CN104735695A - Descrambling and despreading method for input data on terminal side and system thereof - Google Patents
Descrambling and despreading method for input data on terminal side and system thereof Download PDFInfo
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- CN104735695A CN104735695A CN201310724280.6A CN201310724280A CN104735695A CN 104735695 A CN104735695 A CN 104735695A CN 201310724280 A CN201310724280 A CN 201310724280A CN 104735695 A CN104735695 A CN 104735695A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/711—Interference-related aspects the interference being multi-path interference
- H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/711—Interference-related aspects the interference being multi-path interference
Abstract
The invention relates to the field of communication and discloses a descrambling and despreading method for input data on the terminal side and a system of the method. When the data rate of antenna data from a cell changes, deviation corresponding to the change of the data rate is performed on a scrambling code sequence of the cell, the input data on the terminal side are descrambled according to the deviated scrambling code sequence of the cell, the descrambled input data on the terminal side are despread, and the despread data are obtained. Compared with the prior art, when multi-path drifting is generated, scrambling code sequences of all cells are independently managed, the risk that antenna data of other irrelevant cells are abandoned or repeated improperly is avoided, self-adaption rate matching is achieved, and the purpose of keeping the data sequence of the descrambled and despread data on the terminal side corresponding to the antenna data of the cells one to one is achieved.
Description
Technical field
The present invention relates to communication field, particularly the descrambling and de-spreading method and system of end side input data.
Background technology
For WCDMA mobile communication system WCDMA terminal, the descrambling and de-spreading of L1 is generally all realized by hardware accelerator.Existing hardware accelerator needs input spreading rate to be 3.84 million per second, if terminal causes input rate to change because of mobile etc., then need to carry out rate transition in accelerator front end, add hardware interface on the one hand, the minor issue in performance may be caused on the one hand when soft handover.
The descrambling and de-spreading principle of WCDMA:
WCDMA is a spread spectrum system, needs digital signal to carry out spectrum-spreading and scrambling, correspondingly carry out descrambling and de-spreading at receiving terminal at transmitting terminal.
Transmitting terminal spectrum-spreading and scrambling principle is as follows:
If the modulation symbol sequence that certain code channel is corresponding is
wherein N
symfor the modulation symbol number that current code channel carries, corresponding spreading code is c
0, c
1..., c
sF-1, the chip sequence after spread spectrum is expressed as
i=0,1,…,N
bit-1
k=0,1,…,SF-1
By spread spectrum, chip sequence increases SF doubly than symbol sebolic addressing.SF can value 2,4,8 ..., 256 etc.
Transmitting terminal scrambling principle is as follows:
Scrambling is carried out for the chip sequence after spread spectrum, only chip sequence need be multiplied by scrambler successively.The long scrambler length of general employing is 38400, i.e. the chip sequence number that comprises of a radio frames.As:
Equally, at receiving terminal, namely get inverse process to aforesaid operations is descrambling and de-spreading.Visible, this process algorithm is simple, and amount of calculation is large, is applicable to very much adopting hardware accelerator.
Multipath principle:
As shown in Figure 1, signal is through wireless channel, be multiple to its channel impulse response of receiving terminal, therefore (path that in figure, multipath A is corresponding is numbering 2 to produce multipath, the path that multipath B is corresponding is numbering 3, the path that multipath C is corresponding is numbering 4, is directly numbering 1 to the path of mobile phone from signal transmitting terminal).The process that receiver obtains multi-path information by algorithm is called Multipath searching.
When the relative base station motion of terminal, transmission delay changes, and multipath also can change on a timeline.Briefly, when terminal is away from base station, multipath delay increases; Otherwise then reduce, this phenomenon is called multipath drift.As the path 1,2,3 and 4 in 1 in Fig. 2,2,3 and 4 respectively corresponding diagram 1, known, the length in path is followed successively by 1 < 2 < 3 < 4 from small to large.
The impact of multipath drift on descrambling and de-spreading:
When producing multipath drift, originally just can not one_to_one corresponding for the sequence of descrambling and de-spreading and data.When terminal is gradually away from base station, propagation delay increases, and in order to mate descrambling and de-spreading data sequence, terminal will process more data, and now we think that the baseband rate of terminal adds; Otherwise be then that baseband rate reduces.
In order to ensure the correctness of terminal descrambling and de-spreading, current processing method is repeated by antenna data or abandons a base unit, then sends into descrambling and de-spreading accelerator.For terminal away from base station, baseband rate increases, then can abandon a base unit, then sends into descrambling and de-spreading accelerator.
Current processing scheme principle is as shown in Figure 3:
Wherein, rate conversion module, descrambling and de-spreading accelerator, Multipath searching module form the loop that a band feeds back.When the result of Multipath searching block search judges to carry out rate transition, rate conversion module work, repeats antenna data or abandons a base unit, then sends into descrambling and de-spreading accelerator.Now descrambling and de-spreading accelerator also correspondingly will adjust the position receiving multipath.Rate conversion module also will notify that Multipath searching module input data rate there occurs change simultaneously, and the multi-path location that Multipath searching module is recorded also wants corresponding changing.But the present inventor finds, the program exists following defect:
1, rate transition flow process is complicated, relatedly have impact on descrambling and de-spreading accelerator and Multipath searching module.
2, descrambling and de-spreading accelerator needs to advance the speed and changes the multipath that brings and reshuffle, and hardware configuration complexity is promoted.
3, when soft handover, no matter with which community for reference, total antenna data that there are other communities, by the risk repeated irrelevantly or abandon, brings performance hidden danger.
Summary of the invention
A kind of end side is the object of the present invention is to provide to input the descrambling and de-spreading method and system of data, make when producing multipath drift, by the independent management of each cell scrambling sequence, avoid the antenna data of other regarding cells by inappropriate risk abandoning or repeat, realize adaptation rate coupling, the antenna data of the data sequence and each community that reach end side descrambling and de-spreading keeps object one to one.
For solving the problems of the technologies described above, the invention provides the descrambling and de-spreading method of a kind of end side input data, comprising following steps:
When the data rate of the antenna data coming from a community changes, the scrambler sequence of described community is carried out the skew corresponding with the change of described data rate;
Scrambler sequence according to described described community after skew carries out descrambling to described end side input data;
Despreading is carried out to described end side input data after descrambling, obtains the data after described despreading.
Present invention also offers the descrambling and de-spreading system of a kind of end side input data, comprise: Multipath searching module, rate conversion module, descrambling and de-spreading accelerator;
The change that described Multipath searching module occurs for the data rate searching for the antenna data coming from a community;
Described rate conversion module is used for when described Multipath searching block search changes to described data rate, and the scrambler sequence of described community is carried out the skew corresponding with the change of described data rate;
Described descrambling and de-spreading accelerator is used for carrying out descrambling according to the scrambler sequence of described described community after rate conversion module skew to described end side input data;
Described descrambling and de-spreading accelerator also for carrying out despreading to described end side input data after descrambling, obtains the data after described despreading.
When the relative base station motion of terminal, multipath drift phenomenon can be produced, when producing multipath drift, originally just can not one_to_one corresponding for the data sequence of end side descrambling and de-spreading and the antenna data of each community.When terminal is gradually away from base station, propagation delay increases, and in order to mate descrambling and de-spreading data sequence, terminal will process more antenna data, now thinks that the baseband rate of terminal adds; Otherwise be then that baseband rate reduces.In order to ensure the correctness of terminal descrambling and de-spreading, when terminal is away from base station, baseband rate increases, and is to solve by abandoning end side input data in prior art; When terminal is near base station, baseband rate reduces, solve by repeating end side input data in prior art, but because end side input data are the equal of the antenna data that each community is gathered, if processed end side input data, no matter with which community for reference, total antenna data that there are other communities, by the risk abandoned irrelevantly or repeat, brings performance hidden danger.And end side inputs the descrambling and de-spreading method of data in the present invention, can scrambler sequence the carrying out independently of Shi Ge community offset, because the scrambler sequence of each community is separate, when the data rate of the antenna data of a community changes, the descrambling and de-spreading data sequence of end side and the antenna data of this community can not one_to_one corresponding, now, the scrambler sequence of Zhi Xujianggai community carries out the skew corresponding with the change of the data rate of its antenna data, just can make the descrambling and de-spreading data sequence of end side and the antenna data one_to_one corresponding of this community, reach the object of adaptation rate coupling, scrambler sequence again due to each community is separate, so the skew of this cell scrambling sequence can not cause the skew of the scrambler sequence of other communities, therefore there is not the antenna data of other community by the descrambling and de-spreading method in the present invention by inappropriate risk abandoning or repeat, performance is optimized.
Preferably, described end side input data carry out synchronized update with the scrambler sequence of each community according to identical speed.
Only have end side to input data and carry out according to identical speed the antenna data one_to_one corresponding of descrambling and de-spreading data sequence with this community that synchronized update can ensure end side with the scrambler sequence of each community, enable terminal receive input data more rapidly and effectively.
Preferably, described data rate be changed in Preset Time, come from the change of the mean data rate of all multipaths in the antenna data of a community.
The change of the data rate of the antenna data of certain community in the present invention is preferably in Preset Time, and coming from the change of the mean data rate of all multipaths in the antenna data of this community, is the mean value in a period of time.
Preferably, the descrambling and de-spreading method of described end side input data, also comprises following steps:
The movement contrary with the skew of the scrambler sequence of described community is carried out in the position of described all multipaths.
By reserve migration, keep the relative position of multipath constant, ensure the correctness of descrambling and de-spreading sequence.This step is also inevitable in existing accelerator scheme, but existing accelerator also needs to carry out reprovision to Multipath searching window position, and in the present invention multipath search window without the need to reprovision.Therefore compared with existing scheme, the invention enables accelerator layoutprocedure to be simplified.
Preferably, describedly the scrambler sequence of community is being carried out in the step of the skew corresponding with the change of described data rate, when described data rate increases a chip, by the scrambler sequence of described community skew+1;
When described data rate reduces a chip, by the scrambler sequence of described community skew-1.
In the present invention, when the data rate of the antenna data of a community increases a chip, accordingly, by the scrambler sequence+1 of this community; When data rate reduces a chip, accordingly, by the scrambler sequence-1 of this community;
Accompanying drawing explanation
Fig. 1 is the path schematic diagram according to multipath of the prior art;
Fig. 2 is according to multipath drift schematic diagram of the prior art;
Fig. 3 is the descrambling and de-spreading principle schematic according to end side input data in prior art;
Fig. 4 is the descrambling and de-spreading method flow diagram according to the end side input data in first embodiment of the invention;
Fig. 5 realizes principle schematic according to the descrambling and de-spreading method of the end side input data in first embodiment of the invention;
Fig. 6 is the descrambling and de-spreading method flow diagram according to the end side input data in second embodiment of the invention;
Fig. 7 is the structural representation of the descrambling and de-spreading system according to the end side input data in four embodiment of the invention;
Fig. 8 is the structural representation of the descrambling and de-spreading system according to the end side input data in fifth embodiment of the invention;
Fig. 9 is the structural representation of the descrambling and de-spreading system according to the end side input data in sixth embodiment of the invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the embodiments of the present invention are explained in detail.But, persons of ordinary skill in the art may appreciate that in each execution mode of the present invention, proposing many ins and outs to make reader understand the application better.But, even without these ins and outs with based on the many variations of following execution mode and amendment, each claim of the application technical scheme required for protection also can be realized.
First execution mode of the present invention relates to the descrambling and de-spreading method of a kind of end side input data.Comprise following steps:
When the data rate of the antenna data coming from a community changes, the scrambler sequence of this community is carried out the skew corresponding with the change of data rate;
Scrambler sequence according to the above-mentioned community after skew carries out descrambling to end side input data;
Despreading is carried out to the end side input data after descrambling, obtains the data after despreading.
Idiographic flow as shown in Figure 4.
Step 401: when the data rate of the antenna data coming from a community changes, the scrambler sequence of this community is carried out the skew corresponding with the change of data rate.
In the present embodiment, when the data rate of the antenna data of a community increases a chip, need the scrambler sequence+1 of this community, with the descrambling and de-spreading sequence of side, matched termination input data; On the contrary, when data rate reduces a chip, need the scrambler sequence-1 of this community.
The principle of this step as shown in Figure 5.
When the data rate of the antenna data searching certain community changes, (signal of this changes in data rate is entered by accelerator configuration interface, for configuring new search window, this function is the function that conventional accelerator must be supported, therefore additional interface is not increased), the information of this changes in data rate is for offseting cell scrambling sequence, namely when data rate increases, scrambler sequence skew+1, on the contrary then offset-1.25.133 agreements regulations, the speed of terminal is adjusted frequency the soonest for every 200 milliseconds (20 frames) adjust 1/4 chip, and Multipath searching generally every 1 frame or 2 frames namely trigger once, therefore, only need to support that the scrambler sequence of+1 ,-1 offsets.Meanwhile, the program is very little for input-buffer demand, for WCDMA end side, only needs the input data of storage 16 chip.
Configuring condition:
In accelerator design of the prior art, after the signal of above-mentioned changes in data rate enters accelerator, need to reshuffle search window.When occurring that data abandon or repeat, need to process input-buffer front end, the skew also all will will carrying out+1 or-1 to all multipaths is unchanged to ensure that multipath inputs data relative to terminal.
And in present embodiment, after the signal feeding accelerator of above-mentioned changes in data rate, need not reshuffle search window, but through-rate conversion offsets scrambler.Relative to prior art, present embodiment can omit input-buffer front end and search window is reshuffled.
Behavior pattern:
Accelerator of the prior art, when carrying out soft handover, can only ensure that the data rate of a community is correct.In input-buffer front end to Serving cell carry out data abandon or repeat time, corresponding consequence also will be born in other communities.Suppose that direction, Liang Ge community is relative, then to the data manipulation of Serving cell 1/4 chip, can bring the skew of community, opposite 1/2 chip, and emulation shows, 1/2 chip offset can cause about 3 points of other performance losss.Then there are not the problems referred to above in present embodiment, the scrambler sequence skew independent maintenance of all communities.
Then step 402: the scrambler sequence according to the above-mentioned community after skew carries out descrambling to end side input data.
Then step 403: despreading is carried out to the end side input data after descrambling, obtains the data after despreading.
Descrambling in step 402 and 403 and the process of despreading are the inverse process of scrambling and spread spectrum respectively, and this part is prior art, introduces in detail in the introduction, does not repeat herein.
When the relative base station motion of terminal, multipath drift phenomenon can be produced, when producing multipath drift, originally just can not one_to_one corresponding for the data sequence of end side descrambling and de-spreading and the antenna data of each community.When terminal is gradually away from base station, propagation delay increases, and in order to mate descrambling and de-spreading data sequence, terminal will process more antenna data, now thinks that the baseband rate of terminal adds; Otherwise be then that baseband rate reduces.In order to ensure the correctness of terminal descrambling and de-spreading, when terminal is away from base station, baseband rate increases, and is to solve by abandoning end side input data in prior art; When terminal is near base station, baseband rate reduces, solve by repeating end side input data in prior art, but because end side input data are the equal of the antenna data that each community is gathered, if processed end side input data, no matter with which community for reference, total antenna data that there are other communities, by the risk abandoned irrelevantly or repeat, brings performance hidden danger.And end side inputs the descrambling and de-spreading method of data in the present invention, can scrambler sequence the carrying out independently of Shi Ge community offset, because the scrambler sequence of each community is separate, when the data rate of the antenna data of a community changes, the descrambling and de-spreading data sequence of end side and the antenna data of this community can not one_to_one corresponding, now, the scrambler sequence of Zhi Xujianggai community carries out the skew corresponding with the change of the data rate of its antenna data, just can make the descrambling and de-spreading data sequence of end side and the antenna data one_to_one corresponding of this community, reach the object of adaptation rate coupling, scrambler sequence again due to each community is separate, so the skew of this cell scrambling sequence can not cause the skew of the scrambler sequence of other communities, therefore there is not the antenna data of other community by the descrambling and de-spreading method in the present invention by inappropriate risk abandoning or repeat, performance is optimized.
Second execution mode of the present invention relates to the descrambling and de-spreading method of a kind of end side input data.Present embodiment is the further improvement of the first execution mode, main improvements are: in the present embodiment, the change of the data rate of the antenna data of a community is preferably in Preset Time, comes from the change of the mean data rate of all multipaths in the antenna data of this community; In addition, after step 401 in the first embodiment, before step 402, also comprise following steps: the movement contrary with the skew of the scrambler sequence of community is carried out in the position of all multipaths.
Specifically as shown in Figure 6.
Step 601: when the data rate of the antenna data coming from a community changes, the scrambler sequence of this community is carried out the skew corresponding with the change of data rate.
In the present embodiment, the above-mentioned change coming from the data rate of the antenna data of a community is preferably in Preset Time, and coming from the change of the mean data rate of all multipaths in the antenna data of this community, is the mean value in a period of time.
Step 602: the movement contrary with the skew of the scrambler sequence of community is carried out in the position of all multipaths.
By reserve migration, keep the relative position of multipath constant, ensure the correctness of descrambling and de-spreading sequence.This step is also inevitable in existing accelerator scheme, but existing accelerator also needs to carry out reprovision to Multipath searching window position, and in the present invention multipath search window without the need to reprovision.Therefore compared with existing scheme, the invention enables accelerator layoutprocedure to be simplified.
Step 603: the scrambler sequence according to the above-mentioned community after skew carries out descrambling to end side input data.
Step 604: despreading is carried out to the end side input data after descrambling, obtains the data after despreading.
Above-mentioned steps 603 is identical with 403 with the step 402 in the first execution mode with 604, does not repeat herein.
Present embodiment is the further improvement of the first execution mode, and the relevant technical details mentioned in the first execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the relevant technical details mentioned in present embodiment also can be applicable in the first execution mode.
3rd execution mode of the present invention relates to the descrambling and de-spreading method of a kind of end side input data.Present embodiment is the further improvement of the first execution mode, and main improvements are: in the present embodiment, and end side input data carry out synchronized update with the scrambler sequence of each community according to identical speed.End side input data carry out according to identical speed the antenna data one_to_one corresponding of descrambling and de-spreading data sequence with this community that synchronized update better can ensure end side with the scrambler sequence of each community, enable terminal receive input data more rapidly and effectively.
Present embodiment is the further improvement of the first execution mode, and the relevant technical details mentioned in the first execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the relevant technical details mentioned in present embodiment also can be applicable in the first execution mode.
The step of various method divides above, just in order to be described clearly, can merge into a step or splitting some step, being decomposed into multiple step, when realizing as long as comprise identical logical relation, all in the protection range of this patent.
Four embodiment of the invention relates to the descrambling and de-spreading system of a kind of end side input data, as shown in Figure 7, comprises: Multipath searching module, rate conversion module, descrambling and de-spreading accelerator.
Specifically, the change that Multipath searching module occurs for the data rate searching for the antenna data coming from a community, rate conversion module is used for when Multipath searching block search changes to data rate, the scrambler sequence of community is carried out the skew corresponding with the change of data rate, descrambling and de-spreading accelerator is used for carrying out descrambling according to the scrambler sequence of the community after rate conversion module skew to end side input data, and despreading is carried out to the end side input data after descrambling, obtain the data after despreading.
Preferably, when Multipath searching block search increases to data rate, rate conversion module is used for the scrambler sequence of described community skew+1; When Multipath searching block search reduces to data rate, rate conversion module is used for the scrambler sequence of community skew-1.
In addition, it is worth mentioning that, above-mentioned rate conversion module is integrated in descrambling and de-spreading accelerator inside in the present embodiment.As everyone knows, in prior art, in order to the antenna data one_to_one corresponding of the descrambling and de-spreading data sequence and each community that make end side, need to advance the speed in the front end of descrambling and de-spreading accelerator modular converter, rate conversion module, descrambling and de-spreading accelerator and Multipath searching module form the loop of a band feedback.When the result of Multipath searching block search judges to carry out rate transition, rate conversion module work, repeats antenna data or abandons a base unit, then sends into descrambling and de-spreading accelerator.Now descrambling and de-spreading accelerator also correspondingly will adjust the position receiving multipath.Rate conversion module also will notify that the speed of Multipath searching module input data there occurs change simultaneously, and the multi-path location that Multipath searching module is recorded also wants corresponding changing.In addition, rate conversion module also can affect antenna data administrative unit, if the characteristic that receiver support frequency domain equalization etc. are stronger with antenna data coupling, then may have influence on these characteristics further.Rate transition flow process is complicated, relatedly have impact on descrambling and de-spreading accelerator, Multipath searching module and antenna data administrative unit etc., and descrambling and de-spreading accelerator needs to advance the speed and changes the multipath brought and reshuffle, and hardware configuration complexity is promoted.And in the present embodiment, rate conversion module is integrated in descrambling and de-spreading accelerator inner, simplify accelerator configuration flow, the coupled relation of rate conversion module and other modules is removed, simplied system structure, the performance issue of soft handover can also be avoided simultaneously.
Be not difficult to find, present embodiment is the system embodiment corresponding with the first execution mode, and present embodiment can be worked in coordination with the first execution mode and be implemented.The relevant technical details mentioned in first execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the relevant technical details mentioned in present embodiment also can be applicable in the first execution mode.
5th execution mode of the present invention relates to the descrambling and de-spreading system of a kind of end side input data.Present embodiment is the further improvement of the 4th execution mode, main improvements are: the change of the data rate of the antenna data of the community mentioned in the 4th execution mode, be come from the change of the mean data rate of all multipaths in the antenna data of a community in the present embodiment in Preset Time.In addition, the descrambling and de-spreading system of the end side input data in present embodiment also add mobile module, as shown in Figure 8, this mobile module is used for the position that the multipath of changes in data rate does not occur in above-mentioned all multipaths to carry out the movement contrary with the skew of the scrambler sequence of this community.
Be not difficult to find, present embodiment is the system embodiment corresponding with the second execution mode, and present embodiment can be worked in coordination with the second execution mode and be implemented.The relevant technical details mentioned in second execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the relevant technical details mentioned in present embodiment also can be applicable in the second execution mode.
6th execution mode of the present invention relates to the descrambling and de-spreading system of a kind of end side input data.Present embodiment is the further improvement of the 4th execution mode, and main improvements are: the descrambling and de-spreading system of the end side input data in present embodiment also comprises synchronized update module.As shown in Figure 9, this synchronized update module carries out synchronized update with the scrambler sequence of each community according to identical speed for end side is inputted data.
Be not difficult to find, present embodiment is the system embodiment corresponding with the 3rd execution mode, and present embodiment can be worked in coordination with the 3rd execution mode and be implemented.The relevant technical details mentioned in 3rd execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the relevant technical details mentioned in present embodiment also can be applicable in the 3rd execution mode.
It is worth mentioning that, each module involved in above-mentioned each system is logic module, and in actual applications, a logical block can be a physical location, also can be a part for a physical location, can also realize with the combination of multiple physical location.In addition, in order to outstanding innovative part of the present invention, the unit not too close with solving technical problem relation proposed by the invention is not introduced in present embodiment, but this does not show the unit that there is not other in present embodiment.
Persons of ordinary skill in the art may appreciate that the respective embodiments described above realize specific embodiments of the invention, and in actual applications, various change can be done to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (11)
1. a descrambling and de-spreading method for end side input data, is characterized in that, comprise following steps:
When the data rate of the antenna data coming from a community changes, the scrambler sequence of described community is carried out the skew corresponding with the change of described data rate;
Scrambler sequence according to described described community after skew carries out descrambling to described end side input data;
Despreading is carried out to described end side input data after descrambling, obtains the data after described despreading.
2. the descrambling and de-spreading method of end side input data according to claim 1, is characterized in that, described end side input data carry out synchronized update with the scrambler sequence of each community according to identical speed.
3. the descrambling and de-spreading method of end side according to claim 1 input data, is characterized in that, described data rate be changed in Preset Time, come from the change of the mean data rate of all multipaths in the antenna data of a community.
4. the descrambling and de-spreading method of end side input data according to claim 3, it is characterized in that, described the scrambler sequence of community is carried out the step of the skew corresponding with the change of described data rate after, before according to the scrambler sequence of described described community after skew the step of descrambling being carried out to described end side input data, also comprise following steps:
The movement contrary with the skew of the scrambler sequence of described community is carried out in the position of described all multipaths.
5. the descrambling and de-spreading method of end side input data according to claim 1, it is characterized in that, describedly the scrambler sequence of community is being carried out in the step of the skew corresponding with the change of described data rate, when described data rate increases a chip, by the scrambler sequence of described community skew+1;
When described data rate reduces a chip, by the scrambler sequence of described community skew-1.
6. a descrambling and de-spreading system for end side input data, is characterized in that, comprise: Multipath searching module, rate conversion module, descrambling and de-spreading accelerator;
The change that described Multipath searching module occurs for the data rate searching for the antenna data coming from a community;
Described rate conversion module is used for when described Multipath searching block search changes to described data rate, and the scrambler sequence of described community is carried out the skew corresponding with the change of described data rate;
Described descrambling and de-spreading accelerator is used for carrying out descrambling according to the scrambler sequence of described described community after rate conversion module skew to described end side input data, and despreading is carried out to described end side input data after descrambling, obtain the data after described despreading.
7. the descrambling and de-spreading system of end side input data according to claim 6, is characterized in that, also comprise synchronized update module;
Described synchronized update module is used for described end side input data to carry out synchronized update with the scrambler sequence of each community according to identical speed.
8. the descrambling and de-spreading system of end side according to claim 6 input data, is characterized in that, described data rate be changed in Preset Time, come from the change of the mean data rate of all multipaths in the antenna data of a community.
9. the descrambling and de-spreading system of end side input data according to claim 8, is characterized in that, also comprise mobile module;
Described mobile module is used for the position of described all multipaths to carry out the movement contrary with the skew of the scrambler sequence of described community.
10. the descrambling and de-spreading system of end side input data according to claim 6, it is characterized in that, when described Multipath searching block search increases a chip to described data rate, described rate conversion module is used for the scrambler sequence of described community skew+1;
When described Multipath searching block search reduces a chip to described data rate, described rate conversion module is used for the scrambler sequence of described community skew-1.
The descrambling and de-spreading system of 11. end side input data according to claim 6, it is characterized in that, it is inner that described rate conversion module is integrated in described descrambling and de-spreading accelerator.
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