CN1463110A - Multiplexing method of combination of non-orthogonal partition and time division partition - Google Patents
Multiplexing method of combination of non-orthogonal partition and time division partition Download PDFInfo
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- CN1463110A CN1463110A CN 03137566 CN03137566A CN1463110A CN 1463110 A CN1463110 A CN 1463110A CN 03137566 CN03137566 CN 03137566 CN 03137566 A CN03137566 A CN 03137566A CN 1463110 A CN1463110 A CN 1463110A
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Abstract
The method is suitable to the sending end of down channel in wireless cellular communication. Under hardware support, within same time slot, non-orthogonal multiplexing of transmitting two groups of independent information at same time is realized between two users with large difference in S/N ratio by using the constellation overlapping method of non-orthogonal code division. That is the information of a bad user determines a cluster of constellation points in nebula, and the information of a good user determines a point in nebula. The information between above two users within same slot and other users in different time slot or in different group is time-division multiplexing. The invention raises system throughput as well as lowers the complexity for realizing multi-user non-orthogonal system.
Description
Technical field
Cut apart the multiplexing method that combines with the time-division belong to the descending division multiplexing technical field of radio honeycomb communication nonopiate cutting apart
Background technology
Along with the increase of multimedia service demand, obtain the high-throughput of wireless cellular system, become one of research focus of the communications field.In traditional radio honeycomb communication, adopt multiplexing method that quadrature cuts apart to avoid interference between the user to the adverse effect of throughput of system, be implemented in the multi-user communication under certain throughput.
The mode that quadrature is cut apart comprises time division multiplexing, the code division multiplexing of frequency division multiplexing and quadrature, the main feature of time division multiplexing (Time-DivisionMultiplexing) is to utilize different time-gap to transmit each road unlike signal, every road sign indicating number is non-overlapping copies in time, stacks togather but each road signal is mixed on frequency domain.Frequency division multiplexing is that each road signal segmentation comes on frequency domain, stacks togather but mix on time domain.Code division multiple access (CDMA) digital communication technology is a channel of setting up quadrature by the code sequence of uniqueness, and each user profile also is not disturb mutually.But the multiplexing method that this quadrature is cut apart can only transmit an information sequence in some resource units, and the throughput of whole system has been subjected to very big restriction.
The present invention has solved the conventional orthogonal dividing method in the restriction aspect the throughput of system by adopt the nonopiate multiplexing method of cutting apart in wireless cellular system.[the list of references: Andrea Goldsmith that studies confirm that to down channel broadcast channel capacity, Capacity of broadcast fading channels with variable rate and power Global TelecommunicationsConference, 1996.GLOBECOM ' 96. ' Communications:The Key to Global Prosperity, 1996Page (s): 92-96] feasibility of this method, promptly under equal channel condition, under the non-orthogonal partitioning scheme, the information of different user is interlaced, cuts apart than quadrature to access bigger throughput of system.
But still there are two problems in nonopiate division multiplexing method when being applied in the wireless cellular system.The first, be non-orthogonal between the signal of different user in non-orthogonal cutting apart, superposed part is just arranged each other.In order in down channel, to use this partitioning scheme, and realize the multiplexing of information between the different user, will guarantee that at first each user can obtain that a part of information of oneself accurately at receiving terminal.The present invention utilizes the difference of the quality of reception between the user, by the constellation (seeing accompanying drawing 1) of design crossover, has realized this target, and promptly different user is to the transmission of each self information.
Second problem is, in cellular communication, each sub-district has only a base station, just has only a down channel, this channel need transmit users all in the sub-district (general more than two s') information simultaneously so, and this is a quite complicated process.Especially cut apart non-orthogonal, the information between the user has mutual coincidence, though the constellation crossover can each user can both correctly obtain required information, when user's number greater than 2 the time, the realization of this system will be very complicated.The complexity that the present invention realizes for the reduction system, employing be nonopiate and the multiplexing method that combines of time-division.This method had both improved throughput of system, had avoided complicated system design again.
The method of the present invention by adopting constellation crossover technology and combine with time division multiplexing in nonopiate cutting apart under the lower prerequisite of the system of assurance implementation complexity, improved the throughput of wireless cellular system.
Summary of the invention
The invention provides a kind of new multiplexing method, the multiplexing method that the nonopiate and time-division combines, purpose is under the prerequisite that does not increase bandwidth and power, realizes the forward-link capacity of the wireless cellular system bigger than existing multiplexing method.Suppose that the base station knows the quality of reception of each user in the sub-district, just received signal to noise ratio.At first the user in the sub-district is divided into two classes (good user, difference user) according to the height of signal to noise ratio.Grouping then all comprises a good user and several difference users in each group.The user profile that in one group, two qualities of reception is had certain gap then with non-orthogonal code division multiplexing together, then OTDM is together between the information after multiplexing then.
The constellation crossover is then realized two nonopiate multiplexing technology of user in this scheme, and it is a kind of technology of multiresolution, and Fig. 1 has provided the example of a constellation crossover.Information 1,2nd among the figure, separate information.Through ovennodulation, decide the modulation signal of final transmission to be arranged in which bunch constellation point (point that Fig. 1 dotted line is enclosed is known as and is in same nebula) by information 1.Information 2 is then selected the point of final emission in this nebula.Because the different relation of noise, constellation has dispersing in various degree, quality of reception difference subscriber signal intensity is little, it seems that relatively noise ratio is bigger, therefore disperse and want serious, do not seen the constellation of information 2, but can differentiate the constellation of information 1, so the poor user of these qualities of reception can receive modulated information 1.For the quality of reception good (signal to noise ratio height) user, relative noise is smaller, receiving constellation disperses low weight, which bunch not only can differentiate after the modulation is, to bunch in point also can differentiate, therefore it can tell the information that signal transmitted 1 (to the user profile demodulation of difference) of current reception earlier, and then demodulates information (to the demodulation of this user profile).If information 1 is the information that we will send poor user to, and information 2 is the needed information of the good user of the quality of reception, such two users can both receive information separately by the practical capacity of oneself, thereby have avoided timesharing or frequency division transmission.
The invention is characterized in: at the transmitting terminal of radio honeycomb communication system down channel, under hardware supports, in same time slot, the constellation crossover method of utilizing non-orthogonal codes to divide between the very big user of two signal to noise ratio difference realizes in order to transmit the nonopiate multiplexing of two groups of independent information simultaneously, cluster constellation point in i.e. poor user's the information decision nebula, and the nebula point in good user's the information decision nebula; But the information between above-mentioned two users other users in different time slots or in the different group in the same time slot is time-multiplexed.Described group is promptly divided into groups, in each grouping, the shared time slot of each difference user is identical, and a good user then is that each time slot is public, thereby exist the user that two signal to noise ratios differ greatly in each impartial time slot of having realized dividing into groups, and the shared time slot of each grouping equates.
Described method contains following steps successively:
(1) the size ordering of all users in the sub-district according to known average received signal to noise ratio, select (1/ (N+1)) the individual user of signal to noise ratio maximum, these users have been called the user, remaining user becomes poor user, good user is an Integer N with difference user's number ratio, promptly 1: N;
(2) these user grouping, in 1: the ratio grouping of N, at first form one group since a highest good user and N the highest poor user of signal to noise ratio of signal to noise ratio; Remaining user handles like this, all is assigned with up to all users;
(3) the identical time slot of assigning to each difference user is divided into N time period to grouping, has 1 poor user and 1 good user's information to adopt the nonopiate multiplexing of constellation crossover formula, each signaling point (x of good user in each time period
1) all be superimposed on respectively poor user each signaling point (x
2) on, the signal x after the multiple connection
12=x
1+ x
2
(4) between different group and the group, between each time slot in the grouping, adopt the quadrature time division way.
Correctly grasp at transmitting terminal under the prerequisite of channel condition, such multiplexing method has effectively utilized the difference of signal to noise ratio between the user, realized the emission in same channel of a plurality of user profile, obtained than the bigger throughput of system of existing orthogonal multiplex method.
Description of drawings
Fig. 1 constellation crossover planisphere, a. represents the poor user's that signal to noise ratio is lower signal (x among the figure
2) mapped constellation figure, b. represents the good user's that signal to noise ratio is higher signal (x
1) mapped constellation figure, c. then represents two users' signal multiplexing signal x=x afterwards
1+ x
2Mapped constellation figure
Fig. 2 from the time assign to and cut apart the multiplexing schematic diagram that combines nonopiate cutting apart with the time-division
Splitting scheme schematic diagram between a plurality of groups of Fig. 3
Fig. 4 multiplexing method program flow chart
Embodiment
The nonopiate multiplexing method of cutting apart combination with the time-division of cutting apart has utilized the difference of received signal to noise ratio between the different user, effectively raises throughput of system.The down channel that is particularly useful for radio honeycomb communication, because in the cellular system, the user of same sub-district is owing to different with the distance of base station, and the influence of landform, signal to noise ratio has very big difference.Suppose known each user's received signal to noise ratio, realize that in a sub-district the concrete implementation step of this multiplexing method is as follows, flow chart is then seen accompanying drawing 4.
With all users in the sub-district according to the quality of reception (height of average signal-to-noise ratio just) be divided into good with differ from two classes, two class users' number ratio is N. (N is an integer).These reception information that are in the user in the same sub-district are all sent by same base station, and these information will be through same Channel Transmission.Specifically, with the size ordering of all users, select (1/ (N+1)) the individual user of signal to noise ratio maximum then according to the average received signal to noise ratio, we have become the user with this part user, remaining user becomes poor user, and like this, good user is 1 with the ratio of difference number of users: N
2. these users are divided into group.At first from the highest good user of signal to noise ratio, from the difference user, find out the highest N of signal to noise ratio and this good user and form one group.It is the highest to find out signal to noise ratio then in remaining user, with one group of signal to noise ratio is the highest among the remaining difference user composition.So go down, be assigned with until all users.
3. in our method, the time of this group is divided into N time period, each time period size is τ, and each time inner segment has 1 poor user and 1 good user's information to adopt non-orthogonal multiplexing (constellation crossover), each signaling point (x of good user
1) all be superimposed on respectively poor user each signaling point (x
2) on.Signal x after the multiple connection
12=x
1+ x
2[list of references: Alexander Seeger, Broadcast Communication on fading channel using hierarchical codedmodulation, Global Telecommunications Conference, 2000.GLOBECOM ' 00.IEEE, Volume:1,2000 Page (s): 92-97 vol.1] in fact be exactly to be positioned at which nebula (seeing accompanying drawing 1), x by ropy user's information decision signal wherein
1Be exactly the center of this nebula, and the information x of another one
2Then in this nebula, select a constellation point.
4. be independently between each time period in each group.Each difference user time period that will to take a size be τ in the group like this, and good user's information in whole N τ all in transmission, as shown in Figure 2.How multiplexing the user that Fig. 2 has described a packets inner is, and has done a comparison with traditional time-multiplexed method.The arrow left side represents that the method for cutting apart with the time-division transmits the information of different user among Fig. 2, and each square is represented a time slot, can see that each user takies a time slot separately.Arrow the right has then been described us and has been adopted cut apart the multiplexing method that combines nonopiate cutting apart with the time-division, has described 3 time slots here altogether, and wherein the user 2,3,4 respectively the 1st, 2, transmit information separately in 3 time slots, and user 1 information is all arranged in each time slot; And user 1 information in each time slot with this time slot in another one user adopt the nonopiate method of cutting apart to take to be in the same place.
5. between different groups and the group, still adopt the mode of quadrature time-division.Consider fairness, every group obtains identical resource, just same time slot.
Can see that this multiplexing method had both utilized the signal to noise ratio difference between the different user, realize nonopiate multiplexing between two users, improve throughput of system.Simultaneously, in group and group and group, adopt the time division multiplexing of quadrature between the different time-gap, avoided realizing the complexity of a plurality of user's non-orthogonal systems.Flow chart as shown in Figure 4.
To illustrate below, how such multiplexing method is realized:
The emission of down channel has a plurality of users' informational needs to send, and suppose to have in this sub-district 6 users (being called user 1,2,3,4,5,6 respectively), and these users' signal to noise ratio is respectively 2dB, 3dB, 5dB, 5dB, 14dB, 15dB.Described in the previous methods description, according to the height of received signal to noise ratio, intrasystem user is divided into two classes, good user and difference user, and the ratio of number is 1: 2.So good user be exactly signal to noise ratio be 14dB, the user of 15dB (user 5, and the user 6), remaining user then be the difference user.After dividing into groups according to step 2, the user 1, and user 2 and user 5 are divided into one group, and user 3, user 4 and user 6 form second group, and each group will obtain the delivery time of system 1/2, system time is divided into time slot, and the information of each group takies a time slot at every turn, alternately transmits.
Specifically describing below, how second group user profile sends:
1) each user's information is at first passed through error correction coding and (is adopted Turbo code, be Parallel Concatenated Convolutional Code), user 3 and user's 4 information is done the modulation of QPSK (quaternary phase shift keying) then, and user 6 information is then done the modulation of 16QAM (16 ary quadrature Modulation and Amplitude Modulation)
2) time slot that this group is taken is further divided into two parts that size is identical, and the time slot of one of them part transmits user 3 and user's 6 information, and another part then will transmit user 4 and user's 6 information.The information that is to say user 3 and user 4 only transmits in the time of some parts, and user 6 will organize in the shared time slot at this and can both transmit information.
3) establish user 3 and after ovennodulation, obtain signal x
3, allow signal x after the modulation of good user (user 6) in this modulation signal and this group
6Realize nonopiate multiple connection by the constellation crossover, promptly each signaling point of good user all be superimposed on respectively poor user each signaling point on.Signal x after the multiple connection
3,6=x
3+ x
6
4) same user's 4 information x
4Also carry out superposition, obtain x with user 6 information
4,6
5) the signal x through obtaining behind the constellation crossover
3,6, x
4,6Time division multiplexing promptly alternately transmits in the different periods.
The transmission of all user profile during we have just realized second group like this.Same, in the another one time slot, other one group information also with this category like transmit.In same channel, realized the transmission of all user profile like this, as shown in Figure 3.Can see among Fig. 3 the user is divided into two-layer, above the user (user 5 and 6) of one deck be exactly so-called good user, and the user of following one deck (user 1,2,3,4) then is the difference user.Time slot of each difference CU is represented with a blockage, and in this time slot, a good user's information and nonopiate multiplexing common afterwards transmission of cutting apart of its process will be arranged.For example, what user 1 took is first time slot, and user 5 information also will transmit in this time slot.Same, user 5 information also will transmit in the time slot that user 2 takies.
The present invention can realize by computer software, also can realize by programmable logic device FPGA.
This multiplexing method utilized the signal to noise ratio difference between the different user, realized nonopiate multiplexing between two users, improved throughput of system.For example in a white gaussian additive noise down channel that has two users, if two user's signal to noise ratios are respectively 5dB, 15dB is after having adopted this multiplexing method, two user's data rates are compared with the system of time-division, have improved 38% and 20% respectively.Simultaneously, owing in group and group and group, adopt the time division multiplexing of quadrature between the different time-gap, avoided realizing the complexity of a plurality of user's non-orthogonal systems.
Claims (3)
1. the nonopiate multiplexing method of cutting apart combination with the time-division of cutting apart, contain time-multiplexed step, it is characterized in that: at the transmitting terminal of radio honeycomb communication system down channel, under hardware supports, in same time slot, the constellation crossover method of utilizing non-orthogonal codes to divide between the very big user of two signal to noise ratio difference realizes in order to transmit the nonopiate multiplexing of two groups of independent information simultaneously, i.e. cluster constellation point in poor user's the information decision nebula, and the nebula point in good user's the information decision nebula; But the information between other users that above-mentioned two users in the same time slot are interior with different time slots or different groups are interior is time-multiplexed.
2. the nonopiate multiplexing method of cutting apart combination with the time-division of cutting apart according to claim 1, it is characterized in that: described group is promptly divided into groups, in each grouping, the shared time slot of each difference user is identical, a good user then is that each time slot is public, thereby exist the user that two signal to noise ratios differ greatly in each impartial time slot of having realized dividing into groups, and the shared time slot of each grouping equates.
3. the nonopiate multiplexing method of cutting apart combination with the time-division of cutting apart according to claim 1 and 2, it is characterized in that: described method contains following steps successively:
(1) the size ordering of all users in the sub-district according to known average received signal to noise ratio, select (1/ (N+1)) the individual user of signal to noise ratio maximum, these users have been called the user, remaining user becomes poor user, good user is an Integer N with difference user's number ratio, promptly 1: N;
(2) these user grouping, in 1: the ratio grouping of N, at first form one group since a highest good user and N the highest poor user of signal to noise ratio of signal to noise ratio; Remaining user handles like this, all is assigned with up to all users;
(3) the identical time slot of assigning to each difference user is divided into N time period to grouping, has 1 poor user and 1 good user's information to adopt the nonopiate multiplexing of constellation crossover formula, each signaling point (x of good user in each time period
1) all be superimposed on respectively poor user each signaling point (x
2) on, the signal x after the multiple connection
12=x
1+ x
2
(4) between different group and the group, between each time slot in the grouping, adopt the quadrature time division way.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101553030B (en) * | 2008-04-03 | 2011-06-01 | 华为技术有限公司 | Method and equipment for repeatedly using same time slot by multiple users |
| CN101577959B (en) * | 2008-05-08 | 2011-08-03 | 华为技术有限公司 | Method and device for multiplexing multi-user time slots |
| CN101553032B (en) * | 2008-04-03 | 2012-11-21 | 华为技术有限公司 | Channel allocating method, device and base station sub-system |
| CN104871464A (en) * | 2012-12-28 | 2015-08-26 | 株式会社Ntt都科摩 | Wireless base station, user terminal, wireless communication method, and wireless communication system |
-
2003
- 2003-06-18 CN CN 03137566 patent/CN1246989C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101553030B (en) * | 2008-04-03 | 2011-06-01 | 华为技术有限公司 | Method and equipment for repeatedly using same time slot by multiple users |
| CN101553032B (en) * | 2008-04-03 | 2012-11-21 | 华为技术有限公司 | Channel allocating method, device and base station sub-system |
| CN102916794B (en) * | 2008-04-03 | 2015-08-19 | 华为技术有限公司 | Method for channel allocation, device and base station sub-system |
| CN101577959B (en) * | 2008-05-08 | 2011-08-03 | 华为技术有限公司 | Method and device for multiplexing multi-user time slots |
| CN104871464A (en) * | 2012-12-28 | 2015-08-26 | 株式会社Ntt都科摩 | Wireless base station, user terminal, wireless communication method, and wireless communication system |
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