CN107026805B - The method of reseptance and device of non-orthogonal multiple access Transmission system - Google Patents
The method of reseptance and device of non-orthogonal multiple access Transmission system Download PDFInfo
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- CN107026805B CN107026805B CN201610067731.7A CN201610067731A CN107026805B CN 107026805 B CN107026805 B CN 107026805B CN 201610067731 A CN201610067731 A CN 201610067731A CN 107026805 B CN107026805 B CN 107026805B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03178—Arrangements involving sequence estimation techniques
- H04L25/03305—Joint sequence estimation and interference removal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/7103—Interference-related aspects the interference being multiple access interference
- H04B1/7105—Joint detection techniques, e.g. linear detectors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
- H04L1/0047—Decoding adapted to other signal detection operation
- H04L1/0048—Decoding adapted to other signal detection operation in conjunction with detection of multiuser or interfering signals, e.g. iteration between CDMA or MIMO detector and FEC decoder
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Abstract
The invention discloses the method for reseptances and device of a kind of non-orthogonal multiple access Transmission system, wherein this method comprises: multi-user transmission information needed for obtaining the total reception signal and N number of user's demodulating and decoding of N number of user of multiple access access channel；Select the N in N number of user1A user, and by remaining N-N1A user's receives signal as interference to total N received in signal1A user carries out combined decoding, obtains N1The combined decoding result of a user；According to N1The combined decoding of a user from total reception signal of N number of user as a result, restoring and subtracting the N being successfully decoded1' a user reception signal, and save remaining N-N1' a user total reception signal, N=N-N is set1'；Combined decoding is repeated, until N1'=N or the decoded execution number K of multi-stage combination reach preset threshold；Export the decoding result of the successful decoding user during K multi-stage combination is decoded.This method can be effectively reduced the complexity of multi-user reception, improve the performance of multi-user reception.
Description
Technical field
The present invention relates to digital information transmission technical fields more particularly to a kind of non-orthogonal multiple to access connecing for Transmission system
Receiving method and device.
Background technique
In typical mobile communication system, base station needs to communicate with multiple users in coverage area.Traditional
Multi-user's multi-upstream access uses orthogonal multiple access technique, will distribute to multiple users after channel width resource quadrature divide, from
And the signal between each user is mutually orthogonal.Orthogonal multiple access technique is realized simple, flexible.But network information opinion
It points out, when being accessed using orthogonal multiple access, reason of the joint achievable rate domain upper bound of multi-user apart from multiple access access channel capacity domain
(referred to as " theoretical circles ") has larger gap for public opinion-medium.
Using non-orthogonal multiple access technology, the signal that different user is sent directly is superimposed in base station receiving end；Correspondingly,
Base station receiving end passes through SIC (Successive Interference Cancellation, serial interference elimination) or JD
(JointDecoding, combined decoding) technology sequentially or simultaneously demodulating and decoding these superposition signal.It is typical based on folded at present
Adding the non-orthogonal multiple access technology of coding and JD technology has: LDS-MA (Low Density Signature/Spreading-
Multiple Access, the multiple access access of sparse frequency expansion sequence), SCMA (Sparse Code Multiple Access, it is sparse
The access of code multiple access), IDMA (Interleave Division Multiple Access, Interleaved partitioning scheme multiple access access) and MU-
BICMID (Multi-User Bit-Interleaved-Coded-Modulation with Iterative Decoding, repeatedly
For the Bit Interleaved Coded Modulation of Multiuser Detection).Non-orthogonal multiple access technology distinguishes difference in conjunction with the power resource of channel
User, so that the signal between the different user of same channel bandwidth resources is overlapped.Selection is suitable nonopiate more
Location access technology can make multi-user association achievable rate domain upper bound approximation theory circle.In real system, since multiple users believe
The diversity of number transmission channel, non-orthogonal multiple access technology can further be excavated multi-purpose relative to orthogonal multiple access technique
The diversity gain of family transmission.
IDMA is designed towards low signal-to-noise ratio and compared with the application scenarios of low rate.When using IDMA, different user is not by
It is distinguished with interleaving mode, therefore there are many number of users that can be accessed simultaneously.And IDMA, which approaches multiple access access channel, to be held
Measure the performance of the theoretical circles in domain.Although IDMA increases the number of users of system while access in which can dramatically, it is constrained to simplification
Receiver algorithm is only applicable to low signal-to-noise ratio region, and the transmission rate of each user is limited, each Subscriber Unit information ratio
Special operand is very big.
LDS-MA and SCMA is by using different spread spectrum patterns or spreading code this differentiation different user.Two methods are connecing
Receiving end is all made of Message Passing Algorithm (Message Passing Algorithm, MPA) algorithm and realizes that approximate maximum likelihood is more
User's detection.IDMA, LDS-MA and SCMA are that the combined coding multiple access technique of multiple access access channel (is compiled based on superposition
The multiple access technique of code and JD technology).It is noted that being mutually just between some sparse spread spectrum patterns or spread spectrum code book
It hands over, therefore when spreading pattern or spread spectrum code book negligible amounts, the scheme and performance of SCMA and LDS-MA are close to orthogonal multiple access
Access；And when spreading pattern or more spread spectrum code book quantity, the reception complexity of SCMA and LDS-MA scheme sharply increases, example
Such as, due to the processing of spread spectrum, each subscriber signal superposition number of plies for receiving symbol is caused to be multiplied.
It is one that bit-interleaved coded-modulation multiple access, which accesses (Bit-Interleaved Coded Multiple Access, BICMA),
The combined coding multiple access technique of kind multiple access access channel, is Bit Interleaved Coded Modulation technology (Bit-Interleaved
Coded Modulation) application in multi-user's supercomposed coding field.MU-BICMID is the more of BICMA multiple access technique
Subscriber-coded modulation scheme.When using MU-BICMID, pass through the coded modulation scheme and transmission power of combined optimization different user
Actual transmissions performance is set to approach the theoretical circles in multiple access access channel capacity domain, and transmission plan is suitable under multiple access access channel
The various application scenarios of high, medium and low spectrum efficiency.The basic thought of MU-BICMID is: being joined by the respective coded modulation of user
Number and transmission power distinction different user.MU-BICMID does not need spread processing, therefore under the same subscriber Signal averaging number of plies,
User load rate is higher.
Above-mentioned non-orthogonal multiple access technology and scheme based on supercomposed coding and JD technology can also make full use of multi-purpose
The difference of family transmission channel provides multi-user diversity gain, improves transmission reliability.User be superimposed the number of plies it is more, multi-user and
The capacity gain of rate is bigger, and multi-user diversity gain is higher.But be limited to user's transmission demand and receive complexity, it is existing
There is the superposition number of users of scheme limited.
On the other hand, SIC receiver is usually used in receiving the access transmission of the supercomposed coding non-orthogonal multiple based on multi-layer coding
System.SIC technology needs the signal for multiple users that successively demodulating and decoding is overlapped mutually, and successively eliminates demodulating and decoding user
Interference of the signal to subsequent user signal, therefore the priority of different user signal is different.Based on supercomposed coding and SIC skill
The non-orthogonal multiple access technology and scheme of art since successively demodulating and decoding eliminates the signal of each layer of user, receive complexity compared with
It is small, but certain points on multiple access access channel capacity domain boundary can only be approached in primary transmission, and there are reception delays and mistake
The problem of misfeed.
For channel there are probabilistic multiple access access Transmission system, receiver using JD technology be it is optimal, to base
It is applicable in the supercomposed coding non-orthogonal multiple of combined coding and multi-layer coding access Transmission system.But when user is superimposed number of plies mistake
Gao Shi is simple to be significantly improved using the Receiver Complexity of JD technology.And it is connect using the received non-orthogonal multiple of SIC technology merely
Enter system, there are problems that reception delay and error propagation, and transmission performance is remarkably decreased because of the uncertainty of channel.
Therefore there are JD to receive the select permeability with SIC reception scheme for the receiver of non-orthogonal multiple access system, meanwhile,
There are problems that the compromise of decoding complex degree and decoding performance.
Summary of the invention
The purpose of the present invention is intended to solve above-mentioned one of technical problem at least to a certain extent.
For this purpose, the first purpose of this invention is to propose a kind of method of reseptance of non-orthogonal multiple access Transmission system,
This method is capable of the transmission information of every grade of demodulating and decoding one or more user and carries out interference elimination, can be effectively reduced multi-purpose
The received complexity in family, improves the performance of multi-user reception, and the multi-user's supercomposed coding for sufficiently excavating multiple access access channel is brought
Capacity gain and diversity gain.
Second object of the present invention is to propose a kind of reception device of non-orthogonal multiple access Transmission system.
In order to achieve the above object, first aspect present invention embodiment proposes a kind of connecing for non-orthogonal multiple access Transmission system
Receiving method, comprising the following steps: S1, total reception signal of N number of user of acquisition multiple access access channel and N number of user
Multi-user transmission information needed for demodulating and decoding, and initialize the decoded execution number K=0 of multi-stage combination, wherein it is the multiple
Total reception signal of user is the signal for being superimposed interference and noise, and N is positive integer, and K is natural number；S2 is selected described N number of
N in user1A user, and by remaining N-N1A user's receives signal as interference to total N received in signal1
A user carries out combined decoding, obtains the N1The combined decoding of a user is as a result, and be arranged that the multi-stage combination is decoded to be held
Row number K=K+1, wherein 0 < N1≤N；S3, according to the N1The combined decoding of a user is as a result, from the total of N number of user
It receives and restores in signal and subtract the N being successfully decoded1' a user reception signal, and save remaining N-N1' a user always connects
N=N-N is arranged in the collection of letters number1', wherein it is described to be successfully decoded including decoding result is correct or decoding result convergence；S4, repetition are held
The row step S2 and step S3, until N1'=N or the decoded execution number K of the multi-stage combination reach preset threshold；
S5 exports the decoding result of the successful decoding user during K multi-stage combination is decoded.
The method of reseptance of non-orthogonal multiple access Transmission system according to an embodiment of the present invention, obtains always connecing for N number of user
The multi-user transmission information that the collection of letters number and N number of user's demodulating and decoding need, by N-N1The reception signal of a user as interference with
To total N received in signal1A user carries out combined coding and obtains N1The combined decoding of a user is as a result, according to combined decoding knot
Fruit is correct or restrains, and restores from total reception signal of N number of user and subtracts the N being successfully decoded1' a user reception signal,
And save remaining N-N1' a user total reception signal, N=N-N is set1'；Combined decoding is repeated, until N1'=N or multistage
The execution number K of combined decoding reaches preset threshold, exports the solution of the successful decoding user during K multi-stage combination is decoded
Code result.This method is capable of the transmission information of every grade of demodulating and decoding one or more user and carries out interference elimination, can be effective
The complexity for reducing multi-user reception, improves the performance of multi-user reception, sufficiently excavates multi-user's superposition of multiple access access channel
Encode bring capacity gain and diversity gain.
In one embodiment of the invention, the multi-user transmission information includes the number for being superimposed user, each user
The coded modulation scheme of the channel state information of data-signal and each user data signal.
In one embodiment of the invention, the step S2, comprising: S21, according to each user data signal
Channel state information and coded modulation scheme select the N from N number of user1A user；S22, by the N-N1A user
Receive signal as interference signal with the N to total reception signal1A user carries out combined coding, obtains the N1A use
The combined decoding at family is as a result, and be arranged the decoded execution number K=K+1 of the multi-stage combination.
In one embodiment of the invention, when the transmission rate of N number of user under the same conditions, the step
S21 includes: to calculate N number of user according to the channel state information of each user data signal respectively to assume to be applied alone
Channel capacity when family is transmitted；N number of user is ranked up from big to small by the channel capacity, and selects the channel
The maximum preceding N of capacity1A user.
In one embodiment of the invention, when the transmission rate of N number of user under different conditions, the step
S21 includes: to be appointed from N number of user according to the channel state information and coded modulation scheme of each user data signal
Meaning selects the N1A user.
In order to achieve the above object, second aspect of the present invention embodiment proposes a kind of connecing for non-orthogonal multiple access Transmission system
Receiving apparatus, comprising: obtain module, for obtain multiple access access channel N number of user total reception signal and N number of use
Multi-user transmission information needed for the demodulating and decoding of family, and initialize the decoded execution number K=0 of multi-stage combination, wherein it is described more
Total reception signal of a user is the signal for being superimposed interference and noise, and N is positive integer, and K is natural number；Decoder module is used
N in selection N number of user1A user, and by remaining N-N1The reception signal of a user is as interference always to connect to described
The N in the collection of letters number1A user carries out the combined coding, obtains the N1The combined decoding of a user is as a result, and be arranged institute
State the decoded execution number K=K+1 of multi-stage combination, wherein 0 < N1≤N；Interference cancellation module, for according to the N1A user
Combined decoding as a result, restoring from total reception signal of N number of user and subtracting the N being successfully decoded1' a user reception
Signal, and save remaining N-N1' a user total reception signal, N=N-N is set1', wherein it is described to be successfully decoded including decoding
As a result correct or decoding result convergence, and the decoder module and interference cancellation module are repeated, until N1'=N or institute
It states the decoded execution number K of multi-stage combination and reaches preset threshold；Output module, for exporting in the decoded mistake of K multi-stage combination
The decoding result of successful decoding user in journey.
The reception device of non-orthogonal multiple access Transmission system according to an embodiment of the present invention, obtains module and obtains N number of use
The multi-user transmission information that total reception signal at family and N number of user's demodulating and decoding need, decoder module is by N-N1A user's connects
The collection of letters number is as interference to receive the N selected in signal to total1A user carries out combined decoding and obtains N1The joint solution of a user
Code is as a result, interference cancellation module is restored and subtracted from total reception signal of N number of user according to combined decoding result is correct or convergence
Remove the N being successfully decoded1' a user reception signal, and save remaining N-N1' a user total reception signal, N=N- is set
N1', combined decoding is repeated, until N1'=N or the decoded execution number K of multi-stage combination reach preset threshold, and output module is defeated
Out in the decoding result of the decoded successful decoding user in the process of K multi-stage combination.The device can be every grade demodulating and decoding one
Or multiple users transmission information and carry out interference elimination, can be effectively reduced the complexity of multi-user reception, improve multi-user
Received performance sufficiently excavates the multi-user's supercomposed coding bring capacity gain and diversity gain of multiple access access channel.
In one embodiment of the invention, the multi-user transmission information includes: the number for being superimposed user, each user
The coded modulation scheme of the channel state information of data-signal and each user data signal.
In one embodiment of the invention, the decoder module includes: selecting unit, for according to each user
The channel state information and coded modulation scheme of data-signal select the N from N number of user1A user；Decoding unit,
For by the N-N1A user's receives signal as interference signal to total N received in signal1A user into
Row combined decoding obtains the N1The combined decoding of a user is as a result, and be arranged the decoded execution number K=of the multi-stage combination
K+1。
In one embodiment of the invention, when the transmission rate of N number of user under the same conditions, the selection is single
Member is specifically used for: calculating N number of user according to the channel state information of each user data signal and respectively assumes to carry out
Channel capacity when single user is transmitted；N number of user is ranked up from big to small by the channel capacity, and described in selection
The maximum preceding N of channel capacity1A user.
In one embodiment of the invention, when the transmission rate of N number of user under different conditions, the selection is single
Member is specifically used for: according to the channel state information of each user data signal and coded modulation scheme from N number of user
In arbitrarily select the N1A user.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect and advantage of the invention will become from the following description of the accompanying drawings of embodiments
Obviously and it is readily appreciated that, wherein
Fig. 1 is the flow chart that the method for reseptance of Transmission system is accessed according to the non-orthogonal multiple of one embodiment of the invention；
Fig. 2 is the flow chart according to the combined coding process of one embodiment of the invention；
Fig. 3 is the emulation that the method for reseptance of Transmission system is accessed according to the non-orthogonal multiple of one specific embodiment of the present invention
As a result exemplary diagram；
Fig. 4 is according to the imitative of the method for reseptance of the non-orthogonal multiple access Transmission system of another specific embodiment of the invention
The exemplary diagram of true result；
Fig. 5 is according to the imitative of the method for reseptance of the non-orthogonal multiple access Transmission system of another specific embodiment of the invention
The exemplary diagram of true result；
Fig. 6 is the structural representation that the reception device of Transmission system is accessed according to the non-orthogonal multiple of one embodiment of the invention
Figure.
Specific embodiment
Embodiments herein is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the application, and should not be understood as the limitation to the application.
Convenient for subsequent descriptions, some nouns of the present invention are briefly described as follows.
Base station: multiple access accesses control terminal and the receiving end of channel.
Channel: unless otherwise specified, the present invention refers in particular to multiple access access channel.Multiple access access channel occupancy when, frequency, sky,
The sign resources of code domain are referred to as channel width resource, and multiple access accesses channel and is referred to as channel in the power that base station receiving end receives signal
Power resource.If receiving the superposition that signal is multiple subscriber signals, illustrate that channel power resource is shared by multiple users.
BTU Basic Transmission Unit: refering in particular to the basic unit of the channel width resource accessed for uplink multi-address, and basic transmission is single
Member is the RB (Resource block, resource block) being made of RE (Resource Element, resource particle), can be time domain
Any combination of symbol, subcarrier in frequency domain symbol, airspace symbol, code domain symbol or time-frequency idle bit domain symbol.
Below with reference to the accompanying drawings the method for reseptance and device of the non-orthogonal multiple access Transmission system of the embodiment of the present invention are described.
Fig. 1 is the flow chart that the method for reseptance of Transmission system is accessed according to the non-orthogonal multiple of one embodiment of the invention.
As shown in Figure 1, the method for reseptance of non-orthogonal multiple access Transmission system may comprise steps of:
S1 is obtained more needed for the total reception signal and N number of user's demodulating and decoding of N number of user of multiple access access channel
User transmits information, and initializes the decoded execution number K=0 of multi-stage combination, wherein N is positive integer, and K is natural number.
It is appreciated that in an embodiment of the present invention, total reception signal of multiple user is to be superimposed interference and noise
Signal.
It should be noted that being connect for the fixation for thering is the scheduling access of Dedicated Signaling Channel and multi-user transmission condition to determine
Enter, multi-user transmission information can be provided by the signaling and control module of base station；For directly transmitting the road data-signal Huo Yousui
The random access of signaling, multi-user transmission information can be accessed the pilot tone letter that each user data signal is corresponded in channel by multiple access
Number carrying out demodulating and decoding obtains.
It should also be noted that, in an embodiment of the present invention, multi-user transmission information includes the number for being superimposed user, every
The coded modulation scheme of the channel state information of a user data signal and each user data signal.Wherein, coded modulation mould
Formula includes channel coding, Bit Interleave, constellation mapping and constellation symbol spread spectrum pattern or spread spectrum code book.
More specifically, the data-signal of each user can generate in the following manner in transmitting terminal: user information ratio
Spy obtains coded-bit by channel coding, and coded-bit obtains interleaving bits by Bit Interleave, and interleaving bits pass through constellation
Mapping obtains constellation symbol, then obtains base band by spread processing and sends symbol.
S2 selects the N in N number of user1A user, and by N-N1A user receives signal as interference to receive letter to total
N in number1A user carries out combined decoding, obtains N1The combined decoding of a user is as a result, and be arranged the decoded execution of multi-stage combination
Number K=K+1, wherein 0 < N1≤N。
In addition, N1It may be the same or different during executing step S2 each time, that is to say, that N1Numerical value
It can change.
It should be noted that selecting N from N number of user every time1A user can be by the control of the signaling and control module of base station
System.
Specifically, in one embodiment of the invention, as shown in Fig. 2, selecting the N in N number of user1A user, and
By N-N1A user's receives signal as interference to total N received in signal1A user carries out combined decoding, obtains N1It is a
The specific implementation process of the combined decoding result of user, i.e. step S2 may include:
S21 selects N from N number of user according to the channel state information of each user data signal and coded modulation scheme1
A user.
In one embodiment of the invention, when the transmission rate of N number of user under the same conditions, step S21 can wrap
It includes: letter when N number of user respectively assumes progress single user transmission is calculated according to the channel state information of each user data signal
Road capacity；N number of user is ranked up from big to small by channel capacity, and selects the maximum preceding N of channel capacity1A user.
In another embodiment of the present invention, when the transmission rate of N number of user under different conditions, step S21 can be with
It include: that N is arbitrarily selected from N number of user according to the channel state information and coded modulation scheme of each user data signal1It is a
User.
For example, if setting N1=1, then select any 1 user in N number of user；Or if setting N1=2, then
Select any 2 users in N number of user；And so on, or if setting N1=N then selects all users to carry out multi-user
Combined decoding.More specifically, by base station signaling and control module control, step is being performed a plurality of times to same N number of user
When rapid S2, not exactly the same N is selected every time1A user.
S22, by N-N1A user's receives signal as interference signal to total N received in signal1A user joins
Decoding is closed, N is obtained1The combined decoding of a user is as a result, and be arranged the decoded execution number K=K+1 of multi-stage combination.
It should be noted that the N of selection1A user carries out combined decoding, works as N1When=1, refer to N1A user carries out
Single user demodulating and decoding, work as N1When > 1, refer to N1The multi-user association demodulating and decoding that a user carries out.It may be said that being applied alone
Family demodulating and decoding and multi-user association demodulating and decoding are the concrete operations of combined decoding module.
As can be seen that can will execute number K whenever carrying out a combined decoding and add 1, and continue to execute subsequent step,
That is step S3.
S3, according to N1The combined decoding of a user from total reception signal of N number of user as a result, restore and subtract successfully to solve
The N of code1' a user reception signal, and save remaining N-N1' a user total reception signal, N=N-N is set1'。
Wherein, in an embodiment of the present invention, this, which is successfully decoded, can be regarded as including that decoding result is correct or decoding result
Convergence.
Specifically, the N that can be obtained according to step S21The combined decoding of a user is as a result, from N1Selection decoding knot in a user
Fruit is correct or the convergent N of decoding result1' a user carries out receiving signaling protein14-3-3 and elimination.Wherein, N1'=0 indicates not solve
Result is correct or the convergent user of decoding result for code, total reception signal of the N number of user stored before can retaining at this time.
That is, can be according to N1The combined decoding result of a user restores N1' a respective reception signal of user, and from
It is total to receive the N that recovery is subtracted in signal1' a user reception signal, be superimposed the N-N of interference and noise1' it is a other use
Total reception signal at family simultaneously saves, and N=N-N is arranged1', and repeat step S2 and step S3.
S4 judges N1' whether it is equal to whether the N or decoded execution number K of multi-stage combination reaches preset threshold.
Specifically, if N1' be equal to the N or decoded execution number K of multi-stage combination reach preset threshold, then execute step
Rapid S5.It is appreciated that working as N1When '=N or the decoded execution number K of multi-stage combination reach preset threshold, terminate multi-stage combination
Decoding, and continue to execute step S5.
If N1' be not up to preset threshold not equal to the N or decoded execution number K of multi-stage combination, then return step
S2。
S5 exports the decoding result of the successful decoding user during K multi-stage combination is decoded.
That is, in each secondary step S2 for carrying out of output, decoding result is correct or the convergent user of decoding result
Decoding result terminates receiver decoding.
The method of reseptance of non-orthogonal multiple access Transmission system according to an embodiment of the present invention, obtains always connecing for N number of user
The multi-user transmission information that the collection of letters number and N number of user's demodulating and decoding need, by remaining N-N1The reception signal of a user is as dry
It disturbs to receive the N selected in signal to total1A user carries out combined decoding and obtains N1The combined decoding of a user is as a result, according to connection
It closes decoding result correctly or restrains, restore from total reception signal of N number of user and subtract the N being successfully decoded1' a user connects
The collection of letters number, and total reception signal of remaining users is saved, N=N-N is set1', combined decoding is repeated, until N1'=N or multistage
The execution number K of combined decoding reaches preset threshold, and it is useful to export the institute being successfully decoded during K multi-stage combination is decoded
The combined decoding result at family.This method, which is capable of the transmission information of every grade of demodulating and decoding one or more user and carries out interference, to disappear
It removes, the complexity of multi-user reception can be effectively reduced, improve the performance of multi-user reception, sufficiently excavate multiple access access channel
Multi-user's supercomposed coding bring capacity gain and diversity gain.
It is appreciated that general multiple access access channel is there are a kind of probabilistic typical scene, to may is that channel exists slow
Decline, and current channel condition information in user's transmitting terminal be it is unknown, user's transmitting terminal just knows that channel shape average for a long time
State information.Channel is accessed in user's transmitting terminal unknown slow fading multiple access to channel state information, the ergodic channels of multi-user hold
Measuring domain is 0, therefore, gives the transmission rate of user, certainly exists outage probability, alternatively, the thresholding of given outage probability, there is phase
The interruption channel capacity domain answered.
Therefore, the scene that carries out burst transfers of data is accessed under channel for slow fading multiple access, compared to multi-user association
Achievable rate is more concerned about the achievable rate of single user.According to network information opinion relevant knowledge, is combined and received using multi-layer coding
When holding the technology of serial interference elimination, single user's achievable rate domain that multiple access accesses channel single transmission is limited.Correspondingly, it adopts
When combining the technology of receiving end combined decoding with JD (Joint Coding, combined coding), multiple access accesses channel single transmission
Single user's achievable rate domain is Chong Die with theoretical achievable rate domain.
Actual non-orthogonal multiple access scheme is limited to specific multiple access technique (for example, some technologies combine
Sequence spread spectrum, compared to direct linear superposition, the achievable rate domain of multi-user association achievable rate domain and single user are not
Together), coding modulation technique (including planisphere non-gaussian distribution, channel coding code length is limited, limited performance) and multiuser decoding
Technology (for example, combined decoding and SIC decoding difference are larger, calculate by the iterative MUD number of combined decoding, Multiuser Detection
Method, channel decoding algorithms and the number of iterations etc.), cause Performance Evaluation to be difficult unanimously.
The combined coding of direct linear superposition combination transmitting terminal and the combined decoding technology of receiving end can approach multiple access and connect
Enter the transmission limit of channel, thus, it is supposed that the input signal of multiple access access channel is Gaussian Profile, using direct linear superposition knot
The combined coding of transmitting terminal and the combined decoding technology of receiving end are closed, and assumes that coding and decoding is ideal (that is, user is transmitted
Rate is fallen in achievable rate domain, then user information transmission success, otherwise, user information transmission failure), multiple access is obtained with this and is connect
Enter channel using the signal-to-noise ratio of non-orthogonal multiple access technology and the theoretical circles of outage probability.
The theoretical circles of method of reseptance difference configuration parameter based on non-orthogonal multiple of the present invention access Transmission system, illustrate base
Receiving end stand using compromise of the method for reseptance of the present invention between complexity and performance.It will be exemplified in detail below.
For example, under independent identically distributed Rayleigh block decline multiple access access channel, base station is more using single antenna reception
Total reception signal of 6 users of the superposition of channel interference and noise is accessed in location.6 users input the letter of multiple access access channel
It number is Gaussian Profile, it is assumed that ideal multi-user coding and decoding, therefore obtain nonopiate more using the present invention in the case
The method of reseptance that Transmission system is accessed in location uses Outage probability of distributed antenna when 3 kinds of different configuration parameters.Concrete configuration parameter can be as
Shown in lower:
1st kind it may is that be arranged N when first time executing step S21=6, directly all 6 users are joined
Close decoding.
2nd kind can be when first time executing step S2, and N is arranged1=5, according to the channel state information meter of step S21
The channel capacity of each user is calculated, highest 5 users of channel capacity are selected, by remaining 1 user as interference, to this
5 users carry out combined decoding；When executing step S2 later, N is set1No more than 5, i.e., no more than 5 users are carried out every time
Combined decoding.
3rd kind can be when first time executing step S2, and N is arranged1=4, according to the channel state information meter of step S21
The channel capacity of each user is calculated, highest 4 users of channel capacity are selected, by remaining 2 users as interference, to this
4 users carry out combined decoding；When executing step S2 later, N is set1No more than 4, i.e., no more than 4 users are carried out every time
Combined decoding.
Specifically, 3 kinds of different configuration parameters are used using the method for reseptance of non-orthogonal multiple of the present invention access Transmission system
Specific simulation result is as shown in Figure 3:
Wherein circle, square and diamond curve respectively represent the 1st kind, the 2nd kind and the 3rd kind situation, can from Fig. 3 simulation result
To find out, the Outage probability of distributed antenna of the 1st kind, the 2nd kind and the 3rd kind situation is successively deteriorated, but three's difference very little.But the 1st
Kind situation needs to carry out 6 users combined decodings, and the 2nd kind of situation only needs to carry out combined decodings at most 5 users, the
3 kinds of situations only need to carry out combined decoding at most 4 users, and there are many complexity decline.From analysis as can be seen that using this hair
The method of reseptance of bright non-orthogonal multiple access Transmission system, is arranged N1=4, all user's joints are directly carried out compared to receiving end
Decoding, Outage probability of distributed antenna is declined slightly, but receiving end complexity is remarkably decreased.
Further, it is connect under Urban Macro (ITU-Uma) channel of ITU organizational norms using MU-BICMID multiple access
Enter the system of scheme based on the actual performance of method of reseptance difference configuration parameter of the present invention, illustrate base station receiving end in complexity and
Compromise between performance.It will be exemplified in detail below.
For example, under ITU-Uma channel, 4 users access base using MU-BICMID multiple access schemes simultaneously
It stands, the coded modulation scheme of 4 users is identical, and transmission rate is 0.25bit/channel-use/user, and base station is using single
Antenna receives.Other specific simulation parameters are as shown in table 1 below:
1 simulation parameter of table
Base station is carried out multistage using the method for reseptance of non-orthogonal multiple of the present invention access Transmission system according to step S1-S5
Combined decoding, wherein actual parameter is as follows: when carrying out step S2, parameter N can be set1=3, and select channel capacity maximum
Preceding N1A user carries out combined decoding；When carrying out step S3, according to the combined decoding of 3 users in step S2 as a result, if
N1'≤3 are correct or decoding result is restrained with decoding result per family, then restore and eliminate this N1' the respective reception letter of a user
Number, return step S2；Otherwise, continue step S4, until N1'=N or the decoded execution number K of multi-stage combination reach default
Threshold value terminates receiver decoding.
Specifically, 4 users are using the specific simulation result of MU-BICMID multiple access schemes while access base station as schemed
Shown in 4: wherein diamond curve is that base station is matched based on the method for reseptance of non-orthogonal multiple of the present invention access Transmission system above-mentioned
Set the actual performance under parameter.Meanwhile two reference performances are given, rectangular curve is 4 users according to above-mentioned emulation item
Part and MU-BICMID scheme, but the reference performance that receiving end directly uses combined decoding technology to obtain 4 users；It is round bent
Line be 4 users be Gauss input when, using the combined coding of direct linear superposition combination transmitting terminal and the joint solution of receiving end
Code technology, theoretical performance limit in the case where ideal multi-user coding and decoding.
From simulation result as can be seen that 1 user is first considered as interference, wherein 3 users are carried out in combined decoding
Disconnected probability Performance Simulation Results are declined slightly with the simulation result for directly carrying out combined decoding to 4 users, but receiving end receives
Complexity but compares significant decrease.
Again for example, under ITU-Uma channel, 4 users access base using MU-BICMID multiple access schemes simultaneously
It stands, 4 users is allowed to be all made of the LDPC code of 1/4 code rate, transmission rate is 0.50bit/channel-use/user, Qi Tafang
True condition and parameter obtained simulation result all the same are as shown in Figure 5.
From simulation result as can be seen that 1 user is first considered as interference, wherein 3 users are carried out in combined decoding
Disconnected probability Performance Simulation Results are declined with the simulation result for directly carrying out combined decoding to 4 users, but receiving end receives
Complexity but significantly reduces.
In conclusion the method for reseptance of the non-orthogonal multiple access Transmission system of the embodiment of the present invention has below beneficial to effect
Fruit:
1) two kinds of multiple access techniques of combined coding and multi-layer coding of compatible multiple access access channel and a variety of existing schemes；
2) receiver can obtain compromise with flexible configuration parameter between complexity and transmission performance；
3) it under conditions of multiple access access channel has uncertain or coded modulation scheme limited capacity, can effectively improve
The performance of multi-layer coding multiple access access Transmission system；
4) Receiver Complexity that can effectively reduce combined coding multiple access access Transmission system, increases substantially superposition user
Number.
It is corresponding with the non-orthogonal multiple access method of reseptance of Transmission system that above-mentioned several embodiments provide, it is of the invention
A kind of embodiment also provides a kind of reception device of non-orthogonal multiple access Transmission system, due to provided in an embodiment of the present invention non-
The non-orthogonal multiple access Transmission system that the reception device and above-mentioned several embodiments of orthogonal multiple access access Transmission system provide
Method of reseptance is corresponding, therefore the embodiment of the method for reseptance in aforementioned non-orthogonal multiple access Transmission system is also applied for this
The reception device for the non-orthogonal multiple access Transmission system that embodiment provides, is not described in detail in the present embodiment.Fig. 6 is root
According to the structural schematic diagram of the reception device of the non-orthogonal multiple access Transmission system of one embodiment of the invention.As shown in fig. 6, should
The reception device of non-orthogonal multiple access Transmission system may include: to obtain module 10, decoder module 20, interference cancellation module 30
With output module 40.
Wherein, total reception signal of N number of user of the acquisition module 10 for obtaining multiple access access channel and N number of user
Multi-user transmission information needed for demodulating and decoding, and initialize the decoded execution number K=0 of multi-stage combination, wherein multiple users
Total reception signal be the signal for being superimposed interference and noise, N is positive integer, and K is natural number.
Decoder module 20 is used to select the N in N number of user1A user, and by remaining N-N1The reception signal conduct of a user
Interference is to total N received in signal1A user carries out combined decoding, obtains N1The combined decoding of a user is as a result, and be arranged more
Grade combines decoded execution number K=K+1, wherein 0 < N1≤N。
Interference cancellation module 30 is used for according to N1The combined decoding of a user is as a result, from total reception signal of N number of user
Restore and subtracts the N being successfully decoded1' a user reception signal, and save total reception signal of remaining users, N=N- be set
N1', wherein it is successfully decoded including decoding result is correct or decoding result convergence, and repeats decoder module and interference is eliminated
Module, until N1'=N or the decoded execution number K of multi-stage combination reach preset threshold.
Output module 40 is used to export the decoding result of the successful decoding user during K multi-stage combination is decoded.
In one embodiment of the invention, multi-user transmission information includes: the number for being superimposed user, each user data
The coded modulation scheme of the channel state information of signal and each user data signal.
In one embodiment of the invention, as shown in fig. 6, decoder module 20 includes: selecting unit 21 and decoding unit
22.Wherein, selecting unit 21 is used for according to the channel state information of each user data signal and coded modulation scheme from N number of use
N is selected in family1A user.Decoding unit 22 is used for N-N1The reception signal of a user is as interference signal to receive letter to total
N in number1A user carries out combined coding, obtains N1The combined decoding of a user is as a result, and be arranged the decoded execution of multi-stage combination
Number K=K+1.
Specifically, in one embodiment of the invention, when N number of user transmission rate under the same conditions, selection
When unit 21 respectively can assume to carry out single user transmission according to the N number of user of the channel state information of each user data signal calculating
Channel capacity, and N number of user is ranked up from big to small by channel capacity, and select the maximum preceding N of channel capacity1A use
Family.
In another embodiment of the present invention, when the transmission rate of N number of user under different conditions, selecting unit 21 can
N is arbitrarily selected from N number of user according to the channel state information of each user data signal and coded modulation scheme1A user.
The reception device of non-orthogonal multiple access Transmission system according to an embodiment of the present invention, obtains module and obtains N number of use
The multi-user transmission information that total reception signal at family and N number of user's demodulating and decoding need, decoder module is by N-N1A user's connects
The collection of letters number is as interference to receive the N selected in signal to total1A user carries out combined decoding and obtains N1The combined decoding of a user
As a result, interference cancellation module is correct according to combined decoding result or restrains, restores and subtract from total reception signal of N number of user
The N being successfully decoded1' a user reception signal, and save total reception signal of remaining users, N=N-N be set1', it repeats to combine
Decoding, until N1'=N or decoded execution number the K of multi-stage combination reaches preset threshold, and output module output is in K multistage
The combined decoding result for all users being successfully decoded during combined decoding.The device can every grade of demodulating and decoding one or
The transmission information of multiple users simultaneously carries out interference elimination, and the complexity of multi-user reception can be effectively reduced, and improves multi-user and connects
The performance of receipts sufficiently excavates the multi-user's supercomposed coding bring capacity gain and diversity gain of multiple access access channel.
In the description of the present invention, it is to be understood that, term " first ", " second " are used for description purposes only, and cannot
It is interpreted as indication or suggestion relative importance or implicitly indicates the quantity of indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include at least one of the features.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (4)
1. a kind of method of reseptance of non-orthogonal multiple access Transmission system, which comprises the following steps:
S1 is obtained more needed for the total reception signal and N number of user's demodulating and decoding of N number of user of multiple access access channel
User transmits information, and initializes the decoded execution number K=0 of multi-stage combination, wherein total reception signal of N number of user
For the signal for being superimposed interference and noise, N is positive integer, and K is natural number；
S2 selects the N in N number of user1A user, and by remaining N-N1The reception signal of a user is as interference to institute
State total N received in signal1A user carries out combined decoding, obtains the N1The combined decoding of a user is as a result, and be arranged
The decoded execution number K=K+1 of multi-stage combination, wherein 0 < N1≤N；
S21 selects institute from N number of user according to the channel state information of each user data signal and coded modulation scheme
State N1A user；
When N number of user transmission rate under the same conditions, the step S21 includes:
N number of user is calculated according to the channel state information of each user data signal respectively to assume to carry out single user biography
Channel capacity when defeated；
N number of user is ranked up from big to small by the channel capacity, and selects the maximum preceding N of the channel capacity1It is a
User；
When N number of user transmission rate under different conditions, the step S21 includes:
It is arbitrarily selected from N number of user according to the channel state information of each user data signal and coded modulation scheme
Select the N1A user；
S22, by the N-N1A user's receives signal as interference to total N for receiving signal1A user carries out
Combined decoding obtains the N1The combined decoding of a user is as a result, and be arranged the decoded execution number K=K+ of the multi-stage combination
1；
S3, according to the N1The combined decoding of a user is as a result, restoring and subtracting into from total reception signal of N number of user
The decoded N of function1' a user reception signal, and save remaining N-N1' a user total reception signal, N=N-N is set1',
In, it is described to be successfully decoded including decoding result is correct or decoding result convergence；
S4 repeats the step S2 and step S3, until N1'=N or the decoded execution number K of the multi-stage combination reach
To preset threshold；
S5 exports the decoding result of the successful decoding user during K multi-stage combination is decoded.
2. the method for reseptance of non-orthogonal multiple access Transmission system as described in claim 1, which is characterized in that wherein, described
Multi-user transmission information includes being superimposed the number of user, the channel state information of each user data signal and described each
The coded modulation scheme of user data signal.
3. a kind of reception device of non-orthogonal multiple access Transmission system characterized by comprising
Module is obtained, the total reception signal and N number of user for obtaining N number of user of multiple access access channel are solved and reconciled
Multi-user transmission information needed for code, and initialize the decoded execution number K=0 of multi-stage combination, wherein N number of user's
Total signal that receives is the signal for being superimposed interference and noise, and N is positive integer, and K is natural number；
Decoder module, for selecting the N in N number of user1A user, and by remaining N-N1The reception signal conduct of a user
Interference is to total N received in signal1A user carries out the combined decoding, obtains the N1The joint of a user
Decoding result, and the decoded execution number K=K+1 of the multi-stage combination is set, wherein 0 < N1≤N；
The decoder module includes:
Selecting unit, for according to the channel state information of each user data signal and coded modulation scheme from N number of use
The N is selected in family1A user；
When N number of user transmission rate under the same conditions, the selecting unit is specifically used for:
N number of user is calculated according to the channel state information of each user data signal respectively to assume to carry out single user biography
Channel capacity when defeated；
N number of user is ranked up from big to small by the channel capacity, and selects the maximum preceding N of the channel capacity1It is a
User；
When N number of user transmission rate under different conditions, the selecting unit is specifically used for:
It is arbitrarily selected from N number of user according to the channel state information of each user data signal and coded modulation scheme
Select the N1A user
Decoding unit is used for the N-N1The reception signal of a user is as interference signal in total reception signal
The N1A user carries out combined decoding, obtains the N1The combined decoding of a user is as a result, and be arranged the multi-stage combination decoding
Execution number K=K+1；
Interference cancellation module, for according to the N1The combined decoding of a user is as a result, from total reception signal of N number of user
Middle recovery simultaneously subtracts the N being successfully decoded1' a user reception signal, and save remaining N-N1' a user total reception signal, if
Set N=N-N1', wherein it is described to be successfully decoded including decoding result is correct or decoding result convergence, and repeat the decoding
Module and interference cancellation module, until N1'=N or the decoded execution number K of the multi-stage combination reach preset threshold；
Output module, for exporting the decoding result of the successful decoding user during K multi-stage combination is decoded.
4. the reception device of non-orthogonal multiple access Transmission system as claimed in claim 3, which is characterized in that wherein, described
Multi-user transmission information includes: to be superimposed the number of user, the channel state information of each user data signal and described every
The coded modulation scheme of a user data signal.
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