CN107359922A - A kind of beam scanning is the same as the DOA neighbours' discoveries being combined and accuracy alignment method - Google Patents
A kind of beam scanning is the same as the DOA neighbours' discoveries being combined and accuracy alignment method Download PDFInfo
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- CN107359922A CN107359922A CN201710497885.4A CN201710497885A CN107359922A CN 107359922 A CN107359922 A CN 107359922A CN 201710497885 A CN201710497885 A CN 201710497885A CN 107359922 A CN107359922 A CN 107359922A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/086—Weighted combining using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming
Abstract
The invention discloses a kind of beam scanning with the DOA neighbours' discoveries being combined and alignment scheme, the neighbours that it is related in microwave phased antenna systems non-stop layer networking find and beam alignment.Each node switches first with antenna in the program and fixed beam figuration realizes that thick beam scanning and neighbours have found, then further realizes that accurate wave beam is aligned using DOA estimations and digital beam forming.This scheme can be applied in microwave non-stop layer constructing communication network, solve neighbours' discovery and accurate wave beam alignment issues, effectively reduce hardware and software algorithm complexity, disclosure satisfy that the demand of vehicle-mounted, carrier-borne and unloaded microwave equipment multinode non-stop layer networking.
Description
Technical field
The present invention relates to a kind of beam scanning with the DOA neighbours' discoveries being combined and alignment scheme, each node can be realized
The more neighbours of omnidirectional have found accurately to be aligned with wave beam, are applicable non-stop layer multinode networking, disclosure satisfy that vehicle-mounted, carrier-borne and unloaded microwave
Equipment communication and the needs of networking.
Background technology
In vehicle-mounted, carrier-borne and unloaded microwave communication, in order to meet the requirement of multinode networking, it is necessary to its phased antenna system
System can realize that 360 ° of high-precision neighbours have found to be aligned with wave beam.Neighbours common at present have found to be aligned mainly have with wave beam：1)
DOA algorithm for estimating, using multichannel T/R component reception signals, base band using DOA algorithm for estimating carry out neighbours find with it is adaptive
Answer wave beam forming；2) antenna switching scheme, switch using to antenna beam, realize the scanning and switching of wave beam.But DOA estimates
Algorithm needs substantial amounts of radio-frequency channel, and equipment complexity and cost are higher；Antenna switching scheme precision is intersected, and wave beam crosspoint
Gain is relatively low, it is impossible to meets the requirement of high-precision wave beam alignment.With the continuous development of networking microwave, it is badly in need of a kind of cost
The neighbours low, precision is high find and wave beam alignment scheme, meet the requirement of microwave communication networking.
The content of the invention
It is an object of the invention to avoid above-mentioned background technology from applying the weak point in directional communication, and provide one
The high-precision neighbours of kind low complex degree find and alignment scheme.The program switches antenna first with switch, forms multiple wave beams
Omnidirectional is scanned, wave beam, which is aligned, between node realizes that neighbours have found that then each node is entered using multiple antennas corresponding to wave beam
Row DOA estimates, realizes the accurate alignment of wave beam.
The technical solution adopted for the present invention to solve the technical problems is：
A kind of beam scanning comprises the following steps with the DOA neighbours' discoveries being combined and accurate alignment scheme：
(1) after each node time synchronization, the N channel baseband processing component control M of transmitting node selects N switch modules at M
Adjacent N number of plane directional aerial is selected to form an antenna element in plane directional aerial；Wherein, M is oneself more than or equal to 6
So number, N are the natural number less than or equal to M/2；
(2) transmitting node finds frame in MAC layer generation neighbours and incoming N channel baseband processing unit is modulated and launched
Thick wave beam forming, up-conversion is carried out by N channel radio frequency component, launched by the antenna element of selection；
(3) the N channel baseband processing component control of receiving node selects N components to control M to select N switch modules flat at M by M
Adjacent N number of plane directional aerial is selected to form an antenna element in the directional aerial of face；
(4) receiving node receives neighbours by the antenna element of selection and finds frame, if receiving neighbours finds frame, through N
Channel radio frequency component carries out down coversion, carries out receiving thick wave beam forming and demodulation by N channel baseband processing unit, is passed to and receives
Node M AC layers, and send and reply message to transmitting node；Otherwise return to step (1)；
(5) transmitting node, which receives, replies message laggard traveling wave beam alignment；
(6) determine that transmitting node and receiving node participate in N number of antenna of work and carry out time slot respectively after wave beam alignment
Reservation, the neighbours completed between node have found；
(7) transmitting node is by participating in N number of antenna transmission signal of work；
(8) receiving node receives the signal of transmitting node by participating in N number of antenna of work, and phase excitation is carried out to signal
Linear array is equivalent to, and carries out DOA estimations, realizes useful signal and the direction estimation of interference signal, according to direction estimation to transmitting
Node carries out wave beam and is accurately aligned, and carries out null ripple to interference signal.
Wherein, in step (1) and step (3) transmitting node and receiving node selected in M plane directional aerial it is adjacent
N number of plane directional aerial form an antenna element, selected according to the scanning direction of setting, and transmitting node and reception
The scanning direction of node is consistent, but the different scanning cycle uses different starting points.
Wherein, each antenna element forms one or more thick wave beams, and a time slot only has 1 thick wave beam and is operated, respectively
Wave beam according to sequentially realizing 360 ° of scannings clockwise or counterclockwise.
The present invention has the following advantages that compared with background technology：
1. the present invention, compared with beam switchover scheme, each node can obtain the incoming wave angle estimation of higher precision, so as to
Wave beam maximum gain can be directed at communication node, and avoid in beam switchover scheme that wave beam crosspoint antenna gain is too low to ask
Topic.
2. on the one hand the present invention employs less radio-frequency channel compared with omnidirectional DOA estimates, system hardware reality is reduced
Existing complexity, so as to reduce cost；On the other hand reduce process signal dimension, reduce computational complexity.
Brief description of the drawings
Fig. 1 is that the neighbours of the present invention have found to be directed at schematic diagram with wave beam.
Fig. 2 is the node device composition frame chart of the present invention.
Embodiment
The present invention is described in further details below in conjunction with the accompanying drawings：
Fig. 1 shows the neighbor discovery process of the present invention by taking M=8 as an example, and whole neighbours have found to be divided into two steps.First
Step, beam scanning alignment, after each node time synchronization, A% probability transmission signal, (100-A) % are used in identical time slot
Probability reception signal；Wave beam is controlled to carry out 360 ° of scannings, transmitting-receiving node is scanned according to different scan patterns, embodiment
Each node is launched according to 30% probability, and 70% probability receives, and node 1 is transmitting node, and node 2 is receiving node, scanning
Wave beam coarse alignment and interactive information after for several times, realize that neighbours have found, determine work antenna.Second step, DOA estimations, each node profit
Useful signal is carried out with user oriented N (N=3) individual antenna and interference signal direction is accurately estimated, DOA estimated accuracies≤
1°。
Each node physical layer that Fig. 2 is the present invention forms, including N channel baseband processing component 1, N channel radio frequency component 2, M
The aerial array 4 of N switch modules 3 and M (M=8) array element compositions is selected to form.Example carries out line according to Fig. 2, and wherein solid line is
Transmission signal, dotted line are control signal.
Wherein, N channel baseband processing component is responsible for DOA estimations and wave beam forming, and M can be controlled to select N switch modules to select
Corresponding work antenna, DOA estimations can be carried out, and wave beam forming is carried out to transmitting and reception signal；N channel radio frequency component is born
Blame power amplification and the low noise amplification of N roads reception signal of N roads transmission signal；M selects N switch modules can be according to control information
N number of (N=3) antenna is selected from M antenna to be used for signal transmitting and receive, and rear end radio-frequency channel quantity is reduced, so as to reduce
System complexity, reduce cost；Aerial array is M faces battle array, N/M*180 ° of wave cover can be realized per face directional aerial, often
Coverage of the individual direction in N faces (N=3) antenna.
Wherein, its each node selects N (N=3) switch selection components to may be selected towards N number of day of all directions using M (M=8)
Line, multiple thick 360 ° of wave covers can be formed with reference to wave beam forming；N number of adjacent antenna can form 1 thick wave beam；One time slot is only
There is 1 wave beam to be operated, 360 ° of scannings can be achieved according to clockwise or plan clocking sequence in each wave beam.
Wherein, after wave beam coarse alignment, the signal that N channel baseband processing component can receive to respective antenna carries out phase
Excitation is equivalent to linear array, can carry out DOA estimations with reference to MUSIC, ESPRIT scheduling algorithm, and carry out transmission signal up to information according to ripple
With the accurate wave beam forming of reception signal and the null ripple of interference signal.Comprise the following steps that：
(1) after each node time synchronization, the N channel baseband processing component control M of transmitting node selects N switch modules at M
Adjacent N number of plane directional aerial is selected to form an antenna element in plane directional aerial；Wherein, M is oneself more than or equal to 6
So number, N are the natural number less than or equal to M/2；
(2) transmitting node finds frame in MAC layer generation neighbours and incoming N channel baseband processing unit is modulated and launched
Thick wave beam forming, up-conversion is carried out by N channel radio frequency component, launched by the antenna element of selection；
(3) the N channel baseband processing component control of receiving node selects N components to control M to select N switch modules flat at M by M
Adjacent N number of plane directional aerial is selected to form an antenna element in the directional aerial of face；
(4) receiving node receives neighbours by the antenna element of selection and finds frame, if receiving neighbours finds frame, through N
Channel radio frequency component carries out down coversion, carries out receiving thick wave beam forming and demodulation by N channel baseband processing unit, is passed to and receives
Node M AC layers, and send and reply message to transmitting node；Otherwise return to step (1)；
(5) transmitting node, which receives, replies message laggard traveling wave beam alignment；
(6) determine that transmitting node and receiving node participate in N number of antenna of work respectively after wave beam alignment, complete between node
Neighbours find；
(7) transmitting node is by participating in N number of antenna transmission signal of work；
(8) receiving node receives the signal of transmitting node by participating in N number of antenna of work, and phase excitation is carried out to signal
Be equivalent to linear array, and and combine MUSIC, ESPRIT scheduling algorithm and carry out DOA estimations, realize the direction of useful signal and interference signal
Estimation, wave beam is carried out to transmitting node according to direction estimation and is accurately aligned, and null ripple is carried out to interference signal.
Operation principle：Each node is launched and received with certain probability, switches antenna using switch, and order figuration M is thick
Wave beam, it is scanned according to scanning pattern, realizes the wave beam coarse alignment of each adjacent node；Each node is selected towards phase after coarse alignment
The antenna of neighbors, DOA estimations are carried out using MUSIC algorithms or other DOA algorithms, realize that each node is useful and interference signal
Direction estimation；According to direction estimation information, wave beam is carried out to neighbours and is accurately aligned, and null ripple is carried out to interference.
Claims (3)
1. a kind of beam scanning is the same as the DOA neighbours' discoveries being combined and accuracy alignment method, it is characterised in that including following step
Suddenly：
(1) after each node time synchronization, the N channel baseband processing component control M of transmitting node selects N switch modules in M plane
Adjacent N number of plane directional aerial is selected to form an antenna element in directional aerial；Wherein, M is the nature more than or equal to 6
Number, N are the natural number less than or equal to M/2；
(2) transmitting node finds frame in MAC layer generation neighbours and incoming N channel baseband processing unit is modulated and launched thick ripple
Beam figuration, up-conversion is carried out by N channel radio frequency component, launched by the antenna element of selection；
(3) the N channel baseband processing component control of receiving node selects N components to control M to select N switch modules to determine in M plane by M
Adjacent N number of plane directional aerial is selected to form an antenna element into antenna；
(4) receiving node receives neighbours by the antenna element of selection and finds frame, if receiving neighbours finds frame, through N channel
Radio frequency component carries out down coversion, carries out receiving thick wave beam forming and demodulation by N channel baseband processing unit, is passed to receiving node
MAC layer, and send and reply message to transmitting node；Otherwise return to step (1)；
(5) transmitting node, which receives, replies message laggard traveling wave beam alignment；
(6) determine that transmitting node and receiving node participate in N number of antenna of work and carry out time slot reservation respectively after wave beam alignment,
The neighbours completed between node have found；
(7) transmitting node is by participating in N number of antenna transmission signal of work；
(8) receiving node receives the signal of transmitting node by participating in N number of antenna of work, and it is equivalent to carry out phase excitation to signal
For linear array, and DOA estimations are carried out, useful signal and the direction estimation of interference signal are realized, according to direction estimation to transmitting node
Carry out wave beam to be accurately aligned, and null ripple is carried out to interference signal；
Complete beam scanning and found with the neighbours that DOA is combined with being accurately aligned.
2. with the DOA neighbours' discoveries being combined and accuracy alignment method, it is special for a kind of beam scanning according to claim 1
Sign is, transmitting node and receiving node select adjacent N number of flat in M plane directional aerial in step (1) and step (3)
Face directional aerial forms an antenna element, is selected according to the scanning direction of setting, and transmitting node and receiving node
Scanning direction is consistent, but the different scanning cycle uses different starting points.
3. with the DOA neighbours' discoveries being combined and accuracy alignment method, it is special for a kind of beam scanning according to claim 2
Sign is that each antenna element forms one or more thick wave beams, and a time slot only has 1 thick wave beam and is operated, each thick ripple
Beam according to sequentially realizing 360 ° of scannings clockwise or counterclockwise.
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| CN110149126A (en) * | 2019-05-24 | 2019-08-20 | 熊军 | A kind of beam form-endowing method and beam size enlargement apparatus of 3D-MIMO system |
| CN115334489A (en) * | 2022-10-13 | 2022-11-11 | 天地信息网络研究院(安徽)有限公司 | High mobility platform ad hoc network neighbor discovery method based on panoramic beams |
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