CN108134759A - A kind of non-orthogonal multiple cut-in method based on interference cancellation technology - Google Patents
A kind of non-orthogonal multiple cut-in method based on interference cancellation technology Download PDFInfo
- Publication number
- CN108134759A CN108134759A CN201711419394.4A CN201711419394A CN108134759A CN 108134759 A CN108134759 A CN 108134759A CN 201711419394 A CN201711419394 A CN 201711419394A CN 108134759 A CN108134759 A CN 108134759A
- Authority
- CN
- China
- Prior art keywords
- symbol
- user
- ofdma
- signal
- cdma
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
-
- 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
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
- H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
-
- 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
- H04L25/03821—Inter-carrier interference cancellation [ICI]
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a kind of non-orthogonal multiple cut-in method based on interference cancellation technology, the orthogonal collecting systems of OFDMA with N number of user are considered for first group of user, while accommodate M additional user using MC cdma systems as second group.In this is using N+M multi-user's multiple access schemes, first group of N number of user does not interfere between each other, and second group of M user is as the same, but is interfered with each other between two groups of users.The symbol to detect transmission is adjudicated eventually by the iteration of serial interference elimination.The scheme that the present invention implements to provide can both realize channel overload to alleviate frequency spectrum resource deficiency, while it is insufficient creatively to solve the problems, such as that single OFDMA system accommodates number of users.Based on this scheme, NOMA becomes a kind of technology extension of orthogonal multiple access rather than a kind of technology to oppose completely.
Description
Technical field
The present invention relates to field of communication technology, particularly a kind of non-orthogonal multiple access side based on interference cancellation technology
Method.
Background technology
In recent years, non-orthogonal multiple access (NOMA) is nowadays as a research heat of future 5G cellular network physical layers
Point, especially machine type communication (MTC).The rise of this multiple access technology is derived from an existing conclusion of multiuser information theory, i.e.,
It is optimal that orthogonal multiple access technique, which is not usually, and supercomposed coding combination serial interference elimination (SIC) connects for multiple access
Enter to provide an optimal solution.
Historically, time division multiple acess (TDMA) and frequency division multiple access (FDMA) have various forms within considerable time
Application.The two of second generation mobile cellular network big standards are global mobile communication standard (GSM) and IS- in digital cellular network
95 standards.Wherein first is based on TDMA technologies, and second is based on CDMA (CDMA) technology.For 3G network, CDMA skills
Art occupies main status, and wideband CDMA (WCDMA) is as standard.All these networks are all based on single carrier transmission.4G nets
Network is the Multicarrier Transmission Technology based on Orthogonal Frequency Division Multiplexing (OFDM), and OFDM technology is used for digital video broadcast-terrestrial before this
(DVB-T), WiFi and WiMAX.In terms of multiple access access, WiFi is continuing with TDMA, but WiMAX is connect using Orthogonal Frequency Division Multiple Access
Enter (OFDMA), the frequency domain of OFDM is carried out resource allocation by it.And 3GPP long term evolutions (LTE) and LTE-Advanced standards, he
On the uplink using OFDMA, transmit signal using single-carrier frequency division multiple access (SC-FDMA) to reduce in uplink
Papr (PAPR).
These multiple access technologies are all orthogonal, may insure that there is no interference between user in the ideal case.TDMA exists
The same time, only there are one users to be used, and only there are one users in a given frequency to use by traditional FDMA.CDMA's
Orthogonality is ensured by Wo Shier-hada reason signal extension sequence.Although single user's signal weight in frequency in ofdma
It is folded, but since intercarrier is divided into 1/T, wherein T is symbol period, it is orthogonal to realize with this.Certainly, these mentioned technologies
In, perfect synchronization between the orthogonality requirement different user signal of uplink.
Until the birth of multi-user information theory, the orthogonality of different user signal is considered as optimal property always
Matter.But channel capacity is analyzed, it is found that for opening up future network New Century Planned Textbook and recent studies on direction, orthogonal multiple access is not total
It is optimal.Multi-user transmission problem, the frequency spectrum resource deficiency in the case where frequency spectrum resource is in short supply exists in the prior art, it is single
One OFDMA system accommodates the problem of number of users is insufficient.
Invention content
The technical problems to be solved by the invention are overcome the deficiencies in the prior art and provide a kind of based on interference cancellation skill
The non-orthogonal multiple cut-in method of art improves the utilization rate of frequency spectrum.
The present invention uses following technical scheme to solve above-mentioned technical problem：
According to a kind of non-orthogonal multiple cut-in method based on interference cancellation technology proposed by the present invention, including following step
Suddenly：
Step 1: equipped with N+M user, believe the orthogonal collecting systems of the OFDMA with N number of user as first group of OFDMA
Number collection, the output of first group of OFDMA signals collection is N-dimensional qam symbol vector { an, n=1,2,3.......N }, wherein, symbol
anRepresent the OFDMA symbol for distributing to nth user；
Accommodate M user using MC-CDMA signals collection as second group, MC-CDMA signal collection be a m tie up symbol to
Measure { bm, m=1,2,3.......M }, wherein symbol bmThe symbol for distributing to m-th of MC-CDMA user is represented, MC-CDMA is accorded with
On number vector extensions to N number of carrier wave, obtain a N-dimensional vector with OFDMA symbol addition of vectors, that is, emit signal xnFor：Wherein signal extension wm,n=(wm,1,wm,2........wm,N) it is Walsh-Hadamard sequences；
OFDMA signals collection in MC-CDMA signals collection using orthogonal multiple access techniques with being transmitted, between OFDMA signals collection and MC-CDMA signal collection
Using non-orthogonal multiple technical transmission；
Step 2: the symbol to detect OFDMA signals and MC-CDMA signals is adjudicated by the iteration of serial interference elimination；
It is specific as follows：
Received signal is rn, rn=Xn+un, unIt is additional noise, rnFrequency domain is transformed by N points DFT and passes through threshold value
Detector is to OFDMA symbol, that is, anValue of symbol carries out first time iteration judgement, obtains symbol judgement value For anSymbol judgement value；Subtracting the judgement on the basis of DFT operators will exportynPass through one
A Walsh-Hadamard despreaders simultaneously tie up symbolic vector { b with threshold dector to MC-CDMA signal collection mm, m=1,2,
3.......M the judgement of first time iteration } is made；bmCourt verdict is
It is Walsh-Hadamard sequences,It is bmSymbol judgement value, { rn, n=1,2,3.......N } it subtractsResult pass through threshold
It is worth detector to anIt carries out second of value of symbol judgement and obtains second of anSymbol judgement value；Finally, rnSubtract second of an's
Symbol judgement value, the signal obtained are Walsh-Hadamard sequences and continue through threshold dector to bmCarry out second
Sub-symbol value is adjudicated, and obtains second of bmSymbol judgement value.
As a kind of non-orthogonal multiple cut-in method side of advanced optimizing based on interference cancellation technology of the present invention
Case, in step 1, first group of OFDMA signal collection has N number of carrier wave, and sets each carrier wave and distribute to individual user, each
In OFDM symbol a qam symbol is provided to each user.
As a kind of non-orthogonal multiple cut-in method side of advanced optimizing based on interference cancellation technology of the present invention
Case, in step 1, the bandwidth of access channel that the OFDMA signals with N number of user integrate is NW hertz, if OFDMA signals
W represents the bandwidth needed for the signal of transmission single user when the signal of collection individually transmits.
As a kind of non-orthogonal multiple cut-in method side of advanced optimizing based on interference cancellation technology of the present invention
Case, limitation MC-CDMA numbers of users are less than or equal to
As a kind of non-orthogonal multiple cut-in method side of advanced optimizing based on interference cancellation technology of the present invention
Case is extended using Walsh-Hadamard and expands to MC-CDMA symbolic vectors on N number of carrier wave.
The present invention compared with prior art, has following technique effect using above technical scheme：
The present invention can improve the availability of frequency spectrum, realize channel overload to alleviate frequency spectrum resource deficiency, while solve single
OFDMA system accommodates the problem of number of users is insufficient；NOMA become orthogonal multiple access a kind of technology extension rather than it is a kind of completely right
Vertical technology improves the availability of frequency spectrum while number of users is increased.
Description of the drawings
Fig. 1 is the scheme based on TDMA/OCDMA in the prior art.
Fig. 2 is the scheme of combination OFDMA/MC-CDMA that the present invention designs.
Fig. 3 is the block diagram of the NOMA transmitters with reference to OFDMA/MC-CDMA schemes.
Fig. 4 is the block diagram of the NOMA receivers with reference to OFDMA/MC-CDMA schemes.
Fig. 5 is scheme of the invention sketch.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with the accompanying drawings and the specific embodiments
The present invention will be described in detail.
The present invention employs a kind of non-orthogonal multiple access based on interference cancellation technology to improve the utilization rate of frequency spectrum
Scheme.To describe NOMA basic principles, we discuss the up channel of two users in cellular network.We assume that user 1
With stronger signal power P1, user 2 has weaker signal power P2.In these conditions, receiver can detect
For the signal of user 1 by the interference of user 2, the signal that user 1 is subtracted from the signal received can obtain noiseless user 2
Signal.Assuming that channel is the additive white Gaussian noise channel for normalizing bandwidth W=1Hz, 1 capacity R of user1As unit of Hz
Wherein N0It is noise spectral density (noise power during unit bandwidth W=1Hz).Detect the signal that user 1 sends
Later, receiver can subtract the signal to obtain glitch-free 2 signal of user in the signal received.2 capacity R of user2
It is
Therefore, two user's total capacities are
Above formula can be write a Chinese character in simplified form into
P=P1+P2For general power, this shows the capacity of multiuser channel and the single user channel with identical general power
Capacity is identical.
Actual conditions are to be same as the multiple access access (OWMA) of orthogonal waveforms.Without loss of generality, consider that user 2 uses OFDMA
Scheme.Again, P1 represents 1 signal power of user, and P2 represents the power of 2 signal of user, and P=P1+P2 is general power.We provide
P1=α P and P2=(1- α) P, 0≤α≤1.Signal power is evenly distributed on N number of carrier wave of OFDMA signals, two users
Bandwidth allocation it is identical with signal power allocation proportion.It changes sentence and says it, we are W1=α W and W2=(1- α) W, and bandwidth W1 is distributed to
User 1 and W2 distribute to user 2.The capacity equation for giving two users is as follows
Total capacity R=R1+R2 is identical with the NOMA capacity that equation (4) provides.In short, it declines when subscriber signal is not opposite
Subtract, NOMA and OMA can obtain single user channel capacity and two multiple access technologies in terms of capacity without difference.
When a subscriber signal compared with another signal by different attenuation when, it may appear that between two kinds of multiple access technologies
Difference.The 6dB assuming that 2 signal of user is decayed, and 1 signal of user is not decayed.In this case, OFDMA capacity becomes
NOMA capacity is
Compare this two capacity, it is assumed that α=0.8, P/No=15, therefore single user channel is 4bit/hz, at this time (7)
Formula will be ROFDMA=3.65, (8) formula is RNOMA=3.78, compare the two capacity it may be seen that in specific examples NOMA
Two users' channel capacity is improved 3.5%, further relatively, the results showed that parameter alpha reduces and the attenuation of 2 signal of user is further
During increase, the advantage of NOMA is particularly evident.But the increase of NOMA capacity is also not exclusively free.Since subscriber signal is mutually dry
It disturbs, needs to be iterated detection interference elimination.When a signal is markedly less than another signal, a small punishment can be used
Strong signal is detected, this strong signal is then subtracted from the signal received, to detect small-signal.Then, from receiving
Signal in subtract weak signal, making more reliable second of iteration so as to the symbol to strong signal determines, until performance approaches
Until noiseless transmission.When there is very strong imbalance between two subscriber signals, this process can be more preferable, but when two letters
Number have similar power when, it may appear that convergence problem.
NOMA development at this stage is closely related with the appearance of 5G cellular network research projects.The master that 5G networked physics layers define
It is extensive MIMO, Waveform Design and millimeter-wave technology to want research topic, and multiple access access is the key that Waveform Design composition portion
Point.Many NOMA papers have been delivered in the past few years, a series of this paper more than 15 years or more is based on NOMA.
There is no using NOMA this word in the document of this early stage, but the concept of NOMA and exist with the in-kind portion of this technology
Start to come out within 2000.Here is the brief summary of this work, and basic principle is to use two sets of orthogonal signal waveforms.We
The technology with reference to TDMA and OCDMA is focused on, full signal is set as in TDMA signal and OCDMA signals is arranged to part
Signal.
Consider a simple TDMA system for carrying N number of user, each user obtains a data in N number of symbol is per frame
Symbol.The bandwidth of access channel is NW hertz, if W represents the band needed for the signal of transmission single user when they are individually transmitted
It is wide.Therefore, the program can accommodate N number of user without by any interference.Additional user's (example is accommodated using second signal collection
Such as M user, M<N).Second signal collection is also an orthogonal set, but the two set are not mutually orthogonal.It is specific next
It says, used herein be that second set of OCDMA signal integrate is Walsh Hadamard (WH) sequence of length as N.Using N+M more
In user's multiple access schemes, first group of N number of user does not interfere with each other, and is equally applicable to second group of m user, but
Each user in first group interferes second group of each user, and vice versa.That is here there are one two groups of users
The NOMA schemes interfered with each other, the iterative detection of serial interference elimination need the symbol for being used for detecting transmission.
Fig. 1 illustrates the basic principle of NOMA, illustrates that the superposition of M OCDMA symbols forms the symbol of N TDMA together.At this
The abscissa of a figure represents the time, and Tc is OCDMA chip durations while is also TDMA symbol durations, and T=NTc is
OCDMA symbol durations, this is also the TDMA symbolic blocks duration.The instantaneous power of each OCDMA symbol transmissions is P and every
The instantaneous power of a TDMA transmission is N*P, therefore TDMA symbols and OCDMA symbol energies are E=NPTc=PT. at this
In the TDMA signal collection that sets be complete, and OCDMA signals only use part.This pictures clearly illustrates, as long as M is kept
It is smaller than N, it is possible to which that preliminary decision is made to TDMA symbols.
Let us writes out the equation of transmitting signal.Time index n represents the position of symbol in description TDMA blocks, symbol an
In 1≤n≤N distribute to the user #n, symbol b of TDMAmIn 1≤m≤M distribute to OCDMA user.We write WH sequences
For signal extension wm,n=(wm,1,wm,2........wm,N) wherein m=1,2....M, using this symbol, the signal of transmission can
To be write as (9) in formulaDecomposition in signals transmission
Middle stet energy.Receive the form that signal can be written as：rn=Xn+un, unIt is additional noise, n=1,2,
... the quantity of N. premise OCDMA M users be not it is very big, the distracter in (9) formula compared with TDMA symbol powers still
Very little, received signal sample rnIt send to threshold dector, in transmission symbol anOn enter a judgement, once in all anOn symbol
The judgement of first time iteration is made, according toFrom receive sample of signal in subtract symbol estimated value, each n and
All represent symbol anOn the judgement done, return in (9), by ynIt is rewritten into
Assuming that(10) it can be simplified toSecond link of receiver is by signal
Despreading, and judgement is made on OCDMA symbols, signal despreading is made of following form：
Section 2 parametric noise item and initial noise have identical variance.The first time iteration judgement of OCDMA symbols
It will be in the z by threshold dectorkWhen start.
Once to { bm, m=1,2,3.......M } first time iteration judgement is carried out, then to { am, m=1,2,
3.......M it } carries out that during second of iteration judgement interference can be eliminated.Process is as follows：For each n, calculateWherein each m andIt is for adjudicating bm.Assuming thatAccording to (9) formula, we obtain
To vn=an+un.This signal will be sent to threshold dector in next step, in the case where not interfering with to anIt enters a judgement.
Secondary iteration judgement is significantly more relatively reliable than first time iteration judging process, and it is right like that remain as first time iteration decision steps
{bm, m=1,2,3.......M } second of iteration judgement is carried out, additional iteration can further improve in some cases
Performance, but the result shows that, when m is smaller, twice it is sufficient that iteration.
Above-mentioned concept is more than being suitable for multiple access access.It is equally applicable to single user transmission, therefore has used " channel mistake
Carrying " term describes it.Its basic thought is, once channel using orthogonal signaling schemes (orthogonal transmission of multiuser channel or
The orthogonal multiple access of multiuser channel) it is fully loaded, then it is overloaded by the way that second signal is added to the first signal.Best connection
It closes detection excessively complexity and can not realize, the practical iterative receiver using Interference Cancellation of receiver.Multiple access is accessed, recently
Paper in relation to NOMA is primarily upon the superposition of two subscriber signals, but the processing of Yi Shang TDMA and OFDMA signals is actually more
Go deep into and be the superposition of two user group signals.
Since OFDMA has become the basic Multiple Access scheme of 4G cellular systems, while be also applied to mobile width in 5G by 3GPP
Band (EMB) services, we will describe a frequency domain NOMA scheme, including first group of user for using OFDMA and use more
Carrier wave CDMA (MC-CDMA) is second group of user.Principle is identical with the principle described before, as shown in Fig. 2, frequency dimension replaces
Time dimension.1/N is carrier wave interval in the figure, and the power spectral density (PSD) of OFDMA symbol is N*D watts/hertz, and is folded
The power spectral density for adding MC-CDMA symbols on them is D watts/hertz.
NOMA technologies are further described, consider that OFDMA system has N number of carrier wave, and assume each carrier wave point without loss of generality
The individual user of dispensing.This system accommodates N number of user, provides a QAM symbol to each user in each ofdm symbol
Number.The concept described with early stage model, the MC-CDMA signal collection of second group of user information of carrying is superimposed upon this by we
On OFDMA signals.The early stage concept of model math equation remains unchanged, in range 1<=n<The n designated carrier quantity of=N, by
(9) x providednIndicate transmission in nthSignal on carrier wave.Fig. 3 illustrates a simple block diagram of transmitter.OFDMA is used
That family module exports is the qam symbol vector { a of a N-dimensionaln, n=1,2,3.......N }, MC-CDMA line modules are one
M dimensional vector symbolic vectors { bm, m=1,2,3.......M }.Walsh-Hadamard extensions are by MC-CDMA sign extendeds to N number of
On carrier wave, and export a N-dimensional vector with OFDMA symbol addition of vectors.Resulting block is transmitted to N point
In DFT inverse operations, and cyclic prefix (CP) is inserted into the DFT inverse operations of this N point between continuous inverse DFT block.
The sketch of corresponding receiver has displaying in Fig. 4.In the time domain after removing CP, signal is converted by N points DFT
To frequency domain.Operator { the r of outputn, n=1,2...., N } directly OFDMA symbol is carried out by threshold dector to change for the first time
Generation judgement.As a result it is first time anSymbol judgement valueThese sentencing on the basis of DFT operators are subtracted
It certainly will outputAnd this signal can pass through a Walsh-Hadamard despreader.Solution
Threshold dector will be sent to MC-CDMA signal collection m dimension symbolic vectors { b by expanding the output of devicem, m=1,2,3.......M }
Make the judgement of first time iteration.First time bmDecision value It is Walsh-Hadamard sequences,
{rn, n=1,2,3.......N } this sequence output block will be subtracted, resulting signal is by threshold dector to { an,n
=1,2...., N } carry out second of judgement.Finally, judgement input subtracts these judgements, and the signal of output is Walsh-
Hadamard sequences and threshold judgement is continued through to { bm, m=1,2,3.......M } carry out second of iteration judgement.Such as
Fruit needs this process that can carry out repeatedly further judgement, if actually estimating it is sufficient that M very littles are adjudicated twice.
At this point, on the basis of no significant penalty, for MC-CDMA user on the OFDMA signals that can be added to
Number of signals planning or it is critically important.WH sequences for signal extension are the binary sequences of ± 1 composition.Due to signal
Multiplication item is used in propagationEach MC-CDMA user has the interference of OFDMA userForm.When
MC-CDMA numbers of users reachWhen, peak interference amplitude reaches 1 and OFDMA signal eye diagrams and is closed.In such case
Under, even if without noise, the first time iteration judgement of OFDMA symbol also will appear mistake, it means that corresponding bit error
There are one error floors for rate curve (BER).Therefore, we limit MC-CDMA numbers of users and areAlthough this is not represented strictly
Constraint.In fact, middle replace the iterative receivers of hard decision to will be helpful to accommodate more MC-CDMA users with soft-decision.
In the present invention, we have described represent it as the following strong technology of 5G cellular systems machine communication
One NONA technologies.After the basic principle of this technology is described, we indicated that this technology can essentially trace
By 2000, and the fact that nearest scholars do not appear to notice.This concept appear in delivered at that time it is a series of
In paper, the multiple access access for carrying out iterative detection with two orthogonal signal sets and counteracting serial interference is described.We are first
This has been looked back in technology of first group of user using TDMA and in second group of user using OCDMA.Then 5G honeycombs system is focused on
System as shown in Figure 5, we describes a kind of practical Noma schemes for combining OFDMA and MCCDMA, this method is 5G machines
Device communication provides an attractive solution.In this scenario, when OFDMA occupies all channel resources, NOMA can be with
Regard that OFDMA realizes channel overload and accommodates the means of a large amount of user as.Alternatively, OFDMA and MC-CDMA can be used as holding
Two users with different allocation plans and data rate requirement that receive collect.
The above description is merely a specific embodiment, but protection scope of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, all should by the change or replacement that can be readily occurred in
Cover within the scope of the present invention.
Claims (5)
1. a kind of non-orthogonal multiple cut-in method based on interference cancellation technology, which is characterized in that include the following steps：
Step 1: equipped with N+M user, using the orthogonal collecting systems of the OFDMA with N number of user as first group of OFDMA signal collection,
That first group of OFDMA signals collection exports is the qam symbol vector { a of N-dimensionaln, n=1,2,3.......N }, wherein, symbol anIt represents
Distribute to the OFDMA symbol of nth user；
M user is accommodated using MC-CDMA signals collection as second group, MC-CDMA signal collection is a m dimension symbolic vector
{bm, m=1,2,3.......M }, wherein symbol bmThe symbol for distributing to m-th of MC-CDMA user is represented, by MC-CDMA symbols
On vector extensions to N number of carrier wave, obtain a N-dimensional vector with OFDMA symbol addition of vectors, that is, emit signal xnFor：Wherein signal extension wm,n=(wm,1,wm,2........wm,N) it is Walsh-Hadamard sequences；
OFDMA signals collection in MC-CDMA signals collection using orthogonal multiple access techniques with being transmitted, between OFDMA signals collection and MC-CDMA signal collection
Using non-orthogonal multiple technical transmission；
Step 2: the symbol to detect OFDMA signals and MC-CDMA signals is adjudicated by the iteration of serial interference elimination；Specifically
It is as follows：
Received signal is rn, rn=Xn+un, unIt is additional noise, rnFrequency domain is transformed by N points DFT and passes through threshold test
Device is to OFDMA symbol, that is, anValue of symbol carries out first time iteration judgement, obtains symbol judgement value For
anSymbol judgement value；Subtracting the judgement on the basis of DFT operators will exportynPass through one
Walsh-Hadamard despreaders simultaneously tie up symbolic vector { b with threshold dector to MC-CDMA signal collection mm, m=1,2,
3.......M the judgement of first time iteration } is made；bmCourt verdict is
It is Walsh-Hadamard sequences,It is bmSymbol judgement value, { rn, n=1,2,3.......N } it subtractsResult pass through threshold
It is worth detector to anIt carries out second of value of symbol judgement and obtains second of anSymbol judgement value；Finally, rnSubtract second of an's
Symbol judgement value, the signal obtained are Walsh-Hadamard sequences and continue through threshold dector to bmCarry out second
Sub-symbol value is adjudicated, and obtains second of bmSymbol judgement value.
2. a kind of non-orthogonal multiple cut-in method based on interference cancellation technology according to claim 1, which is characterized in that
In step 1, first group of OFDMA signal collection has N number of carrier wave, and sets each carrier wave and distribute to individual user, is accorded in each OFDM
In number a qam symbol is provided to each user.
3. a kind of non-orthogonal multiple cut-in method based on interference cancellation technology according to claim 1, which is characterized in that
In step 1, the bandwidth of access channel that the OFDMA signals with N number of user integrate is NW hertz, if OFDMA signal collection
W represents the bandwidth needed for the signal of transmission single user when signal individually transmits.
4. a kind of non-orthogonal multiple cut-in method based on interference cancellation technology according to claim 1, which is characterized in that
Limitation MC-CDMA numbers of users are less than or equal to
5. a kind of non-orthogonal multiple cut-in method based on interference cancellation technology according to claim 1, which is characterized in that
It is extended using Walsh-Hadamard and expands to MC-CDMA symbolic vectors on N number of carrier wave.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711419394.4A CN108134759B (en) | 2017-12-25 | 2017-12-25 | Non-orthogonal multiple access method based on interference cancellation technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711419394.4A CN108134759B (en) | 2017-12-25 | 2017-12-25 | Non-orthogonal multiple access method based on interference cancellation technology |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108134759A true CN108134759A (en) | 2018-06-08 |
| CN108134759B CN108134759B (en) | 2020-10-16 |
Family
ID=62392842
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711419394.4A Active CN108134759B (en) | 2017-12-25 | 2017-12-25 | Non-orthogonal multiple access method based on interference cancellation technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108134759B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617662A (en) * | 2019-01-04 | 2019-04-12 | 浙江大学 | Method for joint optimization of resources based on underwater sound OFDM-NOMA system down link |
| CN111432421A (en) * | 2020-04-02 | 2020-07-17 | 宁波艾欧迪互联科技有限公司 | 5G communication test instrument multi-terminal-to-be-tested synchronous test method |
| CN111600826A (en) * | 2019-11-01 | 2020-08-28 | 哈尔滨工业大学 | Non-orthogonal access-transmission communication method in communication network |
| CN112087812A (en) * | 2020-08-29 | 2020-12-15 | 浙江工业大学 | Power back-off-based mMTC non-orthogonal random access method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105610560A (en) * | 2015-12-28 | 2016-05-25 | 哈尔滨工业大学 | Construction method of full duplex relay system based on sparse code multiple access |
| CN107026805A (en) * | 2016-01-29 | 2017-08-08 | 清华大学 | Non-orthogonal multiple accesses the method for reseptance and device of Transmission system |
| CN107171770A (en) * | 2017-05-25 | 2017-09-15 | 深圳清华大学研究院 | Uplink multi-users non-orthogonal multiple cut-in method |
| CN107466099A (en) * | 2017-07-31 | 2017-12-12 | 北京邮电大学 | A kind of interference management self-organization method based on non-orthogonal multiple access |
-
2017
- 2017-12-25 CN CN201711419394.4A patent/CN108134759B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105610560A (en) * | 2015-12-28 | 2016-05-25 | 哈尔滨工业大学 | Construction method of full duplex relay system based on sparse code multiple access |
| CN107026805A (en) * | 2016-01-29 | 2017-08-08 | 清华大学 | Non-orthogonal multiple accesses the method for reseptance and device of Transmission system |
| CN107171770A (en) * | 2017-05-25 | 2017-09-15 | 深圳清华大学研究院 | Uplink multi-users non-orthogonal multiple cut-in method |
| CN107466099A (en) * | 2017-07-31 | 2017-12-12 | 北京邮电大学 | A kind of interference management self-organization method based on non-orthogonal multiple access |
Non-Patent Citations (1)
| Title |
|---|
| 郭永娜: "SG非正交多址接人中干扰消除技术研究", 《通信***与网络技术》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617662A (en) * | 2019-01-04 | 2019-04-12 | 浙江大学 | Method for joint optimization of resources based on underwater sound OFDM-NOMA system down link |
| CN109617662B (en) * | 2019-01-04 | 2020-05-12 | 浙江大学 | Joint resource optimization method based on underwater sound OFDM-NOMA system downlink |
| CN111600826A (en) * | 2019-11-01 | 2020-08-28 | 哈尔滨工业大学 | Non-orthogonal access-transmission communication method in communication network |
| CN111432421A (en) * | 2020-04-02 | 2020-07-17 | 宁波艾欧迪互联科技有限公司 | 5G communication test instrument multi-terminal-to-be-tested synchronous test method |
| CN111432421B (en) * | 2020-04-02 | 2024-03-15 | 宁波大学 | Synchronous test method for multiple tested terminals of 5G communication test instrument |
| CN112087812A (en) * | 2020-08-29 | 2020-12-15 | 浙江工业大学 | Power back-off-based mMTC non-orthogonal random access method |
| CN112087812B (en) * | 2020-08-29 | 2022-09-23 | 浙江工业大学 | Power back-off-based mMTC non-orthogonal random access method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108134759B (en) | 2020-10-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108134759A (en) | A kind of non-orthogonal multiple cut-in method based on interference cancellation technology | |
| Han et al. | Filter design for generalized frequency-division multiplexing | |
| Kim et al. | A multicarrier CDMA system with adaptive subchannel allocation for forward links | |
| KR101335968B1 (en) | Method of ofdma tone interference cancellation | |
| Sari et al. | On the foundation of NOMA and its application to 5G cellular networks | |
| CN106385300A (en) | Uplink NOMA power distribution method based on dynamic decoding SIC receiver | |
| Chong et al. | Achievable rate upper-bounds of uplink multiuser OTFS transmissions | |
| CN102035568A (en) | Method and device for eliminating interference in mobile communication system | |
| Pinto-Benel et al. | Throughput analysis of wavelet OFDM in broadband power line communications | |
| Jinqiu et al. | Emerging 5G multicarrier chaotic sequence spread spectrum technology for underwater acoustic communication | |
| Faisal et al. | Simulation based Performance Analysis of MC-CDMA and CDMA over Rayleigh fading channel | |
| Morelli et al. | A novel prefiltering technique for downlink transmissions in TDD MC-CDMA systems | |
| JP4284037B2 (en) | Multi-user detection method and receiver | |
| Sari et al. | Some novel concepts in multiplexing and multiple access | |
| Alsaba et al. | On the sum rate of MCM-based NOMA and MCM-based OMA systems | |
| Abudoukeremu et al. | A novel multicarrier CDMA scheme with interference free performance in very large delay spread | |
| Mohammed et al. | NOMA-NR-FOFDM Performance Enhancement-Based Sub-band Filtering | |
| Dhaliwal et al. | BER based Performance Analysis of MCCDMA over Multipath Channels | |
| Oh et al. | Sub-band rate and power control for wireless OFDM systems | |
| CN101778070A (en) | Two-stage spread spectrum OFDM (Orthogonal Frequency Division Multiplexing) self-adapting code allocation method and system under zero-forcing algorithm | |
| Shi et al. | Molecular Code-Division Multiple-Access: Signaling, Signal Detection and Performance | |
| Tonello et al. | Capacity considerations on the uplink of a multi-user DMT OFDMA system impaired by time misalignments and frequency offsets | |
| Singh | SC-FDMA based systems to Reduce PAPR by using a Modified Companding Scheme | |
| Jang et al. | Self-encoded multi-carrier spread spectrum with iterative despreading for random residual frequency offset | |
| Yonis et al. | Investigation of pattern division multiple access technique in wireless communication networks |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |