CN107911153A - A kind of down channel method for reconstructing based on uplink CSI towards FDD system - Google Patents
A kind of down channel method for reconstructing based on uplink CSI towards FDD system Download PDFInfo
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- CN107911153A CN107911153A CN201711046041.4A CN201711046041A CN107911153A CN 107911153 A CN107911153 A CN 107911153A CN 201711046041 A CN201711046041 A CN 201711046041A CN 107911153 A CN107911153 A CN 107911153A
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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
- H04B7/0456—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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- 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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- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses one kind towards frequency division duplex（FDD）System based on uplink channel status information（CSI）Down channel method for reconstructing, base station estimates uplink CSI first with uplink detection signal, include the gain of one or more propagation path, deflection, and time delay, then the sparse pilot tone of downlink is sent, or utilize uplink and downlink angle reciprocity, descending pilot frequency is sent up in one or more estimated propagation path side, user equipment is reevaluated using descending pilot frequency and feeds back the gain of every propagation path, the deflection and time delay for every propagation path that last base station is estimated using uplink, and user equipment revaluation and the gain of the every propagation path fed back, rebuild down channel.The invention provides the method for reconstructing of FDD system downlink CSI, especially overcomes the problem that the extensive multi-input multi-output system downlink CSI of FDD are obtained.
Description
Technical field
The present invention relates to a kind of down channel based on uplink channel status information CSI towards FDD system
Method for reconstructing, more particularly to a kind of down channel based on uplink CSI towards the extensive multiple-input and multiple-output mimo systems of FDD
Method for reconstructing.
Background technology
Extensive MIMO is one of important technology of the 5th third-generation mobile communication, by configuring extensive antenna array in base station
Row, can be substantially improved spatial degrees of freedom, improve space division multiple access dimension, smooth thermal noise and rapid fading.To obtain higher-dimension
CSI, while control the expense of pilot tone and control channel, extensive mimo system are adjacent small often by the way of pilot frequency multiplexing
Section uses non-orthogonal pilot, causes pilot pollution serious.Again since the coherence time of channel is limited, how in limited training
Channel estimation is completed under resource, it is necessary to be studied and explored.Therefore, the acquisition of CSI becomes the problem of extensive mimo system
One of.
Commercial dual-mode includes time division duplex (TDD) and FDD at present.The extensive mimo system in part is passed using TDD
Defeated pattern, after uplink channel estimation is completed by uplink detection signal, using the reciprocity between uplink and downlink channel, directly will
Uplink channel estimation result is applied in downlink.However, most of wireless communication system uses FDD transmission modes, at this time
Channel reciprocity has not existed, and the up channel estimated by uplink detection process may not apply to downlink.Since downlink is believed
Road estimates that required pilot-frequency expense and feedback overhead are directly proportional to antenna number, to ensure the time-frequency money needed for data service
Source is measured, and real system will strictly control the expense of pilot tone and feedback, cause the extensive MIMO base station for working in fdd mode to be only capable of
Obtain a small amount of downlink CSI.In addition, down channel estimation is completed by user equipment, the calculating of user equipment and disposal ability have
Limit, the estimation limited accuracy of higher-dimension channel.Therefore, the CSI of the extensive mimo systems of FDD, which is obtained, becomes bottleneck.
Primary Study has been unfolded in CSI acquisitions for the extensive mimo systems of FDD, and strategy widely used at present is to obtain
Channel correlation matrix is used for downlink transfer, but this method needs larger expense, and acquisition of information difficulty is larger and downlink passes
Defeated performance is bad.The another gain for having result of study to propose uplink and downlink propagation path, deflection and time delay are essentially equal, only using upper
Row estimated result can directly reconstruct down channel, and without downlink training process, but actual channel measurement result is shown
The down channel reconstructed results error trained without downlink is larger, can not meet the needs of real system.
In conclusion such as how less overhead obtains the extensive MIMO downlinks CSI of FDD with high availability
The problem urgently broken through as the 5th third-generation mobile communication.
The content of the invention
In order to overcome the shortcomings of the prior art, the present invention provide it is a kind of towards FDD system based under uplink CSI
Row channel reconstructing method, breaches the bottleneck that the extensive mimo system downlink CSI of FDD are obtained, utilizes uplink and downlink angle information
Reciprocity, with less descending pilot frequency expense and feedback overhead, realizes the reconstruction of the extensive mimo system down channels of FDD, together
When ensure that rebuild channel availability.
The present invention uses following technical scheme to solve above-mentioned technical problem：
The present invention provides a kind of down channel method for reconstructing based on uplink CSI towards FDD system, Frequency Division Duplex FDD
In wireless transmitting system, base station, using uplink and downlink angle reciprocity, passes through hair after uplink channel status information CSI is estimated
Descending pilot frequency is sent, user equipment is reevaluated and feedback fraction CSI, utilizes the uplink CSI and downlink revaluation that estimate and anti-
The CSI of feedback, rebuilds down channel；Specifically comprise the following steps：
Step 1, user equipment sends uplink detection signal, and base station is estimated using the uplink detection signal received
Row CSI；
Step 2, base station sends descending pilot frequency, and user equipment utilizes the descending pilot frequency received, reevaluates downlink CSI,
And by uplink by the downlink CSI feedback reevaluated to base station；
Step 3, base station utilizes user equipment revaluation and the downlink fed back in the uplink CSI estimated in step 1 and step 2
CSI, rebuilds down channel.
As the further prioritization scheme of the present invention, the uplink CSI that base station is estimated in step 1 propagates road for one or more
The information in footpath, the propagation path number estimated are L, meet that L is more than or equal to 1.
As the further prioritization scheme of the present invention, the information of propagation path includes the gain of this propagation path, direction
Angle and time delay.
As the further prioritization scheme of the present invention, base station sends descending pilot frequency in step 2, including sparse pilot tone or
The pilot tone sent on deflection estimated by step 1.
As the further prioritization scheme of the present invention, sparse pilot tone includes frequency-domain sparse interpolation pilot tone, the sparse interpolation of time domain
Pilot tone.
As the further prioritization scheme of the present invention, the pilot tone sent on the deflection estimated by step 1 includes passing through
Wave beam forming or the pilot tone of precoding.
As the further prioritization scheme of the present invention, the downlink CSI that user equipment is reevaluated and fed back in step 2 includes
The gain of propagation path in step 1 estimated by base station.
As the further prioritization scheme of the present invention, base station is reevaluated and fed back receiving user equipment in step 3
CSI after, when rebuilding down channel, the downlink CSI that is reevaluated with user equipment replaces the phase that base station is estimated in step 1
Answer uplink CSI.
As the further prioritization scheme of the present invention, CSI used in base station reconstruction down channel includes in step 3：Step
The propagation road that user equipment is reevaluated and fed back in the deflection of base station estimation propagation path, time delay, and step 2 in rapid 1
The gain in footpath.
As the further prioritization scheme of the present invention, base station can be that multiple user equipmenies rebuild down channel, under transmission
The form of row pilot tone includes：A) sparse pilot tone；B) pilot tone sent on the deflection estimated by step 1, issues different user
The pilot tone of equipment is distinguished in a manner of frequency division；C) pilot tone sent on the deflection estimated by step 1, issues different use
The pilot tone of family equipment is distinguished in a manner of the time-division.
The present invention compared with prior art, has following technique effect using above technical scheme：
1) this method utilizes uplink and downlink angle reciprocity, after uplink estimates angular domain information, it is only necessary to send a small amount of downlink and lead
Frequently, the gain of propagation path and feedback are reevaluated, you can carry out down channel reconstruction, effectively reduce pilot tone and feedback is opened
Pin, solves the problem that the extensive mimo system downlink CSI of FDD are obtained；
2) this method, using a small amount of downlink training and feedback resources, have modified downlink after uplink estimates CSI
Gain, ensures the correctness that the extensive mimo system down channels of FDD are rebuild, greatly improves the availability for rebuilding channel.
Brief description of the drawings
Fig. 1 is the flow chart of the embodiment of the present invention.
Fig. 2 is LTE uplink detection signal patterns.
Fig. 3 is the frequency-domain sparse pilot frequency design that downlink is sent.
Fig. 4 has directive pilot tone to be sent in a manner of wave beam inborn nature or precoding.
Embodiment
Technical scheme is described in further detail below in conjunction with the accompanying drawings：
A kind of down channel based on uplink channel status information (CSI) towards frequency division duplex (FDD) system of the invention
Method for reconstructing, is in FDD wireless transmitting systems, base station, using uplink and downlink angle reciprocity, passes through after uplink CSI is estimated
A small amount of descending pilot frequency is sent, user equipment is reevaluated simultaneously feedback fraction CSI, utilizes the uplink CSI and downlink weight estimated
The CSI for estimating and feeding back, rebuilds down channel.Specifically comprise the following steps：
(1) user equipment sends uplink detection signal, and base station estimates uplink using the uplink detection signal received
CSI.Wherein, the uplink CSI of base station estimation is the information of one or more propagation path, and the propagation path number estimated is L,
Meet that L is more than or equal to 1.For the L bar propagation paths of base station estimation, the information that every propagation path needs to estimate is included but not only
It is limited to：Gain, deflection and the time delay of this propagation path.
(2) base station sends a small amount of descending pilot frequency, and user equipment reevaluates part downlink using the descending pilot frequency received
CSI, and by uplink by the downlink CSI feedback reevaluated to base station.Base station send a small amount of descending pilot frequency include but
It is not limited only to following form：Sparse pilot tone, or the pilot tone sent on the deflection estimated by step (1).Wherein, it is sparse to lead
Frequency includes but are not limited to implemented below form：The sparse interpolation pilot tone of frequency-domain sparse interpolation pilot tone, time domain；Estimated in step (1)
The pilot tone sent on L deflection of meter includes but are not limited to implemented below form：By leading for wave beam forming or precoding
Frequently.The part CSI that user equipment is reevaluated and fed back is included but are not limited to：L bar propagation paths estimated by step (1)
Gain.
(3) base station rebuilds down channel using the uplink CSI of estimation and user equipment revaluation and the downlink CSI of feedback.
Base station is reevaluated and after the part CSI that feeds back receiving user equipment, when rebuilding down channel, with the downlink of revaluation
CSI replaces the corresponding uplink CSI of estimation in step (1).CSI used in base station reconstruction down channel includes but not only limits
In：The deflection of the L bar propagation paths of uplink estimation, time delay, and downlink revaluation and the gain of the L bar propagation paths fed back.
In the method for the present invention, base station can be that multiple user equipmenies rebuild down channel：Corresponding to each user equipment
Propagation path number L can be unequal；The form for sending descending pilot frequency includes but not limited to：A) sparse pilot tone, b) in step (1)
The pilot tone sent on estimated deflection, the pilot tone for issuing different user devices are distinguished in a manner of frequency division, c) in step
Suddenly the pilot tone sent on the deflection estimated by (1), the pilot tone for issuing different user devices are distinguished in a manner of the time-division.
Technical scheme is further elaborated below by specific embodiment：
In the extensive mimo systems of FDD, antenna for base station number is M, and magnitude is usually 102、103, user equipment uses Dan Tian
Line configures.To carry out downlink transmission, base station need to obtain downlink CSI, rebuild down channel hDL.The present embodiment will be right
hDLRebuild, as shown in Figure 1, including the following steps：
Step 1：User equipment sends uplink detection signal, using LTE uplink detection signal patterns, such as the shade in Fig. 2
Shown in part, sent in last OFDM symbol upper comb shape of system assigned timeslot, the signal model that base station receives at this time
For
Y=hULs+n,
Wherein, y ∈ CM×1The uplink detection signal received for base station, hUL∈CM×1Between base station and user equipment
Up channel, the uplink detection signal that s sends for user equipment, n ∈ CM×1For noise, up channel has following expression：
Wherein, L is propagation path number, gUL,lFor the uplink gain of l paths, fULFor uplink carrier frequencies, τlFor the l articles road
The time delay in footpath, a () respond for base-station antenna array, θlFor the deflection of l paths, wherein τlAnd θlIt is unrelated with carrier frequency, tool
There is uplink and downlink reciprocity；
Step 2：Base station is using the uplink detection signal received, using compressed sensing algorithm etc., docking
Collection of letters y is handled and calculated, and is obtainedBar propagation pathGroup parameter Estimation, every group of parameter Estimation includeAccording to reciprocity, estimated by uplinkIt is equally effective in downlink, and gainDo not have
Standby uplink and downlink reciprocity, therefore the gain also needed to downlink is estimated；
Step 3：Base station sends the sparse pilot tone of downlink frequency domain, and the pectination of sparse interpolation is led as shown in the dash area in Fig. 3
Frequently, or in a manner of precoding on the direction of the propagation path estimated by step 2, i.e., in angleUpper hair
Pilot tone is sent, as shown in figure 4, pilot tone is sent after precoding obtains directionality by base station；
Step 4：User equipment utilizes descending pilot frequency, recalculates band downlinkBar propagation pathA yield value,
Obtain
Step 5：The band downlink that user equipment will reevaluateBar propagation pathA yield value, i.e.,Feed back to base station；
Step 6：Base station utilizes uplink estimationDeflection, time delay and the downlink revaluation of bar propagation path are simultaneously fed backThe yield value of bar propagation path, i.e.,Rebuild down channel：
Wherein, fDLFor downlink carrier frequency.
The above, is only the embodiment in the present invention, but protection scope of the present invention is not limited thereto, and is appointed
What be familiar with the people of the technology disclosed herein technical scope in, it will be appreciated that the conversion or replacement expected, should all cover
Within the scope of the present invention, therefore, protection scope of the present invention should be subject to the protection domain of claims.
Claims (10)
- A kind of 1. down channel method for reconstructing based on uplink CSI towards FDD system, it is characterised in that Frequency Division Duplex FDD without In line Transmission system, base station, using uplink and downlink angle reciprocity, passes through transmission after uplink channel status information CSI is estimated Descending pilot frequency, makes user equipment reevaluate simultaneously feedback fraction CSI, using the uplink CSI and downlink revaluation that estimate and feeds back CSI, rebuild down channel；Specifically comprise the following steps：Step 1, user equipment sends uplink detection signal, and base station estimates uplink using the uplink detection signal received CSI；Step 2, base station sends descending pilot frequency, and user equipment reevaluates downlink CSI, and lead to using the descending pilot frequency received Uplink is crossed by the downlink CSI feedback reevaluated to base station；Step 3, base station utilizes user equipment revaluation and the downlink CSI fed back in the uplink CSI estimated in step 1 and step 2, Rebuild down channel.
- 2. a kind of down channel method for reconstructing based on uplink CSI towards FDD system according to claim 1, it is special Sign is that the uplink CSI that base station is estimated in step 1 is the information of one or more propagation path, the propagation path number estimated Mesh is L, meets that L is more than or equal to 1.
- 3. a kind of down channel method for reconstructing based on uplink CSI towards FDD system according to claim 2, it is special Sign is that the information of propagation path includes gain, deflection and the time delay of this propagation path.
- 4. a kind of down channel method for reconstructing based on uplink CSI towards FDD system according to claim 1, it is special Sign is, base station sends descending pilot frequency in step 2, including sparse pilot tone or is sent on the deflection estimated by step 1 Pilot tone.
- 5. a kind of down channel method for reconstructing based on uplink CSI towards FDD system according to claim 4, it is special Sign is that sparse pilot tone includes frequency-domain sparse interpolation pilot tone, the sparse interpolation pilot tone of time domain.
- 6. a kind of down channel method for reconstructing based on uplink CSI towards FDD system according to claim 4, it is special Sign is that the pilot tone sent on the deflection estimated by step 1 includes the pilot tone by wave beam forming or precoding.
- 7. a kind of down channel method for reconstructing based on uplink CSI towards FDD system according to claim 1, it is special Sign is that the downlink CSI that user equipment is reevaluated and fed back in step 2 includes the propagation path estimated by base station in step 1 Gain.
- 8. a kind of down channel method for reconstructing based on uplink CSI towards FDD system according to claim 1, it is special Sign is, base station is reevaluated and after the CSI that feeds back receiving user equipment in step 3, when rebuilding down channel, with use The downlink CSI that family equipment reevaluates replaces the corresponding uplink CSI that base station is estimated in step 1.
- 9. a kind of down channel method for reconstructing based on uplink CSI towards FDD system according to claim 1, it is special Sign is that CSI used in base station reconstruction down channel includes in step 3：The direction of base station estimation propagation path in step 1 The gain for the propagation path that user equipment is reevaluated and fed back in angle, time delay, and step 2.
- 10. a kind of down channel method for reconstructing based on uplink CSI towards FDD system according to claim 1, it is special Sign is that base station can be that multiple user equipmenies rebuild down channel, and sending the form of descending pilot frequency includes：A) sparse pilot tone； B) pilot tone sent on the deflection estimated by step 1, the pilot tone for issuing different user devices carry out area in a manner of frequency division Point；C) pilot tone sent on the deflection estimated by step 1, the pilot tone for issuing different user devices are carried out in a manner of the time-division Distinguish.
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Cited By (10)
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| CN108712243A (en) * | 2018-05-21 | 2018-10-26 | 东南大学 | A kind of multiple carrier channel method for reconstructing towards carrier aggregation system |
| CN109167618A (en) * | 2018-07-05 | 2019-01-08 | 东南大学 | The extensive MIMO down channel of FDD is rebuild and multiuser transmission method |
| CN109327918A (en) * | 2018-11-19 | 2019-02-12 | 东南大学 | A kind of extensive MIMO down channel method for reconstructing of the FDD of low overhead |
| CN110430147A (en) * | 2019-07-15 | 2019-11-08 | 东南大学 | A kind of channel tracking method towards FDD system |
| CN111356171A (en) * | 2018-12-21 | 2020-06-30 | 华为技术有限公司 | Configuration method for reporting Channel State Information (CSI) and communication device |
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| CN113572506A (en) * | 2021-06-01 | 2021-10-29 | 南京泰通科技股份有限公司 | High-speed rail multi-TRP wireless communication method based on FDD precoding |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108712243A (en) * | 2018-05-21 | 2018-10-26 | 东南大学 | A kind of multiple carrier channel method for reconstructing towards carrier aggregation system |
| CN109167618A (en) * | 2018-07-05 | 2019-01-08 | 东南大学 | The extensive MIMO down channel of FDD is rebuild and multiuser transmission method |
| CN109167618B (en) * | 2018-07-05 | 2021-03-26 | 东南大学 | FDD large-scale MIMO downlink channel reconstruction and multi-user transmission method |
| CN109327918B (en) * | 2018-11-19 | 2021-09-28 | 东南大学 | Low-overhead FDD large-scale MIMO downlink channel reconstruction method |
| CN109327918A (en) * | 2018-11-19 | 2019-02-12 | 东南大学 | A kind of extensive MIMO down channel method for reconstructing of the FDD of low overhead |
| CN111356171A (en) * | 2018-12-21 | 2020-06-30 | 华为技术有限公司 | Configuration method for reporting Channel State Information (CSI) and communication device |
| CN110430147A (en) * | 2019-07-15 | 2019-11-08 | 东南大学 | A kind of channel tracking method towards FDD system |
| WO2021016858A1 (en) * | 2019-07-30 | 2021-02-04 | 北京小米移动软件有限公司 | Information sending and receiving methods and apparatuses, sending device and receiving device |
| WO2021036934A1 (en) * | 2019-08-23 | 2021-03-04 | 华为技术有限公司 | Method and apparatus for sending and receiving indication |
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| CN113572506A (en) * | 2021-06-01 | 2021-10-29 | 南京泰通科技股份有限公司 | High-speed rail multi-TRP wireless communication method based on FDD precoding |
| CN113572506B (en) * | 2021-06-01 | 2022-09-16 | 南京泰通科技股份有限公司 | High-speed rail multi-TRP wireless communication method based on FDD precoding |
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