CN101502006B - A multi-user interference cancellation RAKE receiver device and method - Google Patents
A multi-user interference cancellation RAKE receiver device and method Download PDFInfo
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- CN101502006B CN101502006B CN2007800291414A CN200780029141A CN101502006B CN 101502006 B CN101502006 B CN 101502006B CN 2007800291414 A CN2007800291414 A CN 2007800291414A CN 200780029141 A CN200780029141 A CN 200780029141A CN 101502006 B CN101502006 B CN 101502006B
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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
- H04B1/7103—Interference-related aspects the interference being multiple access interference
- H04B1/7107—Subtractive interference cancellation
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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
Abstract
A multi-user interference cancellation RAKE receiver device in a broadband CDMA system additionally includes an interference reconstruction unit (210) and an interference elimination unit (211) on the basis of traditional RAKE receivers. The interference reconstruction unit (210) carries out interference reconstruction for the user data which has a spread spectrum factor less than or equal to the first threshold and then obtains interference data equal to the sampling rate of initial antennae data. The interference elimination unit (211) compares the delay controlled initial antennae data (208) received by antennae data delay control unit (202) with the interference data, makes a subtraction, obtains interference canceled antennae data (207) and sends it to the antennae data delay control unit (202). The data is delay controlled and used to demodulate other non-highspeed uplink data service users.
Description
Technical field
The present invention relates to broadband CDMA system (WCDMA; Wide Band Code-DivisionMultiple Access) the up reception technique of BBP of base station relates in particular to the up reception in base station and supports RAKE receiver hardware implement device and method of work thereof under the high-speed data service situation.
Background technology
In the WCDMA wireless communication system,, therefore, receive usually and adopt the RAKE receiver device because the spacing wireless transmission environment is complicated and abominable.As shown in Figure 1, shown to comprise the structure of the RAKE receiver device of traditional base station BBP: antenna data time-delay control unit, RAKE demodulating unit, control channel symbol processing unit, data channel symbol high specific merge cells.
RAKE receiver is when work, and the antenna data of input is directly inputted to antenna data time-delay control unit; Antenna data time-delay control unit is delivered to the RAKE demodulating unit through the time-delay of control antenna data with antenna data.
The RAKE demodulating unit; The antenna data through delay process that antenna data time-delay control unit is sent here carries out descrambling and de-spreading; At the RAKE demodulating unit respectively to Dedicated Physical Control Channel (DPCCH; Dedicated Physical Control Channel) and Dedicated Physical Data Channel (DPDCH, DedicatedPhysical Data Channel) carry out multi-path demodulation.Wherein, Dedicated Physical Control Channel is exported to control channel symbol processing unit through obtaining user's control channel symbol data after the multi-path demodulation; Dedicated Physical Data Channel obtains user's data channel symbol data through after the multi-path demodulation, exports to data channel symbol high specific merge cells.
Control channel symbol processing unit; The control channel symbol data is carried out channel estimating and TFCI (transport format combination indicator; Transport Format Combination Indicator) decoding is handled, and produces the channel estimation value of every multipath, and carries out the spreading factor (SF that TFCI decoding obtains each user's reality; Spreading Factor), channel estimating and TFCI decode results are exported to data channel symbol high specific merge cells.
Data channel symbol high specific merge cells; Channel estimation value of sending here according to control channel symbol processing unit and actual spreading factor SF; Each user's data channel symbol of sending here after the demodulation of RAKE demodulating unit accomplished carries out channel compensation, and merging adds up with high specific, obtains the data symbol of final data channel.
For the WCDMA system, it is an interference-limited system.
Professional for general ascending voice, because spreading factor bigger (general SF＞=64) uses traditional RAKE receiver just can obtain satisfied performance, the transmitting power of corresponding travelling carriage does not need very high, and therefore, more user can be supported in the base station.
But for upstream data service; Especially HSUPA (the high speed uplink data service of R6 agreement proposition; High Speed Uplink Packet Access); Spreading factor very little (SF＜=4), mobile phone need higher transmitting power to guarantee that the base station adopts traditional RAKE receiver can receive the information of mobile phone.When the traditional RAKE receiver in the base station receives the HSUPA customer service; Because of mobile phone signal adopts high transmit power; And other non-HSUPA customer service signal (for example ascending voice is professional) is less relatively because of power, and other user can ignore the interference that the HSUPA customer service is separated timing relatively.
But this moment; The HSUPA signal of this mobile phone has accounted for bigger part in the aerial signal that whole base station receives; When traditional RAKE receiver other non-HSUPA user's business is separated timing, can cause bigger interference, cause other user's signal to be disturbed and flood; Like this; Other user must also will strengthen transmitting power could let the base station receive these users' information, constantly rises above system tolerance limited subscriber number thereby final result is total power, and the number of users that causes system to support descends.
In a word, for the base station equipment of traditional RAKE receiver device, when the user of high speed uplink data service occurs, can have a strong impact on other users' normal use, the number of users that causes inserting reduces, even can't insert.Therefore, need the device that can reduce the high-speed data service user, avoid or alleviate owing to disturb the power ramp that causes and the situation of number of users decline to other user's interference.
Summary of the invention
Technical problem to be solved by this invention is; The multi-user interference cancellation RAKE receiver device and the method for work thereof of a kind of WCDMA system are provided; In order to offset the interference of high speed uplink data service user to other non-high speed uplink data service user; There is the number of users under the WCDMA high speed uplink data service situation in assurance, overcomes traditional RAKE receiver and when the high speed uplink data service, other user is caused the shortcoming of disturbing and causing number of users sharply to reduce.
The present invention provides a kind of multi-user interference cancellation RAKE receiver device of broadband CDMA system; Comprise the RAKE demodulating unit, this RAKE demodulating unit links to each other with antenna data time-delay control unit, control channel symbol processing unit, data channel symbol high specific merge cells respectively, simultaneously; Control channel symbol processing unit also links to each other with data channel symbol high specific merge cells; Characteristics are that this device also comprises interference reconstruction unit and interference cancellation unit, wherein:
Interference reconstruction unit; Link to each other with data channel symbol high specific merge cells, control channel symbol processing unit respectively; Receive high speed uplink data service user's data channel data symbol from data channel symbol high specific merge cells; The spreading factor that carries according to said data symbol is judged this user, and whether needs disturb reconstruct; When spreading factor is less than or equal to first threshold,, this user's data channel data symbol is disturbed reconstruct according to the user's scrambler and the channelization code information that receive from control channel symbol processing unit; Obtain the interfering data the same and export interference cancellation unit to, carry out the symbol level processing otherwise directly export this user's data channel data symbol with the antenna data sample rate;
Interference cancellation unit; Receive initial antenna data from antenna data time-delay control unit, and subtract each other after interfering data from interference reconstruction unit output aligns, obtain to remove the antenna data of interference from antenna; Deliver to antenna data time-delay control unit, be used for other user's RAKE demodulation.
Further, in the RAKE receiver device according to the invention:
Said antenna data time-delay control unit; Be used for the control of delaying time together of the initial antenna data that receive from antenna and the antenna data after process the multi-user interference elimination that said interference cancellation unit receives; Initial antenna is sent to the RAKE demodulating unit be used for the demodulation of high speed uplink data service user's data, the antenna data after the interference eliminated is sent to the RAKE demodulating unit be used for other non-high speed uplink data service user's data demodulation;
Said RAKE demodulating unit; The antenna data antenna data that control unit sends here of delaying time is carried out multi-path demodulation; Obtain the data symbol of different user, give control channel symbol processing unit and data channel symbol high specific merge cells according to user's control channel data symbol and data channel signal symbol respectively;
Said control channel symbol processing unit; Be used for each user's of receiving from the RAKE demodulating unit control channel data symbol is handled; Produce the channel estimation value of every multipath and carry out transport format combination indicator decoding and obtain the actual spreading factor of each user; Channel estimation value and spreading factor are delivered to data channel symbol high specific merge cells, give interference reconstruction unit each high speed uplink data service user's scrambler and channelization code information;
Said data channel symbol high specific merge cells; Channel estimation value of sending here according to control channel symbol processing unit and actual spreading factor; Each user's data channel data symbol of sending here after the demodulation of RAKE demodulating unit accomplished carries out channel compensation, and merging adds up with high specific; Obtain the data symbol of final data channel, each high speed uplink data service user's data channel data symbol is delivered to interference reconstruction unit.
Further, said interference reconstruction unit comprises: comparator; Accumulator, pulse shaping filter, interpolation filter; And between comparator and accumulator with each user first multiplier, second multiplier, scrambler and channel code generation module one to one, wherein:
Comparator; Be used to receive the data symbol of each user's data channel of high speed uplink data service; Whether needs disturb reconstruct to judge this user according to each user's actual spreading factor, when spreading factor is less than or equal to first threshold, send into the first corresponding multiplier of this user; Otherwise the data symbol of directly exporting this user's data channel carries out symbol level to be handled;
First multiplier carries out multiplying to the data symbol of the data channel that receives from comparator and this user's channel estimating parameter, and the data symbol that obtains having channel information is sent into second multiplier;
Scrambler and channel code generation module, according to spreading factor, scrambler and the channel code parameter of this user's who receives from control channel symbol processing unit reality, the scrambler and the channel code that produce this user are sent into second multiplier;
Second multiplier; Scrambler and channel code according to this user who receives from scrambler and channel code generation module; To the said data symbol that has channel information that receives from first multiplier; Add the multiplying of expanding scrambling, export chip data to the said accumulator of this user's the information of taking a message;
Accumulator adds up to the chip data of the information of taking a message that receives from the second corresponding multiplier of each user of high speed uplink data service, and the chip data of the information of taking a message that obtain all users' reconstruct export said pulse shaping filter to;
Pulse shaping filter to the chip data of the information of taking a message of all high speed uplink data service users' of receiving reconstruct, carries out pulse shaping and handles, and delivers to interpolation filter;
Insert in the chip data of the information of taking a message of all users' after interpolation filter, paired pulses be shaped to be handled reconstruct are carried out and handle, obtain the interfering data with the actual identical sampling rate of initial antenna data of user, export interference cancellation unit to.
Further; Said interference reconstruction unit; Receive the data symbol of high speed uplink data service user's data channel from data channel symbol high specific merge cells; When judging this user according to wherein spreading factor whether needs disturb reconstruct,, spreading factor is used for the symbol level processing if, then directly exporting the data symbol of user's data channel greater than first threshold.
Further, the first threshold of said spreading factor equals 4.
Further, said interference cancellation unit comprises delayer and subtracter, wherein:
Delayer is used for to delaying time from the initial antenna data of antenna end input these initial antenna data being alignd with the interfering data that receives from interference reconstruction unit;
Subtracter; Be used for the interfering data that the initial antenna data and the interference reconstruction unit through the time-delay alignment of common input are exported is carried out subtraction; Output is delivered to antenna data time-delay control unit and is used for other non-high speed uplink data service user's data demodulation through removing the antenna data that high speed uplink data service signal disturbs.
The present invention also provides a kind of method of work based on above-mentioned multi-user interference cancellation RAKE receiver device, comprises the steps:
(1) to initial antenna data from antenna; After antenna data time-delay control unit time-delay control; Send into RAKE demodulating unit, control channel symbol processing unit, the processing of data channel symbol high specific merge cells; Obtain the channel estimation value of every multipath, actual spreading factor, each user's scrambler and channelization code information at control channel symbol processing unit; Obtain the data symbol of high speed uplink data service user's data channel at data channel symbol high specific merge cells, send into interference reconstruction unit;
(2) by interference reconstruction unit the data symbol that the spreading factor of importing is less than or equal to the high speed uplink data service user data channel of first threshold is disturbed reconstruct, obtain the interfering data the same and deliver to interference cancellation unit with the initial antenna data sampling rate;
(3) receive initial antenna data by interference cancellation unit through time-delay control; With subtract each other after interfering data from interference reconstruction unit output aligns; Acquisition is removed the antenna data of interference and is delivered to antenna data time-delay control unit, and the RAKE demodulation that after time-delay control, is used for other user is used.
Further, further comprise in the step (1):
(1-1), send to the RAKE demodulating unit by of the initial antenna data time-delay control of antenna data time-delay control unit to receiving from antenna;
The initial antenna data of (1-2) by the RAKE demodulating unit antenna data time-delay control unit being sent here are carried out multi-path demodulation; Obtain the data symbol of different user, give control channel symbol processing unit and data channel symbol high specific merge cells according to user's control channel data symbol and data channel signal symbol respectively;
(1-3) each user's of receiving from the RAKE demodulating unit control channel data symbol is handled by control channel symbol processing unit; Produce the channel estimation value of every multipath and carry out transport format combination indicator decoding and obtain the actual spreading factor of each user; Channel estimation value and spreading factor are delivered to data channel symbol high specific merge cells, give interference reconstruction unit each high speed uplink data service user's scrambler and channelization code information;
The channel estimation value and actual spreading factor (1-4) sent here according to control channel symbol processing unit by data channel symbol high specific merge cells; Each user's data channel data symbol of sending here after the demodulation of RAKE demodulating unit accomplished carries out channel compensation, and merging adds up with high specific, and the data symbol that obtains high speed uplink data service user's data channel is delivered to interference reconstruction unit.
Further, further comprise in the step (2):
Utilize comparator to receive the data symbol of each user's data channel, wherein actual spreading factor and first threshold compared, when spreading factor during greater than first threshold; Directly export the data symbol of this user's data channel; Otherwise, utilize the first corresponding multiplier of this user, the data symbol of the data channel that receives and this user's channel estimating parameter are carried out multiplying; Obtain having the data symbol of channel information, the value of wherein said first threshold is 4;
According to spreading factor, scrambler and the channel code parameter of this user's who receives from control channel symbol processing unit reality, through scrambler and the channel code of scrambler with this user of channel code generation module generation;
Scrambler and channel code according to this user who receives from scrambler and channel code generation module; By the said data symbol that have channel information of second multiplier to receiving from first multiplier; Add the multiplying of expanding scrambling, the chip data of the information of taking a message of exporting this user are to accumulator;
Utilize accumulator that the chip data of the information of taking a message that receives from the second corresponding multiplier of each user are added up, the chip data of the information of taking a message that obtain all users' reconstruct export pulse shaping filter to;
Utilize the chip data of pulse shaping filter, carry out pulse shaping and handle, deliver to interpolation filter the information of taking a message of all users' of reception reconstruct;
Insert in the chip data of the information of taking a message of all users' after utilizing the interpolation filter paired pulses be shaped to handle reconstruct are carried out and handle, obtain the interfering data with the actual identical sampling rate of antenna data of user, export interference cancellation unit to.
Further, further can be divided in the said step (3):
Utilize delayer that the initial antenna data from antenna end input are delayed time, the antenna data of this input is alignd with interfering data from the interference reconstruction unit reception;
The antenna data after utilizing subtracter to the time-delay alignment of common input and the antenna interference data of interference reconstruction unit output are carried out subtraction; Output is through removing the antenna data that high speed uplink data service signal disturbs; Deliver to antenna data time-delay control unit, after time-delay control, be used for other non-high speed uplink data service user's RAKE demodulation.
Multi-user interference cancellation RAKE receiver device of the present invention; On the basis of traditional RAKE receiver device; When having increased the high speed uplink data service as other user's interference; Disturb the function of reconstruct and Interference Cancellation, the antenna data after the Interference Cancellation is used for other non-HSUPA user's RAKE demodulation.Thereby improved traditional RAKE receiver when the high speed uplink data service exists, other user can't insert or the bad shortcoming of access performance.And the present invention only increases a small amount of high speed uplink data service user's interference reconstruct and interference eliminated function when realizing, control realizes fairly simple, be convenient to realize and the use hardware resource less.
In a word; Compare traditional RAKE receiver; Though increased some hardware resources; But improved the up receptivity in base station, guaranteed that the interference between high speed uplink data service user and other user is minimum, avoided causing access customer number to reduce or even problem such as can't inserting because of disturbing to increase.
Summary of drawings
Fig. 1 is the structural representation of RAKE receiver device traditional in the WCDMA system;
Fig. 2 is a multi-user interference cancellation RAKE receiver schematic representation of apparatus in the embodiment of the invention;
Fig. 3 is the interference reconstruction unit structure chart in the multi-user interference cancellation RAKE receiver device in the embodiment of the invention;
Fig. 4 is the interference cancellation unit structure chart in the multi-user interference cancellation RAKE receiver device in the embodiment of the invention.
Preferred embodiments of the present invention
Below in conjunction with accompanying drawing and specific embodiment technical scheme of the present invention is explained further details.
When inserting the high speed uplink data service, other user (non-high speed uplink data service user) is caused the shortcoming of disturbing and causing number of users sharply to reduce in order to overcome traditional RAKE receiver; There is the number of users under the WCDMA high speed uplink data service situation in assurance, and present embodiment provides a kind of RAKE receiver device of the multi-user interference cancellation based on WCDMA.
For a RAKE receiver in the WCDMA system, possibly comprise following three kinds of situation when inserting the user:
(1) situation of whole right and wrong HSUPA users accesses, so delay time be equivalent to antenna data because interference is 0 this moment, the traditional RAKE access procedure of its access procedure correspondence;
(2) existing HSUPA user has non-HSUPA user's situation again;
Because HSUPA is the E-DCH channel; So it is different with non-HSUPA user's physical channel; Judge when RAKE handles that SF＜=4 are to HSUPA user, use the antenna data of initial input during access, but not HSUPA user's use is through the antenna data after the interference eliminated; So-called interference eliminated is meant disturbing reconstruct as the HSUPA data of disturbing in the antenna data of input at first, deducts the interfering data of reconstruct.
(3) all be HSUPA user's situation;
Can adopt the antenna data of direct input to carry out the RAKE processing.
As shown in Figure 2, provided the structural representation of RAKE receiver device of the multi-user interference cancellation of the WCDMA system that present embodiment provides.This device comprises: antenna data time-delay control unit, RAKE demodulating unit, control channel symbol processing unit, data channel symbol high specific merge cells, interference reconstruction unit, interference cancellation unit.Compare with traditional RAKE receiver device shown in Figure 1, the RAKE receiver device of multi-user interference cancellation shown in Figure 2 has increased interference reconstruction unit and interference cancellation unit newly on traditional RAKE receiver device basic.
RAKE receiving system shown in Figure 2; As high speed uplink data service (HSUPA) when the user inserts; Initial HUSPA customer service and other non-HUSPA customer service (for example speech business customer service) of from the antenna data that antenna end receives, including, said antenna data insert antenna data time-delay control unit.The RAKE receiving system carries out buffer memory to said antenna data; When base station selected access high speed uplink data service user; Because of it has higher access power; Its access be can not influence,, corresponding physical control channel symbol and physical data channel symbol exported so can directly carry out descrambling and de-spreading because of the interference of other non-HSUPA service-user.Otherwise when base station selected other non-HSUPA service-user inserted, the high speed uplink data service then can cause serious interference to the access of other non-HSUPA service-user, and influences other user's access and insert number of users.
Other user is inserted the interference that causes in order to overcome high speed uplink data service user; In the RAKE device in the present embodiment; Interference reconstruction unit is disturbed reconstruct to the data channel symbol of antenna data high speed upstream data service; Send into interference cancellation unit, the antenna data after interference eliminated of last interference cancellation unit output turns back to antenna data time-delay control unit and is used as new antenna data stream, is used for other user's RAKE demodulation.Wherein:
1) interference reconstruction unit at first judges whether to participate in disturbing reconstruct according to the actual SF of HSUPA user, if SF＜=4, then the data symbol to this user's data channel disturbs reconstruct, otherwise does not disturb reconstruct.Disturbing reconstruct is the channel estimating value parameter that the data symbol of HSUPA user data channel multiply by this user, number carries out scrambling according to the SF of this user's reality, user's scrambler number and spreading code then and adds expansion.The data accumulation that last a plurality of user's scrambling adds expansion carries out pulse shaping and interior inserting again as total interference, obtains the interfering data the same with the antenna data sample rate and delivers to interference cancellation unit.
2) interference cancellation unit; It is antenna data (comprising HSUUPA user and non-HSUPA user data) the process time-delay that to import at first; Interfering data with interference reconstruction unit output subtracts each other then; The result removes the antenna data of interference (being non-HSUPA user data); Then, will export the result and flow back to as a kind of antenna data and deliver to antenna data time-delay control unit, and deliver to the RAKE demodulating unit after the time-delay and separate the antenna data that calls as other user's (non-high speed uplink data service user) RAKE.
In said multi-user interference cancellation RAKE receiver device shown in Figure 2, the function of existing each module is following:
Antenna data time-delay control unit; Be used for the antenna data of initial input is carried out the buffer memory delay process; And the antenna data to after eliminating through multi-user interference is controlled together; Carry out antenna data stream numbering jointly, be used for follow-up RAKE demodulating unit, the antenna data after multi-user interference is eliminated sends to follow-up RAKE demodulating unit other non-high speed uplink data service user's antenna data is carried out descrambling and de-spreading;
The RAKE demodulating unit; The antenna data antenna data that control unit sends here of delaying time is carried out multi-path demodulation; Obtain the symbol data of different user, give control channel symbol processing unit and data channel symbol high specific merge cells according to user's control channel and data channel respectively;
Control channel symbol processing unit; Be that each user's who sends here after the RAKE demodulating unit demodulation completion control channel symbol is handled; Produce the channel estimation value of every multipath and carry out TFCI decoding and obtain the actual SF of each user; Give data channel symbol high specific merge cells with these information and be used for the high specific merging, simultaneously, give interference reconstruction unit HSUPA user's scrambler and channelization code information;
Data channel symbol high specific merge cells; Channel estimation value of sending here according to control channel symbol processing unit and actual SF; Each user's data channel symbol of sending here after the demodulation of RAKE demodulating unit accomplished carries out channel compensation, and merging adds up with high specific, obtains the data symbol of final data channel.Give interference reconstruction unit with the data symbol of HSUPA user's final data channel.
Fig. 3 is the structure chart of interference reconstruction unit in the multi-user interference cancellation RAKE receiver device that provides of present embodiment.As shown in Figure 3, said interference reconstruction unit mainly comprises: comparator, multiplier, n cover scrambler and channel code generation module, accumulator, pulse shaping filter and interpolation filter.
In Fig. 3, from the data symbol of each high speed uplink data service user final data channel of data channel symbol high specific merge cells, through the comparator of judging according to this user's SF difference; SF＜=4 o'clock wherein; The data symbol of this user's final data channel gets into next stage through comparator and handles, otherwise, because of SF＞4 o'clock; Interference to other user is less, can directly export and carry out the symbol level processing.
Data symbol through comparator at first carries out multiplying with high speed uplink data service user's channel estimating parameter, obtains having the data symbol of channel information; These data symbols add the multiplying of expanding scrambling then, obtain the chip data of this user's the information of taking a message.Wherein, add the channel code that expands scrambling needs and scrambler from scrambler and channel code generation module, this module is to produce channel code and scrambler according to this user's scrambler number and channel code number these customer parameters.
Multi-user in the interference reconstruction unit is meant the situation that comprises a plurality of HSUPA users in the antenna data of initial reception, and each HSUPA user's data is disturbed reconstruct, obtains the total interfering data of all HSUPA users.
The data symbol of user 1 data channel at first carries out multiplying with user 1 channel parameter; Scrambler and channel code generation module 1 are according to user 1 parameter generating scrambler and channel code simultaneously; User's 1 second corresponding multiplier adds the multiplying of expanding scrambling, obtains the chip data of user 1 the information of taking a message;
The data symbol of user 2 data channel at first carries out multiplying with user 2 channel parameter; Scrambler and channel code generation module 2 are according to user 2 parameter generating scrambler and channel code simultaneously; User's 2 second corresponding multipliers add the multiplying of expanding scrambling, obtain the chip data of user 2 the information of taking a message.
……
The data symbol of the data channel of user n at first carries out multiplying with the channel parameter of user n; Scrambler and channel code generation module n are according to parameter generating scrambler and the channel code of user n simultaneously; Second multiplier that user n is corresponding adds the multiplying of expanding scrambling, obtains the chip data of the information of taking a message of user n.
The antenna data of all HSUPA user's reconstruct adds up at accumulator; Obtain the chip data of the information of taking a message of all users' reconstruct; But this moment, these chip data were 1 times of spreading rates; Different with the antenna data sampling rate of reality, and actual antenna data has also passed through pulse shaping filter.In order to obtain the antenna data of real reconstruct, therefore, HSUPA multi-user's chip data that obtain that add up also need be passed through pulse shaping filter, pass through interpolation filter again, so just can obtain and the actual identical sampling rate of antenna data.So just accomplished the reconstruct of interfering data, the interfering data output of reconstruct is given the interference cancellation unit of back and is carried out interference eliminated.
Fig. 4 is the structure chart of interference cancellation unit in the multi-user interference cancellation RAKE receiver device that provides of present embodiment.Said interference cancellation unit mainly is made up of delayer and subtracter, wherein:
Delayer is used for delaying time the antenna data of antenna end initial input, the antenna interference signal alignment that it and interference reconstruction unit are exported;
The antenna interference signal of initial antenna data after the time-delay and interference reconstruction unit output is imported subtracter jointly and is carried out subtraction; The process exactly of result's output is removed the antenna data that high speed uplink data service signal disturbs; Promptly in eliminating the antenna data that disturbs; No longer comprise high speed uplink data service signal, and only contain non-high speed uplink data service signal, these are eliminated the antenna data that disturbs and turn back to antenna data time-delay control unit; And send into the RAKE demodulation that the RAKE demodulating unit is used for other non-HSUPA service-user, thereby realize reducing the purpose of disturbing.
Based on the RAKE receiver device of above-mentioned multi-user interference cancellation shown in Figure 2, carry out the flow process of multi-user interference cancellation, comprise the steps:
The first step: deliver to antenna data time-delay control unit from the antenna data of antenna initial input; Antenna data time-delay control unit carries out delay process to the antenna data of initial input; To judging of HSUPA and non-HSUPA; The antenna data that will initially insert for HSUPA is delivered to the RAKE demodulating unit and is carried out demodulation, delivers to the RAKE demodulating unit for the antenna data of non-HSUPA after with interference eliminated and carries out demodulation.
Second step: the various antenna datas streams of importing are carried out descrambling and de-spreading by the RAKE demodulating unit; The user's that demodulation is obtained control channel symbol data and data channel symbol data are given control channel symbol processing unit and data channel symbol high specific merge cells respectively;
The 3rd step: the control channel symbol is handled by control channel symbol processing unit; Produce the channel estimation value of every multipath and carry out TFCI decoding and obtain the actual SF of each user; And give data channel symbol high specific merge cells channel estimating and actual SF information, simultaneously each HSUPA user's channel estimating, actual SF, scrambler number, spreading code number these information are issued interference reconstruction unit as channel parameter;
The 4th step: data channel symbol high specific merge cells; Channel estimation value of sending here according to control channel symbol processing unit and actual SF; Each HSUPA user's data channel symbol of sending here after the demodulation of RAKE demodulating unit accomplished carries out channel compensation, and merging adds up with high specific, obtains the data symbol of final data channel and delivers in the interference reconstruction unit;
The 5th step: interference reconstruction unit at first judges whether and need disturb reconstruct to these data symbols that receive; Select the data symbol of the user's data channel of SF＜=4 to multiply by user's channel estimating value parameter; Number carry out scrambling according to the SF of user's reality, user's scrambler number and spreading code then and add expansion; Carry out adding up of multi-user, obtain the data flow the same through pulse shaping filter with interpolation filter then and give interference cancellation unit with the antenna data sample rate; If SF＞4 o'clock, can with this HSUPA user's data symbol directly output carry out symbol level and handle.
The 6th step: interference cancellation unit is delayed time the antenna data of input earlier; Align with the interference signal of interference reconstruction unit output; The interfering data of using the antenna data of importing to deduct input then obtains the antenna data after the interference eliminated, delivers to the RAKE demodulation use that antenna data time-delay control unit is used for other user again.
The high speed uplink data service is as spreading factor SF=2 or 4, especially during SF=2; And owing to the channelization code tree reason causes intersymbol interference very big, intersymbol interference is very big, still between other subscriber channel; Utilize device and method according to the invention; Data to user SF＜=4 of high speed uplink data service are disturbed reconstruct and interference eliminated, after re-entering, are used for other user's RAKE demodulation, can effectively reduce and other non-high speed uplink data service user between intersymbol interference.
In sum; Through increasing Interference Cancellation and disturbing reconstruct; The high speed uplink data service is cancelled as other user's interference; Be used for other user's RAKE demodulation with the antenna data after the Interference Cancellation like this, thereby improved traditional RAKE receiver when the high speed uplink data service exists, other user can't insert or the bad shortcoming of access performance.The present invention has improved the up receptivity in base station, has guaranteed that system still can support the ability than the multi-user under the high speed uplink data service situation.
Industrial applicibility
Multi-user interference cancellation RAKE receiver device disclosed by the invention in the time of can in the WCDMA system, inserting the user of high speed uplink data service, is effectively offset the influence to other users, avoids or alleviate the power ramp and the number of users that cause owing to interference descending.
Claims (10)
1. the multi-user interference cancellation RAKE receiver device of a broadband CDMA system; Comprise the RAKE demodulating unit, this RAKE demodulating unit links to each other with antenna data time-delay control unit, control channel symbol processing unit, data channel symbol high specific merge cells respectively, simultaneously; Control channel symbol processing unit also links to each other with data channel symbol high specific merge cells; It is characterized in that this device also comprises interference reconstruction unit and interference cancellation unit, wherein:
Interference reconstruction unit; Link to each other with data channel symbol high specific merge cells, control channel symbol processing unit respectively; Receive high speed uplink data service user's data channel data symbol from data channel symbol high specific merge cells; The spreading factor that carries according to said data symbol is judged this user, and whether needs disturb reconstruct; When spreading factor is less than or equal to first threshold,, this user's data channel data symbol is disturbed reconstruct according to the user's scrambler and the channelization code information that receive from control channel symbol processing unit; Obtain the interfering data the same and export interference cancellation unit to, carry out the symbol level processing otherwise directly export this user's data channel data symbol with the antenna data sample rate;
Interference cancellation unit; Receive initial antenna data from antenna data time-delay control unit, and subtract each other after interfering data from interference reconstruction unit output aligns, obtain to remove the antenna data of interference from antenna; Deliver to antenna data time-delay control unit, be used for other user's RAKE demodulation.
2. multi-user interference cancellation RAKE receiver device as claimed in claim 1 is characterized in that:
Said antenna data time-delay control unit; Be used for the control of delaying time together of the initial antenna data that receive from antenna and the antenna data after process the multi-user interference elimination that said interference cancellation unit receives; The initial antenna data are sent to the RAKE demodulating unit be used for the demodulation of high speed uplink data service user's data, the antenna data after the interference eliminated is sent to the RAKE demodulating unit be used for other non-high speed uplink data service user's data demodulation;
Said RAKE demodulating unit; The antenna data antenna data that control unit sends here of delaying time is carried out multi-path demodulation; Obtain the data symbol of different user, give control channel symbol processing unit and data channel symbol high specific merge cells according to user's control channel data symbol and data channel signal symbol respectively.
Said control channel symbol processing unit; Be used for each user's of receiving from the RAKE demodulating unit control channel data symbol is handled; Produce the channel estimation value of every multipath and carry out transport format combination indicator decoding and obtain the actual spreading factor of each user; Channel estimation value and spreading factor are delivered to data channel symbol high specific merge cells, give interference reconstruction unit each high speed uplink data service user's scrambler and channelization code information;
Said data channel symbol high specific merge cells; Channel estimation value of sending here according to control channel symbol processing unit and actual spreading factor; Each user's data channel data symbol of sending here after the demodulation of RAKE demodulating unit accomplished carries out channel compensation, and merging adds up with high specific; Obtain the data symbol of final data channel, each high speed uplink data service user's data channel data symbol is delivered to interference reconstruction unit.
3. multi-user interference cancellation RAKE receiver device as claimed in claim 1 is characterized in that said interference reconstruction unit; Comprise: comparator; Accumulator, pulse shaping filter, interpolation filter; And between comparator and accumulator with each user first multiplier, second multiplier, scrambler and channel code generation module one to one, wherein:
Comparator; Be used to receive the data symbol of each user's data channel of high speed uplink data service; Whether needs disturb reconstruct to judge this user according to each user's actual spreading factor, when spreading factor is less than or equal to first threshold, send into the first corresponding multiplier of this user; Otherwise the data symbol of directly exporting this user's data channel carries out symbol level to be handled;
First multiplier carries out multiplying to the data symbol of the data channel that receives from comparator and this user's channel estimating parameter, and the data symbol that obtains having channel information is sent into second multiplier;
Scrambler and channel code generation module, according to spreading factor, scrambler and the channel code parameter of this user's who receives from control channel symbol processing unit reality, the scrambler and the channel code that produce this user are sent into second multiplier;
Second multiplier; Scrambler and channel code according to this user who receives from scrambler and channel code generation module; To the said data symbol that has channel information that receives from first multiplier; Add the multiplying of expanding scrambling, export chip data to the said accumulator of this user's the information of taking a message;
Accumulator adds up to the chip data of the information of taking a message that receives from the second corresponding multiplier of each user of high speed uplink data service, and the chip data of the information of taking a message that obtain all users' reconstruct export said pulse shaping filter to;
Pulse shaping filter to the chip data of the information of taking a message of all high speed uplink data service users' of receiving reconstruct, carries out pulse shaping and handles, and delivers to interpolation filter;
Insert in the chip data of the information of taking a message of all users' after interpolation filter, paired pulses be shaped to be handled reconstruct are carried out and handle, obtain the interfering data with the actual identical sampling rate of initial antenna data of user, export interference cancellation unit to.
4. multi-user interference cancellation RAKE receiver device as claimed in claim 1; It is characterized in that; Said interference reconstruction unit receives the data symbol of high speed uplink data service user's data channel from data channel symbol high specific merge cells, when judging this user according to spreading factor wherein needs disturb reconstruct; If, then directly exporting the data symbol of user's data channel greater than first threshold, spreading factor is used for the symbol level processing.
5. like claim 1 or 3 or 4 described multi-user interference cancellation RAKE receiver devices, it is characterized in that the first threshold of said spreading factor equals 4.
6. multi-user interference cancellation RAKE receiver device as claimed in claim 1 is characterized in that said interference cancellation unit comprises delayer and subtracter, wherein:
Delayer is used for to delaying time from the initial antenna data of antenna end input these initial antenna data being alignd with the interfering data that receives from interference reconstruction unit;
Subtracter; Be used for the interfering data that the initial antenna data and the interference reconstruction unit through the time-delay alignment of common input are exported is carried out subtraction; Output is delivered to antenna data time-delay control unit and is used for other non-high speed uplink data service user's data demodulation through removing the antenna data that high speed uplink data service signal disturbs.
7. the method for work based on the said multi-user interference cancellation RAKE receiver of claim 1 device is characterized in that, comprises the steps:
(1) to initial antenna data from antenna; After antenna data time-delay control unit time-delay control; Send into the RAKE demodulating unit and carry out multi-path demodulation; Obtain the data symbol of different user, give control channel symbol processing unit, data channel symbol high specific merge cells according to user's control channel data symbol and data channel signal symbol respectively, obtain the channel estimation value of every multipath, actual spreading factor, each user's scrambler and channelization code information at control channel symbol processing unit; Obtain the data symbol of high speed uplink data service user's data channel at data channel symbol high specific merge cells, send into interference reconstruction unit;
(2) by interference reconstruction unit the data symbol that the spreading factor of importing is less than or equal to the high speed uplink data service user data channel of first threshold is disturbed reconstruct, obtain the interfering data the same and deliver to interference cancellation unit with the initial antenna data sampling rate;
(3) receive initial antenna data by interference cancellation unit through time-delay control; With subtract each other after interfering data from interference reconstruction unit output aligns; Acquisition is removed the antenna data of interference and is delivered to antenna data time-delay control unit, and the RAKE demodulation that after time-delay control, is used for other user is used.
8. method of work as claimed in claim 7 is characterized in that, step further comprises in (1):
(1-1), send to the RAKE demodulating unit by of the initial antenna data time-delay control of antenna data time-delay control unit to receiving from antenna;
The initial antenna data of (1-2) by the RAKE demodulating unit antenna data time-delay control unit being sent here are carried out multi-path demodulation; Obtain the data symbol of different user, give control channel symbol processing unit and data channel symbol high specific merge cells according to user's control channel data symbol and data channel signal symbol respectively;
(1-3) each user's of receiving from the RAKE demodulating unit control channel data symbol is handled by control channel symbol processing unit; Produce the channel estimation value of every multipath and carry out transport format combination indicator decoding and obtain the actual spreading factor of each user; Channel estimation value and spreading factor are delivered to data channel symbol high specific merge cells, give interference reconstruction unit each high speed uplink data service user's scrambler and channelization code information;
The channel estimation value and actual spreading factor (1-4) sent here according to control channel symbol processing unit by data channel symbol high specific merge cells; Each user's data channel data symbol of sending here after the demodulation of RAKE demodulating unit accomplished carries out channel compensation, and merging adds up with high specific, and the data symbol that obtains high speed uplink data service user's data channel is delivered to interference reconstruction unit.
9. method of work as claimed in claim 7 is characterized in that, step further comprises in (2):
Utilize comparator to receive the data symbol of each user's data channel, wherein actual spreading factor and first threshold compared, when spreading factor during greater than first threshold; Directly export the data symbol of this user's data channel; Otherwise, utilize the first corresponding multiplier of this user, the data symbol of the data channel that receives and this user's channel estimating parameter are carried out multiplying; Obtain having the data symbol of channel information, the value of wherein said first threshold is 4;
According to spreading factor, scrambler and the channel code parameter of this user's who receives from control channel symbol processing unit reality, through scrambler and the channel code of scrambler with this user of channel code generation module generation;
Scrambler and channel code according to this user who receives from scrambler and channel code generation module; By the said data symbol that have channel information of second multiplier to receiving from first multiplier; Add the multiplying of expanding scrambling, the chip data of the information of taking a message of exporting this user are to accumulator;
Utilize accumulator that the chip data of the information of taking a message that receives from the second corresponding multiplier of each user are added up, the chip data of the information of taking a message that obtain all users' reconstruct export pulse shaping filter to;
Utilize the chip data of pulse shaping filter, carry out pulse shaping and handle, deliver to interpolation filter the information of taking a message of all users' of reception reconstruct;
Insert in the chip data of the information of taking a message of all users' after utilizing the interpolation filter paired pulses be shaped to handle reconstruct are carried out and handle, obtain the interfering data with the actual identical sampling rate of antenna data of user, export interference cancellation unit to.
10. method of work as claimed in claim 7 is characterized in that, said step further can be divided in (3):
Utilize delayer to delaying time, the initial antenna data of this input are alignd with the interfering data that receives from interference reconstruction unit from the initial antenna data of antenna end input;
The antenna data after utilizing subtracter to the time-delay alignment of common input and the antenna interference data of interference reconstruction unit output are carried out subtraction; Output is through removing the antenna data that high speed uplink data service signal disturbs; Deliver to antenna data time-delay control unit, after time-delay control, be used for other non-high speed uplink data service user's RAKE demodulation.
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| PCT/CN2007/000532 WO2008098416A1 (en) | 2007-02-14 | 2007-02-14 | A multi-user interference cancellation rake receiver device and method |
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| WO2014075530A1 (en) * | 2012-11-19 | 2014-05-22 | 中兴通讯股份有限公司 | Method, device, and base station for channel interference cancellation |
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| US20130226492A1 (en) * | 2010-10-11 | 2013-08-29 | General Electric Company | Systems, methods, and apparatus for detecting and removing sensor signal impulse disturbances |
| EP2628057A1 (en) | 2010-10-11 | 2013-08-21 | General Electric Company | Systems, methods, and apparatus for detecting shifts in redundant sensor signals |
| CN101986573B (en) * | 2010-10-25 | 2014-03-12 | 中兴通讯股份有限公司 | Spectrum interference canceling device, system and method for dual-mode communication system |
| CN103581076B (en) * | 2012-07-26 | 2017-09-22 | 中兴通讯股份有限公司 | Interference elimination method and device between a kind of baseband board |
| CN110149286A (en) * | 2015-05-11 | 2019-08-20 | 蒋华丽 | The signal processing method of the raising signal-to-noise ratio of digital communication under additive noise environment |
| CN106817205B (en) * | 2015-11-27 | 2020-09-15 | 中兴通讯股份有限公司 | Data scheduling method and device for special physical data channel |
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| US7512199B2 (en) * | 2005-03-01 | 2009-03-31 | Broadcom Corporation | Channel estimation method operable to cancel a dominant disturber signal from a received signal |
| CN1874189B (en) * | 2006-06-29 | 2011-12-21 | 上海宣普实业有限公司 | Method and device for concurrent eliminating same frequency interference in TDS-CDMA |
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