CN104486035A - Superposition coding and orthogonal multiplexing combined downlink multiuser transmission method - Google Patents
Superposition coding and orthogonal multiplexing combined downlink multiuser transmission method Download PDFInfo
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Abstract
The invention discloses a superposition coding and orthogonal multiplexing combined downlink multiuser transmission method which comprises the following steps: S1, acquiring channel quality and requirement parameters of a plurality of users in a coverage range; S2, according to the channel quality and the requirement parameters of the plurality of users, carrying out grouping on the plurality of users to obtain a plurality of user groups, and determining a ratio of channel resources distributed to each user group; S3, according to the ratio of the channel resources distributed to each user group, carrying out symbolic level division on the physical layer channel resources on an orthogonal domain to obtain a plurality of symbolic level physical layer sub-channels; S4, according to the channel quality and the requirement parameters of users in each user group, in the symbolic level physical layer sub-channel corresponding to each user group, transmitting information of the users in each user group by adopting a superposition coding technology. Relative to the optimal SC (superposition coding) technology, the superposition coding and orthogonal multiplexing combined downlink multiuser transmission method has the advantage of greatly reducing implementation complexity of a terminal and time delay of the user information; relative to a conventional orthogonal multiplexing technology, the superposition coding and orthogonal multiplexing combined downlink multiuser transmission method has the advantage that the total system transmission rate is obviously promoted.
Description
Technical field
The present invention relates to digital information transmission technical field, particularly a kind of descending multi-user transmission method of combining supercomposed coding and orthogonal multiplex.
Background technology
In radio digital communication system, transmitting terminal needs to communicate with the multiple users in coverage, therefore, needs the downlink multi-access problem solving broadcast channel.
Generally, the channel quality of the multiple users in coverage there are differences.In order to maximize the transfer rate of system, it is optimum for adopting SC (Superposition Coding, supercomposed coding) technology to carry out descending multi-user transmission, but needs to consider all users after adopting SC technology, and therefore implementation complexity is the highest.In addition, in order to realize optimum transmission performance, receiving terminal needs to carry out SIC (Successive Interference Cancellation, serial interference elimination), SIC needs demodulating and decoding to go out the signal of ground floor, and then demodulating and decoding goes out the signal of the second layer, and the rest may be inferred.But SIC makes receiving terminal implementation complexity higher, and sharply rise with number of users increase complexity, meanwhile, adopt SIC can cause the problems such as receives information time delay.And consider the SC of all users, when user channel quality gap is less, SC technology promotes very little relative to the transfer rate of orthogonal multiplex technology, and the implementation complexity of SC technology is far away higher than orthogonal multiplex technology.
In traditional multi-user transmission scheme, orthogonal multiplex technology is widely adopted, traditional orthogonal multiplex technology comprises: TDM (Time Division Multiplexing, time division multiplexing), FDM (Frequency Division Multiplexing, frequency division multiplexing) and OFDM (Orthogonal Frequency Division Multiplexing, OFDM) etc.In essence, orthogonal multiplex technology carries out the method for quadrature divide at symbol level to physical layer channel resource.Be that each user distributes one section of time-domain resource for TDM, TDM, this time-domain resource is for transmitting the information of this user.Orthogonal multiplex technology realizes simple, flexible, but when the difference in channel quality of multiple user is larger, adopt the upper bound, the capacity territory gap of multi-user transmission when the upper bound, capacity territory of multi-user transmission during orthogonal multiplex technology and employing optimum SC technology comparatively large, namely loss of spectral efficiency is larger.
BDM (Bit Division Multiplexing, bitslicing is multiplexing) technology is a kind of specific implementation of Nonlinear Superposition coding techniques, is a kind of channel resource division multiplexing technology of the bit level across multiple symbol.When adopting the information of the multiple user of BDM technical transmission, channel resource is divided into the physical-layer sub-channel of multiple bit level on bit level, and the physical-layer sub-channel of each bit level is for transmitting the information of a user.Adopt the multi-user transmission scheme of BDM technology, scheduling of resource is very flexible, and can adopt any constellation mapping, and the more orthogonal multiplex technique of spectrum efficiency is higher.As a kind of specific implementation of optimum SC technology, also there are some problems of above-mentioned optimum SC technology in BDM technology.But BDM technology advantage suitably to reduce the transmission performance of multi-user, thus do not need to carry out SIC at receiving terminal, greatly reduce receiving terminal implementation complexity.But when adopting BDM technology, non-uniform error degree of protection Limited Number to multiple bit during actual constellation maps, therefore, when user in coverage is a lot of and exceed the number of non-uniform error degree of protection, will have the loss of performance boundary.
Summary of the invention
Object of the present invention is intended to solve one of above-mentioned technical problem at least to a certain extent.
For this reason, one object of the present invention is to propose a kind of descending multi-user transmission method of combining supercomposed coding and orthogonal multiplex, and the descending multi-user transmission method of this associating supercomposed coding and orthogonal multiplex can make up the defect that optimum supercomposed coding complicated technology realization degree is high, user profile reception delay is large.
For achieving the above object, one aspect of the present invention embodiment proposes a kind of descending multi-user transmission method of combining supercomposed coding and orthogonal multiplex, the descending multi-user transmission method of this associating supercomposed coding and orthogonal multiplex comprises: comprise the following steps: S1, obtains channel quality and the demand parameter of multiple user in coverage; S2, according to channel quality and the demand parameter of described multiple user, carries out grouping to described multiple user and obtains multiple user's group, and determines the ratio of the channel resource distributing to each described user's group; S3, according to the ratio of the channel resource of each described user's group, physical layer channel resource is carried out in orthogonal domain the segmentation that symbol layer is secondary, obtain the physical-layer sub-channel of multiple symbol level, wherein, the physical-layer sub-channel of each described symbol level is for transmitting the information of user's group; And S4, organize channel quality and the demand parameter of interior user according to each described user, organize each described user in the physical-layer sub-channel of corresponding described symbol level, adopt each described user of supercomposed coding technical transmission to organize the information of interior user.
The descending multi-user transmission method of the associating supercomposed coding that the embodiment of the present invention proposes and orthogonal multiplex, after the channel quality obtaining multiple user in coverage and demand parameter, according to channel quality and the demand parameter of multiple user, grouping is carried out to multiple user and obtains multiple user's group, and determine the ratio of the channel resource distributing to each user group, and then the ratio of the channel resource to organize according to each user, physical layer channel resource is carried out in orthogonal domain the segmentation that symbol layer is secondary, obtain the physical-layer sub-channel of multiple symbol level, last channel quality and the demand parameter organizing interior user according to each user, organize in the physical-layer sub-channel of corresponding symbol level each user, the each user of supercomposed coding technical transmission is adopted to organize the information of interior user.The descending multi-user transmission method of this associating supercomposed coding and orthogonal multiplex can reduce the optimum implementation complexity of supercomposed coding technology and the reception delay of user profile, and relative to traditional orthogonal multiplex technology, improves system aggregate transfer rate.
Further, in one embodiment of the invention, the demand parameter of described user comprises the transfer rate that user requires.
Further, in one embodiment of the invention, the described channel quality according to described multiple user and demand parameter, carry out grouping to described multiple user and obtain multiple user's group, and determine that the ratio of the channel resource distributing to each described user's group is specially:
According to channel quality and the demand parameter of described multiple user, grouping is carried out to described multiple user and obtains multiple user's group, determine the ratio of the channel resource distributing to each described user's group simultaneously; Or
According to channel quality and the demand parameter of described multiple user, first grouping is carried out to described multiple user and obtain multiple user's group, then determine the ratio of the channel resource distributing to each described user's group.
Further, in one embodiment of the invention, described segmentation physical layer channel resource being carried out in orthogonal domain symbol layer time, the physical-layer sub-channel obtaining multiple symbol level is specially: obtain N number of user's group when carrying out grouping to described multiple user, and the ratio determining the channel resource distributing to each described user's group is β
itime, be β by ratio
isymbol be attributed to the physical-layer sub-channel of a symbol level, wherein, 1≤i≤N, 0< β
i<1, β
1+ β
2+ ...+β
n=1, wherein, N be greater than 1 integer.
Further, in one embodiment of the invention, the ratio of the channel resource of each described user's group is the ratio that the symbol organizing signal for transmitting each described user accounts for total symbol.
Further, in one embodiment of the invention, described supercomposed coding technology is linear superposition coding techniques or Nonlinear Superposition coding techniques.
Further, in one embodiment of the invention, when described supercomposed coding technology is described linear superposition coding techniques, the information that each described user of described employing supercomposed coding technical transmission organizes interior user comprises the following steps: the information bit each described user being organized to interior each user carries out chnnel coding and Bit Interleave respectively, obtains the interleaving bits of each described user; The interleaving bits that each described user is organized interior each described user carries out constellation mapping respectively, obtains each described user and organizes symbol corresponding to interior each described user; The symbol that each described user organizes interior all users corresponding is superposed, obtains each described user and organize the first corresponding transmission symbol; And send the described first transmission symbol that each described user organizes correspondence.
Further, in one embodiment of the invention, according to following formula, the symbol that each described user organizes interior all users corresponding is superposed, obtains each described user and organize the first corresponding transmission symbol:
Wherein,
send symbol for described i-th user organizes corresponding first, i be greater than or equal to 1 integer, k
ifor the total number of users in described i-th user's group, k
ifor being more than or equal to the integer of 1,1≤j≤k
i,
for described i-th user organizes symbol corresponding to an interior jth user,
for the channel quality and demand parameter of organizing interior user according to described i-th user distribute to the power proportions of a jth symbol.
Further, in one embodiment of the invention, when described supercomposed coding technology is Nonlinear Superposition coding techniques, the information that each described user of described employing supercomposed coding technical transmission organizes interior user comprises the following steps: the information bit each described user being organized to interior each user carries out chnnel coding and Bit Interleave respectively, obtains the interleaving bits of each described user; According to predetermined bit allocative decision, the interleaving bits each described user being organized to interior all users carries out constellation mapping jointly to obtain the second transmission symbol that each described user organizes correspondence, wherein, described predetermined bit allocative decision organizes the channel quality of interior user according to each described user and demand parameter is determined, described predetermined bit allocative decision determines transmitting interleaving bits number and the position that each described user organizes interior each described user; And send the described second transmission symbol that each described user organizes correspondence.
The aspect that the present invention adds and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
The present invention above-mentioned and/or additional aspect and advantage will become obvious and easy understand from the following description of the accompanying drawings of embodiments, wherein:
Fig. 1 is the flow chart according to the associating supercomposed coding of the embodiment of the present invention and the descending multi-user transmission method of orthogonal multiplex;
Two two users that Fig. 2 (a) is the descending multi-user transmission method of combining supercomposed coding and orthogonal multiplex according to an embodiment of the invention match L=2m in algorithm time user grouping schematic diagram;
Two two users that Fig. 2 (b) is the descending multi-user transmission method of combining supercomposed coding and orthogonal multiplex in accordance with another embodiment of the present invention match L=2m+1 in algorithm time user grouping schematic diagram;
Three or three users that Fig. 3 (a) is the descending multi-user transmission method of combining supercomposed coding and orthogonal multiplex according to an embodiment of the invention match L=3m in algorithm time user grouping schematic diagram;
Three or three users that Fig. 3 (b) is the descending multi-user transmission method of combining supercomposed coding and orthogonal multiplex in accordance with another embodiment of the present invention match L=3m+1 in algorithm time user grouping schematic diagram;
The user grouping schematic diagram of Fig. 3 (c) for matching according to three or three users of the associating supercomposed coding of another embodiment of the present invention and the descending multi-user transmission method of orthogonal multiplex during L=3m+2 in algorithm;
Fig. 4 is the schematic diagram of the system aggregate transfer rate of different descending multi-user transmission method;
Fig. 5 is the flow chart of the descending multi-user transmission method of combining supercomposed coding and orthogonal multiplex according to an embodiment of the invention;
Fig. 6 is that two users of different descending multi-user transmission method combine the schematic diagram that can reach the upper bound curve in transfer rate territory; And
Fig. 7 is the schematic diagram according to the bit allocation scheme in the associating supercomposed coding of the present invention's specific embodiment and the descending multi-user transmission method of orthogonal multiplex when adopting BDM technical transmission user profile.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
Disclosing hereafter provides many different embodiments or example is used for realizing different structure of the present invention.Of the present invention open in order to simplify, hereinafter the parts of specific examples and setting are described.Certainly, they are only example, and object does not lie in restriction the present invention.In addition, the present invention can in different example repeat reference numerals and/or letter.This repetition is to simplify and clearly object, itself does not indicate the relation between discussed various embodiment and/or setting.In addition, the various specific technique that the invention provides and the example of material, but those of ordinary skill in the art can recognize the property of can be applicable to of other techniques and/or the use of other materials.In addition, fisrt feature described below second feature it " on " structure can comprise the embodiment that the first and second features are formed as directly contact, also can comprise other feature and be formed in embodiment between the first and second features, such first and second features may not be direct contacts.
In describing the invention, it should be noted that, unless otherwise prescribed and limit, term " installation ", " being connected ", " connection " should be interpreted broadly, such as, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be directly be connected, also indirectly can be connected by intermediary, for the ordinary skill in the art, the concrete meaning of above-mentioned term can be understood as the case may be.
The descending multi-user transmission method of associating supercomposed coding and the orthogonal multiplex proposed according to the embodiment of the present invention is described with reference to the accompanying drawings.
As shown in Figure 1, the associating supercomposed coding of the embodiment of the present invention and the descending multi-user transmission method of orthogonal multiplex comprise the following steps:
S1, obtains channel quality and the demand parameter of multiple user in coverage.
In one embodiment of the invention, the demand parameter of user can include but not limited to the transfer rate that user requires.
S2, according to channel quality and the demand parameter of multiple user, carries out grouping to multiple user and obtains multiple user's group, and determines the ratio of the channel resource distributing to each user group.
In one embodiment of the invention, according to channel quality and the demand parameter of multiple user, carry out grouping obtain multiple user's group to multiple user, and determine the ratio of the channel resource distributing to each user group, namely step S2 is specifically as follows:
S20, according to channel quality and the demand parameter of multiple user, carries out grouping to multiple user and obtains multiple user's group, determines the ratio of the channel resource distributing to each user group simultaneously.
In another embodiment of the present invention, according to channel quality and the demand parameter of multiple user, carry out grouping obtain multiple user's group to multiple user, and determine the ratio of the channel resource distributing to each user group, namely step S2 is specifically as follows:
S21, according to channel quality and the demand parameter of multiple user, first divides into groups to multiple user, obtains multiple user's group, then determines the ratio of the channel resource distributing to each user group.
Wherein, in step S20 and S21, distributing to the ratio of the channel resource of each user group, is obtain according to system transfers rate optimization computation.But in systems in practice, there is minimum value in the ratio distributing to the channel resource of each user group, and the ratio distributing to the channel resource of each user group possibly cannot be distributed according to optimal situation.
S3, according to the ratio of the channel resource that each user organizes, physical layer channel resource is carried out in orthogonal domain the segmentation that symbol layer is secondary, obtain the physical-layer sub-channel of multiple symbol level, wherein, the physical-layer sub-channel of each symbol level is for transmitting the information of user's group.
Wherein, in the baseband model of communication system, physical layer channel can be equivalent to a discrete symbols channel, and the input and output of this discrete symbols channel are equivalent to symbol, and therefore, channel resource represents with symbol stream in the present invention.In addition, in the present invention, from the symbolic equivalent of the diverse location in different orthogonal territory.In one embodiment of the invention, the ratio of the channel resource of each user group is the ratio that the symbol organizing signal for transmitting each user accounts for total symbol.
Particularly, in one embodiment of the invention, under the prerequisite of the channel quality and demand parameter that meet multiple user, the grouping situation (user organizes quantity) of multiple user and distribute to the ratio of channel resource of each user group, can be optimized according to the target that the aggregate transfer rate of multiple user is maximum.Particularly, in another embodiment of the present invention, when the channel quality of the user in coverage and demand parameter change, the ratio of the grouping algorithm of multiple user and the channel resource of distributing to each user group also can correspondingly adjust.
Particularly, in one embodiment of the invention, physical layer channel resource is carried out in orthogonal domain the segmentation that symbol layer is secondary, obtain the physical-layer sub-channel of multiple symbol level, be specifically as follows: obtain N number of user's group when carrying out grouping to multiple user, and the ratio determining the channel resource distributing to each user group is β
itime, be β by ratio
isymbol be attributed to the physical-layer sub-channel of a symbol level, wherein, 1≤i≤N, 0< β
i<1, β
1+ β
2+ ...+β
n=1, wherein, N be greater than 1 integer.
S4, organizes channel quality and the demand parameter of interior user according to each user, organize in the physical-layer sub-channel of corresponding symbol level each user, adopts each user of supercomposed coding technical transmission to organize the information of interior user.
Further, in one embodiment of the invention, supercomposed coding technology can be linear superposition coding techniques or Nonlinear Superposition coding techniques.Wherein, in one embodiment of the invention, when supercomposed coding technology is linear superposition coding techniques, the information adopting each user of supercomposed coding technical transmission to organize interior user can comprise the following steps:
S41, the information bit each user being organized to interior each user carries out chnnel coding and Bit Interleave respectively, obtains the interleaving bits of each user.
S42, the interleaving bits each user being organized interior each user carries out constellation mapping respectively, obtains each user and organizes symbol corresponding to interior each user.
S43, superposes the symbol that each user organizes interior all users corresponding, obtains each user and organizes the first corresponding transmission symbol.
Particularly, in one embodiment of the invention, can superpose the symbol that each user organizes interior all users corresponding according to following formula, obtain each user and organize the first corresponding transmission symbol:
Wherein,
be that i-th user organizes corresponding first and send symbol, i be greater than or equal to 1 integer, k
ibe the total number of users in i-th user's group, k
ifor being more than or equal to the integer of 1,1≤j≤k
i,
be that i-th user organizes symbol corresponding to an interior jth user,
for the channel quality and demand parameter of organizing interior user according to i-th user distribute to the power proportions of a jth symbol.
S44, sends each user and organizes the first corresponding transmission symbol.
In addition, in another embodiment of the present invention, when supercomposed coding technology is Nonlinear Superposition coding techniques, the information adopting each user of supercomposed coding technical transmission to organize interior user comprises the following steps:
S45, the information bit each user being organized to interior each user carries out chnnel coding and Bit Interleave respectively, obtains the interleaving bits of each user.
S46, according to predetermined bit allocative decision, the interleaving bits each user being organized to interior all users carries out constellation mapping jointly to obtain the second transmission symbol that each user organizes correspondence, wherein, predetermined bit allocative decision organizes the channel quality of interior user according to each user and demand parameter is determined, predetermined bit allocative decision determines transmitting interleaving bits number and the bit position that each user organizes interior each user.
Therefore, the combination of a transmission symbol or multiple transmission symbol, the interleaving bits being organized interior all users by the user that transmission symbol is corresponding is determined, a combination sending symbol or multiple transmission symbol is for transmitting the information of multiple user.
S47, sends each user and organizes the second corresponding transmission symbol.
In one particular embodiment of the present invention, suppose in the community in coverage, multiple user is evenly distributed between two concentric circless around base station, and two concentrically ringed radiuses are d respectively
minand d
max, therefore, intra-cell users is respectively to the probability distributing density function of base station distance d and distribution function:
Wherein, d
min<d<d
max.
Position and the signal to noise ratio of L user can be produced according to intra-cell users to the probability distributing density function (1) of base station distance d at random, the position of L user can be obtained d according to descending
1..., d
a..., d
l.The desired distance of L user to base station can be calculated according to following formula (3):
The expectation signal to noise ratio of L user can be calculated according to following formula (4).
SNR
a＝10*log(β(E(d
a))
-α) (4)
Wherein, α is path loss index, and β is the constant relevant to through-put power and antenna gain.
Suppose, the symbol Gaussian distributed of input subscriber channel, different user channel link is additive white Gaussian noise (AWGN, Additive White Gaussian Noise) channel, d
min=1, d
max=10, α=3, β=10
3, system works point is: the ratio of each user's transfer rate is the Shannon capacity ratio of each user, namely according to direct ratio criterion (DRP criterion): R
1: ... R
a: ...: R
l=C
1: ... C
a: ...: C
l, wherein C
a=log
2(1+P/N
a), P is the power of incoming symbol, N
afor the received noise power of user a.For optimum SC, in the incoming symbol of a signal, carry all user profile, in the power allocation scheme preset,
The most high transmission rates of user a is provided by lower formula:
Wherein, P is the power of incoming symbol, α
afor transmitting terminal is the power that user a distributes, α
jfor transmitting terminal is the power that user j distributes, need appropriate design to meet DRP criterion, snr
afor the signal to noise ratio of user a, snr
jfor the signal to noise ratio of user j, 1≤j≤L, 1 (x) is indicative function, as x>0,1 (x)=1, otherwise be 1 (x)=0.
Further, according to channel quality and the demand parameter of L user, first multiple user's group is grouped into L user, then determines the ratio of the channel resource distributing to each user group.Wherein, the algorithm divided into groups to L user can adopt following two kinds of grouping algorithms (two two users match algorithm and three or three users match algorithm):
1), L user is carried out descending according to signal to noise ratio size, when L can be expressed as 2m, as shown in Fig. 2 (a), L user can be divided into front and back two parts, and front and back two parts have m user respectively, in sequence, the user of sequence number to be the user of c (1≤c≤m) and sequence number be m+c is paired into one group, obtains m group user altogether.When L can be expressed as 2m+1, as shown in Fig. 2 (b), user can be divided into three parts, namely having sequence number in front and back two parts of m user and sequence is respectively the user that m+1 is corresponding, in sequence, the user of sequence number to be the user of c (1≤c≤m) and sequence number be m+c+1 is paired into one group, obtain m group user altogether, the user that in sequence, m+1 is corresponding is separately one group.
2) L user is carried out descending according to signal to noise ratio size, when L can be expressed as 3m, as shown in Fig. 3 (a), user can be divided into and there are three parts after in before m user, in sequence, sequence number is c (1≤c≤m), the user of m+c and 2m+c is paired into one group, obtains m group user altogether.When L can be expressed as 3m+1, as shown in Fig. 3 (b), user can be divided into four parts, namely after having respectively in before m user, in three sequences of partial sums, sequence number is the user that m+1 is corresponding, in sequence, sequence number is c (1≤c≤m), the user of m+c+1 and 2m+c+1 is paired into one group, obtain m group user altogether, in sequence, sequence number is that the user that m+1 is corresponding is separately one group.When L can be expressed as 3m+2, as shown in Fig. 3 (c), user can be divided into four parts, namely after having respectively in before m user, in three parts, sequence, sequence number is 1 and two users corresponding to m+2, in sequence, sequence number is c+1 (1≤c≤m), the user of m+c+2 and 2m+c+2 is paired into one group, obtain m group user altogether, in sequence sequence number be 1 and two users corresponding to m+1 be one group.
According to above grouping algorithm, then according to DRP criterion, the ratio of the channel resource distributing to each user group can be determined.According to above-mentioned parameter and strategy, obtain the schematic diagram of the system aggregate transfer rate of different descending multi-user transmission methods as shown in Figure 4, wherein, 4-1 be optimum SC technology when carrying out descending multi-user transmission system aggregate transfer rate with the change curve of intra-cell users number L, 4-2 be associating supercomposed coding and orthogonal multiplex descending multi-user transmission method adopt user match between two grouping to carry out descending multi-user transmission time, system aggregate transfer rate is with the change curve of intra-cell users number L, 4-3 be associating supercomposed coding and orthogonal multiplex descending multi-user transmission method adopt user three or three match grouping to carry out descending multi-user transmission time, system aggregate transfer rate is with the change curve of intra-cell users number L, 4-4 be TDM technology when carrying out descending multi-user transmission system aggregate transfer rate with the change curve of intra-cell users number L.As can see from Figure 4, descending multi-user transmission method and the TDM technical sophistication degree of combining supercomposed coding and orthogonal multiplex are similar, but the descending multi-user transmission method of associating supercomposed coding and orthogonal multiplex obviously promotes compared with the system aggregate transfer rate of TDM technology.In addition, as shown in Figure 4, the complexity of the more optimum SC technology of descending multi-user transmission method of associating supercomposed coding and orthogonal multiplex sharply reduces, and system aggregate transfer rate reduces less.
In one embodiment of the invention, combine supercomposed coding in the descending multi-user transmission method of associating supercomposed coding and orthogonal multiplex and be specifically as follows BDM (bitslicing is multiplexing), orthogonal multiplex is specifically as follows TDM (time division multiplexing), wherein, BDM is a kind of specific implementation of Nonlinear Superposition coding, TDM is a kind of special case of orthogonal multiplex, and namely different user signal only carries out multiplexing in the time domain.As shown in Figure 5, now, the descending multi-user transmission method of combining supercomposed coding and orthogonal multiplex comprises the following steps:
S51, obtains channel quality and the demand parameter of multiple user in coverage.
S52, according to channel quality and the demand parameter of multiple user, carries out grouping to multiple user and obtains multiple user's group, and determines the ratio of the time-domain resource distributing to each user group.
In one embodiment of the invention, according to channel quality and the demand parameter of multiple user, grouping is carried out to multiple user and obtains multiple user's group, and determine that the ratio of the time-domain resource distributing to each user group and step S52 are specifically as follows:
S520, according to channel quality and the demand parameter of multiple user, carries out grouping to multiple user and obtains multiple user's group, determines the ratio of the time-domain resource distributing to each user group simultaneously.
In another embodiment of the present invention, according to channel quality and the demand parameter of multiple user, multiple user's group is grouped into multiple user, and determines that the ratio of the time-domain resource distributing to each user group and step S52 are specifically as follows:
S521, according to channel quality and the demand parameter of multiple user, first carries out grouping to multiple user and obtains multiple user's group, then determines the ratio of the time-domain resource distributing to each user group.
Wherein, in step S520 and S521, distributing to the ratio of the time-domain resource of each user group, is obtain according to system transfers rate optimization computation.But in systems in practice, there is minimum value in the ratio distributing to the time-domain resource of each user group, and the ratio distributing to the time-domain resource of each user group possibly cannot be distributed according to optimal situation.
S53, according to the ratio of the time-domain resource that each user organizes, physical layer channel resource is carried out in time domain the segmentation that symbol layer is secondary, obtain the physical-layer sub-channel of multiple symbol level, wherein, the physical-layer sub-channel of each symbol level is for transmitting the information of user's group.
In one embodiment of the invention, the ratio of the time-domain resource of each user's group is the ratio accounting for total symbol for transmitting the symbol often organizing subscriber signal.It should be noted that, in embodiments of the present invention, symbol can come from multiple orthogonal intersection space, but just physical layer channel resource is carried out the segmentation of symbol level in time domain.Such as at MIMO (Multiple-InputMultiple-Output, multiple-input and multiple-output) in system, the symbol often organizing subscriber signal accounts for the ratio of total symbol further can for accounting for the ratio of total symbolic vector, and namely each symbolic vector comprises multiple symbol being sent to different antennae.
Particularly, in one embodiment of the invention, under the prerequisite of the channel quality and demand parameter that meet multiple user, the grouping situation (user organizes quantity) of multiple user and distribute to the ratio of time-domain resource of each user group, can be optimized according to the target that the aggregate transfer rate of multiple user is maximum.Particularly, in another embodiment of the present invention, when the channel quality of the user in coverage and demand parameter change, the ratio of the grouping algorithm of multiple user and the time-domain resource of distributing to each user group also can correspondingly adjust.
Particularly, in one embodiment of the invention, segmentation physical layer channel resource being carried out in time domain symbol layer secondary is specifically as follows with the physical-layer sub-channel obtaining multiple symbol level: obtain N number of user's group when carrying out grouping to multiple user, and the ratio determining the time-domain resource distributing to each user group is γ
itime, be γ by ratio
isymbol be attributed to the physical-layer sub-channel of a symbol level, wherein, 1≤i≤N, 0< γ
i<1, γ
1+ γ
2+ ...+γ
n=1, wherein, N be greater than 1 integer.
S54, organizes channel quality and the demand parameter of interior user according to each user, organize in the physical-layer sub-channel of corresponding symbol level each user, adopts each user of BDM technical transmission to organize the information of interior user.
Further, in one embodiment of the invention, when adopting each user of BDM technical transmission to organize the information of interior user, need first the physical-layer sub-channel of corresponding symbol level to be split on bit level, to obtain the physical-layer sub-channel of multiple bit level.Particularly, in one embodiment of the invention, for the physical-layer sub-channel of symbol level, can the sign resources of transmission be regarded as symbol dimension, multiple bits in each symbol are regarded as bit dimension, and then channel quality and the demand parameter of interior user is organized according to each user, by one or more symbol in the physical-layer sub-channel of symbol level corresponding for this group user integrally, carry out the segmentation of bit level, each partial bit after segmentation forms the physical-layer sub-channel of a bit level.Wherein, the physical-layer sub-channel of each bit level comprises one group of bit in symbol dimension and bit dimension.
Particularly, in one embodiment of the invention, by the physical-layer sub-channel of symbol level E (E be more than or equal to 1 integer) individual symbol integrally, carry out the segmentation of bit level.Suppose the information needing to transmit two users in the physical sub-channels of this symbol level, then need the physical-layer sub-channel physical-layer sub-channel of this symbol level being divided into two bit levels.Suppose a symbol comprise F (F be more than or equal to 1 integer) individual bit, then E symbol just comprises F*E bit.BDM technology is in F*E bit, channel quality and the demand parameter of interior user is organized according to each user, optimally select the information of a part of bit transfer user, the information of another user of other bit transfer, thus make the transfer rate of multiple user in this group, best under the prerequisite of the channel quality and demand parameter that meet multiple user.
Particularly, for BDM technology, the information bit that each user organizes interior each user carries out Bit Interleave after respective chnnel coding, obtains the coded-bit that each user organizes interior all users.Then each user is organized the coded-bit of interior all users, be mapped to the physical-layer sub-channel of bit level corresponding to user respectively.
Further, in one particular embodiment of the present invention, the bit allocation procedures of BDM technology is as follows: suppose that a certain user has two users in organizing, signal to noise ratio is respectively 15dB and 5dB, the bit of BDM technology is distributed in 8 symbols and carries out, i.e. E=8, each symbol all adopts the 256-Gray-QAM in DVB-T2 standard to modulate.According to the modulation system of the noise of two users when symbol, the upper bound curve 6-2 in the upper bound curve 6-1 that can obtain reached at the transfer rate territory of employing BDM technology as shown in Figure 6 and reached at the transfer rate territory adopting TDM technology, theoretical upper bound curve 6-3 also illustrates with as a reference in the drawings simultaneously.Now, system works point, namely actual bit allocation scheme, can determine according to DRP criterion, i.e. R
1: R
2=C
1: C
2=2.44:1, wherein,
(g=1 or 2) is the Shannon capacity of two users.As shown in Figure 7, the bit allocation scheme of actual two users can be as shown in Figure 7, wherein 64 bits carrying of 8 symbols, 16 bits (dash area bit) are had to distribute to the user that signal to noise ratio is 5dB, other 16 bits distribute to the user that signal to noise ratio is 15dB, thus approximate meet DRP criterion.
The descending multi-user transmission method of the associating supercomposed coding that the embodiment of the present invention proposes and orthogonal multiplex, after the channel quality obtaining multiple user in coverage and demand parameter, according to channel quality and the demand parameter of multiple user, multiple user's group is grouped into multiple user, and determine the ratio of the channel resource distributing to each user group, and then the ratio of the channel resource to organize according to each user, physical layer channel resource is carried out in orthogonal domain the secondary segmentation of symbol layer to obtain the physical-layer sub-channel of multiple symbol level, last channel quality and the demand parameter organizing interior user according to each user, organize in the physical-layer sub-channel of corresponding symbol level each user, the each user of supercomposed coding technical transmission is adopted to organize the information of interior user.The descending multi-user transmission method of this associating supercomposed coding and orthogonal multiplex is relative to optimum SC technology, cost is reduced to less system aggregate transfer rate, greatly reduce the implementation complexity of receiving terminal and the time delay of user profile, and relative to conventional orthogonal multiplex technique, system aggregate transfer rate has obvious lifting.
Describe and can be understood in flow chart or in this any process otherwise described or method, represent and comprise one or more for realizing the module of the code of the executable instruction of the step of specific logical function or process, fragment or part, and the scope of the preferred embodiment of the present invention comprises other realization, wherein can not according to order that is shown or that discuss, comprise according to involved function by the mode while of basic or by contrary order, carry out n-back test, this should understand by embodiments of the invention person of ordinary skill in the field.
In flow charts represent or in this logic otherwise described and/or step, such as, the sequencing list of the executable instruction for realizing logic function can be considered to, may be embodied in any computer-readable medium, for instruction execution system, device or equipment (as computer based system, comprise the system of processor or other can from instruction execution system, device or equipment instruction fetch and perform the system of instruction) use, or to use in conjunction with these instruction execution systems, device or equipment.With regard to this specification, " computer-readable medium " can be anyly can to comprise, store, communicate, propagate or transmission procedure for instruction execution system, device or equipment or the device that uses in conjunction with these instruction execution systems, device or equipment.The example more specifically (non-exhaustive list) of computer-readable medium comprises following: the electrical connection section (electronic installation) with one or more wiring, portable computer diskette box (magnetic device), random access memory (RAM), read-only memory (ROM), erasablely edit read-only memory (EPROM or flash memory), fiber device, and portable optic disk read-only memory (CDROM).In addition, computer-readable medium can be even paper or other suitable media that can print described program thereon, because can such as by carrying out optical scanner to paper or other media, then carry out editing, decipher or carry out process with other suitable methods if desired and electronically obtain described program, be then stored in computer storage.
Should be appreciated that each several part of the present invention can realize with hardware, software, firmware or their combination.In the above-described embodiment, multiple step or method can with to store in memory and the software performed by suitable instruction execution system or firmware realize.Such as, if realized with hardware, the same in another embodiment, can realize by any one in following technology well known in the art or their combination: the discrete logic with the logic gates for realizing logic function to data-signal, there is the application-specific integrated circuit (ASIC) of suitable combinational logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA) etc.
Those skilled in the art are appreciated that realizing all or part of step that above-described embodiment method carries is that the hardware that can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, this program perform time, step comprising embodiment of the method one or a combination set of.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing module, also can be that the independent physics of unit exists, also can be integrated in a module by two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.If described integrated module using the form of software function module realize and as independently production marketing or use time, also can be stored in a computer read/write memory medium.
The above-mentioned storage medium mentioned can be read-only memory, disk or CD etc.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is by claims and equivalency thereof.
Claims (9)
1. combine a descending multi-user transmission method for supercomposed coding and orthogonal multiplex, it is characterized in that, comprise the following steps:
S1, obtains channel quality and the demand parameter of multiple user in coverage;
S2, according to channel quality and the demand parameter of described multiple user, carries out grouping to described multiple user and obtains multiple user's group, and determines the ratio of the channel resource distributing to each described user's group;
S3, according to the ratio of the channel resource of each described user's group, physical layer channel resource is carried out in orthogonal domain the segmentation that symbol layer is secondary, obtain the physical-layer sub-channel of multiple symbol level, wherein, the physical-layer sub-channel of each described symbol level is for transmitting the information of user's group; And
S4, organizes channel quality and the demand parameter of interior user according to each described user, organize in the physical-layer sub-channel of corresponding described symbol level each described user, adopts each described user of supercomposed coding technical transmission to organize the information of interior user.
2. the descending multi-user transmission method of associating supercomposed coding as claimed in claim 1 and orthogonal multiplex, is characterized in that, the demand parameter of described user comprises the transfer rate of user's requirement.
3. the descending multi-user transmission method of associating supercomposed coding as claimed in claim 1 and orthogonal multiplex, it is characterized in that, the described channel quality according to described multiple user and demand parameter, grouping is carried out to described multiple user and obtains multiple user's group, and determine that the ratio of the channel resource distributing to each described user's group is specially:
According to channel quality and the demand parameter of described multiple user, grouping is carried out to described multiple user and obtains multiple user's group, determine the ratio of the channel resource distributing to each described user's group simultaneously; Or
According to channel quality and the demand parameter of described multiple user, first described multiple user is divided into groups, obtain multiple user's group, then determine the ratio of the channel resource distributing to each described user's group.
4. the descending multi-user transmission method of associating supercomposed coding as claimed in claim 1 and orthogonal multiplex, it is characterized in that, described segmentation physical layer channel resource being carried out in orthogonal domain symbol layer time, obtains the physical-layer sub-channel of multiple symbol level, is specially:
Obtain N number of user's group when carrying out grouping to described multiple user, and the ratio determining the channel resource distributing to each described user's group is β
itime, be β by ratio
isymbol be attributed to the physical-layer sub-channel of a symbol level, wherein, 1≤i≤N, 0 < β
i< 1, β
1+ β
2+ ...+β
n=1, wherein, N be greater than 1 integer.
5. the associating supercomposed coding according to any one of claim 3 or 4 and the descending multi-user transmission method of orthogonal multiplex, it is characterized in that, the ratio of the channel resource of each described user's group is the ratio that the symbol organizing signal for transmitting each described user accounts for total symbol.
6. the descending multi-user transmission method of associating supercomposed coding as claimed in claim 1 and orthogonal multiplex, it is characterized in that, described supercomposed coding technology is linear superposition coding techniques or Nonlinear Superposition coding techniques.
7. the descending multi-user transmission method of associating supercomposed coding as claimed in claim 6 and orthogonal multiplex, it is characterized in that, when described supercomposed coding technology is described linear superposition coding techniques, the information that each described user of described employing supercomposed coding technical transmission organizes interior user comprises the following steps:
The information bit each described user being organized to interior each user carries out chnnel coding and Bit Interleave respectively, obtains the interleaving bits of each described user;
The interleaving bits that each described user is organized interior each described user carries out constellation mapping respectively, obtains each described user and organizes symbol corresponding to interior each described user;
The symbol that each described user organizes interior all users corresponding is superposed, obtains each described user and organize the first corresponding transmission symbol; And
Send each described user and organize corresponding described first transmission symbol.
8. the descending multi-user transmission method of associating supercomposed coding as claimed in claim 7 and orthogonal multiplex, it is characterized in that, according to following formula, the symbol that each described user organizes interior all users corresponding is superposed, obtains each described user and organize the first corresponding transmission symbol:
Wherein,
send symbol for described i-th user organizes corresponding first, i be greater than or equal to 1 integer, k
ifor the total number of users in described i-th user's group, k
ifor being more than or equal to the integer of 1,1≤j≤k
i,
for described i-th user organizes symbol corresponding to an interior jth user,
for the channel quality and demand parameter of organizing interior user according to described i-th user distribute to the power proportions of a jth symbol.
9. the descending multi-user transmission method of associating supercomposed coding as claimed in claim 6 and orthogonal multiplex, it is characterized in that, when described supercomposed coding technology is Nonlinear Superposition coding techniques, the information that each described user of described employing supercomposed coding technical transmission organizes interior user comprises the following steps:
The information bit each described user being organized to interior each user carries out chnnel coding and Bit Interleave respectively, obtains the interleaving bits of each described user;
According to predetermined bit allocative decision, the interleaving bits each described user being organized to interior all users carries out constellation mapping jointly to obtain the second transmission symbol that each described user organizes correspondence, wherein, described predetermined bit allocative decision organizes the channel quality of interior user according to each described user and demand parameter is determined, described predetermined bit allocative decision determines transmitting interleaving bits number and the position that each described user organizes interior each described user; And
Send each described user and organize corresponding described second transmission symbol.
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