CN107171770A - Uplink multi-users non-orthogonal multiple cut-in method - Google Patents
Uplink multi-users non-orthogonal multiple cut-in method Download PDFInfo
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- CN107171770A CN107171770A CN201710380468.1A CN201710380468A CN107171770A CN 107171770 A CN107171770 A CN 107171770A CN 201710380468 A CN201710380468 A CN 201710380468A CN 107171770 A CN107171770 A CN 107171770A
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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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
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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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- 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
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0071—Use of interleaving
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Abstract
The invention discloses a kind of uplink multi-users non-orthogonal multiple cut-in method, the uplink multi-users non-orthogonal multiple cut-in method includes sending end signal generation process and receiving end signal decoding process, and the transmission end signal, which produces process, to be included：Channel coding is carried out to information to be transmitted and Bit Interleave obtains total interleaving bits；Constellation mapping is carried out to total interleaving bits and obtains constellation mapping symbol；The constellation mapping symbol is mapped to by resource particle according to signature pattern, wherein, the signature pattern is that density can adjust and not have repeated characteristic between corresponding symbol of signing, the mode or Bit Interleave for distinguishing different transmitting terminals are different, either signature pattern is different or Bit Interleave is different with signature pattern.One aspect of the present invention, with reference to different Bit Interleaves, user is distinguished by using the adjustable signature pattern of density；On the other hand, cancel and do not have repeated characteristic between the spread spectrum feature of signature, that is, corresponding symbol of signing.
Description
Technical field
The present invention relates to digital information transmission technical field, more particularly to a kind of uplink multi-users non-orthogonal multiple access side
Method.
Background technology
In typical GSM, base station needs to be communicated with multiple users in coverage, up many
The channel model of user's transmission accesses channel, abbreviation access channel for uplink multi-address.Traditional uplink multi-users transmission is using just
Multiple access technology is handed over, multiple users will be distributed to after channel width resource quadrature divide, so that, the transmission signal between each user is
Mutually orthogonal.Random access channel is accessed to channel condition and user, contributes to excavate many using non-orthogonal multiple technology
Power gain and diversity gain that subscriber signal stacked tape comes.In non-orthogonal multiple technology, the signal that different user is sent is in base
Receiving terminal of standing directly is superimposed, correspondingly, and base station receiving terminal passes through SIC (Successive Interference
Cancellation, serial interference elimination) or Turbo-JD (Turbo Joint Decoding, iterative joint decoding) technology according to
Secondary or joint demodulation decodes the signal of these superpositions.
3G (Third Generation) Moblie (3G) is transmitted using DS CDMA (DS-CDMA) as uplink multi-users
Multiple access technology, the signal to be transmitted of different user obtains sending signal by DSSS, i.e.,：
yi=xi*[ai,1,ai,2,…,ai,k],
Wherein, xiFor user i symbol to be transmitted, it is assumed that length is 1 code element (Chip), [ai,1,ai,2,…,ai,k] be
User i length is k frequency expansion sequence (Spreading Sequence), spread spectrum pattern (Spreading Pattern) or signs
Name (Signature), yiThe Direct Sequence Spread Spectrum Signal for being k for length, length is k code element, takes a resource particle
(Resource Element).With reference to shown in Fig. 1, a resource particle includes 4 code elements, and spreading sequence length is 4,4 expansions
Frequency sequence [ai,1,ai,2,…,ai,k], i=1,2,3,4, the accurate orthogonal multiple access of 4 users is supported, user load rate is 4 (users
Number)/4 (code element number)=100%.To DS-CDMA multiple access technologies, uplink user transmitting terminal is distinguished by different frequency expansion sequences and used
Family, the cross correlation being typically different between frequency expansion sequence is relatively low, meets quasi- orthogonality condition.Base station receiving terminal is to user using reference
Frequency expansion sequence is demodulated, therefore, and traditional DS-CDMA may be considered a kind of quasi- orthogonal multiple access techniques.
There is scholar to point out, in DS-CDMA systems, different user uses quasi-orthogonal frequency expansion sequence, causes frequency expansion sequence
Multi-user interference (Multi-User Interference) or multi-access inference are still had after demodulation between different user signal
(Multiple-Access Interference), and the specific manifestation of this multi-access inference exactly non-orthogonal multiple.Therefore,
Using the DS-CDMA technologies of appropriate frequency expansion sequence closer to non-orthogonal multiple technology.Specifically, it is higher using cross correlation
Frequency expansion sequence, multi-user's multi-upstream access can be further lifted with reference to the DS-CDMA systems of receiving terminal SIC or Turbo-JD technology
Total spectrum efficiency, and can excavate multiple user signals superposition power gain and diversity gain.Meanwhile, select higher mutual
The frequency expansion sequence of closing property can be obviously improved user load rate to support more multi-upstream access users.For example, frequency expansion sequence is long
Spend for k, select 2*k frequency expansion sequence, can support to access while 2*k uplink user.
As the DS-CDMA technologies of non-orthogonal multiple technology, there are the following problems in actual use：
1st, the complexity of frequency expansion sequence despreading and serial interference elimination is directly directly proportional to spreading sequence length, long spread spectrum sequence
Row directly result in high reception complexity；
2nd, usual frequency expansion sequence is the sequence of real numbers that+1/-1 is constituted, and limits the design of frequency expansion sequence set, also limit
User load rate；
3rd, limited by the high superposition number of users of each code element, traditional DS-CDMA systems can not be using iterative joint decoding
Technology, under conditions of channel condition and user's access are random, the performance of multi-user's multi-upstream access drastically deteriorates.
On the one hand, there is scholar to propose multiple users share access technology (Multi-User Shared Access) technology, adopt
With frequency expansion sequence of the short sequence of complex numbers as uplink user, different user is made a distinction by short sequence of complex numbers, overcomes tradition
DS-CDMA technology frequency expansion sequence length and the simple shortcoming of frequency expansion sequence.But, MUSA technologies all belong to as DS-CDMA technologies
In high density (High Density) spread spectrum, the number of users of single code element superposition is equal with multi-upstream access number of users, limitation
The application of iterative joint decoding technique.
On the other hand, there is scholar to propose low-density and spread/sign multiple access technology (Low Density Spreading/
Signature Multiple Access) technology, the frequency expansion sequence of uplink user, different user are used as using low-density signature
Made a distinction by low-density signature, overcome traditional DS-CDMA technologies frequency expansion sequence length and single code element superposition number of users is more
Significant drawback.With reference to shown in Fig. 2, a resource particle includes 4 code elements, and LDS-MA is respectively that 6 users select 6 differences
Low-density signature, i.e., [1,1,0,0], [1,0,1,0], [1,0,0,1], [0,1,1,0], [0,1,0,1] and [0,0,1,1],
The density that unique user takes code element is 2/4=50%.Wherein, 6 low-density signatures have 3 pairs of pairwise orthogonals.Used with Fig. 1
DS-CDMA technologies are compared, and user load rate is from 100% lifting to 150%, and the superposition number of users of each code element is reduced to from 4
3。
LDS-MA technologies still have following problem in actual use：
1st, low-density signature (i.e. frequency expansion sequence) corresponding value is usually 0 or 1, and the quantity of low-density signature is by low close
The limitation of feature is spent, causes user load rate during signature short and low-density to be limited.
2nd, due to may be orthogonal between two multi-user's low-density signature, i.e., interrelated coefficient may be 0, therefore,
When user load rate is relatively low, LDS-MA technologies may be equivalent to orthogonal multiple access techniques.
3rd, the spread spectrum feature of low-density signature is equivalent to symbol duplication code, causes the Multiuser Detection in a resource particle
Performance is restricted, and also results in the capacitance loss of iterative joint solution code system, is unfavorable for the excellent of multi-user coding modulation scheme
Change.
4th, the Multiuser Detection in a resource particle can not ensure transmission reliability, and therefore, LDS-MA technologies need letter
Road coding auxiliary, it is contemplated that the spread spectrum repeated characteristic of low-density signature, therefore, it is very low multi-purpose that traditional LDS-MA is equivalent to code check
Family code modulation system, causes the complexity of single code element Multiuser Detection under high spectrum efficiency drastically to raise.
5th, actual LDS-MA technologies use MPA (Message Passing Algorithm, Message Passing Algorithm) algorithm
The Multiuser Detection in a resource particle is carried out, is entered using the channel coding that design is transmitted towards single user with Multiuser Detection
Row iteration is decoded, its iterative decoding limited performance, it is impossible to compiled towards a variety of channel conditions and user's access conditions optimization multi-user
Code modulation scheme.
There is scholar to propose sparse CDMA (Sparse Code Multiple Access, SCMA) technology, by information ratio
Spy is mapped directly into the corresponding higher-dimension symbol of low-density signature of a resource particle, changes LDS-MA spread spectrum feature, carries
The Multiuser Detection performance in a resource particle is risen.But, other problems still have to be solved.
The content of the invention
It is contemplated that at least solving one of technical problem in above-mentioned correlation technique to a certain extent.
Therefore, it is an object of the present invention to propose a kind of uplink multi-users non-orthogonal multiple cut-in method.This is up
Multi-user's non-orthogonal multiple cut-in method overcomes multiple defects of traditional LDS-MA technologies.
To achieve these goals, the invention discloses a kind of uplink multi-users non-orthogonal multiple cut-in method, it is described on
Row multi-user's non-orthogonal multiple cut-in method includes sending end signal generation process and receiving end signal decoding process, the transmission
End signal, which produces process, to be included：Channel coding is carried out to information to be transmitted and Bit Interleave obtains total interleaving bits；To described total
Interleaving bits carry out constellation mapping and obtain constellation mapping symbol；The constellation mapping symbol is mapped to by resource according to signature pattern
Particle, wherein, the signature pattern is that density can adjust and not have repeated characteristic, area between corresponding symbol of signing
Either Bit Interleave is different or signature pattern is different for the mode of not different transmitting terminals, or Bit Interleave and signature pattern it is equal
It is different.
According to the uplink multi-users non-orthogonal multiple cut-in method of the present invention, the multiple of traditional LDS-MA technologies are overcome to lack
Fall into.On the one hand, with reference to different Bit Interleaves, user is distinguished by using the adjustable signature pattern of density, low user is improved
Cross correlation under the conditions of load factor between different user signature pattern, it is ensured that the nonopiate superposition of multi-user's multi-upstream access is special
Levy, the superposition number of users of single code element can be maintained under the conditions of high, normal, basic different user load factor, maintain receiving terminal by code element
The complexity of Multiuser Detection；On the other hand, cancel and not having between the spread spectrum feature of signature, that is, corresponding symbol of signing
Repeated characteristic, therefore, it can design the higher multi-user coding modulating system of code check, significantly reduces single code element under high spectrum efficiency
The complexity of Multiuser Detection；For example, to spectral efficient scene, channel coding can be redesigned, to ensure iterative joint solution
The non-orthogonal multiple performance of code, promotes the external information between the channel decoding by code element Multiuser Detection and each user to transmit.
In addition, uplink multi-users non-orthogonal multiple cut-in method according to the above embodiment of the present invention can also have it is as follows
Additional technical characteristic：
Further, including：Cascaded channel coding is carried out to information to be transmitted and cascade Bit Interleave obtains total friendship
Knit bit.
Further, it is specially：Outer channel coding is carried out to the information to be transmitted and outer Bit Interleave obtains outer intertexture
The outer interleaving bits are carried out interior channel coding, bit groupings and group Nepit intertexture and obtain total interleaving bits by bit.
Further, the interior channel coding is irregular repeated encoding, wherein, the irregular repeated encoding is difference
The number of repetition of information bit is different.
Further, described group of Nepit weaving length is much smaller than outer Bit Interleave length.
Further, the different transmitting terminal of described group of different Nepits intertexture correspondence.
Further, the receiving end signal decoding process includes：The docking collection of letters number carries out mode detection and a channel estimation,
Multi-user transmission information is obtained, wherein, the reception signal includes resource particle；According to multi-user transmission information, with reference to multi-purpose
Multiple resource particles are carried out MPA algorithm iterations, obtain the outer intertexture of multiple resource particles by the prior information of outdoor interleaving bits
The external information of bit, the prior information of the outer coding bit of multiple users is obtained through outer than deinterleave, wherein, channel decoding
The outer interleaving bits prior information of the multi-user of feedback is initialized as zero；Prior information progress to the outer coding bit of multi-user is outer
Channel is decoded, and obtains the external information of the outer coding bit of multi-user；Detect whether to reach maximum iteration or demodulating and decoding into
Work(, if it is, output information estimated value, if it is not, then according to outer Bit Interleave, utilizing the outer coding ratio of multi-user
Special external information obtains the prior information of the outer interleaving bits of multi-user, re-starts MPA algorithm iterations.
Further, the receiving end signal decoding process includes：The docking collection of letters number carries out mode detection and a channel estimation,
Multi-user transmission information is obtained, the reception signal includes resource particle；It is anti-with reference to channel decoding according to multi-user transmission information
The interleaved multi-user bit prior information of feedback, carries out obtaining interleaved multi-user bit by code element Multiuser Detection to resource particle
External information, through always than obtaining the prior information of multi-user coding bit after deinterleave, wherein, the multi-user of channel decoding feedback
Interleaving bits prior information is initialized as zero；Prior information to each subscriber-coded bit carries out channel decoding, obtains each
The external information of subscriber-coded bit；Detect whether to reach maximum iteration or demodulating and decoding success, if it is, output information
Estimated value, if it is not, then according to total Bit Interleave, interleaved multi-user is obtained using the external information of multi-user coding bit
The prior information of bit, is re-started by code element Multiuser Detection.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become from description of the accompanying drawings below to embodiment is combined
Substantially and be readily appreciated that, wherein：
Fig. 1 is DS-CDMA schematic diagrames；
Fig. 2 is LDS-MA schematic diagrames；
Fig. 3 is the transmission end signal production of uplink multi-users non-orthogonal multiple cut-in method according to an embodiment of the invention
The flow chart of raw process；
Fig. 4 is cascaded channel coding and cascade Bit Interleave and its equivalent diagram；
Fig. 5 is the check matrix schematic diagram of irregular duplication code；
Fig. 6 is the signature schematic diagram of different densities；
Fig. 7 is the receiving end signal solution of uplink multi-users non-orthogonal multiple cut-in method according to an embodiment of the invention
Code process flow diagram flow chart；
Fig. 8 is the receiving end signal solution of uplink multi-users non-orthogonal multiple cut-in method according to an embodiment of the invention
Code process schematic；
Fig. 9 is the receiving end signal of uplink multi-users non-orthogonal multiple cut-in method in accordance with another embodiment of the present invention
Decoding process flow chart；And
Figure 10 is the receiving terminal letter of uplink multi-users non-orthogonal multiple cut-in method in accordance with another embodiment of the present invention
Number decoding process schematic diagram.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.
Uplink multi-users non-orthogonal multiple cut-in method according to embodiments of the present invention is described below in conjunction with accompanying drawing.
Fig. 3 is the transmission end signal production of uplink multi-users non-orthogonal multiple cut-in method according to an embodiment of the invention
The flow chart of raw process.
Uplink multi-users non-orthogonal multiple cut-in method according to an embodiment of the invention, including：
Uplink multi-users non-orthogonal multiple cut-in method includes sending end signal generation process and receiving end signal was decoded
Journey, includes as shown in figure 3, sending end signal and producing process：
S1：Channel coding is carried out to information to be transmitted and Bit Interleave obtains total interleaving bits.
In certain embodiments, including：Cascaded channel coding is carried out to information to be transmitted and cascade Bit Interleave obtains institute
State total interleaving bits.With reference to shown in Fig. 4, it is specially：Outer channel coding is carried out to information to be transmitted and outer Bit Interleave obtains outer
Interleaving bits, external interleaving bits carry out interior channel coding and Nepit intertexture obtains total interleaving bits.Cascaded channel encode and
Cascade Bit Interleave can be equivalent to total channel coding and total Bit Interleave.Preferably, outer Bit Interleave length is encoded with outer channel
Code word size it is identical.
The code word size for the interior channel coding that outer interleaving bits are obtained after interior channel coding is dramatically increased, and can internally be believed
Road coded-bit carries out obtaining packet bit after bit groupings first, and to packet bit carry out group Nepit intertexture, obtains total
Interleaving bits.Wherein, interior channel coding and bit groupings can exchanging orders as needed, you can advanced with external interleaving bits
Row bit groupings, then carry out interior channel coding.
Preferably, group Nepit weaving length is less than outer Bit Interleave length, for example, group Nepit weaving length is limited to
Transmitted bit number of one user in one or more resource particles, to facilitate the MPA of multiple resource particles of receiving terminal to change
Generation detection.
Preferably, interior channel coding is irregular repeated encoding, wherein, irregular repeated encoding is different information bits
Number of repetition is different.Limited group Nepit weaving length and irregular repeated encoding ensure that the low multiple of receiving terminal MPA algorithms
Miscellaneous degree and external information transmission capacity.
With reference to shown in Fig. 5, irregular duplication code carries out repeated encoding to k information bit, obtains m check bit, code
Rate is k/ (m+k), can be represented with check matrix, m=4, k=3 in such as figure.The row of check matrix represent variable node, variable
Node is made up of k information bit variable node and m check bit variable node, and the row of check matrix represents check-node,
That is check equations.The essential characteristic of the check matrix of irregular duplication code is that row is fixed as 2 again, represents bit replicated relation, one
Individual check bit and be only an information bit repetition.The corresponding row of information bit are bit number of repetition, such as information again
Bit k3Respective column weight is 2, then number of repetition is information bit two check bits of correspondence of 2, i.e., one；It is used as special case, row weight
Represent that the information bit is not involved in repeated encoding for 0.The row weight of the check matrix of irregular duplication code is irregular.To sum up, non-rule
Then duplication code can adjust the number of repetition of different information bits, obtain different equivalent code checks, and can pass through optimization pair
The check matrix answered, improves the external information transmission characteristic of MPA algorithms or improves the overall performance of iterative joint decoding.
The scheme of this combination group Nepit intertexture, irregular repeated encoding and traditional single user channel coding, in
For low frequency spectrum efficiency scene, the Multiuser Detection that the Multiuser Detection in a resource particle is expanded in multiple resources.
The simple advantage of tradition MPA algorithm iterations is kept, meanwhile, the Multiuser Detection in multiple resource particles can be handed over by group Nepit
Transmission external information is knitted, the Multiuser Detection result based on MPA algorithms is significantly improved, it is to avoid iterative joint solution code system or non-iterative
MPA solves the capacitance loss of code system.
In certain embodiments, the different transmitting terminal of different group Nepit intertexture correspondences.That is, different user is selected
Different Bit Interleaves are selected, in order to which base station receiving terminal distinguishes different user.Preferably, different user selection identical outer channel is compiled
Code, outer Bit Interleave, irregular duplication code and bit groupings, but the different group Nepit of selection interweaves.
S2：Total interleaving bits carry out constellation mapping and obtain constellation mapping symbol.
S3：Constellation mapping symbol is mapped to by resource particle according to signature pattern, wherein, signature pattern is adjustable for density
And do not have repeated characteristic between corresponding symbol of signing, distinguish the mode or Bit Interleave of different transmitting terminals not
Together, either signature pattern is different or Bit Interleave is different with signature pattern.
The transmission conditions that the density of signature pattern can be accessed according to uplink multi-address are adjusted.
With reference to shown in Fig. 6, the signature distribution of 3 different densities provided, a resource includes 4 code elements, for user
Load factor 150%, 100% and 75% 3 kind of situation, by selecting the signature that density is respectively 50%, 75% and 100%, make
Obtain single code element superposition number of users and remain 3, both obtained the power gain and diversity gain of multi-user's superposition, single code is maintained again
The complexity of first Multiuser Detection.
If the signature of 3 users is identical, base station receiving terminal can not effectively distinguish user.Further, different user is selected
Different Bit Interleaves and signature pattern combination are selected, in order to which base station receiving terminal distinguishes different user.For example, base station can be distinguished
Two users that pattern of signing is identical but Bit Interleave is different or Bit Interleave is identical but signature pattern is different.With reference to interlacing multi-address
(Interleave Division Multiple Access, IDMA) technology distinguishes the thought of user, the present invention with intertexture pattern
Differentiation user is combined using Bit Interleave and signature pattern, user load rate can be effectively improved.
Process is produced relative to above-mentioned transmission end signal, decodes non-to carry out uplink multi-users corresponding to receiving end signal
Orthogonal multiple access access, i.e.,：With reference to shown in Fig. 7 and Fig. 8, receiving end signal decoding process includes：
S11：The docking collection of letters number carries out mode detection and a channel estimation, obtains multi-user transmission information, wherein, it is described to receive
Signal includes resource particle；Wherein, multi-user transmission information includes but is not limited to：Channel coding, Bit Interleave, constellation mapping,
Resource particle signature pattern and channel condition information etc..
S12：According to multi-user transmission information, with reference to the prior information of interleaving bits outside multi-user, to multiple resource particles
MPA algorithm iterations are carried out, the external information of the outer interleaving bits of multiple resource particles is obtained, through outer than deinterleave, obtains multiple
The prior information of the outer coding bit of user, wherein, the outer interleaving bits prior information initialization of multi-user of channel decoding feedback
It is zero；
S13：Prior information to the outer coding bit of multi-user carries out outer channel decoding, obtains the outer coding ratio of multi-user
Special external information；
S14：Detect whether to reach maximum iteration or demodulating and decoding success, if it is, output information bit is estimated
Value, if it is not, then according to outer Bit Interleave, the ratio that interweaves outside multi-user is obtained using the external information of the outer coding bit of multi-user
Special prior information, re-starts MPA algorithm iterations.
As the receiving terminal decoding process of another embodiment, with reference to shown in Fig. 9 and Figure 10, including：
S21：The docking collection of letters number carries out mode detection and a channel estimation, obtains multi-user transmission information, and receiving signal includes
Resource particle；
S22：According to multi-user transmission information, with reference to the interleaved multi-user bit prior information of channel decoding feedback, to money
Source particle obtained by code element Multiuser Detection the external information of interleaved multi-user bit, through always than being used after deinterleave
The prior information of family coded-bit, wherein, the interleaved multi-user bit prior information of channel decoding feedback is initialized as zero；
S23：Prior information to each subscriber-coded bit carries out channel decoding, obtains the outer of each subscriber-coded bit
Information；
S24：Detect whether to reach maximum iteration or demodulating and decoding success, if it is, output information bit is estimated
Value, if it is not, then according to total Bit Interleave, the elder generation of interleaved multi-user bit is obtained using the external information of multi-user coding bit
Information is tested, is re-started by code element Multiuser Detection.
According to the uplink multi-users non-orthogonal multiple cut-in method of the present invention, the multiple of traditional LDS-MA technologies are overcome to lack
Fall into.On the one hand, with reference to different Bit Interleaves, user is distinguished by using the adjustable signature of density, low user load is improved
Cross correlation under the conditions of rate between different user signature, it is ensured that the nonopiate Superposition Characteristics of multi-user's multi-upstream access, in senior middle school
The superposition number of users of single code element can be maintained under the conditions of low different user load factor, receiving terminal is maintained by code element Multiuser Detection
Complexity；On the other hand, cancel and do not have repeated characteristic between the spread spectrum feature of signature, that is, corresponding symbol of signing,
It therefore, it can design the higher multi-user coding modulating system of code check, significantly reduce single code element multi-user inspection under high spectrum efficiency
The complexity of survey；For example, to spectral efficient scene, channel coding can be redesigned, to ensure the anon-normal of iterative joint decoding
Multiple access performance is handed over, promotes the external information between the channel decoding by code element Multiuser Detection and each user to transmit.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include at least one this feature.In the description of the invention, " multiple " are meant that at least two, such as two, three
It is individual etc., unless otherwise specifically defined.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally；Can be that machinery connects
Connect or electrically connect；Can be joined directly together, can also be indirectly connected to by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements, unless otherwise clear and definite restriction.For one of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or the spy that the embodiment or example are described
Point is contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.Moreover, specific features, structure, material or the feature of description can be with office
Combined in an appropriate manner in one or more embodiments or example.In addition, in the case of not conflicting, the skill of this area
Art personnel can be tied the not be the same as Example or the feature of example and non-be the same as Example or example described in this specification
Close and combine.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changed, replacing and modification.
Claims (8)
1. a kind of uplink multi-users non-orthogonal multiple cut-in method, it is characterised in that the uplink multi-users non-orthogonal multiple connects
Entering method includes sending end signal generation process and receiving end signal decoding process, and the transmission end signal, which produces process, to be included：
Channel coding is carried out to information to be transmitted and Bit Interleave obtains total interleaving bits；
Constellation mapping is carried out to total interleaving bits and obtains constellation mapping symbol；
The constellation mapping symbol is mapped to by resource particle according to signature pattern, wherein, the signature pattern is that density is adjustable
Do not have repeated characteristic between whole and corresponding symbol of signing, distinguish the mode or Bit Interleave of different transmitting terminals not
Together, either signature pattern is different or Bit Interleave is different with signature pattern.
2. uplink multi-users non-orthogonal multiple cut-in method according to claim 1, it is characterised in that including：
Cascaded channel coding is carried out to information to be transmitted and cascade Bit Interleave obtains total interleaving bits.
3. uplink multi-users non-orthogonal multiple cut-in method according to claim 1 or 2, it is characterised in that be specially：It is right
The information to be transmitted carries out outer channel coding and outer Bit Interleave obtains outer interleaving bits, the outer interleaving bits is carried out interior
Channel coding, bit groupings and group Nepit, which interweave, obtains total interleaving bits.
4. uplink multi-users non-orthogonal multiple cut-in method according to claim 3, it is characterised in that the interior channel is compiled
Code is irregular repeated encoding, wherein, the irregular repeated encoding is different for the number of repetition of different information bits.
5. uplink multi-users non-orthogonal multiple cut-in method according to claim 3, it is characterised in that described group of Nepit
Weaving length is less than outer Bit Interleave length.
6. uplink multi-users non-orthogonal multiple cut-in method according to claim 3, it is characterised in that different described group
The different transmitting terminal of Nepit intertexture correspondence.
7. the uplink multi-users non-orthogonal multiple cut-in method according to claim any one of 1-6, it is characterised in that described
Receiving end signal decoding process includes：
The docking collection of letters number carries out mode detection and a channel estimation, obtains multi-user transmission information, wherein, the reception signal includes
Resource particle；
According to multi-user transmission information, with reference to the prior information of interleaving bits outside multi-user, MPA calculations are carried out to multiple resource particles
Method iteration, obtains the external information of the outer interleaving bits of multiple resource particles, through outer than deinterleave, obtains the outer volume of multiple users
The prior information of code bit, wherein, the outer interleaving bits prior information of multi-user of channel decoding feedback is initialized as zero；
Prior information to the outer coding bit of multi-user carries out outer channel decoding, obtains the outer letter of the outer coding bit of multi-user
Breath；
Detect whether to reach maximum iteration or demodulating and decoding success, if it is, output information estimated value, if not
It is, then according to outer Bit Interleave, the priori of interleaving bits outside multi-user to be obtained using the external information of the outer coding bit of multi-user
Information, re-starts MPA algorithm iterations.
8. the uplink multi-users non-orthogonal multiple cut-in method according to claim any one of 1-6, it is characterised in that described
Receiving end signal decoding process includes：
The docking collection of letters number carries out mode detection and a channel estimation, obtains multi-user transmission information, and the reception signal includes resource
Particle；
According to multi-user transmission information, with reference to the interleaved multi-user bit prior information of channel decoding feedback, resource particle is entered
Row obtains the external information of interleaved multi-user bit by code element Multiuser Detection, through always than obtaining multi-user coding ratio after deinterleave
Special prior information, wherein, the interleaved multi-user bit prior information of channel decoding feedback is initialized as zero；
Prior information to each subscriber-coded bit carries out channel decoding, obtains the external information of each subscriber-coded bit；
Detect whether to reach maximum iteration or demodulating and decoding success, if it is, output information estimated value, if not
It is, then according to total Bit Interleave, the prior information of interleaved multi-user bit to be obtained using the external information of multi-user coding bit, weight
Newly carry out by code element Multiuser Detection.
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