CN103368717A - Method and device for multiple access communication system - Google Patents
Method and device for multiple access communication system Download PDFInfo
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- CN103368717A CN103368717A CN2013103316406A CN201310331640A CN103368717A CN 103368717 A CN103368717 A CN 103368717A CN 2013103316406 A CN2013103316406 A CN 2013103316406A CN 201310331640 A CN201310331640 A CN 201310331640A CN 103368717 A CN103368717 A CN 103368717A
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Abstract
The invention discloses a method and device for a multiple access communication system which is used for being simultaneously communicated with a plurality of user entities. Signature sequences are used for identifying signals sent to different user entities and/or sent from different user entities. In the representation of a sample matrix, the signature sequences can be described as elements of columns of a signature sequence matrix, the signature sequence matrix is a low-density matrix, and distinguishing elements of finite sets of elements consist of nonzero elements of any single row of the matrix.
Description
Technical field
The present invention relates to the communication of a plurality of user subjects of multiple access to communication system.Be particularly related in identification, communication session or this type systematic between the signal by the signature sequence connection relevant with various user subjects.
Background technology
The information symbol spread spectrum is a kind of common methods that realizes frequency diversity by multipath frequency-selecting decline propagation channel.It also is to use shared communication channel that the method for simultaneously multiple access access is provided to a plurality of users (user subject).Have spread spectrum communication system based on the multiple access access function of user's specific spread spectrum code be commonly referred to code division multiple access (CDMA) system (spreading code also is commonly referred to spread spectrum signature or signature sequence, but hereinafter " signature sequence " as the generic term of this category code/sequence/signature).
The cross-correlation that the multiple access access function is based on lower between the signature sequence (perfect condition is zero).But multipath transmisstion can reduce the performance of cdma system, because the Multi reflection of each signature sequence element can cause the signature sequence distortion transmitted.The cross-correlation of the distortion signature sequence that receives will off-design minimum value.
OFDM (OFDM) transmission system can be simultaneously, and the multiple access access communications provides alternative transmission method.Ofdm system is that the transmission symbol of each piece uses the transmission Cyclic Prefix, makes multidiameter fading channel each quadrature detection subcarrier in receiver be shown as single footpath channel.So just can in single carrier system, use less complicated receiver.
Yet ofdm system can't directly utilize the potential diversity gain of multidiameter fading channel.Therefore developed a kind of system, be called MC-CDMA or spread spectrum OFDM system, on the one hand, this is the compromise of diversity gain and cdma system multiple access access function, on the other hand, is the trading off of simplicity of diversity gain and ofdm system receiver.In the method that these systems adopt, each information symbol (may obtain by error correction coding) multiply by user that the sequence by m spread symbol forms specifically sign (being commonly referred to chip).Afterwards, these information symbols are by m quadrature subcarrier transmission, and wherein the spread spectrum information symbol of every chip will be modulated one and specify subcarrier.Similar with ofdm system, will be the transmission information symbol transmission Cyclic Prefix of each piece.
Although the MC-CDMA system has the advantageous property of CDMA and OFDM, this type systematic has also been inherited one of them shortcoming of cdma system.That is, the access of the multiple access in time dispersive channel intersymbol interference.
In this type systematic, can be maximum a posteriori probability (MAP) detection method with symbol error probability minimized (receiver) detection method.Therefore yet for the actual user, the common too complex of this detection method has been developed Multiuser Detection (MUD) method of various suboptimums.But the MUD method of all these type of suboptimums all approaches optimum associating maximum probable (ML) in certain mode and detects.The MUD receiver is usually still very complicated, and this complexity is along with the increase of exponential manner ground is pressed in the increase of signature length.
On traditional approach, the MUD method has been independent of the signature design.Usually the unique aspect that affects MUD enforcement complexity is the quantity of signature.But the MUD complexity can be reduced by specially designed signature.
This type of trial comprises low-density spread spectrum (LDS) signature.The LDS signature of length m is the sequence of m spread symbol (chip), so w
cChip is not equal to zero, and m-w
cEqual zero, satisfy simultaneously w
c＜＜m.
In a prior art example, the set of n LDS signature can obtain from single common signature, comprises m-w
cW after individual zero
cIndividual continuous BPSK symbol.Remaining n-1 the signature that obtains is as the cyclic shift of common signature.
In case generate all cyclic shifts, the chip of all signatures all can be arranged (interlocking) in the same manner according to single common arrangement vector, thereby is placed on the diversity gain that improves in the set far away as far as possible on the fading channel by the nonzero element with each signature.The signals reverse that receives is arranged, and then uses the MAP detection method to make it balanced and carry out despreading.
Other prior art examples that the iteraction multiple users of signing based on LDS detects are as the basis take belief propagation (BP) algorithm.This MUD algorithm is intended to by the iteration the value of the confidence near the MAP detection algorithm, and the hypothesis signature sequence is the low density matrix that is called low-density checksum (LDPC) type.The complexity of belief propagation algorithm is well below the MAP detection algorithm, although the former still depends on the special signature sequence that is using, its performance can be near the performance of MAP detection algorithm.
Therefore, there is now the signature sequence matrix that forms by comprising many signature sequences of zero.The value of the nonzero element of prior art generates at random.(each row of LDS index matrix multiply by a unit envelope plural number with random user particular phases.）
Summary of the invention
Have a kind of needs in the communication system, therefore also method and apparatus has been proposed requirement, wherein signature sequence can be to generate than the more obvious mode of prior art, particularly for the overweight situation of load.
The target of preferential embodiment of the present invention is that a kind of multiple access to communication system and method for eliminating or reducing at least part prior art problem will be provided.
Simultaneously, the target of the embodiment of the invention be reduce at least in the prior art with the communication system transient state and the time varying load relevant problem.
There is a kind of technical solution to adopt the more simple mode of prior art of comparing, by the various possible element championship of restriction signature sequence matrix S, sets up the signature sequence with satisfied systematic function.
Other Characteristics and advantages of the present invention will be proved that from the detailed description of following preferential embodiment and additional patterns these embodiment and figure only provide by way of example, not consist of any type of restriction.
Description of drawings
Fig. 1 has disclosed and can use therein typical multiple access to communication system of the present invention.
Fig. 2 has disclosed the low-density signature sequence matrix example based on the multiple access system of OFDM.
Fig. 3 a-c has disclosed the execution example according to the one embodiment of the invention gained.
Fig. 4 a-c has disclosed the execution example according to the second embodiment of the invention gained.
The execution example according to the other embodiments of the invention gained that Fig. 5 discloses.
Embodiment
Generate signature sequence, directly solution is once to generate n user's designated phase by the search of computer trial-and-error method, produce the minimum information transmission error rates, perhaps adopt on-line mode to generate n user's designated phase, wherein, during each user's the transmission of data, reflector will generate a new stochastic signature sequence.This finishes with pseudo-random fashion usually, and receiver is known signature sequence at any time.
Yet, with the performance-relevant problem of using this type of low-density signature sequence and be intended to detect the system of BP detection method be, this type of at random or the signature sequence that uses trial-and-error method to generate can cause uncertain performance, the result is exactly that different users may experience different performances with special matrix structure according to the championship of signature sequence.
Under overload situations, signature sequence is more than chip.In the situation that does not have the quadrature signature set to exist, interference is intrinsic.
Under sample situation, each user may use the single signature collection that particularly distributes in the process of connecting, and is irrelevant with the transient state number of signatures of the current use of other users.
If in the generative process of low-density signature sequence, use structurized Deterministic Methods, will be very useful.In addition, when using the BP detection algorithm to detect and under overload situations, desirable state is to use Deterministic Methods to generate the system that a kind of performance is bound near alone family as far as possible.
Use the restriction (wherein the nonzero element of any single file has consisted of the difference element) of signature sequence matrix to increase the possibility that realizes the unisolvent code, that is, the message that receives can be decoded as single unique possible explanation, particularly for overload system.
In case system overload, that is, concurrent user's quantity surpasses the quantity of available signatures sequence, will apply other requirements to receiver terminal.In (overload) multiple access system, use number of signatures that the BP detection algorithm requires to use usually equal the to sign quantity of row of matrix S, that is, transmit all the time all signatures.But in many utility systems, user's quantity and user's data rate constantly change, if this is hinting the BP detection algorithm is used for this type systematic, then concurrent user/the data rate of every kind of possibility quantity all should have independent (that is, different) signature matrix.When this just requires the number change of the signature that uses in each system, will distribute new signature matrix and transmitted signal to all relevant user subjects.Obviously, the control signal in this type systematic can consume a large portion resource.
But signature sequence matrix used according to the invention can allow to use the signature sequence of any amount that matrix provides, that is, do not require and use all the time all sequences.That is to say that the application of the invention only relies on a signature matrix can support user and/or the data rate of variable number based on the LDS-CDMA system of SP detection algorithm.
As mentioned above, signature sequence comprises a plurality of symbols (chip).These signature sequence signals or coefficient preferably represent with matrix column, therefore can use so following relatively simple system to describe.For simplicity, therefore, signature sequence is described as the signature sequence matrix column in following explanation and claim.Certainly, signature sequence also can be described with various other modes, for example, and the row of matrix, or single column or row vector.But this type of variant can be rewritten as matrix, and reason is that it is to use in simple and clear mode in this article.Therefore these variants will be included in the definition of signature sequence matrix, be used for following explanation and claim.
In addition, the definition of famous set theory followed in term used herein " set ", that is, each element of set is unique, and do not have two identical elements in the set.Therefore, when being integrated in following explanation and the claim including (for example) W element for one, it follows above statement, that is, and and this set-inclusion W different element.
Fig. 1 has shown according to the present invention the simplification example architecture of the multiple access to communication system 100 of gained.Although be applicable to adopt the various multiple access to communication system of signature (spread spectrum) sequence, such as carrier wave communication system (for example, the WCDMA system), hereinafter, the present invention is described with reference to the system that adopts the OFDM structure.
As can be seen from the figure, mobile phone, smart mobile phone or the palmtop PC of many user subject 102-109(as having communication function) all utilize fixed wireless access node (such as wireless base station 101) to communicate.User subject 107 preferably comprises some communicators, comprises transmitter circuit 1071 or acceptor circuit 1072, does not get rid of and comprises simultaneously both.For processing, process or logical process such as signal, also comprised treatment circuit 1073 among the figure.If use mobile phone as wireless communication system (for example), then radiating circuit 1071 or receiving circuit 1072 should comprise radio circuit.For non-radio system (for example, optical system), the carrier frequency except radio frequency may be more interesting, therefore may comprise the circuit of corresponding frequencies.Radio access node is responsible for the processing (such as modulation and spread spectrum) of physical layer, and depends on special communication system, has indicated radio access node, for example, and base station, NodeB or eNodeB.Wireless base station 101 preferably comprises some communicators, comprises transmitter circuit 1011 or acceptor circuit 1012, does not get rid of and comprises simultaneously both.For processing, also comprised treatment circuit 1013 among the figure.If the use wireless base station, then radiating circuit 1011 or receiving circuit 1012 should comprise radio circuit.For non-radio system, the carrier frequency except radio frequency may be more interesting, therefore may comprise the circuit of corresponding frequencies.Generally speaking, communication network is comprised of a wireless access network (RAN) and a core net.But for simplicity, according to diagram, only disclose (part) wireless access network.To core net be described further.Although only disclosed a radio access node among the figure, multi-address communication system comprises many radio access nodes usually, thinks that user subject provides mobility.Usually, radio access node can be processed communication by the wave point in a certain coverage.
Communication between the user subject 102-109 and radio access node adopt signature sequence (spread spectrum node) in up link and/or down link, to distinguish the signal that sends to different user or send from different users.
Typical case as cdma system, no matter be that the base station is (such as base station 101, distribute signature sequence as explorer and to user's (user subject), for example setting up in the situation about connecting) or standardized flow process can guarantee that the user uses is unique signature sequence, need not clearly to communicate by letter in advance between base station and the user.
Although be applicable to carrier wave communication system, in following model embodiment, the signature sequence of gained is described with reference to ofdm system according to the present invention.In the OFDM type system, use signature sequence to allow the multidigit concurrent user can use subcarrier.
About the system of Fig. 1, communication system adopts signature sequence to distinguish the signal that different user sends usually, according to hereinafter defining a kind of signal model.If system comprises n signature, and each signature comprises m element (chip), then can define the matrix S (that is, dimension is the matrix of mxn) with the capable n row of m, and wherein n signature sequence of n row definition (transmits UE by subscriber equipment
l, l=0 ..., n-1)
In addition, if with a n signature name sequence x
l, l=0 ..., the information symbol that each among the n-1 is associated is arranged according to column vector form x, then comprises n received signal vector that receives chip value, after passing through additive white Gaussian noise (AWGN) channel, can be written as:
r=Sx+n (1)
Wherein, n represents the additive white Gaussian noise of plural number.If (by the fading channel transmission, each chip multiply by corresponding channel coefficients.）
If concurrent user's quantity u is equal to or less than the number of chips m of signature sequence, then can finds all the time the set of quadrature signature sequence, thereby lower inter-user interference (if use awgn channel, being zero in interference) is provided.
About overload system, on the other hand, that is, at u〉in the situation of m, signature sequence is more than chip, does not then have this moment the quadrature signature set to exist, and interference is intrinsic.
As mentioned above, this can make the detection ideal signal become more difficult, generally speaking, can propose other requirements to detection method.But these requirements can (at least to a certain extent can) by meticulous selection will with signature sequence relax.The complexity of detection method is preferably low as far as possible, and for example, the BP detection method can meet this type of relatively low complexity, and is applicable to any selection of signature sequence actual value.
The present invention relates to this type of selection of signature sequence, be particularly related to can be written as low-density (sparse) matrix signature sequence (namely, mainly by zero matrix of filling), the quantity of the nonzero element that especially wherein said matrix is gone arbitrarily is far smaller than the quantity of this row neutral element, and the quantity of the nonzero element of any row of wherein said matrix is far smaller than the neutral element quantity of these row.In addition, every row and every row have at least an element must comprise nonzero element.
Fig. 2 has disclosed the concept example based on the low-density signature sequence matrix of the system of OFDM.This means, not that signature sequence is used at whole channel spectrum (for example at WCDMA) symbol of unique user entity being carried out spread spectrum, will use which subcarrier but utilize radio access node that signature sequence is used for the modulation particular user entity in communication.According to the example that discloses, the filling in Fig. 2 matrix (non-blank-white) positional representation nonzero element.In addition, there are 24 signature sequences in the canonical matrix according to Fig. 2 discloses, and each can modulate 2 subcarriers, 24 subcarriers altogether, that is and, system's support is only used 12 subcarriers to transfer to simultaneously and is reached 24 user subjects.Certainly, may use the signature sequence that comprises other quantity nonzero elements, that is, a signature sequence may use single nonzero element, and other signature sequences then use three, four or more nonzero elements.
As mentioned above, use the performance of the system of this matroid to depend on to a great extent the particular value that the signature sequence nonzero element is set.
The low-density signature sequence of gained is the signature matrix with row of definite structure according to the present invention.The row of S be exactly after transmission equipment and the employed signature of receiving equipment.
According to the present invention, the signature matrix S adopts following structure: as mentioned above, S is low density type.For example, the building mode that S adopts can be that it only has the non-zero entity in the indicated position of low-density checksum oriental matrix.The design of this matrix meets the broad research of (channel coding theorem) under a diverse background of several years in the past.The quantity that is listed as among the S is the sum of available signatures sequence in residential quarter or the system, and the quantity of row is the therein quantity of the chip of spread spectrum of all transmission informations among the S.
According to the present invention, it has been recognized that and can distribute some to be worth to improve systematic function by the nonzero element to matrix S, the mode of employing is not have two identical nonzero elements on the single row, that is, all elements on the single row all is different.In addition, the value of the nonzero element of matrix S is the championship set C of limited plural number, element, that is, these values are to elect from the probable value of limited quantity.The example of this type of championship set will provide hereinafter.
As mentioned above, limiting the advantage of using matrix (wherein, the nonzero element of single file has consisted of the difference element arbitrarily) to have is: can improve the decodability attribute of system, especially for overload system.Simultaneously, compare prior art, the easier signature sequence of setting up is realized satisfied systematic function.
Can also limit foregoing, in order to further limit the selection of the nonzero value of S, because not only the nonzero element of the every row among the S must be different, but also must select signature championship set C, thereby make its scale equal the maximum quantity of the nonzero element that in the single file of S, shows
For unique decodability, this can verify according to following methods:
Unisolvent code by row: for the different vectors of modulation intelligence symbol, the sum of the nonzero element in every row of S all is different (wherein each non-zero row element utilizes any information symbol in the q information symbol championship to modulate).(all vectorial Sx are different in each element.）
If satisfy this condition, then for the different vectors of modulation intelligence symbol, the sum of all row of S (using any information symbol in the q information symbol championship to modulate) all is different.If (all vectorial Sx are different, and then the vector in each element is also different.) in other words, if S has the unisolvent code by row, then S also will have the unisolvent code.
Suppose to satisfy above-mentioned condition, then for the different vectors of modulation intelligence symbol, the sum of every row nonzero element of any amount is different (wherein, every row nonzero element uses any information symbol in the q information symbol championship to modulate) all.This is so that for the different vectors of modulation intelligence symbol, the sum of any line number of S (using any information symbol in the q information symbol championship to modulate) is different, thereby make S all have the unisolvent code for the active user of any amount, but so it can be used for expanding system.
The unisolvent code of signature sequence matrix S can be tested by the search that might make up to the transmission of data in the vector.
The signature sequence championship that satisfies one or more above-mentioned conditions hereinafter will be described.
Satisfying the colleague of above-mentioned lower limit, the size of signature championship set is preferably as far as possible little.That is, the size of signature championship set C equals the maximum quantity of the nonzero element that can show at least in the row of S.
A kind of method that defines the element of described element set C is, this element can be described with the value of mathematic(al) representation, and this expression formula is made of one-period or essence periodic function.
For example, this can satisfy by the signature championship set C that is comprised of (part) PSK-championship, according to:
Wherein, W is the number of elements of signature championship set C, for example, and the maximum quantity of the nonzero element that in certain delegation of S, occurs.
If S consists of with these characteristics, then compare the arbitrarily signature sequence of (trial-and-error method) prior art, can obtain better performance.As mentioned below, this is especially true for overload system, that is, when in described signature sequence matrix, the quantity of row is far longer than capable quantity.
For the situation of overload, systematic function is usually to measure (will there be inter-user interference in the performance of therefore only using a user's system) with the gap of alone family scope.According to the selection of signature sequence set, this gap may less or larger (even for MAP detection method).
Under muting condition, use MAP and BP detection algorithm all should detect clearly the information symbol that can modulate Different L DS signature.If the signature of modulation represents the code of unisolvent code, then this is also possible.
If the P in the equation (2) selects enough greatly, then sequence probably has the unisolvent code.On the other hand, preferably the value of P is as far as possible little, because naming a person for a particular job of championship of signature launched in unit circle, this will be conducive to select in addition the minimum range feature of signal transmission.Therefore, the nonzero element of matrix S can fully advantageously comprise the unimodular secondary element, or comprises at least in fact the unimodular secondary element.From power control point angle, use the element with identical or the identical modulus of essence very favourable.This means that in the present embodiment the selection of nonzero value will be limited to relatively limited signature championship.
For example, can electing as of (2) middle P:
P=q
W (3)
P=q·W (4)
Wherein, q is the maximum information championship size that described active user uses, namely, the quantity of the symbolic that the specific modulation mode of using provides, for example, in BPSK, be 2, be 4 etc. (this information championship can (for example) be any one in following group: M-PSK, M-QAM) in APSK.In addition, min (q, W) is the minimum number of q and W, and gcd (q, W) is the greatest common divisor of q and W.
In many Practical Communication Systems, user's quantity is variable, that is, system can expand.For example, in the up link of mobile communication system, a plurality of users are simultaneously to same base station transmitted signal.Although the quantity of the signal that receives simultaneously is variable, can determine at base station receiver all the time.In addition, in the synchronizing moving system, such as LTE, synchronism allows to use BP to detect.
The signature sequence of gained allows any amount row of S are used as signature sequence according to the present invention,, does not require that all signature sequences use all the time simultaneously that is.Also have like this a benefit to be exactly, only need to be when described user subject and communication system connect distribution once signed sequence, sustained period that just can this connection keeps always.
As mentioned above, use BP to detect and have a lot of benefits, but and practical for BP is detected in the spread communication system that uses the LDS signature sequence, must guarantee that this signature sequence has unisolvent code (referring to above) in the system of arbitrary extension.Secondly, the belief propagation receiver must the back-up system extensibility.Prior art does not provide any solution for this two large problems.But the present invention has accomplished!
Select the structure of the S of above-mentioned P value to pass through simulating, verifying, confirm for a large amount of LDPC oriental matrixs, usually to have the unisolvent code
In other embodiments, described signature sequence matrix S further is restricted, thereby makes any single-row nonzero element of described matrix S also consist of the difference element of described element finite aggregate C.
In Fig. 3 a-c, 4a-c and Fig. 5, signature sequence (3) and (4) have been provided and at all users simulation result in the situation of the transmission of data all the time.Performance proposes for the possibility of all u user's average symbol mistake in the system.
Fig. 3 a-c has shown 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) is better than optional signature sequence in the prior art, near the tenth of the point shellfish with interior alone family scope.
Fig. 4 a-c has shown three kinds of QPSK situations with 150% load, and wherein the size of signature sequence is respectively 10x15,14x21 and 16x24.The performance of signature sequence design (4) surpasses optional signature sequence in the prior art, and many decibels all have higher SNR.
Can find out that from the QPSK simulation result clearly, compare with alone family performance, the multi-user will meet with performance loss.This causes each user's data throughout to reduce.On the other hand, will increase by 50% user in the system, and therefore cell throughout, the summation of all throughputs also will increase.
Fig. 5 has shown the performance of (10, the 15) system with QPSK modulation, specially for 15 situations of only having 10 instantaneous uses of code in may code, i.e. and the expanding system performance of QPSK, 150% load (10,15) system, momentary load is 100%.In emulation, there are 5 (selecting at random) signature sequences not used by any user.This example has been enumerated the advantage of signature sequence according to the situation that the present invention is directed to scaling system.
Although the present invention is relevant with wherein specific embodiment or characteristic, it still can be revised.This standard is intended to contain any variant of the present invention, use, employing or implementation method; Do not get rid of device and the equipment of enabling software, by the processing feature of different order or the non-key or mutually non-proprietary combination of embodiment; In the scope of following subsequently claim, generally speaking, professional and technical personnel of the present invention grasps operation principle of the present invention.
As non-proprietary example, although the present invention has disclosed and above-mentioned spread spectrum OFDM System Dependent, the present invention is equally applicable to distinguish with signature sequence any system of user.
Claims (19)
1. multiple access to communication system, described communication system is used for communicating by letter simultaneously with a plurality of user subjects, described communication system is identified to the signal of different user entity transmission and/or the signal that sends from different user subjects with signature sequence, wherein said user subject, in the time of in being in described simultaneously communication, each user subject is assigned the specific signature sequence of at least one user subject, wherein said signature sequence can be described as the column element of signature sequence matrix S, described signature sequence matrix S is low density matrix, and this communication system has following characteristics:
Described signature sequence matrix S is a kind of like this matrix, and the nonzero element of any single file of wherein said matrix S has consisted of the difference element of element finite aggregate C.
2. the system of gained according to claim 1, the described element of its described element set C is the element that can describe with the value of mathematic(al) representation, this expression formula is made of one-period or essence periodic function.
3. the system of any one gained according to claim 1-2 is characterized in that each element of described element set comprises a unit modulus complex value.
4. the system of gained according to claim 1, the quantity of signature sequence is determined by the described signature sequence matrix S that surpasses each described signature sequence number of elements.
5. the system of gained according to claim 1, the number of elements W of described element finite aggregate C equal the maximum quantity of the nonzero element in the single file of described signature sequence matrix S.
6. the system of gained according to claim 1, the value of the element of described element finite aggregate C depends on the symbol championship of the modulation system of using in the transmission.
7. the system of gained according to claim 1, wherein, the limited championship C of described element is defined as
8. the system of gained according to claim 7, wherein P equals with one in next group equation: P=q
W, P=qW,
Wherein, q is the maximum symbol quantity of the symbol championship of the modulation system used, and wherein min (q, W) is the minimum number of q and W, and gcd (q, W) is the greatest common divisor of q and W.
9. the system of gained according to claim 1, the nonzero value that it is characterized in that described signature sequence matrix S is Sx
1-Sx
2Vector, comprise the simultaneously different vector x of transmitting subscriber identify symbol
1And x
2Any right nonzero element.
10. the system of gained according to claim 1, the nonzero value of described signature sequence matrix S is, for the different vector x of while transmitting subscriber identify symbol
1And x
2Right arbitrarily, vectorial Sx
1Be different from vectorial Sx
2Value.
Comprise the symbol in any modulation system of following group 11. it is characterized in that according to claim 1, the system of 6,9,10 gained, the user profile symbol of described system transmissions: M-PSK, M-QAM.
12. the system of gained according to claim 1, the instantaneous quantity u of described user subject changes often so that sometimes u less than the quantity n of the row in the described signature sequence matrix.
13. the system of gained according to claim 1, described signature sequence matrix S is a kind of like this matrix, and any single-row nonzero element of wherein said matrix S has consisted of the difference element of described element finite aggregate C.
14. the system of gained according to claim 1 is characterized in that each chip of signature sequence can modulate the subcarrier of ofdm signal.
15. the transmission method in multiple access to communication system, described communication system are used for communicating by letter simultaneously with a plurality of user subjects, the method comprises:
-to identify to the signal of different user entity transmission and/or the signal that sends from different user subjects with signature sequence, wherein said signature sequence can be described as the element of the row of signature sequence matrix S, and described signature sequence matrix S is low density matrix, and
-to distributing the signature sequence of the specific described signature sequence matrix S of at least one user subject with the user subject that described communication system is communicated by letter simultaneously, described signature sequence matrix S is a kind of like this matrix, and the nonzero element of any single file of wherein said matrix S has consisted of the difference element of element finite aggregate C.
16. the transmission method of gained according to claim 15, wherein signature sequence only when described user subject and communication system connect distribution once and keep at the sustained period of this connection always.
17. a kind of device of multiple access to communication system, described communication system is used for communicating by letter simultaneously with a plurality of user subjects, described communication system is identified to the signal of different user entity transmission and/or the signal that sends from different user subjects with signature sequence, wherein said user subject, in the time of in being in described simultaneously communication, each user subject is assigned the specific signature sequence of at least one user subject, wherein said signature sequence can be described as signature sequence matrix column element, described signature sequence matrix S is low density matrix, and this device has following characteristics:
Described signature sequence matrix S is a kind of like this matrix, and the nonzero element of any single file of wherein said matrix S has consisted of the difference element of element finite aggregate, and
The discernible signal that telecommunication circuit is corresponding with the signature sequence of application according to the signature sequence Transfer-matrix.
18. the device of gained according to claim 17, wherein, telecommunication circuit comprises the carrier frequency circuit.
19. the device of gained comprises for definite one or more treatment circuits of transmitting or receiving signal corresponding with the signature sequence of signature sequence matrix according to claim 17.
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| WO2016101108A1 (en) * | 2014-12-22 | 2016-06-30 | 华为技术有限公司 | Method and device for transmitting indication information |
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| CN111670549A (en) * | 2018-02-01 | 2020-09-15 | 高通股份有限公司 | Forward-compatible design for non-orthogonal UE signature sequences |
| CN111670549B (en) * | 2018-02-01 | 2022-01-21 | 高通股份有限公司 | Method and apparatus for wireless communication |
| WO2020001274A1 (en) * | 2018-06-29 | 2020-01-02 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for multiple access transmission |
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