CN101997808A - Method and device for grouping subcarriers for wireless communication system - Google Patents
Method and device for grouping subcarriers for wireless communication system Download PDFInfo
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- CN101997808A CN101997808A CN2009101658968A CN200910165896A CN101997808A CN 101997808 A CN101997808 A CN 101997808A CN 2009101658968 A CN2009101658968 A CN 2009101658968A CN 200910165896 A CN200910165896 A CN 200910165896A CN 101997808 A CN101997808 A CN 101997808A
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Abstract
The invention discloses a method and a device for grouping subcarriers for a wireless communication system, wherein the wireless communication system comprises a plurality of subcarriers; the subcarrier grouping method comprises the steps of: judging a coherence bandwidth of the plurality of subcarriers, and dividing the plurality of subcarriers into a plurality of subcarrier groups according to the coherence bandwidth, wherein each subcarrier group is less than or equal to the coherence bandwidth.
Description
Technical field
The present invention relates to a kind of subcarrier group technology and device that is used for a wireless telecommunication system, particularly relate to a kind of sub-carrier group size is made as and be less than or equal to people having the same aspiration and interest frequency range, the subcarrier group technology and the device that make the subcarrier in the same sub-carrier group have higher relevance.
Background technology
Orthogonal frequency multiple access (Orthogonal Frequency Division Multiple Access, OFDMA) technology is a kind of with Orthodoxy Frequency Division Multiplex (Orthogonal Frequency Division Multiplexing, OFDM) technology is the technology of the multiple access on basis, it can provide more multichannel and more services under same frequency spectrum.Therefore, all support the OFDMA technology as WiMAX (Worldwide Interoperability for Microwave Access), LTE wireless telecommunication systems such as (Long-Term Evolution).
Specifically, the OFDM technology is " multi-carrier modulation " (Multi Carrier Modulation, MCM) transmission method is a kind of, its basic notion is the data streaming of a high-speed transfer speed, cut into many parallelly and, and each time crossfire is modulated on the different subcarrier (Subcarrier) than the transmission rate crossfire of low speed.In this case, the time of code element (Symbol) the enough length that becomes, the just sub-fraction of symbol time so the delay that passage causes becomes, thereby can eliminate or reduce inter symbol interference (Inter Symbol Interference), effectively promote the availability of frequency spectrum (spectrum efficiency), increase the volume of transmitted data of system.And the OFDM technology cooperates different multiple access modes, as FDMA (Frequency Division Multiple Access), TDMA (Time Division Multiple Access) and CDMA (Code Division Multiple Access), the OFDM technology can be accessed wireless system from fixed point and expand to cellular system with locomotivity.
The OFDMA technology is the abbreviation of OFDM/FDMA, and it is that subcarrier with the OFDM gained further is divided into several sub-carrier group again, can be called " subchannel " (Subchannel) again.Therefore, in the OFDMA system, when secondary channel is the base station assigns resource, minimum frequency resource unit, and different subchannels may be distributed to different user (or customer group), the user also can the selective channel condition preferably secondary channel carry out transfer of data.
In the prior art, subchannel generally is made up of in succession subcarrier in the operational frequency bands, and the size of subchannel, the subcarrier quantity that promptly subchannel comprised then adopts at random or the fixed size mode determines.For example, if subcarrier quantity is 256, then prior art can be set at a subchannel with per 8 subcarriers successively, totally 32 subchannels.Such mode is only merely divided into groups to all subcarriers according to the systemic presupposition rule, and does not consider channel characteristic, transmission environment etc., may cause efficiency of transmission to reduce.
Summary of the invention
Therefore, main purpose of the present invention promptly is to provide a kind of subcarrier group technology and device.
The present invention discloses a kind of subcarrier group technology that is used for a wireless telecommunication system, and this wireless telecommunication system comprises a plurality of subcarriers, and it is wide that this subcarrier group technology includes the together frequency modulation of judging these a plurality of subcarriers; And, should be divided into a plurality of sub-carrier group by a plurality of subcarriers according to this people having the same aspiration and interest frequency range, the size of each sub-carrier group is less than or equal to this people having the same aspiration and interest frequency range.
The present invention also discloses a kind of device that is used for a wireless telecommunication system, is used for carrying out aforesaid subcarrier group technology, is divided into a plurality of sub-carrier group with a plurality of subcarriers with this wireless telecommunication system.
The present invention also discloses a kind of transmission method that is used for a wireless telecommunication system, includes a plurality of subcarriers that detect this wireless telecommunication system; The together frequency modulation of judging these a plurality of subcarriers is wide; According to this people having the same aspiration and interest frequency range, should be divided into a plurality of sub-carrier group by a plurality of subcarriers, the size of each sub-carrier group is less than or equal to this people having the same aspiration and interest frequency range; And primary carrier group allocation that will these a plurality of sub-carrier group gives a user, in order to transfer data to this user.
The present invention also discloses a kind of device that is used for a wireless telecommunication system, is used for carrying out aforesaid transmission method, to transfer data to a user.
Description of drawings
Fig. 1 is the schematic diagram of embodiment of the invention primary carrier grouping flow process.
Fig. 2 is the schematic diagram of another subcarrier grouping flow process of the embodiment of the invention.
The reference numeral explanation
10,20 subcarriers grouping flow process
100,102,104,106,200,202,204,206,208,210 steps
Embodiment
At the packet mode of subcarrier in the wireless telecommunication system, the present invention determines the size of each sub-carrier group, i.e. the subchannel size according to frequency modulation wide (Coherent Bandwidth) together.At first, the multi-path transmission can cause each radio-frequency component in the transmission channel to suffer in various degree decay, and when the attenuation degree that is suffered between near by frequency had bigger correlation, this scope promptly was defined as people having the same aspiration and interest frequency range.That is to say that each frequency content within people having the same aspiration and interest frequency range all has the gain and the linear phase shift of identical (or close).Therefore, for the OFDMA system, any two subcarriers within people having the same aspiration and interest frequency range can be subjected to identical channelling effect, make characteristic such as its amplitude that very high relevance be arranged, and at the outer subcarrier of people having the same aspiration and interest frequency range, the channelling effect that is suffered is then greatly different.In this case, the present invention is that the width of setting subchannel should be less than or equal to people having the same aspiration and interest frequency range, makes the subcarrier in the same subchannel be subjected to identical channelling effect, is beneficial to wave beam and forms application such as (Beamforming).
Above-mentioned packet mode can reduce primary carrier grouping flow process 10, as shown in Figure 1.Subcarrier grouping flow process 10 is used for a wireless telecommunication system a plurality of subcarriers is divided into groups, and it comprises following steps:
Step 100: beginning.
Step 102: the together frequency modulation of judging these a plurality of subcarriers is wide.
Step 104: according to this people having the same aspiration and interest frequency range, should be divided into a plurality of sub-carrier group by a plurality of subcarriers, the size of each sub-carrier group is less than or equal to this people having the same aspiration and interest frequency range.
Step 106: finish.
By subcarrier grouping flow process 10, the present invention judges earlier more a plurality of subcarriers are divided into a plurality of sub-carrier group, and the size of each sub-carrier group to be less than or equal to people having the same aspiration and interest frequency range by people having the same aspiration and interest frequency range.Thus, the subcarrier in the same sub-carrier group can be subjected to identical channel effect, makes system can correctly judge the conditioned disjunction state of each sub-carrier group, with effective Resources allocation.
In simple terms, the present invention is made as the size of sub-carrier group (being the subchannel size) to be less than or equal to people having the same aspiration and interest frequency range, makes the subcarrier in the same subchannel have higher relevance.Be noted that the definition of people having the same aspiration and interest frequency range or judgment mode should be those skilled in the art to be known, and is not limited to specific flow process or step, illustrates as follows.
As previously mentioned, in the OFDMA system, the subcarrier within the people having the same aspiration and interest frequency range has very high relevance, therefore can calculate by this corresponding to primary carrier friendship correlation function (Cross-Correlation) at interval, and it can be represented by following formula:
Wherein, C represents to hand over correlation function, and h (k) represents k subcarrier after all subcarriers are according to the big minispread of frequency, and D represents the subcarrier spacing value, and * represents conjugate complex number.
Subcarrier spacing value D preestablishes, and is an integer, after having set subcarrier spacing value D, can calculate and hand over correlation function C.Then, will hand over a correlation function C and a predetermined threshold value TH relatively.If hand over correlation function C less than threshold value TH, be illustrated under the subcarrier spacing value D that sets, the correlation between subcarrier should reset subcarrier spacing value D less than default value.Otherwise, if hand over correlation function C, being illustrated under the subcarrier spacing value D that sets more than or equal to threshold value TH, the correlation between subcarrier is higher than default value, and in other words, the subcarrier in the scope of subcarrier spacing value D is in people having the same aspiration and interest frequency range.In view of the above, can judge people having the same aspiration and interest frequency range by following formula:
BW_CR 〉=BW_SCR * D, (formula 2)
Wherein, BW_CR represents people having the same aspiration and interest frequency range, and BW_SCR represents the subcarrier width.
Because the present invention is the size (subchannel size) with sub-carrier group to be made as and to be less than or equal to people having the same aspiration and interest frequency range, therefore, according to formula 2, the subchannel size can be made as the product of subcarrier width B W_SCR and subcarrier spacing value D, with requirement according to the invention, that is:
BW_SCH=BW_SCR * D, (formula 3)
Wherein, BW_SCH represents the subchannel size.
By above-mentioned function mode, subcarrier grouping flow process 10 can be derived and is primary carrier grouping flow process 20, as shown in Figure 2.Subcarrier grouping flow process 20 comprises following steps:
Step 200: beginning.
Step 202: set subcarrier spacing value D.
Step 204: calculate
Step 206: judge that whether C is greater than threshold value TH.If carry out step 208; If not, get back to step 202, to reset subcarrier spacing value D.
Step 208: setting subchannel size BW_SCH is the product of subcarrier width B W_SCR and subcarrier spacing value D.
Step 210: finish.
Therefore, by subcarrier grouping flow process 20, secondary channel size BW_SCH can make the subcarrier of same subchannel have higher relevance less than people having the same aspiration and interest frequency range, and the conditioned disjunction state of each subchannel can correctly be judged by system, with effective distributing radio resource.
Be noted that subcarrier grouping flow process 10 or 20 is used for the size of OFDMA system decision sub-carrier group, when practical application, can realize by modes such as software, firmware, hardware, all subcarriers are divided into the group of suitable size.
In the prior art, system adopts at random or the fixed size mode determines the subchannel size, does not consider characteristics such as channel characteristic, transmission environment.In comparison, the present invention considers the subcarrier characteristic, the width of subchannel is made as is less than or equal to people having the same aspiration and interest frequency range, subcarrier in the then same subchannel is subjected to identical channel effect, make system can correctly judge the conditioned disjunction state of each subchannel, with effective Resources allocation, help wave beam simultaneously and form application such as (Beamforming).
On the other hand, the OFDMA technology has been used in many wireless telecommunication systems, therefore, when realizing that subcarrier of the present invention divides into groups flow process, should suitably adjust function mode according to pairing wireless telecommunication system.For instance, if be applied to meet in the wireless telecommunication system of IEEE 802.11 standards, at first, channel estimating (Channel Estimation) should be carried out in the base station, to judge the people having the same aspiration and interest frequency range of subcarrier state and subcarrier.Then, according to people having the same aspiration and interest frequency range, all subcarriers are divided into a plurality of sub-carrier group, each sub-carrier group i.e. a subchannel, and its size (the subcarrier quantity that subchannel comprised) should be less than or equal to people having the same aspiration and interest frequency range.At last, the base station is unit with the secondary channel, allocation of transmission resources.In this case, the base station is carried out the required complexity of resource allocation and can significantly be reduced.For example, if subcarrier quantity is 256, and people having the same aspiration and interest frequency range is 16 subcarrier width, and the subcarrier quantity that then subchannel comprised is 16, therefore, needs to carry out resource allocation at 256 subcarriers originally and can be reduced to 16 subchannels.The more important thing is, because the present invention is the grouping of carrying out subcarrier according to people having the same aspiration and interest frequency range, make that the channelling effect that subcarrier suffered in the same subchannel is all close, then the transmission conditions of each subchannel can be assessed in the base station, and then, distribute suitable subchannel according to the demand of user's (or customer group).
In sum, the present invention is made as sub-carrier group size (being the subchannel size) and is less than or equal to people having the same aspiration and interest frequency range, makes the subcarrier in the same sub-carrier group have higher relevance.
The above only is preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (12)
1. subcarrier group technology that is used for a wireless telecommunication system, this wireless telecommunication system comprises a plurality of subcarriers, and this subcarrier group technology includes:
The together frequency modulation of judging these a plurality of subcarriers is wide; And
According to this people having the same aspiration and interest frequency range, should be divided into a plurality of sub-carrier group by a plurality of subcarriers, the size of each sub-carrier group is less than or equal to this people having the same aspiration and interest frequency range.
2. subcarrier group technology as claimed in claim 1, wherein judge to include the step of this people having the same aspiration and interest frequency range of these a plurality of subcarriers:
Set a spacing value;
Calculate these a plurality of subcarriers and hand over correlation function corresponding to one of this spacing value; And
Relatively should hand over a correlation function and a threshold value, to judge this people having the same aspiration and interest frequency range.
3. subcarrier group technology as claimed in claim 2 is wherein calculated the step of these a plurality of subcarriers corresponding to this friendship correlation function of this spacing value, is to calculate an equation, and this equation is:
Wherein, C represents this friendship correlation function, and h (k) represents k subcarrier after these a plurality of subcarriers are according to the big minispread of frequency, and D represents this spacing value, and * represents conjugate complex number.
4. subcarrier group technology as claimed in claim 2, wherein relatively should hand over correlation function and this threshold value, to judge the step of this people having the same aspiration and interest frequency range, include in this friendship correlation function during, judge that this people having the same aspiration and interest frequency range is greater than the product of this spacing value with the primary carrier width of these a plurality of subcarriers greater than this threshold value.
5. subcarrier group technology as claimed in claim 1, wherein this wireless telecommunication system adopts orthogonal frequency multiple access technology.
6. a device that is used for a wireless telecommunication system is used for carrying out subcarrier group technology as claimed in claim 1, is divided into a plurality of sub-carrier group with a plurality of subcarriers with this wireless telecommunication system.
7. transmission method that is used for a wireless telecommunication system includes:
Detect a plurality of subcarriers of this wireless telecommunication system;
The together frequency modulation of judging these a plurality of subcarriers is wide;
According to this people having the same aspiration and interest frequency range, should be divided into a plurality of sub-carrier group by a plurality of subcarriers, the size of each sub-carrier group is less than or equal to this people having the same aspiration and interest frequency range; And
Give a user with the primary carrier group allocation of these a plurality of sub-carrier group, in order to transfer data to this user.
8. transmission method as claimed in claim 7, wherein judge to include the step of this people having the same aspiration and interest frequency range of these a plurality of subcarriers:
Set a spacing value;
Calculate these a plurality of subcarriers and hand over correlation function corresponding to one of this spacing value; And
Relatively should hand over a correlation function and a threshold value, to judge this people having the same aspiration and interest frequency range.
9. transmission method as claimed in claim 8 wherein calculates the step of these a plurality of subcarriers corresponding to this friendship correlation function of this spacing value, is to calculate an equation, and this equation is:
Wherein, C represents this friendship correlation function, and h (k) represents k subcarrier after these a plurality of subcarriers are according to the big minispread of frequency, and D represents this spacing value, and * represents conjugate complex number.
10. transmission method as claimed in claim 8, wherein relatively should hand over correlation function and this threshold value, to judge the step of this people having the same aspiration and interest frequency range, include in this friendship correlation function during greater than this threshold value, judge that this people having the same aspiration and interest frequency range is greater than the product of this spacing value with the primary carrier width of these a plurality of subcarriers.
11. transmission method as claimed in claim 7, wherein this wireless telecommunication system adopts orthogonal frequency multiple access technology.
12. a device that is used for a wireless telecommunication system is used for carrying out transmission method as claimed in claim 7, to transfer data to a user.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016127428A1 (en) * | 2015-02-15 | 2016-08-18 | 华为技术有限公司 | Carrier management method and system, base station and user equipment |
| CN109314561A (en) * | 2016-06-15 | 2019-02-05 | 高通股份有限公司 | Wave beam report and scheduling in multicarrier beamforming communication |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1518803A (en) * | 2001-04-19 | 2004-08-04 | ��ϵͳ��ƹ�˾ | Method for multiple access and transmission in point-to-multipoint system on electrical network |
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- 2009-08-12 CN CN2009101658968A patent/CN101997808A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1518803A (en) * | 2001-04-19 | 2004-08-04 | ��ϵͳ��ƹ�˾ | Method for multiple access and transmission in point-to-multipoint system on electrical network |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016127428A1 (en) * | 2015-02-15 | 2016-08-18 | 华为技术有限公司 | Carrier management method and system, base station and user equipment |
| CN109314561A (en) * | 2016-06-15 | 2019-02-05 | 高通股份有限公司 | Wave beam report and scheduling in multicarrier beamforming communication |
| CN109314561B (en) * | 2016-06-15 | 2022-02-08 | 高通股份有限公司 | Beam reporting and scheduling in multicarrier beamforming communications |
| US11665568B2 (en) | 2016-06-15 | 2023-05-30 | Qualcomm Incorporated | Beam reporting and scheduling in multicarrier beamformed communications |
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Application publication date: 20110330 |