CN101227213A - Method for implementing space division multiple access transmission for multi users in wireless communication system - Google Patents
Method for implementing space division multiple access transmission for multi users in wireless communication system Download PDFInfo
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- CN101227213A CN101227213A CNA200710000935XA CN200710000935A CN101227213A CN 101227213 A CN101227213 A CN 101227213A CN A200710000935X A CNA200710000935X A CN A200710000935XA CN 200710000935 A CN200710000935 A CN 200710000935A CN 101227213 A CN101227213 A CN 101227213A
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Abstract
A method which is provided according to the invention and realizes a space division multiple access transmission for a plurality of users in a radio communication system comprises: firstly, dividing a plurality of transmitting antennae into a first antenna group which is corresponded to a first user group and has signal-to-noise ratio of a high transmission channel and a second antenna group which is corresponded to a second user group and has the signal-to-noise ratio of a low transmission channel, secondly, respectively confirming a candidate user of the first use group and a candidate user of the second use group in a plurality of the users according to the first antenna group and the second antenna group, thirdly, respectively choosing a first user and a second user which are used to form the space division multiple access grouping from the candidate user of the first use group and the candidate user of the second use group according to power distributing condition and service quality requirement, and fourthly, transmitting data of the first user and the second user in the space division multiple access grouping from the base station by utilizing the first antenna group and the second antenna group through adopting space division multiple access mode to the first user and the second user.
Description
Technical field
The invention belongs to wireless communication technology field, particularly, relate to a kind of method that in wireless communication system, a plurality of users is realized the space division multiple access transmission, by the user being divided into groups to reduce the interference between the user in the space division multi-access.
Background technology
Space division multiple access (SDMA) is a kind of communication of effective raising power system capacity.In SDMA, base station end (Node-B) disposes a plurality of antennas, and Node-B while and a plurality of subscriber equipment (UE) communicate, and UE disposes one or more antennas.SDMA utilizes to adopt different transmission antenna group to communicate the difference of the space channel feature that produces between the multi-user to different UE, thereby is implemented in the multiple user signals transmission on identical time, same frequency, the same code territory.
In the prior art, although transmitting terminal employing weighting technique reduces the interference problem between the user, the subject matter that exists among the SDMA remains the interference that how further reduces between the user.
For the problem that how further to reduce inter-user interference, can reduce the interference between the user by transmitting terminal multi-user's grouping, but also not occur custom-designed user packet method at present.The present invention proposes the method for user grouping among a kind of effective SDMA, can reduce the interference between the user.
Summary of the invention
In order to overcome defective of the prior art the present invention has been proposed, the objective of the invention is to propose a kind of method that in wireless communication system, a plurality of users is realized the space division multiple access transmission, by the user being divided into groups to reduce the interference between the user in the space division multi-access.
To achieve these goals, proposed a kind of method that in wireless communication system, a plurality of users is realized space division multiple access transmission, having comprised: a) a plurality of transmitting antennas of base station have been divided into to organize and correspondingly have first antenna sets of high-transmission channel signal to noise ratio and organize corresponding second antenna sets with low transmission channel signal to noise ratio with second user with first user; B) at first antenna sets and second antenna sets, candidate user from a plurality of users in definite respectively first user group and the candidate user in second user group; C), select to be used to form first user and second user of space division multiple access grouping respectively in the candidate user in candidate user from first user group and second user group according to power division condition and quality of service requirement; And d) utilizes first antenna sets and second antenna sets, will adopt the space division multiple access mode to be transmitted into described first user and the two or two user from first user in the space division multiple access grouping and second user's data by the base station.
Preferably, in described step a), first antenna sets and second antenna sets make up at random and obtain.
Preferably, described step b) comprises: a plurality of users in the sub-district to base station feedback respectively with the information of first antenna sets and the corresponding received signal quality of second antenna sets; The base station according to and the corresponding feedback information of first antenna sets, the described a plurality of users of inferior ordered pair that reduce successively according to received signal quality arrange, and are candidate user during first user organizes with received signal quality greater than the user definition of predetermined threshold value; The base station according to and the corresponding feedback information of second antenna sets, the described a plurality of users of inferior ordered pair that reduce successively according to received signal quality arrange, and are candidate user during second user organizes with received signal quality less than the user definition of predetermined threshold value.
Preferably, if the candidate user of repetition is arranged in first user group and second user group, then only with the deletion from second user group of described candidate user.
Preferably, described step c) comprises: set total transmitting power P
tAnd setting threshold v
0, described threshold value under specific coding modulation scheme condition, error probability that can the bonding user below desired value, selective channel quality user relatively preferably from first user group, the noise power of setting described user place channel is P
g, and required quality of service requirement SINR 〉=v
1, judge
Whether set up,, then select described user as first user in the space division multiple access grouping if set up; Otherwise, described user is got rid of from first user group, and continue from first user group, to select first user in the manner described above, finish till all users in first user group up to selecting first user or traversal; Selective channel quality user relatively preferably in second user group, the noise power of setting described user place channel is P
b, required quality of service requirement SINR 〉=v
2, judge
Whether set up, if set up, then select described user as second user in the space division multiple access grouping, otherwise, described user is got rid of from second user group, and continue in the manner described above from second user's group selection, second user, finish till all users in second user group up to selecting second user or traversal.
Preferably, described step d) comprises: carry out transmit power allocations according to power division factor pair first antenna sets and second antenna sets, the described power division factor is
Thus, the power of second antenna sets distribution is mP
t, the power that first antenna sets is distributed is (1-m) P
t
Preferably, after step d), method of the present invention also comprises: the first received user's data is carried out least mean-square error with subscriber equipment and serial interference elimination detects, and detects and the second received user's data is only carried out least mean-square error.
The present invention utilizes difference in channel quality between the user and required service quality has differently proposed a kind of effective user packet method.Adopt space division multiple access wireless communication system of the present invention can show more performance, and by utilizing existing system hardware and software resource, the complexity of system increase seldom.
Description of drawings
Below in conjunction with the detailed description of preferred embodiment of accompanying drawing to being adopted, above-mentioned purpose of the present invention, advantage and feature will become apparent by reference, wherein:
Fig. 1 shows the schematic diagram according to SDMA system configuration of the present invention;
Fig. 2 shows according to the schematic diagram of " good user " of the present invention alternative set (first user group) with the building method of " difference user " alternative set (second user group);
Fig. 3 shows the processing procedure schematic diagram according to transmitting terminal of the present invention;
Fig. 4 shows the processing procedure schematic diagram according to receiving terminal of the present invention;
Fig. 5 shows the configuration diagram according to user equipment (UE) of the present invention; And
Fig. 6 shows according to the Signalling exchange schematic diagram between Node-B of the present invention and the UE.
Embodiment
The present invention centers on the method that the SDMA wireless communication system that comprises two users illustrates user grouping, but the scope of application of the present invention is not limited in the SDMA wireless communication system that comprises two users.
Performing step according to transmitting terminal of the present invention:
(1) Node-B that is equipped with a plurality of antennas at first is divided into two groups (first antenna sets and second antenna sets) to transmitting antenna, and one group (first antenna sets) is used for supporting " good user ", and another group (second antenna sets) is used for supporting " difference user ".The grouping of transmitting antenna is to make up at random, also can adopt additive method, as the statistical information according to channel, divides into groups.
(2) Node-B constructs " good user " alternative set (first user group) and " difference user " alternative set (second user group) according to user's feedback information.All correspond respectively to the received signal quality of two groups of transmitting antennas with feeding back to two information of Node-B per family in the sub-district; Node-B is according to corresponding to the feedback information of the transmission antenna group of supporting " good user " user being arranged, make received signal quality reduce successively, preestablish and adjustable signal quality threshold by one, received signal quality is defined as " good user " alternative set greater than user's group of threshold value; Node-B is according to corresponding to the feedback information of the transmission antenna group of supporting " difference user " user being arranged, make received signal quality reduce successively, preestablish and adjustable signal quality threshold by one, received signal quality is defined as " difference user " alternative set less than user's group of threshold value; If the user of repetition is arranged in top two alternative set, then only this user is deleted from " difference user " alternative set.
(3) Node-B selects " good user " and " difference user " (first user and second user) respectively in " good user " alternative set and " difference user " alternative set, two selected users form a grouping (space division multiple access grouping), if can not select, then this Node-B can not support that temporarily the SDMA mode sends data.
(4) to " good user " in the space division multiple access grouping and " difference user " respectively according to selected code efficiency, interleaving mode, mapping mode execution digital coding, interweave, operation such as mapping.
(5) carry out power division according to two groups of transmitting antennas of power division factor pair after, send respectively.
The step of user grouping is:
(1) sets total transmitting power P
tSelected threshold value v
0, under a certain coded modulation scheme condition, the error probability that this value can the bonding user is below a desired value (as 10%).
(2) selective channel quality indication (be called CQI, refer to SINR here) user preferably in " good user " alternative set, the noise power of supposing this user place channel is P
g, required qos requirement SINR 〉=v
1, judge
Whether set up, if set up, then this user can be used as " good user " and enters the space division multiple access grouping, otherwise, this user is got rid of from " good user " alternative set, and continue selection " good user ".
(3) the power division factor is set at
Promptly the power of " difference user " distribution is mP
t, the power that " good user " distributes is (1-m) P
t
(4) select CQI user preferably in " difference user " alternative set, the noise power of this user place channel is P
b, required qos requirement SINR 〉=v
2, judge
Whether set up, if set up, then this user can be used as " difference user " and enters the space division multiple access grouping, otherwise, this user is got rid of from " difference user " alternative set, and " difference user " selected in continuation.
(5) after " good user " forms a space division multiple access grouping with " difference user ", just can adopt mode such as SDMA to carry out transfer of data.
The effect of wireless channel:
(1) by after the wireless channel transmission, the received signal of " difference user " is expressed as y
1=H
11x
1+ H
21x
2+ n
1, y wherein
1The signal vector that expression " difference user " receives, H
11Expression from the transmission antenna group of supporting " difference user " to the channel " differing from the user " reception antenna, H
21Expression from the transmission antenna group of supporting " good user " to the channel " differing from the user " reception antenna, n
1The equivalent Gaussian channel noise of expression " difference user ", x
1Expression Node-B sends to the information of " difference user ", x
2Expression Node-B sends to the information of " good user ";
(2) by after the wireless channel transmission, the received signal of " good user " is expressed as y
2=H
12x
1+ H
22x
2+ n
2, y wherein
2The signal vector that expression " good user " receives, H
12Expression from the transmission antenna group of supporting " difference user " to the channel " good user " reception antenna, H
22Expression from the transmission antenna group of supporting " good user " to the channel " good user " reception antenna, n
2The equivalent Gaussian channel noise of expression " difference user ";
(3) n
1And n
2Satisfy between the noise power
Relation.
The performing step of receiving terminal:
(1) " difference user " carries out following treatment step to data: " difference user " Data Detection: calculate
Right
Separate to be in harmonious proportion and decipher; CRC (cyclic redundancy) check if make mistakes, requires to transmit again this blocks of data by HARQ.
(2) " good user " carries out following treatment step to data: the Data Detection of interference user: calculate
Right
Separate to be in harmonious proportion and decipher; If the CRC check correct, is then calculated
If mistake is then calculated
Right
Separate to be in harmonious proportion and decipher; The CRC check if make mistakes, requires to transmit again this blocks of data by HARQ.
Describe the preferred embodiments of the present invention in detail below in conjunction with accompanying drawing.
During the SDMA wireless communication system comes, RNC (radio network center) controls a plurality of Node-B, the Node-B that is equipped with a plurality of antennas at first is divided into two groups to transmitting antenna, one group is used for supporting " good user ", another group is used for supporting " difference user ", the grouping of transmitting antenna is to make up at random, and the system configuration schematic diagram as shown in Figure 1.
The structure of " good user " alternative set and " difference user " alternative set as shown in Figure 2.Node-B constructs " good user " alternative set and " difference user " alternative set according to user's feedback information.All correspond respectively to the received signal quality of two groups of transmitting antennas with feeding back to two information of Node-B per family in the sub-district; Node-B is according to corresponding to the feedback information of the transmission antenna group of supporting " good user " user being arranged, make received signal quality reduce successively, preestablish and adjustable signal quality threshold SINRg by one, received signal quality is defined as " good user " alternative set greater than user's group of threshold value; Node-B is according to corresponding to the feedback information of the transmission antenna group of supporting " difference user " user being arranged, make received signal quality reduce successively, preestablish and adjustable signal quality threshold SINRb by one, received signal quality is defined as " difference user " alternative set less than user's group of threshold value; If the user of repetition is arranged in top two alternative set, then only this user is deleted from " difference user " alternative set.
The processing procedure of transmitter as shown in Figure 3.Node-B selects " good user " and " difference user " respectively in " good user " alternative set and " difference user " alternative set, two selected users form a grouping (space division multiple access grouping), if can not select, then this Node-B can not support that temporarily the SDMA mode sends data.Transmitter sends respectively after carrying out power division according to two groups of transmitting antennas of power division factor pair.Concrete steps are as described below.
Set total transmitting power P
tSelected threshold value v
0(under a certain coded modulation scheme condition, the error probability that this value can the bonding user is below 10%).At first, select " good user ": select a bigger user of SINR in " good user " alternative set, the noise power of supposing this user place channel is P
g, required qos requirement SINR 〉=v
1, judge
Whether set up, if set up, then this user can be used as " good user " and enters the space division multiple access grouping, otherwise, this user is got rid of from " good user " alternative set, and continue to select " good user ", or travel through complete set up to selecting.Then, the power division factor is set at
Promptly the power of " difference user " distribution is mP
t, the power that " good user " distributes is (1-m) P
t
Then, select " difference user ": select CQI user preferably in " difference user " alternative set, the noise power of this user place channel is P
b, required qos requirement SINR 〉=v
2, judge
Whether set up, if set up, then this user can be used as " difference user " and enters the space division multiple access grouping, otherwise, this user is got rid of from " difference user " alternative set, and continue to select " difference user ", or travel through complete set up to selecting.At last, transmitter need give " good user " emission a SIC index signal, illustrates that " good user " needs to adopt MMSE (least mean-square error)+(serial interference elimination) SIC algorithm to carry out the reception of signal.
The processing procedure of receiver as shown in Figure 4.UE can give Node-B by periodic feedback received signal quality CQI.For " difference user ", receiver is carried out the MMSE Data Detection, carries out demodulation, decoding and CRC check then.For " good user ", receiver can be received the SIC indication, and receiver is carried out the MMSE+SIC Data Detection, carries out demodulation, decoding and CRC check then.So the framework of UE as shown in Figure 5.
Fig. 6 has provided the Signalling exchange between Node-B and the UE.UE at first sends service request to Node-B, and report CQI, Node-B carries out the user grouping algorithm, judge that can this user carry out the transmission of SDMA pattern, if can carry out SDMA, judge that further this user is as " good user " or " difference user ", next just can carry out transfer of data.
The present invention utilizes difference in channel quality between the user and required service quality has differently proposed a kind of effective user packet method.Adopt space division multiple access wireless communication system of the present invention can show more performance, and by utilizing existing system hardware and software resource, the complexity of system increase seldom.
Although below show the present invention in conjunction with the preferred embodiments of the present invention, one skilled in the art will appreciate that under the situation that does not break away from the spirit and scope of the present invention, can carry out various modifications, replacement and change to the present invention.Therefore, the present invention should not limited by the foregoing description, and should be limited by claims and equivalent thereof.
Claims (7)
1. in wireless communication system, a plurality of users are realized the method that space division multiple access transmits for one kind, comprising:
A) a plurality of transmitting antennas of base station are divided into organize and correspondingly have first antenna sets of high-transmission channel signal to noise ratio and organize corresponding second antenna sets with low transmission channel signal to noise ratio with second user with first user;
B) at first antenna sets and second antenna sets, candidate user from a plurality of users in definite respectively first user group and the candidate user in second user group;
C), select to be used to form first user and second user of space division multiple access grouping respectively in the candidate user in candidate user from first user group and second user group according to power division condition and quality of service requirement; And
D) utilize first antenna sets and second antenna sets, will adopt the space division multiple access mode to be transmitted into described first user and second user from first user in the space division multiple access grouping and second user's data by the base station.
2. method according to claim 1 is characterized in that in described step a) first antenna sets and second antenna sets make up at random and obtain.
3. method according to claim 1 is characterized in that described step b) comprises:
A plurality of users in the sub-district to base station feedback respectively with the information of first antenna sets and the corresponding received signal quality of second antenna sets;
The base station according to and the corresponding feedback information of first antenna sets, the described a plurality of users of inferior ordered pair that reduce successively according to received signal quality arrange, and are candidate user during first user organizes with received signal quality greater than the user definition of predetermined threshold value;
The base station according to and the corresponding feedback information of second antenna sets, the described a plurality of users of inferior ordered pair that reduce successively according to received signal quality arrange, and are candidate user during second user organizes with received signal quality less than the user definition of predetermined threshold value.
4. method according to claim 3 is characterized in that if the candidate user of repetition is arranged in first user group and second user group, then only with the deletion from second user group of described candidate user.
5. method according to claim 1 is characterized in that described step c) comprises:
Set total transmitting power P
iAnd setting threshold v
0, described threshold value under specific coding modulation scheme condition, error probability that can the bonding user below desired value,
Selective channel quality user relatively preferably from first user group, the noise power of setting described user place channel is P
g, and required quality of service requirement SINR 〉=v
1, judge
Whether set up,
If set up, then select described user as first user in the space division multiple access grouping; Otherwise, described user is got rid of from first user group, and continue from first user group, to select first user in the manner described above, finish till all users in first user group up to selecting first user or traversal;
Selective channel quality user relatively preferably in second user group,
The noise power of setting described user place channel is P
b, required quality of service requirement SINR 〉=v
2, judge
Whether set up,
If set up, then select described user as second user in the space division multiple access grouping, otherwise, described user is got rid of from second user group, and continue in the manner described above from second user's group selection, second user, finish till all users in second user group up to selecting second user or traversal.
6. method according to claim 5 is characterized in that described step d) comprises: carry out transmit power allocations according to power division factor pair first antenna sets and second antenna sets, the described power division factor is
Thus, the power of second antenna sets distribution is mP
i, the power that first antenna sets is distributed is (1-m) P
i
7. method according to claim 1 is characterized in that also comprising after step d):
The first received user's data is carried out least mean-square error with subscriber equipment and serial interference elimination detects, and detects and the second received user's data is only carried out least mean-square error.
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|---|---|---|---|
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| CNA200710000935XA CN101227213A (en) | 2007-01-15 | 2007-01-15 | Method for implementing space division multiple access transmission for multi users in wireless communication system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101800584A (en) * | 2009-02-11 | 2010-08-11 | 大唐移动通信设备有限公司 | Space division multiple access method and device for indoor distributed system |
| WO2010088843A1 (en) * | 2009-02-06 | 2010-08-12 | 大唐移动通信设备有限公司 | Method, system and apparatus for space division multiple access and data demodulation |
| CN101964987A (en) * | 2009-07-24 | 2011-02-02 | 大唐移动通信设备有限公司 | Multi-user space division judgment method and equipment |
| CN103119993A (en) * | 2010-07-28 | 2013-05-22 | 英特尔公司 | Power loading in MU-MIMO |
| CN101764632B (en) * | 2008-12-23 | 2013-09-11 | 中兴通讯股份有限公司 | Mapping method and device of ports and antennae in long term evolution-time division duplex (LTE-TDD) indoor distribution system |
| CN112104582A (en) * | 2020-11-09 | 2020-12-18 | 电子科技大学 | I/Q domain modulation method, double domain modulation method and multiple access communication method |
-
2007
- 2007-01-15 CN CNA200710000935XA patent/CN101227213A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101764632B (en) * | 2008-12-23 | 2013-09-11 | 中兴通讯股份有限公司 | Mapping method and device of ports and antennae in long term evolution-time division duplex (LTE-TDD) indoor distribution system |
| WO2010088843A1 (en) * | 2009-02-06 | 2010-08-12 | 大唐移动通信设备有限公司 | Method, system and apparatus for space division multiple access and data demodulation |
| CN101800584A (en) * | 2009-02-11 | 2010-08-11 | 大唐移动通信设备有限公司 | Space division multiple access method and device for indoor distributed system |
| CN101800584B (en) * | 2009-02-11 | 2013-07-10 | 电信科学技术研究院 | Space division multiple access method and device for indoor distributed system |
| CN101964987A (en) * | 2009-07-24 | 2011-02-02 | 大唐移动通信设备有限公司 | Multi-user space division judgment method and equipment |
| CN103119993A (en) * | 2010-07-28 | 2013-05-22 | 英特尔公司 | Power loading in MU-MIMO |
| CN103119993B (en) * | 2010-07-28 | 2016-06-22 | 英特尔公司 | For the method and apparatus that the power in MU-MIMO loads |
| US9549378B2 (en) | 2010-07-28 | 2017-01-17 | Intel Corporation | Power loading in MU-MIMO |
| CN112104582A (en) * | 2020-11-09 | 2020-12-18 | 电子科技大学 | I/Q domain modulation method, double domain modulation method and multiple access communication method |
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