CN108989252A - A kind of multiple access method and system - Google Patents
A kind of multiple access method and system Download PDFInfo
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- CN108989252A CN108989252A CN201810804532.9A CN201810804532A CN108989252A CN 108989252 A CN108989252 A CN 108989252A CN 201810804532 A CN201810804532 A CN 201810804532A CN 108989252 A CN108989252 A CN 108989252A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/001—Modulated-carrier systems using chaotic signals
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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
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2691—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation involving interference determination or cancellation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/001—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols using chaotic signals
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Abstract
The embodiment of the invention provides multiple access method and system, method includes: using default chaos sequence as the scrambler sequence of each user, and chaos sequence is generated by preset recursion equation；Based on the scrambler sequence of each user, the data information of each user is scrambled；User data information after scrambling is sent to receiving end, so that superposed signal of the receiving end to all users carries out Multiuser Detection and interference elimination, to complete multiple access access.Multiple access method provided in an embodiment of the present invention and system, by using chaos sequence as the scrambler sequence of each user, due to chaos sequence have it is aperiodic, do not restrain, to initial value extremely sensitivity, class broadband white color noise, sharp auto-correlation and lower cross correlation, so further lifting system reliability and validity while the safety of system can be improved.
Description
Technical field
The present embodiments relate to mobile communication technology field more particularly to a kind of multiple access method and systems.
Background technique
Multiple access technology is considered as the mark of each Generation Mobile Communication System.In the first Generation Mobile Communication System to forth generation
Frequency division multiple access (Frequency Division Multiple Access, FDMA), time-division are respectively adopted in mobile communication system
Multiple access (Time Division Multiple Access, TDMA), CDMA (Code Division Multiple
Access, CDMA) and orthogonal frequency division multiple access (Orthogonal Frequency Division Multiple Access,
OFDMA) technology.These multiple access technologies are all to go to distinguish different users using orthogonal frequency domain, time domain or code domain resource.With
The fast development of Internet of Things will face more user terminals and higher towards 2020 and following 5G mobile communications network
The challenge such as data rate.The big application scenarios of the three of 5G communication network are enhancing mobile broadband (enhanced Mobile respectively
BroadBand, eMBB), magnanimity machine type communication (massive Machine Type Communications, mMTC) and super
Reliably with low time delay (Ultra-Reliable and Low Latency Communications, URLLC), each scene
There is its unique and demand.However, utilizing current orthogonal multiple access (Orthogonal Multiple Access, OMA)
It is difficult to meet these demands, new non-orthogonal multiple (Non-Orthogonal multiple access, NOMA) is considered as
One crucial technology can satisfy these demands.In transmitting terminal, the multi-user information of NOMA system is in identical running time-frequency resource
Upper superposition is sent, and in receiving end, it can be with efficient coding multi-user information using the multiuser detection algorithm of robust.Theoretically,
It, can using the NOMA system of the Multiuser Detection based on counteracting serial interference no matter for uplink multi-address or downlink multi-access
Approach the channel capacity of multi-user.
But the transmission of existing wireless communication takes into consideration only the reliability and validity of system, and have ignored the peace of system
Quan Xing, therefore need a kind of method of novel multiple access access now to solve the above problems.
Summary of the invention
To solve the above-mentioned problems, the embodiment of the present invention provides one kind and overcomes the above problem or at least be partially solved
State a kind of multiple access method and system of problem.
The first aspect embodiment of the present invention provides a kind of multiple access method, comprising:
Using default chaos sequence as the scrambler sequence of each user, wherein the chaos sequence passes through preset recurrence
Equation generates；
Based on the scrambler sequence of each user, the data information of each user is scrambled；
User data information after scrambling is sent to receiving end, so that the receiving end is to the superposed signal of all users
It carries out Multiuser Detection and interference is eliminated, to complete multiple access access.
The embodiment of the invention also provides a kind of multiple access methods for second aspect, comprising:
Receive the signal of each user of transmitting terminal transmission；
Multiuser Detection is carried out to the superposed signal of all users and interference is eliminated, to complete multiple access access.
The embodiment of the invention also provides a kind of transmitting terminals for the third aspect, comprising:
Chaos sequence generation module, for using default chaos sequence as the scrambler sequence of each user, wherein described mixed
Ignorant sequence is generated by preset recursion equation；
Scrambling module scrambles the data information of each user for the scrambler sequence based on each user；
Sending module, for the user data information after scrambling to be sent to receiving end, so that the receiving end is to all
The superposed signal of user carries out Multiuser Detection and interference is eliminated, to complete multiple access access.
The embodiment of the invention provides a kind of receiving ends for fourth aspect, comprising:
Receiving module, the signal of each user for receiving transmitting terminal transmission；
Multiple access AM access module carries out Multiuser Detection for the superposed signal to all users and interference is eliminated, to complete
Multiple access access.
The embodiment of the invention provides a kind of multiple access systems for 5th aspect, comprising:
Transmitting terminal as described above and receiving end as described above, the multiple access system are believed for up-link wireless
Road transmission or downlink broadcast channel transmission.
Multiple access method provided in an embodiment of the present invention and system pass through disturbing using chaos sequence as each user
Code sequence, due to chaos sequence have it is aperiodic, do not restrain, to initial value extremely sensitivity, class broadband white color noise, sharply from phase
Pass and lower cross correlation, so the safety of system can be improved while further lifting system reliability.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Bright some embodiments for those of ordinary skill in the art without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is a kind of multiple access method flow diagram provided in an embodiment of the present invention；
Fig. 2 is the autocorrelation performance of chaos sequence provided in an embodiment of the present invention；
Fig. 3 is the cross correlation of chaos sequence provided in an embodiment of the present invention；
Fig. 4 is another multiple access method flow diagram provided in an embodiment of the present invention；
Fig. 5 is simulation result schematic diagram under 6 user situations；
Fig. 6 is simulation result schematic diagram under 8 user situations；
Fig. 7 is a kind of sending end structure figure provided in an embodiment of the present invention；
Fig. 8 is the structural block diagram of transmitter provided in an embodiment of the present invention；
Fig. 9 is a kind of receiving end structure chart provided in an embodiment of the present invention；
Figure 10 is the structural block diagram of receiver provided in an embodiment of the present invention；
Figure 11 is the multiple access system structural schematic diagram provided in an embodiment of the present invention suitable for uplink wireless channel.
Figure 12 is a kind of multiple access system structural representation provided in an embodiment of the present invention suitable for downlink broadcast channel
Figure.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical solution in the embodiment of the present invention is explicitly described, it is clear that described embodiment is the present invention
A part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not having
Every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.
Currently, the scheme of these technologies essentially consists in hair in the prior art there are many non-orthogonal multiple technology is planted
The design of sending end is different, but these schemes all have unified frame, and transmitting terminal is broadly divided into two parts operation: first part
The predominantly operation of bit-level, mainly include channel coding is carried out to user data and selective carry out bit-level intertexture or
Scrambling.Second part is mainly the operation of symbol level, and main includes that generation modulation symbol sequence and modulation symbol are mapped to resource
Block (Resource Element, RE), wherein modulation symbol sequence is mainly obtained by advanced modulation system, Yong Hute
Fixed symbol level spread spectrum, the specific symbol level scrambling of user, the specific symbol level intertexture of user or the specific sparse graph of user
Sample matrix (signature matrix).It is different according to the processing of transmitting terminal, these NOMA schemes are classified, respectively scrambling code class
NOMA, spread spectrum class NOMA, coding class NOMA and interweaving type NOMA.
Wherein, leading NOMA scheme to be applied in the prior art has sparse CDMA (Sparse Code Multiple
Access, SCMA), multiple users share access (Multi-User Shared Access, MUSA) two schemes.Sparse Code point is more
Location (Sparse Code Multiple Access, SCMA) is a kind of coding class non-orthogonal multiple technology based on sparse code book.
Its core concept is to realize by code domain extension and nonopiate superposition and accommodate more users under same number of resources, so that in user
Experience it is unaffected under the premise of, increase network overall throughput.Multiple users share accesses (Multi-User Shared
Access, MUSA) technology is a kind of typical symbol level spread spectrum class NOMA scheme, the key component of the program is that transmitting terminal is adopted
With the short frequency expansion sequence of the symbol level of low correlation.The generation of MUSA frequency expansion sequence real part, imaginary part at present be all made of ternary set-
1,0,1 }, the short frequency expansion sequence of complex value is generated by the way of random configuration, and there is relatively low cross correlation.
But considered only the reliability and validity of system in the scheme that provides of the prior art, do not account for be
The safety of system.Traditional pseudo-random sequence uses m-sequence and Gold sequence.M-sequence be it is most important, most basic it is a kind of it is pseudo- with
Machine sequence, it be generated by the shift register that is fed back with line style, regularity is strong, have good autocorrelation and it is preferable mutually
Correlation properties.But when the number of users in multi-address system is more, the number of m-sequence is just not enough used.It is therefore proposed that passing through m
Sequence preferably constitutes Gold sequence to displacement, and the sequence number for generating it is not so good as m more than m-sequence, the autocorrelation of Gold code
Sequence has three value autocorrelation performances.Theoretical analysis shows that although the number of Gold sequence is more than the number of m-sequence, still not
Random access while can satisfy a large number of users.Meanwhile the sequence period that n grades of shift registers generate is 2n- 1, need to only it know
Complete sequence can be obtained in n original state of road shift register, therefore the safety of the sequence is poor.However, opposite
Traditional Gold sequence and m-sequence, chaos sequence have more excellent characteristic, as wide spectrum, aperiodic, similar noise, compared with
Low auto-correlation, cross-correlation and initial value sensitivity.In view of the above-mentioned problems, Fig. 1 is that a kind of multiple access provided in an embodiment of the present invention connects
Enter method flow schematic diagram, as shown in Figure 1, comprising:
101, using default chaos sequence as the scrambler sequence of each user, wherein the chaos sequence passes through preset
Recursion equation generates；
102, the scrambler sequence based on each user, scrambles the data information of each user；
103, the user data information after scrambling is sent to receiving end, the superposition for the receiving end to all users
Signal carries out Multiuser Detection and interference is eliminated, to complete multiple access access.
It should be noted that the executing subject of the embodiment of the present invention is transmitting terminal, it is also possible to arbitrarily can be realized transmission
Hold the entity or virtual unit of function, such as transmitter.It is understood that transmitting terminal provided in an embodiment of the present invention is mainly answered
For NOMA system, cooperate the receiving end in NOMA system, completes multiple access access.
In a step 101, it is to be understood that be different from the prior art, the embodiment of the invention provides a kind of chaos is non-
Orthogonal multiple access schemes scramble chaos sequence applied to non-orthogonal multiple, will be above-mentioned mixed in all embodiments of the invention
Ignorant non-orthogonal multiple access scheme is alternatively referred to as CSMA (Chaotic Scrambling Multiple Access) scheme.This hair
The chaos sequence that bright embodiment provides is generated by preset recursion equation, it is to be understood that chaos sequence has width
Frequency spectrum, aperiodic, similar noise, good correlation and initial value sensitivity.These good characteristics can make the data sent
Information is disorderly and unsystematic as noise, improves the ability of anti-interception of system, increases the safety of system.
It is understood that scrambler sequence is to facilitate the extraction always of receiving end, together to reduce intersymbol interference and shake
When can also play the effect of encryption, so can significantly improve the safety of system using chaos sequence as scrambler sequence
Energy.
In a step 102, it is to be understood that be substantially carried out symbol level operation in transmitting terminal, i.e. final purpose needs
QAM (QuadratureAmplitude Modulation) modulation is carried out again after generating the data symbol of user.Specifically, utilizing
The scrambler sequence that the embodiment of the present invention generates in a step 101 carries out chaos scrambling to the data information of each user, thus
To the data symbol of each user, may be expressed as: with formulaWherein,Indicate point
Multiply, i.e. miWith siIt is multiplied according to the corresponding position of each element, L/log2(M) be scrambler sequence length, miIt is i-th of user
Modulated symbol, siIt is the chaos scrambler sequence of i-th of user.
Further, in step 103, it is to be understood that transmitting terminal needs just be sent to after signal modulation
Receiving end, so that receiving end carries out the operations such as demodulation descrambling and completes multiple access access.CSMA scheme energy provided in an embodiment of the present invention
Enough and existing OFDM technology perfection is compatible, so preferably, in embodiments of the present invention, use OFDM technology to signal into
Row modulation, is finally transmitted to receiving end for modulated signal, it is to be understood that transmission provided in an embodiment of the present invention respectively
Process, which can be applied to uplink multi-address, can also be applied to downlink multi-access, and the present invention is not especially limit this.
Multiple access method provided in an embodiment of the present invention and system pass through disturbing using chaos sequence as each user
Code sequence, due to chaos sequence have it is aperiodic, do not restrain, to initial value extremely sensitivity, class broadband white color noise, sharply from phase
Pass and lower cross correlation, so the safety of system can be improved while further lifting system reliability.
On the basis of the above embodiments, the user data information by after scrambling is sent to receiving end, comprising:
Data symbol based on each user and ODFM modulation, respectively by the signal of each user by independent uplink without
Line channel is sent to receiving end, or
OFDM modulation will be carried out after data symbol superposition after each user scrambling, and passes through independent downlink broadcast channel
It is sent to each receiving end.
By the content of above-described embodiment it is found that the embodiment of the present invention can be applied in up-link and downlink system.
It applies in up-link, transmitting terminal specifically needs data symbol and the ODFM modulation to each user, then will
Treated subscriber signal is sent to receiving end by independent uplink wireless channel.Similar, it is provided in an embodiment of the present invention
Scheme can be applied in downlink system, specifically, applying in downlink system, transmitting terminal is believed in the data to each user
After breath is scrambled, the data symbol after scrambling each user is superimposed, and then carries out OFDM to superimposed data symbol
Modulation is finally sent to each reception user by independent downlink broadcast channel.
On the basis of the above embodiments, the recursion equation are as follows:
Wherein, α is Logistic parameter, value range be (0,2], the value range of x is between [- 1,1]；Correspondingly,
It is described using default chaos sequence as the scrambler sequence of each user before, the method also includes:
Based on preset coding mode, the data information of each user is encoded.
It should be noted that there are following several forms for main chaotic maps: Logistic mapping, modified
Logistic mapping, Cubic mapping and Tent mapping etc..These types of chaotic maps belong to discrete time chaos system, this hair
Bright embodiment is illustrated so that Logistic maps as an example, typical Logistic mapping equation is defined as:
xk+1=f (xk)=λ xk(1-xk),
Wherein, λ is Logistic parameter, its value range is [0,4], and the value range of x is [0,1], this mapping
Equation is transformed by insect.As 0≤λ≤1, mapping tends to fixed equalization point 0, as 1≤λ≤3, mapping
It tends to balance point (λ -1)/2；WhenWhen, it is no longer stable but also do not tend to chaos；When λ continues to increase,
When in (3.5699456,4) range, there are infinite period, at this point for almost all of initial value, bounded and non-can be generated
The chaos sequence in period, and when λ is closer to 4, chaotic characteristic is more obvious.
On the basis of above-mentioned typical case's Logistic mapping equation, the embodiment of the present invention is made improvements, and obtains this hair
The recursion equation of bright embodiment:
Wherein, α is Logistic parameter, value range be (0,2], the value range of x between [- 1,1], mapping with
The variation of α, final state are also variation.Correlation properties and spectral characteristic of the recursion equation etc. will be substantially better than allusion quotation
The Logistic of type maps.
And, it is preferred that as α=2, equation can be mapped on entire [- 1,1] section, this is claimed to be mapped as full mapping, this
When randomness highest, then equation when α=2 will be used as the most preferred chaos sequence of the embodiment of the present invention.
Fig. 2 is the autocorrelation performance of chaos sequence provided in an embodiment of the present invention, and Fig. 3 is provided in an embodiment of the present invention mixed
The cross correlation of ignorant sequence, as shown in Figures 2 and 3, chaos sequence provided in an embodiment of the present invention are extremely sensitive to initial value, and
And have good correlation properties, these excellent characteristics determine chaos sequence can be improved NOMA system safety and
Reliability.
It is described to be based on preset coding mode, the data information of each user is encoded, is specifically included:
Based on the forward error correction of default code rate, the data information of each user is encoded, each use is obtained
Bit after the coding of family.
By the content of above-described embodiment it is found that the embodiment of the invention provides a kind of CSMA system, by utilizing chaos sequence
Column are used as scrambler sequence, improve the security performance of system.On this basis, it is to be understood that carried out to user data
Before scrambling, it is also necessary to be encoded accordingly to it.The embodiment of the present invention preferably provides a kind of forward error correction
The mode of (Forward Error Correction, FEC) is encoded, typical coding mode such as loe-density parity-check code
(Low Density Parity Check,LDPC)。
Specifically, on identical running time-frequency resource, the CSMA scheme of uplink maps the data of K user to a resource grains
On son, therefore, the Overflow RateHT of user is K.The information bit of i-th of userThe FEC for being R by a code rate
Encoder is encoded, and wherein J is the length of information bit.
On the basis of the above embodiments, the scrambler sequence based on each user, to the data of each user
Information is scrambled, and is specifically included:
By it is described it is each it is subscriber-coded after bit map be each user complex symbol information；
Based on the scrambler sequence of each user, is respectively carried out to the complex symbol information of each user corresponding add
It disturbs, to obtain the data symbol of each user.
By the content of above-described embodiment it is found that the embodiment of the present invention is scrambled again after being encoded, and is finally needed
Obtain the data symbol of each user.
Detailed process are as follows: according to the mapping ruler of M grades of quadrature amplitude modulation constellation collection, by the bit after codingIt is mapped to complex symbol informationWherein, the data after L presentation code are long
Degree, M is the size of qam constellation collection, for example, the M=16 for 16QAM.The modulated symbol m of i-th of useriAccording to user spy
Fixed scrambler sequence is scrambled.Assuming that the chaos scrambler sequence of i-th of user isWherein, L/
log2(M) be chaos scrambler sequence length.After scrambling, the data symbol of i-th of userWherein,Indicate dot product, i.e. miWith siIt is multiplied according to the corresponding position of each element.
Fig. 4 is another multiple access method flow diagram provided in an embodiment of the present invention, as shown in Figure 4, comprising:
401, the signal of each user of transmitting terminal transmission is received；
402, Multiuser Detection is carried out to the superposed signal of all users and interference is eliminated, to complete multiple access access.
It should be noted that the executing subject of the embodiment of the present invention is receiving end, it is also possible to arbitrarily can be realized reception
Hold the entity or virtual unit of function, such as receiver.It is understood that transmitting terminal provided in an embodiment of the present invention is mainly answered
For NOMA system, cooperate the transmitting terminal in NOMA system, completes multiple access access.
In step 401, it is to be understood that receiving end receives the subscriber signal that transmitting terminal is sent, in general,
The meeting received is a superposed signal, is formulated are as follows:
Wherein, hkFor the channel response of k-th of user；N is zero-mean, variance σ2Additive white Gaussian noise
(Additive Gaussian White Noise,AWGN)。
In step 402, for user's superposed signal in step 401, it is to be understood that receiving end needs to detect should
Signal, and the transmission signal of each user is isolated, each signal could be respectively processed, to complete multiple access access.And
The major way for realizing the process is that Multiuser Detection and interference are eliminated, and can complete multiple access access by above-mentioned technology, know
It Chu not each corresponding transmission signal of user.
Multiple access method provided in an embodiment of the present invention, by using chaos sequence as the scrambling code sequence of each user
Column, due to chaos sequence have it is aperiodic, do not restrain, to initial value extremely sensitivity, class broadband white color noise, sharp auto-correlation with
And lower cross correlation, so the safety of system can be improved while further lifting system reliability.
On the basis of the above embodiments, the superposed signal of described couple of all users carries out Multiuser Detection and interference disappears
It removes, to complete multiple access access, specifically includes:
Based on LMSE method, Multiuser Detection is carried out to the superposed signal of all users, it is every to isolate
The transmission signal of a user；
Based on interference cancellation algorithm or parallel interference canceller algorithm, interference is carried out to the transmission signal of each user and is disappeared
It removes, to complete multiple access access.
Since least mean-square error (Minimum Mean Square Error, MMSE) is linear receiver and is letter
Cease it is lossless, so the embodiment of the present invention preferably also utilize low complex degree MMSE receiver carry out Multiuser Detection.With
, simultaneously the embodiment of the invention also provides two kinds of interference cancellations, first way is to be eliminated using interference for this
(Interference Cancellation, IC) algorithm can be approached since IC algorithm realizes the chain rule of mutual information
The total rate of user uplink link.Therefore the multiuser detection algorithm based on MMSE-IC is used to separate the superposition letter of multiple users
Breath.By the chain rule of mutual information it is found that the information of previous user is completely known when calculating next user
's.So guaranteeing that the reliability of previous user information can be realized as far as possible when using IC technology for eliminating.Second of side
Formula is parallel interference canceller (Parallel Interference Cancellation, PIC) algorithm, it is to be understood that by
The transmission signal of each user can be detected simultaneously in MMSE detection, so PIC algorithm can be directly used, for decoding just
True multiple users do interference together and eliminate, the processing time eliminated so as to shorten interference.
Further, it is different from the prior art, the schemes such as traditional SCMA and MUSA, spreading factor is greater than 1, generally
Emulation assume in the spreading factor representative value that uses for 4, by specifically signing, (spread spectrum) matrix distinguishes different users.And this
The spreading factor for the CSMA that inventive embodiments provide can be considered as 1, mainly go to area by the specific chaos scrambling code of each user
Divide different users, simultaneously because the spreading factor of CSMA is smaller, therefore, under identical spectrum efficiency, CSMA scheme is corresponding
Code rate it is lower, coding gain can be made full use of.
In order to verify the performance of multiple access method provided in an embodiment of the present invention and system, the embodiment of the present invention is carried out
Link level simulation.
Basic simulated conditions are the fading channel using tapped delay line (Tapped Delay Line, TDL) C model,
Wherein delay spread is 1000ns, and abbreviation TDL-C-1000 channel, coding mode is using the LDPC in 5G agreement, using 1T2R's
Antenna configuration, carrier frequency 2GHz, subcarrier spacing 15KHz, system bandwidth 10MHz, FFT length is 1024, nonopiate more
The modulation system of location is QPSK modulation.The prior art of comparison is respectively SCMA scheme and MUSA scheme.Wherein, SCMA scheme
4 code books provided using Huawei, receiver use Message Passing Algorithm (Message Passing Algorithm, MPA),
The number of iterations is set as 6 times, and the real part of each element of MUSA frequency expansion sequence, imaginary part all random values are in simple three metaset
It closes { -1,0,1 }, receiver uses MMSE-SIC algorithm, and SCMA and MUSA spreading length are 4.The information bit length of all schemes
Degree is 216 bits, occupies 6 Physical Resource Block.
In order to guarantee identical spectrum efficiency, for 6 user's NOMA and OMA schemes, CSMA uses code rate for 0.125
The encoder bit rate that LDPC, SCMA and MUSA are used is modulated for 0.5, OMA using QPSK, code rate 0.75, for 8 user NOMA and
OMA scheme, the modulation that the encoder bit rate that CSMA uses code rate to use for 0.125 LDPC, SCMA and MUSA uses for 0.5, OMA
Mode is 16QAM modulation, encoder bit rate 0.5.
Fig. 5 is simulation result schematic diagram under 6 user situations, and Fig. 6 is simulation result schematic diagram under 8 user situations, such as Fig. 5 and
Shown in Fig. 6, under 6 user situations, when Block Error Rate (Block Error Rate, BLER) is 0.1, CSMA is about better than SCMA
1.4dB is better than MUSA about 1.66dB, is better than OMA about 3.28dB.From figure 3, it can be seen that under 8 user situations, BLER=0.1
When, CSMA is better than SCMA about 1.26dB, is better than MUSA about 1.63dB, is better than OMA about 3.09dB.Simulation result is it can be shown that originally
The multiple access method and system that inventive embodiments provide can be further improved system while enhancing system security
Reliability.
Fig. 7 is a kind of sending end structure figure provided in an embodiment of the present invention, as shown in fig. 7, the transmitting terminal includes: chaos
Sequence generating module 701, scrambling module 702 and sending module 703, in which:
Chaos sequence generation module 701 is used for using default chaos sequence as the scrambler sequence of each user, wherein described
Chaos sequence is generated by preset recursion equation；
Scrambling module 702 is used for the scrambler sequence based on each user, adds to the data information of each user
It disturbs；
Sending module 703 is used to the user data information after scrambling being sent to receiving end, so that the receiving end is to institute
There is the superposed signal of user to carry out Multiuser Detection and interference elimination, to complete multiple access access.
It is specific how to pass through chaos sequence generation module 701, scrambling module 702 and the realization multiple access of sending module 703
Access can be used for executing the technical solution of multiple access method embodiment shown in FIG. 1, and it is similar that the realization principle and technical effect are similar,
Details are not described herein again.
The embodiment of the present invention provides a kind of transmitter, comprising: at least one processor；And connect with the processor communication
At least one processor connect, in which:
Fig. 8 is the structural block diagram of transmitter provided in an embodiment of the present invention, referring to Fig. 8, the transmitter, comprising: processing
Device (processor) 810, communication interface (Communications Interface) 820, memory (memory) 830 and total
Line 840, wherein processor 810, communication interface 820, memory 830 complete mutual communication by bus 840.Processor
810 can call the logical order in memory 830, to execute following method: by default chaos sequence as each user's
Scrambler sequence, wherein the chaos sequence is generated by preset recursion equation；Scrambling code sequence based on each user
Column, scramble the data information of each user；User data information after scrambling is sent to receiving end, is connect for described
Receiving end carries out Multiuser Detection to the superposed signal of all users and interference is eliminated, to complete multiple access access.
The embodiment of the present invention discloses a kind of computer program product, and the computer program product is non-transient including being stored in
Computer program on computer readable storage medium, the computer program include program instruction, when described program instructs quilt
When computer executes, computer is able to carry out method provided by above-mentioned each method embodiment, for example, by default chaos sequence
Arrange the scrambler sequence as each user, wherein the chaos sequence is generated by preset recursion equation；Based on described every
The scrambler sequence of a user scrambles the data information of each user；User data information after scrambling is sent to and is connect
Receiving end is connect so that superposed signal of the receiving end to all users carries out Multiuser Detection and interference elimination with completing multiple access
Enter.
The embodiment of the present invention provides a kind of non-transient computer readable storage medium, the non-transient computer readable storage
Medium storing computer instruction, the computer instruction make the computer execute side provided by above-mentioned each method embodiment
Method, for example, using default chaos sequence as the scrambler sequence of each user, wherein the chaos sequence passes through preset
Recursion equation generates；Based on the scrambler sequence of each user, the data information of each user is scrambled；It will scrambling
User data information afterwards is sent to receiving end, so that superposed signal of the receiving end to all users carries out Multiuser Detection
It is eliminated with interference, to complete multiple access access
Fig. 9 is a kind of receiving end structure chart provided in an embodiment of the present invention, as shown in figure 9, the receiving end includes: to receive
Module 901 and multiple access AM access module 902, in which:
Receiving module 901 is used to receive the signal of each user of transmitting terminal transmission；
Multiple access AM access module 902 is used to carry out Multiuser Detection to the superposed signal of all users and interference is eliminated, with complete
It is accessed at multiple access.
It is specific how to can be used for executing Fig. 4 by receiving module 901 and the realization multiple access access of multiple access AM access module 902
Shown in multiple access method embodiment technical solution, it is similar that the realization principle and technical effect are similar, and details are not described herein again.
The embodiment of the present invention provides a kind of receiver, comprising: at least one processor；And connect with the processor communication
At least one processor connect, in which:
Figure 10 is the structural block diagram of receiver provided in an embodiment of the present invention, referring to Fig.1 0, the transmitter, comprising: place
Manage device (processor) 1010, communication interface (Communications Interface) 1020, memory (memory) 1030
With bus 1040, wherein processor 1010, communication interface 1020, memory 1030 complete mutual lead to by bus 1040
Letter.Processor 1010 can call the logical order in memory 1030, to execute following method: receive transmitting terminal transmission
The signal of each user；Multiuser Detection is carried out to the superposed signal of all users and interference is eliminated, to complete multiple access access.
The embodiment of the present invention discloses a kind of computer program product, and the computer program product is non-transient including being stored in
Computer program on computer readable storage medium, the computer program include program instruction, when described program instructs quilt
When computer executes, computer is able to carry out method provided by above-mentioned each method embodiment, for example, receives transmitting terminal
The signal of each user sent；Multiuser Detection is carried out to the superposed signal of all users and interference is eliminated, to complete multiple access
Access.
The embodiment of the present invention provides a kind of non-transient computer readable storage medium, the non-transient computer readable storage
Medium storing computer instruction, the computer instruction make the computer execute side provided by above-mentioned each method embodiment
Method, for example, receive the signal of each user of transmitting terminal transmission；Multi-user's inspection is carried out to the superposed signal of all users
It surveys and interference is eliminated, to complete multiple access access.
Figure 11 is the multiple access system structural schematic diagram provided in an embodiment of the present invention suitable for uplink wireless channel, such as
Shown in Figure 11, CSMA system described in multiple access system, that is, above-described embodiment provided in an embodiment of the present invention mainly includes
Two parts in receiving end and transmitting terminal, wherein sending end part mainly includes coding, QAM modulation, chaos scrambling, OFDM modulation
And fading channel process, for each with being handled using the process per family, wherein OFDM modulation includes in quick Fu
Leaf inverse transformation (Inverse Fast Fourier Transform, IFFT) and addition cyclic prefix (Cyclic Prefix,
CP).Receiving end mainly includes OFDM demodulation, MMSE-PIC, descrambling, log-likelihood ratio and decoding, to obtain solution to the end
Code signal, and MMSE-PIC process next time is fed back to by decoder, wherein OFDM demodulation includes removal CP and quick Fu
In leaf transformation (Fast Fourier Transform, FFT).
Figure 12 is a kind of multiple access system structural representation provided in an embodiment of the present invention suitable for downlink broadcast channel
Figure, as shown in figure 12, similar with the principle of uplink multi-address access, multiple access system provided in an embodiment of the present invention can also be applied
In downlink broadcast channel, the main distinction applied to downlink broadcast channel and uplink wireless channel is: transmitting terminal is to each use
The information at family is first encoded respectively, QAM modulation, chaos scramble, and then the information of multiple users is overlapped, and is passing through OFDM
It modulates and crosses wireless fading channel, wherein the channel of each user is independent of each other.In receiving end, each user's difference is only
It is vertical to carry out OFDM demodulation, NOMA Multiuser Detection, QAM demodulation and decoding, to obtain the information of each user.
Those of ordinary skill in the art will appreciate that: realize that all or part of the steps of above method embodiment can pass through
The relevant hardware of program instruction is completed, and program above-mentioned can be stored in a computer readable storage medium, the program
When being executed, step including the steps of the foregoing method embodiments is executed；And storage medium above-mentioned includes: ROM, RAM, magnetic disk or light
The various media that can store program code such as disk.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (10)
1. a kind of multiple access method characterized by comprising
Using default chaos sequence as the scrambler sequence of each user, wherein the chaos sequence passes through preset recursion equation
Formula generates；
Based on the scrambler sequence of each user, the data information of each user is scrambled；
User data information after scrambling is sent to receiving end, so that superposed signal of the receiving end to all users carries out
Multiuser Detection and interference are eliminated, to complete multiple access access.
2. the method according to claim 1, wherein the user data information by after scrambling is sent to reception
End, comprising:
Data symbol and ODFM modulation based on each user, respectively believe the signal of each user by independent up-link wireless
Road is sent to receiving end, or
OFDM modulation will be carried out after data symbol superposition after each user scrambling, and is sent by independent downlink broadcast channel
To each receiving end.
3. the method according to claim 1, wherein the recursion equation are as follows:
Wherein, α is Logistic parameter, value range be (0,2], the value range of x is between [- 1,1]；Correspondingly, institute
Before stating using default chaos sequence as the scrambler sequence of each user, the method also includes:
Based on preset coding mode, the data information of each user is encoded.
4. according to the method described in claim 3, it is characterized in that, described be based on preset coding mode, to each use
The data information at family is encoded, and is specifically included:
Based on the forward error correction of default code rate, the data information of each user is encoded, each user is obtained and compiles
Bit after code.
5. according to the method described in claim 4, it is characterized in that, the scrambler sequence based on each user, to every
The data information of a user scrambles, and specifically includes:
By it is described it is each it is subscriber-coded after bit map be each user complex symbol information；
Based on the scrambler sequence of each user, corresponding scrambling is carried out to the complex symbol information of each user respectively, with
Obtain the data symbol of each user.
6. a kind of multiple access method characterized by comprising
Receive the signal of each user of transmitting terminal transmission；Multiuser Detection and interference are carried out to the superposed signal of all users
It eliminates, to complete multiple access access.
7. according to the method described in claim 6, it is characterized in that, the superposed signal of described couple of all users carries out multi-user's inspection
It surveys and interference is eliminated, to complete multiple access access, specifically include:
Based on LMSE method, Multiuser Detection is carried out to the superposed signal of all users, to isolate each use
The transmission signal at family；
Based on interference cancellation algorithm or parallel interference canceller algorithm, interference elimination is carried out to the transmission signal of each user,
To complete multiple access access.
8. a kind of transmitting terminal characterized by comprising
Chaos sequence generation module, for using default chaos sequence as the scrambler sequence of each user, wherein the chaos sequence
Column are generated by preset recursion equation；
Scrambling module scrambles the data information of each user for the scrambler sequence based on each user；
Sending module, for the user data information after scrambling to be sent to receiving end, so that the receiving end is to all users
Superposed signal carry out Multiuser Detection and interference eliminate, with complete multiple access access.
9. a kind of receiving end characterized by comprising
Receiving module, the signal of each user for receiving transmitting terminal transmission；
Multiple access AM access module carries out Multiuser Detection for the superposed signal to all users and interference is eliminated, to complete multiple access
Access.
10. a kind of multiple access system characterized by comprising
Transmitting terminal as claimed in claim 8 and receiving end as claimed in claim 9, the multiple access system are used for uplink
Wireless channel transmission or downlink broadcast channel transmission.
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