A beam alignment method for multi-node burst communication

Abstract

The present invention discloses a beam alignment method for multi-node burst communication, including: by setting a host device and multiple slave devices to determine the network node, three signal frames consisting of a pseudo-random sequence frame header with a cyclic prefix and a service data frame content are transmitted in a burst form to achieve optimal beam alignment of the host device and the multiple slave devices. The method of the present invention is applicable to beam alignment between multiple nodes, and does not require the configuration of narrow beam antennas and wide beam antennas at the same time for beam alignment. Only narrow beam antennas need to be set, and this embodiment is applicable to burst communication, which expands the scope of application of the beam alignment method and increases the applicability of the technology.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a beam alignment method for multi-node burst communication. Background Art

[0002] In wireless transmission, the transmission rate of wireless signals is usually above tens of GHz. Such high-frequency radio waves are highly directional. The transmitter and receiver are usually aligned to obtain the optimal transmission link. Beam alignment has many advantages. It can not only improve signal gain and reduce power consumption, but also has good anti-interception characteristics and can reduce interference. The prerequisite for beam alignment is to obtain the location information of both parties and be within the beam coverage distance.

[0003] Existing beam alignment technologies have the problems of being only applicable to beam alignment between two devices, not between multiple devices (nodes), requiring the configuration of narrow beam antennas and wide beam antennas at the same time, and not being applicable to burst communications, making the method less applicable. Summary of the invention

[0004] The purpose of the present invention is to provide a beam alignment method for multi-node burst communication. The purpose is to solve the problem that the existing technology is only applicable to beam alignment between two devices, cannot be used for beam alignment between multiple devices (nodes), requires the configuration of narrow beam antennas and wide beam antennas at the same time, is not applicable to burst communication, and makes the method less applicable.

[0005] To achieve the above object, the present invention is implemented through the following technical solutions:

[0006] The present invention provides a beam alignment method for multi-node burst communication, which is based on the Beidou navigation system and includes:

[0007] Step S1: setting a host device and multiple slave devices to determine network nodes;

[0008] Step S2: using three different pseudo-random sequences to obtain three pseudo-random sequence frame headers with cyclic prefixes;

[0009] Step S3: the host device uses the first pseudo-random sequence frame header among the three pseudo-random sequence frame headers to broadcast the beam to perform beam scanning;

[0010] Step S4: all the slave devices receive the first pseudo-random sequence frame header broadcast by the host device, and each of the slave devices calculates the first pseudo-random sequence frame header to determine the optimal wave position value;

[0011] Step S5: the host device transmits a second pseudo-random sequence frame header among the three pseudo-random sequence frame headers, and the slave device receives the second pseudo-random sequence frame header at a fixed wave position to perform coarse synchronization;

[0012] Step S6: According to the time slot table, all the slave devices transmit the third pseudo-random sequence frame header to the host device in a direction in the corresponding time slot. After the host device searches for the third pseudo-random sequence frame header, it determines the slave device corresponding to the received third pseudo-random sequence frame header, obtains the position of the network node, and performs fine synchronization;

[0013] Step S7: The host device receives the position of the network node in its round-trip time (RTT) time slot, and sends the position of all the network nodes to each of the slave devices in the host device's downlink time slot, so that the host device and each of the slave devices achieve optimal beam alignment.

[0014] Preferably, in step S2, when the host device uses the first pseudo-random sequence frame header to broadcast the beam, the beam position value transmitted by the beam and the first pseudo-random sequence corresponding to the first pseudo-random sequence frame header are sent to each of the slave devices.

[0015] Preferably, in step S2, when the host device broadcasts the beam, it polls all beam positions of the beam for multiple times to cover all areas, ensuring that each of the slave devices receives a complete round of signals of the beam.

[0016] Preferably, when the host device performs the broadcast, all the slave devices are set to a receiving state, and the slave devices poll the wave position once. The slave devices perform correlation operations through the first pseudo-random sequence frame header and obtain a capture peak through threshold comparison to determine the optimal wave position value.

[0017] Preferably, in step S5, the fixed wave position is the optimal wave position value determined in step S4.

[0018] Preferably, in step S5, the information sent by the host device to each of the slave devices includes: location information and time slot number of the host device, so as to perform coarse synchronization.

[0019] Preferably, in step S5, after the host device transmits the time slot of the second pseudo-random sequence frame header, a protection interval of a certain time is reserved for path delay and calculation time of the position receiving system in the host device.

[0020] Preferably, the certain period of time protection interval is set to 5ms.

[0021] Preferably, after searching for the third pseudo-random sequence frame header, the host device determines the beam with the corresponding slave device, adds a certain period of path delay, and sends a round-trip delay request to each of the slave devices in the next time slot. After receiving a response to the round-trip delay request, the host device determines the slave device corresponding to the response.

[0022] Preferably, after the host device and the plurality of slave devices complete the optimal beam alignment, they perform service communication according to the time slot table. The prior art has the problem that the beam alignment is only applicable to two devices, cannot be used for beam alignment between multiple devices (nodes), requires the configuration of narrow beam antennas and wide beam antennas at the same time, and is not applicable to burst communication, making the method less applicable.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention provides a beam alignment method for multi-node burst communication. The method is applicable to beam alignment between multiple nodes, and does not require the configuration of narrow beam antennas and wide beam antennas at the same time to perform beam alignment. Only the narrow beam antenna needs to be set. The present invention is applicable to burst communication, thereby expanding the scope of application of the beam alignment method. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for the description. Obviously, the drawings described below are an embodiment of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work:

[0026] Figure 1 A schematic diagram of the receiving and sending status of a first pseudo-random sequence by a host device and a slave device provided in one embodiment of the present invention;

[0027] Figure 2 A schematic diagram of the receiving and sending status of a second pseudo-random sequence by a host device and a slave device provided in one embodiment of the present invention;

[0028] Figure 3 A schematic diagram of the receiving and sending status of a third pseudo-random sequence by a host device and a slave device provided in an embodiment of the present invention;

[0029] Figure 4 A schematic diagram of a time slot structure provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The following is combined with Figures 1 to 4The beam alignment method for multi-node burst communication proposed in the present invention is further described in detail with specific implementation methods. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the drawings are in a very simplified form and are not in precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the implementation methods of the present invention. In order to make the purposes, features and advantages of the present invention more obvious and easy to understand, please refer to the drawings. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no technical substantive significance. Any structural modification, change in proportional relationship or adjustment of size, without affecting the effects that can be produced by the present invention and the purposes that can be achieved, should still fall within the scope of the technical content disclosed by the present invention.

[0031] Since the existing technology is only applicable to beam alignment between two devices, it cannot be used for beam alignment between multiple devices (nodes), it needs to configure narrow beam antennas and wide beam antennas at the same time, and it is not applicable to burst communication, the method has poor applicability.

[0032] This embodiment provides a beam alignment method for multi-node burst communication, including:

[0033] Step S1: setting a host device and multiple slave devices to determine network nodes;

[0034] Step S2: using three different pseudo-random sequences, namely a first pseudo-random sequence, a second pseudo-random sequence and a third pseudo-random sequence, to obtain three pseudo-random sequence frame headers with cyclic prefixes, including a first pseudo-random sequence frame header corresponding to the first pseudo-random sequence, a second pseudo-random sequence frame header corresponding to the second pseudo-random sequence, and a third pseudo-random sequence frame header corresponding to the third pseudo-random sequence.

[0035] When the host device uses the first pseudo-random sequence frame header to broadcast the beam, the wave position value transmitted by the beam and the first pseudo-random sequence corresponding to the first pseudo-random sequence frame header are sent to each of the slave devices. When the host device broadcasts the beam, all the wave positions of the beam are polled multiple times to cover all areas to ensure that each of the slave devices receives a complete round of signals of the beam. When the host device performs the broadcast, all the slave devices are set to a receiving state, and the slave device polls the wave position once. The slave device performs a correlation operation through the first pseudo-random sequence frame header and obtains a capture peak through threshold comparison to determine the optimal wave position value.

[0036] Step S3: The host device uses the first pseudo-random sequence frame header among the three pseudo-random sequence frame headers to broadcast the beam to perform beam scanning.

[0037] Step S4: All the slave devices receive the first pseudo-random sequence frame header broadcast by the host device, and each of the slave devices calculates the first pseudo-random sequence frame header to determine the optimal wave position value.

[0038] Step S5: The host device transmits a second pseudo-random sequence frame header among the three pseudo-random sequence frame headers, and the slave device receives the second pseudo-random sequence frame header at a fixed wave position to perform coarse synchronization. In this embodiment, the fixed wave position is the optimal wave position value determined in step S4.

[0039] The information sent by the host device to each of the slave devices includes: the location information and time slot number of the host device, so as to perform coarse synchronization.

[0040] After the host device transmits the time slot of the second pseudo-random sequence frame header, a certain time guard interval is reserved for path delay and calculation time of the position receiving system in the host device. In this embodiment, the certain time guard interval is preferably set to 5ms.

[0041] Step S6: According to the time slot table, all the slave devices transmit the third pseudo-random sequence frame header to the host device in a direction in the corresponding time slot. After the host device searches for the third pseudo-random sequence frame header, it determines the slave device corresponding to the received third pseudo-random sequence frame header, obtains the location of the network node, and performs fine synchronization. After the host device searches for the third pseudo-random sequence frame header, it determines the beam with the corresponding slave device and adds a certain time of path delay. In this embodiment, the preferred path delay is 1ms. In the next time slot, the host device sends a round-trip delay request to each of the slave devices. After the host device receives a response to the round-trip delay request, it determines the slave device corresponding to the response.

[0042] Step S7: The host device receives the location of the network node in its round-trip time (RTT) time slot, and sends the location of all the network nodes to each of the slave devices in the host device's downlink time slot, so that the host device and each of the slave devices achieve optimal beam alignment. After the host device and the multiple slave devices complete the optimal beam alignment, they perform service communication according to the time slot table.

[0043] refer to Figure 1 As shown, the number of wave positions is set to N, and the pseudo-random sequence period is set to T. Figure 1It represents the transceiver status of the master device and slave devices for the first pseudo-random sequence. Since it is burst communication, in this embodiment, the master device transmits two consecutive rounds of wave positions to ensure that each slave device can receive a complete round of wave position values. Additionally, the first pseudo-random sequence is also transmitted twice under each wave position to ensure that the receiving end can complete the relevant operations for the entire cycle. When the master device transmits at a certain wave position, all slave devices are in the receiving state and poll all wave positions. Then, the master device switches the wave position every 2NT time, and the slave device switches the wave position every 2T time. Then, the optimal wave position number of the slave device is determined by the capture peak of the pseudo-random sequence.

[0044] Reference Figure 2 As shown, it is the transceiver status of the master device and multiple slave devices for the second pseudo-random sequence. Since when receiving the first pseudo-random sequence, the slave device can find the optimal wave position number by finding the maximum peak, when receiving the second pseudo-random sequence, the slave device always uses the optimal wave position number to receive. The information sent by the master device includes the position information and time slot number of the master device for rough synchronization.

[0045] Reference Figure 3 As shown, it is the transceiver status of the master device and multiple slave devices for the third pseudo-random sequence. When receiving the second pseudo-random sequence, the slave device has obtained the position information of the master device. Each slave device sends the third pseudo-random sequence, and the master device polls all wave positions. The master device switches the wave position every 2T time, and then determines the optimal wave position number of the master device by the capture peak of the pseudo-random sequence.

[0046] Reference Figure 4 It is a schematic diagram of the entire time slot structure when there are 12 nodes (including one master device and 11 slave devices).

[0047] Specifically, in this embodiment, both the master device and multiple slave devices include a phased array antenna and a communication control single machine. The phased array antenna consists of 16 array elements, distributed in 4 rows and 4 columns. The signals received by each array element antenna are amplified, down-converted, filtered, etc., and converted into intermediate frequency signals, and then digitized and sampled through an ADC and enter the FPGA for processing. The beam width of the 4×4 phased array is about 20 degrees. Therefore, taking 20 degrees as an airspace scanning interval, the entire airspace covered by the phased array is scanned, that is, the rotation angle is from 0° to 360°, and the off-axis angle is from 0° to 60°, a total of 18×3 = 54 airspace scanning intervals. So, the number of wave position values N not less than 54 can cover all angles. In this embodiment, the number of wave positions adopted is 69, and the pseudo-random sequence period is 81.92 us.

[0048] Since the reception and transmission of the host device and the plurality of slave devices are not simultaneous, in order to ensure that all wave position values ​​are traversed, the host device needs to continuously send two rounds of the first pseudo-random sequence signal, and in order to ensure the alignment of the pseudo-random sequence, the pseudo-random sequence is also continuously sent twice, and when the host transmits at a certain wave position, the slave device polls all wave positions once, then the time for the host device to send the first pseudo-random sequence is 69*69*2*81.92*2=1560.08448ms, the slave device records the capture peak value of the pseudo-random sequence under each wave position, and then finds the maximum value among all the peak values ​​and records the current wave position value, at this time, each of the slave devices can determine the position of the maximum beam of the host device. Then the host device sends the information that the capture header is the second pseudo-random sequence, and since the slave device has obtained the position of the maximum beam of the host device, the slave device only needs to receive at a fixed wave position, then the time for the host device to send the second pseudo-random sequence is 69*1.6=110.4ms, and the role of the second pseudo-random sequence is that the host device sends the position information and time slot number of the host device to the slave device.

[0049] The slave device sends information with a capture header of the third pseudo-random sequence to the host device at a fixed wave position. The host device polls all wave positions for reception, and the time is 69*2*81.92=11.30496ms. After searching for the frame header of the third pseudo-random sequence, the host device determines the beam with the corresponding slave device, adds a 1ms path delay, and sends an RTT request in the next time slot. After receiving the RTT response from the host device, it is set to the determined slave device for precise synchronization.

[0050] In summary, this embodiment proposes a beam alignment method for multi-node burst communication. The method determines the network nodes by setting a host device and multiple slave devices, and transmits three signal frames consisting of a pseudo-random sequence frame header with a cyclic prefix and a service data frame content in a burst form. This method is suitable for beam alignment between multiple nodes, and there is no need to configure narrow beam antennas and wide beam antennas at the same time to perform beam alignment. Only narrow beam antennas need to be set. In addition, this embodiment is suitable for burst communication, which expands the scope of application of the beam alignment method and increases the applicability of the technology.

[0051] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0052] It should be noted that the devices and methods disclosed in the embodiments of this article can also be implemented in other ways. The device implementation described above is only schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices, methods and computer program products according to multiple embodiments of this article. In this regard, each box in the flowchart or block diagram can represent a part of a module, program or code, and the module, program segment or part of the code contains one or more executable instructions for implementing the specified logical function, and the module, program segment or part of the code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart can be implemented by a dedicated hardware-based system for performing a specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions.

[0053] In addition, the functional modules in the various embodiments of this document may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

[0054] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. A beam alignment method for multi-node burst communication, It is characterized in that include: Step S1: setting a host device and multiple slave devices to determine network nodes; Step S2: using three different pseudo-random sequences to obtain three pseudo-random sequence frame headers with cyclic prefixes; Step S3: the host device uses the first pseudo-random sequence frame header among the three pseudo-random sequence frame headers to broadcast the beam to perform beam scanning; Step S4: all the slave devices receive the first pseudo-random sequence frame header broadcast by the host device, and each of the slave devices calculates the first pseudo-random sequence frame header to determine the optimal wave position value; Step S5: the host device transmits a second pseudo-random sequence frame header among the three pseudo-random sequence frame headers, and the slave device receives the second pseudo-random sequence frame header at a fixed wave position to perform coarse synchronization, and the fixed wave position is the optimal wave position value determined in step S4; Step S6: According to the time slot table, all the slave devices transmit the third pseudo-random sequence frame header to the host device in a direction in the corresponding time slot. After the host device searches for the third pseudo-random sequence frame header, it determines the slave device corresponding to the received third pseudo-random sequence frame header, obtains the position of the network node, and performs fine synchronization; Step S7: the host device receives the position of the network node in its round-trip delay time slot, and sends the position of all the network nodes to each of the slave devices in the host device's downlink time slot, so that the host device and each of the slave devices achieve optimal beam alignment.

2. The beam alignment method for multi-node burst communication according to claim 1, It is characterized in that In the step S2, when the host device uses the first pseudo-random sequence frame header to broadcast the beam, the beam position value transmitted by the beam and the first pseudo-random sequence corresponding to the first pseudo-random sequence frame header are sent to each of the slave devices.

3. The beam alignment method for multi-node burst communication according to claim 2, It is characterized in that In the step S2, when the host device broadcasts the beam, it polls all the beam positions of the beam for multiple times to cover all areas, ensuring that each of the slave devices receives a complete round of signals of the beam.

4. The beam alignment method for multi-node burst communication according to claim 1, It is characterized in that When the host device performs the broadcast, all the slave devices are set to a receiving state, and the slave devices poll the wave position once. The slave devices perform correlation operations through the first pseudo-random sequence frame header and obtain capture peak values ​​through threshold comparison to determine the optimal wave position value.

5. The beam alignment method for multi-node burst communication according to claim 1, It is characterized in that In the step S5, the information sent by the host device to each of the slave devices includes: the location information and time slot number of the host device, so as to perform coarse synchronization.

6. The beam alignment method for multi-node burst communication according to claim 1, It is characterized in that In the step S5, after the host device transmits the time slot of the second pseudo-random sequence frame header, a protection interval of a certain time is reserved for path delay and calculation time of the position receiving system in the host device.

7. The beam alignment method for multi-node burst communication according to claim 6, It is characterized in that The certain period of time protection interval is set to 5ms.

8. The beam alignment method for multi-node burst communication according to claim 1, It is characterized in that After searching for the third pseudo-random sequence frame header, the host device determines the beam with the corresponding slave device, adds a certain period of path delay, and sends a round-trip delay request to each of the slave devices in the next time slot. After receiving a response to the round-trip delay request, the host device determines the slave device corresponding to the response.

9. The beam alignment method for multi-node burst communication according to claim 1, It is characterized in that After the host device and the plurality of slave devices complete the optimal beam alignment, they perform service communication according to the time slot table.

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