CN1364004A - Method and device for eliminating spectrum-spreading interference in WCDMA system - Google Patents
Method and device for eliminating spectrum-spreading interference in WCDMA system Download PDFInfo
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- CN1364004A CN1364004A CN00137219A CN00137219A CN1364004A CN 1364004 A CN1364004 A CN 1364004A CN 00137219 A CN00137219 A CN 00137219A CN 00137219 A CN00137219 A CN 00137219A CN 1364004 A CN1364004 A CN 1364004A
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Abstract
The invention discloses a method and device for eliminating interfere of spread spectrum in WCDMA. The characteristics of the method are as follows: evaluation of channel is carried out by using non-continuous signs of pilot frequency inserted in data channel and eliminating interfere is carried out by using factor of spread spectrum as grouping coefficient. The method combines cancellation of serial interferes and cancellation of parallel interferes. The device for eliminating interfere of spread spectrum provides features of simple, good effect in condition of multi transactions. It can also eliminate influence of transaction transfer in high speed on transaction in lower speed so as to reduce complexity of calulation.
Description
The present invention relates to communication system, be specifically related to the multiple access interference cancellation apparatus and method in Wideband Code Division Multiple Access (WCDMA) (WCDMA) communication control processor.
In the DS-CDMA mobile communcations system, it is the greatest factor of restriction system capacity and performance that multipath disturbs (MPI, Multipath Interference) and multiple access to disturb (MAI, Multiple Access Interference).Realize because the cdma system channel multiplexing is the orthogonality by spreading code, yet spread spectrum code sequence is difficult to realize complete quadrature in the system, even may not reach quadrature sometimes.So more for a long time, different user code word is to each other disturbed and will be compared seriously in number of users, that is exists serious multiple access interference, thereby greatly reduce communication quality, the lifting of restriction system user capacity.In the existing conventional cdma receiver, adopt the RAKE diversity reception to suppress the influence that multipath disturbs usually, but the influence that multiple access disturbs in the often less consideration wireless channel, so power system capacity is difficult to have a distinct increment.For improving power system capacity, adopt the method for power control usually, disturb to reduce different user code word to each other (being that multiple access disturbs); But the method for power control implements more complicated on the one hand, can not really eliminate multiple access on the other hand and disturb from received signal, can only partly reduce multiple access and disturb, and is difficult to fundamentally solve the multiple access interference problem.In order when effectively eliminating the multiple access interference, to increase substantially power system capacity again, preferably adopt Multiuser Detection (MUD) technology.
Best multi-user detector is proposed in 1986 by S.Verdu.At present, Multiuser Detection mainly is divided into two big classes, and linear multi-user detects and non-linear Multiuser Detection.Linear multi-user detects and to comprise that mainly least mean-square error (MMSE) detects, the linear solution Multiuser Detection of be correlated with, multinomial expansion detection etc.Non-linear Multiuser Detection mainly comprises parallel interference elimination, serial interference elimination, several different methods such as decision-feedback interference eliminated.In the WCDMA system, base station carrying number of users is more, and the operand that causes linear multi-user to detect is excessive, is difficult to use in real system.But not the linear multi-user detection technique, advantage such as promptly interference eliminated is then simple relatively with its computing, and computational complexity is low receives the concern of each side.Traditional interference eliminated multiuser receiver still exists a lot of problems: not only need the transporting speech business in the mobile communcations system of next band, also will transmit various Packet data services, multimedia service etc.To the processing of different service types, the reception of signal and the recovery of primary signal accurately wait the poor-performing exclusive disjunction that causes traditional interference eliminated multiuser receiver too complicated inadequately, can't realize in real system.
The objective of the invention is to overcome the deficiencies in the prior art, propose the method and apparatus of a kind of Wideband Code Division Multiple Access (WCDMA) (WCDMA) system spread-spectrum interference eliminated, can take into account the structure and the operand of system, reduce the processing time delay simultaneously.
For realizing purpose of the present invention, the device of the spread spectrum interference eliminated that the present invention proposes comprises:
The spread spectrum packeting controller is used for connecing people's preface information, and according to the spreading factor that preface information is obtained to disturbing the burster processing that is configured and sorts;
(n-1) individual time delay module, when carrying out the primary signal of described spread spectrum packeting controller, first time delay module delays, deliver to second and disturb burster, second time delay module delivered to the 3rd with delay time signal and disturbed burster, by that analogy, (n-1) time delay module is delivered to (n) individual interference burster with delay time signal;
N is disturbed burster, and first signal that disturbs burster to receive described spread spectrum packeting controller carries out parallel interference and eliminates processing, the signal part output after the processing, and another part is delivered to the 2nd and is disturbed burster; Since the 2nd interference burster,, time delay module that receives and the signal that disturbs burster are carried out parallel interference elimination processing, and the signal of exporting after handling is delivered to this signal next interference burster simultaneously until (n) individual interference burster.
In above-mentioned spread spectrum interference blanking unit, described interference burster comprises:
The additive operation device is used for the output signal of original input signal and last one group of interference burster is carried out additive operation, and operation result is delivered to the first order disturb grouped element;
The interference grouped element of m level series connection, each grade disturb grouped element to comprise a time delay unit, k interference eliminator and an arithmetic unit group; The first order disturbs grouped element to receive signal from the additive operation device, and the signal after will handling gives next stage interference grouped element, and the signal after the interference grouped element of m level will be handled is given receiver;
K receiver is used to receive the signal that the m level disturbs grouped element to handle, and the signal after handling is delivered to decoder;
In above-mentioned interference grouped element, described time delay unit is used to receive the primary signal that upper level transmits, and through time delay processing, the signal strictness after making primary signal and recovering reaches synchronously, gives arithmetic unit group at the corresponding levels;
A described k interference eliminator is parallel to be connected, and is used to receive the signal that disturbs the outside input of grouped element, carries out interference elimination treatment, then the signal after handling is delivered to arithmetic unit group at the corresponding levels;
Described arithmetic unit group is used for the signal of interference eliminator output is carried out calculation process, and operation result is exported.
In the spread spectrum countermeasure set of the present invention, described interference eliminated implement body comprises:
The receiver module identical with receiver architecture: be used to receive the signal of upper level arithmetic unit group output, carry out descrambling and de-spreading, the high specific merging obtains original data signal, gives the hard decision module;
The hard decision module: the signal that receives from receiver module carries out delivering to the recovery module after the hard decision process;
Recover module: receive the signal of hard decision module output, it is the data of similar primary signal that the phase information of using multidiameter delay and channel estimating to obtain adds the expansion scrambling again with signal, and gives arithmetic unit group at the corresponding levels with these data.
The method that is used for described spread spectrum interference blanking unit that the present invention proposes may further comprise the steps:
1, the spread spectrum packeting controller obtains the dedicated channel of access subsequently according to the targeting signal of demodulation access channel
Various channel informations;
2, the spread spectrum packeting controller disturbs burster to advance according to the spreading factor in the channel information that obtains to each
Row configuration and ordering are handled;
3, each disturbs burster according to control signal configuration PN code generator, and it is required to produce the demodulation different user
Spreading code and scrambler;
4, disturbing burster inside to carry out part multistage parallel interference elimination treatment; Simultaneously
5, carrying out serial interference elimination between the interference burster handles.
Described spread spectrum interference elimination method, step 2 specifically comprises:
(1), according to the size of spreading factor, described spread spectrum packeting controller carries out pre-configured to described interference burster;
(2), in access procedure, described spread spectrum packeting controller carries out correspondence configuration with pre-configured to different business, disposes described interference burster by the big minor mistake in treatment of desired volume of business;
(3), need carry out different business, former configuration remains unchanged if any the user.
Described spread spectrum interference elimination method, step 4 specifically comprises:
After in disturbing burster, will receiving accumulative total interference signal sn (t) that primary signal r (t) and higher level through the time delay module disturb burster to export and subtracting each other, input first order interference eliminator carries out interference elimination treatment, result is delivered to the next stage interference eliminator again, finishing inner parallel interference until the m level eliminates, signal after eliminating is delivered to described receiver carry out the signal demodulation, the signal after the demodulation is given next stage and is disturbed burster.
Described spread spectrum interference elimination method, step 5 specifically comprises:
Interference burster receiving units at different levels receive through the primary signal after the described time delay module time delay processing simultaneously through the signal of upper level interference burster interference eliminated and demodulation, and the corresponding levels are parallel to be eliminated to carrying out behind these two kinds of signal operations; By that analogy, finish until disturbing burster (n) to eliminate processing.
Below in conjunction with drawings and Examples the present invention is elaborated.
Fig. 1 is the overall structure figure of the spread spectrum interference blanking unit that proposes of the present invention.
Fig. 2 is the structure chart that disturbs burster 2000 among Fig. 1.
Fig. 3 is the structure chart of interference eliminator among Fig. 2.
Fig. 4 is the spread spectrum interference elimination method flow chart that the present invention proposes.
As shown in Figure 1, described spread spectrum interference blanking unit comprises that spread spectrum packeting controller 1000, n disturb burster 2000 and (n-1) individual time delay module 3000, burster is disturbed in n of " 2000-n " expression among the figure, " 3000-(n-1) " represents (n-1) individual time delay module, owing to disturb not receive time delay signal of burster (1), so first time delay module (3000-1) is connected with disturbing burster (2).From disturbing burster (2), described interference burster not only needs to receive the primary signal r (t) through time delay module time delay processing, also will receive the accumulative total interference signal sn (t) that the higher level disturbs burster output.In the WCDMA system, system supports multiple transmission rate such as 2M, 384K, 144K, 64K, 12.2K or the like.Along with the raising of data transfer rate, transmitting power obviously rises.In base station side, though the signaling data link of High Data Rate is less, the interference that other link is caused is the most serious.Therefore when described spread spectrum packeting controller is for the ordering of described interference burster based on this parameter of spreading factor, one group of user of spreading factor minimum is because transmitting power is higher than other users, the noise jamming influence of low-rate channel can be ignored, therefore disturb burster (1) for its preassignment, distribute successively with this principle, disturb burster (n) until the user of spreading factor maximum is assigned to.Each disturbs burster will organize the interior signal that walks abreast after eliminating and passes to next stage interference burster, simultaneously also with this signal output.
As shown in Figure 2, each disturbs has the m level to disturb grouped element in burster, and each grade comprises k parallel interference eliminator 2100, a time delay unit 2300 and an arithmetic unit group 2200.The accumulated signal sn (t) that primary signal r (t) after time delay module 3000 outside the process interference burster is handled and upper level interference burster interference eliminated are exported is sent to the first order, the second level behind process additive operation device 2400 ... the m level disturbs grouped element to organize the interior elimination that walks abreast successively.From experimental result, two-stage is eliminated and can be achieved the goal substantially.The signal that obtains is at last delivered to receiver 2500 and is carried out descrambling/despreading, and high specific merges to obtain original data signal.
As shown in Figure 3, expression be the internal structure of each interference eliminator, comprise receiver module 2110, hard decision module 2130 and recover module 2120.Disturb receiver 2500 structures in the burster identical among described receiver module and Fig. 2.
As shown in Figure 4, be the flow chart of the spread spectrum interference elimination method that proposes of the present invention.
The present invention is the combination of successive interference cancellation and parallel interference cancellation.
In the spread spectrum packeting controller, system at first receives access lead information, to insert each user's spread spectrum coefficient, spreading code number, scrambler number etc.The spreading factor that the spread spectrum packeting controller obtains according to preface information disturb burster to be configured to each, and ordering is handled.In sequencer procedure, following judgement is arranged:
According to the size of spreading factor, it is pre-configured that 1000 pairs of spread spectrum packeting controllers disturb burster 2000 to carry out, and the user of spreading factor minimum sends into and disturbs burster (1), and burster (2) is disturbed in arriving of taking second place, until disturb burster (n);
In access procedure, spread spectrum packeting controller 1000 carries out the correspondence configuration with pre-configured to different business, the big minor mistake in treatment of transmission rate by business disposes described interference burster, and promptly business such as the voice service to the desired rate minimum is dispensed to interference burster (n) with it;
Need carry out different business if any the user, the interference burster of former configuration remains unchanged to finishing to connecting, and does not need the transmission rate reallocation according to business.
For the spreading factor minimum, the user of received power maximum only within it portion's parallel elimination mutually of disturbing handle.After demodulation, obtain again signal being recovered after the information, obtain single user's original restoring signal, addition obtains current group original restoring signal.Give next stage and disturb burster.
The interference burster of next stage not only needs to receive the primary signal r (t) through the time delay module, also will receive the accumulative total interference signal sn (t) that the higher level disturbs burster output.Carry out this parallel interference after in disturbing burster, subtracting each other again and eliminate processing.By that analogy, finish until the interference elimination treatment of the maximum group of spreading factor.
In single interference eliminator, carry out branch despreading/descrambling 2112 directly according to the multipath information of Multipath searching 2111 acquisitions and 2113 pairs of baseband receiving signals of corresponding PN sign indicating number of system's generation.The Multipath searching module of native system produces the phase delay information in five main footpaths, recover but only use isolated most powerful path and time strong footpath to separate the mediation channel estimating in the first order and second level interference eliminator, 2110 of receiver modules adopt the main footpath of three of Multipath searching to handle.The purpose of doing so also is in order to reduce the complexity of computing as much as possible.Following processing is carried out in every single footpath of signal respectively:
Spreading rate behind the spread spectrum is demodulated into the information of character rate, passes through demultiplexing then, pilot frequency sequence is extracted from channel data, send into channel estimation module 2114 and carry out channel estimation process.Channel estimating adopts maintenance or interpolation filtering 2116 all can.Use the amplitude of channel estimation module 2114 outputs and the information of phase place that data-signal is compensated 2115.Again each signal directly that acquires is carried out high specific and merge 2117.Thereby finish the signal demodulation work of unique user.
Data after 2130 pairs of high specifics of hard decision module merge are carried out hard decision.
The course of work of recovering module 2120 is:
Data behind the hard decision are at first added expansion/scrambling 2121 acquisition spectrum-spreading and scrambling data according to the PN sign indicating number that PN code generator 2114 generates to signal.The phase-amplitude information that re-uses channel estimating output is carried out channel recovery 2122, with the influence of avoiding wireless transmission channel that signal is caused.Carry out up-sampling filtering 2123 again, produce and pass through the signal of the initial data same data rate of A/D conversion, add the multipath information 2111 of multipath tracking module again, and carry out the summation of multipath information, generate single user's original restoring signal.So just finished the work that recovers module 2120.
The method and apparatus of spread spectrum interference eliminated in a kind of WCDMA system that the present invention proposes, described method is to utilize the non-continuous pilot frequency symbol that inserts data channel to carry out channel estimating, and use spreading factor to carry out interference eliminated as the grouping coefficient, be the combination of successive interference cancellation and parallel interference cancellation.The apparatus structure of the spread spectrum interference eliminated that the present invention proposes is simple, and is very obvious for the interference eliminated effect under the multi-service condition, can effectively eliminate under the high speed business transmission situation influence to the low speed business, and reduce computational complexity greatly.For unique user, need not to disturb recovery to eliminate processing to other all users.
Claims (9)
1, a kind of device of WCDMA system spread-spectrum interference eliminated is characterized in that comprising:
Spread spectrum packeting controller (1000) is used for connecing people's preface information, and according to the spreading factor that preface information is obtained to disturbing burster (2000) processing that is configured and sorts;
(n-1) individual time delay module (3000), when carrying out the primary signal of described spread spectrum packeting controller (1000), first time delay module (3000-1) delays, deliver to second and disturb burster (2000-2), second time delay module (3000-2) delivered to the 3rd with delay time signal and disturbed burster (2000-3), by that analogy, (n-1) time delay module (3000-(n-1)) is delivered to (n) individual interference burster (2000-n) with delay time signal;
N is disturbed burster (2000), first signal that disturbs burster (2000-1) to receive described spread spectrum packeting controller (1000) carries out parallel interference and eliminates processing, signal part output after the processing, another part is delivered to second and is disturbed burster (2000-2); Disturb burster (2000-2) since second, until (n) individual interference burster (2000-n), time delay module (3000) that receives and the signal that disturbs burster (2000) are carried out parallel interference elimination processing, and the signal after the output processing is delivered to this signal next interference burster simultaneously.
2, spread spectrum interference blanking unit as claimed in claim 1 is characterized in that described interference burster (2000) comprising:
Additive operation device (2400) is used for the output signal of original input signal and last one group of interference burster is carried out additive operation, and operation result is delivered to the first order disturb grouped element;
The interference grouped element of m level series connection, the first order is disturbed the signal of grouped element reception from the additive operation device, and the signal after will handling is given next stage interference grouped element, begin level to (m-1) from the second level, upper level disturbs the signal after grouped element will be handled to send into next stage, and the signal after the interference grouped element of m level will be handled is given receiver;
K receiver (2500) is used for the signal that parallel receive m level disturbs grouped element to handle, with the signal output after handling.
3, spread spectrum interference blanking unit as claimed in claim 2 is characterized in that described interference grouped element comprises:
Time delay unit (2300) is used to receive the primary signal that upper level transmits, and through time delay processing, the signal strictness after making primary signal and recovering reaches synchronously, gives arithmetic unit group at the corresponding levels;
K parallel connection of interference eliminator is used to receive the signal that disturbs the outside input of grouped element, carries out interference elimination treatment, then the signal after handling delivered to arithmetic unit group at the corresponding levels;
Arithmetic unit group (2200) is used for the signal of interference eliminator output is carried out calculation process, and operation result is exported.
4, spread spectrum interference blanking unit as claimed in claim 3 is characterized in that described interference eliminator comprises:
The receiver module (2110) identical with receiver (2500) structure is used to receive the signal that upper level arithmetic unit group is exported, and carries out descrambling and de-spreading, and the high specific merging obtains original data signal, gives the hard decision module;
Hard decision module (2130) is used for the signal from receiver module is carried out delivering to recovery module (2120) after the hard decision process;
Recover module (2120), receive the signal of hard decision module output, it is the data of similar primary signal that the phase information of using multidiameter delay and channel estimating to obtain adds the expansion scrambling again with signal, and gives arithmetic unit group at the corresponding levels with these data.
5, a kind of method that is applied in the described spread spectrum interference blanking unit of claim 1 is characterized in that comprising: (1) described spread spectrum packeting controller (1000) obtains to insert subsequently according to the targeting signal of demodulation access channel
The various channel informations of dedicated channel; (2) described spread spectrum packeting controller (1000) is done described according to the spreading factor in the channel information that obtains
Disturb burster (2000) processing that is configured and sorts; (3) described interference burster (2000) produces according to control signal configuration PN code generator (2113)
Spreading code that the demodulation different user is required and scrambler; (4) carry out part multistage parallel interference elimination treatment in described interference burster (2000) inside; (5) carry out the serial interference elimination processing between described interference burster (2000) simultaneously.
6, method as claimed in claim 5 is characterized in that described step (2) is configured described interference burster (2000) and the processing of sorting comprises:
At first, according to the size of spreading factor, described spread spectrum packeting controller (1000) carries out pre-configured to described interference burster (2000);
In access procedure, described spread spectrum packeting controller (1000) is configured pre-configured difference according to business to the user, disposes described interference burster (2000) by the big minor mistake in treatment of transmission rate of business;
Need carry out the different business of transmission rate if any the user, the interference burster of former configuration remains unchanged.
7, method as claimed in claim 5, interference burster (2000) inside that it is characterized in that described step (4) is carried out part multistage parallel interference elimination treatment and is comprised:
After in disturbing burster, will receiving accumulative total interference signal sn (t) that primary signal r (t) and higher level through the time delay module disturb burster to export and subtracting each other, input first order interference eliminator carries out interference elimination treatment, result is delivered to the next stage interference eliminator again, finishing inner parallel interference until the m level eliminates, signal after eliminating is delivered to described receiver (2110) carry out the signal demodulation, the signal after the demodulation is given next stage and is disturbed burster.
8, method as claimed in claim 5 is characterized in that carrying out between the described interference burster (2000) of described step (5) serial interference elimination and handles and comprise:
The signal that disturbs the burster receiving unit through upper level interference burster interference eliminated and demodulation at the corresponding levels receives simultaneously through the primary signal after described time delay module (3000) time delay processing, and the corresponding levels are parallel to be eliminated to carrying out behind these two kinds of signal operations; By that analogy, finish until disturbing burster (n) to eliminate processing.
9, method as claimed in claim 7 is characterized in that the interference elimination treatment of described interference eliminator comprises:
Spreading rate behind the spread spectrum is demodulated into the information of character rate, passes through demultiplexing then, pilot frequency sequence is extracted from channel data, send into channel estimation module (2114) and carry out channel estimation process; Channel estimating adopts maintenance or interpolation filtering (2116) all can;
Use the amplitude of channel estimation module (2114) output and the information of phase place that data-signal is compensated (2115), again each signal directly that acquires is carried out high specific and merge (2117), the data after hard decision module (2130) merges high specific are carried out hard decision;
Data behind the hard decision are at first added expansion scrambling (2121) acquisition spectrum-spreading and scrambling data according to the PN sign indicating number that PN code generator (2114) generates to signal;
The phase-amplitude information that re-uses channel estimating output is carried out channel recovery (2122), carry out up-sampling filtering (2123) again, produce signal with the initial data same data rate of passing through the A/D conversion, the multipath information (2111) that adds the multipath tracking module again, and carry out the addition of multipath information, generate single user's original restoring signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00137219A CN1133291C (en) | 2000-12-30 | 2000-12-30 | Method and device for eliminating spectrum-spreading interference in WCDMA system |
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| CN00137219A CN1133291C (en) | 2000-12-30 | 2000-12-30 | Method and device for eliminating spectrum-spreading interference in WCDMA system |
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| CN1364004A true CN1364004A (en) | 2002-08-14 |
| CN1133291C CN1133291C (en) | 2003-12-31 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004052038A1 (en) * | 2002-12-05 | 2004-06-17 | Huawei Technologies Co., Ltd | A multiuser receiving means of uplink dedicated physical channel in wcdma system |
| CN103490828A (en) * | 2013-09-11 | 2014-01-01 | 华为技术有限公司 | Gain sharing device of interference cancellation system, method and interference cancellation system |
| WO2014015836A1 (en) * | 2012-07-26 | 2014-01-30 | 中兴通讯股份有限公司 | Method and apparatus for eliminating interference between baseband boards |
-
2000
- 2000-12-30 CN CN00137219A patent/CN1133291C/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004052038A1 (en) * | 2002-12-05 | 2004-06-17 | Huawei Technologies Co., Ltd | A multiuser receiving means of uplink dedicated physical channel in wcdma system |
| CN100382469C (en) * | 2002-12-05 | 2008-04-16 | 华为技术有限公司 | A multi-user receiving device of uplink dedicated physical channel in WCDMA system |
| WO2014015836A1 (en) * | 2012-07-26 | 2014-01-30 | 中兴通讯股份有限公司 | Method and apparatus for eliminating interference between baseband boards |
| CN103581076A (en) * | 2012-07-26 | 2014-02-12 | 中兴通讯股份有限公司 | Method and device for eliminating interference between base band boards |
| 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 |
| CN103490828A (en) * | 2013-09-11 | 2014-01-01 | 华为技术有限公司 | Gain sharing device of interference cancellation system, method and interference cancellation system |
| CN103490828B (en) * | 2013-09-11 | 2015-06-17 | 华为技术有限公司 | Gain sharing device of interference cancellation system, method and interference cancellation system |
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| CN1133291C (en) | 2003-12-31 |
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