CN109167618A - The extensive MIMO down channel of FDD is rebuild and multiuser transmission method - Google Patents
The extensive MIMO down channel of FDD is rebuild and multiuser transmission method Download PDFInfo
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- CN109167618A CN109167618A CN201810728817.9A CN201810728817A CN109167618A CN 109167618 A CN109167618 A CN 109167618A CN 201810728817 A CN201810728817 A CN 201810728817A CN 109167618 A CN109167618 A CN 109167618A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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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
- H04B7/0413—MIMO systems
- H04B7/0417—Feedback 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
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
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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
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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
- H04B7/0619—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
- H04B7/0621—Feedback content
- H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
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- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
- Radio Transmission System (AREA)
Abstract
The down channel that the invention discloses a kind of towards the extensive mimo system of FDD is rebuild and multiuser transmission method, include the following steps: that user sends ascending pilot frequency to base station, the deflection and time delay of all propagation paths in each subscriber channel are extracted in pilot orthogonal between user, base station；Base station carries out user's selection and scheduling using estimated direction angle information；Base station sends the sparse pilot tone of downlink, and selected user estimates the downlink gain of every propagation path according to the pilot tone received and feeds back to base station, and base station is that each selected user rebuilds down channel；Pre-coding matrix is designed using the down channel rebuild in base station, transmits for descending multi-user data.The present invention breaches the bottleneck that the extensive mimo system multiuser channel of FDD is rebuild with lower expense, realizes the descending multi-user non-interference data transmission with high-throughput.
Description
Technical field
The invention belongs to wireless communication technology fields, and in particular to a kind of downlink letter towards the extensive mimo system of FDD
Road is rebuild and multiuser transmission method.
Background technique
Multiple-input and multiple-output (MIMO) technology has been always treated as promoting frequency spectrum since forth generation (4G) mobile communication system
The key means of efficiency.By setting up mutiple antennas in base station end, so that Spatial Dimension is developed, support with space division multiplexing etc.
Mode enhances space utilization rate, reaches spectrum efficiency promotion.Explosive growth with user to mobile communication business demand is
Meet user demand, at the 5th generation (5G) mobile communication research initial stage, industry proposes the concept of extensive MIMO.Base station end
Large-scale antenna array is configured, to greatest extent upper excavated space freedom degree, supports same frequency service tens place user simultaneously.On a large scale
MIMO technology has been widely regarded as the key technology in 5G and future mobile communications field, has extremely strong commercial value.
However, the introducing of extensive MIMO brings new problem to the system worked under frequency division duplex (FDD) mode.Under
The acquisition of the transmitting terminal channel state information (CSI-T) of line link is to guarantee the important prerequisite of air separation.To obtain higher-dimension
CSI-T, if the completely orthogonal pilot tone of time-frequency domain is used in different antennae port, by running time-frequency resource network and coherence time, phase
The limitation of bandwidth is closed, the completely orthogonal pilot frequency design of hundreds can not design at all.Therefore mimo system extensive for FDD,
Industry usually continues to use codebook-based CSI-T acquisition methods in 4G, presets one group of direction in space code book for every user's selection.So
And this method is suitable for the channel circumstance that space has extremely strong sparsity, is not particularly suited for the richness of FDD low frequency as defined in 5G agreement
Scatter scene.In addition, industry has also carried out a large amount of explorations to compressed sensing based CSI-T method, and the premise of compressed sensing
Equally it is channel sparsity, and excessively high to the calculation processing Capability Requirement of mobile phone terminal, cannot achieve in reality.Therefore, FDD
The acquisition of CSI-T becomes one of the problem of puzzlement industry for a long time in extensive mimo system.
In the extensive mimo system of FDD, when using based on code book or compressed sensing based CSI-T acquisition methods
When, above- mentioned information are fed back to base after calculating the spatial sampling direction of code book number or channel propagation paths by user terminal
It stands, that base station can obtain is only this kind of rough space CSI-T, rather than fine space CSI-T.And it is multi-purpose for downlink
For the transmission of family, rough space CSI-T can not realize that space multi-user interference is eliminated well, so that interference be brought to let out
Dew, causes efficiency of transmission to decline rapidly.Base station must select spatially avoid completely one group of user, could avoid as far as possible
The generation of interference, this also brings higher requirement to user's scheduling strategy.Therefore, under the premise of CSI-T obtains offending,
User in the extensive mimo system of FDD interferes the effect eliminated also to suffer a loss.
In conclusion as how lesser pilot tone and feedback overhead obtain the descending multi-user CSI- with high accuracy
T, and how to guarantee multi-user transmission performance not because interference there are due to suffer a loss, become the extensive mimo system of FDD urgently
The problem of breakthrough.
Summary of the invention
Goal of the invention: it in order to overcome the deficiencies in the prior art, provides a kind of towards the extensive mimo system of FDD
Down channel is rebuild and multiuser transmission method, breaches the bottleneck that the extensive mimo system downlink CSI-T of FDD is obtained, with compared with
Small pilot tone and feedback overhead has rebuild the descending multi-user channel with high accuracy, and has combined system features, provides
A kind of glitch-free descending multi-user transmission method.
Technical solution: to achieve the above object, the present invention specifically uses following technical scheme to solve above-mentioned technical problem:
A kind of down channel reconstruction and multiuser transmission method towards the extensive mimo system of FDD, comprising the following steps:
1) user sends ascending pilot frequency to base station, and all biographies in each subscriber channel are extracted in pilot orthogonal between user, base station
Broadcast the deflection and time delay in path；
2) base station carries out user's selection and scheduling using estimated direction angle information；
3) base station sends the sparse pilot tone of downlink, and selected user estimates under every propagation path according to the pilot tone received
Row gain simultaneously feeds back to base station, and base station is that each selected user rebuilds down channel；
4) pre-coding matrix is designed using the down channel rebuild in base station, transmits for descending multi-user data.
Further, include the following steps: in the step 2
2.1) one group of sample orientation angle is preset in base station, these sample orientation angles are one group of samplings to direction in space, uniformly
Ground covers entire spatial dimension；
2.2) for each deflection extracted in step 1, base station is normalized to the sample orientation nearest from it
On angle, and mark the sample orientation angle；To the same subscriber channel, if the two different deflections extracted normalize to
On identical sample orientation angle, then the deflection extracted the latter is normalized to nearest therewith first temporarily not by this
On the sample orientation angle that user chooses, and mark the sample orientation angle；
2.3) weight at all labeled sample orientation angles is counted, the weight at each sample orientation angle, which is equal to, covers this
The number of users at sample orientation angle；
2.4) these deflections are put into selected sample orientation angle set, and all users is put into selected user set
Further, in the step 2 base station judge sample orientation angle in selected sample orientation angle set number whether
More than thresholding, gathers if being more than thresholding from selected sample orientation angle and delete the smallest sample orientation angle of first weight, and from
The user for covering the sample orientation angle is deleted in selected user set, updates selected sample orientation angle set and selected user collection
It closes；It repeats the above process, until the number at sample orientation angle is no more than thresholding in the set of selected sample orientation angle.
Further, the step 3 specifically comprises the following steps:
3.1) base station sends the sparse pilot tone of downlink, and descending pilot frequency is sequentially modulated selected sample using beamforming technique
Sample orientation angle in deflection set corresponds to orthogonal between the pilot tone at different sample orientation angles；
3.2) it to each user in selected user set, only receives downlink corresponding to the sample orientation angle of its covering and leads
Frequently, and using the downlink gain of every propagation path in descending pilot frequency estimation channel, by downlink gain feedback to base station；
3.3) it to each user in selected user set, deflection that base station is estimated according to uplink, time delay and feeds back
The downlink gain arrived rebuilds down channel for the user.
Further, base station is using the down channel rebuild in the step 4, and design is with multiuser interference suppression ability
Pre-coding matrix, which is applied to during downlink data transmission, and base station is to the use in selected user set
Family is serviced in a manner of space division multiple access.
The utility model has the advantages that the invention adopts the above technical scheme compared with prior art, have following technical effect that
1, this method has preset one group of sample orientation angle, and the deflection extracted is normalized on sample orientation angle, etc.
The direction in space unification by different user is same as into same group of space base, descending pilot frequency designs special from for a certain user
Become the public guide frequency that all users share with pilot tone, saves descending pilot frequency expense.
2, this method can directly utilize the CSI-T of high accuracy, carry out downlink after reconstructing descending multi-user CSI-T
The design of link method for precoding carries out space division multiple access transmission to all users for rebuilding channel, eliminates inter-user interference,
Realize the utmostly excavation of extensive MIMO spatial degrees of freedom.
Detailed description of the invention
Fig. 1 is the calculation method of sample orientation angle weight and deletion user's criterion schematic diagram in the embodiment of the present invention.
Specific embodiment
The present invention provides a kind of down channel towards the extensive mimo system of FDD and rebuilds and multiuser transmission method, tool
Body includes the following steps:
1) user sends ascending pilot frequency to base station, and all biographies in each subscriber channel are extracted in pilot orthogonal between user, base station
Broadcast the deflection and time delay in path；
2) base station carries out user's selection and scheduling using estimated direction angle information, specifically includes the following steps:
2.1) one group of sample orientation angle is preset in base station, these sample orientation angles are one group of samplings to direction in space, uniformly
Ground covers entire spatial dimension；
2.2) for each deflection extracted in step 1, base station is normalized to the sample orientation nearest from it
On angle, and mark the sample orientation angle；To the same subscriber channel, if the two different deflections extracted normalize to
On identical sample orientation angle, then the deflection extracted the latter is normalized to nearest therewith first temporarily not by this
On the sample orientation angle that user chooses, and mark the sample orientation angle；
2.3) weight at all labeled sample orientation angles is counted, the weight at each sample orientation angle, which is equal to, covers this
The number of users at sample orientation angle；
2.4) these deflections are put into selected sample orientation angle set, and all users is put into selected user set；
2.5) base station judges whether the number at sample orientation angle in selected sample orientation angle set is more than thresholding, is such as more than door
Limit, which is then gathered from selected sample orientation angle, deletes the smallest sample orientation angle of first weight, and deletes from selected user set
The user at the sample orientation angle is covered, selected sample orientation angle set and selected user set are updated；It repeats the above process, directly
Into selected sample orientation angle set, the number at sample orientation angle is no more than thresholding.
3) base station sends the sparse pilot tone of downlink, and selected user estimates under every propagation path according to the pilot tone received
Row gain simultaneously feeds back to base station, and base station is that each selected user rebuilds down channel, specifically comprises the following steps:
3.1) base station sends the sparse pilot tone of downlink, and descending pilot frequency is sequentially modulated selected sample using beamforming technique
Sample orientation angle in deflection set corresponds to orthogonal between the pilot tone at different sample orientation angles；
3.2) it to each user in selected user set, only receives downlink corresponding to the sample orientation angle of its covering and leads
Frequently, and using the downlink gain of every propagation path in descending pilot frequency estimation channel, by downlink gain feedback to base station；
3.3) it to each user in selected user set, deflection that base station is estimated according to uplink, time delay and feeds back
The downlink gain arrived rebuilds down channel for the user.
4) pre-coding matrix is designed using the down channel rebuild in base station, transmits for descending multi-user data.Wherein, base
It stands using the down channel rebuild, designs the pre-coding matrix with multiuser interference suppression ability, which is answered
During using downlink data transmission, base station services the user in selected user set in a manner of space division multiple access.
Down channel reconstruction and multi-user's biography can be provided for the extensive mimo system of FDD in order to verify method of the invention
Transmission method is further elaborated technical solution of the present invention in conjunction with attached drawing below by specific embodiment:
In the extensive mimo system of FDD, base station is located at center of housing estate, sets up large-scale antenna array, antenna element number
For M, magnitude is usually 102、103.K user is uniformly random to be distributed in Intra-cell, and each user is all made of single antenna configuration.
The present embodiment will select in K user, rebuild to the down channel of selected user, and carry out down to selected user
Transmission that line link is noiseless design, includes the following steps:
Step 1: each user sends ascending pilot frequency, mutually orthogonal between the ascending pilot frequency of different user, for user k,
K=1 ..., K, base station estimate the delay, τ of every propagation path in the subscriber channel according to the ascending pilot frequency receivedk,lWith
Deflection θk,l, wherein l=1 ..., Lk, LkFor the propagation path number in user's k channel.
Step 2: base station defines one group of sample orientation angleFor user k, base station is by θk,l, l=
1,...,LkIt is normalized on sample orientation angle nearest therewith respectively, and marks the sample orientation angle, such as θk,l+1Nearest sample
This deflection and θk,lThe sample orientation angle being normalized to is identical, then by θk,l+1It is normalized to another nearest sample side therewith
To angle, and mark the sample orientation angle.After the completion of the deflection of all users is all normalized, base station is by all labeled samples
This deflection is put into selected sample orientation angle set Φ, counts the weight at each sample orientation angle in Φ, each sample orientation
The weight at angle etc. and the number of users for marking the sample orientation angle, as shown in Fig. 1,Weight be 1,Weight be 2, then
All users are put into selected user set Ψ.Base station counts the sample orientation angle number in Φ, judges whether to be more than thresholding.
If being more than thresholding, the smallest first sample orientation angle of weight in Φ is deleted, as shown in figure 1Mark is deleted from Ψ simultaneously
Record a demerit the user at the sample orientation angle, user 4 as shown in figure 1, then updates Φ and Ψ.The sample orientation angle in Φ is judged again
Whether number is more than thresholding, is repeated the above process if being more than, until the sample orientation angle number T in Φ is no more than thresholding, at this time
User in Ψ is k1,...,。
Step 3: base station sends the sparse pilot tone of T downlink, mutually orthogonal, pilot tone 1 to pilot tone T difference between each pilot tone
Sample orientation angle 1 to the sample orientation angle T being directed toward in Φ.For the user in ΨOnly receive its label
Pilot tone corresponding to the sample orientation angle crossed, and estimate according to these pilot tones the downlink gain of every propagation path in channelL=1 ...,, and yield value is fed back into base station.For userBase station utilizesRebuild it
Down channel
Step 4: the descending multi-user channel that base station is obtained using reconstructionCalculating has multi-user
The force zero pre-coding matrix W=H of interference rejection capabilityH(HHH)-1, for during descending multi-user space division multiple access data transmission.
Claims (6)
1. a kind of down channel towards the extensive mimo system of FDD is rebuild and multiuser transmission method, it is characterised in that: including
Following steps:
1) user sends ascending pilot frequency to base station, and all propagation roads in each subscriber channel are extracted in pilot orthogonal between user, base station
The deflection and time delay of diameter；
2) base station carries out user's selection and scheduling using estimated direction angle information；
3) base station sends the sparse pilot tone of downlink, and selected user increases according to the downlink that the pilot tone received estimates every propagation path
Benefit simultaneously feeds back to base station, and base station is that each selected user rebuilds down channel；
4) pre-coding matrix is designed using the down channel rebuild in base station, transmits for descending multi-user data.
2. a kind of down channel towards the extensive mimo system of FDD according to claim 1 is rebuild and multi-user transmission
Method, it is characterised in that: include the following steps: in the step 2
2.1) one group of sample orientation angle is preset in base station, these sample orientation angles are one group of samplings to direction in space, are equably covered
Entire spatial dimension is covered；
2.2) for each deflection extracted in step 1, base station is normalized on the sample orientation angle nearest from it,
And mark the sample orientation angle；
2.3) weight at all labeled sample orientation angles is counted, the weight at each sample orientation angle, which is equal to, covers the sample
The number of users of deflection；
2.4) these deflections are put into selected sample orientation angle set, and all users is put into selected user set.
3. a kind of down channel towards the extensive mimo system of FDD according to claim 2 is rebuild and multi-user transmission
Method, it is characterised in that: to the same subscriber channel in the step 2.2, if the two different deflections extracted are returned
One changes on identical sample orientation angle, then the deflection extracted the latter is normalized to nearest therewith first temporarily
On the sample orientation angle that do not chosen by the user, and mark the sample orientation angle.
4. a kind of down channel towards the extensive mimo system of FDD according to claim 2 is rebuild and multi-user transmission
Method, it is characterised in that: base station judges whether the number at sample orientation angle in selected sample orientation angle set surpasses in the step 2
Thresholding is crossed, gathers if being more than thresholding from selected sample orientation angle and deletes the smallest sample orientation angle of first weight, and from institute
It selects in the set of family and deletes the user for covering the sample orientation angle, update selected sample orientation angle set and selected user collection
It closes；It repeats the above process, until the number at sample orientation angle is no more than thresholding in the set of selected sample orientation angle.
5. a kind of down channel towards the extensive mimo system of FDD according to claim 2 is rebuild and multi-user transmission
Method, it is characterised in that: the step 3 specifically comprises the following steps:
3.1) base station sends the sparse pilot tone of downlink, and descending pilot frequency is sequentially modulated selected sample orientation using beamforming technique
Sample orientation angle in the set of angle corresponds to orthogonal between the pilot tone at different sample orientation angles；
3.2) to each user in selected user set, descending pilot frequency corresponding to the sample orientation angle of its covering is only received,
And using the downlink gain of every propagation path in descending pilot frequency estimation channel, by downlink gain feedback to base station；
3.3) to each user in selected user set, what deflection, time delay and the feedback that base station is estimated according to uplink obtained
Downlink gain rebuilds down channel for the user.
6. a kind of down channel towards the extensive mimo system of FDD according to claim 1 is rebuild and multi-user transmission
Method, it is characterised in that: base station has multiuser interference suppression ability using the down channel rebuild, design in the step 4
Pre-coding matrix, which is applied to during downlink data transmission, and base station is to the use in selected user set
Family is serviced in a manner of space division multiple access.
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| CN109167618B (en) | 2021-03-26 |
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