, a plurality of first passive optical splitters 22, a plurality of wireless signal transceiving nodes 24, a plurality of second passive optical splitters 25, and a second signal fiber 26. The wireless signal transmission/reception chain may transmit or receive a signal to or from the wireless communication group.
And a synchronous controller 23, configured to generate a receiving control instruction, send the receiving control instruction to a current wireless signal transceiving node 24 of the plurality of wireless signal transceiving nodes 24 corresponding to the first passive optical splitter 22 and required to receive the pulse signal through the first signal optical fiber 21 and the first passive optical splitter 22.
Fig. 5 is a schematic structural diagram of the wireless signal transceiving node 24 according to the embodiment of the present invention, and the structure of the wireless signal transceiving node 24 is specifically described below, as shown in fig. 5, the wireless signal transceiving node 24 includes a second antenna 245, a low noise amplifier 246, a mixer 247, a second frequency generator 242, a limiting amplifier 248, a second modulator 243, and a second optical-to-electrical converter 241.
Fig. 6 is a schematic diagram of a wireless signal transceiving node 24 according to an embodiment of the present invention, and referring to fig. 5 and fig. 6, when the wireless signal transceiving node 24 receives a signal, the second antenna 245 is configured to receive a first pulse signal simultaneously transmitted by the first antenna 135 of the plurality of wireless communication nodes 13 in the wireless communication group; the waveform of the first pulse signal received by the second antenna 245 may be a waveform diagram as shown in fig. 6 on the left side of the second antenna 245. A low-noise amplifier 246, configured to perform low-noise amplification processing on the first pulse signal received by the second antenna 245, generate a processed pulse signal, and send the processed pulse signal to the mixer 247; the waveform of the processed pulse signal may be a waveform diagram at the upper right of the low noise amplifier 246 as shown in fig. 6. The second frequency generator 242 is configured to generate a frequency signal, which is sent to the mixer 247, wherein the waveform of the frequency signal may be a waveform diagram at the upper left of the second frequency generator 242 in fig. 6. A mixer 247 for processing the frequency signal into a mixed electric signal according to the processing pulse signal; specifically, the mixer 247 loads the processing pulse signal into a frequency signal having a stable waveform, so as to obtain a mixed signal, and sends the mixed signal to the limiting amplifier 248, wherein the waveform diagram of the obtained mixed signal may be the waveform diagram at the upper right of the mixer 247 in fig. 6. A limiting amplifier 248 for performing limiting amplification processing on the mixed electrical signal to generate an amplified electrical signal; the waveform of the amplified electrical signal may be the waveform of the upper right of the limiting amplifier 248 in fig. 6. A second modulator 243 for performing protocol conversion on the amplified electrical signal to generate a first communication electrical signal; the waveform of the first electrical communication signal may be the waveform at the upper right of the second modulator 243 in fig. 6. The second optical-to-electrical converter 241 is configured to convert the first communication electrical signal into a first communication optical signal, so as to convert the transmitted electrical signal into an optical signal.
The synchronous controller 23 is further configured to generate a reception stop instruction, and send the reception stop instruction to the current wireless signal transceiving node 24, where the wireless signal transceiving node 24 stops receiving the first pulse signal. The synchronous controller 23 is further configured to generate a connection receiving instruction, and send the connection receiving instruction to a connection wireless signal transceiving node 24 of the current wireless signal transceiving node 24; the connected wireless signal transmitting/receiving node 24 starts receiving the first pulse signal simultaneously transmitted by the plurality of wireless communication nodes 13, and generates a first communication optical signal.
And a plurality of second passive optical splitters 25 respectively connected to the wireless signal transceiving nodes 24 to receive the first communication optical signals generated by the corresponding connected wireless signal transceiving nodes 24 and send the first communication optical signals to the second signal optical fibers 26. The wireless signal receive chain further comprises a second optical communication machine 27 connected to the second signal fiber 26 for processing the first communication optical signal transmitted by the second signal fiber 26.
During the process of signaling the wireless communication group by the wireless signal transceiving chain, the synchronization controller 23 is further configured to generate a synchronization transmitting signal to be transmitted to all the wireless signal transceiving nodes 24, and all the wireless signal transceiving nodes 24 synchronously transmit the second pulse signal with the same frequency and synchronized in time according to the communication protocol specified by the system.
Specifically, as shown in fig. 4 again, the first signal optical fiber 21 may also be used to transmit a second signal optical signal, where the first signal optical fiber 21 transmits an optical signal, and the second signal optical signal refers to a signal to be transmitted to the wireless communication group by the wireless signal transceiver chain.
The plurality of first passive optical splitters 22 are respectively connected to the first signal optical fiber 21, process the second signal optical signal transmitted by the first signal optical fiber 21 to obtain multiple paths of same split optical signals, and transmit the split optical signals to the corresponding wireless signal transceiving nodes 24.
As shown in fig. 4 and 5, the second optical-to-electrical converter 241 of each wireless signal transceiving node 24 may be further configured to receive the branch optical signal transmitted by the corresponding first passive optical splitter 22, and convert the branch optical signal into a second electrical signal. The second frequency generator 242 may also be used to generate a frequency signal that is sent to the second modulator 243. The second modulator 243 is further configured to receive a synchronous sending instruction sent by the synchronous controller 23, modulate the second electrical signal into the frequency signal according to the synchronous sending instruction, generate a second synchronous driving signal, and send the second synchronous driving signal to the second power amplifier 244. The second power amplifier 244 may also be configured to amplify the second synchronous drive signal to generate an amplified second synchronous drive signal. The second antenna 245 is further configured to send a second pulse signal according to the amplified second synchronous driving signal, and the second antenna 245 is preferably a radio frequency antenna, specifically, the radio frequency antenna generates a second pulse signal with micro power according to the amplified second synchronous driving signal generated by the second power amplifier 244, and the second pulse signal with micro power may be a radio frequency signal and is sent to the wireless communication apparatus.
The first antenna 135 of the plurality of wireless communication nodes 13 may also be used to receive communication signals transmitted by the wireless signaling node 24 in the wireless signaling chain. As shown in fig. 1 again, the wireless communication group includes a signal processor 14, which is respectively connected to the plurality of wireless communication nodes 13 and is configured to filter the same communication optical signals generated by the plurality of wireless communication nodes 13.
Specifically, as shown in fig. 1 and fig. 2, the first modulator 133 is further configured to demodulate the second pulse signal to generate a second communication signal; the first photoelectric converter 131 is further configured to generate a second communication optical signal corresponding to the second communication electrical signal generated by the first demodulator. The signal processor 14 is configured to receive the second communication optical signal sent by each wireless communication node 13, and perform filtering processing to obtain a received optical signal. The wireless communication array further comprises a second array fiber 15 connected to the signal processor 14 for transmitting the received optical signal transmitted by the signal processor 14. The wireless communication bank also includes a first optical communicator 16 connected to the second bank fiber 15 for processing the received optical signals transmitted by the second bank fiber 15.
The wireless communication method provided by the invention can be particularly applied to train-ground communication, and particularly, the distribution of a wireless communication array and a wireless signal transceiving chain is parallel, the wireless communication array is arranged on a carriage along the longitudinal axis direction of a train, and a plurality of wireless communication nodes 13 form a linear radio coverage area through an antenna or the combination of the antennas; the wireless signal transceiving chain is arranged along the direction of a train track, a plurality of wireless signal transceiving nodes 24 are connected through a passive optical network to form a chain type wireless network, the antenna of each wireless signal transceiving node 24 is perpendicular to the track and opposite to the antenna of the wireless communication node 13, 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 24 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.
Fig. 7 is a flowchart of a wireless communication method according to an embodiment of the present invention, which is shown in fig. 1 to 7, and the communication method includes:
specifically, the first optical signal is transmitted by the first optical fiber 11, and the first optical signal is a signal to be transmitted to the wireless signal transceiving chain by the wireless communication group.
102, an optical splitter performs splitting processing on a first signal optical signal to obtain multiple paths of same first split optical signals;
specifically, the optical splitter 12 performs splitting processing on the first signal optical signal transmitted by the first group of column optical fibers 11 to obtain multiple paths of same split optical signals; and each branched optical signal is sent to one wireless communication node 13, so that the optical signal is transmitted downwards in a broadcast mode, and the branched optical signals received at each wireless communication node 13 are the same.
103, synchronously generating the same first pulse signal by the plurality of wireless communication nodes according to the first shunt optical signal, so that each wireless communication node of the wireless communication group simultaneously and synchronously transmits the first pulse signal;
specifically, the first optical-to-electrical converter 131 of each wireless communication node 13 receives the split optical signal sent by the optical splitter 12, converts the split optical signal into a first electrical signal, thereby completing the conversion process from the optical signal to the electrical signal, and sends the first electrical signal to the first modulator 133. The first frequency generator 132 generates a frequency signal, which is sent to the first modulator 133; specifically, the frequency generator can generate a frequency signal with a stable waveform for the modulator to carry out carrier wave. The first modulator 133 modulates the first electrical signal into a frequency signal according to the synchronization control signal, that is, loads the first electrical signal into a frequency signal with a stable waveform, generates a first synchronization driving signal, and sends the first synchronization driving signal to the first power amplifier 134; the modulation scheme of the modulator is a pulse modulation scheme, such as on-off keying (OOK) or Digital Pulse Interval Modulation (DPIM). The first power amplifier 134 amplifies the first synchronous driving signal to generate an amplified first synchronous driving signal; specifically, since the waveform of the first driving signal generated by the first modulator 133 is small, the first power amplifier 134 is required to amplify the first synchronous driving signal, so as to obtain an amplified first synchronous driving signal with a distinct waveform. The first antenna 135 transmits a first pulse signal according to the amplified first synchronous driving signal; the first antenna 135 is preferably a radio frequency antenna, and specifically, the radio frequency antenna generates a first pulse signal with micropower according to the amplified first synchronous driving signal generated by the first power amplifier 134, where the first pulse signal with micropower may be a radio frequency signal, and sends the first pulse signal to the wireless signal transceiving chain. Thereby, each wireless communication node 13 of the wireless communication group column synchronously transmits the first pulse signal at the same time. It should be noted that the modulator of each wireless communication node 13 may obtain the first pulse signal with micropower and time substantially synchronized by a physical adjustment method, and a phase error between wavelengths of the first pulse signals transmitted by the respective wireless communication nodes 13 is not large, so as to ensure that the respective wireless communication nodes 13 in the wireless communication train synchronously transmit the same first pulse signal.
when the train communicates with the ground, all the wireless communication nodes 13 of the train-mounted linear wireless communication group synchronously send out synchronous pulse signals with the same frequency under the control of the respective first modulators 133, and the synchronous controller 23 of the ground wireless signal transceiving chain generates a receiving control instruction according to the motion track of the train and sends the receiving control instruction to the current wireless signal transceiving node 24 which needs to receive the pulse signals in the plurality of wireless signal transceiving nodes 24.
The control command is transmitted to the current wireless signal transceiving node 24 corresponding to the first passive optical branch 22 through the first signal optical fiber 21 and the first passive optical branch 22 during transmission; the current wireless signaling node 24 refers to the wireless signaling node 24 in a receiving state.
specifically, the antenna of the current wireless signal transceiving node 24 receives the pulse signal simultaneously transmitted by the plurality of wireless communication nodes 13 in the wireless communication group; the low noise amplifier 246 performs low noise amplification processing on the pulse signal received by the antenna to generate a processed pulse signal, and sends the processed pulse signal to the mixer 247; the mixer 247 processes the frequency signal into a communication electric signal according to the processing pulse signal generated by the frequency generator; the limiting amplifier 248 carries out limiting amplification processing on the communication electric signal to generate an amplified electric signal; the modulator is used for carrying out protocol conversion on the amplified electric signal to generate an electric signal; the optical-to-electrical converter converts the electrical signal generated by the modulator into a communication optical signal.
And 106, the second passive optical splitter receives the first communication optical signal sent by the corresponding wireless signal transceiving node and sends the first communication optical signal to the second signal optical fiber.
After the current wireless signaling node 24 finishes receiving the first pulse signal, the method further comprises: the synchronous controller 23 is further configured to generate a reception stop instruction and send the reception stop instruction to the current wireless signal transceiving node 24, and the wireless signal transceiving node 24 stops receiving the first pulse signal.
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 13 of the linear wireless communication array sequentially passes through the wireless signal transceiving node 24 of the ground chain type wireless network, and because each wireless communication node 13 completely works synchronously, when the train passes through, the signals received by the wireless signal transceiving node 24 of the ground network are completely the same and cannot be influenced by the moving process of the train.
In the process of train running, the linear wireless communication array moves along with the train until the linear wireless communication array is separated from the wireless signal transceiving node BF (k) of the ground link network, but because the distance between the wireless signal transceiving nodes 24 of the ground network is equal to the length of the linear wireless communication array, when the linear wireless communication array is separated from the wireless signal transceiving node BF (k), another identical wireless signal transceiving node BF (k-1) or wireless signal transceiving node BF (k +1) which works synchronously is accessed at the same time according to the moving direction, and a new wireless signal transceiving node 24 receives the wireless communication signal sent by the linear wireless communication array. 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, after the current wireless signal transceiving node 24 receives the done signal, the method further comprises: the synchronous controller 23 generates a continuous receiving instruction and sends the continuous receiving instruction to the continuous wireless signal receiving and sending node 24 of the current wireless signal receiving and sending node 24; the connected wireless signal transceiver node 24 starts receiving the first pulse signal simultaneously transmitted by the plurality of wireless communication nodes 13, generates a first communication optical signal, and transmits the first communication optical signal to the corresponding second passive optical splitter 25. And then, the plurality of second passive optical splitters 25 transmit the received first communication optical signal generated by the corresponding connected wireless signal transceiving node 24 to the second signal optical fiber 26, and the second optical fiber transmits the first communication optical signal to the second optical communicator 27 for optical signal processing.
In the process of high-speed movement of the train, the vehicle-mounted linear wireless communication array also moves at high speed, but because the radio waves transmitted by the linear wireless communication array are basically vertical to the wireless signal transmitting and receiving node 24 of the ground network and a direct modulation mode of optical communication is adopted, the Doppler effect has little influence on the communication process. 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.
The above describes a method for communicating with a ground wireless signal transceiving chain by a train-mounted wireless communication group, and the following describes a method for communicating with a train-mounted wireless communication group by a ground wireless signal transceiving chain.
When the ground wireless signal transceiving chain transmits a signal, the synchronization controller 23 generates a synchronization transmission signal to transmit to all the wireless signal transceiving nodes 24, and all the wireless signal transceiving nodes 24 synchronously transmit the second pulse signal with the same frequency and synchronized in time according to the communication protocol specified by the system, so that each wireless signal transceiving node 24 of the wireless signal transceiving chain simultaneously and synchronously transmits the same second pulse signal under the control of the synchronization controller 23.
Specifically, the first signal optical fiber 21 transmits a second signal optical signal, where the first signal optical fiber 21 transmits an optical signal, and the second signal optical signal refers to a signal to be sent by the wireless signal transceiver chain to the wireless communication group. The plurality of first passive optical splitters 22 process the second signal optical signal transmitted by the first signal optical fiber 21 to obtain a plurality of paths of same branch optical signals, and send the branch optical signals to the corresponding wireless signal transceiving nodes 24, so that the signal optical signals are transmitted downwards in a broadcast manner, and therefore the branch optical signals received at each wireless signal transceiving node 24 are the same. The second optical-to-electrical converter 241 of each wireless signal transceiving node 24 receives the branched optical signal transmitted by the corresponding first passive optical splitter 22, converts the branched optical signal into a second electrical signal, thereby completing the conversion process from the optical signal to the electrical signal, and sends the second electrical signal to the second modulator 243. The second frequency generator 242 generates a frequency signal that is sent to the second modulator 243. The second modulator 243 receives the synchronous sending command sent by the synchronous controller 23, modulates the second electrical signal into the frequency signal according to the synchronous sending command, generates a second synchronous driving signal, and sends the second synchronous driving signal to the second power amplifier 244, wherein the modulation mode of the modulator is a pulse modulation mode, such as OOK or DPIM. The second power amplifier 244 amplifies the second synchronous driving signal to generate an amplified second synchronous driving signal; specifically, since the waveform of the second synchronous driving signal generated by the second modulator 243 is small, the second power amplifier 244 is required to amplify the second synchronous driving signal, so as to obtain an amplified second synchronous driving signal with a distinct waveform. The second antenna 245 transmits the second pulse signal according to the second synchronous driving signal, and the second antenna 245 is preferably a radio frequency antenna, and specifically, the radio frequency antenna generates a second pulse signal with micropower according to the amplified second synchronous driving signal generated by the second power amplifier 244, and the second pulse signal with micropower may be a radio frequency signal and is transmitted to the wireless communication device.
When the wireless communication apparatus is receiving a signal, the first antenna 135 of the plurality of wireless communication nodes 13 receives the second pulse signal transmitted by the wireless signal transmitting and receiving node 24 in the wireless signal transmitting and receiving chain. The first modulator 133 demodulates the second pulse signal to generate a second communication electric signal; the first photoelectric converter 131 generates a second communication optical signal corresponding to the second communication electrical signal generated by the first demodulator. The signal processor 14 receives the second communication optical signal sent by each wireless communication node 13, performs filtering processing on the same communication optical signals generated by the plurality of wireless communication nodes 13 to obtain received optical signals, and transmits the received optical signals obtained by the processing to the first optical communication device 16 through the second group of optical fibers 15 for processing of the received optical signals.
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.
In the above communication process, although the transmitter is moving at a high speed with the high-speed movement of the train, since the radio waves emitted by the linear wireless communication group are substantially perpendicular to the wireless signal transmitting and receiving node 24 of the ground network and the direct modulation method of optical communication is adopted, the doppler effect has little influence on the communication process.
In the above-mentioned structure of the communication system, the wireless communication array and the wireless signal transceiving nodes of the terrestrial communication network can be regarded as being on one plane, and the maximum doppler effect occurs when the nodes of the terrestrial network are corresponding to any two wireless communication nodes of the vehicle-mounted line type wireless communication array, so that there is a simplified doppler effect formula:
wherein: Δ f is a frequency offset value caused by the doppler effect;
f is the operating frequency, in this example 90G;
v is the moving speed, in this example 360km/h,0.1 km/s;
c is the speed of light, 300,000 km/s;
theta is an included angle between the moving direction of the vehicle-mounted wireless communication array and the ground wireless signal receiving and transmitting chain;
when the distance between the wireless communication nodes of the vehicle-mounted linear wireless communication array is d, and the vertical distance between the wireless communication array and the wireless signal transceiving node of the ground chain type wireless signal transceiving chain is also d, under the condition that the moving speed is 360km/h, the formula can be written as follows:
substituting c to 300,000km/s and F to 90G yields a frequency offset Δ F of 13416Hz due to the maximum doppler effect.
The frequency offset rate is less than fifteen parts per million, and the normal operation of the wireless transceiver is not influenced when the wireless transceiver works under the condition of direct modulation for the base frequency of 90G.
In summary, in the vehicle-ground communication process, the vehicle-mounted wireless communication group moves continuously along the ground wireless signal transceiving chain, sequentially passes through each wireless signal transceiving node of the ground communication network, and sequentially sends wireless communication signals to the wireless signal transceiving nodes of the ground end, and each wireless signal transceiving node of the ground end communication network sequentially sends the wireless communication signals to the core network of the ground according to the communication rules of the network when receiving the communication signals, and sends the wireless communication signals to the core network of the ground through the optical communication network for processing. Meanwhile, each wireless signal transceiving node of the ground communication network sends a communication signal to the vehicle-mounted wireless communication group column, the communication signal is received when the vehicle-mounted wireless communication group column passes through, and the communication signal is transmitted to the vehicle-mounted core network by the vehicle-mounted optical communication network for data processing, so that the continuous communication process of the train moving at a high speed in a section of area to the ground network is realized.
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 embodiment of the invention provides a wireless communication method, 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 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.
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 (9)
1. A wireless communication method of a wireless communication system, the wireless communication system comprising: a wireless communication group column and a wireless signal transceiving chain; the wireless communication group comprises: a first set of column fibers, optical splitters and a plurality of wireless communication nodes; the wireless signal transceiving chain comprises: the optical fiber signal transmission system comprises a synchronous controller, a first signal optical fiber, a plurality of first passive optical splitters, a plurality of wireless signal transceiving nodes, a plurality of second passive optical splitters and a second signal optical fiber; the wireless communication method includes:
the first group of column optical fibers transmit first signal optical signals;
the optical splitter performs splitting processing on the first signal optical signal to obtain multiple paths of same first split optical signals;
the plurality of wireless communication nodes synchronously generate the same first pulse signal according to the first shunt optical signal, so that each wireless communication node of the wireless communication group column synchronously transmits the first pulse signal at the same time;
the synchronous controller generates a receiving control instruction, and sends the receiving control instruction to a current wireless signal transceiving node in a plurality of wireless signal transceiving nodes which correspond to the first passive optical splitter and need to receive pulse signals through a first signal optical fiber and the first passive optical splitter;
the current wireless signal transceiving node receives first pulse signals simultaneously sent by a plurality of wireless communication nodes of the wireless communication group and generates first communication optical signals according to the first pulse signals;
the second passive optical splitter receives a first communication optical signal sent by a corresponding wireless signal transceiving node and sends the first communication optical signal to the second signal optical fiber;
the wireless communication node comprises: the antenna comprises a first photoelectric converter, a first frequency generator, a first modulator, a power amplifier and a first antenna; the step of generating, by the wireless communication node, a first pulse signal according to the first split optical signal is specifically:
the first photoelectric converter receives a first shunt optical signal sent by the optical splitter, converts the first shunt optical signal into a first electric signal and sends the first electric signal to the first modulator;
the first frequency generator generates a frequency signal and sends the frequency signal to the first modulator;
the first modulator modulates the first electric signal into the frequency signal according to a synchronous control 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 first antenna sends a first pulse signal according to the amplified first synchronous driving signal;
the first antenna is a radio frequency antenna which is specifically used for generating a first pulse signal with micropower by amplifying a first synchronous driving signal;
the antenna of the wireless signal transceiving node is perpendicular to the rail and opposite to the antenna of the wireless communication node arranged on the train in direction.
2. The wireless communication method according to claim 1, wherein after the second passive optical splitter receives the first communication optical signal transmitted by the corresponding wireless signal transceiving node and transmits the first communication optical signal to the second signal optical fiber, the method further comprises:
the synchronous controller generates a receiving stop instruction and sends the receiving stop instruction to the current wireless signal receiving and sending node;
and the wireless signal transceiving node stops receiving the first pulse signal.
3. The wireless communication method according to claim 2, wherein after the wireless signal transceiving node stops receiving the first pulse signal, the method further comprises:
the synchronous controller generates a continuous receiving instruction and sends the continuous receiving instruction to a continuous wireless signal receiving and sending node of the current wireless signal receiving and sending node;
the continuous wireless signal transceiving node starts to receive first pulse signals simultaneously sent by a plurality of wireless communication nodes and generates first communication optical signals;
and the second passive optical splitter receives a first communication optical signal sent by the corresponding connection wireless signal transceiving node and sends the first communication optical signal to the second signal optical fiber.
4. The wireless communication method according to claim 3, wherein the wireless signal transceiving chain further comprises a second optical communicator, and after the second passive optical splitter receives the first communication optical signal transmitted by the corresponding splicing wireless signal transceiving node and transmits the first communication optical signal to the second signal optical fiber, the method further comprises:
and the second optical communication machine processes the first communication optical signal sent by the second signal optical fiber.
5. The wireless communication method according to claim 1, wherein the wireless signal transceiving node comprises a second antenna, a low noise amplifier, a mixer, a second frequency generator, a limiting amplifier, a second modulator, and a second photoelectric converter; the step of the current wireless signal transceiver node receiving a first pulse signal simultaneously sent by a plurality of wireless communication nodes in the wireless communication group, and generating a first communication optical signal according to the first pulse signal specifically includes:
the second antenna receives a first pulse signal simultaneously transmitted by a plurality of wireless communication nodes of the wireless communication group column;
the low-noise amplifier performs low-noise amplification processing on the first pulse signal received by the second antenna to generate a processed pulse signal, and sends the processed pulse signal to the mixer;
the second frequency generator generates a frequency signal and sends the frequency signal to the mixer;
the frequency mixer processes the frequency signal into a frequency mixing electric signal according to the processing pulse signal;
the limiting amplifier carries out limiting amplification processing on the mixing electric signal to generate an amplified electric signal;
the second modulator performs protocol conversion on the amplified electrical signal to generate a first communication electrical signal;
the second photoelectric converter converts the first communication electrical signal into a first communication optical signal.
6. The wireless communication method of claim 5, wherein the method further comprises:
the first signal optical fiber transmits a second signal optical signal;
the plurality of first passive optical splitters respectively process second signal optical signals transmitted by the first signal optical fibers to obtain second branch optical signals;
the second photoelectric converter receives the second branch optical signal transmitted by the corresponding first passive optical splitter, converts the second branch optical signal into a second electric signal, and sends the second electric signal to the second modulator;
the second frequency generator generates a frequency signal and sends the frequency signal to the second modulator;
the second modulator receives a synchronous sending instruction sent by the synchronous controller, modulates the second electric signal into the frequency signal according to the synchronous sending instruction, generates a second synchronous driving signal and sends the second synchronous driving signal to the power amplifier;
the power amplifier amplifies the second synchronous driving signal to generate an amplified second synchronous driving signal;
and the second antenna sends a second pulse signal according to the second synchronous driving signal, so that each wireless signal transceiving node of the wireless signal transceiving chain synchronously sends the same second pulse signal at the same time under the control of the synchronous controller.
7. The wireless communication method according to claim 6, wherein the wireless communication group comprises signal processors respectively connected to the plurality of wireless communication nodes; after the second antenna transmits a second pulse signal according to the second synchronous driving signal, so that each wireless signal transceiving node of a wireless signal transceiving chain simultaneously and synchronously transmits the same second pulse signal under the control of the synchronous controller, the method further comprises:
each first antenna of the plurality of wireless communication nodes receives a second pulse signal transmitted by the wireless signal transceiving node;
the first modulator demodulates the second pulse signal to generate a second communication electric signal;
the first photoelectric converter generates a second communication optical signal corresponding to the second communication electric signal generated by the first demodulator;
and the signal processor receives the second communication optical signal sent by each wireless communication node respectively and performs filtering processing to obtain a received optical signal.
8. The wireless communication method of claim 7, wherein the wireless communication group further comprises a second group optical fiber; after the signal processor receives the second communication optical signal sent by each wireless communication node and performs filtering processing to obtain a received optical signal, the method further includes:
and the second group of column optical fibers transmit the received optical signals sent by the signal processor.
9. The wireless communication method according to claim 8, wherein the wireless communication group further comprises a first optical communicator; after the second set of column fibers transmits the received optical signal sent by the signal processor, the method further comprises:
the first optical communicator processes the received optical signals transmitted by the second set of column optical fibers.
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| CN108390896B (en) * | 2018-05-08 | 2023-09-29 | 北京凤凰汇通科技有限公司 | Vehicle-ground auxiliary communication system |
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