CN101502006A - A multi-user interference cancellation RAKE receiver device and method - Google Patents

A multi-user interference cancellation RAKE receiver device and method Download PDF

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CN101502006A
CN101502006A CNA2007800291414A CN200780029141A CN101502006A CN 101502006 A CN101502006 A CN 101502006A CN A2007800291414 A CNA2007800291414 A CN A2007800291414A CN 200780029141 A CN200780029141 A CN 200780029141A CN 101502006 A CN101502006 A CN 101502006A
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data
channel
user
interference
symbol
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CN101502006B (en
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古艳涛
陈月峰
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Shenzhen ZTE Microelectronics Technology Co Ltd
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ZTE Corp
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/711—Interference-related aspects the interference being multi-path interference
    • H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)

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

A multi-user interference cancellation RAKE receiver device and method
The RAKE receiver device and its method of work of a kind of multi-user interference cancellation
Technical field
The present invention relates to broadband CDMA system（WCDMA, Wide Band Code-Division Multiple Access) base station BBP uplink receiving technology, more particularly to base station uplink receiving support high-speed data service in the case of RAKE receiver hardware realization apparatus and its method of work.
Background technology
In WCDMA wireless communication systems, because spacing wireless transmission environment is complicated and severe, therefore, generally receives and use RAKE. receiver apparatus.As shown in Figure 1, it is shown that the structure of the RAKE receiver device of traditional base station BBP, including：Antenna data delays time to control unit, RAKE demodulating units, control channel Symbol processing unit, data channel symbols maximum-ratio combing unit.
Operationally, the antenna data of input is directly inputted to antenna data delays time to control unit to RAKE receiver；Antenna data is sent to RAKE demodulating units by antenna data delays time to control unit by controlling antenna data to be delayed.
RAKE demodulating units, the antenna data through delay process sent to antenna data delays time to control unit carries out descrambling and de-spreading, in RAKE demodulating units respectively to Dedicated Physical Control Channel（DPCCH, Dedicated Physical Control Channel) and Dedicated Physical Data Channel（DPDCH, Dedicated Physical Data Channel) carry out multi-path demodulation.Wherein, Dedicated Physical Control Channel obtains the control channel symbol data of user after passing through multi-path demodulation, exports and gives control channel Symbol processing unit；Dedicated Physical Data Channel obtains the data channel symbols data of user after passing through multi-path demodulation, and, which is exported, gives data channel symbols maximum-ratio combing unit.
Control channel Symbol processing unit, control channel symbol data is subjected to channel estimation and TFC transport format combination indicators, Transport Format Combination Indicator) decoding processing, produce the channel estimation value of every multipath, and carry out the spreading factor (SF that TFCI decodings obtain each user's reality, Spreading Factor), channel estimation and TFCI decodings result are exported and give data channel symbols maximum-ratio combing unit.
Data channel symbols maximum-ratio combing unit, the channel sent according to control channel Symbol processing unit Estimate and actual spreading factor SF, the data channel symbols progress channel compensation and maximum-ratio combing that RAKE demodulating units are demodulated to each user sent after completing add up, and obtain the data symbol of final data channel.
For WCDMA system, it is an interference-limited system.
For general uplink voice traffic, because spreading factor is than larger（General SF>=64), satisfied performance is can be obtained by using conventional rake receiver, the transmission power of correspondence mobile station need not be very high, and therefore, base station can support more user.
But for upstream data service, for the HSUPA (high speed uplink data service, High Speed Uplink Packet Access) that especially R6 agreements are proposed, spreading factor very little（ SF<=4), mobile phone needs higher transmission power to ensure that base station can receive the information of mobile phone using conventional rake receiver.When the conventional rake receiver of base station is received to HSUPA customer services, because mobile phone signal is used compared with high emission power, and other non-HSUPA customer services signals（Such as uplink voice traffic）Because power is relatively small, interference when other users demodulate to HSUPA customer services can be ignored relatively.
But now, the HSUPA signals of the mobile phone account for larger part in the aerial signal that whole base station is received, when conventional rake receiver is demodulated to the business of other non-HSUPA users, larger interference can be caused, cause the signal of other users disturbed and flood, so, other users must will also increase the information that transmission power could allow base station to receive these users, final result, which is that total power is constantly soaring, to be exceeded system tolerance to limit number of users, causes the number of users that system is supported to decline.In a word, for the base station equipment of conventional rake receiver device, when the user of high speed uplink data service occurs, the normal of other users can be had a strong impact on and used, cause the number of users reduction of access, or even can not accessed.Accordingly, it would be desirable to which one can reduce device of the high-speed data service user to the interference of other users, it is to avoid or mitigate due to the situation that power ramp caused by interference and number of users decline.The content of the invention technical problems to be solved by the invention are, the multi-user interference cancellation RAKE receiver device and its method of work of a kind of WCDMA system are provided, to offset interference of the high speed uplink data service customers to other non-high-speed upstream data service users, it is ensured that there are WCDMA high speed uplink data Number of users under service conditions, overcomes traditional RAKE receiver to be interfered in high speed uplink data service to other users and causes the shortcoming of number of users drastically reduction.
The present invention provides a kind of multi-user interference cancellation RAKE receiver device of broadband CDMA system, including RAKE demodulating units, the RAKE demodulating units are connected with antenna data delays time to control unit, control channel Symbol processing unit, data channel symbols maximum-ratio combing unit respectively, simultaneously, control channel Symbol processing unit is also connected with data channel symbols maximum-ratio combing unit, feature is, the device also includes interference reconstruction unit and interference cancellation unit, wherein：
Interference reconstruction unit, respectively with data channel symbols maximum-ratio combing unit, control channel Symbol processing unit is connected, the data channel signal symbol of high speed uplink data service customers is received from data channel symbols maximum-ratio combing unit, the spreading factor carried according to the data symbol judges whether the user needs to carry out interference reconstruct, when spreading factor is less than or equal to first threshold, according to the user's scrambler and channelization code information received from control channel Symbol processing unit, interference reconstruct is carried out to the data channel signal symbol of the user, interference data output as antenna data sample rate is obtained to interference cancellation unit, otherwise the data channel signal symbol for directly exporting the user carries out symbol level processing；
Interference cancellation unit, the initial antenna data from antenna are received from antenna data delays time to control unit, with being subtracted each other after the interference alignment of data that is exported from interference reconstruction unit, obtain the antenna data for removing interference, antenna data delays time to control unit is sent to, the RAKE for other users is demodulated.
Further, in RAKE receiver device of the present invention：
The antenna data delays time to control unit, antenna data after the process multi-user interference received for the initial antenna data to being received from antenna and from the interference cancellation unit is eliminated carries out delays time to control together, initial antenna is sent into RAKE demodulating units is used for the data demodulation of high speed uplink data service customers, and the antenna data after eliminating will be disturbed to be sent to RAKE demodulating units and demodulated for the data of other non-high-speed upstream data service users；
The RAKE demodulating units, the antenna data that antenna data delays time to control unit is sent carries out multi-path demodulation, the data symbol of different user is obtained, channel data symbols are selected according to the control channel data symbol sum of user respectively and give control channel Symbol processing unit and data channel symbols maximum-ratio combing unit；
The control channel Symbol processing unit, for each use to being received from RAKE demodulating units The control channel data symbol at family 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 sent to data channel symbols maximum-ratio combing unit, interference weight Chinese holly unit is given by the scrambler and channelization code information of each high speed uplink data service customers；
The data channel symbols maximum-ratio combing unit, the channel estimation value and actual spreading factor sent according to control channel Symbol processing unit, the data channel signal symbol progress channel compensation and maximum-ratio combing that RAKE demodulating units are demodulated to each user sent after completing add up, the data symbol of final data channel is obtained, the data channel signal symbol of each high speed uplink data service customers is sent to interference reconstruction unit.
Further, the interference reconstruction unit, including：Comparator, accumulator, pulse shaping filter, interpolation filter, and the first multiplier corresponding with each user one " " ^, the second multiplier, scrambler and channel code generation mould between comparator and accumulator, wherein：
Comparator, for the data symbol for the data channel for receiving each user of high speed uplink data service, just the blunt actual spreading factor according to each user judges whether the user needs to carry out interference reconstruct, when spreading factor is less than or equal to first threshold, send into corresponding first multiplier of the user, otherwise, the data symbol for directly exporting the data channel of the user carries out symbol level processing；
First multiplier, carries out multiplying to the data symbol of data channel and the channel estimation parameter of the user received from comparator, obtains the data symbol with channel information and send into the second multiplier；' scrambler and channel code generation module, according to the actual spreading factor, scrambler and channel code parameter of the user received from control channel Symbol processing unit, the scrambler and channel code for producing the user send into the second multiplier；
Second multiplier, according to the scrambler and channel code from scrambler and the user of channel code generation module reception, to from the first multiplier receive described in carry channel information data symbol, the multiplying of scrambling is carried out plus expanded, the chip data with channel information of the user are exported to the accumulator；
The chip data with channel information received from corresponding second multiplier of each user of high speed uplink data service are added up by accumulator, obtain the chip data output with channel information of reconstruct of all users to the pulse shaping filter；Pulse shaping filter, to the band channel of the reconstruct of all high speed uplink data service customers of reception The chip data of information, carry out pulse shaping processing, deliver to interpolation filter；
Interpolation filter, the chip data with channel information to the reconstruct of all users after spouse at pulse shaping carry out interpolation processing, obtain the interference data of sampling rate identical with the initial antenna data that user is actual, output to interference cancellation unit.
Further, the interference reconstruction unit, the data symbol of the data channel of high speed uplink data service customers is received from data channel symbols maximum-ratio combing unit, when judging whether the user needs to carry out interference reconstruct according to spreading factor therein, if spreading factor is more than the first wealthy value, the data symbol of data channel of user is directly exported for symbol level processing.Further, the first threshold of the frequency factor is equal to 4.
Further, the interference cancellation unit, including delayer and subtracter, wherein：
Delayer, for entering line delay to the initial antenna data inputted from antenna end, by the initial antenna data and the interference alignment of data from interference reconstruction unit reception；Subtracter, for the initial antenna data through delay alignment to inputting jointly subtraction is carried out with the interference data that interference reconstruction unit is exported, the antenna data through removing the interference of high speed uplink data service signal is exported, being sent to antenna data delays time to control unit is used for the data demodulation of other non-high-speed upstream data service users.
The present invention also provides a kind of method of work based on above-mentioned multi-user interference cancellation RAKE receiver device, Bao include Ru Xia Bu Sudden：
(1) to the initial antenna data from antenna, after antenna data delays time to control unit delays time to control, send into RAKE demodulating units, control channel Symbol processing unit, data channel symbols maximum-ratio combing cell processing, channel estimation value, actual spreading factor, the scrambler of each user and the channelization code information of every multipath are obtained in control channel Symbol processing unit, the data symbol of the data channel of high speed uplink data service customers is obtained in data channel symbols maximum-ratio combing unit, interference reconstruction unit is sent into；
(2) data symbol for being less than or equal to the high speed uplink data service customers data channel of first threshold to the spreading factor of input by interference reconstruction unit carries out interference reconstruct, obtains the interference data as initial antenna data sampling rate and is sent to interference cancellation unit；
(3) the initial antenna data by delays time to control are received by interference cancellation unit, with being subtracted each other after the interference alignment of data that is exported from interference reconstruction unit, the antenna data that interference is removed in acquisition is sent to antenna Data delay control unit, the RAKE demodulation for other users after delays time to control is used.
Further, step（1) further comprise：
(1-1) is controlled the initial antenna data delay received from antenna by antenna data delays time to control unit, is sent to RAKE demodulating units；
The initial antenna data that (1-2) are sent by RAKE demodulating units to antenna data delays time to control unit carry out multi-path demodulation, the data symbol of different user is obtained, control channel Symbol processing unit and data channel symbols maximum-ratio combing unit is given according to the control channel data symbol and data channel signal symbol of user respectively；
The control channel data symbol of each user of (1-3) by control channel Symbol processing unit to being received from RAKE demodulating units 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 sent to data channel symbols maximum-ratio combing unit, interference reconstruction unit is given by the scrambler and channelization code information of each high speed uplink data service customers；
Channel estimation value and actual spreading factor that (1-4) are sent by data channel symbols maximum-ratio combing unit according to control channel Symbol processing unit, the data channel signal symbol progress channel compensation and maximum-ratio combing that RAKE demodulating units are demodulated to each user sent after completing add up, and the data symbol for obtaining the data channel of high speed uplink data service customers is sent to interference reconstruction unit.
Further, step（2) further comprise：
The data symbol of the data channel of each user is received using comparator, actual spreading factor therein and first threshold are compared, when spreading factor is more than first threshold, directly export the data symbol of the data channel of the user, otherwise, it is right using corresponding first multiplier of the user;The data symbol for the data channel that Change is received carries out multiplying with the channel estimation parameter of the user, obtains the data symbol with channel information, wherein the value of the first threshold is 4;
According to the actual spreading factor, scrambler and channel code parameter of the user received from control channel Symbol processing unit, the scrambler and channel code of the user is produced by scrambler and channel code generation module；
According to the scrambler and channel code from scrambler and the user of channel code generation module reception, as the second multiplier to from the data symbol for carrying channel information described in the reception of the first multiplier, carrying out plus expanding to add The multiplying disturbed, exports the chip data with channel information of the user to accumulator；Enter Yu to the chip data with channel information received from corresponding second multiplier of each user using accumulator to add up, obtain the chip data output with channel information of reconstruct of all users to pulse shaping filter；
Using chip data with channel information of the pulse shaping filter to the reconstruct of all users of reception, pulse shaping processing is carried out, interpolation filter is delivered to；
Interpolation processing is carried out to the chip data with channel information of the reconstruct of all users after pulse shaping processing using interpolation filter, the interference data of sampling rate identical with the antenna data that user is actual, output to interference cancellation unit are obtained.
Further, the step（3) it can further be divided into：
Line delay is entered to the initial antenna data inputted from antenna end using delayer, by the antenna data of the input and the interference alignment of data from interference reconstruction unit reception；
Antenna data after being alignd using subtracter to the delay inputted jointly carries out subtraction with the antenna interference data that interference reconstruction unit is exported, export the antenna data through removing the interference of high speed uplinks data service signal, antenna data delays time to control unit is sent to, the RAKE for other non-high-speed upstream data service users after delays time to control is demodulated.
The multi-user interference cancellation RAKE receiver device of the present invention, on the basis of conventional rake receiver device, add to high speed uplink data service as other users interference when, the function of interference reconstruct and Interference Cancellation is carried out, the RAKE that the antenna data after Interference Cancellation is used for other non-HSUPA users is demodulated.So as to improve traditional RAKE receiver in the presence of high speed uplink data service, the shortcoming that other users can not access or access performance is bad.And the present invention when realizing, only increase a small amount of high speed uplink data service customers interference reconstruct and interference eliminate function, control realize it is fairly simple, be easy to implement and using hardware resource it is less.
In a word, for conventional rake receiver, although adding some hardware resources, but improve base station uplink receiving performance, it ensure that interference between high speed uplink data service customers and other users is minimum, it is to avoid because access customer number is reduced or can not even accessed caused by disturbing increase the problems such as. Summary of drawings
Fig. 1 is the structural representation of traditional RAKE receiver device in WCDMA system；Fig. 2 is the schematic diagram of multi-user interference cancellation RAKE receiver device in the embodiment of the present invention；Fig. 3 is the interference reconstruction unit structure chart in multi-user interference cancellation RAKE receiver device in the embodiment of the present invention；
Fig. 4 is the interference cancellation unit structure chart in multi-user interference cancellation RAKE receiver device in the embodiment of the present invention.
The better embodiment of the present invention
Below in conjunction with the accompanying drawings and specific embodiment is described in further details to technical scheme.In order to overcome traditional RAKE receiver when accessing high speed uplink data service to other users (non-high-speed upstream data service user）Interfere and cause the shortcoming of number of users drastically reduction, it is ensured that there is the number of users under WCDMA high speed uplink data service requirements, the present embodiment provides a kind of RAKE receiver device of the multi-user interference cancellation based on WCDMA.
For a RAKE receiver in a WCDMA system, following three situation is potentially included during accessing user：
(1) be all non-HSUPA user access situation, now because interference is 0, so equivalent to antenna data delay, its access procedure correspondence tradition RAKE access procedures；
(2) existing HSUPA user has the situation of non-HSUPA user again；
Because HSUPA is E-DCH channels, thus it is different from the physical channel of non-HSUPA user,
Judge SF during RAKE processing<=4 just for HSUPA user, the antenna data initially entered is used during access, rather than HSUPA user uses and disturbs the antenna data after eliminating by thousand, the HSUPA data that so-called interference eliminates in the antenna data for referring to initially enter as interference carry out interference reconstruct, subtract the interference data of reconstruct.
(3) be entirely HSUPA user situation；
RAKE processing can be carried out using the antenna data directly inputted. As shown in Fig. 2 giving the structural representation of the RAKE receiver device of the multi-user interference cancellation of the WCDMA system of the present embodiment offer.The device includes：Antenna data delays time to control unit, RAKE demodulating units, control channel Symbol processing unit, data channel symbols maximum-ratio combing unit, interference reconstruction unit, interference cancellation unit.Compared with the conventional rake receiver device shown in Fig. 1, the RAKE receiver device of the multi-user interference cancellation shown in Fig. 2 has newly increased interference reconstruction unit and interference cancellation unit on conventional rake receiver device basic.
RAKE reception devices shown in Fig. 2, when there is high speed uplink data service（HSUPA when) user accesses, HUSPA customer services and other non-HUSPA customer services are initially included from the antenna data that antenna end is received（Such as speech business customer service）, the antenna data access antenna data delays time to control unit.RAKE reception devices carry out Slow to the antenna data and deposited, when base station selected access high speed uplink data service customers, because it has higher access power, because of the interference of other non-HSUPA service-users it will not be influenceed to access, therefore descrambling and de-spreading can be directly carried out, the corresponding specific physical control channel symbol of output and specific physical data channel symbol.Conversely, when base station selected other non-HSUPA service-users accesses, Yu data services then can cause severe jamming to the access of other HSUPA service-users Shang Gao Su, and influence the access of other users and the quantity of accessing user.
In order to overcome high speed uplink data service customers to access the interference caused to other users, in RAKE devices in the present embodiment, interference reconstruction unit carries out interference reconstruct to the data channel symbols of antenna data high speed upstream data service, send into interference cancellation unit, the antenna data after interference elimination for ultimately interfering with elimination unit output returns to antenna data delays time to control unit as new antenna data stream, and the RAKE for other users is demodulated.Wherein：
1) interference reconstruction unit, carries out judging whether to participate in interference reconstruct first, if SF according to the actual SF of HSUPA user<=4, then interference reconstruct is carried out to the data symbol of the data channel of the user, otherwise reconstructed without interference.Interference reconstruct is the channel estimation value parameter that the data symbol of HSUPA user data channels is multiplied by the user, and then just blunt actual SF, the scrambling code number of user and spreading code number according to the user scramble plus expand.The data accumulation of last multiple user's scramblings plus expansion is as total interference, then carries out pulse shaping and interpolation, obtains the interference data as antenna data sample rate and is sent to interference cancellation unit.
2) interference cancellation unit, is that the antenna data that will be initially entered (includes HSUUPA user and non-HSUPA user data）By delay, the interference data then exported with interference reconstruction unit carry out phase Subtract, be as a result exactly the antenna data for removing interference（I.e. non-HSUPA user data）, then, output result is flowed back to as a kind of antenna data and is sent to antenna data delays time to control unit, RAKE demodulating units are sent to after delay as other users（Non-high-speed upstream data service user）The antenna data that calls of RAKE solutions.
In the multi-user interference cancellation RAKE receiver device shown in Fig. 2, the function of existing modules is as follows：
Antenna data delays time to control unit, Slow, which is carried out, for the antenna data to initial input deposits delay process, and the antenna data after being eliminated by multi-user interference is controlled together, it is common to carry out antenna data stream numbering, for follow-up RAKE demodulating units, the antenna data after multi-user interference is eliminated is sent to follow-up RAKE demodulating units and carries out descrambling and de-spreading to the antenna data of other non-high-speed upstream data service users；
RAKE demodulating units, the antenna data that antenna data delays time to control unit is sent carries out multi-path demodulation, the symbol data of different user is obtained, control channel Symbol processing unit and data channel symbols maximum-ratio combing unit is given according to the control channel and data channel of user respectively；
Control channel Symbol processing unit, it is that the control channel symbol that RAKE demodulating units are demodulated into each user sent after completion is handled, produce the channel estimation value of every multipath and carry out TFCI decodings and obtain the actual SF of each user, giving data channel symbols maximum-ratio combing unit by these information is used for maximum-ratio combing, meanwhile, give interference reconstruction unit by the scrambler and channelization code information of HSUPA user；
Data channel symbols maximum-ratio combing unit, the blunt channel estimation value sent according to control channel Symbol processing unit and actual SF, the data channel symbols progress channel compensation and maximum-ratio combing that RAKE demodulating units are demodulated to each user sent after completing add up, and obtain the data symbol of final data channel.Interference reconstruction unit is given by the data symbol of the final data channel of HSUPA user.
Fig. 3 is the structure chart of interference reconstruction unit in the multi-user interference cancellation RAKE receiver device that the present embodiment is provided.As shown in figure 3, the interference reconstruction unit mainly includes：Comparator, multiplier, n set scramblers and channel code generation module, accumulator, pulse shaping filter and interpolation filter.
In figure3In, each high speed uplink data service from data channel symbols maximum-ratio combing unit The data symbol of the final data channel of user, the comparator judged by the SF differences according to the user, wherein SF<When=4, the data symbol of the final data channel of the user is handled by comparator into next stage, otherwise, because of SF>When 4, the interference to other users is smaller, can directly export progress symbol level processing.
Channel estimation parameter by the data symbol of comparator first with high speed uplink data service customers carries out multiplying, obtains the data symbol with channel information；Then these data symbols carry out plus expanded the multiplying of scrambling, obtain the chip data with channel information of the user.Wherein, plus expand scrambling need channel code and scrambler come from scrambler and channel code generation module, the module is to produce channel code and scrambler according to these customer parameters of the scrambling code number and channel code number of the user.
Thousand disturb the multi-user in reconfiguration unit, refer in the antenna data initially received comprising multiple
HSUPA. the data at every HSUPA families are carried out interference reconstruct, obtain the interference data of all HSUPA users always by the situation of user.
The data symbol of the data channel of user 1 carries out multiplying with the channel parameter of user 1 first, scrambler and channel code generation module 1 produce scrambler and channel code according to the parameter of user 1 simultaneously, corresponding second multiplier of user 1 carries out plus expanded the multiplying of scrambling, obtains the chip data with channel information of user 1；
The data symbol of the data channel of user 2 carries out multiplying with the channel parameter of user 2 first, scrambler and channel code generation module 2 produce scrambler and channel code according to the parameter of user 2 simultaneously, corresponding second multiplier of user 2 carries out plus expanded the multiplying of scrambling, obtains the chip data with channel information of user 2.
The data symbol of user n data channel is first and usernChannel parameter carry out multiplying, scrambler and channel code generation module n produce scrambler and channel code according to user n parameter simultaneously, corresponding second multipliers of user n carry out plus expanded the multiplying of scrambling, obtain the user n chip data with channel information.
The antenna data of all HSUPA user's reconstruct is added up in accumulator, obtain the chip data with channel information of the reconstruct of all users, but now these chip data are 1 times of spreading rates, it is different from actual antenna data sampling rate, and actual antenna data also have passed through pulse shaping filter Ripple device.For the antenna data really reconstructed, therefore, the cumulative obtained chip data of HSUPA multi-user are also needed to by pulse shaping filter, then by interpolation filter, so can be obtained by and actual antenna data identical sampling rate.This completes the reconstruct of interference data, the interference cancellation unit that the interference data output of reconstruct is given below carries out interference elimination.
Fig. 4 is the structure chart of interference cancellation unit in the multi-user interference cancellation RAKE receiver device that the present embodiment is provided.The interference cancellation unit is mainly made up of delayer and subtracter, wherein：
Delayer, for the antenna data of antenna end initial input to be entered line delay, makes it be alignd with the antenna interfering signal that interference reconstruction unit is exported；
The antenna interfering signal that initial antenna data after delay are exported with interference reconstruction unit inputs subtracter and carries out subtraction jointly, as a result what is exported is exactly the antenna data by removing the interference of high speed uplink data service signal, i.e. in the antenna data for eliminating interference, no longer include high speed uplink data service signal, and only contain non-high-speed upstream data service signal, these antenna datas for eliminating interference return to antenna data delays time to control unit, and send into RAKE demodulation of the RAKE demodulating units for other non-HSUPA service-users, so as to realize the purpose of reduction interference.
RAKE receiver device based on the multi-user interference cancellation shown in above-mentioned Fig. 2, carries out the flow of multi-user interference cancellation, comprises the following steps：
The first step：Antenna data delays time to control unit is sent to from the antenna data of antenna initial input, antenna data delays time to control unit carries out delay process to the antenna data of initial input, to judging for HSUPA and non-HSUPA, the antenna data being initially accessed is delivered into RAKE demodulating units for HSUPA to be demodulated, for non-HSUPA the antenna data after eliminating will be disturbed to deliver to RAKE demodulating units and be demodulated.Second step：Descrambling and de-spreading is carried out to the various antenna data streams of input by RAKE demodulating units, the control channel symbol data and data channel symbol data of obtained user will be demodulated, control channel Symbol processing unit and data channel symbols maximum-ratio combing unit are given respectively；
3rd step：Control channel symbol is handled by control channel Symbol processing unit, the channel estimation value of every multipath is produced and carries out TFCI decodings and obtain the actual SF of each user, and channel is estimated Meter and actual SF information give data channel symbols maximum-ratio combing unit, while the channel estimation of each HSUPA user, actual SF, scrambling code number, spreading code number these information are issued into interference reconstruction unit as channel parameter；
4th step：Data channel symbols maximum-ratio combing unit, the channel estimation value and actual SF sent according to control channel Symbol processing unit, the data channel symbols progress channel compensation and maximum-ratio combing that RAKE demodulating units are demodulated to each HSUPA user sent after completing add up, and obtain the data symbol of final data channel and are sent in interference reconstruction unit；
5th step：Interference reconstruction unit carries out judging whether to need to carry out interference reconstruct to these data symbols of reception first, selects SF<The data symbol of the data channel of=4 user is multiplied by the channel estimation value parameter of user, then carried out scrambling expansion according to the actual SF, the scrambling code number of user and spreading code number of user, the cumulative of multi-user is carried out, then interference cancellation unit is given with the data flow that interpolation filter is obtained as antenna data sample rate by pulse shaping filter；If SF>When 4, the data symbol of the HSUPA user can directly be exported to progress symbol level processing.
6th step：The antenna data of input is first entered line delay by interference cancellation unit, the interference signal exported with interference reconstruction unit is alignd, then the interference data for subtracting input with the antenna data of input obtain the antenna data after interference is eliminated, and the RAKE demodulation for being then sent through antenna data delays time to control unit for other users is used.
High speed uplink data service, when spreading factor SF=2 or 4, during especially SF=2, because channelization code tree reason causes intersymbol interference very big between other subscriber channels, intersymbol interference is very too, but, using device and method of the present invention, to the user SF of high speed uplink data service<=4 data carry out interference reconstruct and interference is eliminated, and the RAKE for other users after re-entering is demodulated, and can effectively reduce the intersymbol interference between other non-high-speed upstream data service users.
In summary, reconstructed by increasing Interference Cancellation and interference, high speed uplink data service is set to be cancelled as the interference of other users, the RAKE for being so used for other users with the antenna data after Interference Cancellation is demodulated, so as to improve traditional RAKE receiver in the presence of high speed uplink data service, the shortcoming that other users can not access or access performance is bad.Present invention improves base station uplink receiving performance, it is ensured that system still can support the ability compared with multi-user under high speed uplink data service requirement. Industrial applicibility
Multi-user interference cancellation RAKE receiver device disclosed by the invention, when can access the user of high speed uplink data service in a wcdma system, effectively offsets the influence to other users, it is to avoid or mitigate due to disturbing caused power ramp and number of users to decline.

Claims (9)

  1. Claims
    1st, the multi-user interference cancellation RAKE receiver device of a kind of broadband CDMA system, including RAKE demodulating units, the RAKE demodulating units are connected with antenna data delays time to control unit, control channel Symbol processing unit, data channel symbols maximum-ratio combing unit respectively, simultaneously, control channel Symbol processing unit is also connected with data channel symbols maximum-ratio combing unit, characterized in that, the device also includes interference reconstruction unit and interference cancellation unit, wherein：
    Interference reconstruction unit, respectively with data channel symbols maximum-ratio combing unit, control channel Symbol processing unit is connected, the data channel signal symbol of high speed uplink data service customers is received from data channel symbols maximum-ratio combing unit, the spreading factor carried according to the data symbol judges whether the user needs to carry out interference reconstruct, when spreading factor is less than or equal to first threshold, according to the user's scrambler and channelization code information received from control channel Symbol processing unit, interference reconstruct is carried out to the data channel signal symbol of the user, interference data output as antenna data sample rate is obtained to interference cancellation unit, otherwise the data channel signal symbol for directly exporting the user carries out symbol Grade processing；
    Interference cancellation unit, the initial antenna data from antenna are received from antenna data delays time to control unit, with being subtracted each other after the interference alignment of data that is exported from interference reconstruction unit, obtain the antenna data for removing interference, antenna data delays time to control unit is sent to, the RAKE for other users is demodulated.
    2nd, multi-user interference cancellation RAKE receiver device as claimed in claim 1, it is characterised in that：
    The antenna data delays time to control unit, antenna data after the process multi-user interference received for the initial antenna data to being received from antenna and from the interference cancellation unit is eliminated carries out delays time to control together, initial antenna is sent into RAKE demodulating units is used for the data demodulation of high speed uplink data service customers, and the antenna data after eliminating will be disturbed to be sent to RAKE demodulating units and demodulated for the data of other non-high-speed upstream data service users；
    The RAKE demodulating units, the antenna data that antenna data delays time to control unit is sent carries out multi-path demodulation, the data symbol of different user is obtained, control channel Symbol processing unit and data channel symbols maximum-ratio combing unit is given according to the control channel data symbol and data channel signal symbol of user respectively；
    The control channel Symbol processing unit, for each use to being received from RAKE demodulating units The control channel data symbol at family 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 sent to data channel symbols maximum-ratio combing unit, interference reconstruction unit is given by the scrambler and channelization code information of each high speed uplink data service customers；
    The data channel symbols maximum-ratio combing unit, the channel estimation value and actual spreading factor sent according to control channel Symbol processing unit, the data channel signal symbol progress channel compensation and maximum-ratio combing that RAKE demodulating units are demodulated to each user sent after completing add up, the data symbol of final data channel is obtained, the data channel signal symbol of each high speed uplink data service customers is sent to interference reconstruction unit.
    3rd, multi-user interference cancellation RAKE receiver device as claimed in claim 1, it is characterised in that the interference reconstruction unit, including：Comparator, accumulator, pulse shaping filter, interpolation filter, and first multiplier corresponding with each ^ " of user one, the second multiplier, scrambler and channel code generation module between comparator and accumulator, wherein：
    Comparator, for the data symbol for the data channel for receiving each user of high speed uplink data service, judge whether the user needs to carry out interference reconstruct according to the actual spreading factor of each user, when the rustic frequency factor is less than or equal to first threshold, send into corresponding first multiplier of the user, otherwise, ' directly export the user data channel data symbol carry out symbol Grade processing；
    First multiplier, carries out multiplying to the data symbol of data channel and the channel estimation parameter of the user received from comparator, obtains the data symbol with channel information and send into the second multiplier；Scrambler and channel code generation module, according to the actual spreading factor, scrambler and channel code parameter of the user received from control channel Symbol processing unit, the scrambler and channel code for producing the user send into the second multiplier；
    Second multiplier, according to the scrambler and channel code from scrambler and the user of channel code generation module reception, to from the first multiplier receive described in carry channel information data symbol, the multiplying of scrambling is carried out plus expanded, the chip data with channel information of the user are exported to the accumulator；
    The chip data with channel information received from corresponding second multiplier of each user of high speed uplink data service are added up by accumulator, obtain the chip data output with channel information of reconstruct of all users to the pulse shaping filter； Pulse shaping filter, to the chip data with channel information of the reconstruct of all high speed uplink data service customers of reception, carries out pulse shaping processing, delivers to interpolation filter；
    Interpolation filter, the chip data with channel information to the reconstruct of all users after pulse shaping processing carry out interpolation processing, obtain the interference data of sampling rate identical with the initial antenna data that user is actual, output to interference cancellation unit.
    4th, multi-user interference cancellation RAKE receiver device as claimed in claim 1, it is characterized in that, the interference reconstruction unit, the data symbol of the data channel of high speed uplink data service customers is received from data channel symbols maximum-ratio combing unit, when judging whether the user needs to carry out interference reconstruct according to spreading factor therein, if spreading factor is more than first threshold, the data symbol of data channel of user is directly exported for symbol level processing.
    5th, the multi-user interference cancellation RAKE receiver device as described in claim 1 or 3 or 4, it is characterised in that the first threshold of the spreading factor is equal to4。
    6th, multi-user interference cancellation RAKE receiver device as claimed in claim 1, it is characterised in that the interference cancellation unit, including delayer and subtracter, wherein：
    Delayer, for entering line delay to the initial antenna data inputted from antenna end, by the initial antenna data and the interference alignment of data from interference reconstruction unit reception；
    Subtracter, for the initial antenna data through delay alignment to inputting jointly subtraction is carried out with the interference data that interference reconstruction unit is exported, the antenna data through removing the interference of high speed uplink data service signal is exported, being sent to antenna data delays time to control unit is used for the data demodulation of other non-high-speed upstream data service users.
    7th, a kind of method of work based on multi-user interference cancellation RAKE receiver device described in claim 1, it is characterised in that comprise the following steps：
    (1) to the initial antenna data from antenna, after antenna data delays time to control unit delays time to control, send into RAKE demodulating units, control channel Symbol processing unit, data channel symbols maximum-ratio combing cell processing, channel estimation value, actual spreading factor, the scrambler of each user and the channelization code information of every multipath are obtained in control channel Symbol processing unit, the data symbol of the data channel of high speed uplink data service customers is obtained in data channel symbols maximum-ratio combing unit, interference reconstruction unit is sent into；
    (2) spreading factor of input is less than or equal in the high speed of first threshold by interference reconstruction unit The data symbol of row data service customers data channel carries out interference reconstruct, obtains the interference data as initial antenna data sampling rate and is sent to interference cancellation unit；
    (3) the initial antenna data by delays time to control are received by interference cancellation unit, with being subtracted each other after the interference alignment of data that is exported from interference reconstruction unit, the antenna data that interference is removed in acquisition is sent to antenna data delays time to control unit, and the RAKE demodulation for other users after delays time to control is used.
    8th, method of work as claimed in claim 7, it is characterised in that step（1) further comprise：
    (1-1) is controlled the initial antenna data delay received from antenna by antenna data delays time to control unit, is sent to RAKE demodulating units；
    The initial antenna data that (1-2) are sent by RAKE demodulating units to antenna data delays time to control unit carry out multi-path demodulation, the data symbol of different user is obtained, control channel Symbol processing unit and data channel symbols maximum-ratio combing unit is given according to the control channel data symbol and data channel signal symbol of user respectively；
    The control channel data symbol of each user of (1-3) by control channel Symbol processing unit to being received from RAKE demodulating units 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 sent to data channel symbols maximum-ratio combing unit, interference reconstruction unit is given by the scrambler and channelization code information of each high speed uplink data service customers；
    Channel estimation value and actual spreading factor that (1-4) are sent by data channel symbols maximum-ratio combing unit according to control channel Symbol processing unit, the data channel signal symbol progress channel compensation and maximum-ratio combing that RAKE demodulating units are demodulated to each user sent afterwards add up, and the data symbol for obtaining the data channel of high speed uplink data service customers is sent to interference reconstruction unit.
    9th, method of work as claimed in claim 7, it is characterised in that step（2) further comprise：
    The data symbol of the data channel of each user is received using comparator, actual spreading factor therein and first threshold are compared, when spreading factor is more than first threshold, directly export the data symbol of the data channel of the user, otherwise, using corresponding first multiplier of the user, multiplying is carried out to the data symbol of data channel and the channel estimation parameter of the user of reception, obtained with channel information Data symbol, wherein the value of the first threshold is 4;
    According to the actual spreading factor, scrambler and channel code parameter of the user received from control channel Symbol processing unit, the scrambler and herdsman's roadization code of the user is produced by scrambler and channel code generation module；
    According to the scrambler and channel code from scrambler and the user of channel code generation module reception, as the second multiplier to from the first multiplier receive described in carry channel information data symbol, the multiplying of scrambling is carried out plus expanded, the chip data with channel information of the user are exported to accumulator；
    The chip data with channel information received from corresponding second multiplier of each user are added up using accumulator, the chip data output with channel information of reconstruct of all users are obtained to pulse shaping filter；
    Using chip data with channel information of the pulse shaping filter to the reconstruct of all users of reception, pulse shaping processing is carried out, interpolation filter is delivered to；
    Interpolation processing is carried out to the chip data with channel information of the reconstruct of all users after pulse shaping processing using interpolation filter, the interference data of sampling rate identical with the antenna data that user is actual, output to interference cancellation unit are obtained.
    10th, method of work as claimed in claim 7, it is characterised in that the step（3) it can further be divided into：
    Line delay is entered to the initial antenna data inputted from antenna end using delayer, by the antenna data of the input and the interference alignment of data from interference reconstruction unit reception；
    Data, which are disturbed, using the antenna thousand for subtracting the antenna data after device aligns to the delay inputted jointly and interference reconstruction unit output carries out subtraction, export the antenna data through removing the interference of high speed uplink data service signal, antenna data delays time to control unit is sent to, the RAKE for other non-high-speed upstream data service users after delays time to control is demodulated.
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