CN101425990B - Data transmission method and system - Google Patents
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- CN101425990B CN101425990B CN2007101643978A CN200710164397A CN101425990B CN 101425990 B CN101425990 B CN 101425990B CN 2007101643978 A CN2007101643978 A CN 2007101643978A CN 200710164397 A CN200710164397 A CN 200710164397A CN 101425990 B CN101425990 B CN 101425990B
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Abstract
The invention discloses a data transmission method and data transmission system for reduce interference between virtual antennas so as to promote integral performance of system. The inventive method comprises: modulating traffic data received from every cell, acquiring modulated data, the traffic data transmitted by every cell being identical after modulation; performing transmit diversity coding for modulated data and obtaining at least two path of data stream; modulating in OFDM for every path of data stream to acquire mapping data stream; mapping every path of mapping data stream to corresponding virtual antenna for transmission. The invention also discloses a data transmission system. The invention can effectively reduce interference between virtual antennas, thereby promoting integral performance of system.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of data transmission method and data transmission system.
Background technology
Along with express network technology and development of multimedia technology, the development trend of wireless network evolves to packet switching from circuit switching gradually, and various WiMAX access technologies emerge in an endless stream, and the broadcast multi-broadcasting multimedia service will extensively be carried out in the network in future.Single frequency network is the mode of the main deployment of broadcast multi-broadcasting multimedia service application, and promptly a plurality of sub-districts of network send identical data on a frequency, in the mode of the cell deployment of eating dishes without rice or wine to merge.The broadcast multi-broadcasting mode of single frequency network can be supported higher spectrum efficiency, and fairly simple network design provides as mobile TV the business of types such as mobile phone-downloaded.
Fig. 1 is the schematic diagram of broadcast multi-broadcasting single frequency network (MBSFN, Multicast Broadcast Single FrequencyNetwork), and a sub-district comprises one or more transmitting antenna, and MBMS is descending business, and promptly data send to the user from the base station.Here be divided into sub-district (is the sub-district of A as label among Fig. 1) that participates in MBSFN and the sub-district (is the sub-district of B as label among Fig. 1) that does not participate in MBSFN.
A kind of data transmission method is the data multiplex transmission in the prior art: as shown in Figure 2, with number in the figure is the sub-district of A, what promptly participate in MBSFN is distinguished into two classes for a short time: cell type A1 and cell type A2, concrete sorting technique can for: content indicated in the cell information according to each sub-district is classified to the sub-district.Wherein, all base stations of the sub-district of type A1 send identical data, and it is regarded as empty antenna 1; The base station of 2 sub-districts of type A sends identical data, and it is regarded as empty antenna 2, and the data that empty antenna 1 and empty antenna 2 are sent are inequality.Like this, just sending at receiving terminal as the data of two transmitting antennas.Because distance is far between the base station, so the correlation between antenna is very little, thus can access the multiplexing effect of better space, and then improved the throughput of system.
But, because two different data of each spontaneous emission of empty antenna of available technology adopting from the user side angle, then need two different antennas can receive all data;
In addition, since two different data of each spontaneous emission of empty antenna in the prior art, thus can there be interference between these two multiplexing empty antennas, if the terminal capability of user terminal (comprises the Data Receiving ability, when antijamming capability) weak, then can cause the data transmission performance of this terminal to reduce.
Summary of the invention
The technical problem that the embodiment of the invention solved has provided a kind of data transmission method and data transmission system, reduces empty interference between antennas, improves the entire system performance.
The data transmission method that the embodiment of the invention provides comprises: the business datum that receives from each sub-district is modulated, obtain modulating the back data, the business datum that described each sub-district sends is all identical after ovennodulation; Described modulation back data are carried out the transmit diversity coding, obtain the data flow of two-way at least; Each circuit-switched data stream is carried out modulating in OFDM obtain maps data streams; Each road maps data streams mapped on the corresponding virtual antenna launch.
The data transmission system that the embodiment of the invention provides comprises: the business datum modulating unit, and be used for the business datum that receives from each sub-district modulated and obtain modulating the back data, the business datum that described each sub-district sends is all identical after ovennodulation; The transmit diversity coding unit is used for that described modulation back data are carried out the transmit diversity coding and obtains the data flow of two-way at least; The OFDM modulating unit is used for that each circuit-switched data stream is carried out the OFDM modulation and obtains maps data streams; Map unit is used for each road maps data streams mapped on the corresponding virtual antenna and launches.
As can be seen from the above technical solutions, the embodiment of the invention has the following advantages:
In the embodiment of the invention, owing to the business datum that receives from each sub-district modulated obtains data after all identical modulation in each sub-district, encode to modulating the back data again, mapping, operations such as transmission are so the initial data of launching between the different empty antennas is identical, so there is not interference between the empty antenna, and the user receives all data does not need a plurality of antennas, and then has improved the overall performance of system.
Description of drawings
Fig. 1 is a MBSFN schematic diagram in the prior art;
Fig. 2 is a data multiplex transmission method sub-district schematic diagram in the prior art;
Fig. 3 is a data transmission method embodiment schematic diagram in the embodiment of the invention;
Fig. 4 is a data transmission system general illustration in the embodiment of the invention;
Fig. 5 is the first transfer of data contextual data transfer process figure in the embodiment of the invention;
Fig. 6 is the second transfer of data contextual data transfer process figure in the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of data transmission method and data transmission system, is used to reduce empty interference between antennas, thereby improves the entire system performance.
In the embodiment of the invention, owing to the business datum that receives from each sub-district modulated obtains data after all identical modulation in each sub-district, encode to modulating the back data again, mapping, operations such as transmission are so the initial data of launching between the different empty antennas is identical, so there is not interference between the empty antenna, and the user receives all data does not need a plurality of antennas, and then has improved the overall performance of system.
See also Fig. 3, data transmission method embodiment comprises in the embodiment of the invention:
301, according to plot planning information classified in the sub-district, determine the transmit diversity type of coding;
In the present embodiment, will divide into some classes for a short time according to the plot planning information that presets, concrete sorting technique can be prior art, does not limit in the embodiment of the invention.
In the present embodiment, plot planning information can comprise cell ID, the sign of physical antenna and number in the sub-district, and information such as cell signal strength are understandable that, plot planning information can comprise other relevant informations equally.
For ease of understanding, illustrate the cell classification process in the present embodiment below:
Obtain the plot planning information that all participate in the MBSFN sub-district, from plot planning information, read the averaged magnitude of each sub-district under each antenna footprint, can obtain the averaged magnitude of all sub-districts under all antenna footprints, can carry out cell classification according to the signal strength signal intensity balance principle afterwards, the averaged magnitude basically identical of the dissimilar sub-district after even must classify, simultaneously in order to ensure signal quality, a lowest signal intensity can also be set, the averaged magnitude of each class sub-district must be more than or equal to this lowest signal intensity, concrete classification can be adopted the trial algorithm of various loop iterations in the prior art, promptly combination and the cell classification by continuous modification sub-district makes up to satisfy the signal strength signal intensity balance principle, be that example describes with a concrete computing flow process below, be understandable that concrete assorting process is not limited thereto:
Suppose that one has 6 sub-districts that participate in MBSFN, be respectively S1, S2, S3, S4, S5 and S6, averaged magnitude is respectively 8,9, and 22,7,10,8, lowest signal intensity is 20, then find that by analyzing except that the S3 of sub-district, the averaged magnitude of all the other arbitrary sub-districts all is less than or equal to half of lowest signal intensity, promptly except that the S3 of sub-district, the averaged magnitude sum of any two other sub-districts does not all reach lowest signal intensity, so two class sub-districts are then attempted being divided in the sub-district that can't be divided three classes, and can obtain final classification results: will divide into two classes for a short time by the permutation and combination algorithm, category-A comprises S1, S2, S4 and S6, category-B comprises S3 and S5, category-A cell signal mean intensity is 32, and category-B cell signal mean intensity is 32 also, meets the signal strength signal intensity balance principle.
In the present embodiment, after cell classification is finished, the corresponding empty antenna in each class sub-district, so-called empty antenna, be meant the set of physical antennas all in a certain class sub-district, determine the number of empty antenna, determine the transmit diversity type of coding by the number of empty antenna again by the number of cell type.The transmit diversity type of coding can for but be not limited to following several: space-time block code (STBC), space frequency block coding (SFBC), time switched transmit diversity (TSTD), frequency switched transmit diversity (FSTD), cyclic delay diversity (CDD), and the combination of above-mentioned several transmit diversities (as SFBC+FSTD).Each diversity type of coding can be encoded to business datum the several data flow, the corresponding empty antenna of each circuit-switched data stream, determine the diversity scheme that to take so can utilize the number of empty antenna, two empty antennas are for example arranged, then can adopt STBC or SFBC mode, four empty antennas are for example arranged, then can adopt the mode of SFBC+FSTD.
Need to prove that the sub-district described in the present embodiment is for participating in the sub-district of MBSFN.
302, business datum is modulated the data after obtaining modulating;
When each sub-district began data interaction, the business datum that each sub-district at first will need to send was sent to data transmission system;
Data transmission system is modulated the business datum that receives from each sub-district, and the business datum that each sub-district sends is all identical after ovennodulation.
In the present embodiment, can adopt the mode of quarternary phase-shift keying (QPSK) (QPSK) or two-phase phase shift keying (BPSK) that business datum is modulated, the business datum that receives is mapped as symbol data the modulation of business datum.
303, the data after the modulation are carried out the transmit diversity coding, obtain plurality of data stream;
Type according to the definite transmit diversity coding of step 301 is carried out the data flow that corresponding codes obtains several to the data after modulating.
304, each circuit-switched data stream is carried out OFDM (OFDM, Orthogonal FrequencyDivision Multiplex) modulation and obtain maps data streams;
In the present embodiment, data stream is carried out OFDM modulation can be regarded as and carry out the T/F conversion and add Cyclic Prefix (CP, Cyclic Prefix), wherein, the T/F conversion can adopt contrary fast fourier transform to realize.
In the present embodiment, CP generally is added on the end part of data symbol, can guarantee quadrature by adding a CP, prevents that promptly the auxilliary carrier wave from obscuring mutually with another carrier wave.
305, each road maps data streams is mapped on the corresponding virtual antenna launch.
In the present embodiment, the corresponding empty antenna in each class sub-district, this void antenna specifically is meant the set of physical antennas all in such sub-district, then launches data on empty antenna, promptly is the identical data of emission on all physical antennas in such sub-district.
In the present embodiment, owing to the business datum that receives from each sub-district modulated obtains data after all identical modulation in each sub-district, encode to modulating the back data again, mapping, operations such as transmission, so the initial data of launching between the different empty antennas is identical, the problem that does not exist signal to disturb between the identical data, so between different empty antennas, do not have interference yet, and then can improve the overall performance of system;
Secondly, because the initial data of launching between the empty antenna is identical, does not need a plurality of antennas so the user receives all data, and then simplified the handling process of user terminal;
Once more, when carrying out cell classification, adopt the signal strength signal intensity balanced algorithm to be classified in the sub-district that participates in MBSFN in the embodiment of the invention, institute so that classification afterwards the averaged magnitude of all kinds of sub-districts is similar substantially, so the communication quality between can all kinds of sub-districts of balance;
In addition, owing to adopt the OFDM mode to be mapped on the empty antenna to the data flow behind the coding in the embodiment of the invention, needing in mapping process increases CP to data flow, thus can effectively prevent obscuring between auxilliary carrier wave and the carrier wave, and then improve data transmission efficiency.
See also Fig. 4, data transmission system comprises in the embodiment of the invention:
Business datum modulating unit 401, be used for to the business datum that receives from each sub-district modulate obtain modulating the back data, data are all identical in each sub-district after the described modulation;
Transmit diversity coding unit 402 is used for described modulation back data are carried out the data flow that the transmit diversity coding obtains several;
OFDM modulating unit 403 is used for that each circuit-switched data stream is carried out the OFDM modulation and obtains maps data streams;
In the present embodiment, this data transmission system can also comprise:
In the present embodiment, plot planning information can comprise cell ID, the sign of physical antenna and number in the sub-district, and information such as cell signal strength are understandable that, plot planning information can comprise other relevant informations equally.
In the present embodiment, the concrete function of cell classification unit 406 can for:
Obtain the plot planning information that all participate in the MBSFN sub-district, from plot planning information, read the averaged magnitude of each sub-district under each antenna footprint, can obtain the averaged magnitude of all sub-districts under all antenna footprints, can carry out cell classification according to the signal strength signal intensity balance principle afterwards, the averaged magnitude basically identical of the dissimilar sub-district after even must classify, simultaneously in order to ensure signal quality, a lowest signal intensity can also be set, the averaged magnitude of each class sub-district must be more than or equal to this lowest signal intensity, concrete classification can be adopted the trial algorithm of various loop iterations in the prior art, and promptly combination and the cell classification by continuous modification sub-district makes up to satisfy the signal strength signal intensity balance principle.
Be understandable that, concrete algorithm flow can with the cell classification algorithm flow example class described in the previous embodiment seemingly, repeat no more herein.
With two instantiations the technical scheme in the embodiment of the invention is described below:
One, single coding:
That supposes to participate in MBSFN divides into two classes for a short time, concrete sorting technique and the sorting technique in the previous embodiment are similar, repeat no more herein, then need two empty antennas, promptly need business datum is divided into two paths of data stream, see also Fig. 5, the transfer of data flow process specifically describes and is in the embodiment of the invention:
Obtain symbol data s after business datum modulated
1, s
2, through obtaining encoder matrix behind the STBC coding:
Wherein, the different different antenna of line display in the matrix, the time is shown in tabulation.
Promptly import two symbol s in order
1, s
2, exporting first data flow is s
1,-s
2 *, exporting second data flow is s
2, s
1 *
Respectively first data flow and second data flow are carried out the OFDM operation and obtain first maps data streams and second maps data streams, first maps data streams is mapped on the empty antenna 1 launch, second maps data streams is mapped on the empty antenna 2 launch.
Being that example describes with STBC in the present embodiment, being understandable that, can be other coded system equally, SFBC for example, and concrete implementation is similar, repeats no more herein.
Two, assembly coding:
That supposes to participate in MBSFN divides into four classes for a short time, concrete sorting technique and the sorting technique in the previous embodiment are similar, repeat no more herein, then need four empty antennas, promptly need business datum is divided into four circuit-switched data stream, see also Fig. 6, the transfer of data flow process specifically describes and is in the embodiment of the invention:
Obtain symbol data s after business datum modulated
1, s
2, s
3, s
4Through obtaining first data flow and second data flow behind the FSTD coding, respectively first data flow and second data flow are carried out obtaining after SFBC encodes encoder matrix again:
Wherein, the different different empty antenna of line display in the matrix, frequency sub-carrier is shown in tabulation.s
1, s
2Through the SFBC coding, only take empty antenna 1,2, take subcarrier 1,2; s
3, s
4Through the SFBC coding, only take empty antenna 3,4, take subcarrier 3,4.
Will be through the 3rd data flow that obtains behind the SFBC coding, the 4th data flow, the 5th data flow and the 6th data flow are carried out the OFDM operation respectively, obtain the 3rd maps data streams, the 4th maps data streams, the 5th maps data streams and the 6th maps data streams map to these maps data streams on the corresponding virtual antenna and launch.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to finish by program, described program can be stored in a kind of computer-readable recording medium, this program comprises the steps: when carrying out
The business datum that receives from each sub-district is modulated, obtain modulating the back data, the business datum that described each sub-district sends is all identical after ovennodulation;
Described modulation back data are carried out the transmit diversity coding, obtain the data flow of two-way at least;
Each circuit-switched data stream is carried out modulating in OFDM obtain maps data streams;
Each road maps data streams mapped on the corresponding virtual antenna launch.
The above-mentioned storage medium of mentioning can be a read-only memory, disk or CD etc.
More than a kind of data transmission method provided by the present invention and data transmission system are described in detail, for one of ordinary skill in the art, thought according to the embodiment of the invention, part in specific embodiments and applications all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. a data transmission method is characterized in that, comprising:
The business datum that receives from each sub-district is modulated, obtain modulating the back data, the business datum that described each sub-district sends is all identical after ovennodulation, and the business datum that described each sub-district sends is identical;
Described modulation back data are carried out the transmit diversity coding, obtain the data flow of two-way at least;
Each circuit-switched data stream is carried out modulating in OFDM obtain maps data streams;
Each road maps data streams mapped on the corresponding virtual antenna launch, described empty antenna is the set of physical antenna all in a certain class sub-district.
2. method according to claim 1 is characterized in that, describedly the business datum that receives from each sub-district is modulated the step that obtains modulating the back data comprises:
Select to send the sub-district of identical services data;
Receive the business datum that described sub-district sends;
To the described business datum that receives modulate obtain modulating the back data.
3. method according to claim 1 is characterized in that, the described step that the business datum that receives from each sub-district is modulated comprises before:
According to plot planning information classified in the sub-district, obtain the number of cell type;
Determine the number of empty antenna according to the number of described cell type;
Determine the type of transmit diversity coding according to the number of described empty antenna.
4. method according to claim 3 is characterized in that, describedly carries out the step of transmit diversity coding and comprises modulating the back data:
Data after the described modulation are carried out space-time block code obtain first data flow and second data flow.
5. method according to claim 4 is characterized in that, describedly each circuit-switched data stream is carried out the step that OFDM modulation obtains maps data streams comprises:
Described first data flow and second data flow are carried out the T/F conversion;
Data flow after the described T/F conversion is added CP obtain first maps data streams and second maps data streams.
6. method according to claim 3 is characterized in that, describedly carries out the step of transmit diversity coding and comprises modulating the back data:
Data after the described modulation are carried out frequency switched transmit diversity coding obtain first data flow and second data flow;
Described first data flow and second data flow are carried out space frequency block coding obtain the 3rd data flow, the 4th data flow, the 5th data flow and the 6th data flow.
7. method according to claim 6 is characterized in that, describedly each circuit-switched data stream is carried out the step that OFDM modulation obtains maps data streams comprises:
To described the 3rd data flow, the 4th data flow, the 5th data flow and the 6th data flow are carried out the T/F conversion;
Data flow after the described T/F conversion is added CP obtain the 3rd maps data streams, the 4th maps data streams, the 5th maps data streams and the 6th maps data streams.
8. a data transmission system is characterized in that, comprising:
The business datum modulating unit is used for the business datum that receives from each sub-district modulated and obtains modulating the back data, and the business datum that described each sub-district sends is all identical after ovennodulation, and the business datum that described each sub-district sends is identical;
The transmit diversity coding unit is used for that described modulation back data are carried out the transmit diversity coding and obtains the data flow of two-way at least;
The OFDM modulating unit is used for that each circuit-switched data stream is carried out the OFDM modulation and obtains maps data streams;
Map unit is used for each road maps data streams mapped on the corresponding virtual antenna and launches, and described empty antenna is the set of physical antenna all in a certain class sub-district.
9. data transmission system according to claim 8 is characterized in that, described data transmission system also comprises:
Empty antenna is used to launch the maps data streams from described map unit.
10. according to Claim 8 or 9 described data transmission systems, it is characterized in that described data transmission system also comprises:
The cell classification unit is used for according to plot planning being classified in the sub-district;
The coding decision package is used for determining the transmit diversity type of coding according to the result of cell classification.
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| CN101425990B true CN101425990B (en) | 2011-04-13 |
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| CN101997650B (en) * | 2009-08-28 | 2014-07-30 | 华为技术有限公司 | Transmission method, device and system of multi-antenna system data signals |
| CN102223166B (en) * | 2010-04-15 | 2014-06-11 | 中国移动通信集团公司 | Transmitting station and signal transmission method |
| JP5388366B2 (en) * | 2010-06-21 | 2014-01-15 | 株式会社Ｎｔｔドコモ | Interference reduction method, radio base station, and radio communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1356793A (en) * | 2000-12-01 | 2002-07-03 | 株式会社日立制作所 | Wireless communication method and system using beam direction variable antenna |
| CN1474612A (en) * | 2003-07-10 | 2004-02-11 | 三星电子株式会社 | Intelligent autenna system combining self adaptive beam and self adaptive switch beam |
| CN101047416A (en) * | 2006-06-15 | 2007-10-03 | 华为技术有限公司 | Data transmission system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1356793A (en) * | 2000-12-01 | 2002-07-03 | 株式会社日立制作所 | Wireless communication method and system using beam direction variable antenna |
| CN1474612A (en) * | 2003-07-10 | 2004-02-11 | 三星电子株式会社 | Intelligent autenna system combining self adaptive beam and self adaptive switch beam |
| CN101047416A (en) * | 2006-06-15 | 2007-10-03 | 华为技术有限公司 | Data transmission system and method |
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