CN110518941A - A kind of car networking distributed diversity sending method unenhanced based on wave beam - Google Patents
A kind of car networking distributed diversity sending method unenhanced based on wave beam Download PDFInfo
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- CN110518941A CN110518941A CN201910864951.6A CN201910864951A CN110518941A CN 110518941 A CN110518941 A CN 110518941A CN 201910864951 A CN201910864951 A CN 201910864951A CN 110518941 A CN110518941 A CN 110518941A
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- wave beam
- unenhanced
- car
- car networking
- sending method
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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
- H04B7/0408—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
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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
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/165—Performing reselection for specific purposes for reducing network power consumption
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0035—Synchronisation arrangements detecting errors in frequency or phase
Abstract
A kind of car networking distributed diversity sending method unenhanced based on wave beam, the specific steps of which are as follows: (1) system initialization, calculates the unenhanced granularity α π/N of wave beam according to the quantity N of transmitting terminal antenna, wherein α is the proportion adjustment factor；(2) the unenhanced figuration deflection set θ of wave beam is calculatedk=k α π/N,(3) transmitting terminal is reported according to each car-mounted terminal translational speed information and moving direction information calculate the Doppler compensation factors of each wave beamWhereinFor k-th of wave beam Doppler compensation factors, v is car-mounted terminal movement speed, fcFor carrier frequency, θkFor k-th of wave beam forming deflection,For car-mounted terminal movement direction angle；(4) during k-th of wave beam is unenhanced, Doppler's pre-distortion is carried out to transmission signal firstWherein x (t) is the baseband signal to be sent, then by way of wave beam forming by signal sk(t) it is sent by mutiple antennas.
Description
Technical field
The invention belongs to technical field of information processing in car networking system in terms of mobile communication, are related to a kind of flat based on wave beam
The car networking distributed diversity sending method swept.
Background technique
With comprehensive commercialization of 5G, the research and development of B5G/6G key technology and standard promote agenda.B5G/6G system will
Using higher carrier frequency, smaller cell radius and more dense networking mode.Due to the problem of using high band, causing
It include: more serious Doppler effect and higher path loss.In order to overcome the path loss of high band, mobile communication system is usual
Increase covering by the way of wave beam forming.For 5G includes B5G/6G system, car networking is its most important application
One of scene.And more serious Doppler effect caused by high band, smaller radius of society cause switching more frequently and
It includes that B5G/6G system is applied to urgent need to resolve in car networking scene that the high mobility of vehicle, which is 5G, in wave beam forming and car networking
One of the problem of.
Specifically, at present system schema the problem of it is as follows:
1, higher carrier frequency leads to more serious Doppler effect.The size and carrier frequency of Doppler frequency shift are at just
Than.Since low-frequency range frequency spectrum resource is more nervous and improves the demand of system transmission bandwidth, B5G and 6G system will use opposite
In the higher frequency range of 4G system, this will cause receiving end signal to generate more serious Doppler frequency shift.Maximum Doppler frequency shift pair
The performance of the Timing Synchronization of receiver, channel estimation and symbol detection can all cause very serious influence.Receiver presses down at present
Doppler shift influence processed generallys use automatic frequency calibration unit to carry out.It, which mainly passes through, receives the training that transmitting terminal is sent
Sequence is estimated the frequency shift (FS) of receiving end local signal and is compensated.Then under high band B5G/6G car networking environment,
The size of Doppler shift may be more than the maximum estimated range of frequency excursion algorithm, and under microcellulor overlay environment,
The size of Doppler frequency shift is quick time-varying.This will cause the estimation of receiving end automatic frequency calibration unit and tracking is difficult, and
Seriously affect the reliability of car networking link.
2, higher carrier frequency causes higher path loss and single station coverage area to become smaller.It is well known that electromagnetism
The propagation loss of wave is related with its frequency, and frequency is higher, and electromagnetic wave propagation loss is higher, leads to the coverage area singly stood reduction.
In car networking environment, lesser single station coverage area will lead to vehicle and cell reselection continually occur in the process of moving and cuts
It changes, to seriously reduce the reliability of communication link.More RRU (Remote Radio Unit, Radio Remote usually can be used
Unit the mode of the same logic district) is constituted to reduce the cell reselection in vehicle travel process and the probability of switching, still
There is still a need for carry out frequent RRU unit switching.Moreover, the link-quality in single RRU covering edge customer can also deteriorate.
3, wave cover causes position tracking expense to increase under vehicle net environment.It is covered under high band in order to solve single station
The problem of lid, increases the covering of signal in 5G system in such a way that directional wave beam emits signal.However in car networking ring
Under border, due to the high mobility of vehicle, so that base station needs to track in time when sending signal the current shift position of vehicle, this
Also it is affected to the reliability of system.
Summary of the invention
The present invention provides a kind of link reliabilities that can be improved under high band car networking environment, inhibit large doppler frequency
Inclined influence, and reduce the car networking distributed diversity sending method unenhanced based on wave beam of the frequency of RRU switching.
The technical solution adopted by the present invention is that:
A kind of car networking distributed diversity sending method unenhanced based on wave beam, the specific steps of which are as follows:
(1) system initialization calculates the unenhanced granularity α π/N of wave beam according to the quantity N of transmitting terminal antenna, and wherein α is ratio
Regulatory factor；
(2) the unenhanced figuration deflection set θ of wave beam is calculatedk=k α π/N,(3) transmitting terminal is according to each
Translational speed information and moving direction information that car-mounted terminal reports calculate the Doppler compensation factors of each wave beamWhereinFor k-th of wave beam Doppler compensation factors, v is car-mounted terminal movement speed, fcTo carry
Wave frequency rate, θkFor k-th of wave beam forming deflection,For car-mounted terminal movement direction angle；
(4) during k-th of wave beam is unenhanced, Doppler's pre-distortion is carried out to transmission signal firstX (t) is the baseband signal to be sent, then by way of wave beam forming by signal sk(t) pass through
Mutiple antennas is sent.
Further, the value of proportion adjustment factor-alpha can be obtained according to following calculate in step (1):Wherein
TsFor the frame length for sending frame, TpFor the period for sending frame.
Further, the car-mounted terminal movement direction angle in step (3)The Doppler compensation factors are reduced toBecause vehicle can only be moved in the process of moving along road direction, road direction is set to
Angle reference direction, then
Further, beamformed signals in step (4) are as follows:
φ is angle of the ULA aerial array normal direction with road direction in formula.
Further, the signal transmission process in step (4) are as follows: each moment belongs to multiple RRU of the same logic district
Select identical wave beam forming direction θkSynchronous to send beamformed signals, each sending duration is Ts。
Further, after the signal in step (4) is sent, synchronism switching to next figuration direction θk+1It is subsynchronous again
Send beamformed signals, sending duration Ts, so circulation is gone down, whenWhen, by k zero setting, and start under transmission
One new data.
Beneficial effects of the present invention: using the multiple RRU for belonging to the same logic district while identical assigned direction is sent
Wave beam pre- Doppler's distortion processing is carried out to the signal of transmission and according to the velocity information combination beam direction of each vehicle,
The link reliability under high band car networking environment can be improved, inhibit the influence of large doppler frequency deviation, and reduce RRU switching
Frequency.
Detailed description of the invention
Fig. 1 is flow chart of the invention.
Specific embodiment
Next combined with specific embodiments below invention is further explained, but does not limit the invention to these tools
Body embodiment.One skilled in the art would recognize that present invention encompasses may include in Claims scope
All alternatives, improvement project and equivalent scheme.
Present embodiments provide a kind of car networking distributed diversity sending method unenhanced based on wave beam comprising:
(1) system initialization calculates the unenhanced granularity α π/N of wave beam according to the quantity N of transmitting terminal antenna, and wherein α is ratio
Regulatory factor, value can be obtained according to following calculate:Wherein TsFor the frame length for sending frame, TpTo send frame
Period；
(2) the unenhanced figuration deflection set θ of wave beam is calculatedk=k α π/N,
(3) translational speed information and moving direction information that transmitting terminal is reported according to each car-mounted terminal calculate each wave beam
Doppler compensation factorsWhereinFor k-th of wave beam Doppler compensation factors, v is car-mounted terminal
Movement speed, fcFor carrier frequency, θkFor k-th of wave beam forming deflection,For car-mounted terminal movement direction angle；Because of vehicle
It can only be moved in the process of moving along road direction, therefore road direction is set to angle reference direction by us, thenDoppler compensation factors are reduced to
(4) during k-th of wave beam is unenhanced, Doppler's pre-distortion is carried out to transmission signal firstThen by way of wave beam forming by signal sk(t) it is sent by mutiple antennas.With ULA
Clear signal beamforming process for for (equidistant linear array) antenna:
φ is angle of the ULA aerial array normal direction with road direction in formula.Signal is in transmission process, Mei Geshi
It carves, the multiple RRU for belonging to the same logic district select identical wave beam forming direction θkIt is synchronous to send beamformed signals, often
Secondary sending duration is Ts.After transmission, synchronism switching to next figuration direction θk+1It is synchronous again to send wave beam forming
Signal, sending duration Ts, so circulation is gone down.WhenWhen, by k zero setting, and start to send next new number
According to.
It is specific to walk based on the car networking distributed diversity sending method that wave beam is unenhanced described in the present embodiment referring to Fig. 1
It is rapid as follows:
Step (1) system initialization calculates the unenhanced granularity α π/N of wave beam according to the quantity N of transmitting terminal antenna；
Step (2) calculates the unenhanced figuration deflection set θ of wave beamk=k α π/N,
Step (3) initializes wave beam forming index value k=0；
Step (4) car-mounted terminal reports translational speed information and moving direction information to transmitting terminal；
Step (5) calculates the corresponding general Le compensation factor of current beam figuration index value k
Step (6) carries out Doppler's pre-distortion corresponding with current beam figuration index value k to signal is sent
Step (7) generates current beam figuration index value k and corresponds to beamformed signals:
Multiple RRU of step (8) same logic district are synchronous to send beamformed signals yk(t)；
Step (9) wave beam forming index value k adds 1；
Step (10) judges wave beam forming index valueIt is whether true, (3) are then gone to step in this way, are such as otherwise gone to step
(5)。
The movement speed and moving direction information reported the present invention is based on vehicle, using the unenhanced mode of wave beam to transmission signal
Doppler's pre-distortion is carried out, for improving the reliability of link under high band car networking environment.
Claims (6)
1. a kind of car networking distributed diversity sending method unenhanced based on wave beam, the specific steps of which are as follows:
(1) system initialization calculates the unenhanced granularity α π/N of wave beam according to the quantity N of transmitting terminal antenna, and wherein α is proportion adjustment
The factor；
(2) the unenhanced figuration deflection set θ of wave beam is calculatedk=k α π/N,
(3) translational speed information and moving direction information that transmitting terminal is reported according to each car-mounted terminal calculate the more of each wave beam
General Le compensation factorWhereinFor k-th of wave beam Doppler compensation factors, v is car-mounted terminal movement
Speed, fcFor carrier frequency, θkFor k-th of wave beam forming deflection,For car-mounted terminal movement direction angle；
(4) during k-th of wave beam is unenhanced, Doppler's pre-distortion is carried out to transmission signal first
Wherein x (t) is the baseband signal to be sent, then by way of wave beam forming by signal sk(t) it is sent out by mutiple antennas
It sees off.
2. a kind of car networking distributed diversity sending method unenhanced based on wave beam as described in claim 1, it is characterised in that:
The value of proportion adjustment factor-alpha can be obtained according to following calculate in step (1):Wherein TsFor the frame for sending frame
It is long, TpFor the period for sending frame.
3. a kind of car networking distributed diversity sending method unenhanced based on wave beam as described in claim 1, it is characterised in that:
Car-mounted terminal movement direction angle in step (3)The Doppler compensation factors are reduced to
4. a kind of car networking distributed diversity sending method unenhanced based on wave beam as described in claims 1 to 3 any one,
It is characterized by: beamformed signals in step (4) are as follows:
φ is angle of the ULA aerial array normal direction with road direction in formula.
5. a kind of car networking distributed diversity sending method unenhanced based on wave beam as claimed in claim 4, it is characterised in that:
Signal transmission process in step (4) are as follows: each moment, the multiple RRU for belonging to the same logic district select identical wave beam
Figuration direction θkSynchronous to send beamformed signals, each sending duration is Ts。
6. a kind of car networking distributed diversity sending method unenhanced based on wave beam as claimed in claim 5, it is characterised in that:
After signal in step (4) is sent, synchronism switching to next figuration direction θk+1It is synchronous again to send wave beam forming letter
Number, sending duration Ts, so circulation is gone down, whenWhen, by k zero setting, and start to send next new data.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910864951.6A CN110518941A (en) | 2019-09-12 | 2019-09-12 | A kind of car networking distributed diversity sending method unenhanced based on wave beam |
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| CN201910864951.6A CN110518941A (en) | 2019-09-12 | 2019-09-12 | A kind of car networking distributed diversity sending method unenhanced based on wave beam |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113438003A (en) * | 2021-06-08 | 2021-09-24 | 杭州电子科技大学 | Doppler diversity receiving method and device based on matched filtering |
| CN113543017A (en) * | 2021-06-02 | 2021-10-22 | 北京邮电大学 | Wave beam switching method of millimeter wave internet of vehicles and related equipment |
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| CN103493560A (en) * | 2011-04-27 | 2014-01-01 | 夏普株式会社 | Communication system, mobile station device, base station device, communication method, and integrated circuit |
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| CN113543017A (en) * | 2021-06-02 | 2021-10-22 | 北京邮电大学 | Wave beam switching method of millimeter wave internet of vehicles and related equipment |
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Application publication date: 20191129 |
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