CN113765836B - Signal transmission method, signal transmission device, computer equipment and storage medium - Google Patents
Signal transmission method, signal transmission device, computer equipment and storage medium Download PDFInfo
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- CN113765836B CN113765836B CN202010504724.5A CN202010504724A CN113765836B CN 113765836 B CN113765836 B CN 113765836B CN 202010504724 A CN202010504724 A CN 202010504724A CN 113765836 B CN113765836 B CN 113765836B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0018—Arrangements at the transmitter end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0024—Carrier regulation at the receiver end
- H04L2027/0026—Correction of carrier offset
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The application relates to a signal transmission method, a signal transmission device, a computer device and a storage medium. The method comprises the following steps: receiving a first synchronous signaling broadcast by a second communication node; determining a reference communication node in the second communication node, and acquiring a static frequency offset value between the reference communication node and the reference communication node according to a first synchronous signaling of the reference communication node; acquiring a first transmission signal to be transmitted, and performing frequency offset compensation on the first transmission signal to be transmitted according to the static frequency offset value to acquire a target transmission signal; broadcasting a second synchronous signaling, and sending the target transmission signal to the second communication node, wherein the second synchronous signaling is used for indicating the second communication node to acquire an instantaneous frequency offset value according to the second synchronous signaling broadcasted by the first communication node, and performing frequency offset compensation on the target transmission signal according to the instantaneous frequency offset value. According to the method, the frequency difference between the sending end and the receiving end is effectively compensated through the first synchronous signaling and the second synchronous signaling, and the communication efficiency is high.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a signal transmission method, a signal transmission device, a computer device, and a storage medium.
Background
In a wireless communication system, frequency deviation, i.e., frequency offset, occurs between different communication nodes due to different clocks. The frequency offset is a multiplicative noise that degrades the signal-to-noise ratio of a transmitted signal in a communication system. In order to cope with the frequency offset problem of the communication system, there are two main solutions: firstly, a high-precision atomic clock is used as a clock source, but the atomic clock has the defects of high cost, large volume, high power consumption and the like, and the problem of communication performance reduction caused by Doppler frequency offset due to movement of a communication node cannot be solved; secondly, training sequences are added at the starting position and the ending position of the transmitted signal, the receiver calculates the frequency offset of the received signal independently through the training sequences at the starting position and the ending position, and further frequency offset compensation is carried out on the received signal independently, however, adding the training sequences to the transmitted signal causes the receiver to increase the time delay of signal processing, and the training sequences do not carry useful data information, so that the throughput rate of actual data communication is reduced, and the communication efficiency is reduced.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a signal transmission method, apparatus, computer device, and storage medium.
A signal transmission method applied to a first communication node, the method comprising:
receiving a first synchronous signaling broadcast by a second communication node;
when the first communication node is a slave communication node, determining a reference communication node tracked by the first communication node in the second communication node, and acquiring a static frequency offset value between the first communication node and the reference communication node according to a first synchronous signaling of the reference communication node;
acquiring a first transmission signal to be transmitted, and performing frequency offset compensation on the first transmission signal to be transmitted according to the static frequency offset value to obtain a target transmission signal;
broadcasting a second synchronous signaling of the first communication node, and sending the target transmission signal to the second communication node, wherein the second synchronous signaling of the first communication node is used for indicating the second communication node to acquire an instantaneous frequency offset value according to the second synchronous signaling of the first communication node, and performing frequency offset compensation on the received target transmission signal according to the instantaneous frequency offset value.
In one embodiment, after the step of receiving the first synchronization signaling broadcast by the second communication node, the method further includes:
Receiving a second synchronous signaling broadcast by the second communication node;
acquiring an instantaneous frequency offset value between the first communication node and the second communication node according to a second synchronous signaling of the second communication node;
and receiving a second transmission signal sent by the target second communication node, and performing frequency offset compensation on the received second transmission signal according to the instantaneous frequency offset value corresponding to the target second communication node.
In one embodiment, the first synchronization signaling sent by the second communication node is received in a first time period; transmitting the second synchronization signaling to the second communication node in a second time period; wherein the first time period is greater than the second time period.
In one embodiment, the first synchronization signaling and the second synchronization signaling each include a training sequence and a control word corresponding to each communication node.
A signal transmission method applied to a second communication node, the method comprising:
receiving a second synchronous signaling broadcast by the first communication node;
acquiring an instantaneous frequency offset value between the second communication node and the first communication node according to a second synchronous signaling of the first communication node;
Receiving a target transmission signal sent by the first communication node, and performing frequency offset compensation on the received target transmission signal according to an instantaneous frequency offset value between the target transmission signal and the first communication node; the target transmission signal comprises a transmission signal after the first communication node performs frequency offset compensation on a first transmission signal to be transmitted according to a static frequency offset value between the first communication node and a reference communication node, wherein the static frequency offset value is obtained by the first communication node according to a first synchronous signaling transmitted by the reference communication node.
A method of signal transmission, the method comprising:
the first communication node receives a first synchronous signaling broadcast by the second communication node;
when the first communication node is a slave communication node, the first communication node determines a reference communication node tracked by the first communication node in the second communication node, and acquires a static frequency offset value between the first communication node and the reference communication node according to a first synchronous signaling of the reference communication node;
the first communication node acquires a first transmission signal to be transmitted, and performs frequency offset compensation on the first transmission signal to be transmitted according to the static frequency offset value to obtain a target transmission signal;
The first communication node broadcasts a second synchronous signaling of the first communication node and sends the target transmission signal to the second communication node;
the second communication node receives a second synchronous signaling broadcast by the first communication node;
the second communication node obtains an instantaneous frequency offset value between the first communication node and the second communication node according to a second synchronous signaling of the first communication node;
the second communication node receives the target transmission signal sent by the first communication node, and performs frequency offset compensation on the received target transmission signal according to the instantaneous frequency offset value between the second communication node and the first communication node.
A signal transmission apparatus for use with a first communication node, the apparatus comprising:
the first synchronous signaling receiving module is used for receiving the first synchronous signaling broadcast by the second communication node;
the static frequency offset acquisition module is used for determining a reference communication node tracked by the first communication node in the second communication node when the first communication node is a slave communication node, and acquiring a static frequency offset value between the first communication node and the reference communication node according to a first synchronous signaling of the reference communication node;
The transmission signal acquisition module is used for acquiring a first transmission signal to be transmitted, and performing frequency offset compensation on the first transmission signal to be transmitted according to the static frequency offset value to obtain a target transmission signal;
the transmission signal sending module is used for broadcasting a second synchronous signaling of the first communication node and sending the target transmission signal to the second communication node, wherein the second synchronous signaling of the first communication node is used for indicating the second communication node to acquire an instantaneous frequency offset value according to the second synchronous signaling of the first communication node, and performing frequency offset compensation on the target transmission signal according to the instantaneous frequency offset value.
A signal transmission apparatus for use in a second communication node, the apparatus comprising:
a second synchronous signaling receiving module, configured to receive a second synchronous signaling broadcast by the first communication node;
the instantaneous frequency offset calculation module is used for acquiring an instantaneous frequency offset value between the second communication node and the first communication node according to the second synchronous signaling of the first communication node;
the communication signal receiving module is used for receiving a target transmission signal sent by the first communication node, and carrying out frequency offset compensation on the received target transmission signal according to an instantaneous frequency offset value between the communication signal receiving module and the first communication node; the target transmission signal comprises a transmission signal after the first communication node performs frequency offset compensation on a first transmission signal to be transmitted according to a static frequency offset value between the first communication node and a reference communication node, wherein the static frequency offset value is obtained by the first communication node according to a first synchronous signaling transmitted by the reference communication node.
A communication device comprising a memory storing a computer program and a processor implementing the steps of the above method when the processor executes the computer program.
A computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method described above.
The signal transmission method, the signal transmission device, the computer equipment and the storage medium are used for receiving the first synchronous signaling broadcast by the second communication node; determining a reference communication node in the second communication node, and acquiring a static frequency offset value between the reference communication node and the reference communication node according to a first synchronous signaling of the reference communication node; acquiring a first transmission signal to be transmitted, and performing frequency offset compensation on the first transmission signal to be transmitted according to the static frequency offset value to acquire a target transmission signal; broadcasting a second synchronous signaling, and sending the target transmission signal to the second communication node, wherein the second synchronous signaling is used for indicating the second communication node to acquire an instantaneous frequency offset value according to the second synchronous signaling, and performing frequency offset compensation on the target transmission signal according to the instantaneous frequency offset value. The method acquires the frequency offset between communication nodes through different synchronous signaling, wherein the first synchronous signaling is used for tracking an upper stage to realize tracking the slowly-changed frequency offset so as to carry out tracking the slowly-changed frequency offset compensation of the static frequency offset in the transmission process, the second synchronous signaling is used for tracking the instantaneous Doppler frequency offset caused by the movement of the communication nodes so as to carry out instantaneous Doppler frequency offset compensation in the receiving process, and the frequency difference between a transmitting end and a receiving end is effectively compensated through the first synchronous signaling and the second synchronous signaling, and the data waveform does not need to carry a training sequence for calculating the frequency offset, so that the communication efficiency is high.
Drawings
FIG. 1 is an application environment diagram of a signal transmission method in one embodiment;
FIG. 2 is a flow chart of a signal transmission method in one embodiment;
FIG. 3 is a schematic diagram of first synchronization signaling or second synchronization signaling in one embodiment;
FIG. 4A is a schematic diagram of frequency offset calculation in one embodiment;
FIG. 4B is a schematic diagram of frequency offset calculation according to another embodiment;
FIG. 5 is a flowchart of a signal transmission method according to another embodiment;
fig. 6 is a flowchart of a signal transmission method in yet another embodiment;
fig. 7 is a schematic diagram of a communication system after the communication node 3 moves in one embodiment;
FIG. 8A is a diagram illustrating a transmission period of a first synchronization signaling and a second synchronization signaling in one embodiment;
fig. 8B is a schematic diagram illustrating a signal transmission procedure performed by the communication node 2 in one embodiment;
FIG. 8C is a schematic diagram of an embodiment of a frequency offset compensation process;
FIG. 9 is a block diagram of a signal transmission device in one embodiment;
fig. 10 is a block diagram showing the structure of a signal transmission apparatus in yet another embodiment;
FIG. 11 is an internal block diagram of a computer device in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
The frequency offset compensation method provided by the application can be applied to an application environment shown in fig. 1. Wherein the different communication nodes communicate with the different communication nodes through a network. Each communication node may be an equivalent communication entity, and for example, different communication nodes may be different base stations, different communication stations, and the like.
In one embodiment, as shown in fig. 2, a frequency offset compensation method is provided, which is applied to fig. 1 and is illustrated by taking a certain communication node as a first communication node and taking communication nodes except the first communication node as second communication nodes, and includes the following steps:
step S210, receiving a first synchronization signaling broadcast by the second communication node.
Step S220, when the first communication node is a slave communication node, determining a reference communication node tracked by the first communication node in the second communication node, and acquiring a static frequency offset value between the first communication node and the reference communication node according to a first synchronous signaling of the reference communication node.
In the communication network, each communication node (including the first communication node and the second communication node) sends first synchronization signaling mutually, and after each communication node receives the first synchronization signaling sent by other communication nodes, the frequency offset between each communication node and other communication nodes can be obtained through calculation according to the first synchronization signaling.
Wherein the reference communication node may be understood as a communication node of a previous level of a first communication node in the communication network; the communication network comprises a master communication node and slave communication nodes, wherein the master communication node can be understood as a master station, one and only one master station exists in the communication network, and specifically, each communication node in the communication network can compete for the master station, namely, any communication node in the communication network can be used as the master station; besides the communication node serving as the master station, other communication nodes are all the subordinates of the master station, namely the slave communication nodes, and the sending clocks of the slave communication nodes are directly or indirectly aligned to the sending clocks of the master communication nodes serving as the master station, so that the rough clock alignment in the communication network is realized.
Specifically, a certain communication node in the communication network is used as a first communication node, the first communication node receives first synchronization signaling of other communication nodes (namely, a second communication node) in the communication network, a reference communication node is determined from the other communication nodes, and then a static frequency offset value between the first communication node and the reference communication node is obtained according to the first synchronization information of the reference communication node. And acquiring a static frequency offset value between the first communication node and the reference communication node by referring to the first synchronization information of the communication node. The first communication node receives a first synchronization signaling of the reference communication node, acquires a static frequency offset value according to the first synchronization signaling of the reference communication node, and can acquire the static frequency offset value through a time domain convolution method or a frequency domain point division average method.
Step S230, a first transmission signal to be sent is obtained, and frequency offset compensation is performed on the first transmission signal to be sent according to the static frequency offset value, so as to obtain a target transmission signal.
After the first communication node obtains the first transmission signal to be sent, before sending the first transmission scarlet, the first communication node performs frequency offset compensation on the first transmission signal to be sent by using the obtained static frequency offset value to obtain a final target transmission signal to be sent, so that the clock of the sent target transmission signal is aligned with the clock of the reference communication node.
Step S240, broadcasting a second synchronization signaling of the first communication node, and sending the target transmission signal to the second communication node, where the second synchronization signaling of the first communication node is used to instruct the second communication node to obtain an instantaneous frequency offset value according to the second synchronization signaling of the first communication node, and perform frequency offset compensation on the received target transmission signal according to the instantaneous frequency offset value.
The first communication node broadcasts and transmits a second synchronous signaling before communicating with other communication nodes (namely, second communication nodes), and each second communication node calculates an instantaneous frequency offset value between the first communication node and the second communication node according to the second synchronous signaling transmitted by the first communication node when receiving the second synchronous signaling; the first communication node sends the target transmission signal to the second communication node, and the second communication node performs frequency offset compensation on the received target transmission signal according to the instantaneous frequency offset value between the second communication node and the first communication node after receiving the target transmission signal.
Specifically, the second communication node acquires an instantaneous frequency offset value between the second communication node and the first communication node according to a second synchronous signaling broadcast by the first communication node, and specifically, may acquire a static frequency offset value through a time domain convolution method or a frequency domain point division average method.
In the frequency offset compensation method, the first communication node receives a first synchronous signaling broadcast by the second communication node; determining a reference communication node in the second communication node, and acquiring a static frequency offset value between the reference communication node and the reference communication node according to a first synchronous signaling of the reference communication node; acquiring a first transmission signal to be transmitted, and performing frequency offset compensation on the first transmission signal to be transmitted according to the static frequency offset value to acquire a target transmission signal; broadcasting a second synchronous signaling, and sending the target transmission signal to the second communication node, wherein the second synchronous signaling is used for indicating the second communication node to acquire an instantaneous frequency offset value according to the second synchronous signaling broadcasted by the first communication node, and performing frequency offset compensation on the target transmission signal according to the instantaneous frequency offset value. The method acquires frequency offset between communication nodes through different synchronous signaling, wherein a first synchronous signaling is used for tracking an upper stage, acquires a static frequency offset value according to a first synchronous signaling of a reference communication node, realizes tracking slowly-changed frequency offset, realizes tracking slowly-changed static frequency offset compensation in the sending process, realizes coarse alignment with clocks of all communication nodes in a communication network, and a second synchronous signaling is used for tracking instantaneous Doppler frequency offset caused by movement of the communication nodes.
In one embodiment, first synchronization signaling sent by a second communication node is received in a first time period; transmitting a second synchronization signaling value communication node for a second time period; wherein the first time period is greater than the second time period.
Specifically, the first time period may be a long period, the second communication node, especially the reference communication node, broadcasts the first synchronization signaling in the first time period, the first communication node receives the first synchronization signaling of the second communication node, especially the reference communication node in the first time period, and obtains the frequency offset value between the first communication node and the reference communication node through the first synchronization signaling of the reference communication node, so as to track the slowly-changed frequency offset, and further realize the frequency spectrum compensation in the transmitting process. The second time period may be a short period, and the first communication node broadcasts the second synchronization signaling value in the second time period, so that the second communication node obtains an instantaneous doppler frequency offset caused by movement of the first communication node or the second communication node, so as to track the instantaneous doppler frequency spectrum, and when the second communication node receives a transmission signal of the first communication node, the second communication node performs frequency offset compensation on the transmission information of the first communication node, thereby realizing frequency spectrum compensation in a receiving process.
Wherein, in one embodiment, the first time period is substantially greater than the second time period, e.g., the first time period is in seconds and the second time period is in milliseconds.
In one embodiment, after the step of receiving the first synchronization signaling broadcast by the second communication node, the method further comprises: receiving a second synchronous signaling broadcast by a second communication node; acquiring an instantaneous frequency offset value between the first communication node and the second communication node according to a second synchronous signaling of the second communication node; and receiving a second transmission signal sent by the target second communication node, and performing frequency offset compensation on the received second transmission signal according to the instantaneous frequency offset value corresponding to the target second communication node.
The present embodiment is a procedure in which a first communication node receives transmission signals transmitted by other communication nodes (i.e., second communication nodes). The second communication node broadcasts a second synchronous signaling before transmitting the transmission signal, and the first communication node calculates an instantaneous frequency offset value between the first communication node and the corresponding second communication node according to the second synchronous signaling after receiving the second synchronous signaling of the second communication node. And the first communication node performs frequency offset compensation on the received transmission signal after receiving the transmission signal sent by the target second communication node. It will be understood that the instantaneous frequency offset value refers to a frequency offset value caused by an instantaneous doppler shift caused by movement of a communication node, and the target second communication node refers to a communication node that transmits a second transmission signal to the first communication node among the second communication nodes other than the first communication node.
In this embodiment, the second synchronization signaling of the second communication node is received to obtain an instantaneous frequency offset value between the second synchronization signaling and the second communication node, and further, the instantaneous frequency offset value is used to perform frequency offset compensation on the transmission signal sent by the second communication node, so that the frequency difference between the sending end (the second communication node) and the receiving end (the first communication node) is effectively compensated, and the communication performance is effectively improved.
In one embodiment, the first synchronization signaling and the second synchronization signaling each include a training sequence and a control word corresponding to each communication node.
The first synchronous signaling and the second synchronous signaling both comprise training sequences and control words of corresponding communication nodes. The training sequence can be PN sequence or Zadoff-Chu sequence; the control word is used to identify which communication node the first or second synchronization signaling is sent by, in particular an identifier of the communication node.
Further, in one embodiment, the first synchronization signaling and the second synchronization signaling each include two training sequences, wherein a first time interval is spaced between the two training sequences in the first synchronization signaling, and a second time interval is spaced between the two training sequences in the second synchronization signaling. As shown in fig. 3, the first synchronization signaling and the second synchronization signaling may be shown in fig. 3, where the time intervals between two training sequences in the first synchronization information and the second synchronization signaling are different.
After the first communication node or the second communication node obtains the first synchronization signaling or the second synchronization signaling, a frequency offset value can be obtained according to a time domain convolution method, specifically, a local original sequence is utilized to perform correlation calculation on two training sequences in the first synchronization signaling or the second synchronization signaling so as to obtain two highest correlation energy points, as shown in fig. 4A, correlation complex values corresponding to the two highest correlation energy points are recorded as x+y x j and x '+y' xj, and then a phase rotation value ΔΦ can be obtained according to a formula ΔΦ=angle (x '+y' xj) -angle (x+y x j), and finally, a frequency offset value Δf is obtained according to a formula Δf=ΔΦ/(2×pi×Δt) (unit: hz); the frequency offset value can also be obtained according to a frequency domain point division average method, specifically, the time domain convolution is equivalent to frequency domain point multiplication, as shown in fig. 4B, after the synchronous signaling is obtained, the data stream of the synchronous signaling in the time domain is converted into data in the frequency domain, the phase rotation value of the synchronous signaling at each subcarrier is obtained in the frequency domain, the average value of the phase rotation values of the subcarriers is obtained, namely, the phase rotation value of the center frequency point is obtained, and finally, the frequency offset value Δf is obtained through the formula Δf=Δphi/(2xpi×Δt) (unit: hz).
In this embodiment, by sending or receiving different first synchronization signaling and second synchronization signaling, the clock of the upper stage can be tracked, so as to track the slowly varying frequency offset and track the movement of the communication node, so as to track the instantaneous doppler frequency offset, and effectively improve the communication performance.
In one embodiment, as shown in fig. 5, the signal transmission method includes the steps of:
step S510, receiving a second synchronous signaling broadcast by the first communication node;
step S520, according to the second synchronous signaling of the first communication node, obtaining the instantaneous frequency offset value between the second communication node and the first communication node;
step S530, receiving a target transmission signal sent by a first communication node, and performing frequency offset compensation on the received target transmission signal according to an instantaneous frequency offset value between the target transmission signal and the first communication node; the target transmission signal comprises a transmission signal after the first communication node performs frequency offset compensation on the first transmission signal to be transmitted according to a static frequency offset value between the first communication node and the reference communication node, wherein the static frequency offset value is obtained by the first communication node according to a first synchronous signaling transmitted by the reference communication node.
The present embodiment is a process in which the second communication node receives the transmission signal sent by the first communication node. The first communication node broadcasts a second synchronous signaling before transmitting the transmission signal, and the second communication node calculates an instantaneous frequency offset value between the second communication node and the first communication node according to the second synchronous signaling after receiving the second synchronous signaling of the first communication node. And the second communication node performs frequency offset compensation on the received transmission signal after receiving the transmission signal sent by the first communication node. It is understood that the instantaneous frequency offset value refers to a frequency offset value caused by an instantaneous doppler shift caused by movement of the communication node.
In this embodiment, the second synchronization signaling of the first communication node is received to obtain the instantaneous frequency offset value between the second synchronization signaling and the first communication node, so that the instantaneous frequency offset value is used to perform frequency offset compensation on the transmission signal sent by the first communication node, thereby effectively improving the communication performance.
In one embodiment, as shown in fig. 6, the signal transmission method includes:
step S610, the first communication node receives a first synchronous signaling broadcast by the second communication node;
step S620, when the first communication node is a slave communication node, the first communication node determines a reference communication node tracked by the first communication node in the second communication node, and acquires a static frequency offset value between the first communication node and the reference communication node according to a first synchronous signaling of the reference communication node;
step S630, the first communication node obtains a first transmission signal to be sent, and performs frequency offset compensation on the first transmission signal to be sent according to the static frequency offset value to obtain a target transmission signal;
step S640, the first communication node broadcasts the second synchronization signaling of the first communication node, and sends the target transmission signal to the second communication node;
step S650, the second communication node receives the second synchronization signaling broadcast by the first communication node;
Step S660, the second communication node obtains the instantaneous frequency offset value between the first communication node and the second communication node according to the second synchronous signaling of the first communication node;
in step S670, the second communication node receives the target transmission signal sent by the first communication node, and performs frequency offset compensation on the received target transmission signal according to the instantaneous frequency offset value between the second communication node and the first communication node.
Taking the communication network shown in fig. 1 as an example, the technical solution of the above embodiment will be further described. In the communication network of fig. 1, the communication nodes periodically transmit first synchronization signaling to each other according to a first time period. The value of the first time period is different in different communication protocols, and the first synchronization information includes a control word corresponding to the communication node, for example, a communication node ID.
After each communication node receives the first synchronous signaling of other communication nodes, the static frequency offset value between the communication node and other different communication nodes is correspondingly calculated, and whether the static frequency offset value corresponding to other different communication nodes is tracked and compensated is determined. It will be appreciated that when a certain communication node is a reference communication node, the communication nodes in the communication network track and compensate the static frequency offset value between the communication nodes and the reference communication node.
For example, in the communication network in fig. 1, assuming that the communication node 1 is a master station (i.e., a master communication node), for the communication node 2 and the communication node 3, the communication node 1 serves as a reference communication node for the communication node 2 and the communication node 3, the transmission clocks of the communication node 2 and the communication node 3 are aligned with the transmission clock of the communication node 1, that is, the communication node 2 and the communication node 3 each track and compensate the static frequency offset value of the communication node 1, and the communication node 2 and the communication node 3 serve as slave communication nodes, which can be respectively denoted as a slave station 2 and a slave station 3. In the process of transmitting a transmission signal by the communication node 2 or the communication node 3, it is necessary to perform frequency offset compensation for the transmitted transmission signal according to a static frequency offset value with the communication node 1.
In contrast, for the communication node 4, the communication node 2 is a reference communication node of the communication node 4, the transmission clock of the communication node 4 is aligned with the transmission clock of the communication node 2, when the communication node 4 transmits a transmission signal, the frequency offset compensation needs to be performed on the transmitted transmission signal according to the static frequency offset value with the communication node 2, the transmission clock of the communication node 1 is indirectly equivalently aligned, and the communication node 4 is a slave communication node and can be marked as a slave station 4. At this time, the sending clocks of the slave station 2, the slave station 3 and the slave station 4 in the communication network are equivalently aligned to the master station (the communication node 1), thus completing the rough alignment of clocks in the network and completing the static frequency offset compensation.
When any of the communication nodes in the communication network are in data communication with each other, the communication node typically transmits a second synchronization signaling to the communication node with which it is in data communication. The second synchronous signaling carries training sequence and control word for calculating frequency deviation. After receiving the second synchronous signaling sent by other communication nodes, any communication node calculates the instantaneous frequency offset value between the communication node and other communication nodes, and records the control word of the communication node. And when receiving the transmission data of other communication nodes, compensating the instantaneous frequency offset value of the corresponding communication node to the received transmission signal in advance, so as to realize the frequency offset compensation of the received transmission signal in the process of receiving the transmission signal, namely compensating the frequency offset caused by the instantaneous Doppler frequency shift caused by the movement of the communication node, and finishing the instantaneous frequency offset compensation. It is understood that the instantaneous frequency offset compensation does not separate from the master and slave stations, and is applicable between the master and slave stations and between the slave and slave stations.
Taking the communication network in fig. 1 as an example, when the communication node 3 moves to the dotted line, as shown in fig. 7, the doppler frequency offset caused by the movement of the communication node 3 is not known by the upper-level station communication node 1 (tracking reference node) of the communication node 3, and the doppler frequency offset is introduced by the movement of the communication node 3. At this time, when the communication node 3 communicates with other communication nodes in the communication network, the single compensation of the static frequency offset value is performed during the transmission, and the communication effect cannot be ensured, and even the communication failure is deteriorated. Therefore, before the communication node 3 sends the transmission signal, a second synchronization signaling is broadcast and sent, after the communication node 1, the communication node 2 and the communication node 4 receive the second synchronization signaling sent by the communication node 3, the instantaneous frequency offset value between the communication node 1 and the communication node 3 is calculated and recorded, and when the transmission signal sent by the communication node 3 is received immediately, the frequency offset compensation is performed on the transmission signal according to the instantaneous frequency offset value between the communication node 3, so that the communication effect is ensured.
Further, referring to fig. 8A and 8B, the communication node 1 is set as a master station (i.e., a master communication node), and the communication node 2 in fig. 1 is taken as an example to further explain the technical solution in the above embodiment. In the communication network, the communication node 1, the communication node 2, the communication node 3, and the communication node 4 periodically transmit first synchronization signaling to each other at a first time period (as shown in fig. 8A). After receiving the first synchronization signaling sent by the communication node 1, the communication node 3 and the communication node 4, the communication node 2 obtains the static frequency offset value Δf between the communication node and the corresponding communication node by using the first synchronization signaling t12 . The communication node 2 decides to take care of the communication node 1, i.e. when the communication node 2 sends a transmission signal, the static frequency offset Δf with the communication node 1 is used t12 And after the frequency offset compensation is carried out on the transmission signal, the transmission signal after the frequency offset compensation is sent to other communication nodes.
Meanwhile, the communication node 2 periodically transmits second synchronization signaling to the communication node 1, the communication node 3, and the communication node 4 at a second time period (as shown in fig. 8A); taking the communication node 4 as an example, after the communication node 4 receives the second synchronization signaling of the communication node 2, the communication node 4 calculates the instantaneous frequency offset value Δf between the communication node 2 according to the second synchronization signaling r24 When the communication node 2 transmits a transmission signal to the communication node 4, the communication node 4 performs the instantaneous frequency offset value Δf of the received transmission signal r24 Frequency offset compensation of (a); for another example, taking the communication node 1 as an example, after the communication node 1 receives the second synchronization signaling of the communication node 2, the communication node 4 calculates the instantaneous frequency offset Δf with the communication node 2 based on the second synchronization signaling r12 When the communication node 2 transmits a transmission signal to the communication node 1, the communication node 1 performs instantaneous frequency offset value Δf of the received transmission signal r12 Frequency offset compensation of (a).
For another example, the communication node 1 is set as a master station (i.e., a master reference node), and the communication node 1 in fig. 1 is taken as an example to further describe the technical solution in the above embodiment. In the communication network, communication node 1, communication node 2, communication node 3 and communication node 4 periodically transmit first synchronization signaling to each other with a first time period. Because the communication node 1 is the main reference node, the decision of the communication node 2, the communication node 3 and the communication node 4 is in line with the communication node 1, and when the communication node 1 sends a transmission signal, the communication node 1 does not need to perform static frequency offset compensation in the sending process.
Meanwhile, the communication node 1 periodically transmits a second synchronization signaling to the communication nodes 2 and 3 in a second time period; taking the communication node 3 as an example, after the communication node 3 receives the second synchronous signaling of the communication node 1, the communication node 3 calculates an instantaneous frequency offset value between the communication node 1 and the communication node 3 according to the second synchronous signaling, and when the communication node 1 sends a transmission signal to the communication node 3, the communication node 3 performs frequency offset compensation on the instantaneous frequency offset value of the received transmission signal; for another example, taking the communication node 2 as an example, after the communication node 2 receives the second synchronization signaling of the communication node 1, the communication node 2 calculates an instantaneous frequency offset value between the communication node 2 and the communication node 1 according to the second synchronization signaling, and when the communication node 1 sends the transmission signal to the communication node 2, the communication node 2 performs frequency offset compensation on the instantaneous frequency offset value of the received transmission signal. The frequency offset compensation process of the transmission signal is shown in fig. 8C.
It should be understood that, although the steps in the flowcharts of fig. 2, 5, and 6 are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least a portion of the steps of fig. 2, 5, and 6 may include a plurality of steps or stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the execution of the steps or stages is not necessarily sequential, but may be performed in turn or alternately with at least a portion of the steps or stages of other steps or steps.
In one embodiment, as shown in fig. 9, there is provided a signal transmission apparatus including: a first synchronous signaling receiving module 910, a static frequency offset obtaining module 920, a transmission signal obtaining module 930, and a transmission signal sending module 940, where:
a first synchronization signaling receiving module 910, configured to receive a first synchronization signaling broadcast by the second communication node;
The static frequency offset obtaining module 920 is configured to determine a reference communication node tracked by the first communication node in the second communication node when the first communication node is a slave communication node, and obtain a static frequency offset value between the first communication node and the reference communication node according to a first synchronization signaling of the reference communication node;
the transmission signal acquisition module 930 is configured to acquire a first transmission signal to be sent, and perform frequency offset compensation on the first transmission signal to be sent according to the static frequency offset value to obtain a target transmission signal;
the transmission signal sending module 940 is configured to broadcast a second synchronization signaling of the first communication node and send a target transmission signal to the second communication node, where the second synchronization signaling of the first communication node is configured to instruct the second communication node to obtain an instantaneous frequency offset value according to the second synchronization signaling of the first communication node, and perform frequency offset compensation on the received target transmission signal according to the instantaneous frequency offset value.
In one embodiment, the signal transmission apparatus further comprises a signal receiving module for: receiving a second synchronous signaling broadcast by a second communication node; acquiring an instantaneous frequency offset value between the first communication node and the second communication node according to a second synchronous signaling of the second communication node; and receiving a second transmission signal sent by the target second communication node, and performing frequency offset compensation on the received second transmission signal according to the instantaneous frequency offset value corresponding to the target second communication node.
In one embodiment, first synchronization signaling sent by a second communication node is received in a first time period; transmitting a second synchronization signaling to the second communication node in a second time period; wherein the first time period is greater than the second time period.
In one embodiment, the first synchronization signaling and the second synchronization signaling each include a training sequence and a control word corresponding to each communication node.
In one embodiment, as shown in fig. 10, there is provided a signal transmission apparatus including: a second synchronous signaling receiving module 1010, an instantaneous frequency offset calculating module 1020, and a communication signal receiving module 1030, wherein:
a second synchronization signaling receiving module 1010, configured to receive a second synchronization signaling broadcast by the first communication node;
the instantaneous frequency offset calculation module 1020 is configured to obtain an instantaneous frequency offset value between the second communication node and the first communication node according to the second synchronization signaling of the first communication node;
the communication signal receiving module 1030 is configured to receive a target transmission signal sent by the first communication node, and perform frequency offset compensation on the received target transmission signal according to an instantaneous frequency offset value between the communication signal receiving module 1030 and the first communication node; the target transmission signal comprises a transmission signal after the first communication node performs frequency offset compensation on the first transmission signal to be transmitted according to a static frequency offset value between the first communication node and the reference communication node, wherein the static frequency offset value is obtained by the first communication node according to a first synchronous signaling transmitted by the reference communication node.
For specific limitations of the signal transmission device, reference may be made to the above limitations of the signal transmission method, and no further description is given here. The respective modules in the above-described signal transmission apparatus may be implemented in whole or in part by software, hardware, and combinations thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a communication device is provided, which may be a server, the internal structure of which may be as shown in fig. 11. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the computer equipment is used for storing information data such as static frequency offset values, instantaneous frequency offset values and the like between the computer equipment and other communication equipment. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a signal transmission method.
It will be appreciated by those skilled in the art that the structure shown in fig. 11 is merely a block diagram of a portion of the structure associated with the present application and is not limiting of the computer device to which the present application applies, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In an embodiment, there is also provided a computer device comprising a memory and a processor, the memory having stored therein a computer program, the processor implementing the steps of the method embodiments described above when the computer program is executed.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when executed by a processor, carries out the steps of the method embodiments described above.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, or the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (10)
1. A method of signal transmission, for use with a first communication node, the method comprising:
receiving a first synchronous signaling broadcast by a second communication node;
when the first communication node is a slave communication node, determining a reference communication node tracked by the first communication node in the second communication node, and acquiring a static frequency offset value between the first communication node and the reference communication node according to a first synchronous signaling of the reference communication node;
Acquiring a first transmission signal to be transmitted, and performing frequency offset compensation on the first transmission signal to be transmitted according to the static frequency offset value to obtain a target transmission signal;
broadcasting a second synchronous signaling of the first communication node, and sending the target transmission signal to the second communication node, wherein the second synchronous signaling of the first communication node is used for indicating the second communication node to acquire an instantaneous frequency offset value according to the second synchronous signaling of the first communication node, and performing frequency offset compensation on the received target transmission signal according to the instantaneous frequency offset value.
2. The method of claim 1, wherein after the step of receiving the first synchronization signaling broadcast by the second communication node, further comprising:
receiving a second synchronous signaling broadcast by the second communication node;
acquiring an instantaneous frequency offset value between the first communication node and the second communication node according to a second synchronous signaling of the second communication node;
and receiving a second transmission signal sent by a target second communication node, and performing frequency offset compensation on the received second transmission signal according to an instantaneous frequency offset value corresponding to the target second communication node.
3. The method of claim 1, wherein the first synchronization signaling sent by the second communication node is received for a first period of time; transmitting the second synchronization signaling to the second communication node in a second time period; wherein the first time period is greater than the second time period.
4. The method of claim 1, wherein the first synchronization signaling and the second synchronization signaling each comprise a training sequence and a control word corresponding to each communication node.
5. A method of signal transmission for a second communication node, the method comprising:
receiving a second synchronous signaling broadcast by the first communication node;
acquiring an instantaneous frequency offset value between the second communication node and the first communication node according to a second synchronous signaling of the first communication node;
receiving a target transmission signal sent by the first communication node, and performing frequency offset compensation on the received target transmission signal according to an instantaneous frequency offset value between the target transmission signal and the first communication node; the target transmission signal comprises a transmission signal after the first communication node performs frequency offset compensation on a first transmission signal to be transmitted according to a static frequency offset value between the first communication node and a reference communication node, wherein the static frequency offset value is obtained by the first communication node according to a first synchronous signaling transmitted by the reference communication node.
6. A method of signal transmission, the method comprising:
the first communication node receives a first synchronous signaling broadcast by the second communication node;
when the first communication node is a slave communication node, the first communication node determines a reference communication node tracked by the first communication node in the second communication node, and acquires a static frequency offset value between the first communication node and the reference communication node according to a first synchronous signaling of the reference communication node;
the first communication node acquires a first transmission signal to be transmitted, and performs frequency offset compensation on the first transmission signal to be transmitted according to the static frequency offset value to obtain a target transmission signal;
the first communication node broadcasts a second synchronous signaling of the first communication node and sends the target transmission signal to the second communication node;
the second communication node receives a second synchronous signaling broadcast by the first communication node;
the second communication node obtains an instantaneous frequency offset value between the first communication node and the second communication node according to a second synchronous signaling of the first communication node;
the second communication node receives the target transmission signal sent by the first communication node, and performs frequency offset compensation on the received target transmission signal according to the instantaneous frequency offset value between the second communication node and the first communication node.
7. A signal transmission apparatus for use with a first communication node, the apparatus comprising:
the first synchronous signaling receiving module is used for receiving the first synchronous signaling broadcast by the second communication node;
the static frequency offset acquisition module is used for determining a reference communication node tracked by the first communication node in the second communication node when the first communication node is a slave communication node, and acquiring a static frequency offset value between the first communication node and the reference communication node according to a first synchronous signaling of the reference communication node;
the transmission signal acquisition module is used for acquiring a first transmission signal to be transmitted, and performing frequency offset compensation on the first transmission signal to be transmitted according to the static frequency offset value to obtain a target transmission signal;
the transmission signal sending module is used for broadcasting a second synchronous signaling of the first communication node and sending the target transmission signal to the second communication node, wherein the second synchronous signaling of the first communication node is used for indicating the second communication node to acquire an instantaneous frequency offset value according to the second synchronous signaling of the first communication node, and performing frequency offset compensation on the target transmission signal according to the instantaneous frequency offset value.
8. A signal transmission apparatus for use with a second communication node, the apparatus comprising:
a second synchronous signaling receiving module, configured to receive a second synchronous signaling broadcast by the first communication node;
the instantaneous frequency offset calculation module is used for acquiring an instantaneous frequency offset value between the second communication node and the first communication node according to the second synchronous signaling of the first communication node;
the communication signal receiving module is used for receiving a target transmission signal sent by the first communication node, and carrying out frequency offset compensation on the received target transmission signal according to an instantaneous frequency offset value between the communication signal receiving module and the first communication node; the target transmission signal comprises a transmission signal after the first communication node performs frequency offset compensation on a first transmission signal to be transmitted according to a static frequency offset value between the first communication node and a reference communication node, wherein the static frequency offset value is obtained by the first communication node according to a first synchronous signaling transmitted by the reference communication node.
9. A communication device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 6 when the computer program is executed.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 6.
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