CN101374128B - Transmission method and apparatus for multi-input multi-output OFDM system - Google Patents
Transmission method and apparatus for multi-input multi-output OFDM system Download PDFInfo
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- CN101374128B CN101374128B CN2007101405005A CN200710140500A CN101374128B CN 101374128 B CN101374128 B CN 101374128B CN 2007101405005 A CN2007101405005 A CN 2007101405005A CN 200710140500 A CN200710140500 A CN 200710140500A CN 101374128 B CN101374128 B CN 101374128B
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Abstract
The invention discloses a transmitting method and a device for a multi-input multi-output orthogonal frequency-division multiplexing (OFDM) system, and aims to improve the signal transmitting performance of the multi-input multi-output system. The transmitting method mainly comprises the following steps: carrying out the channel encoding to a message to be transmitted; subjecting the channel-encoded result to the interleaving carrying out the constellation mapping to the interleaving encoding information to form a constellation cluster; carrying out the differential unitary space-frequency modulation to the elements in the constellation cluster based on the space-frequency block interleaving to obtain the signal to be transmitted on each antenna. By adopting the method and the device, the advantage of a DUSTM in a slow fading channel is inherited, and the good system performance in a rapid fading channel can be maintained.
Description
Technical field
Treatment technology when the present invention relates to moving communicating field empty relates in particular to the sending method and the device of a kind of multiple-input and multiple-output (MIMO) OFDM (OFDM) system.
Background technology
Multi-aerial radio communication system obtains people because can provide higher data transmission rate also to guarantee lower error code error probability and more and more notes.But most of multiaerial systems hypothesis receiving terminal known channel state information, and this can't guarantee as a rule are especially when time varying channel or transmitting terminal adopt more transmitting antenna.In order to address this problem, Hochwald and Sweldens modulated (Differential Unitary Space-TimeModulation is called for short DUSTM) scheme when proposing differential west space in 2000.Hughes also proposed similar scheme in 2000.
Modulation can be regarded as many antenna expansions of traditional differential phase keying (DPSK) during differential west space.In the DUSTM system, channel T coherence time must be not less than the twice of grouping time interval M, i.e. T 〉=2M.
At transmitting terminal, at first send unit matrix I
M, i.e. X
0=I
MCarry out differential modulation then, in time series τ=1, the sending metrix during 2... is expressed as follows:
X
τ=V
τX
τ-1Formula (1)
V wherein
τBe information matrix, its dimension is M * M.This matrix is selected to obtain from the west space-time modulation constellation group.
At receiving terminal, receiver is according to two continuous matrix Y that receive
τAnd Y
τ-1Carry out incoherent detection.Suppose according to channel: channel remains unchanged in T 〉=2M symbol period, so τ is identical with the channel matrix of τ-1 correspondence, and the signal that can obtain sending by coherent detection in fact just.
Be modulated at during differential west space and need not to know channel condition information (CSI, ChannelState Information) under the slow fading channel and can reach the channel heap(ed) capacity, thereby obtained increasing concern in recent years.But under fast fading channel, the performance of DUSTM worsens rapidly and presents higher error code flat bed.
Summary of the invention
Technical problem to be solved by this invention is sending method and the device that is to provide a kind of multi-input multi-output orthogonal frequency division multiplexing system, sends performance with the signal that improves multi-input multi-output system.
In order to solve the problems of the technologies described above, the invention provides a kind of dispensing device of multi-input multi-output orthogonal frequency division multiplexing system, comprising:
Encoder is used for the information that will send is carried out chnnel coding;
External interleaver is used for the coding result of described chnnel coding is carried out interleaving treatment;
The constellation mapping module is used for the coded message after the described interleaving treatment is carried out constellation mapping, and the structure constellation is trooped;
Based on the differential west space frequency modulator of sky frequency block interleaving, the element that is used for that described constellation is trooped carries out modulating frequently based on the differential west space of sky frequency block interleaving, obtains the signal to be sent on each antenna.
In the above-mentioned dispensing device, the chnnel coding that described encoder carries out can comprise low-density check code or Turbo coding.
In the above-mentioned dispensing device, described external interleaver can carry out described interleaving treatment to described coding result according to concatenated coding.
In the above-mentioned dispensing device, the described constellation of described constellation mapping module structure is trooped, its matrix of elements V
kAnd described matrix V
kTransposition V
k', can satisfy V
k-V
k' full rank and determinant V
k-V
k' the value maximum.
In the above-mentioned dispensing device, described differential west space frequency modulator based on sky frequency block interleaving can comprise:
Inner encoder, the element that is used for that described constellation is trooped carry out differential west space modulating-coding frequently, obtain empty matrix frequently at the tenth of the twelve Earthly Branches;
Cut apart module, be used for to described tenth of the twelve Earthly Branches empty matrix frequently carry out matrix and cut apart the submatrix after obtaining cutting apart;
The submatrix interleaver is used for the submatrix after described cutting apart is carried out the matrix interleaving treatment;
Orthogonal frequency division multiplexing modulator is used for the symbol after the described matrix interleaving treatment is carried out the OFDM modulation, obtains the signal to be sent on described each antenna.
Further, the described partitioning scheme of cutting apart module can comprise along spatial axes and cutting apart, and cut apart along frequency axis, or spatial axes, frequency axis two dimension is unified cuts apart.
Further, described submatrix interleaver can carry out described interleaving treatment according to the address of the submatrix after described cutting apart.Further, described submatrix interleaver can carry out described interleaving treatment from small to large successively according to the address of the submatrix after described cutting apart.
The present invention and then a kind of sending method of multi-input multi-output orthogonal frequency division multiplexing system is provided comprises:
(1) information that will send is carried out chnnel coding;
(2) coding result to described chnnel coding carries out interleaving treatment;
(3) coded message after the described interleaving treatment is carried out constellation mapping, the structure constellation is trooped;
(4) element during described constellation is trooped carry out based on sky frequently the differential west space of block interleaving modulate frequently, obtain the signal to be sent on each antenna.
In the above-mentioned sending method step (1), described chnnel coding can comprise low-density check code or Turbo coding.
In the above-mentioned sending method, described step (2) can be carried out described interleaving treatment to described coding result according to concatenated coding.
In the above-mentioned sending method, the matrix of elements V during described constellation is trooped
kAnd described constellation troop in described matrix V
kDifferent arbitrary matrix V
k', can satisfy V
k-V
k' full rank and determinant V
k-V
k' the value maximum.
Above-mentioned sending method, described step (4) can comprise:
(41) element during described constellation is trooped carries out differential west space modulating-coding frequently, obtains empty matrix frequently at the tenth of the twelve Earthly Branches;
(42) to described tenth of the twelve Earthly Branches empty matrix frequently carry out matrix and cut apart the submatrix after obtaining cutting apart;
(43) submatrix after described cutting apart is carried out the matrix interleaving treatment;
(44) symbol after the described matrix interleaving treatment is carried out the OFDM modulation, obtain the signal to be sent on described each antenna.
Further, the mode that matrix is cut apart described in the step (42) can comprise along spatial axes and cutting apart, and cut apart along frequency axis, or spatial axes, frequency axis two dimension is unified cuts apart.
Further, described step (42) can be carried out described matrix interleaving treatment according to the address of the submatrix after described cutting apart.Further, described step (42) can be carried out described matrix interleaving treatment from small to large successively according to the address of the submatrix after described cutting apart.
Compared with prior art, the present invention not only can inherit the advantage of DUSTM under slow fading channel, and can keep good systematic function under fast fading channel.In addition, the mode of interleaving treatment can be selected according to the flexible in size ground of Resource Block.
Description of drawings
Fig. 1 is the signal of apparatus of the present invention embodiment block diagram;
Fig. 2 is the differential west space block diagram signal of modulating device frequently of the empty block interleaving frequently of the present invention;
Fig. 3 is the signal of the inventive method embodiment step;
Fig. 4 is the detailed process schematic diagram of step 304 shown in Figure 3;
The principle schematic that Fig. 5 modulates frequently for differential west space;
Fig. 6 is the more concrete steps flow chart schematic diagram of the inventive method one.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
At first structure of the present invention is briefly described, we encode as the chnnel coding of this MIMO-OFDM system with low-density check (LDPC) coding or Turbo.Consideration for coding cascade thought, the LDPC sign indicating number is thought outer coding, differential west space is modulated (DUSFM) frequently think interior coding, help making by Design of Interleaver that coding can make full use of external information in receiving terminal when decoding like this and obtain better concatenated coding gain based on the space-frequency coding that interweaves.
Please refer to Fig. 1, be the schematic diagram of apparatus of the present invention embodiment, apparatus of the present invention mainly also comprise except many transmitting antennas 11:
Constellation mapping module 103 is used for the coded message after the interleaving treatment is carried out constellation mapping, the structure constellation Ω that troops;
Based on sky frequently the differential west space of block interleaving modulate (I-DUSFM) device 104 frequently, be used for to constellation troop the element of Ω carry out based on sky frequently the differential west space of block interleaving modulate frequently, what obtain is signal to be sent on each antenna.
Above-mentioned I-DUSFM device 104, its structure comprise on function as shown in Figure 2:
Cut apart module 202, be used for gained empty matrix X frequently at the tenth of the twelve Earthly Branches
kCarry out matrix and cut apart, the submatrix after obtaining cutting apart;
Submatrix interleaver 203 is used for the submatrix after cutting apart is carried out the matrix interleaving treatment;
OFDM modulator 204 links to each other with many transmitting antennas 11, and antenna is used for the symbol after the matrix interleaving treatment is carried out the OFDM modulation, obtains the signal to be sent on each antenna.
The partitioning scheme of cutting apart module 202 can be divided into along spatial axes and cutting apart, and cut apart along frequency axis, and spatial axes, frequency axis two dimension is unified cuts apart.
Fig. 3 shows the schematic diagram of the inventive method embodiment, and in conjunction with apparatus of the present invention embodiment shown in Figure 1, the key step of the inventive method is as follows:
Step 301 is carried out chnnel coding to the bit information that will send, and coding result is exported to external interleaver;
Step 302 designs external interleaver according to the mentality of designing of cascaded code, determines mode and scale that it interweaves, and coding result is carried out interleaving treatment;
Step 303 is carried out constellation mapping to the coded message after interweaving, the structure constellation Ω that troops;
In the above-mentioned steps 301, bit information being carried out chnnel coding, can be the LDPC coding, also can be Turbo coding or the like.
Fig. 4 shows the detailed process of above-mentioned steps 304, and in conjunction with the structural representation of I-DUSFM device 104 shown in Figure 2, the concrete steps of above-mentioned steps 304 comprise:
Step 401 is with information symbol v
kBe mapped to sign matrix V
k, this matrix V
kBe the element among the constellation group Ω.In order to obtain maximum diversity gain and coding gain, the matrix V in constellation group Ω
kWith belong to constellation group Ω but be different from V
kAny matrix V
k' satisfy: matrix V
k-V
k' be full rank, and determinant V
k-V
k' value det (V
k-V
k') be maximum.Definition constellation group's dimension is L, and the principle of utilizing formula (1) is to the element V among the constellation group Ω
kCarry out differential west space and modulate frequently, specifically be expressed as follows formula:
X
k=V
kX
K-1Formula (2)
X wherein
0=I
M, I
MBe the unit matrix of M1 * M1, M1 is a number of transmit antennas, carries out differential modulation according to formula (2), can get empty matrix X frequently at the tenth of the twelve Earthly Branches
k(k=1 ... K, K are the subcarrier number of Resource Block).X
kThe signal that on different sub carrier on m the transmitting antenna, sends of m line display.
Step 402 is to gained empty matrix X frequently at the tenth of the twelve Earthly Branches
kCarry out matrix and cut apart, the method for cutting apart can adopt following several:
1) cut apart along spatial axes:
Along sky frequently the spatial axes of matrix with X
kBe divided into M1 submatrix, each submatrix dimension is M1 * 1, for simplicity, these matrixes is labeled as X (0) according to time sequencing, X (1) ..., X (M1) is by to the individual empty matrix X frequently of matrix (Ns+1)
k(k=0 ..., Ns) make as above dividing processing successively, obtain N
Sub=K * (N
s+ 1) individual dimension is the submatrix of M1 * 1.
2) cut apart along frequency axis:
Along sky frequently the frequency axis of matrix with X
kBe divided into K submatrix, each submatrix dimension is 1 * K, for simplicity, these matrixes is labeled as X (0) according to time sequencing, X (1) ..., X (K) is by to (N
s+ 1) individual empty matrix X frequently
k(k=0 ..., Ns) make as above dividing processing successively, obtain N
Sub=M1 * (N
s+ 1) individual dimension is the submatrix of 1 * K.
3) spatial axes, the unification of frequency axis two dimension are cut apart:
The spatial axes of the empty matrix frequently in edge is with X
kBe divided into that (M1 * K)/(M1 ' * K ') individual submatrix, each submatrix dimension is M1 ' * K ', M1 '≤M1 wherein, K '≤K.By to (N
s+ 1) individual empty matrix X frequently
k(K=0,1 ..., N
s, N
sNumber for information matrix among the constellation group) makes as above dividing processing successively, obtain N
Sub=(M1 * K)/(M1 ' * K ') * (N
s+ 1) individual dimension is the submatrix of M1 ' * K '.
Wherein
Round under the expression.
S
k=[X (0), X (1) ..., X (MM-1)] formula (4)
Wherein,
Matrix S
kThe m (line display of the m≤M1) signal that different sub carrier sends on m transmitting antenna.
Fig. 5 shows above-mentioned steps 401 and carries out the principle that differential west space is modulated frequently, at first signal is carried out modulating (USFM) based on the empty frequency of unitary matrix, then according to information matrix V
kAnd in the frequency domain frequency displacement the empty matrix X frequently at the tenth of the twelve Earthly Branches of a unit
K-1, can get empty matrix X frequently at the current tenth of the twelve Earthly Branches
kThe differential coding result, i.e. X
k=V
kX
K-1
Provide a more concrete embodiment flow process of the inventive method below, as shown in Figure 6, comprise step:
Step 601 is carried out the LDPC chnnel coding to the bit information that will send, and its coding result is exported to external interleaver;
Step 602 designs external interleaver according to the mentality of designing of cascaded code, determines mode and scale that it interweaves, and coding result is carried out interleaving treatment;
Step 603 is carried out constellation mapping to the coded message after interweaving, the structure constellation Ω that troops, and the element of this set will satisfy the principle of above-mentioned diversity gain and coding gain;
Step 605 is cut apart along spatial axes the matrix of encoding frequently through differential west space;
Step 606 adopts method shown in the formula (3) to carry out interleaving treatment to cutting apart good submatrix;
The present invention is in the differential west space frequency modulating system, at first information symbol is mapped to constellation when empty at the tenth of the twelve Earthly Branches, pass through differential modulation then, generate empty matrix frequently, then these empty matrixes frequently are divided into the plurality of sub matrix along frequency or space (antenna) axle, modulation sends on the corresponding transmitting antenna through OFDM after at last these submatrixs being carried out interleaving treatment.
The present invention is in conjunction with the outer sign indicating number of chnnel codings such as LDPC or Turbo conduct, space-frequency coding is as ISN, and many antenna transmission scheme that the multi-input multi-output orthogonal frequency division multiplexing system that proposes is modulated frequently based on the differential west space of sky frequency block interleaving, not only can resist the situation of the Fast Channel decline in the multiaerial system, keep good systematic function, and I-DUSFM need not channel condition information and still can obtain to send full diversity under slow fading channel.In addition, the mode of the empty interleaving treatment frequently of the present invention can be selected to divide along frequency axis along the spatial axes division according to the flexible in size ground of Resource Block, and perhaps empty, two dimension unification is frequently divided and stepped on three kinds of dividing mode, and its performance obviously is better than traditional DUSTM system.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (14)
1. the dispensing device of a multi-input multi-output orthogonal frequency division multiplexing system is characterized in that, comprising:
Encoder is used for the information that will send is carried out chnnel coding;
External interleaver is used for the coding result of described chnnel coding is carried out interleaving treatment;
The constellation mapping module is used for the coded message after the described interleaving treatment is carried out constellation mapping, and the structure constellation is trooped;
Based on the differential west space frequency modulator of sky frequency block interleaving, the element that is used for that described constellation is trooped carries out modulating frequently based on the differential west space of sky frequency block interleaving, obtains the signal to be sent on each antenna;
Wherein, described differential west space frequency modulator based on sky frequency block interleaving comprises:
Inner encoder, the element that is used for that described constellation is trooped carry out differential west space modulating-coding frequently, obtain empty matrix frequently at the tenth of the twelve Earthly Branches;
Cut apart module, be used for to described tenth of the twelve Earthly Branches empty matrix frequently carry out matrix and cut apart the submatrix after obtaining cutting apart;
The submatrix interleaver is used for the submatrix after described cutting apart is carried out the matrix interleaving treatment;
Orthogonal frequency division multiplexing modulator is used for the symbol after the described matrix interleaving treatment is carried out the OFDM modulation, obtains the signal to be sent on described each antenna.
2. dispensing device as claimed in claim 1 is characterized in that, the chnnel coding that described encoder carries out comprises low-density check code or Turbo coding.
3. dispensing device as claimed in claim 1 is characterized in that described external interleaver carries out described interleaving treatment according to concatenated coding to described coding result.
4. dispensing device as claimed in claim 1 is characterized in that, the described constellation of described constellation mapping module structure is trooped, its matrix of elements V
kAnd described matrix V
kTransposition V
k, satisfy V
k-V
kFull rank and determinant V
k-V
kThe value maximum.
5. dispensing device as claimed in claim 1 is characterized in that, the described partitioning scheme of cutting apart module comprises along spatial axes and cutting apart, and cut apart along frequency axis, or spatial axes, frequency axis two dimension is unified cuts apart.
6. dispensing device as claimed in claim 1 is characterized in that, described interleaving treatment is carried out in the address of the submatrix of described submatrix interleaver after according to described cutting apart.
7. dispensing device as claimed in claim 6 is characterized in that, the address of the submatrix of described submatrix interleaver after according to described cutting apart is carried out described interleaving treatment from small to large successively.
8. the sending method of a multi-input multi-output orthogonal frequency division multiplexing system is characterized in that, comprising:
(1) information that will send is carried out chnnel coding;
(2) coding result to described chnnel coding carries out interleaving treatment;
(3) coded message after the described interleaving treatment is carried out constellation mapping, the structure constellation is trooped;
(4) element during described constellation is trooped carry out based on sky frequently the differential west space of block interleaving modulate frequently, obtain the signal to be sent on each antenna;
Described step (4) comprising:
(41) element during described constellation is trooped carries out differential west space modulating-coding frequently, obtains empty matrix frequently at the tenth of the twelve Earthly Branches;
(42) to described tenth of the twelve Earthly Branches empty matrix frequently carry out matrix and cut apart the submatrix after obtaining cutting apart;
(43) submatrix after described cutting apart is carried out the matrix interleaving treatment;
(44) symbol after the described matrix interleaving treatment is carried out the OFDM modulation, obtain the signal to be sent on described each antenna.
9. sending method as claimed in claim 8 is characterized in that, chnnel coding described in the step (1) comprises low-density check code or Turbo coding.
10. sending method as claimed in claim 8 is characterized in that, described step (2) is carried out described interleaving treatment according to concatenated coding to described coding result.
11. sending method as claimed in claim 8 is characterized in that, the matrix of elements V during described constellation is trooped
kAnd described constellation troop in described matrix V
kDifferent arbitrary matrix V
k, satisfy V
k-V
kFull rank and determinant V
k-V
kThe value maximum.
12. sending method as claimed in claim 8 is characterized in that, the mode that matrix is cut apart described in the step (42) comprises along spatial axes and cutting apart, and cut apart along frequency axis, or spatial axes, frequency axis two dimension is unified cuts apart.
13. sending method as claimed in claim 8 is characterized in that, described matrix interleaving treatment is carried out in the address of the submatrix of described step (42) after according to described cutting apart.
14. sending method as claimed in claim 13 is characterized in that, the address of the submatrix of described step (42) after according to described cutting apart is carried out described matrix interleaving treatment from small to large successively.
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| CN101567717B (en) * | 2009-04-23 | 2012-11-07 | 北京交通大学 | Uplink MIMO-LDPC modulation and demodulation system |
| CN102075487B (en) * | 2009-11-25 | 2013-02-27 | 清华大学 | Multidimensional constellation mapping based coding and modulating method, demodulating and decoding method and system |
| CN102244556B (en) * | 2010-05-11 | 2014-01-22 | 清华大学 | Construction method of multi-dimensional constellation graph, and method and system for code modulation and demodulation and decoding |
| CN102142928B (en) * | 2010-11-19 | 2013-11-06 | 华为技术有限公司 | Methods for interleaving and deinterleaving external code coding output codons and interleaving and deinterleaving devices |
| CN102790747B (en) * | 2012-08-09 | 2015-01-07 | 电子科技大学 | Mapping method for spacial modulation system |
| CN105323012B (en) * | 2014-07-14 | 2019-07-02 | 宏碁股份有限公司 | Voice data transmission system and sound data transmission method |
| CN104519003B (en) * | 2014-12-17 | 2018-04-17 | 深圳清华大学研究院 | The multi-dimensional constellation diagram construction method of orthogonal signalling |
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| CN1294714C (en) * | 2004-07-15 | 2007-01-10 | 上海交通大学 | Star dividing difference time spaced modulation and demodulation method for quick fading channel |
| CN1918839A (en) * | 2003-12-17 | 2007-02-21 | 高通股份有限公司 | Spatial spreading in a multi-antenna communication system |
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| CN1294714C (en) * | 2004-07-15 | 2007-01-10 | 上海交通大学 | Star dividing difference time spaced modulation and demodulation method for quick fading channel |
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