CN101616113B - Transmitting method based on sub-band and device thereof - Google Patents
Transmitting method based on sub-band and device thereof Download PDFInfo
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- CN101616113B CN101616113B CN2008100435402A CN200810043540A CN101616113B CN 101616113 B CN101616113 B CN 101616113B CN 2008100435402 A CN2008100435402 A CN 2008100435402A CN 200810043540 A CN200810043540 A CN 200810043540A CN 101616113 B CN101616113 B CN 101616113B
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Abstract
The invention relates to the field of wireless communication, and discloses a transmitting method based on a sub-band and a device thereof. Under the condition that the CP length needs to be changed, by correspondingly expanding the lengths of DFT and IFFT and changing the partial length of transmission symbol data, the method and the device can keep transmission properties such as carrier recovery, timing recovery and the like except Doppler effect unchangeable at the same time of keeping the spectrum efficiency stable. A system can have one sub-band or a plurality of sub-bands. By distributing one data stream into the plurality of sub-bands to be transmitted, the method and the device have good power peak-to-average ratio and frequency domain selective interference resistance.
Description
Technical field
The present invention relates to wireless communication field, particularly based on the transmission technology of subband.
Background technology
At present; Typically the transmission means based on subband has the single-carrier frequency division multiple access based on single carrier (being the list band) to insert (Single Carrier-Frequency Division Multiple Access; Be called for short " SC-FDMA ") transmission means, the frequency domain implementation method schematic diagram that its signal generates is as shown in Figure 1.In Fig. 1 (a); N coding back data symbol at first passes through DFT (DiscreteFourier Transformation is called for short " DFT ") spread spectrum, is mapped to reverse FFT (Inverse Fast Transform through the subcarrier map unit then; Abbreviation " IFFT ") assigned address of frequency domain; Generate time-domain signal through IFFT, insert Cyclic Prefix (Cyclic Prefix is called for short " CP ") back output at last.Fig. 1 (b) has provided the concrete implementation of subcarrier mapping.
OFDM for based on a plurality of subbands inserts (multi band OrthogonalFrequency Division Multiple Access; Abbreviation " MB-OFDMA ") the frequency domain implementation method of signal generation; Its principle is as shown in Figure 2; Suppose to have the subband of M equiband, transmit N symbol on each subband.At first, M * N the coding after data symbol be divided into M data flow through the data symbol stream branching unit, each data flow contains N data symbol.N on each data flow data symbol is mapped to the assigned address on the IFFT frequency domain after through the DFT spread spectrum.At last, these frequency domain subband signals transform to time domain through IFFT, have just generated the orthogonal frequency division multiplexing multiple access signal of a plurality of subbands behind the insertion CP.
Inventor of the present invention finds that the existing wireless communications transmission technology is based on OFDM (Orthogonal Frequency Division Multiplexing is called for short " OFDM ") scheme, and each OFDM symbol is made up of Cyclic Prefix and data division; In order to keep higher spectrum efficiency, circulating prefix-length generally is certain fixed proportion of data division length, such as 1/4,1/32 etc.The processing method of ofdm signal can be 7,388,921 United States Patent (USP) referring to the patent No..
In order to adapt to the propagation scene of different multipath conditions, need CP adjustment to some extent according to circumstances; When CP length is longer, hope that data symbol length also can be and then elongated, keep spectrum efficiency constant basically.In existing OFDM technology, can change data symbol length through the reindexing subcarrier spacing, still; This scheme makes the transmission characteristic of signal that change also take place; Such as having changed the carrier track characteristic, regularly synchronizing characteristics is resisted characteristic of Doppler frequency shift or the like.
Summary of the invention
The object of the present invention is to provide a kind of launching technique and equipment thereof based on subband, can be when keeping spectrum efficiency stable, the transmission characteristic that can also keep except that Doppler's effect is constant.
For solving the problems of the technologies described above, execution mode of the present invention provides a kind of launching technique based on subband, may further comprise the steps:
Confirm the ratio B of current sub symbol data partial-length with respect to benchmark subband symbol data partial-length, wherein each subband symbol is made up of Cyclic Prefix part and data division;
B * N data are carried out the DFT that length is B * N, and wherein N is a benchmark subband symbol data partial-length;
Through the subcarrier mapping DFT result is mapped to subband corresponding in the total bandwidth that width is B * W, wherein W is the sub-carrier number of benchmark subband sign map to total bandwidth;
Mapping result is carried out the reverse FFT generation time-domain signal that length is B * W, launch behind the insertion Cyclic Prefix.
Execution mode of the present invention also provides a kind of transmitter based on subband, comprising:
Control unit is used for confirming the ratio B of current sub symbol data partial-length with respect to benchmark subband symbol data partial-length, and wherein each subband symbol is made up of Cyclic Prefix part and data division;
The DFT unit is used for B * N data are carried out the DFT that length is B * N, and wherein N is a benchmark subband symbol data partial-length;
Map unit is used for being mapped to the corresponding subband of total bandwidth that width is B * W through the DFT result that the DFT unit is exported in the subcarrier mapping, and wherein W is the sub-carrier number of benchmark subband sign map to total bandwidth;
The IFFT unit is used for the mapping result of map unit output is carried out the reverse FFT generation time-domain signal that length is B * W;
CP inserts the unit, and the time-domain signal that is used for the output in I FFT unit inserts Cyclic Prefix;
Transmitter unit is used to launch the signal that inserts cell processing through CP.
Embodiment of the present invention compared with prior art, the main distinction and effect thereof are:
Change at needs under the situation of CP length; Correspondingly expand the length of DFT and IFFT; Change transmission symbol data division length, thereby when keeping spectrum efficiency stable, it is constant to keep the transmission characteristics except that Doppler's effect such as carrier wave recovers, timing recovery.
Further, through a data flow point is transmitted, can have power peak-to-average force ratio and anti-frequency domain selectivity jamming performance preferably simultaneously in a plurality of subbands.
Further, the bandwidth of each subband can be identical, and the data that the mode of employing five equilibrium will belong to same data flow are divided into multichannel; Can simplify shunt operation; Because when the corresponding data of each subband were carried out DFT, the length of DFT was identical, the simplification of handling for DFT provides possibility.
Further, the bandwidth of each subband bandwidth also can be different, and the speed of the bandwidth of each subband and its data carried by data stream is corresponding, thereby improve the utilance of resource.
Further, the protection isolation bandwidth is set between each subband, can reduces the phase mutual interference between each subband.
Further, the value as B * N is 2
N13
N25
N3, and the value of B * W is 2
N43
N55
N6The time, DFT and IFFT can be carried out efficiently.
Description of drawings
Fig. 1 is the frequency domain implementation method schematic diagram that the SC-FDMA single-carrier signal generates in the prior art;
Fig. 2 is the frequency domain implementation method schematic diagram that generates based on the orthogonal frequency division multiplexing multiple access signal of a plurality of subbands in the prior art;
Fig. 3 is the launching technique flow chart based on subband according to first embodiment of the invention;
Fig. 4 is the launching technique sketch map based on subband according to first embodiment of the invention;
Fig. 5 is the launching technique flow chart based on subband according to second embodiment of the invention;
Fig. 6 is the launching technique sketch map based on subband according to second embodiment of the invention;
Fig. 7 is the transmitter structure chart based on subband according to four embodiment of the invention.
Embodiment
In following narration, many ins and outs have been proposed in order to make the reader understand the application better.But, persons of ordinary skill in the art may appreciate that even without these ins and outs with based on the many variations and the modification of following each execution mode, also can realize each claim of the application technical scheme required for protection.
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that execution mode of the present invention is done to describe in detail further below.
First embodiment of the invention relates to a kind of launching technique based on subband, and idiographic flow is as shown in Figure 3.
In step 310, confirm the ratio B of current sub symbol data partial-length with respect to benchmark subband symbol data partial-length, wherein each subband symbol is made up of CP part and data division.Such as; Ratio according to the CP partial-length of the CP partial-length of current sub symbol and benchmark subband symbol gets access to B, and B can be the positive number greater than 1, also can be the positive number less than 1; When being expanded like the data symbol lengths; B is the positive number greater than 1, and when data symbol length was shortened, B was the positive number less than 1.
In addition; Be appreciated that B also can be not equal to the CP partial-length of current sub symbol and the ratio of the CP partial-length of benchmark subband symbol, that is to say that the ratio of data division length and CP length in different can be different; For example the length variations scope of multipath is less when indoor; CP can be in whole subband symbol the less ratio of accounting, the length variations scope of multipath is bigger when outdoor, CP can be in whole subband symbol the bigger ratio of accounting.
Then, in step 320, B * N data are carried out the DFT conversion that length is B * N, wherein N is a benchmark subband symbol data partial-length.Such as the data division length of current sub symbol is then carried out the DFT that length is 2 * N to the data symbol behind 2 * N the coding with respect to the ratio B=2 of the data division length of benchmark subband symbol.
Then, in step 330, through the subcarrier mapping DFT transformation results is mapped to subband corresponding in the total bandwidth that width is B * W, wherein W is the sub-carrier number of benchmark subband sign map to total bandwidth.Need to prove to have only a subband in the total bandwidth of this execution mode, therefore in this step, will be mapped to through the transformation results of DFT on the subband corresponding in the total bandwidth that width is B * W through the subcarrier mapping.
Then, in step 340, mapping result is carried out the IFFT generation time-domain signal that length is B * W, launch behind the insertion CP.Such as the data division length of current sub symbol is with respect to the ratio B=2 of the data division length of benchmark subband symbol, then in this step, mapping result carried out the IFFT of Double Length, generates time-domain signal, and after inserting CP, launches.Get at B under 2 the situation, the launching technique sketch map of this execution mode is as shown in Figure 4, and wherein, N symbol among Fig. 4 (a) is benchmark subband symbol data part, and Fig. 4 (b) is the frequency domain implementation method sketch map of subband symbol data partial-length after doubling.
Because in this execution mode; Change at needs under the situation of CP length; Correspondingly expand the length of DFT and IFFT; Change transmission symbol data division length, thereby when keeping spectrum efficiency stable, it is constant to keep the transmission characteristics except that Doppler's effect such as carrier wave recovers, timing recovery.
Second embodiment of the invention relates to a kind of launching technique based on subband, in this execution mode, D subband is arranged in the total bandwidth, D＞1 wherein, and idiographic flow is as shown in Figure 5.
In step 510, confirm the ratio B of current sub symbol data partial-length with respect to benchmark subband symbol data partial-length, wherein each subband symbol is made up of CP part and data division.Such as; Ratio according to the CP partial-length of the CP partial-length of current sub symbol and benchmark subband symbol gets access to B, and B can be the positive number greater than 1, also can be the positive number less than 1; When being expanded like the data symbol lengths; B is the positive number greater than 1, and when data symbol length was shortened, B was the positive number less than 1.
In addition; Be appreciated that B also can be not equal to the CP partial-length of current sub symbol and the ratio of the CP partial-length of benchmark subband symbol, that is to say that the ratio of data division length and CP length in different can be different; For example the length variations scope of multipath is less when indoor; CP can be in whole subband symbol the less ratio of accounting, the length variations scope of multipath is bigger when outdoor, CP can be in whole subband symbol the bigger ratio of accounting.
In addition, what deserves to be mentioned is that the B in this execution mode meets the following conditions:
The value of B * N is 2
N13
N25
N3, and the value of B * W is 2
N43
N55
N6, wherein, n1, n2, n3, n4, n5, n6 are nonnegative integer.DFT and IFFT can be carried out efficiently under this condition.
In step 520, the data that will belong to same data flow are divided into the D road, the respectively corresponding subband of each circuit-switched data.Wherein, the bandwidth of D subband can be identical, also can be different.If the bandwidth of D subband is identical, the data that then in this step, can adopt the mode of five equilibrium will belong to same data flow are divided into the D road.In addition, be appreciated that the bandwidth of each subband also can be inequality, will be divided into the D road with the data of same data flow this moment according to the bandwidth ratio of each subband.Through a data flow point is transmitted, can have power peak-to-average force ratio and anti-frequency domain selectivity jamming performance preferably simultaneously in a plurality of subbands.
In step 530, the D circuit-switched data is carried out DFT respectively independently.Such as benchmark subband symbol data partial-length is L, and then current sub symbol data partial-length is B * L, B * L data are divided into the D circuit-switched data after, each circuit-switched data length is B * N '.In this step, every circuit-switched data is carried out the DFT that length is B * N ' respectively, wherein N ' for benchmark subband symbol data partial-length L be divided into data length behind the D road (be N '=L/D), as shown in Figure 6.If the data of same data flow are divided into the D road according to the bandwidth ratio of each subband; Be the data of B * N ' then as far as certain road length; Carry out the DFT that length is B * N ', wherein N ' is divided into the data length on this road behind the D road for benchmark subband symbol data partial-length L.
In step 540, through the subcarrier mapping DFT transformation results is mapped to subband corresponding in the total bandwidth that width is B * W, wherein W is the sub-carrier number of benchmark subband sign map to total bandwidth, and is as shown in Figure 6.
In step 550, mapping result is carried out the IFFT generation time-domain signal that length is B * W, launch behind the insertion CP, as shown in Figure 6.
Change at needs under the situation of CP length; Correspondingly expand the length of DFT and IFFT; Change transmission symbol data division length, thereby when keeping spectrum efficiency stable, it is constant to keep the transmission characteristics except that Doppler's effect such as carrier wave recovers, timing recovery.
Because in this execution mode; The bandwidth of each subband can be identical; The data that adopt the mode of five equilibrium will belong to same data flow are divided into multichannel, can simplify shunt operation, because when the corresponding data of each subband are carried out DFT; The length of DFT is identical, and the simplification of handling for DFT provides possibility.
In addition, what deserves to be mentioned is between each subband the protection isolation bandwidth can be arranged in this execution mode, each protects isolation bandwidth identical.Owing between each subband, be provided with the protection isolation bandwidth, thereby can reduce the phase mutual interference between each subband.
In addition, be appreciated that between each subband and also can not protect isolation bandwidth that even the protection isolation bandwidth is arranged, each protects the isolation bandwidth also can be inequality.
Third embodiment of the invention relates to a kind of launching technique based on subband.This execution mode is basic identical with second execution mode, and difference mainly is:
In second execution mode, the data in each subband belong to same data flow; Yet in the 3rd execution mode, the data in each subband belong to the different data flow of same subscriber equipment.
In addition, be appreciated that different data flow can belong to different channel or different service.The bandwidth of D subband can be different, and the speed of the bandwidth of each subband and its data carried by data stream is corresponding.
Because the bandwidth of each subband can be different, and the speed of the bandwidth of each subband and its data carried by data stream is corresponding, thereby has improved the utilance of resource.
In addition, the bandwidth that is appreciated that each subband also can be identical.
Each method execution mode of the present invention can be realized with software, hardware, firmware or the like mode.No matter the present invention be with software, hardware, or the firmware mode realize; Instruction code can be stored in the memory of computer-accessible of any kind (for example permanent or revisable; Volatibility or non-volatile; Solid-state or non-solid-state, medium fixing or that change or the like).Equally; Memory can for example be programmable logic array (Programmable Array Logic; Abbreviation " PAL "), random access memory (Random Access Memory; Abbreviation " RAM "), programmable read only memory (Programmable Read Only Memory is called for short " PROM "), read-only memory (Read-Only Memory is called for short " ROM "), Electrically Erasable Read Only Memory (Electrically Erasable Programmable ROM; Abbreviation " EEPROM "), disk, CD, digital versatile disc (Digital Versatile Disc is called for short " DVD ") or the like.
Four embodiment of the invention relates to a kind of transmitter based on subband, and its structure is as shown in Figure 7, comprising:
Control unit is used for confirming the ratio B of current sub symbol data partial-length with respect to benchmark subband symbol data partial-length, and wherein each subband symbol is made up of CP part and data division.
The DFT unit is used for B * N data are carried out the DFT that length is B * N, and wherein N is a benchmark subband symbol data partial-length.
Map unit is used for being mapped to the corresponding subband of total bandwidth that width is B * W through the DFT result that the DFT unit is exported in the subcarrier mapping, and wherein W is the sub-carrier number of benchmark subband sign map to total bandwidth.
The IFFT unit is used for the mapping result of map unit output is carried out the IFFT generation time-domain signal that length is B * W.
CP inserts the unit, and the time-domain signal that is used for the output in the IFFT unit inserts CP.
Transmitter unit is used to launch the signal that inserts cell processing through CP.
Through length at DFT unit and IFFT unit extensions DFT and IFFT, can be when keeping spectrum efficiency stable, it is constant to keep the transmission characteristics except that Doppler's effect such as carrier wave recovers, timing recovery.
Wherein, control unit is confirmed B according to following formula:
B=current sub symbol CP partial-length/benchmark subband symbol CP partial-length.
In addition, be appreciated that B also can be not equal to current sub symbol CP partial-length/benchmark subband symbol CP partial-length.
First execution mode is and the corresponding method execution mode of this execution mode, this execution mode can with the enforcement of working in coordination of first execution mode.The correlation technique details of mentioning in first execution mode is still effective in this execution mode, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in this execution mode also can be applicable in first execution mode.
Fifth embodiment of the invention relates to a kind of transmitter based on subband.This execution mode is basic identical with the 4th execution mode, and difference mainly is:
In the 4th execution mode, to have only a subband in the total bandwidth, and in the 5th execution mode, D subband arranged in the total bandwidth, D＞1 wherein, DFT unit have D.
Transmitter also comprises branching unit, is used for the data that belong to same data flow are divided into the D road, outputs to D DFT unit respectively.
Second execution mode is and the corresponding method execution mode of this execution mode, this execution mode can with the enforcement of working in coordination of second execution mode.The correlation technique details of mentioning in second execution mode is still effective in this execution mode, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in this execution mode also can be applicable in second execution mode.
Need to prove; Each unit of mentioning in the present device execution mode all is a logical block, and physically, a logical block can be a physical location; It also can be the part of a physical location; Can also realize that the physics realization mode of these logical blocks itself is not most important with the combination of a plurality of physical locations, the combination of the function that these logical blocks realized is the key that just solves technical problem proposed by the invention.In addition, for outstanding innovation part of the present invention, the said equipment execution mode of the present invention will not introduced with solving the not too close unit of technical problem relation proposed by the invention, and this does not show that there is not other unit in the said equipment execution mode
Though through reference some preferred implementation of the present invention; The present invention is illustrated and describes; But those of ordinary skill in the art should be understood that and can do various changes to it in form with on the details, and without departing from the spirit and scope of the present invention.
Claims (13)
1. the launching technique based on subband is characterized in that, may further comprise the steps:
Confirm the ratio B of current sub symbol data partial-length with respect to benchmark subband symbol data partial-length, wherein each subband symbol is made up of Cyclic Prefix part and data division;
B * N data are carried out the DFT that length is B * N, and wherein N is a benchmark subband symbol data partial-length;
Through the subcarrier mapping DFT result is mapped to subband corresponding in the total bandwidth that width is B * W, wherein W is the sub-carrier number of benchmark subband sign map to total bandwidth;
Mapping result is carried out the reverse FFT generation time-domain signal that length is B * W, launch behind the insertion Cyclic Prefix.
2. the launching technique based on subband according to claim 1 is characterized in that, in the step of said definite B,
B=current sub symbol cyclic prefix partial-length/benchmark subband symbol cyclic prefix partial-length.
3. the launching technique based on subband according to claim 2 is characterized in that, has only a subband in the said total bandwidth.
4. the launching technique based on subband according to claim 2 is characterized in that, D subband is arranged, wherein D＞1 in the said total bandwidth.
5. the launching technique based on subband according to claim 4; It is characterized in that; Before said step of carrying out DFT; Also comprise the step that the data that belong to same data flow is divided into the D road, the respectively corresponding subband of each circuit-switched data carries out said DFT respectively independently.
6. the launching technique based on subband according to claim 5 is characterized in that, the bandwidth of a said D subband is identical, and the said data that will belong to same data flow are divided into and adopt the mode of five equilibrium to carry out shunt in the step on D road.
7. the launching technique based on subband according to claim 4 is characterized in that, the data in said each subband belong to the different data flow of same subscriber equipment.
8. the launching technique based on subband according to claim 7 is characterized in that, the bandwidth of a said D subband is different, and the speed of the bandwidth of each subband and its data carried by data stream is corresponding.
9. the launching technique based on subband according to claim 4 is characterized in that, between each said subband the protection isolation bandwidth is arranged, and each protects isolation bandwidth identical.
10. according to each described launching technique in the claim 1 to 9, it is characterized in that said B meets the following conditions based on subband:
The value of B * N is 2
N13
N25
N3, and the value of B * W is 2
N43
N55
N6, wherein, n1, n2, n3, n4, n5, n6 are nonnegative integer.
11. the transmitter based on subband is characterized in that, comprising:
Control unit is used for confirming the ratio B of current sub symbol data partial-length with respect to benchmark subband symbol data partial-length, and wherein each subband symbol is made up of Cyclic Prefix part and data division;
The DFT unit is used for B * N data are carried out the DFT that length is B * N, and wherein N is a benchmark subband symbol data partial-length;
Map unit is used for being mapped to the corresponding subband of total bandwidth that width is B * W through the DFT result that said DFT unit is exported in the subcarrier mapping, and wherein W is the sub-carrier number of benchmark subband sign map to total bandwidth;
The IFFT unit is used for the mapping result of said map unit output is carried out the reverse FFT generation time-domain signal that length is B * W;
CP inserts the unit, and the time-domain signal that is used for the output in said IFFT unit inserts Cyclic Prefix;
Transmitter unit is used to launch the signal that inserts cell processing through said CP.
12. the transmitter based on subband according to claim 11 is characterized in that, said control unit is confirmed B according to following formula:
B=current sub symbol cyclic prefix partial-length/benchmark subband symbol cyclic prefix partial-length.
13. the transmitter based on subband according to claim 12 is characterized in that, D subband is arranged, wherein D＞1 in the said total bandwidth;
Said DFT unit has D;
Said transmitter also comprises branching unit, is used for the data that belong to same data flow are divided into the D road, outputs to D said DFT unit respectively.
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| CN1581765A (en) * | 2003-08-14 | 2005-02-16 | 索尼国际(欧洲)股份有限公司 | Method for processing an OFDM signal |
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| CN1581765A (en) * | 2003-08-14 | 2005-02-16 | 索尼国际(欧洲)股份有限公司 | Method for processing an OFDM signal |
| CN1909534A (en) * | 2005-08-02 | 2007-02-07 | 松下电器产业株式会社 | Reconstructional OFDM system and its operation method for transmitting and receiving |
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