CN101102124B - A Rake receiving method and device - Google Patents
A Rake receiving method and device Download PDFInfo
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- CN101102124B CN101102124B CN2007101289714A CN200710128971A CN101102124B CN 101102124 B CN101102124 B CN 101102124B CN 2007101289714 A CN2007101289714 A CN 2007101289714A CN 200710128971 A CN200710128971 A CN 200710128971A CN 101102124 B CN101102124 B CN 101102124B
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Abstract
The invention is concerned with the Rake receiver method and equipment, consists of the data caching module and the Rake unite module and also the dynamic disturbance or extension decoding module that achieves disturbance or extension resolving of the corresponding data channel data frames by using the path information from section search and path search and the disturbance and the extension code of the channel of the software configuration; the dynamic channel estimation module that connects the dynamic disturbance or extension decoding module, and conducts channel estimation according to the channel data of main public pilot frequency receiving from the dynamic disturbance or extension decoding module; the insert / withdraw module operates to the channel that connects the dynamic disturbance or extension decoding module; and the dynamic channel repairing module connects with the insert / withdraw module and the data caching module separately to accomplish channel repairing of the data channel.
Description
Technical field
The present invention relates to Rake (rake) method of reseptance and device, relate in particular to the Rake receiving method and the device of digital baseband down link in the WCDMA system.
Background technology
In the WCDMA system, digital baseband down link receiving system as shown in Figure 1, is made up of Cell searching/path searcher module, Rake receiver and Digital Signal Processing (DSP) module.Wherein, Rake receiver is used at receiving terminal separating multiple diameter transmitting signal component.
As shown in Figure 2, traditional Rake receiver comprises: the descrambling and de-spreading module of sampled point cache module, channel, channel estimation module, data cache module, channel compensation block and Rake merge module.This traditional Rake receiver needs earlier sampled point to be carried out buffer memory in data handling procedure, though can guarantee all data so complete physical frame structure (data frame structure as shown in Figure 3) is arranged all, and realizes the static treatment to follow-up data.But also have significant disadvantages and deficiency: at first, system needs a bigger sampling memory cell; Secondly, can not realize the real-time processing of data fully; The 3rd, Rake receiver needs often to carry out the path switching processing in the process that receives data, cause the loaded down with trivial details of path management.
Summary of the invention
The Rake receiving method and the hardware unit that the object of the present invention is to provide a kind of dynamic time sequence to adjust are handled in real time to data in the receiving course of data, save hardware spending, and simplify the management process in path in the Rake receiving course.
The present invention by the following technical solutions, a kind of rake reception device comprises with the lower part:
Dynamic descrambling and de-spreading module, the routing information that obtains according to Cell searching and route searching, and the channel scrambler and the spreading code of software arrangements, finish the descrambling and de-spreading of corresponding data channel data frame, and with output data channel signal and Primary Common Pilot Channel data deliver to dynamic channel estimation module and described data cache module respectively, if the position of current path changes, then described dynamic descrambling and de-spreading module finishes the processing of current data frame, begins new path position is carried out descrambling and de-spreading; Described dynamic channel estimation module links to each other with described dynamic descrambling and de-spreading module, and carries out channel estimating according to the Primary Common Pilot Channel data that receive from dynamic descrambling and de-spreading module; Interpolation/abstraction module links to each other with described dynamic channel estimation module, finishes the interpolation/extraction of channel estimation value and handles;
The dynamic channel compensating module links to each other respectively with described data cache module with described interpolation/abstraction module, is used for according to the principle of channel compensation data channel being carried out corresponding channel compensation.
Data cache module links to each other with described dynamic channel compensating module with dynamic descrambling and de-spreading module respectively, is used for the data of data channel are carried out buffer memory;
Rake merges module, and the The data high specific on each path after the compensation is merged.
Further, described dynamic descrambling and de-spreading module also comprises in order to produce the scrambler generator of channel scrambler, in order to the spreading code generator of generation spreading code with in order to the descrambling and de-spreading device to the channel data frame descrambling and de-spreading.
Further, described dynamic channel estimation module also comprises dynamic channel estimated value computing module and dynamic channel estimated value filter module;
Described dynamic channel estimated value computing module is used for calculating channel estimation value according to the Primary Common Pilot Channel data symbol that receives;
Described dynamic channel estimated value filter module is the FIR filter, is used for described channel estimating Value Data is carried out Filtering Processing.
Further, the data channel of described dynamic descrambling and de-spreading module support is DPCH or Secondary Common Control Physical Channel.
Further, the interpolation of described interpolation/abstraction module is treated to zeroth order maintenance interpolation or first-order linear interpolation.
In order to solve the problems of the technologies described above, the present invention also provides a kind of Rake receiving method, said method comprising the steps of:
Step 2, dynamic channel estimation module and interpolation/abstraction module use Primary Common Pilot Channel data described in the step 1 to carry out channel estimating and interpolation/extraction, obtain the channel estimation value in each path; Simultaneously, data cache module is carried out buffer memory to the data of described data channel;
Step 3, the dynamic channel compensating module carries out channel compensation according to the principle of channel compensation to the data of data channel;
Step 4, Rake merge the data symbol of module after to the compensation in each path and carry out high specific and merge.
Further, in the described step 1, if the position of current path changes, then described dynamic descrambling and de-spreading module finishes the processing of current data frame, begins new path position is carried out descrambling and de-spreading.
Further, in the described step 2,, then keep previous channel estimation value constant if, can not calculate channel estimation value because the variation of path position causes the Primary Common Pilot Channel Frame imperfect.
Further, in the described step 3,, perhaps do not have corresponding channel estimating to compensate, then export remainder certificate if, cause the current data frame loss of data because the current path position changes.
Compared with prior art, dynamic time sequence of the present invention is adjusted Rake receiving method and device, has greatly simplified the management process in path during Rake receives, and has saved the time of hardware handles, has realized the real-time of Base-Band Processing simultaneously.And this rake reception device does not need to take the DSP resource, has saved hardware resource and software overhead, has reduced system cost.
Description of drawings
Fig. 1 is a down link receiving system schematic diagram in the WCDMA system;
Fig. 2 is existing Rake receiver structure chart;
Fig. 3 is the data flow diagram that existing Rake receiver is handled;
Fig. 4 is a Rake receiver structure chart of the present invention;
Fig. 5 is a Rake receiving method flow chart of the present invention;
Fig. 6 is the data flow diagram that Rake receiver of the present invention is handled;
Fig. 7 is P-CPICH channel estimating figure;
Fig. 8 is that dynamic time sequence is adjusted channel estimating and channel compensation schematic diagram.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated.
As shown in Figure 4, be the Rake receiver structure chart of first embodiment of the invention.This device comprises: dynamic descrambling and de-spreading module, and the dynamic channel estimation module, interpolation/abstraction module, data cache module, the dynamic channel compensating module, Rake merges module.Wherein,
With reference to shown in Figure 4, be the Rake receiver structure chart of first embodiment of the invention.This device comprises: dynamic descrambling and de-spreading module, and the dynamic channel estimation module, interpolation/abstraction module, data cache module, the dynamic channel compensating module, Rake merges module.Wherein,
The dynamic routing information that obtains according to Cell searching and route searching of descrambling and de-spreading module, and the channel scrambler and the spreading code of software arrangements are finished the descrambling and de-spreading process of respective channels Frame.This descrambling and de-spreading module comprises the scrambler generator, spreading code generator and descrambling despreader three parts.Support data channel, as DPCH (Dedicated Physical Channel, DPCH) and Secondary Common Control Physical Channel (Secondary Common Control Physical Channel, S-CCPCH) etc. descrambling and de-spreading, and with output data channel signal and Primary Common Pilot Channel data deliver to dynamic channel estimation module and described data cache module respectively;
The dynamic channel estimation module comprises two parts: dynamic channel estimated value computing module and dynamic channel estimated value filter module.Described dynamic channel estimated value computing module calculates channel estimation value according to the P-CPICH symbol that receives.For the influence of filtering noise, also need the channel estimation value that calculates is carried out Filtering Processing, dynamic channel estimated value filter module is finished this function, and what the channel estimating value filtering adopted is the FIR filter.
After channel estimation value carried out the FIR filter process, obtain the precise channels estimated value in order to make data channel, interpolation/abstraction module is finished interpolation/extraction of channel estimating and is handled.Can use zeroth order to keep interpolation, perhaps first-order linear interpolation to the interpolation of channel estimation value.After channel estimation value finished interpolation/extraction, make channel estimation value corresponding one by one with data symbol, speed is mated fully.
Data cache module links to each other with described dynamic descrambling and de-spreading module, is used for the data of data channel are carried out buffer memory.
The dynamic channel compensating module links to each other respectively with described data cache module with described interpolation/abstraction module, according to the principle of channel compensation data channel is carried out corresponding channel compensation.
Rake merges module the The data high specific on each path after compensating is merged.
As shown in Figure 5, be second embodiment of the present invention Rake receiving method flow chart.The method comprising the steps of:
Step 501: obtain the position in each path from Cell searching and route searching unit, obtain the scrambler and the spreading code of channel from software;
Step 502: P-CPICH channel and data channel to each path in dynamic descrambling and de-spreading module carry out descrambling and de-spreading, obtain the P-CPICH in each path and the data symbol of data channel respectively.When the position of current path changed, the descrambling and de-spreading module can finish the processing of current data frame, brought into use new path position to carry out descrambling and de-spreading.Because the variation of path position is arranged, cause some symbol can not carry out complete descrambling and de-spreading, these symbols will be dropped, and the Frame of descrambling and de-spreading module output might be imperfect like this;
Step 503: in dynamic channel estimated value computing module to each path, use P-CPICH to carry out channel estimation calculation, if because the variation of path position, the P-CPICH channel data frame is imperfect, can not calculate channel estimation value, then keep previous channel estimation value constant;
Step 504: in dynamic channel estimated value filtration module, the channel estimation value that calculates is carried out filter filtering.If this moment, path position changed, then current filter is resetted, use new path position to restart filtering;
Step 505: in interpolation/abstraction module, filtered channel estimation value is carried out interpolation/extraction, obtain the channel estimation value in each path;
Step 506: the data to data channel in data cache module are carried out buffer memory;
Step 507: the data to data channel in the dynamic channel compensating module are carried out channel compensation.If, cause the current data frame loss of data because the current path position changes, perhaps there is not corresponding channel estimating to compensate, then export remainder certificate;
Step 508: the data symbol after the compensation in each path is carried out high specific merge.
Come technical scheme of the present invention is described below by the example in concrete the application.In an application example of the present invention, in DRP data reception process, the process that system finishes the Rake reception is as follows:
1), dsp software initiates a Cell searching and route searching process, Cell searching has obtained information such as the scrambler of current area and spreading code.Feed back to dsp software.Simultaneously, begin to carry out route searching, the routing information that searches is sent to dynamic time sequence adjust Rake receiver.
2), DSP adjusts the Rake machine to dynamic time sequence and disposes corresponding scrambler, spreading code information, simultaneously, dynamic time sequence is adjusted the Rake machine and is received the routing information that path searcher module sends over, dynamically carry out descrambling and de-spreading in the descrambling and de-spreading module, obtaining P-CPICH channel data and data channel signal behind the descrambling and de-spreading.With reference to shown in Figure 6, with the P-CPICH channel is example, if the variation of path position has taken place this moment, promptly change to path position 1 from path position 0, dynamic time sequence is adjusted the Rake machine and is received new path from path searcher module, and promptly path position 1, restarts to carry out descrambling and de-spreading from path position 1, the symbol that does not have descrambling and de-spreading to finish in the former frame (frame 1) all abandons, and symbol 9 abandons as shown in the figure.The tentation data channel is DPCH, and the phase bias of itself and P-CPICH channel is 0, and the spreading factor of DPCH is 256, the then same because variation in path, and last symbol that causes DPCH channel frame 1 is that symbol 9 abandons.
3), dynamic channel estimated value computing module uses the P-CPICH channel to carry out channel estimation value and calculates, generally speaking, two P-CPICH symbols calculate a channel estimation value, as shown in Figure 7.If, cause the CPICH symbol of postamble not occur in pairs, as shown in Figure 8 because path position changes.Because path position changes, the 9th symbol of P-CPICH channel lost, and channel estimation module can not calculate corresponding channel estimation value, the channel estimation value 3 that channel estimation module will once calculate before will keeping.
4), in dynamic channel estimated value filtration module, the channel estimation value that calculates is carried out filtering is obtained the channel estimation value in path.If path position changes, then when beginning, new route need reset to filter, supposing to have limit for length's impact response filter (FIR) is 3 rank mean filters, after the path changes, preceding 3 channel estimation values that new route calculates are followed successively by F1, F2, F3, then the reseting procedure of filter is as follows:
After receiving first channel estimation value, FIR is output as: F1+F1+F1.
After receiving second channel estimation value, FIR is output as: F2+F1+F1.
After receiving the 3rd channel estimation value, FIR is output as: F3+F2+F1.
Recover normal with postfilter work.
5), in interpolation/abstraction module, carry out interpolation/extraction processing to getting channel estimation value after the filtering.
6), when the calculating channel estimated value, in data cache module to carrying out buffer memory with constantly data channel.
7), after channel estimation value produces, the dynamic channel compensating module can be read corresponding channel data constantly and carry out channel compensation from data cache module.If because path change causes data channel signal to lose or the CPICH channel does not have effective channel estimation value, then the compensation result of these data is zero.As shown in Figure 9, the DPCH channel causes symbol 8 not have corresponding channel estimation value because path change causes symbol 9 to be lost simultaneously, and therefore, the channel compensation result of symbol 8 is output as 0.
8), the channel data after the compensation of each paths sends into Rake and merges module, merges, and produces final channel data.
9), the data symbol after Rake merged sends Rake receiver, carries out subsequent treatment.
Certainly; the present invention also can have other numerous embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; be familiar with those of ordinary skill in the art and can make various corresponding changes and distortion, but these corresponding changes and distortion all should belong to protection range of the presently claimed invention according to the present invention.
Claims (9)
1. a rake reception device comprises data cache module and Rake merging module, it is characterized in that described rake reception device also comprises:
Dynamic descrambling and de-spreading module, the routing information that obtains according to Cell searching and route searching, and the channel scrambler and the spreading code of software arrangements, finish the descrambling and de-spreading of corresponding data channel data frame, and the data channel signal and the Primary Common Pilot Channel data of output are sent dynamic channel estimation module and described data cache module; If the position of current path changes, then described dynamic descrambling and de-spreading module finishes the processing of current data frame, begins new path position is carried out descrambling and de-spreading;
Described dynamic channel estimation module links to each other with described dynamic descrambling and de-spreading module, and carries out channel estimating according to the Primary Common Pilot Channel data that receive from dynamic descrambling and de-spreading module;
Interpolation/abstraction module links to each other with described dynamic channel estimation module, finishes the interpolation/extraction of channel estimation value and handles;
The dynamic channel compensating module links to each other respectively with described data cache module with described interpolation/abstraction module, is used for according to the principle of channel compensation data channel being carried out corresponding channel compensation.
2. rake reception device according to claim 1, it is characterized in that, described dynamic descrambling and de-spreading module also comprises in order to produce the scrambler generator of channel scrambler, in order to the spreading code generator of generation spreading code with in order to the descrambling and de-spreading device to the channel data frame descrambling and de-spreading.
3. rake reception device according to claim 1 is characterized in that, described dynamic channel estimation module also comprises dynamic channel estimated value computing module and dynamic channel estimated value filter module;
Described dynamic channel estimated value computing module is used for calculating channel estimation value according to the Primary Common Pilot Channel data symbol that receives;
Described dynamic channel estimated value filter module is used for described channel estimating Value Data is carried out Filtering Processing.
4. rake reception device according to claim 1 and 2 is characterized in that, the data channel of described dynamic descrambling and de-spreading module support is DPCH or Secondary Common Control Physical Channel.
5. rake reception device according to claim 3 is characterized in that, described dynamic channel estimated value filter module is the FIR filter.
6. rake reception device according to claim 1 is characterized in that, the interpolation of described interpolation/abstraction module is treated to zeroth order and keeps interpolation or first-order linear interpolation.
7. a Rake receiving method is characterized in that, may further comprise the steps:
Step 1, dynamically the descrambling and de-spreading module is according to the positional information in each path that obtains from Cell searching and route searching unit, and according to the scrambler and the spreading code of the channel that obtains from software, Primary Common Pilot Channel and data channel to each path carry out descrambling and de-spreading, obtain the Primary Common Pilot Channel in each path and the data symbol of data channel respectively;
Step 2, dynamic channel estimation module and interpolation/abstraction module use Primary Common Pilot Channel data described in the step 1 to carry out channel estimating and interpolation/extraction, obtain the channel estimation value in each path; Simultaneously, data cache module is carried out buffer memory to the data of described data channel;
Step 3, the dynamic channel compensating module carries out channel compensation according to the principle of channel compensation to the data of data channel;
Step 4, Rake merge the data symbol of module after to the compensation in each path and carry out high specific and merge;
Wherein, in the described step 1, if the position of current path changes, then described dynamic descrambling and de-spreading module finishes the processing of current data frame, begins new path position is carried out descrambling and de-spreading.
8. Rake receiving method according to claim 7 is characterized in that, in the described step 2, if because the variation of path position causes the Primary Common Pilot Channel Frame imperfect, can not calculate channel estimation value, then keeps previous channel estimation value constant.
9. Rake receiving method according to claim 7 is characterized in that, in the described step 3, if because the current path position changes, cause the current data frame loss of data, does not perhaps have corresponding channel estimating to compensate, and then exports remainder certificate.
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| US8699529B2 (en) | 2008-03-28 | 2014-04-15 | Qualcomm Incorporated | Broadband pilot channel estimation using a reduced order FFT and a hardware interpolator |
| CN101572565B (en) * | 2009-06-05 | 2013-03-13 | 华为技术有限公司 | Real-time antenna data searching method, device and site |
| CN102487286B (en) * | 2010-12-01 | 2014-08-13 | 中兴通讯股份有限公司 | Method and device for processing data |
| CN106231643A (en) * | 2016-07-14 | 2016-12-14 | 华为技术有限公司 | A kind of signal combining method and wireless terminal |
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| US6085104A (en) * | 1998-03-25 | 2000-07-04 | Sharp Laboratories Of America, Inc. | Pilot aided, time-varying finite impulse response, adaptive channel matching receiving system and method |
| CN1286534A (en) * | 1999-11-10 | 2001-03-07 | 深圳市中兴通讯股份有限公司 | Channel estimating method used in WCDMA receiver |
| CN1474528A (en) * | 2002-08-06 | 2004-02-11 | 深圳市中兴通讯股份有限公司 | Channel evaluation method in wide band CDMA communication system |
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| CN1193225A (en) * | 1996-12-03 | 1998-09-16 | 三星电子株式会社 | Searching device used in CDMA receiver and method thereof |
| US6085104A (en) * | 1998-03-25 | 2000-07-04 | Sharp Laboratories Of America, Inc. | Pilot aided, time-varying finite impulse response, adaptive channel matching receiving system and method |
| CN1286534A (en) * | 1999-11-10 | 2001-03-07 | 深圳市中兴通讯股份有限公司 | Channel estimating method used in WCDMA receiver |
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Effective date of registration: 20160505 Address after: Dameisha Yantian District of Shenzhen City, Guangdong province 518085 Building No. 1 Patentee after: SHENZHEN ZTE MICROELECTRONICS TECHNOLOGY CO., LTD. Address before: 518057 Nanshan District Guangdong high tech Industrial Park, South Road, science and technology, ZTE building, Ministry of Justice Patentee before: ZTE Corporation |
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Application publication date: 20080109 Assignee: Xi'an Chris Semiconductor Technology Co. Ltd. Assignor: SHENZHEN ZTE MICROELECTRONICS TECHNOLOGY CO., LTD. Contract record no.: 2019440020036 Denomination of invention: A Rake receiving method and device Granted publication date: 20100414 License type: Common License Record date: 20190619 |