CN1309198C - Method of improving transmit diversity reliability by including interleaving the transmit data in a single time slot - Google Patents
Method of improving transmit diversity reliability by including interleaving the transmit data in a single time slot Download PDFInfo
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- CN1309198C CN1309198C CNB028163362A CN02816336A CN1309198C CN 1309198 C CN1309198 C CN 1309198C CN B028163362 A CNB028163362 A CN B028163362A CN 02816336 A CN02816336 A CN 02816336A CN 1309198 C CN1309198 C CN 1309198C
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000005540 biological transmission Effects 0.000 claims abstract description 10
- 230000011218 segmentation Effects 0.000 claims description 10
- 230000004044 response Effects 0.000 claims description 9
- 238000013507 mapping Methods 0.000 claims description 5
- 238000012937 correction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 108010003272 Hyaluronate lyase Proteins 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000000295 emission spectrum Methods 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0071—Use of interleaving
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
- H04L1/0618—Space-time coding
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
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- Mobile Radio Communication Systems (AREA)
Abstract
In a telecommunication system a method of transmitting digitised data via at least two transmission paths channels and including the step of applying interleaving in the space domain i.e. interleaving in a single time slot. This preferably includes the steps of: -coding the data by spreading the data using a number of spr eadi ng codes - applying interleaving in the space domain frame segmenting the data and - transmitting said data via at least two antennas. Interleaving may be applied across the time domain also.
Description
Background
The present invention relates to improve the method for transmit diversity reliability.
In mobile communication system, term " transmit diversity " is the known technology that is used for improving by the different transmission paths that are provided to mobile receiver the down link receptivity.
For example, when base station (transceiver) when a mobile comm unit (phone) receives data, can determine any paths, just the base station can provide for the optimum reception from the signal of mobile comm unit this moment.Therefore, can suppose that replying emission to mobile comm unit follow-up also is to carry out from the base station with optimum reception.This is that just channel impulse response is identical in both direction because link can be assumed to be reciprocal channel.
Feedback information from the receiver of mobile comm unit shows that it is best from which base station launching.This technology is known as " switching (switched) antenna diversity ".If the characteristic signal decline that is applied to every transmission path is by fully decorrelation, then all transmission paths are reduced by the possibility of signal fadeout equally.
Prior art
Disclosed International Patent Application WO-A-01/65760 (nokia networks 0Y) has described the system of use with the space-time code of turbo coded combination.Launch the signal of space-time code via multichannel communication system, so that improve emission spectra efficient.
Described system seems to use the convolution code of a parallel or serial link.Multinomial by generator output is mapped to different antennas.Interleaver is the part of standard linkage sign indicating number, wherein carries out to interweave between coding step.Replace different generator polynomial output is multiplexed in the single stream, different generator polynomials is multiplexed in the different antennas.After error correction coding and be not to carry out as the part of error correction coding process to interweave.
Develop multiple emission diversity scheme, comprised above-mentioned switched antenna diversity.It also is known postponing diversity, wherein carries out identical emission from each antenna, but intentionally introduces a known delay between emission.
There are many problems in switched antenna diversity.At first, need a reciprocal channel accurately to show identical feature for a signal.This is unapproachable in practice.For example, if mobile phone moves, then the decision of being made by the base station about emission " replying " signal on which paths does not provide best reciprocity path.This is because to the time that in fact emission takes place, a different base station may be more suitable in launching via an alternate link or path.
In adopting the system of code division multiple access, different extended codes or not on the same group extended code be assigned to different users.If use a fixing spreading factor, then, adopt different emission rates by a plurality of extended code expanded data by forming code character more than.The sign indicating number of many code characters is launched concurrently.
An object of the present invention is to overcome the problems referred to above.
Summary of the invention
According to a first aspect of the invention, provide a kind of method of launching digitalized data via at least two transmission paths (channel) in telecommunication system, this method is included in the step that application data interweaves in the spatial domain.
Described method preferably is used the following step and carries out:
A), thereby data are encoded by using a plurality of extended codes to come growth data;
B) application interweaves for coded data in spatial domain;
C) carry out the frame segmentation for coded data; And
D) launch the data of described frame segmentation via at least two antennas.
When using many yards emissions, when wherein different sign indicating numbers was mapped to different antennas, the inventor had determined a kind of method that overcomes the problems referred to above.
In a preferred embodiment, interweave and also be applied in the time-domain.
Be assigned under a user's the situation at a plurality of sign indicating numbers, may adopt an emission diversity scheme, wherein the data that will be sent out at first are interleaved and are divided into M data flow.Then, use an extended code to expand and modulate each data flow in M the data flow.Then, launch modulated and expanded data via one of N transmitting antenna.When adopting the advantage of the diversity emission of this form to appear at chnnel coding to be employed, particularly be longer than and be applied to the interweaving during the cycle of each code block in the duration of fading.
When declining by height correlation, on the duration of a code block, it is relatively poor that the performance of any error correction decoder will become.By launching different data flow via different antennas and passing different data flow and use and interweave, the decorrelation of passing the decline of code block occurs, and the performance of the improvement by error correcting code has realized diversity gain.
Interweave is a kind ofly to be used to prevent that serious data from losing and the technology of extended error when using with an error correcting code.When in time-domain, using a data block, obtain a piece that interweaves.Then, if adopt the emission form of a branch time slot, then this piece that interweaves is launched by segmentation and in different time slots.As the result who interweaves, data bit in being inserted into time slot before by slippage.In receiver, the data of slippage are resequenced.If the data in time slot are for example because decline and lost, destroy or damages, the chance that then has a data maintenance that arrives in subsequent timeslot can't harm.Therefore, the data that mistake is expanded and the subsequent applications of error correction method allows to lose are more effectively recovered.
Description of drawings
Also the present invention is described with reference to the accompanying drawings for example below, in the accompanying drawings:
Fig. 1 is schematically illustrating of a simple embodiment of the present invention, and it shows and uses interweaving in coding (space) territory to carry out downlink transmission via a plurality of antennas;
Fig. 2 represents another embodiment that interweaves in employing time and coding (space) territory; And
Fig. 3 comparison shows that and wherein also comprised an alternative embodiment of the invention that time-domain interweaves.
The detailed description of the preferred embodiment of the present invention
Example 1
In system shown in Figure 1, at first use convolution coder 1 to encode for the data of emission.Other encoder such as turbine (turbo) encoder also can be used.At next stage 2, in spatial domain, interweaving before the segmentation for coded data.This is to realize by interweaving for the data that will be launched in a single time slot before the parallel data block in segmentation 3.Utilize each sign indicating number of many code characters to come transmit data blocks.Hereinafter this is interweaved and be called interweaving in spatial domain, and all should be made an explanation as described above for its any reference.After this one-level, the data that launch in each yard are modulated according to a known spread function and are expanded 4.Then, launch described data by one of antenna in the base station 5.
Example 2
This example is similar to above-mentioned example 1, but is included in the additional stages that interweaves in the time-domain, and this is shown 6 in Fig. 2.Data also are encoded.Then, resulting data are passed a plurality of frames and are interweaved and be segmented into the data that will launch in each frame.The data of a frame are mapped to a plurality of extended codes in a single time slot.Above-mentioned frame interleaving process comes down to time-interleaved.
Then, the territory, application space interweaves.This realizes by following process, and aforesaid the application for the data of emission in a time slot interweaves; Just time slot interleaving is a kind of method that the application code territory interweaves.
Next, data are divided into a plurality of sections.Each section is used a different extended code and launches.Launch growth data via different antennas.If M extended code forms code character more than and N transmitting antenna arranged, then according to n=mod
NM obtains the simple mapping of extended code to antenna, and wherein n is that transmitting antenna index (index) and m are the extended code index.
Receive emission by mobile phone.Signal is suffered testing process then by despreading, comprises a channel impulse response estimator and a suitable detection algorithm.The possibility that the data of emission must be supported is: the receiver base station is estimated each transmission path of mobile phone and corresponding channel impulse response is associated with one or more extended codes of many code characters.This can obtain by for example being used in specific given data sequence in the UTRA TDD system or the knowledge by specific known data sequence of transmitting antenna and antenna code mapping with multiple mode.After detecting, before decoded, data are deinterlaced.
Because it is its oneself channel impulse response that N transmission path, the feature of each are arranged, so the device of a channel impulse response estimation of needs.In UTRA (access of UMTS terrestrial radio) TDD (time division duplex) system, data are launched in pulse train, and each pulse train comprises two data fields of any side of a known midamble sequence.This unique midamble sequence can come to be associated with an extended code according to a default mapping, and therefore, mobile phone can obtain the channel estimating that is associated with each extended code, and this is enough for testing goal.Mobile phone need be about the information of extended code to the mapping of antenna.
The technology of describing in the example 2 provide with the TDD system in the identical performance of switched antenna diversity, wherein the reciprocity character of channel is used to select from which antenna to launch.An interweave advantage of transmit diversity of space-time is the existence that it does not rely on any feedback, and can be used to Common Control Channel.
Fig. 3 shows an interweave example of the performance that obtained of use space-time for a typical multipath channel models.In this example, one 64k bps channel is used one 1/3 speed turbine code and encodes and be used 6 extended codes that are mapped to two antennas and launch.The interweave performance of (S-TI) of space-time is illustrated as and can compares with switched antenna diversity (SA), and switched antenna diversity depends on from the emission of mobile phone launches from so that determine for which antenna.
Utilize the embodiment of demonstration to describe the present invention above, should be appreciated that under the situation that does not depart from the scope of the invention, can make various changes the present invention.
Claims (11)
1. method of launching digitalized data via at least two transmission paths or channel in tdd systems, this method comprises by the data that will launch are interweaved the step that application interweaves in spatial domain in an independent time slot.
2. the method for claim 1 is included in described the following step of using in spatial domain by the data that will launch are interweaved before the step that interweaves in an independent time slot:
(1) use error correcting code that data are encoded;
Also be included in the described step the following step afterwards that interweaves of in spatial domain, using by the data that will launch are interweaved in an independent time slot:
(2) data after interweaving are carried out segmentation;
(3) use different extended codes that data are carried out modulation and expansion;
(4) launch described data via at least two antennas.
3. method as claimed in claim 2 also is included in described step (1) and described the following step of using in spatial domain by the data that will launch are interweaved between the step that interweaves in an independent time slot:
(5) passing the time-domain application interweaves.
4. method as claimed in claim 3, a plurality of frames interweave wherein said step (5) and the step of further segmentation is carried out by passing.
5. as any one described method in the claim 2 to 4, be included in described step (4) code antenna mapping steps before.
6. method that is used to receive according to the data of any one claim emission of front comprises step:
H) from a plurality of channels, receive data corresponding to a plurality of antennas;
I) separate extended code to one and be applied to described data;
J) be channel impulse response of each channel estimating;
K) channel impulse response is associated with one or more extended codes in many code characters;
L) described data are carried out deinterleaving; And
M) application decoder.
7. tdd systems that is used for launching via at least two transmission paths or channel digitalized data, this system has by the data that will launch in an independent time slot are interweaved in spatial domain described data is used the device that interweaves.
8. system as claimed in claim 7 also comprises:
Thereby come growth data that data are carried out apparatus for encoding by using error correcting code;
Data after interweaving are carried out the device of segmentation;
The device that uses different extended codes that data are modulated and expanded; And
Launch the device of the data of segmentation via at least two antennas.
9. system as claimed in claim 7 also has the device that the time-domain of passing interweaves in addition.
10. system as claimed in claim 9 wherein saidly passes device that time-domain interweaves and is used to also pass that a plurality of frames interweave and further segmentation.
11. a system that is used for receiving according to the data of any one emission of claim 7 to 10 comprises:
H) from device corresponding to reception data a plurality of channels of a plurality of antennas;
I) use the device of despreading for described data;
J) be the device of each channel estimating channel impulse response;
K) device that channel impulse response is associated with one or more extended codes of many code characters;
L) described data are carried out the device of deinterleaving; And
M) device of application decoder.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0120535A GB0120535D0 (en) | 2001-08-23 | 2001-08-23 | Space-time interleaving transmit diversity |
| GB0120535.0 | 2001-08-23 | ||
| GB0127207.9 | 2001-11-10 | ||
| GB0127207A GB2379136B (en) | 2001-08-23 | 2001-11-10 | Method of improving transmit diversity reliability |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1545780A CN1545780A (en) | 2004-11-10 |
| CN1309198C true CN1309198C (en) | 2007-04-04 |
Family
ID=26246466
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB028163362A Expired - Lifetime CN1309198C (en) | 2001-08-23 | 2002-08-20 | Method of improving transmit diversity reliability by including interleaving the transmit data in a single time slot |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1419605A1 (en) |
| CN (1) | CN1309198C (en) |
| WO (1) | WO2003019849A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7725084B2 (en) * | 2003-11-24 | 2010-05-25 | Nokia Corporation | Apparatus, and associated method, for communicating communication data in a multiple-input, multiple-output communication system |
| GB2408898B (en) * | 2003-12-02 | 2006-08-16 | Toshiba Res Europ Ltd | Improved communications apparatus and methods |
| ATE476028T1 (en) * | 2004-12-13 | 2010-08-15 | Mitsubishi Electric Corp | METHOD, SYSTEM AND DEVICE FOR EVEN DISTRIBUTED DATA TRANSMISSION IN MIMO TRANSMISSION SYSTEMS |
| CN101299627B (en) * | 2007-05-03 | 2012-12-26 | 上海贝尔股份有限公司 | Mobile terminal and method for transmitting message frame |
| CN101159510B (en) * | 2007-11-16 | 2011-09-28 | 海能达通信股份有限公司 | Method for improving dependability of information bit transmission |
| US8737502B2 (en) | 2009-02-09 | 2014-05-27 | Qualcomm Incorporated | Multiplexing and coding schemes for multiple transmit antennas in a wireless communication system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1277759A (en) * | 1998-09-14 | 2000-12-20 | 诺基亚网络有限公司 | Rake receiver |
| WO2001029986A1 (en) * | 1999-10-19 | 2001-04-26 | Nokia Networks Oy | Optimising link quality by space and time interleaving |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2308796T3 (en) * | 1998-08-21 | 2008-12-01 | Lucent Technologies Inc. | CDMA MULTI-CODE SYSTEM THAT USES AN ITERATIVE DECODIFICATION. |
-
2002
- 2002-08-20 CN CNB028163362A patent/CN1309198C/en not_active Expired - Lifetime
- 2002-08-20 EP EP02796256A patent/EP1419605A1/en not_active Ceased
- 2002-08-20 WO PCT/EP2002/009344 patent/WO2003019849A1/en not_active Application Discontinuation
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1277759A (en) * | 1998-09-14 | 2000-12-20 | 诺基亚网络有限公司 | Rake receiver |
| WO2001029986A1 (en) * | 1999-10-19 | 2001-04-26 | Nokia Networks Oy | Optimising link quality by space and time interleaving |
Non-Patent Citations (1)
| Title |
|---|
| ETSI TS 125222 V3.6.0-UNIVERSAL MOBILE TELECOMMUNICATIONS SYSTEM(UMTS),MULTIPLEXING AND C，第8页4.1到第11页4.2.1之前，图1，第19页到第20页4.2.5节，第29页4.2,11到第， 2001 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1545780A (en) | 2004-11-10 |
| WO2003019849A1 (en) | 2003-03-06 |
| EP1419605A1 (en) | 2004-05-19 |
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