CN100525155C - Up demodulation method for different speed service - Google Patents
Up demodulation method for different speed service Download PDFInfo
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- CN100525155C CN100525155C CNB031193935A CN03119393A CN100525155C CN 100525155 C CN100525155 C CN 100525155C CN B031193935 A CNB031193935 A CN B031193935A CN 03119393 A CN03119393 A CN 03119393A CN 100525155 C CN100525155 C CN 100525155C
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Abstract
This invention relates to an up-line demodulation method to different rate service including that a broadband CDMA system demodulates the base band signals in DPCCH to get transmission form combined indication values (TFCI) to be examined to get the true SF value including: A carrying out the first de-spread spectrum, channel estimation and RAKE merge to the base band signals according to the set SF in DPPCH at the time of demodulating the base band to recover the merged sub channel services to the channel service to store a frame of demodulation mid results, B proceeding in the second de-spread spectrum with true SF to the result from A to get a frame of results of DPDCH channel, reducing occupation of RAM resources and shortening the time of up-line demodulation.
Description
Technical field
The present invention relates to uplink demodulation technology professional in the Wideband Code Division Multiple Access (WCDMA) (WCDMA), particularly a kind of uplink demodulation method to the different rates business.
Background technology
In the WCDMA system, after the business of sending the base station, opposite end was received in the base station, demodulation must be carried out to this business in the base station, and the demodulating process of business is comprised steps such as separating spread spectrum, channel estimating and multipath (RAKE) merging.When timing is separated to the business in the special uplink channel (DPCH) in the base station, the WCDMA system need carry out demodulation to the business in the ascending physical signal exclusive data subchannel (DPDCH) according to spreading factor (SF).The SF of different rates business is different, different rate business is meant that the flow of every frame business varies in size, SF can be 4,8,16,32,64,128 and 256, when the service traffics that need demodulation are big, SF then gets smaller value, and when service traffics that need demodulation hour, SF then gets higher value, for example: when the value of SF was 4, the every frame of DPDCH can 9600 symbols of demodulation (symbol); When the value of SF was 256, the every frame of DPDCH can demodulation 150symbol.
As shown in Figure 1, the realization schematic diagram of uplink demodulation method is carried out in the data service that Fig. 1 sends for peer node, and its detailed process is:
Step 101,102,103,104, ascending physical signal special-purpose control subchannel (DPCCH) carries out demodulation to this frame base band data, promptly carries out DPCCH and separates spread spectrum, channel estimating, DPCCH RAKE merging, deciphers out the value of TFCI (transformat combination indication);
Step 105,106,107, inquire the SF value of this frame base band data business from the value of TFCI, the WCDMA system carries out demodulation according to this SF value to this frame data business, promptly carries out DPDCH and separates spread spectrum, channel estimating, DPDCH RAKE merging, draws the demodulation result of this frame.
Can know by such scheme, the frame business that this method must will receive is on the one hand stored, until the value of SF could be carried out the demodulation of DPDCH to the base band business of this frame after determining, the base band service needed of this frame takies a large amount of static memory (RAM) resource, in implementation procedure, need plug-in memory, increased the difficulty that realizes professional uplink demodulation; This method owing to separate the DPCCH demodulation that timing must be finished this frame business earlier in that a frame business is carried out DPDCH, has prolonged the professional demodulation time on the other hand, has limited the professional flow that carries out uplink demodulation.
When the business after the demodulation is stored with computing, this business is stored among the RAM by the form of channel, different according to the SF value, the flow that the base band business of each each time slot of bar channel is stored among the RAM after the process demodulation is different, if the memory space of RAM is 2560symbol, when SF was 32, the space of RAM is divided into 8 DPCH channels stored simultaneously, and the data volume after each time slot storage demodulation of each bar channel is 80symbol; When SF was 16, the space of RAM is divided into 4 DPCH channels stored simultaneously, and the data volume after each time slot demodulation of each bar channel is 160symbol; When SF was 8, the space of RAM is divided into 2 DPCH channels stored simultaneously, and the data volume after each time slot demodulation of each bar channel is 320symbol; When SF was 4, the space of RAM is divided into 1 DPCH channel stored simultaneously, and the data volume after each frame demodulation of each bar channel is 640symbol.RAM adopts dynamic management method in the prior art, RAM must set different DPCH channel numbers according to the value of SF and with the different DPCH channel capacity of setting the data business be stored, this resource allocation policy exists the demodulation process complexity of WCDMA system to business, has increased the low problem of resource fragmentation and resource utilization.
Summary of the invention
In view of this, the invention provides a kind of uplink demodulation method to the different rates business, this method has not only shortened the time of professional uplink demodulation, increased the professional flow that carries out uplink demodulation, and reduced taking of RAM resource, the low problem of the utilization of resources when having solved professional after the storage demodulation.
According to above-mentioned purpose, a kind of uplink demodulation method to the different rates business, this method comprises, broadband CDMA system carries out demodulation to business in the ascending physical signal Dedicated Control Channel, obtain the transformat combination indicated value, query transmission format combination indicated value draws real spreading factor value, and this method also comprises:
A, in the ascending physical signal Dedicated Control Channel, the data business carried out demodulation and obtains true spreading factor value in, in the ascending physical signal dedicated data channel according to the spreading factor value that is provided with, form according to minute channel, the data business is carried out separating the first time spread spectrum, channel estimating and multipath to be merged, branch channel service after the multipath merging is reduced to channel service, and stores the demodulation intermediate object program of a frame;
B, the demodulation intermediate object program of the described frame of steps A is carried out separating spread spectrum the second time, obtain the ascending physical signal dedicated data channel demodulation result of a frame with real spreading factor value.
The spreading factor value of the described setting of steps A is not more than the minimal frequency spreading factor value of uplink physical channel.
The described spreading factor value that is provided with further comprises:
The minimal frequency spreading factor value of uplink physical channel is 4, and the value that spreading factor is set is 4;
The minimal frequency spreading factor value of uplink physical channel is 8, and the value that spreading factor is set is 8;
The minimal frequency spreading factor value of uplink physical channel is 16, and the value that spreading factor is set is 16;
The minimal frequency spreading factor value of uplink physical channel is 32,64,128 and 256, and the value that spreading factor is set is 32.
The described ascending physical signal dedicated data channel of step B demodulation result is according to the demodulating data service traffics storage of channel one time slot, and the demodulating data service traffics of described channel one time slot are to determine according to the spreading factor value that is provided with.
This method also comprises:
It is 4 o'clock that the spreading factor value is set, and the demodulating data service traffics of a time slot of a channel are 640symbol;
It is 8 o'clock that the spreading factor value is set, and the demodulating data service traffics of a time slot of a channel are 320symbol;
It is 16 o'clock that the spreading factor value is set, and the demodulating data service traffics of a time slot of a channel are 160symbol;
It is 32 o'clock that the spreading factor value is set, and the demodulating data service traffics of a time slot of a channel are 80symbol.
Described form according to minute channel is carried out separating the first time spread spectrum, channel estimating and multipath to baseband signal and is merged, and the process that the branch channel service after multipath is merged is reduced to channel service is:
A1, in such a way is provided with spreading factor, and a channel is split as several minutes channel:
One is provided with spreading factor is 4 channel, is split as 8 branch channels, and its position number is respectively 0～7;
One is provided with spreading factor is 8 channel, is split as 4 branch channels, and its position number is respectively 0～3;
One is provided with spreading factor is 16 channel, is split as 2 branch channels, and its position number is respectively 0～1;
One is provided with spreading factor is that 32 channel is split as 1 branch channel, and its position number is 0;
A2, carry out separating the first time steps such as spread spectrum, channel estimating, multipath merging according to minute channel;
A3, after multipath merges, according to the position number and the main branch channel designator of minute channel will belong to a channel each minute channel demodulation intermediate object program revert to the demodulation intermediate object program of complete channel in order.
Described main the branchs channel designator process that is provided with under the branch channel is: the position number of a channel is that 0 branch channel is exactly the main channel that divides of this channel, main Channel Elements sequence number of dividing channel be exactly this channel all divide master's branch channel designator of channels.
Divide channel for each the ascending physical signal Dedicated Control Channel is set, and utilize this ascending physical signal Dedicated Control Channel to carry out channel estimating.
By said method as can be seen, this method makes business carry out demodulation in DPCCH and obtains in the true SF, make the professional demodulation first time of in DPDCH, carrying out simultaneously according to the SF value of estimating, obtain in DPDCH, to carry out the demodulation second time according to the real SF value general demodulation result first time behind the true SF, the present invention adopts the method for separating spread spectrum for twice, only need the business after the demodulation first time of the several time slots of storage, the business of these several time slots is obtaining to carry out the demodulation second time behind the true SF, this method has not only reduced taking of RAM, has avoided plug-in memory; And again business is separated spread spectrum after not needing to draw by the time the value of SF, and shortened the time of professional uplink demodulation, increased the professional flow that carries out uplink demodulation.This method becomes the identical channel of a plurality of data capacities according to the SF value of estimating with the spatial division of RAM simultaneously, has solved the lower problem of resource utilization.
Description of drawings
Fig. 1 carries out the realization schematic diagram of uplink demodulation method for data service.
Fig. 2 carries out the realization schematic diagram of uplink demodulation to the data business for the present invention.
Fig. 3 splits schematic diagram for the present invention divides channel.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, by the following examples and with reference to accompanying drawing, the present invention is described in more detail.
Because the SF value that this method utilization is estimated is carried out DPDCH to business and separated spread spectrum for the first time, so at first must estimate the value of SF, when the minimum SF value of a channel setting was 4, then the SF value of Gu Jiing was 4; When the minimum SF value of DPCH channel setting was 8, then the SF value of Gu Jiing was 8; When the minimum SF value of DPCH channel setting was 16, then the SF value of Gu Jiing was 16; When the minimum SF value of DPCH channel setting was 32,64,128,256, then the SF value of Gu Jiing was 32; Estimated SF value must be less than or equal to the minimum SF value of channel.
Estimated SF value has been arranged, just can carry out uplink demodulation business.As shown in Figure 2, Fig. 2 carries out the realization schematic diagram of uplink demodulation for the present invention to business, and its detailed process is:
Step 200,201, this end node receives the base band data service signal that peer node sends, this signal is separated in the spread spectrum in DPCCH, according to estimated SF value this service signal is carried out DPDCH and separate the spread spectrum processing for the first time, the flow of demodulation business is to determine according to estimated SF value;
Step 202,203,204, DPCCH carried out channel estimating after, this service signal is carried out DPCCH RACK at DPCCH merges, professional in DPCCH, carry out demodulation after, draw the value of true SF;
Step 205,206,207, DPDCH carried out channel estimating after, the business of separating spread spectrum is carried out channel estimating by the form of minute channel and multipath (RAKE) merges, the branch channel service after multipath is merged is reduced to channel service;
Step 208,209, because the value of SF is the minimum SF value of estimating and be less than or equal to channel, so the professional demodulation after the demodulation for the first time is incomplete, carry out the demodulation second time according to the value of the true SF business after to the demodulation first time, promptly business is carried out separating the second time spread spectrum, finally draw demodulation result, the i.e. result of this base band data service signal for the second time.
Carrying out separating timing the first time, the business that service needed will be separated behind the spread spectrum is carried out channel estimating and multipath (RAKE) merging by minute channel, channel estimating that this is professional and multipath (RAKE) are incorporated among the RAM, the present invention takes static RAM management method, the DPCH channel is split, and is several minutes channels with a DPCH channel distribution, and each divides the flow of channel all is 80symbol, as shown in Table 1, table one splits the signal table for dividing channel:
Table one
It is as shown in the table, and the space of RAM is divided into the channel that several capacity are 80symbol, and when the value of estimating as SF was 32, a former channel still was a branch channel, promptly 0,1,2 ..., 79; When the value of estimating as SF was 16, a former channel was divided into two branch channels, be respectively 0,2,4 ..., 158 and 1,3,5 ..., 159; When the value of estimating as SF was 8, a former channel was divided into four branch channels, be respectively 0,4,8 ..., 316,1,5,9 ..., 317,2,6,10 ..., 318 and 3,7,11 ..., 319; When the value of SF estimation is 4, a former channel is divided into eight branch channels, be respectively 0,8,16 ..., 632,1,9,17 ..., 633,2,10,18 ..., 634,3,11,19 ..., 635,4,12,20 ..., 636,5,13,21 ..., 637,6,14,22 ..., 638 and 7,15,23 ..., 639; When business is stored, storing business into each respectively divides in the channel, RAM divides channel number according to the value of estimating a SF needs, and do not need to determine the capacity of each channel according to the value of estimating SF, the data capacity of each channel is 80symbol, this method makes the channel configuration algorithm obtain simplifying, and has reduced resource fragmentation and has improved resource utilization.
Therefore professional data service after must reverting to complete demodulation behind the undue channel demodulation must have two information that a minute channel is confirmed, one is the branch channel position of this minute channel; Another is the main branch channel designator under this minute channel, and promptly dividing channel position is the channel designator of 0 branch channel.Simple and string conversion recovers data result after the complete demodulation according to these two information utilizations in the WCDMA system, and as shown in Figure 3, Fig. 3 splits schematic diagram for the present invention divides channel, below is 4 to be illustrated with SF, and its detailed process is:
When SF is 4, a former channel is split as eight branch channels, first minute channel, be that SF=4pos=0 divides channel to be called the main channel that divides, SF=4pos=0 divides the data service output timing of channel than leading 1 symbol of the data service output timing of SF=4pos=1 channel, same, SF=4pos=1 divides the data service output timing of channel than leading 1 symbol of the data service output timing of SF=4pos=2 channel, each divides the business datum output timing of channel is the phase place of this minute channel, be referred to as the branch channel position, as seen from Figure 3, each divides the phase place of channel can not repeat, and has guaranteed to divide the uniqueness of channel for value;
When SF is 8,16 or 32, situation and SF be 4 o'clock identical, but the branch number of channel that splits is inequality.
Introduce after the notion of dividing channel, just make the channel configuration algorithm obtain simplifying, according to different expectation SF a complete channel is divided into several minutes channel, each divides channel all to need to carry out computings such as channel estimating, all needs DPCCH information.So each divides channel independently to be DPCCH.Under normal circumstances, each minute channel all be to open simultaneously, close simultaneously, each parameter also is on all four, so DPCCH separate the spread spectrum result and channel estimation results also will be on all four.
For an embodiment this method is described, the value of estimating SF is 16, to the business of a frame in the DPCCH demodulation, the business of this frame is carried out DPDCH demodulation for the first time according to the value of estimating SF, the result in order of the demodulation first time is deposited in the branch channel, the business of this frame obtains the professional real SF of this frame after the DPCCH demodulation be 32, be 2 times that estimate the SF value, the business that deposits the branch channel in is carried out DPDCH demodulation for the second time again according to the value of true SF, promptly the service traffics of two branch channels are incorporated a branch channel into, branch channel after the demodulation is reduced to former channel, obtains final demodulation result.
The present invention adopts and separates spectrum spreading method twice, can only store the first time of several time slots and separate the spread spectrum result, and prior art need be stored the base band data of a frame in advance, so reduced taking of RAM, has avoided plug-in memory; This method can be separated spread spectrum, channel estimating, RAKE merging or the like processing to DPCCH and DPDCH channel synchronization, makes baseband signal by being input to demodulation result output, can become about delay 15ms of the present invention about the delay 23ms by prior art.The method that adopts channel to split makes the very big DPDCH channel of data traffic difference be converted into the fixing branch channel of several data traffics, makes the demodulation process unanimity, has simplified the process of channel configuration, and resource utilization improves a lot, and has obtained good effect.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1, a kind of uplink demodulation method to the different rates business, this method comprises, broadband CDMA system carries out demodulation to business in the ascending physical signal Dedicated Control Channel, obtain the transformat combination indicated value, query transmission format combination indicated value draws real spreading factor value, it is characterized in that this method also comprises:
A, in the ascending physical signal Dedicated Control Channel, the data business carried out demodulation and obtains true spreading factor value in, in the ascending physical signal dedicated data channel according to the spreading factor value that is provided with, form according to minute channel, the data business is carried out separating the first time spread spectrum, channel estimating and multipath to be merged, branch channel service after the multipath merging is reduced to channel service, and stores the demodulation intermediate object program of a frame;
B, the demodulation intermediate object program of the described frame of steps A is carried out separating spread spectrum the second time, obtain the ascending physical signal dedicated data channel demodulation result of a frame with real spreading factor value.
2, the method for claim 1 is characterized in that, the spreading factor value of the described setting of steps A is not more than the minimal frequency spreading factor value of uplink physical channel.
3, method as claimed in claim 1 or 2 is characterized in that, the described spreading factor value that is provided with further comprises:
The minimal frequency spreading factor value of uplink physical channel is 4, and the value that spreading factor is set is 4;
The minimal frequency spreading factor value of uplink physical channel is 8, and the value that spreading factor is set is 8;
The minimal frequency spreading factor value of uplink physical channel is 16, and the value that spreading factor is set is 16;
The minimal frequency spreading factor value of uplink physical channel is 32,64,128 and 256, and the value that spreading factor is set is 32.
4, the method for claim 1, it is characterized in that, the described ascending physical signal dedicated data channel of step B demodulation result is according to the demodulating data service traffics storage of channel one time slot, and the demodulating data service traffics of described channel one time slot are to determine according to the spreading factor value that is provided with.
5, method as claimed in claim 4 is characterized in that, this method also comprises:
It is 4 o'clock that the spreading factor value is set, and the demodulating data service traffics of a time slot of a channel are 640symbol;
It is 8 o'clock that the spreading factor value is set, and the demodulating data service traffics of a time slot of a channel are 320symbol;
It is 16 o'clock that the spreading factor value is set, and the demodulating data service traffics of a time slot of a channel are 160symbol;
It is 32 o'clock that the spreading factor value is set, and the demodulating data service traffics of a time slot of a channel are 80symbol.
6, the method for claim 1 is characterized in that, described form according to minute channel is carried out separating the first time spread spectrum, channel estimating and multipath to baseband signal and merged, and the process that the branch channel service after multipath is merged is reduced to channel service is:
A1, in such a way is provided with spreading factor, and a channel is split as several minutes channel:
One is provided with spreading factor is 4 channel, is split as 8 branch channels, and its position number is respectively 0～7;
One is provided with spreading factor is 8 channel, is split as 4 branch channels, and its position number is respectively 0～3;
One is provided with spreading factor is 16 channel, is split as 2 branch channels, and its position number is respectively 0～1;
One is provided with spreading factor is that 32 channel is split as 1 branch channel, and its position number is 0;
A2, carry out separating the first time steps such as spread spectrum, channel estimating, multipath merging according to minute channel;
A3, after multipath merges, according to the position number and the main branch channel designator of minute channel will belong to a channel each minute channel demodulation intermediate object program revert to the demodulation intermediate object program of complete channel in order.
7, method as claimed in claim 6, it is characterized in that, described main the branchs channel designator process that is provided with under the branch channel is: the position number of a channel is that 0 branch channel is exactly the main channel that divides of this channel, main Channel Elements sequence number of dividing channel be exactly this channel all divide master's branch channel designator of channels.
8, method as claimed in claim 6 is characterized in that, this method also comprises: divide channel for each the ascending physical signal Dedicated Control Channel is set, and utilize this ascending physical signal Dedicated Control Channel to carry out channel estimating.
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101064588B (en) * | 2006-04-30 | 2010-08-18 | 中兴通讯股份有限公司 | Compressing mode transmission control method in uplink enhancement dedicated channel |
| CN101401319B (en) * | 2006-11-09 | 2012-03-28 | 中兴通讯股份有限公司 | A WCDMA system based RAKE receiver set and method |
| CN101102123B (en) * | 2007-07-03 | 2010-04-21 | 中兴通讯股份有限公司 | Mixing service RAKE receiving device based on broadband CDMA system and its method |
| CN101217305B (en) * | 2008-01-02 | 2011-05-04 | 华为技术有限公司 | A processing method and device of data in special physical data channel |
| CN102013898B (en) * | 2009-09-04 | 2013-12-04 | 中兴通讯股份有限公司 | Uplink demodulating method and device based on wideband code division multiple access |
| CN104221314A (en) * | 2013-03-22 | 2014-12-17 | 华为技术有限公司 | Control information transmission method and user device |
| CN110719243B (en) * | 2019-12-12 | 2020-04-17 | 上海磐启微电子有限公司 | Adaptive demodulation method and device for linear frequency modulation signal |
| CN113098557B (en) * | 2021-06-10 | 2021-09-07 | 北京全路通信信号研究设计院集团有限公司 | Method and system for carrying out data negotiation based on data frame |
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