CN109120315A - Self-adaptive reduced-dimensions method based on Beam Domain channel matrix under mobile context - Google Patents
Self-adaptive reduced-dimensions method based on Beam Domain channel matrix under mobile context Download PDFInfo
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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
- H04B7/0413—MIMO systems
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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
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
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Abstract
The present invention provides a kind of self-adaptive reduced-dimensions methods based on Beam Domain channel matrix under mobile context, first according to initial channel status information, carve distribute wave beam to movement station at the beginning；According to the variation and the relationship of time of the speed of movement station and direction calculating departure angle AoD, then in movement station moving process, judge departure angle changing value whether more than a wave beam coverage area until adjust to required variation, precoding finally is done to the channel matrix after dimensionality reduction.The beneficial effects of the present invention are embodied in: after carrying out beam allocation to movement station, complete the dimensionality reduction of Beam Domain channel, the Beam Domain channel matrix tieed up entirely can use the equivalent replacement of Beam Domain channel matrix of dimensionality reduction, at this time, its dimension is much smaller than the channel matrix tieed up entirely, therefore the complexity of precoding calculating can be effectively reduced when doing matrix multiple and inversion calculation.
Description
Technical field
The invention belongs to wireless communication technology fields, and in particular to a kind of based on Beam Domain channel matrix under mobile context
Self-adaptive reduced-dimensions method.
Background technique
Multiple antennas is sent and multiple antennas reception (Input Multiple Output, MIMO) is mobile communication long term evolution
A key technology in (Long Term Evolution, LTE) system.With the growth of mobile data services amount, base station side
Extensive MIMO (massive MIMO, the abbreviation M-MIMO) system for configuring a large amount of antennas becomes next generation mobile communication system
The key technology of (5G).The antenna amount of extensive mimo system is very big, and the computation complexity in communication system is got higher, therefore,
How to reduce M-MIMO system-computed complexity to have become for research hotspot, wherein Beam Domain space division multiple access (beam division
Multiple access, BDMA) technology is wherein an example.Traditional physical channel matrix is carried out feature decomposition by BDMA technology
Beam Domain channel matrix is obtained, a vector represents a wave beam in wave beam domain matrix and each wave beam is irrelevant, and one
The Beam Domain channel gain of user is relatively centrally distributed on several wave beams, therefore can be distributed different user and not weighed mutually
Folded wave beam, to be decomposed into multiple single user channels for multiuser MIMO channel is equivalent.At this point, channel dimensions are substantially dropped
It is low, so that the computation complexity (such as channel estimation, signal precoding etc.) in system is effectively reduced.
It finds by prior art documents, Chen Sun et al. is in " IEEE Transactions on
Communications, June 2015, pp.2170-2184 (institute of electrical and electronic engineers communications field periodical, 2015 6
Month, the 2170-2184 pages) " on article " the Beam Division Multiple Access Transmission for that delivers
Massive MIMO Communications (the Beam Domain space division multiple access in extensive MIMO communication system) ", they mention for the first time
Go out the concept of Beam Domain, and proposes the optimal transmission scheme of downlink；Meanwhile devising user's scheduling of downlink
Method proposes the Multiple Access scheme of BDMA.Separately find that Xiaochen Xia et al. is in " IEEE Transactions through retrieval
On Vehicular Technology, October 2017, pp.8845-8862 (institute of electrical and electronic engineers vehicle technology
Communications field periodical, in October, 2017, the 8845-8862 pages) " on article " the Beam-Domain Full-Duplex that delivers
Massive MIMO:Realizing Co-Time Co-Frequency Uplink and Downlink Transmission
In the Cellular System (the extensive MIMO of Beam Domain full duplex: is realized in cellular system with the synchronic uplink of frequency under
Row transmission) ".By Beam Domain channel matrix, the full duplex transmission scheme in extensive mimo system is proposed.But above-mentioned two
Text is all to consider static scene, the lesser situation of the time variation of channel.In the research of Beam Domain channel, to mobile context channel
Analysis rare refer to.
Summary of the invention
In order to solve the deficiencies in the prior art, the present invention provides a kind of based on Beam Domain channel matrix under mobile context
Self-adaptive reduced-dimensions method.
The purpose of the present invention is achieved through the following technical solutions:
Based on the self-adaptive reduced-dimensions method of Beam Domain channel matrix under mobile context, include the following steps:
S1, according to initial channel status information, carve at the beginning to movement station distribute wave beam；
S2, according to the variation and the relationship of time of the speed of movement station and direction calculating departure angle AoD: in wave beam for the first time point
With later, its movement speed and direction are fed back to base station by movement station, and base station end is believed according to the position and movement state of movement station
Breath calculates the variation of AoD t at any time, calculation formula are as follows:
Wherein, d0Indicate the initial distance between movement station and base station, dtIndicate between t moment movement station and base station away from
From v and θMSThe movement speed and angle of movement station are respectively indicated,For the AoD of initial time.
S3, in movement station moving process, judge departure angle changing value whether more than a wave beam coverage area, if
It is more than to return to previous step after then carrying out the adjustment of beam collection, if not exceeded, then carrying out in next step；
S4, channel tracking is carried out in primary beam collection；
S5, precoding is done to the channel matrix after dimensionality reduction.
Preferably, movement station distribution wave beam includes the following steps: in the S1
S11, the channel matrix for obtaining Beam Domain: progress channel is carved at the beginning and is estimated, channel matrix is obtained；
S12, the channel matrix that will acquire carry out feature decomposition and obtain the channel matrix of Beam Domain, in the downlink, square
Each column of battle array represent a wave beam；
S13, to movement station distribute initial beam, obtain the channel gain on each wave beam, by gain it is biggish several
Beam allocation completes the dimensionality reduction of Beam Domain channel to movement station.
Preferably, deterministic process includes the following steps: in the S3
S31, the variation of AoD is obtained in t moment by the formula in S2Afterwards, its value is analyzed, due to
The corresponding direction of each wave beam in Beam Domain withIt is corresponding, define the beam resolution of Beam Domain channel matrix are as follows:
JudgementValue:
If the variation of △ s <b, AoD are not above beam resolution, the wave beam that last moment distributes movement station at this time
Collection still contains most of gain in channel, therefore does not need to be adjusted the beam collection that movement station occupies, and should continue
The calculating of subsequent time AoD, and step 3 is repeated to judge whether to need to be adjusted wave beam according to AoD value；
If △ s >=b, illustrates that the variation of AoD has been more than beam resolution, needs to be adjusted the beam collection of movement station,
Enable selected wave beam according to the moving direction of movement station successively along shifting, it is ensured that the beam collection to movement station distribution includes most of
Channel gain, finally enableFor AoD value this momentStep 3 is repeated in subsequent time to sentence according to AoD value
It is disconnected whether to need to be adjusted wave beam.
Preferably, the Beam Domain precoding that signal is carried out in the S5 specifically comprises the following steps:
Base station end transmits useful signal by the beam collection after distribution, makees precoding with the channel matrix after dimensionality reduction:
WhereinFor the Beam Domain channel matrix after dimensionality reduction.
Preferably, in the S11 initial time channel matrix using initial time fixation position average channel shape
State information is obtained.
Preferably, it is then needed in this method when movement station enters another base station range from a base station range
Return redefines channel state information step, to start the dynamic beam assigning process of next round.
The beneficial effects of the present invention are embodied in: after carrying out beam allocation to movement station, that is, complete Beam Domain channel
Dimensionality reduction, the Beam Domain channel matrix tieed up entirely can use dimensionality reduction the equivalent replacement of Beam Domain channel matrix, at this point, its dimension is far small
In the channel matrix tieed up entirely, therefore the complexity of precoding calculating can be effectively reduced when doing matrix multiple and inversion calculation.
Detailed description of the invention
Fig. 1: system schematic of the invention.
Fig. 2: the geometrical relationship schematic diagram between base station BS and movement station MS of the invention.
Fig. 3: the MS Beam Domain channel gain distribution map of different moments in the embodiment of the present invention.
Fig. 4: the comparative result figure of adaptive beam distribution method and non-adaptive beam allocation method of the invention.
Fig. 5: implementation flow chart of the invention.
Specific embodiment
Present invention discloses a kind of self-adaptive reduced-dimensions methods based on Beam Domain channel matrix under mobile context, and this method can
In system applied to extensive MIMO mobile context downlink, as shown in Figure 1.The more spacious shifting of this mobile context selection
Dynamic channel scenario, in downlink the scattering volume scattering distance of signal it is shorter and at a distance from base station (BS) farther out.Base station location
Fixed, movement station (MS) is in communication process along fixed-direction uniform motion.Base station end antenna number is 64, and antenna spacing is
Half-wavelength, movement station antenna number are 8, and antenna spacing is 20 times of wavelength, and the antenna that base station and movement station carry is equal
Even linear array (uniform linear array, ULA), the initial distance of base station and movement station are 500m, initial time from
The AoD that chamfers is 90 ° of ﹣, and the movement speed of movement station is 100m/s, and moving direction angle is 45 °.
Geometrical relationship between base station and movement station is as shown in Figure 2.Using the transmission method of Beam Domain space division multiple access (BDMA)
Signal is transmitted, dimensionality reduction is carried out to channel matrix in Beam Domain, since selected beam collection includes most of gain in channel, under
In line link, base station only can send signal by the beam collection after dimensionality reduction.
S1, according to initial channel status information, carve at the beginning to MS distribute wave beam.
Firstly, obtaining the channel matrix of Beam Domain: carrying out channel estimation in start time, obtain channel matrix, then will letter
Road matrix carries out feature decomposition and obtains the channel matrix of Beam Domain, and in the downlink, each column of matrix represent a wave beam.
At this point, the position that movement station enters base station range is fixed, therefore the average channel condition information of this position can be used
(Statistical Channel State Information, Statistical CSI) obtains channel matrix.
Then, initial beam is distributed to MS: seeking the channel gain on each wave beam, take several biggish wave beams of gain point
Dispensing MS completes the dimensionality reduction of initial time Beam Domain channel.
The relationship that S2, the variation for calculating AoD change over time.
After beam allocation for the first time, its movement speed and direction are fed back to BS by MS, and then the end BS is according to the position of MS
And mobile status information, calculate the variation of AoD t at any time, calculation formula are as follows:
Wherein, d0Indicate the initial distance between MS and BS, dtIndicate the distance between t moment MS and BS, v and θMSRespectively
Indicate the movement speed and angle of MS,For the AoD of initial time.Work as d0=500m, v=100m/s,When can obtain
The variation and the relationship of time that AoD can be obtained, are used under approximate evaluation t moment, the AoD of the present position MS.
S3, the value in MS moving process according to AoD judge whether to be adjusted wave beam.
In t moment, by the variation that AoD is calculatedAfterwards, its value is analyzed, due in Beam Domain
The corresponding direction of each wave beam withIt is corresponding, define the beam resolution of Beam Domain channel matrix are as follows:
In the Beam Domain of the present embodiment, because antenna is ULA array, the distribution of AoD isDue to base
End antenna number of standing is 64, so Beam Domain channel matrix includes 64 column vectors in downlink, i.e., total wave beam number is B=
64, therefore beam resolution
In the present embodiment, AoD initial value is -90 °, and the angle of movement station moving direction is 45 °, then the AoD of t moment isJudgementValue:
If the variation of a), △ s <b, AoD are not above beam resolution, at this point, the beam collection that last moment distributes MS
Most of gain in channel is still contained, therefore does not need to be adjusted the beam collection that MS is occupied, should be continued lower a period of time
The calculating of AoD is carved, and repeats S3 step.
If b), △ s >=b, illustrate that the variation of AoD has been more than beam resolution, need to be adjusted the beam collection of MS, enables
Selected wave beam is according to the moving direction of MS successively along shifting, it is ensured that the beam collection to MS distribution includes that most channel increases
Benefit finally enablesFor AoD value this momentS3 step is repeated in subsequent time.
Specifically, as shown in figure 3, the biggish beam collection of channel gain is changed over time and gradually deviated to the left, therefore in wave
When beam adjusts, wave beam subscript (Beam Index) should successively be deviated to the left to a unit.
S4, after carrying out beam allocation to MS, the Beam Domain precoding of signal is carried out.
Make precoding with the channel matrix after dimensionality reduction:
Wherein,For the Beam Domain channel matrix after dimensionality reduction, its dimension is much smaller than the channel matrix tieed up entirely, therefore
The complexity of precoding calculating can be effectively reduced.Finally, being returned when MS enters another BS range from a BS coverage area
It returns and redefines channel state information step, to start the dynamic beam assigning process of next round.
Above in the wave beam dimension reduction method of BDMA, beam collection selected by receiving end is related with AoD, in mobile context
Under, the AoD that base station end sends signal changes at any time, but this variation is not that the time is uniform, as shown in Figure 3
The Beam Domain channel gain of different moments is distributed.The biggish beam collection of gain changes over time in figure gradually deviates to the left, above
As can be seen that less, beam collection variation starts to become faster in the subsequent period, if each for beam collection variation in time started section
Moment, which all carries out beam collection adjustment, can waste a large amount of computing resources.
Adaptive beam domain channel dimension reduction method of the present invention, by the location information and speed of base station and movement station
Information calculates the departure angle variation for deducing base station signal by geometry, and further according to the relationship of departure angle and beam collection, judgement is
The no beam collection to be distributed movement station is adjusted, obtained beam collection time adjustment.Such as MS beam collection tune in 4s before table 1
Whole result can be seen that the speed that method of the invention can change according to signal AoD, adaptively progress wave beam adjustment, and
12 wave beam adjustment are only carried out in first 4 seconds, effectively reduce calculation amount.
Table 1: MS beam collection adjusts result in preceding 4s.
On the other hand, since the position of movement station is consecutive variations, when being adjusted to beam collection, it is only necessary to
Beam collection subscript is successively deviated, the channel gain distribution for recalculating Beam Domain is no longer needed to, to further save
Computing resource.
Further to verify beneficial effects of the present invention, as shown in connection with fig. 4, adaptive beam distribution method in the present invention
Be compared with the result of non-adaptive beam allocation method, depicted in figure the maximum wave beam subscript of gain in two methods with
The variation of time, it can be seen that as a result this method is substantially coincide compared with the method that real time beam distributes.
Therefore, not only beam collection dynamically can be distributed to movement station using method of the invention, can also effectively saved
The computing resource of province's system.Finally, the channel tieed up entirely is equivalent to the Beam Domain channel of dimensionality reduction, at this time again after beam allocation
Computation complexity can be effectively reduced with the inversion calculation that this matrix does precoding.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (6)
1. the self-adaptive reduced-dimensions method based on Beam Domain channel matrix under mobile context, characterized by the following steps:
S1, according to initial channel status information, carve at the beginning to movement station distribute wave beam；
S2, according to the variation and the relationship of time of the speed of movement station and direction calculating departure angle AoD: beam allocation for the first time it
Afterwards, its movement speed and direction are fed back to base station, position and movement status information of the base station end according to movement station, meter by movement station
Calculate the variation of AoD t at any time, calculation formula are as follows:
Wherein, d0Indicate the initial distance between movement station and base station, dtIndicate the distance between t moment movement station and base station, v
And θMSThe movement speed and angle of movement station are respectively indicated,For the AoD of initial time.
S3, in movement station moving process, judge departure angle changing value whether more than a wave beam coverage area, if super
It crosses, then returns to previous step after carrying out the adjustment of beam collection, if not exceeded, then carrying out in next step；
S4, channel tracking is carried out in primary beam collection；
S5, precoding is done to the channel matrix after dimensionality reduction.
2. the self-adaptive reduced-dimensions method as described in claim 1 based on Beam Domain channel matrix under mobile context, feature exist
In: movement station distribution wave beam includes the following steps: in the S1
S11, the channel matrix for obtaining Beam Domain: progress channel is carved at the beginning and is estimated, channel matrix is obtained；
S12, the channel matrix that will acquire carry out feature decomposition and obtain the channel matrix of Beam Domain, in the downlink, matrix
Each column represent a wave beam；
S13, initial beam is distributed to movement station, the channel gain on each wave beam is obtained, by several biggish wave beams of gain
Movement station is distributed to, the dimensionality reduction of Beam Domain channel is completed.
3. the self-adaptive reduced-dimensions method as described in claim 1 based on Beam Domain channel matrix under mobile context, feature exist
In: deterministic process includes the following steps: in the S3
S31, the variation of AoD is obtained in t moment by the formula in S2Afterwards, its value is analyzed, due to wave beam
The corresponding direction of each wave beam in domain withIt is corresponding, define the beam resolution of Beam Domain channel matrix are as follows:
JudgementValue:
If the variation of △ s <b, AoD are not above beam resolution, the beam collection that last moment distributes movement station at this time is still
Most of gain in channel is contained, therefore does not need to be adjusted the beam collection that movement station occupies, should be continued next
The calculating of moment AoD, and step 3 is repeated to judge whether to need to be adjusted wave beam according to AoD value；
If △ s >=b, illustrates that the variation of AoD has been more than beam resolution, need to be adjusted the beam collection of movement station, enable institute
The wave beam of selection is according to the moving direction of movement station successively along shifting, it is ensured that the beam collection to movement station distribution includes most letter
Road gain, finally enablesFor AoD value this momentStep 3 is repeated in subsequent time to be according to the judgement of AoD value
It is no to need to be adjusted wave beam.
4. the self-adaptive reduced-dimensions method as described in claim 1 based on Beam Domain channel matrix under mobile context, feature exist
In: the Beam Domain precoding that signal is carried out in the S5 specifically comprises the following steps:
Base station end transmits useful signal by the beam collection after distribution, makees precoding with the channel matrix after dimensionality reduction:
WhereinFor the Beam Domain channel matrix after dimensionality reduction.
5. the self-adaptive reduced-dimensions method as claimed in claim 2 based on Beam Domain channel matrix under mobile context, feature exist
In: the channel matrix of initial time is obtained using the average channel condition information of the fixation position of initial time in the S11
It takes.
6. the self-adaptive reduced-dimensions method as described in claim 1 based on Beam Domain channel matrix under mobile context, feature exist
In: in this method when movement station enters another base station range from a base station range, then return is needed to redefine
Channel state information step, to start the dynamic beam assigning process of next round.
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| Publication number | Priority date | Publication date | Assignee | Title |
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