CN106470178A - A kind of descending multi-user MIMO emission system - Google Patents
A kind of descending multi-user MIMO emission system Download PDFInfo
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- CN106470178A CN106470178A CN201510490419.4A CN201510490419A CN106470178A CN 106470178 A CN106470178 A CN 106470178A CN 201510490419 A CN201510490419 A CN 201510490419A CN 106470178 A CN106470178 A CN 106470178A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
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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
- H04B7/0452—Multi-user MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
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Abstract
The present invention proposes a kind of descending multi-user MIMO emission system, and described system also includes supercomposed coding module between layer mapping block and precoding module, for being overlapped coded treatment to the part layer of each user or whole layer.The present invention adopts the descending multi-user MIMO emission system of supercomposed coding, can simply supercomposed coding be combined with the descending PDSCH of LTE, lifts the systematic function of existing MU MIMO, and less to prior art and protocol impact.
Description
Technical field
The present invention relates to a kind of descending multi-user MIMO emission system.
Background technology
With the further evolution of LTE, the performance of MU-MIMO is still had large improvement space.Even if
Precoding of making a start is non-fully orthogonal, simultaneously from making a start and receiving end carries out combined optimization, such as using adaptive point
Join transmit power and CW-IC receiver, comprise non-orthogonal multiple and access NOMA, also can improve
MUMIMO systematic function.A kind of method is based on supercomposed coding (Superposition Coding, SC)
Technology is a kind of hierarchical coding modulation technique, its basic thought be system according to different target transmission speed,
Channel status is quantified as the grade of different channels quality, each channel quantitative grade corresponds to a determination
Target transmission speed.The corresponding transfer rate of matter measured channel quantitative grade is higher, ropy channel
The corresponding transfer rate of quantification gradation is relatively low.Two groups of signals are independently carried out by different targeted rate respectively
Coding, and be mapped on corresponding planisphere, then again it is overlapped.
The transmission process of existing descending PDSCH is as shown in Figure 1：Scramble first, be then modulated exporting
Complex-valued symbol, then carries out layer mapping, is secondly precoding, and RE maps and generates OFDM symbol,
Send on different antennae port afterwards.
In LTE, PDSCH supports four kinds of modulation systems QPSK, 16QAM, 64QAM and 256QAM.,
It is illustrated in figure 2 the planisphere of QPSK and 16QAM.
Supercomposed coding is used for improving LTE system by SI (RP-150496) research of the new project verification of 3GPP at present
In descending multi-user MIMO performance, but for how to apply supercomposed coding also still discuss during.
Content of the invention
For the problems referred to above, the present invention proposes a kind of descending multi-user MIMO emission system, described system
Also include supercomposed coding module between layer mapping block and precoding module, described supercomposed coding module is used for
Coded treatment is overlapped to the part layer or whole layer of each user.
Further, described system includes：Remote user data and nearly user data are carried out respectively scrambling, adjust
Bit groupings processed and layer mapping are processed, output layer bit group data；To the layer bit that need not be overlapped coding
Group data is directly modulated mapping, and carries out combined modulation mapping to the data needing to be overlapped encoding；Right
Data after modulation mapping/combined modulation mapping carries out precoding, RE mapping, generates OFDM symbol concurrent
Penetrate.
Further, described combined modulation mapping includes：The needs of remote user and nearly user are overlapped compiling
The data of code is respectively adopted the modulation system identical or different with other data that need not be overlapped encoding and enters
Row modulation, is then multiplied by power weights respectively, finally carries out data investigation.
Further, in the planisphere of described combined modulation mapping, the front portion of mapped bits is remote using
Family layer bit group data, rear portion is nearly client layer bit group data, and the power weights of described remote user are determined
The central point of nearly user's planisphere in fixed every quadrant, the power weights of described nearly user determine closely to use in every quadrant
The distance between family constellation point.
Further, in the planisphere of described combined modulation mapping, the front portion of mapped bits is remote using
Family layer bit group data, rear portion is nearly client layer bit group data, described remote i-th layer of bit of user
The constellation point of group data modulation determines that the planisphere of nearly user data modulation and i-th layer of bit group data are modulated
Constellation point, the principle of described decision is that adjacent Hamming distance is minimum.
Further, the planisphere of described combined modulation mapping is gray mappings.
Further, described combined modulation mapping includes：By corresponding remote client layer bit group with nearly user's
Layer bit group connects into a string bit；Described a string bit is modulated mapping, order of modulation is by remote user
Determine with the order of modulation sum of nearly user.
Further, described modulation system is the corresponding corresponding modulation system of order of modulation in current LTE.
Further, described modulation bit is grouped into and according to order of modulation, the data after scrambling is carried out bit and divided
Group.
Further, described system includes：Remote user data and nearly user data are carried out respectively scrambling, adjust
System and layer mapping are processed, output layer bit group data；The data needing to be overlapped encoding is overlapped compiling
Code；Data after layer bit group data/supercomposed coding is carried out with precoding, RE mapping, generates OFDM symbol
Number and launch.
Further, described supercomposed coding includes：The remote user symbol needing to be overlapped encoding is multiplied by work(
The rate factorThe nearly user symbol needing to be overlapped encoding is multiplied by power factorBy above-mentioned two
Person is added.
Further, also include：Before being multiplied by described power factor, the first constellation according to described remote user
Point carries out constellation point adjustment to described nearly user, and described adjustment is carried out according to the following table：
The present invention proposes a kind of descending multi-user MIMO using supercomposed coding and makes a start processing procedure, can letter
Single is combined supercomposed coding with the descending PDSCH of LTE, lifts the systematicness of existing MU-MIMO
Can, and less to prior art and protocol impact.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to enforcement
Example or description of the prior art in required use accompanying drawing be briefly described it should be apparent that, retouch below
Accompanying drawing in stating is some embodiments of the present invention, for those of ordinary skill in the art, is not paying
On the premise of creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the transmission system block diagram of descending PDSCH in existing LTE；
Fig. 2 is the planisphere of QPSK and 16QAM that PDSCH supports in LTE；
Fig. 3 is the transmission system block diagram that embodiment of the present invention 1 proposes；
Fig. 4 is the combined modulation Mapping implementation block diagram that the embodiment of the present invention 2 proposes；
Fig. 5 is the combined modulation mapped constellation figure that the embodiment of the present invention 2 proposes；
Fig. 6 is the combined modulation Mapping implementation block diagram that the embodiment of the present invention 3 proposes；
Fig. 7 is the combined modulation mapped constellation figure that the embodiment of the present invention 3 proposes；
Fig. 8 is the combined modulation Mapping implementation block diagram that the embodiment of the present invention 4 proposes；
Fig. 9 is the transmission system block diagram that embodiment of the present invention 2 proposes；
Figure 10 is that the supercomposed coding that the embodiment of the present invention 5 proposes realizes block diagram；
Figure 11 is that the supercomposed coding that the embodiment of the present invention 6 proposes realizes block diagram；
Specific embodiment
Purpose, technical scheme and advantage for making the embodiment of the present invention are clearer, below in conjunction with the present invention
Accompanying drawing in embodiment, the technical scheme in the embodiment of the present invention is clearly and completely described it is clear that
Described embodiment is a part of embodiment of the present invention, rather than whole embodiments；It should be noted that
In the case of not conflicting, the embodiment in the application and the feature in embodiment can be mutually combined.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained under the premise of not making creative work
Every other embodiment, broadly fall into the scope of protection of the invention.
One embodiment of the present of invention proposes a kind of descending multi-user MIMO emission system, and described system exists
Supercomposed coding module is also included, it is right that described supercomposed coding module is used between layer mapping block and precoding module
The part layer of each user or whole layer are overlapped coded treatment.
Above-described embodiment adopts the descending multi-user MIMO emission system of supercomposed coding, can simply will fold
Plus coding is combined with the descending PDSCH of LTE, lift the systematic function of existing MU-MIMO, and right
Prior art and protocol impact are less.
In one alternate embodiment, including：Remote user data and nearly user data are carried out respectively scramble,
Modulation bit packet and layer mapping are processed, output layer bit group data；To the layer ratio that need not be overlapped coding
Special group data is directly modulated mapping, and carries out combined modulation mapping to the data needing to be overlapped encoding；
Precoding, RE mapping are carried out to the data after modulation mapping/combined modulation mapping, generates OFDM symbol simultaneously
Transmitting.
In one alternate embodiment, combined modulation mapping includes：The needs of remote user and nearly user are carried out
The data of supercomposed coding is respectively adopted the modulation identical or different with other data that need not be overlapped encoding
Mode is modulated, and is then multiplied by power weights respectively, finally carries out data investigation.
In one alternate embodiment, described combined modulation mapping planisphere in, mapped bits previous
Part is remote client layer bit group data, and rear portion is nearly client layer bit group data, described remote user's
Power weights determine the central point of nearly user's planisphere in every quadrant, and the power weights of described nearly user determine often
The distance between nearly user's constellation point in quadrant.
In one alternate embodiment, described combined modulation mapping planisphere in, mapped bits previous
Part is remote client layer bit group data, and rear portion is nearly client layer bit group data, and described remote user the
The planisphere of constellation point decision nearly user data modulation of i layer bit group data modulation and i-th layer of bit
The constellation point of group data modulation, the principle of described decision is that adjacent Hamming distance is minimum.
In one alternate embodiment, the planisphere of described combined modulation mapping is gray mappings.
In one alternate embodiment, described combined modulation mapping includes：By corresponding remote client layer bit group
Connect into a string bit with the layer bit group of nearly user；Described a string bit is modulated mapping, modulation order
Number is determined by the order of modulation sum of remote user and nearly user.
In one alternate embodiment, described modulation system is the corresponding corresponding tune of order of modulation in current LTE
Mode processed.
In one alternate embodiment, described modulation bit be grouped into according to order of modulation by scramble after data
Carry out bit groupings.
In one alternate embodiment, described system includes：Remote user data and nearly user data are entered respectively
Row scrambling, modulation and layer mapping are processed, output layer bit group data；Needs are overlapped with the data encoding
It is overlapped encoding；Data after layer bit group data/supercomposed coding is carried out with precoding, RE mapping, raw
Become OFDM symbol and launch.
In one alternate embodiment, described supercomposed coding includes：The remote user that will need to be overlapped encoding
Symbol is multiplied by power factorThe nearly user symbol needing to be overlapped encoding is multiplied by power factorSaid two devices are added.
In one alternate embodiment, also include：Before being multiplied by described power factor, first according to described remote
The constellation point of user carries out constellation point adjustment to described nearly user, and described adjustment is carried out according to the following table：
Scheme 1：In this programme, after user data scrambler, increase modulation bit packet, then to layer
Bit group data carries out layer mapping, then judges whether the layer that in need and other users are overlapped, if having
Then carry out combined modulation.Send system block diagram and refer to Fig. 3, including following basic step.
First, remote user data and nearly user data are each scrambled；
Secondly, first it is not modulated after scrambling, but is modulated bit groupings, output is referred to as modulation ratio
Special group；Described modulation bit is grouped referring specifically to embodiment 1
3rd, remote user, nearly user's complete independently layer mapping process, layer mapping to as if modulation bit group；
As certain user needs to be divided into υ layer, every layer hasIndividual layer bit group, is output as layer after layer mapping
Bit group data
4th it is not necessary to other user data be overlapped encode be directly modulated map；Need with
Other user data be overlapped encode carry out combined modulation mapping；The mapping of described combined modulation referring specifically to
Embodiment 2, embodiment 3 and embodiment 4；
Finally, carry out precoding, RE maps, generate OFDM symbol, transmitting.
Example 1：Modulation bit packet transaction
Modulation bit packet is the data bit packet after scrambling according to order of modulation, such as one data block modulation
Exponent number is Qm, after scrambling, output bit isThen this data block is adjusted
Output after bit groupings processed is referred to as modulation bit group, is expressed as：
Wherein
Embodiment adds modulation bit packet transaction, and be not modulated.So process and be advantageous in that,
The superimposed layer that the nearly user of remote user can be directed to carries out supercomposed coding and the modulation of bit levels；Compare elder generation
It is modulated the flow process that layer maps last supercomposed coding, can more easily judge the star that currently should map again
Seat point, without again reverting to original bit (or the amplitude by complex-valued symbol and phase place) by complex-valued symbol
Carry out constellation mapping again.Simplify implementation complexity.
Example 2：Combined modulation mapping 1
Superimposed layer carries out identical modulation system with the layer bit group data of other non-superimposed codings, is then multiplied by
After power weights, remote user data is superimposed with nearly user data, realizes block diagram as shown in Figure 4.
Assume that remote user is QPSK, nearly user is QPSK, be overlapped the planisphere such as Fig. 5 after encoding,
It can be seen that the mapping bit in the planisphere of combined modulation can be divided into two parts, front portion is the layer ratio of remote user
Special group data, rear portion is the layer bit group data of nearly user.The power weights of remote user determine every quadrant
In nearly user's planisphere central point；In the power weights every lower bound of decision of nearly user between nearly user's constellation point
Distance.
The present embodiment is that the superimposed layer of nearly user is identical with the planisphere of non-superimposed layer, and getting well of this scheme is in
In the process simplifying receiving terminal.
Example 3：Combined modulation mapping 2
According to the constellation point of remote i-th layer of bit group data modulation of user, determine the star of nearly user data modulation
Seat figure and the constellation point of i-th layer of bit group data modulation, the principle that it determines is to make the most adjacent Hamming distance
Little, a kind of general solution system is by Gray mapping.Now nearly user's supercomposed coding is non-folded with other
Plus the layer bit group data of coding carries out different modulation systems, after being then multiplied by power weights, remote number of users
It is superimposed according to nearly user data.Realize block diagram as shown in Figure 6.
If remote user is QPSK, nearly user is QPSK, and the planisphere after being overlapped encoding is Fig. 7,
It can be seen that the mapping bit in the planisphere of combined modulation equally can be divided into two parts, front portion is remote user
Layer bit group data, rear portion is the layer bit group data of nearly user.When remote i-th layer of bit group of user
When data is different, nearly user's mapping position is also different accordingly.
The superimposed layer of the nearly user of the present embodiment is different from the planisphere of non-superimposed layer, and general-purpose system is to carry out Gray
Mapping, makes the Hamming distance minimum of adjacent node after superposition, is advantageous in that and can improve demodulation receptivity.
Example 4：Combined modulation mapping 3
According to the order of modulation sum of remote user and nearly user, obtain supercomposed coding and adopted total order of modulation,
In corresponding LTE up till now, the modulation system of corresponding order of modulation, carries out joint constellation mapping.
Refer to Fig. 8, main inclusion：
The layer bit group of corresponding remote client layer bit group and nearly user is connected into a string bit by the first step
This string bit is modulated mapping by second step, and modulation system is by the modulation order of remote user and nearly user
Number sum determines.
The combined modulation mode of the present embodiment is the modulation system in existing LTE protocol, is advantageous in that and does not need
Introduce new planisphere, the process made a start can be simplified.
Scheme 2：This programme on the basis of the process of current LTE downstream data channel, layer map after
And before precoding, increase supercomposed coding and process, realize the data investigation of remote user and nearly user.Send system
System block diagram refers to Fig. 9, main inclusion：
First, remote user data and nearly user data each carry out scrambling, modulate, layer mapping；
Secondly, two users' data symbol part or whole layer are overlapped encoding, and are specifically shown in embodiment 5 and reality
Apply example 6；
Finally, carry out pre-encode operation, be mapped to physical resource, generate ofdm signal, transmitting.
Example 5：Supercomposed coding 1
Refer to Figure 10 it would be desirable to the remote user symbol being overlapped encoding is multiplied by power factorNearly use
Family symbol is multiplied by power factorBoth are added, and realize the supercomposed coding of two users' layer data, here
The layer being overlapped encoding is called superimposed layer.Other layers of remote user, other layers of nearly user do not carry out work(
Rate adjusts.
Example 6：Supercomposed coding 2
Realize block diagram and refer to Figure 11.The present embodiment is nearly user data symbol is entered with the difference implementing 5
Planetary point adjusts, and its adjustment is to determine current constellation point based on remote user's constellation point.
As remote user adopts QPSK, nearly user adopts QPSK to modulate, and nearly user data symbol according to the form below enters
Planetary point adjusts：
One of ordinary skill in the art will appreciate that：The all or part of step realizing said method embodiment can
Completed with the hardware related by programmed instruction, aforesaid program can be stored in an embodied on computer readable and deposit
In storage media, this program upon execution, executes the step including said method embodiment；And aforesaid storage
Medium includes：ROM, RAM, magnetic disc or CD etc. are various can be with the medium of store program codes.
Finally it should be noted that：Above example is only in order to illustrating technical scheme, rather than it is limited
System；Although being described in detail to the present invention with reference to the foregoing embodiments, those of ordinary skill in the art
It should be understood that：It still can be modified to the technical scheme described in foregoing embodiments, or to it
Middle some technical characteristics carry out equivalent；And these modifications or replacement, do not make appropriate technical solution
Essence departs from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (12)
1. a kind of descending multi-user MIMO emission system is it is characterised in that described system maps mould in layer
Supercomposed coding module is also included, described supercomposed coding module is used for each user's between block and precoding module
Part layer or whole layer are overlapped coded treatment.
2. system according to claim 1 is it is characterised in that described system：
Remote user data and nearly user data are carried out respectively scramble, modulation bit packet and layer mapping are processed,
Output layer bit group data；
The layer bit group data that need not be overlapped encoding directly is modulated mapping, needs are overlapped
The data of coding carries out combined modulation mapping；
Precoding, RE mapping are carried out to the data after modulation mapping/combined modulation mapping, generates OFDM symbol
Number and launch.
3. system according to claim 2 is it is characterised in that the mapping of described combined modulation includes：
The data being overlapped encoding to the needs of remote user and nearly user is respectively adopted and need not be overlapped with other
The modulation system that the data of coding is identical or different is modulated, and is then multiplied by power weights respectively, the most laggard
Row data investigation.
4. system according to claim 3 it is characterised in that described combined modulation mapping star
Seat in figure, the front portion of mapped bits is remote client layer bit group data, and rear portion is nearly client layer ratio
Special group data, the power weights of described remote user determine the central point of nearly user's planisphere in every quadrant, described
The power weights of nearly user determine the distance between nearly user's constellation point in every quadrant.
5. system according to claim 3 it is characterised in that described combined modulation mapping star
Seat in figure, the front portion of mapped bits is remote client layer bit group data, and rear portion is nearly client layer ratio
Special group data, the constellation point of described remote i-th layer of bit group data modulation of user determines nearly user data modulation
Planisphere and the modulation of i-th layer of bit group data constellation point, the principle of described decision is adjacent Hamming distance
From minimum.
6. system according to claim 5 it is characterised in that described combined modulation mapping constellation
Figure is gray mappings.
7. system according to claim 2 is it is characterised in that the mapping of described combined modulation includes：
The layer bit group of corresponding remote client layer bit group and nearly user is connected into a string bit；
By described a string bit be modulated map, order of modulation by remote user and nearly user order of modulation it
And decision.
8. system according to claim 7 is it is characterised in that described modulation system is current LTE
In the corresponding corresponding modulation system of order of modulation.
9. system according to claim 2 it is characterised in that described modulation bit be grouped into according to
Data after scrambling is carried out bit groupings by order of modulation.
10. system according to claim 1 is it is characterised in that include：
Remote user data and nearly user data carried out respectively scramble, modulate and layer mapping process, output layer ratio
Special group data；
The data needing to be overlapped encoding is overlapped encoding；
Data after layer bit group data/supercomposed coding is carried out with precoding, RE mapping, generates OFDM symbol
Number and launch.
11. systems according to claim 10 are it is characterised in that described supercomposed coding includes：
The remote user symbol needing to be overlapped encoding is multiplied by power factor
The nearly user symbol needing to be overlapped encoding is multiplied by power factor
Said two devices are added.
12. systems according to claim 11 are it is characterised in that also include：It is being multiplied by described work(
Before the rate factor, first constellation point adjustment is carried out to described nearly user according to the constellation point of described remote user, described
Adjustment is carried out according to the following table：
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| CN112118202A (en) * | 2019-06-21 | 2020-12-22 | 中兴通讯股份有限公司 | Base station data modulation method and device |
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