CN103368717B - The method and apparatus of multiple access to communication system - Google Patents
The method and apparatus of multiple access to communication system Download PDFInfo
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Abstract
There is disclosed herein the method and apparatus for the multiple access to communication system communicated with multiple user subjects simultaneously.Signature sequence is for identifying the signal sent to different user entity and/or the signal sent from different user subjects.In the statement of example matrix, signature sequence can be described as the element of signature sequence matrix column, and described signature sequence matrix is low density matrix, and the nonzero element of any single file of matrix constitutes the difference element of element finite aggregate.
Description
Technical field
The present invention relates to the communication of multiple user subjects of multiple access to communication system.Particularly to the knowledge between signal
Not, communication session or this type of system pass through the connection that signature sequence is relevant to various user subjects.
Background technology
Information symbol spread spectrum is a kind of common methods being realized frequency diversity by multipath frequency-selecting decayed propagation channel.It is also to use
Shared communication channel provides, to multiple users (user subject), the method that multiple access accesses simultaneously.Have based on user's specific spread spectrum code
The spread spectrum communication system of multiple access access function be commonly referred to CDMA (CDMA) system (spread spectrum code also commonly referred to as spread label
Name or signature sequence, but hereinafter " signature sequence " is used as the generic term of this category code/sequence/signature).
Multiple access access function is cross-correlation based on relatively low between signature sequence (perfect condition is zero).But multipath transmisstion can reduce
The performance of cdma system, because the multiple reflections of each signature sequence element can cause the signature sequence distortion of transmission.Receive
The cross-correlation of distortion signature sequence will the minima of off-design.
The while that OFDM (OFDM) transmission system can being, multiple-access communication provides alternative transmission method.OFDM system
The transmission symbol that system is each block uses transmission Cyclic Prefix, makes multidiameter fading channel each quadrature detection in the receiver secondary
Single footpath channel it is shown as on carrier wave.Thus can use less complicated receptor in single carrier system.
But, ofdm system cannot directly utilize the potential diversity gain of multidiameter fading channel.Therefore have developed a kind of system,
It is referred to as MC-CDMA or spread-OFDM systems, on the one hand, this is diversity gain and cdma system multiple access access function
Compromise, on the other hand, it is the compromise of the diversity gain simplicity with ofdm system receptor.In the side that these systems use
In method, it is specific that each information symbol (may be obtained by Error Correction of Coding) is multiplied by the user being made up of the sequence of m spread symbol
Signature (commonly referred to chip).Afterwards, these information symbols are transmitted by m quadrature subcarrier, wherein the expansion of every chip
Frequently modulation one is specified subcarrier by information symbol.Similar with ofdm system, the transmission information symbol for each piece is transmitted
Cyclic Prefix.
Although MC-CDMA system has the advantageous property of CDMA and OFDM, but this type of system also inherits CDMA
One of them shortcoming of system.That is, the multiple access in time dispersive channel accesses intersymbol interference.
In such systems, (receptor) detection method that can be minimized by symbol error probability is maximum a posteriori probability (MAP)
Detection method.But for actual user, the usual too complex of this detection method, therefore have developed various suboptimum
Multiuser Detection (MUD) method.But the MUD method of these type of suboptimums all is all maximum close to optimum associating in certain mode
Probable (ML) detects.MUD receptor is generally the most sufficiently complex, this complexity along with signature length increase exponentially
Ground increases.
On traditional approach, MUD method is independent of signature design.Generally affect MUD and implement unique side of complexity
Face is the quantity of signature.But MUD complexity can be reduced by specially designed signature.
One this type of trial includes low-density spread spectrum (LDS) signature.The LDS signature of length m is m spread symbol (chip)
Sequence, therefore wcChip is not equal to zero, and m-wcEqual to zero, meet w simultaneouslyc<<m。
In a prior art example, the set of n LDS signature can obtain from single common signature, comprises m-wcIndividual zero it
Rear wcIndividual continuous BPSK symbol.Remaining n-1 the signature obtained is as the cyclic shift of common signature.
Once generating all cyclic shifts, the chip of all signatures all can arrange according to single common arrangement vector in the same manner
(interlocking), thus by the nonzero element of each signature being placed in set as far as possible the diversity improving in fading channel
Gain.The signals reverse arrangement received, then uses MAP detection method make it equalize and de-spread.
Other prior art examples of iterative MUD based on LDS signature are based on belief propagation (BP) algorithm.This
MUD algorithm is intended to by iteration the value of the confidence close to MAP detection algorithm, and assumes that signature sequence is referred to as low-density parity-check
Test the low density matrix of (LDPC) type.The complexity of belief propagation algorithm is well below MAP detection algorithm, although the former is still
So depend on the special signature sequence being currently in use, but its performance can be close to the performance of MAP detection algorithm.
Therefore, there is now the signature sequence matrix being made up of the signature sequence comprising many zero.The nonzero element of prior art
Value stochastic generation.(each row of LDS index matrix are multiplied by a unit envelope plural number with random user particular phases.)
Summary of the invention
There is one in communication system to need, the most also method and apparatus is proposed requirement, wherein signature sequence can be with than elder generation
The mode that front technology becomes apparent from generates, especially for the situation of overload.
The target of the preferred embodiments of the present invention is to provide for a kind of multiple access eliminated or at least reduce part foregoing problem
Access communications system and method.
Meanwhile, the target of the embodiment of the present invention be at least reduce in prior art to communication system transient state and time relevant the asking of varying load
Topic.
The simplest mode for having the employing of a kind of technical solution to compare prior art, by limiting signature sequence matrix S
Various possible element championship, set up and there is the signature sequence of satisfied systematic function.
Other features and the advantage of the present invention will be proved from the detailed description of following preferred embodiments and additional patterns, these
Embodiment and figure provide the most by way of example, do not constitute any type of restriction.
Accompanying drawing explanation
Fig. 1 discloses the typical multiple access to communication system that can use the present invention wherein.
Fig. 2 discloses the low-density signature sequence matrix example of multiple access system based on OFDM.
Fig. 3 a-c discloses the execution example according to one embodiment of the invention gained.
Fig. 4 a-c discloses the execution example according to second embodiment of the invention gained.
The execution example according to other embodiments of the invention gained that Fig. 5 discloses.
Detailed description of the invention
Signature sequence to be generated, direct solution is once to generate n user's designated phase by the search of computer trial and error method,
Producing minimum information transmission error rates, or use on-line mode to generate n user's designated phase, wherein, each user is transmitted
During data, emitter will generate a new stochastic signature sequence.This completes the most in a pseudo-random fashion, and receptor is any
Time both know about signature sequence.
But, the performance-relevant problem detecting the system of BP detection method with applying this type of low-density signature sequence to be intended to is,
This type of signature sequence that is random or that use trial and error method to generate can cause uncertain performance, and result is exactly that different users may root
Different performances is experienced according to championship and the special matrix structure of signature sequence.
In the case of an overload, signature sequence is more than chip.In the presence of not having orthogonal signature set, interference is intrinsic.
In an exemplary situation, each user may apply the single signature collection being particularly allocated in setting up connection procedure,
The transient state number of signatures currently used with other users is unrelated.
If using structurized Deterministic Methods during the generation of low-density signature sequence, by highly beneficial.Additionally,
When using the detection of BP detection algorithm and in the case of an overload, preferable state is to use Deterministic Methods to generate one performance to the greatest extent
May be close to the system of single user binding.
It is unique that the restriction (nonzero element of any of which single file constitutes difference element) using signature sequence matrix adds realization
The probability of decodability, i.e. the message received can be decoded as single unique possible explanation, especially for overload system
System.
Once system overload, i.e. the quantity of concurrent user exceedes the quantity of available signatures sequence, will apply receiver terminal
Other requirements.The number of signatures of use is equal to signing to apply BP detection algorithm to usually require that in (overload) multiple access system
The quantity of the row of name matrix S, i.e. transmit all signatures all the time.But in many utility systems, the quantity of user and user
Data rate be continually changing, which imply that if BP detection algorithm is used in this type of system, then every kind may quantity also
Hair family/data rate all should have individually (that is, different) signature matrix.This just requires the signature used in each system
Number change time it is necessary to the new signature matrix of all relevant user subjects distribution with send signal.Obviously, this type of system
In control signaling can consume a large portion resource.
But signature sequence matrix used according to the invention can allow any number of signature sequence using matrix to provide, i.e. not
Ask and use all sequences all the time.It is to say, the application of the invention, LDS-CDMA system based on SP detection algorithm
User and/or the data rate of variable number only can be supported by a signature matrix.
As it has been described above, signature sequence comprises multiple symbol (chip).These signature sequence signals or coefficient are preferably used matrix
Row represent, the most so can use following relatively simple system description.For simplicity, therefore, in following description
It is described as signature sequence matrix column with signature sequence in claim.Certainly, signature sequence can also be retouched by other modes various
State, such as, the row of matrix, or single column or row vector.But this type of variant can be rewritten as matrix, reason be in this article it
It is to use in the way of simple and clear.Therefore during these variants will be contained in the definition of signature sequence matrix, for following description and right
Requirement.
Additionally, the definition following famous set theory " gathered " in term used herein, i.e. each element of set is only
One, and set does not has two identical elements.Therefore, it is integrated in following description and claim comprises (example when one
As) W element time, it follows presented above, i.e. this set comprises the element that W is different.
Fig. 1 shows the simplification example architecture of the multiple access to communication system 100 according to gained of the present invention.Although being applicable for use with
The various multiple access to communication system of signature (spread spectrum) sequence, such as carrier wave communication system (such as, WCDMA system),
But hereinafter, the present invention will be described with reference to the system using OFDM structure.
It can be seen that many user subjects 102-109(such as have the mobile phone of communication function, smart mobile phone or the palm
Computer) all utilize fixed wireless access node (such as wireless base station 101) to communicate.User subject 107 preferably comprises one
A little communicators, including transmitter circuit 1071 or acceptor circuit 1072, however not excluded that comprise both simultaneously.For processing,
Such as signal processing or logical process, figure further comprises process circuit 1073.If using mobile phone as wireless communication system
(such as), then radiating circuit 1071 or reception circuit 1072 should comprise radio circuit.For non-radio frequencies system (such as, light
System), the carrier frequency in addition to radio frequency may be more interesting, it is thus possible to can comprise the circuit of corresponding frequencies.Wireless access
Node is responsible for the process (such as modulation and spread spectrum) of physical layer, and depends on special communication system, has indicated that radio access node,
Such as, base station, NodeB or eNodeB.Wireless base station 101 preferably comprises some communicators, including transmitter circuit 1011
Or acceptor circuit 1012, however not excluded that comprise both simultaneously.For processing, figure further comprises process circuit 1013.If
Use wireless base station, then radiating circuit 1011 or reception circuit 1012 should comprise radio circuit.For non-radio frequencies system, except penetrating
Carrier frequency outside Pin may be more interesting, it is thus possible to can comprise the circuit of corresponding frequencies.Generally, communication network
It is made up of a wireless access network (RAN) and a core net.But for simplicity, as illustrated, only disclose (part)
Wireless access network.Core net will not be described further.Although only disclose a radio access node in figure, but multiple access
Communication system generally comprises many radio access nodes, thinks that user subject provides mobility.Generally, radio access node can lead to
Cross the wave point in a certain coverage to process communication.
Communication between user subject 102-109 and radio access node use signature sequence in up-link and/or downlink
Row (spread spectrum node), to distinguish the signal being sent to different user or sending from different user.
As the typical case of cdma system, either (such as base station 101, as explorer and to user, (user is real in base station
Body) distribution signature sequence, such as in the case of establishing connection) or standardized flow process may ensure that what user used
It is unique signature sequence, it is not necessary to clearly communicate in advance between base station with user.
Although being applicable to carrier wave communication system, but in following exemplary embodiment, the signature sequence according to gained of the present invention will ginseng
Examine ofdm system to be described.Signature sequence is used to allow multidigit concurrent user can use pair in OFDM type system
Carrier wave.
About the system of Fig. 1, communication system generally use signature sequence to distinguish the signal that different user sends, according to hereafter may be used
To define a kind of signal model.If system comprises n signature, and each signature packets is containing m element (chip), then may be used
Having the matrix S(of m row n row i.e. with definition, dimension is the matrix of mxn), wherein n signature sequence of n row definition is (logical
Cross subscriber equipment to transmit, UEl, l=0 ..., n-1)
If additionally, with n signature name sequence xl, l=0 ..., each information symbol being associated in n-1 according to row to
Amount form x arranges, then comprise n the received signal vector receiving chip value, by additive white Gaussian noise (AWGN)
After channel, can be written as:
r=Sx+n (1)
Wherein, n represents the additive white Gaussian noise of plural number.If (by fading channel, each chip is multiplied by accordingly
Channel coefficients.)
If quantity u of concurrent user is equal to or less than number of chips m of signature sequence, then can find orthogonal signature sequences all the time
Set, thus relatively low inter-user interference (if using awgn channel, be zero in interference) is provided.
About overload system, on the other hand, i.e. at u > in the case of m, signature sequence is more than chip, does not the most now have
Orthogonal signature set exists, and interference is intrinsic.
As it has been described above, this can make detection ideal signal become more difficult, generally, detection method can propose other want
Ask.But these requirements can (the most to a certain extent can) by meticulously selecting signature sequence to be used to relax.Inspection
The complexity of survey method is the lowest, and such as, BP detection method may conform to the complexity that this type of is relatively low, and is suitable for
Any selection in signature sequence actual value.
The present invention relates to this type of selection of signature sequence, particularly to can be written as the signature sequence of low-density (sparse) matrix (i.e.,
Main by zero matrix filled), the quantity of the nonzero element of any row of the most wherein said matrix is far smaller than this row null element
The quantity of element, and the quantity of nonzero element that arbitrarily arranges of wherein said matrix is far smaller than the neutral element quantity of these row.Additionally, it is every
Row and an each column at least element must comprise nonzero element.
Fig. 2 discloses the concept example of the low-density signature sequence matrix of system based on OFDM.It means that be not by
Signature sequence is used for spreading the symbol of unique user entity at whole channel spectrum (the most in wcdma),
But utilize radio access node to be used for signature sequence modulating which subcarrier will be particular user entity will use in the communications.Root
According to the example disclosed, filling (non-blank-white) the positional representation nonzero element in Fig. 2 matrix.Additionally, the allusion quotation disclosed according to Fig. 2
, there is 24 signature sequences, each modulated 2 subcarriers, 24 subcarriers altogether in model matrix, i.e. system is only supported
12 subcarriers are used to be simultaneously transmit to up to 24 user subjects.It is of course possible to use the label comprising other quantity nonzero elements
Name sequence, i.e. signature sequence may use single nonzero element, other signature sequences then use three, four or more
Many nonzero elements.
As it has been described above, use the performance of the system of this matroid to depend greatly on the spy that signature sequence nonzero element sets
Definite value.
Low-density signature sequence according to gained of the present invention is the signature matrix with the row determining structure.The row of S are exactly to pass afterwards
The signature that transfer device and reception equipment are used.
According to the present invention, signature matrix S uses following structure: as it has been described above, S is low density type.Such as, S uses
Building mode is it may be that it only has non-zero entity in the position indicated by low-density checksum oriental matrix.This matrix
Design meets in the past several years (channel coding theorem) widely studied under a diverse background.In S, the quantity of row is
The sum of available signatures sequence in community or system, and in S, the quantity of row is the chip that all transmission information can spread wherein
Quantity.
According to the present invention, it has been recognized that and can improve systematicness by distributing some values to the nonzero element of matrix S
Can, the mode of employing is to there is not identical two nonzero element in single row, i.e. all elements in single row is all different
's.Additionally, the value of the nonzero element of matrix S is the championship set C of limited plural number, element, i.e. these values are from Finite Number
The probable value of amount is elected.The example of this type of championship set is by provided below.
Matrix (wherein, the nonzero element of any single file constitutes difference element) is used to have the advantage, that as it has been described above, limit
The decodability attribute of system can be improved, particularly for overload system.Meanwhile, for comparing prior art, it is easier to build
Vertical signature sequence realizes satisfied systematic function.
Foregoing can also be limited, in order to limit further the selection of the nonzero value of S, because the non-zero often gone not only in S
Element must be different, but also must select the championship set C that signs, so that its scale shows equal in the single file of S
The maximum quantity of nonzero element
For unique decodability, this can verify according to following methods:
Unisolvent code by row: for the different vectors of modulation intelligence symbol, nonzero element total in the often row of S
Number is all different (the most each non-zero row element utilizes any information symbol in q information symbol championship to modulate).(institute
The vectorial Sx having is different in each element.)
If meeting this condition, then for the different vectors of modulation intelligence symbol, the sum of all row of S (uses q letter
Any information symbol in breath symbol championship is modulated) it is all different.(it is all different, then if all of vector Sx
Vector in each element is the most different.) in other words, if S has the unisolvent code by row, then S also will tool
There is unisolvent code.
Assume to meet above-mentioned condition, then for the different vectors of modulation intelligence symbol, any number of often row nonzero element
Sum the most different (any information symbol during wherein, often row nonzero element uses q information symbol championship is modulated).
This makes for the different vectors of modulation intelligence symbol, and the sum of any line number of S (uses appointing in q information symbol championship
Meaning information symbol is modulated) it is different, so that S has unisolvent code for any number of active user,
Therefore it may be used for expansible system.
The unisolvent code of signature sequence matrix S can be by coming the search likely combined transmitting data in vector
Test.
The signature sequence championship that meet one or more above-mentioned condition is described below.
Meeting the colleague of above-mentioned lower limit, the size of signature championship set is the least.That is, signature championship set C's is big
The little maximum quantity at least equal to the nonzero element that can show in S a row.
A kind of method of the element defining described element set C is, this element can describe by the value of mathematic(al) representation, this table
Reach formula to be made up of a cycle or essence periodic function.
Such as, this can be met by the signature championship set C being made up of (a part of) PSK-championship, according to:
Wherein, W is the number of elements of signature championship set C, such as, and the maximum of the nonzero element occurred in certain a line of S
Quantity.
If S uses these characteristics to constitute, then, for comparing the signature sequence of arbitrarily (trial and error method) prior art, can obtain
Better performance.As mentioned below, this is especially true for overload system, i.e. when in described signature sequence matrix,
The quantity of row is far longer than capable quantity.
When overload, systematic function is generally measured with the gap with single user scope and (is the most only applied a user's
The performance of system there will be no inter-user interference).According to the selection of signature sequence set, this gap may less or bigger (i.e.
Make for MAP detection method).
Under the conditions of muting, use MAP and BP detection algorithm all should detect modulated different LDS clearly
The information symbol of signature.If the signature of modulation represents the code of unisolvent code, then this is also possible to.
If the P in equation (2) selects sufficiently large, then sequence is likely to have unisolvent code.On the other hand, best
The value being P is the least, because the point of signature championship will launch in unit circle, this is beneficial to additionally select to transmit signal
Minimum range feature.Therefore, the nonzero element of matrix S can perfectly and advantageously comprise unimodular secondary element, or least substantially at
Comprise unimodular secondary element.For the angle of power control point, use the element with identical or substantially identical modulus highly beneficial.
This means in the present embodiment, the selection of nonzero value would be limited to relatively limited signature championship.
Such as, can the electing as of P in (2):
P=qW (3)
P=q·W (4)
Wherein, q is the maximum information championship size that described active user uses, i.e. the specific modulation mode being currently in use provides
The quantity of symbolic, such as, be 2 in BPSK, being 4 etc. in APSK, (this information championship can (such as)
It is any one in following group: M-PSK, M-QAM).Additionally, min (q, W) is the minimum number of q and W, and gcd (q, W)
It it is the greatest common divisor of q and W.
In many Practical Communication Systems, the quantity of user is variable, i.e. system expandable.Such as, in mobile communication system
In the up-link of system, multiple users send signal simultaneously to same base station.Although the quantity of the signal received is variable simultaneously,
But can determine on base station receiver all the time.Additionally, in synchronizing moving system, such as LTE, synchronicity allows to use BP
Detection.
Signature sequence according to gained of the present invention allows to arrange any amount of S to be used as signature sequence, i.e. do not require all signatures
Sequence uses the most simultaneously.So it is also an advantage that be exactly, it is only necessary to when described user subject is connected with communication system foundation
Distribution once signed sequence, it is possible to the sustained period of this connection retains always.
As it has been described above, use BP detection to have a lot of benefit, and in order to make the BP detection can use LDS signature sequence
In spread communication system practical, it is necessary to ensure that this signature sequence have in the system of arbitrary extension unisolvent code (ginseng
See above).Secondly, belief propagation receptor must support the system expandability.Prior art does not carries for this two large problems
For any solution.But the present invention accomplishes！
The structure selecting the S of above-mentioned P value passes through simulating, verifying, it was demonstrated that generally have for a large amount of LDPC oriental matrixs
There is unisolvent code
In other embodiments, described signature sequence matrix S is restricted further, so that described matrix S's is the most single-row
Nonzero element also constitute the difference element of described element finite aggregate C.
In Fig. 3 a-c, 4a-c and Fig. 5, have been presented for signature sequence (3) and (4) and transmit data all the time all users
In the case of simulation result.Performance is the probability of the average symbol mistake for u users all in system and proposes.
Fig. 3 a-c shows the BPSK performance of the system of 150% load, and wherein the size of signature sequence is respectively 10x15,14x21
And 16x24.
The performance of signature sequence design (3) and (4) surpasses optional signature sequence in prior art, close to tenth of the point shellfish
Within single user scope.
Fig. 4 a-c shows three kinds of QPSK situations with 150% load, wherein the size of signature sequence be respectively 10x15,
14x21 and 16x24.The performance of signature sequence design (4) surpasses optional signature sequence in prior art, and many decibels are equal
There is higher SNR.
Can be seen that from QPSK simulation result, it is evident that compared with single user performance, multi-user will meet with performance loss.This
The data throughout causing each user will reduce.On the other hand, system will increase by the user of 50%, and therefore community gulps down
The amount of telling, the summation of all handling capacities also will increase.
Fig. 5 shows the performance of (10, the 15) system with QPSK modulation, and being specifically designed for 15 may only have 10 in code
The situation of the instantaneous use of code, i.e. the extension systematic function of QPSK, 150% load (10,15) system, momentary load is 100%.
In simulations, 5 (randomly choosing) signature sequences are had not used by any user.This example is according to the present invention is directed to scale
The situation of system lists the advantage of signature sequence.
Although the present invention is relevant to specific embodiment therein or characteristic, but it still can be revised.This specification is intended to the present invention
Any variant, use, use or implementation；It is not excluded for enabling the device of software and equipment, special by the process of different order
Levy or the non-key or mutual non-proprietary combination of embodiment；In the range of following appended claims, generally, this
Bright professional and technical personnel grasps the operation principle of the present invention.
As non-exclusive example, although the present invention has disclosed relevant to above-mentioned spread-OFDM systems, but the present invention is the suitableeest
For using signature sequence to distinguish any system of user.
Claims (17)
1. a multiple access to communication system, described communication system is used for communicating with multiple user subjects simultaneously, described communication system
System uses signature sequence to identify the signal sent to different user entity and/or the signal sent from different user subjects, wherein
Described user subject, when being in described communication simultaneously, it is specific that each user subject is assigned at least one user subject
Signature sequence, wherein said signature sequence is the column element of signature sequence matrix S, and described signature sequence matrix S is low-density square
Battle array, this communication system has the feature that
Described signature sequence matrix S is such a matrix, and the nonzero element of any single file of wherein said matrix S has constituted
Mutually different element in limit element set C；
Wherein, the element of described finite element set C is the element described by the value of mathematic(al) representation, and this expression formula is by one
Almost-periodic function is constituted.
System the most according to claim 1, is characterized in that each element of described finite element set C comprises one
Unit modulus complex value.
System the most according to claim 1, is characterized in that the number of the signature sequence defined by described signature sequence matrix S
Amount exceedes the quantity of element in described each signature sequence.
System the most according to claim 1, is characterized in that number of elements W of described finite element set C is equal to described
The maximum quantity of the nonzero element in the single file of signature sequence matrix S.
System the most according to claim 1, is characterized in that the value of the element of described finite element set C depends on transmission
In the symbol championship of modulation system that is currently in use.
System the most according to claim 1, is characterized in that, described finite element set C is defined as
W is the number of elements of described element finite aggregate C；
Wherein P is equal to: the P=q in following set of equationW, P=q W,Wherein,
Q is the maximum symbol quantity of the symbol championship of the modulation system being currently in use, and wherein min (q, W) is the minimum number of q and W,
Gcd (q, W) is the greatest common divisor of q and W.
System the most according to claim 1, is characterized in that the nonzero value of described signature sequence matrix S makes for simultaneously
Transmitting subscriber identify symbol any to different vector x 1 and x2, vector Sx1-Sx2 does not comprise neutral element.
System the most according to claim 1, is characterized in that the nonzero value of described signature sequence matrix S is so that for same
Time transmitting subscriber identify symbol any to different vector x1And x2, vector Sx1It is different from vector Sx2Value.
9., according to the system according to any one of claim 1,5,7,8, it is characterized in that the user profile of described system transfers
Symbol comprises the symbol in any modulation system of following group: M-PSK, M-QAM.
System the most according to claim 1, is characterized in that the instantaneous number u of described user subject changes often so that
Sometimes u is less than quantity n of the row in described signature sequence matrix.
11. systems according to claim 1, is characterized in that described signature sequence matrix S is such a matrix, wherein
The most single-row nonzero element of described matrix S constitutes mutually different element in described finite element set C.
12. systems according to claim 1, is characterized in that each chip of signature sequence is for modulating the pair of ofdm signal
Carrier wave.
13. transmission methods in multiple access to communication system, described communication system is used for communicating with multiple user subjects simultaneously,
It is characterized in that the method comprises:
-use signature sequence to identify the signal sent to different user entity and/or the letter sent from different user subjects
Number, wherein said signature sequence is the element of the row of signature sequence matrix S, and described signature sequence matrix S is low
Density matrix, and
-distribute at least one user subject specific described signature sequence to the user subject communicated with described communication system simultaneously
The signature sequence of column matrix S, described signature sequence matrix S is such a matrix, wherein said matrix S's
The arbitrarily nonzero element of single file constitutes mutually different element in finite element set C；
Wherein, the element of described finite element set C is the element described by the value of mathematic(al) representation, and this expression formula is by one
Almost-periodic function is constituted.
14. transmission methods according to claim 13, is characterized in that signature sequence is only in described user subject and communication system
Set up when connecting distribution once, and retain at the sustained period of this connection always.
A kind of device of 15. multiple access to communication system, is characterized in that described communication system is for leading to multiple user subjects simultaneously
Letter, described communication system uses signature sequence identify the signal sent to different user entity and/or send out from different user subjects
The signal gone out, wherein said user subject, when being in described communication simultaneously, each user subject is assigned at least one
The specific signature sequence of user subject, wherein said signature sequence is signature sequence matrix column element, described signature sequence matrix
S is low density matrix, and this device has the feature that
Described signature sequence matrix S is such a matrix, and the nonzero element of any single file of wherein said matrix S has constituted
Limit mutually different element in element set C, and described device includes telecommunication circuit；
Described telecommunication circuit is according to the signature sequence Transfer-matrix discernible signal corresponding with the signature sequence of application；
Wherein, the element of described finite element set C is the element described by the value of mathematic(al) representation, and this expression formula is by one
Almost-periodic function is constituted.
16. devices according to claim 15, is characterized in that, telecommunication circuit comprises carrier frequency circuit.
17. devices according to claim 15, is characterized in that comprising for determining and the signature sequence pair of signature sequence matrix
The one or more transmitting signals answered or the process circuit receiving signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310331640.6A CN103368717B (en) | 2009-03-09 | 2009-03-09 | The method and apparatus of multiple access to communication system |
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| EP3226636B1 (en) | 2014-12-22 | 2020-07-29 | Huawei Technologies Co., Ltd. | Method and device for transmitting indication information |
| US10887926B2 (en) | 2017-10-26 | 2021-01-05 | Mediatek Inc. | Configuration of non-orthogonal multiple access transmissions in a wireless communication system |
| US10924167B2 (en) * | 2018-02-01 | 2021-02-16 | Qualcomm Incorporated | Forward compatible design for non-orthogonal UE signature sequences |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1257356A (en) * | 1998-07-24 | 2000-06-21 | 休斯电子公司 | Multi-modulation radio communication |
| EP1475917A1 (en) * | 2002-02-13 | 2004-11-10 | Mitsubishi Denki Kabushiki Kaisha | Communication system, receiver, transmitter, and communication method |
| CN101345728A (en) * | 2008-08-15 | 2009-01-14 | 苏州大学 | Multi-user encoding method for ultra-broad band communication signal |
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| CN102232319B (en) * | 2009-03-09 | 2013-08-14 | 华为技术有限公司 | Method and apparatus of a multiple-access communication system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1257356A (en) * | 1998-07-24 | 2000-06-21 | 休斯电子公司 | Multi-modulation radio communication |
| EP1475917A1 (en) * | 2002-02-13 | 2004-11-10 | Mitsubishi Denki Kabushiki Kaisha | Communication system, receiver, transmitter, and communication method |
| CN101345728A (en) * | 2008-08-15 | 2009-01-14 | 苏州大学 | Multi-user encoding method for ultra-broad band communication signal |
Non-Patent Citations (1)
| Title |
|---|
| LDPC-GMSK技术在DS-CDMA系统中的应用研究;董楠;《2005中国通信学会无线及移动通信委员会学术年会论文集 》;20050831;第403-407页 * |
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