CN101110605A - Rick receiving set for emitter power control data and method thereof - Google Patents

Rick receiving set for emitter power control data and method thereof Download PDF

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Publication number
CN101110605A
CN101110605A CNA2006101032645A CN200610103264A CN101110605A CN 101110605 A CN101110605 A CN 101110605A CN A2006101032645 A CNA2006101032645 A CN A2006101032645A CN 200610103264 A CN200610103264 A CN 200610103264A CN 101110605 A CN101110605 A CN 101110605A
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channel
power control
transmitting power
channel estimation
estimation value
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CN101110605B (en
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周坤
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Shenzhen ZTE Microelectronics Technology Co Ltd
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ZTE Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

The present invention discloses a Rake receiver for transmission power control data, which comprises a descrambling and expansion module, a channel estimation module, a transmission power control data fetch and compensation module and a Rake combination module. In addition, the present invention discloses a Rake receiving method for transmission power control data, which includes detailed processes of descrambling and expansion, channel estimation, channel compensation and Rake combination. The receiver and the receiving method reduce processing time of the transmission power control data, DSP cost and system power consumption.

Description

A kind of rake reception device of transmitting power control data and method
Technical field
The present invention relates to a kind of receiving system and method, relate in particular to a kind of rake reception device and method of transmitting power control data, be used for the digital baseband down link receiving system of WCDMA.
Background technology
In WCDMA digital baseband down link receiving system as shown in Figure 1, by Cell searching/route searching, rake (rake) receives, DSP handles composition.Wherein, the rake of down link receives and comprises: the descrambling and de-spreading of channel, channel estimating/channel compensation, rake merge.
Traditional hardware rake receiving system is handled as shown in Figure 2, receive in the hardware configuration at this rake, the processing time of data needs 512chip at least, be a pair of P-CPICH (Primary CommonPilot Channel, Primary Common Pilot Channel) width of symbol, this is to carry out the needed minimum time of channel estimating, if add the processing of some performance optimizations, the processing time is longer.
DPCH (Dedicated downlink physical channel, downward special physical channel) frame format of channel as shown in Figure 3, TPC among the DPCH (Transmit Power Control, transmitting power control) territory sends over from base station side, be used for carrying out the power control of uplink real-time, the transmission value in TPC territory is complete 0 or complete 1, and the algorithm of its power control has a detailed description in the 3GPP agreement.Rake to TPC receives each time slot of processing requirements once, because the sequential that TPC handles requires very strict, as shown in Figure 4, the 3GPP protocol requirement, receive the TPC data from UE (user equipment, subscriber terminal equipment) down link, to the transmitting power (from pilot data) that changes the UE up link, carry out uplink power control, have only the processing time of 512chip.Therefore, the rake of present TPC receives to handle by dsp software and realizes, promptly extracts the TPC symbol by dsp software from the DPCH channel, handles with the rake reception of software realization TPC then.Because dsp software also will carry out the processing of layer 1 software and the processing of 2/ layer of 3 protocol stack of layer.Therefore to the performance requirement of DSP than higher.
If realize that with hardware this often uses and the functional module of function singleness, can reduce the expense of DSP, reduce the operating frequency of DSP, reduce the power consumption of system, be even more important for the WCDMA terminal.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of rake reception device and method of transmitting power control data, the digital baseband down link receiving system that is used for WCDMA, with processing time that shortens TPC and the expense that reduces DSP, thus the power consumption of reduction system.
In order to solve the problems of the technologies described above, the invention provides a kind of rake reception device of transmitting power control data, comprising:
The descrambling and de-spreading module, be used for carrying out the routing information that Cell searching and route searching obtain according to system, and the scrambler and the spreading code of the channel of upper-layer protocol stack configuration, P-CPICH channel and DPCH channel to each path carry out descrambling and de-spreading, obtain the P-CPICH in each path and the data symbol of DPCH respectively;
Channel estimation module is used to use the data symbol of P-CPICH channel that channel estimating is carried out in each path, obtains the channel estimation value in each path;
The transmitting power control data extracts and compensating module, be used for time slot format information according to the DPCH channel, DPCH channel to each path is separated channel, extracts the transmitting power control data, and uses current channel estimation value that the transmitting power control character is carried out channel compensation;
Rake merges module, is used for the transmitting power control character on each path after the compensation is merged.
Wherein, described descrambling and de-spreading module comprises scrambler generator, spreading code generator and descrambling despreader.
Wherein, described channel estimation module further comprises filter, is used for channel estimation value is carried out filtering the influence of filtering noise.
Wherein, described channel estimation module further comprises interpolation/withdrawal device, is used for that channel estimation value is carried out interpolation/extraction and handles, and makes channel estimation value corresponding one by one with the transmitting power control character, rate-matched.
Wherein, described transmitting power control data extraction and compensating module employed channel estimation value when carrying out channel compensation are the output valve of current channel estimation module.
Wherein, described Rake merges module, adopts maximum the merging than carrying out the merging of transmitting power control character.
Wherein, described Rake merges module when merging, and the transmitting power control data symbol that carries out time slot inside earlier adds up, and the high specific that carries out transmitting power control character between each paths again merges.
In order to solve the problems of the technologies described above, the present invention and then a kind of Rake receiving method of transmitting power control data is provided comprises the steps:
(1) carries out the routing information that Cell searching and route searching obtain according to system, and the scrambler and the spreading code of the channel of upper-layer protocol stack configuration, P-CPICH channel and DPCH channel to each path carry out descrambling and de-spreading, obtain the P-CPICH in each path and the data symbol of DPCH respectively;
(2) use the data symbol of P-CPICH channel that channel estimating is carried out in each path, obtain the channel estimation value in each path;
(3) according to the time slot format information of DPCH channel, to the DPCH in each path, channel is separated channel, extracts the transmitting power control data, and uses current channel estimation value that the transmitting power control character is carried out channel compensation;
(4) the transmitting power control character on each path after the compensation is merged.
Wherein, described step (2) further comprises: channel estimation value is carried out filtering, the influence of filtering noise.
Wherein, described step (2) further comprises: channel estimation value is carried out interpolation/extraction handle, make channel estimation value corresponding one by one with the transmitting power control character, rate-matched.
Wherein, employed channel estimation value is the output valve that current channel estimating obtains in the described channel compensation process of step (3).
Wherein, described step (4) adopts maximum the merging than carrying out the merging of transmitting power control character.
Wherein, in the described step (4), when merging, the transmitting power control data symbol that carries out time slot inside earlier adds up, and the high specific that carries out transmitting power control character between each paths again merges.
Receiving system of the present invention and method, rake reception to TPC adopts hardware to realize fully, according to the specific implementation difference, descrambling and de-spreading module wherein and channel estimation module can also be shared with the rake receiving system of other data, simple in structure, realize that cost is low, very big shortening the processing time of TPC, and reduced the DSP expense, reduced power consumption.
Description of drawings
Fig. 1 is the block diagram of digital baseband down link receiving system among the WCDMA;
Fig. 2 is traditional hardware rake receiving system structural representation;
Fig. 3 is descending DPCH frame format schematic diagram;
Fig. 4 is that the sequential of uplink power control requires schematic diagram;
Fig. 5 is the rake receiving system structural representation of the described a kind of transmitting power control data of the embodiment of the invention;
Fig. 6 is a P-CPICH channel estimating schematic diagram;
Fig. 7 is the TPC compensation image in the traditional rake receiving system;
Fig. 8 is the TPC compensation image in the rake receiving system of the described a kind of transmitting power control data of the embodiment of the invention;
Fig. 9 is the process blocks schematic diagram of the rake method of reseptance of the described a kind of transmitting power control data of the embodiment of the invention;
Figure 10 is the descending TPC receiving system of the UE of a WCDMA structural representation.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
With reference to figure 5, the rake reception device structural representation for the described a kind of transmitting power control data of the embodiment of the invention specifically comprises: descrambling and de-spreading module, channel estimation module, TPC extraction and compensating module, rake merge module.
The descrambling and de-spreading module is used to finish the descrambling and de-spreading process of channel, supports to carry out simultaneously two channels (DPCH, descrambling and de-spreading P-CPICH).The routing information that obtains according to Cell searching and route searching, and the scrambler and the spreading code of the channel of protocol stack sofeware configuration, finish the P-CPICH channel in each path and the descrambling and de-spreading of DPCH channel, obtain the P-CPICH in each path and the data symbol of DPCH respectively.The descrambling and de-spreading module comprises the scrambler generator, spreading code generator and descrambling despreader three parts.
Channel estimation module is used to use the data symbol of P-CPICH channel that channel estimating is carried out in each path, obtains the channel estimation value in each path.Channel estimation module comprises: channel estimation value calculator, channel estimation value filter, interpolation/withdrawal device.
Described channel estimation value calculator according to per two P-CPICH symbols, calculates a channel estimation value, as shown in Figure 6.Its computing formula is as follows:
a 1 = ( r 1 + r 2 ) 2 | A | 2 × A *
a 2 = ( r 1 - r 2 ) 2 | A | 2 × A *
Following formula is the channel estimation value computing formula of even-even symbol;
a 1 = ( r 1 + r 2 ) 2 | A | 2 × A *
a 2 = ( - r 1 + r 2 ) 2 | A | 2 × A *
Following formula is the channel estimation value computing formula of odd number to symbol.
Wherein, a1 and a2 are respectively the channel estimation value of antenna 1 and antenna 2, and r1 and r2 are a pair of CPICH symbol of descrambling and de-spreading module output, A=1+j.When the P-CPICH channel was launched diversity for nothing, the channel estimation value of antenna 2 was 0.
For the noise effect of filtering channel estimation value, just need carry out Filtering Processing to the channel estimation value that calculates, what the channel estimation value filter described in the present embodiment adopted is the FIR filter.
Channel estimation value is carried out obtaining the precise channels estimated value in order to make TPC after the Filtering Processing, and the present invention also carries out interpolation/extraction to channel estimation value and handles.Can use zeroth order to keep interpolation or first-order linear interpolation to the interpolation of channel estimation value.After finishing interpolation/extraction, obtain final channel estimation value, make it corresponding one by one with the TPC symbol, speed is mated fully.And in TPC rake receiving course in the past, channel estimation value not being carried out interpolation/extraction process, the channel estimation value that obtains so often is not very accurate.
TPC extracts and compensating module, is used for the time slot format information according to the DPCH channel, and the DPCH channel in each path is separated channel, extracts corresponding TPC symbol from the DPCH channel, and uses current channel estimation value that the TPC symbol is carried out channel compensation.In general rake receiving course, often data are carried out buffer memory, after wait was calculated with channel estimation value constantly with it, channel data use and it were carried out channel compensation with channel estimation value constantly and are handled, channel value after the compensation that obtains like this can be more accurate, as shown in Figure 7.When TPC of the present invention compensated, because TPC needs fast processing, therefore, the channel estimation value during the TPC compensation used the output valve of current channel estimation module, rather than the channel estimation value in the same moment corresponding with TPC, as shown in Figure 8.Like this, though the channel estimation value that this moment, TPC used is not very accurate, shortened the processing time of TPC greatly.
Rake merges module, is used for the TPC symbol on each path after the compensation is merged.The present invention adopts high specific merging (MRC) to carry out the merging of TPC.Because when carrying out the UE uplink power control, a TPC order only can appear in each time slot in each path, and according to the time slot format of DPCH, each time slot has 8 TPC symbols (16bit) at most, therefore, when the present invention carried out the rake merging, the TPC data symbol that carries out time slot inside earlier added up, the high specific that carries out TPC symbol between each paths again merges, and produces a TPC symbol at last.
With reference to figure 9, be the Rake receiving method process blocks schematic diagram of the described a kind of transmitting power control data of the embodiment of the invention.Detailed process is as follows:
Step 910: descrambling and de-spreading.
Carry out the routing information that Cell searching and route searching obtain according to system, and the scrambler and the spreading code of the channel of upper-layer protocol stack configuration, P-CPICH channel and DPCH channel to each path carry out descrambling and de-spreading, obtain the P-CPICH in each path and the data symbol of DPCH respectively.
Step 920: channel estimating.
Use the data symbol of P-CPICH channel that channel estimation value calculating is at first carried out in each path, adopt the FIR filter to carry out filtering then, at last the channel estimation value that obtains after the filtering is carried out the final channel estimation value that interpolation/extraction obtains each path.
Step 930: channel compensation.
According to the time slot format information of DPCH channel, the DPCH channel in each path is separated channel, extract the TPC symbol, and use current channel estimation value that the TPC symbol is carried out channel compensation.
Step 940:rake merges.
TPC symbol to each path after the compensation carries out adding up in the time slot earlier, and the high specific that carries out again between each path merges, and obtains final TPC symbol.
Below just be treated to example with the descending digital baseband of WCDMA UE, describe the rake receiving course of TPC hardware in detail.Set that TPC is 16bit in the current DPCH time slot format, i.e. 8 TPC symbols.Always have the treatment circuit in 6 paths in the rake receiving system of TPC.With reference to Figure 10, for the descending TPC receiving system of the UE of WCDMA structural representation, by Cell searching/route searching unit, TPC hardware rake receiving system and DSP form.The rake receiving course of descending TPC symbol is as follows:
At first, dsp software is initiated a Cell searching and route searching process, and 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 TPC hardware rake receiving system.
Then, DSP disposes corresponding scrambler for TPC hardware rake receiving system, spreading code information and DPCH time slot format information, and simultaneously, TPC hardware rake device receives the routing information that path searcher module sends over, and begins to carry out descrambling and de-spreading.Obtain P-CPICH channel data and DPCH channel data behind the descrambling and de-spreading in 6 paths.
And channel estimation module uses the P-CPICH channel in 6 paths to carry out channel estimation value to calculate, and filtering obtains the channel estimation value in 6 paths, outputs to TPC and extracts and compensating module.
The DPCH time slot format that TPC extracts and compensating module provides according to DSP carries out the extraction of the TPC data in 6 paths then, all extracts 8 TPC symbols on each path, uses the channel estimation value of the current output of channel estimation module to carry out channel compensation.8 TPC symbols after the compensation are exported in 6 paths respectively then.
Rake as last module in the rake receiving system of TPC merges module, earlier the TPC symbol in each path is handled, and the TPC symbol after the compensation in the same time slot in each path is added up, totally 8 symbols.At this moment, the TPC symbol after each path has only to add up.Then the TPC symbol after the adding up of 6 paths is carried out high specific and merge, obtain a final TPC symbol.
At last this TPC symbol is sent to dsp software, carry out subsequent treatment.
The present invention realizes that with hardware the rake of TPC data receives processing fully, processing time is short, simple in structure, and some hardware resources are (as descrambling and de-spreading, channel estimating etc.) can also share with the rake receiver module of other data, not take the DSP resource substantially, make DSP have sufficient resource to carry out other processing, perhaps can reduce the processing clock of DSP, to reach the purpose of saving power consumption.

Claims (13)

1. the rake reception device of a transmitting power control data is used for the digital baseband down link receiving system of WCDMA, it is characterized in that, comprising:
The descrambling and de-spreading module, be used for carrying out the routing information that Cell searching and route searching obtain according to system, and the scrambler and the spreading code of the channel of upper-layer protocol stack configuration, P-CPICH channel and DPCH channel to each path carry out descrambling and de-spreading, obtain the P-CPICH in each path and the data symbol of DPCH respectively;
Channel estimation module is used to use the data symbol of P-CPICH channel that channel estimating is carried out in each path, obtains the channel estimation value in each path;
The transmitting power control data extracts and compensating module, be used for time slot format information according to the DPCH channel, DPCH channel to each path is separated channel, extracts the transmitting power control data, and uses current channel estimation value that the transmitting power control character is carried out channel compensation;
Rake merges module, is used for the transmitting power control character on each path after the compensation is merged.
2. device as claimed in claim 1 is characterized in that, described descrambling and de-spreading module comprises scrambler generator, spreading code generator and descrambling despreader.
3. device as claimed in claim 1 is characterized in that, described channel estimation module further comprises filter, is used for channel estimation value is carried out filtering the influence of filtering noise.
4. device as claimed in claim 1 is characterized in that, described channel estimation module further comprises interpolation/withdrawal device, is used for that channel estimation value is carried out interpolation/extraction and handles, and makes channel estimation value corresponding one by one with the transmitting power control character, rate-matched.
5. device as claimed in claim 1 is characterized in that, described transmitting power control data extracts and compensating module employed channel estimation value when carrying out channel compensation is the output valve of current channel estimation module.
6. device as claimed in claim 1 is characterized in that, described Rake merges module, adopts maximum the merging than carrying out the merging of transmitting power control character.
7. device as claimed in claim 6 is characterized in that, described Rake merges module when merging, and the transmitting power control data symbol that carries out time slot inside earlier adds up, and the high specific that carries out transmitting power control character between each paths again merges.
8. the Rake receiving method of a transmitting power control data is used for the digital baseband down link receiving system of WCDMA, it is characterized in that, comprising:
(1) carries out the routing information that Cell searching and route searching obtain according to system, and the scrambler and the spreading code of the channel of upper-layer protocol stack configuration, P-CPICH channel and DPCH channel to each path carry out descrambling and de-spreading, obtain the P-CPICH in each path and the data symbol of DPCH respectively;
(2) use the data symbol of P-CPICH channel that channel estimating is carried out in each path, obtain the channel estimation value in each path;
(3) according to the time slot format information of DPCH channel, the DPCH channel in each path is separated channel, extract the transmitting power control data, and use current channel estimation value that the transmitting power control character is carried out channel compensation;
(4) the transmitting power control character on each path after the compensation is merged.
9. method as claimed in claim 8 is characterized in that, described step (2) further comprises: channel estimation value is carried out filtering, the influence of filtering noise.
10. method as claimed in claim 8 is characterized in that, described step (2) further comprises: channel estimation value is carried out interpolation/extraction handle, make channel estimation value corresponding one by one with the transmitting power control character, rate-matched.
11. method as claimed in claim 8 is characterized in that, employed channel estimation value is the output valve that current channel estimating obtains in the described channel compensation process of step (3).
12. method as claimed in claim 8 is characterized in that, described step (4) adopts maximum the merging than carrying out the merging of transmitting power control character.
13. method as claimed in claim 12 is characterized in that, in the described step (4), when merging, the transmitting power control data symbol that carries out time slot inside earlier adds up, and the high specific that carries out transmitting power control character between each paths again merges.
CN2006101032645A 2006-07-20 2006-07-20 Rick receiving set for emitter power control data and method thereof Active CN101110605B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101729090B (en) * 2008-10-10 2012-12-05 中兴通讯股份有限公司 Method for implementing channel estimation and compensation in wideband code division multiple access system and device thereof
CN103297113A (en) * 2012-02-27 2013-09-11 英特尔移动通信有限责任公司 Radio receiver apparatus of a cellular radio network

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1323502C (en) * 2002-06-19 2007-06-27 上海贝尔有限公司 WCDMA indicating channel receiver
CN1260900C (en) * 2003-11-04 2006-06-21 中兴通讯股份有限公司 Multi-path combining method for WCDMA communication system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101729090B (en) * 2008-10-10 2012-12-05 中兴通讯股份有限公司 Method for implementing channel estimation and compensation in wideband code division multiple access system and device thereof
CN103297113A (en) * 2012-02-27 2013-09-11 英特尔移动通信有限责任公司 Radio receiver apparatus of a cellular radio network
CN103297113B (en) * 2012-02-27 2016-06-29 英特尔移动通信有限责任公司 The radio receiver arrangement of cellular radio network

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Denomination of invention: Rick receiving set for emitter power control data and method thereof

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