CN105099500B - The detection method and device of inter-frequency interference cell spreading factor - Google Patents
The detection method and device of inter-frequency interference cell spreading factor Download PDFInfo
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Abstract
The device and method of TD-SCDMA cordless communication network are provided.Equipment includes: input unit, receives the signal in current time slots；Channel estimating unit carries out the channel estimation of inter-frequency interference cell to received signal to restore the interference signal of the inter-frequency interference cell；Matched filtering unit carries out matched filtering to the interference signal of recovery；Descrambling unit descrambles the interference signal after matched filtering；First power calculation unit, the power of the interference signal after calculating descrambling；Detection processing unit, to after descrambling interference signal carry out detection processing so that when the interference signal after the descrambling is broadband signal its power reduce and when it is low frequency and narrow bandwidth signal its power it is constant or reduce it is less；Second power calculation unit, the power of the interference signal after calculating detection processing；The power of interference signal after descrambling is compared with the ratio of the power of the interference signal after detection processing with predetermined threshold so that it is determined that spreading factor by spreading factor determination unit.
Description
Technical field
The present invention relates to the spreading factors of inter-frequency interference cell in mobile communication field more particularly to TD-SCDMA system
Detection method and device.
Background technique
Device described in this section can be implemented, but be not necessarily the method conceived or carried out in advance.Therefore, it removes
Non- otherwise indicated herein, otherwise device described in this section is not existing skill for the claim in the application
Art and the prior art is not recognized as and being included in this section.In addition, all embodiments of the disclosure need not solve
Whole (or even any one) in the problem of being proposed in this part.
With the rise of the development of wireless communication technique and 3G (Third Generation) Moblie (3G) in the world, radio resource
As a kind of limited resource, the increasingly anxiety of change.For the TD-SCDMA system that the mainstream standard of 3G is queried, quilt
The radio resource of distribution is also very limited.In order to improve the availability of frequency spectrum of TD-SCDMA system, identical networking becomes one
Kind effective solution scheme.
In the TD-SCDMA system of identical networking, co-channel interference is dramatically increased.The effective ways of removal co-channel interference are connection
The interference cancellation algorithm in detection is closed, the input that interference cancellation algorithm needs is: serving cell and inter-frequency interference cell information.Such as
The spreading factor of the actual inter-frequency interference cell of fruit and the spreading factor inputted as interference cancellation algorithm are inconsistent, will lead to and connect
The performance of receipts machine declines.In order to improve the performance of receiver, the relevant information for accurately obtaining inter-frequency interference cell is extremely important.
Currently, due to lacking the detection method to the spreading factor of inter-frequency interference cell, the spread spectrum of inter-frequency interference cell because
Son is all defaulted as 16.But in practical situations, there are two types of possible for spreading factor in down channel: 1 or 16.If spread spectrum because
(such as the spreading factor of usual down channel is 1 in HSDPA technology) but will be to receiver using the 16 of default when son is 1
Performance cause to decline, influence the performance of joint-detection.
It is adopted in TD-SCDMA (Time Division Synchronous CDMA, Time Division-Synchronous Code Division Multiple Access) system
Associated detection technique is to make full use of on the basis of traditional sensing techniques and cause MAI(Multiple Address
Interfere, multi-access inference) all subscriber signals and its multipath prior information, the separation of subscriber signal as one
Unified is mutually related joint detection process to complete, to have excellent interference free performance, reduces system to power
The requirement of precision is controlled, therefore can more efficiently utilize uplink spectrum resource, improves power system capacity significantly.
The purpose of joint-detection is exactly to go out user's transmission according to the spreading code and channel impulse response estimation of all users
Original signal.Therefore the premise of joint detection algorithm is to obtain the spreading code and channel impulse response of all users.TD-
It is provided in the frame structure in SCDMA system and is used to carry out the training sequence Midamb1e(intermediate code of channel estimation), according to connecing
The training sequence signal received and our known training sequences can estimate channel impulse response, and determine spreading code,
So as to estimate user's original signal.
It in the intermediate code that same cell uses is generated after cyclic shift by the same basic midamble code.Entire system
It is the basic midamble code of 144chips that system, which has 128 length, is divided into 32 code characters, every group 4.Use is directly configured by network
Basic midamble code, and after setting up down-going synchronous, mobile terminal be also know used in basic midamble code's group.?
In existing TD-SCDMA standard, to a cell, a basic midamble code, a downlink frequency pilot code and a scrambling code are distributed,
Wherein basic midamble code and scrambling code have --- corresponding relationship, every four basic midamble codes and the corresponding downlink of four scrambling codes
Pilot code, referred to as a code character.Network can identify specific one by the Cell Parameter id field in higher layer message
Downlink frequency pilot code used in a cell or sector, basic midamble code and scrambling code, the message can pass through certain mode, such as net
Network can notify terminal by air-interface information high level, know base station and terminal by Iub interface message informing base station.
Basic midamble code can generate the intermediate code of different channels estimating window according to certain generation rule, the intermediate code
Two kinds of methods of salary distribution: default and common can be used in method of salary distribution system.Default and common mode is according to one
Criterion predetermined is determined to define the corresponding relationship of intermediate code and each channel code.Each intermediate code can be with one or more
A channel code is corresponding, and the possible spreading factor having the same of these channel codes, it is also possible to have different spread spectrums
The factor.
Network can be carried out the information of the basic midamble code and scrambling code that use in this cell by certain message mode
Configuration and notice, the two have one-to-one relationship.Such as in CELL SETUP REQUEST message, in system broadcast message
Or in SIB5, Cell Parameter ID (cell parameter mark) parameter is configured.
And the intermediate code method of salary distribution that network can notify terminal to use by higher layer message, i.e. default is still
The method of salary distribution of common.The physical layer of terminal is used by the corresponding relationship of intermediate code predetermined and channel code and it
Corresponding intermediate code works.
For example, network is when configuring cell parameter, and such as in CELL SETUP REQUEST message, Cell
Parameter ID parameter only configures one, in system broadcast message, in SIB5, and Cell Parameter ID parameter
Only configure one.Cell Parameter ID parameter only represents one group of corresponding basic midamble code and scrambling code.In this way, system one
Denier specifies scrambling code and corresponding basic midamble code to some cell or sector, and all available channels are estimated in the cell or sector
The number that window number is less than all available channel codes is counted, as shown in Figure 1, showing intermediate code and channel code as K=16
Corresponding relationship, channel code includes in system、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、Totally 31, as K=16, channel estimation window has 16, can be really by basic midamble code's displacement
Fixed 16 intermediate codes.From figure 1 it appears that spreading factor is different, intermediate code and corresponding spreading code (i.e. channel code)
It is different.Therefore, when spreading factor is wrong, spreading code determined by receiver (i.e. channel code) is also correspondingly wrong, can not be quasi-
Really know the information for sending code channel, therefore, carries out Multiuser Detection reception and have bigger difficulty.
In addition, due to the associated detection technique in TD-SCDMA system be according to the training sequence part signal that receives and
We estimate channel impulse response by known training sequence, and spreading code is combined to estimate user's original signal.If intermediate code
Cannot be accurately corresponding with spreading code, channel impulse response and corresponding spreading code cannot be accurately obtained, to cannot accurately obtain
Obtain user's original signal.
The following table 1 is the statistical data from China Mobile to the analysis of cutting off rate:
| Weak covering (being consistently less than -95dBm) | Low C/I | Switching | It is other | |
| Cutting off rate | 16.33% | 51.02% | 22.45% | 10.2% |
Table 1.
It can be seen that the main reason for carrier/interface ratio (C/I) is call drop.Therefore current combined detection performance is in co-frequency cell
It is unsatisfactory in the case that interference is strong.
Summary of the invention
Therefore, it is necessary to a kind of method and apparatus for detecting inter-frequency interference cell spreading factor, can solve mentioned above
At least one problem.
For this purpose, according to the one side of the disclosure, providing a kind of for time-division synchronous code division multiple access TD-SCDMA wireless communication
The equipment of network.The equipment includes: input unit, is configured to receive the signal in current time slots；Channel estimating unit,
It is configured to carry out the channel estimation of inter-frequency interference cell to received signal to restore the interference letter of the inter-frequency interference cell
Number；Matched filtering unit is configured to carry out matched filtering to the interference signal of the recovery；Descrambling unit is configured to
Interference signal after the matched filtering is descrambled；First power calculation unit, it is dry after being configured to calculate the descrambling
Disturb the power of signal；Detection processing unit is configured to carry out detection processing so that working as to the interference signal after the descrambling
When interference signal after the descrambling is broadband signal its power reduce and when it is low frequency and narrow bandwidth signal its power it is constant or
It reduces less；Second power calculation unit is configured to calculate the power of the interference signal after the detection processing；Spreading factor
Determination unit is configured to the power of the interference signal after the power of the interference signal after the descrambling and the detection processing
Ratio is compared with predetermined threshold, if the ratio be greater than the predetermined threshold, it is determined that the spread spectrum of the inter-frequency interference cell because
Son is 1, otherwise, it determines the spreading factor of the inter-frequency interference cell is 16.
According to the one side of the disclosure, it provides a kind of for time-division synchronous code division multiple access TD-SCDMA cordless communication network
Method, comprising the following steps: receive current time slots in signal；The channel for carrying out inter-frequency interference cell to received signal is estimated
It counts to restore the interference signal of the inter-frequency interference cell；Matched filtering is carried out to the interference signal of the recovery；The matching is filtered
Interference signal after wave is descrambled；The power of interference signal after calculating the descrambling；Interference signal after the descrambling is carried out
Detection processing is so that it is low frequency and narrow bandwidth letter that its power, which reduces and works as it, when the interference signal after the descrambling is broadband signal
Number when its power it is constant or reduce it is less；The power of interference signal after calculating the detection processing；By the interference letter after the descrambling
Number power be compared with the ratio of the power of the interference signal after the detection processing with predetermined threshold, if the ratio is greater than
The predetermined threshold, it is determined that the spreading factor of the inter-frequency interference cell is 1, otherwise, it determines the spread spectrum of the inter-frequency interference cell because
Son is 16.
According to the one side of the disclosure, it provides a kind of for time-division synchronous code division multiple access TD-SCDMA cordless communication network
Entity, comprising: acquiring unit, be configured to obtain descrambling after inter-frequency interference cell interference signal；First power meter
Unit is calculated, is configured to calculate the power of the interference signal after the descrambling；Detection processing unit is configured to the descrambling
Rear interference signal carry out detection processing so that when the interference signal after the descrambling is broadband signal its power reduce and
When it is low frequency and narrow bandwidth signal, its power is constant or reduces less；Second power calculation unit is configured to calculate the inspection
Survey the power of treated interference signal；Spreading factor determination unit is configured to the function of the interference signal after the descrambling
Rate is compared with the ratio of the power of the interference signal after the detection processing with predetermined threshold, if the ratio is predetermined greater than this
Thresholding, it is determined that the spreading factor of the inter-frequency interference cell is 1, otherwise, it determines the spreading factor of the inter-frequency interference cell is 16.
According to another aspect of the present invention, a kind of computer program product is provided, including is stored in non-volatile memories Jie
Instruction in matter, described instruction when executing in the processor, the step of implementation according to the method for the embodiment of the present invention.
According to another aspect of the present invention, a kind of non-volatile memory medium is provided, stores instruction thereon, which works as
When executing in the processor, the step of implementation according to the method for the embodiment of the present invention.
According to another aspect of the present invention, a kind of wireless network entity is provided, cordless communication network, the network entity are used for
Include: memory, is configured to store instruction on it；Processing system is arranged for carrying out described instruction；Network interface is matched
It sets for sending or receiving data within a wireless communication network；Communication medium is configured to memory, processing system and network
Communication between interface；Wherein: when described instruction executes in the processing system, implementing side according to an embodiment of the present invention
The step of method.
Read by the detailed description of following current preferred mode and with reference to attached drawing, the disclosure aforementioned and
Other features and advantage will be apparent.The detailed description and the accompanying drawings are merely to illustrate the disclosure, rather than limit by institute
The scope of the present disclosure that attached the spirit and scope of the invention define.
Detailed description of the invention
In order to thoroughly understand content of this disclosure, below with reference to the following description carried out in conjunction with attached drawing, in attached drawing
In:
Fig. 1 shows the relationship between intermediate code and spreading code, spreading factor；
Fig. 2 shows the flow charts of the method according to an embodiment of the invention executed in the user terminal；
Fig. 3 shows the method for detection processing according to an embodiment of the invention；
Fig. 4 shows the block diagram of user terminal according to an embodiment of the invention；
Fig. 5 shows the block diagram of entity according to an embodiment of the invention；
Fig. 6 shows the block diagram of wireless network entity according to an embodiment of the invention；
Fig. 7 shows multi-cell joint detection and traditional joint under the conditions of Gaussian channel based on the embodiment of the present invention
The performance of detection compares；
Fig. 8 shows multi-cell joint detection and traditional connection under Case1 channel condition based on the embodiment of the present invention
The performance for closing detection compares；
Fig. 9 shows multi-cell joint detection and traditional connection under Case3 channel condition based on the embodiment of the present invention
The performance for closing detection compares.
Specific embodiment
In the following detailed description, with reference to as part thereof of attached drawing, wherein being diagrammatically shown in which
Specific embodiments of the present invention may be implemented.With these embodiments of enough datail descriptions, enable those skilled in the art
It realizes the present invention, and should be understood that in the case where not departing from the range of each embodiment of the present invention, embodiment can be carried out
Combination, or can use other embodiments and structure, logic and variation electrically can be made.Therefore, below detailed
Carefully description should not be taken as restrictive, and should be illustrative.The scope of the present invention be by appended claims and
What its equivalent limited.
Term used herein is used only for the purpose of describing specific embodiments, and is not intended to limit the present invention.Such as exist
Used in this like that, singular "one", " this " be intended to include equally plural form, unless context is clearly
It refers else.It is also understood that when used herein, term " includes " is specified to there is stated feature, entirety, step, behaviour
Make, element and/or component, but be not precluded appearance or the one or more of the other feature of addition, entirety, step, operation, element,
Component and/or its group.
Unless otherwise defined, otherwise term (including technical terms and scientific terms) used herein has and the present invention
The identical meaning that those of ordinary skill in the art are commonly understood by.Term used herein should be interpreted that have and its
The context of the specification and in relation to the consistent meaning of meaning in field, and cannot be with Utopian or too formal meaning
Justice is explained, unless be specially so defined herein.
Referring to show according to the method for the embodiment of the present invention, the frame of device (system) and/or computer program product
Figure and/or the flow chart description present invention.It should be understood that can realize that block diagram and or flow chart is shown by computer program instructions
One box of figure and the combination of box.These computer program instructions can be supplied to universal computing device, dedicated meter
Calculate equipment processor and/or other programmable data processing units so that via calculating device handler and/or other compiling
The instruction that journey data processing equipment executes creates for realizing the side of function action specified in block diagram and or flow chart block
Method.
Correspondingly, the present invention can also be implemented with hardware and/or software (including firmware, resident software, microcode etc.).More
Further, the present invention can take computer usable or the shape of the computer program product on computer readable storage medium
Formula has the computer realized in the medium usable or computer readable program code, to be made by instruction execution system
It is used with or in conjunction with instruction execution system.In the context of the present invention, computer can be used or computer-readable medium can be with
It is arbitrary medium, may include, stores, communicates, transmits or transmit program, is made by instruction execution system, device or equipment
With, or instruction execution system, device or equipment is combined to use.
Below in conjunction with attached drawing, referring to the embodiment of the present invention description present invention.
Fig. 1 shows the relationship between intermediate code and spreading code, spreading factor.When intermediate code is distributed in a manner of defaulting,
Kcell=8, then as spreading factor SF=1, channel code (i.e. spreading code)=1, and only correspond to a channel window。
When SF=16, channel code (i.e. spreading code) is as follows:
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The wherein corresponding channel window of every two channel code, such asWithCorresponding same channel window。
Fig. 2 shows the flow charts of the method according to an embodiment of the invention executed in the user terminal.Used here as
Term " user terminal " (or referred to as " UE ") can indicate any type of equipment for being able to carry out wireless communication, can be just
Take formula, pocket-type, handheld device, such as mobile phone, smart phone, personal numerical value assistant, the equipment including computer installation
(such as desktop computer, laptop computer, vehicle, measuring instrument, household electrical appliance, Medical Devices, multimedia equipment) etc., they
Voice and/or data can be transmitted via Radio Access Network.
Firstly, receiving the signal in current time slots in step 202.The physical channel of TD-SCDMA system using system-frame,
4 layers of radio frames, subframe and time slot structure.Multiple radio frames form system-frame, and the radio frames that a length is 10ms are complete by two
The subframe that exactly the same length is 5ms forms, and each subframe is by different time slot academic titles.Time slot is to distinguish different letters in the time domain
Road, spreading code are that different channels is distinguished on frequency domain, i.e., different users can by different time slot or spreading code into
The transmission of row data.Divide special time slot and regular time slots in TD-SCDMA system, regular time slots length is 675 μ s, and structure is such as
Shown in lower:
Table 2:TD-SCDMA structure of time slot.
It can thus be seen that including two data segments, an intermediate code and a protection interval in a structure of time slot.Its
In, intermediate code is located between two data fields, without band spectrum modulation, is used for channel estimation.Due to the duration pole of time slot
It is short, therefore the shock response of channel can be regarded as constant, to be estimated by training sequence channel punching in a time slot
It hits response and is used directly for both sides data field and detected.
In step 204, the channel estimation for carrying out inter-frequency interference cell to received signal is small to restore the co-channel interference
The interference signal in area.Before carrying out channel estimation, the training sequence that is first needed.This is usually existing based on TD-SCDMA
What the user terminal of standard can be realized.Furtherly, user terminal believes radio frequency (Radio Frequency, referred to as " RF ")
Number by preamplifier amplify, the preamplifier be usually low-noise amplifier (Low Noise Amplifier, referred to as
" LNA "), then demodulated, amplification low pass, analog-to-digital conversion and finite impulse response filtering, and will be rung through finite impulse
The signal obtained after should filtering carries out data separating, obtains the data and training sequence of inter-frequency interference cell.It is marked in TD-SCDMA
In standard, which is intermediate code.These are all the prior arts, and details are not described herein for detail.Hereafter, to obtained instruction
Practice sequence and carries out channel estimation.Such as channel estimation can be realized by Steiner estimator, it may be assumed that
(1)
Wherein, RM is the intermediate code part that user terminal receives, and BM is basic midamble code,For the knot of channel estimation
Fruit.It can be found in document Steiner, Bernd, and Paul using the concrete scheme that Steiner estimator carries out channel estimation
Walter Baier, “Low Cost Channel Estimation in the Uplink Receiver of CDMA
Mobile Radio Systems, " FREQUENZE, 47 (1993) 11-12 are no longer described in detail here.And obtain letter
The interference signal for restoring the inter-frequency interference cell after channel shock response again is also it is known in the art that no longer superfluous in detail here
It states.
It will be understood by those skilled in the art that user terminal received signal is distributed in multiple channel windows, of channel window
Number is by KcellIt determines, KcellIt is notified by high level, value can be 2,4,6,8,10,12,14,16.Then the window of each channel window is long
Len=128/Kcell(referring specifically to agreement " 25.221 V10.0.0 of 3GPP TS ").In the present embodiment, with Kcell = 8
For be illustrated, then len=16, the result of channel estimationChannel estimation results comprising 8 windows.
Optionally, the number of the movable channel window of the inter-frequency interference cell is obtained according to the result of channel estimation, if
The number is greater than 1(step 206), then can determine that the spreading factor of the inter-frequency interference cell is 16.Optionally, in movable letter
In the case that road window number is greater than 1, the calculating of following power still can be carried out to determine spreading factor.
In step 208, matched filtering is carried out to the interference signal of the recovery.By way of example and not limitation, matched filtering can
To take following manner:
(2)
WhereinIt is the signal after matched filtering, A is the sytem matrix of inter-frequency interference cell, and e is the co-channel interference restored
The interference signal of cell, and only include data portion, H indicates conjugate transposition.
Then in step 210, the interference signal after the matched filtering is descrambled.By way of example and not limitation, descramble
Following manner can be taken:
(3)
Wherein d indicate descrambling after signal, v is compound scrambling code, wherein each element value in set 1, j, -1, -
j}.Indicate the dot-product operation of vector.
Then in step 210, the power of the interference signal after calculating the descrambling.By way of example and not limitation, after the descrambling
Interference signal power can calculate it is as follows:
(4)
WhereinIt is the power of single chip.
Simultaneously or in succession with step 210, in step 216, to the interference signal after the descrambling carry out detection processing with
So that when the interference signal after the descrambling is broadband signal its power reduce and when it is low frequency and narrow bandwidth signal its power
Constant or reduction is less.According to an example, it is illustrated with reference to method of the Fig. 3 to detection processing of the present invention.After descrambling
Signal is successively grouped according to every 16 one group since first chip, wherein a total of 704 chips, such one be there are
To 44 groups, for each group, such as, by preceding 8 codes
PieceWith rear 8 chipsSequentially corresponding be added is formed newly
8 chips, by 8 codes preceding in every group
PieceWith rear 8 chipsSequentially it is corresponding subtract each other to be formed it is new
8 chipsOr(not shown).16 newly obtained in this way
The position of each of a chip in each group can be arbitrary.Each group of above-mentioned 44 groups of chips is similarly handled
Obtain 44 groups of new chips, i.e., 704 new chips, be denoted as}.Fig. 3 gives intuitive solution to this algorithm
It releases.Available by mathematical derivation, when SF=16, the power of the interference signal after detection processing is the descrambling according to the example
Twice of the power of interference signal afterwards, and work as SF=1, the power of the interference signal after detection processing is almost according to the example
Zero, the case where so as to distinguish SF=1 and SF=16.According to another example, detected by the way of low-pass filtering
Processing, obtain new chip}.Since the signal of SF=16 is square wave, belong to low frequency and narrow bandwidth signal, and SF=1
Signal is broadband signal, and power spectrum covers the bandwidth of the entire 1.28M of TD-SCDMA system, therefore, cutoff frequency is rationally arranged
Rate, the power for the signal for carrying out low-pass filtering when can greatly reduce SF=1, appropriate signal when reducing or not reducing SF=16
Power, the case where so as to distinguish SF=1 and SF=16.
By way of example and not limitation, the power of the interference signal after the detection processing can calculate as follows:
(5)
In step 218, by the power of the interference signal after the power of the interference signal after the descrambling and the detection processing
Ratio is compared with predetermined threshold: if the ratio is greater than the predetermined threshold, determining the inter-frequency interference cell in step 222
Spreading factor be 1, otherwise, step 220 determine the inter-frequency interference cell spreading factor be 16.
It will be understood by those skilled in the art that the determination of predetermined threshold can be according to emulation experiment or statistical result.
Optionally, the calculating of above-mentioned power can be carried out just for the partial data chip of the interference signal.According to above-mentioned
In conjunction with the example that Fig. 3 is described, the number of the fractional chips is preferably 16 multiple.
Step in above embodiments is understood not to restrictive, religion of the those skilled in the art in above embodiments
It leads down, above steps can be executed with various reasonable, possible sequences.
Illustrate the performance of the embodiment of the present invention below by way of simulation result.The spreading factor of interfered cell can be by this hair
The bright embodiment detects, is based on the testing result, and multi-cell joint detection can distinguish the spread-spectrum configurations of interfered cell, especially
It is the case where can correctly detecting SF=1, to significantly improve the performance of joint-detection.Fig. 7, Fig. 8 and Fig. 9 are shown
The joint-detection of joint-detection and existing default inter-frequency interference cell SF=16 based on spreading factor testing result of the present invention
The comparison of energy, Fig. 7 is under the conditions of Gaussian channel, and Fig. 8 is under case1 channel condition, and Fig. 9 is under case3 channel condition.
Under the conditions of Gaussian channel, the two even has the difference of 10dB.The configuration that Fig. 6-8 is based on following table is emulated:
Table 3:TD-SCDMA joint-detection simulation configurations.
Fig. 4 shows the block diagram of user terminal according to an embodiment of the invention.In Fig. 4, user terminal 400 includes defeated
Enter unit 404, channel estimating unit 406, matched filtering unit 408, Descrambling unit 410, the first power calculation unit 412, inspection
Survey processing unit 414, the second power calculation unit 416 and spreading factor determination unit 418.It should be understood that user terminal 400
These shown elements are not limited to, but may include other conventional elements, and add ons for other purposes.
Input unit 404 is configured to receive the signal in current time slots.
Channel estimating unit 406, be configured to received signal carry out inter-frequency interference cell channel estimation so as to
Restore the interference signal of the inter-frequency interference cell.By way of example and not limitation, the mode of specific channel estimation combines in front
The description of formula (1) provides.
Matched filtering unit 408 is configured to carry out matched filtering to the interference signal of the recovery.As an example rather than
Limitation, the mode of specific matched filtering combine the description of formula (2) to provide in front.
Descrambling unit 410 is configured to descramble the interference signal after the matched filtering.As an example rather than limit
System, the mode specifically descrambled combine the description of formula (3) to provide in front.
First power calculation unit 412 is configured to calculate the power of the interference signal after the descrambling.As an example and
Unrestricted, specific calculation combines the description of formula (4) to provide in front.
Detection processing unit 414 is configured to carry out detection processing to the interference signal after the descrambling so that when should
Its power reduces when interference signal after descrambling is broadband signal and when it is low frequency and narrow bandwidth signal, its power is constant or drops
It is low less.The description of Fig. 3 is combined to provide in front according to an exemplary specific detection processing mode.It can by mathematical derivation
To obtain, when SF=16, the power of the interference signal after detection processing is the power of the interference signal after the descrambling according to the example
Twice, and work as SF=1, the power of the interference signal after detection processing is almost nil according to the example, so as to distinguish SF
The case where=1 and SF=16.According to another example, detection processing is carried out by the way of low-pass filtering.Due to the signal of SF=16
It is square wave, belongs to low frequency and narrow bandwidth signal, and the signal of SF=1 is broadband signal, it is entire that power spectrum covers TD-SCDMA system
Therefore cutoff frequency is rationally arranged in the bandwidth of 1.28M, the power for the signal for carrying out low-pass filtering when can greatly reduce SF=1 is fitted
When the power of the signal reduced or when not reducing SF=16, the case where so as to distinguish SF=1 and SF=16.
Second power calculation unit 416 is configured to calculate the power of the interference signal after the detection processing.As act
Example rather than limit, specific calculation combines the description of formula (5) to provide in front.
Spreading factor determination unit 418 is configured to the power of the interference signal after the descrambling and the detection processing
The ratio of the power of interference signal afterwards is compared with predetermined threshold, if the ratio is greater than the predetermined threshold, it is determined that should
The spreading factor of inter-frequency interference cell is 1, otherwise, it determines the spreading factor of the inter-frequency interference cell is 16.
It will be understood by those skilled in the art that the determination of predetermined threshold can be according to emulation experiment or statistical result.
Optionally, the first power calculation unit and the second power calculation unit are configured to the portion just for the interference signal
Divided data chip carries out power calculation.According to the example that above-mentioned combination Fig. 3 is described, the number of the fractional chips is preferably 16
Multiple.
Optionally, user terminal further includes spreading factor pre-determining unit 402, is configured to the knot according to channel estimation
Fruit obtains the number of the movable channel window of the inter-frequency interference cell, if the number is greater than 1, can determine the co-channel interference
The spreading factor of cell is 16.Optionally, in the case where movable channel window number is greater than 1, it still can pass through above-mentioned function
The calculating of rate determines spreading factor.
Element 402-416 is shown as independent element in Fig. 4.However, this simply means to show them functionally to be only
Vertical.However other arrangements are also possible.It can be to be located at the software of any position, any combination of hardware and/or firmware
To realize any combination of these elements.
The spreading factor of interfered cell can the embodiment through the invention detect, be based on the testing result, it is how small
The case where area's joint-detection can distinguish the spread-spectrum configurations of interfered cell, can especially correctly detect SF=1, thus greatly
The performance of ground improvement joint-detection.
Fig. 5 shows the block diagram of entity according to an embodiment of the invention.In Fig. 5, entity 500 includes acquiring unit
502, the first power calculation unit 506, detection processing unit 508, the second power calculation unit 510, spreading factor determination unit
512.It it should be understood that entity 500 is not limited to these shown elements, but may include other conventional elements, and
Add ons for other purposes.Entity 500 can be built in user terminal, user terminal can also be external in, by having
Line is wirelessly connected.
Acquiring unit 502 is configured to obtain the interference signal of the inter-frequency interference cell after descrambling.The acquisition can be with
It is that can pass through wired or wireless connection based on request or based on notice.
First power calculation unit 506 is configured to calculate the power of the interference signal after the descrambling.As an example and
Unrestricted, specific calculation combines the description of formula (4) to provide in front.
Detection processing unit 508 is configured to carry out detection processing to the interference signal after the descrambling so that when should
Its power reduces when interference signal after descrambling is broadband signal and when it is low frequency and narrow bandwidth signal, its power is constant or drops
It is low less.The description of Fig. 3 is combined to provide in front according to an exemplary specific detection processing mode.It can by mathematical derivation
To obtain, when SF=16, the power of the interference signal after detection processing is the power of the interference signal after the descrambling according to the example
Twice, and work as SF=1, the power of the interference signal after detection processing is almost nil according to the example, so as to distinguish SF
The case where=1 and SF=16.According to another example, detection processing is carried out by the way of low-pass filtering.Due to the signal of SF=16
It is square wave, belongs to low frequency and narrow bandwidth signal, and the signal of SF=1 is broadband signal, it is entire that power spectrum covers TD-SCDMA system
Therefore cutoff frequency is rationally arranged in the bandwidth of 1.28M, the power for the signal for carrying out low-pass filtering when can greatly reduce SF=1 is fitted
When the power of the signal reduced or when not reducing SF=16, the case where so as to distinguish SF=1 and SF=16.
Second power calculation unit 510 is configured to calculate the power of the interference signal after the detection processing.As act
Example rather than limit, specific calculation combines the description of formula (5) to provide in front.
Spreading factor determination unit 512 is configured to the power of the interference signal after the descrambling and the detection processing
The ratio of the power of interference signal afterwards is compared with predetermined threshold, if the ratio is greater than the predetermined threshold, it is determined that should
The spreading factor of inter-frequency interference cell is 1, otherwise, it determines the spreading factor of the inter-frequency interference cell is 16.
It will be understood by those skilled in the art that the determination of predetermined threshold can be according to emulation experiment or statistical result.
Optionally, the first power calculation unit and the second power calculation unit are configured to the portion just for the interference signal
Divided data chip carries out power calculation.According to the example that above-mentioned combination Fig. 3 is described, the number of the fractional chips is preferably 16
Multiple.
Optionally, entity 500 further includes spreading factor pre-determining unit 504, is configured to the knot according to channel estimation
Fruit obtains the number of the movable channel window of the inter-frequency interference cell, if the number is greater than 1, can determine the co-channel interference
The spreading factor of cell is 16.Optionally, in the case where movable channel window number is greater than 1, it still can pass through above-mentioned function
The calculating of rate determines spreading factor.
Element 502-512 is shown as independent element in Fig. 5.However, this simply means to show them functionally to be only
Vertical.However other arrangements are also possible.It can be to be located at the software of any position, any combination of hardware and/or firmware
To realize any combination of these elements.The entity 500 can be built in user terminal, can also be with for example wired or wireless
Mode be external in user terminal or any can provide the equipment of the data obtained needed for acquiring unit 502.
The spreading factor of interfered cell can the embodiment through the invention detect, be based on the testing result, it is how small
The case where area's joint-detection can distinguish the spread-spectrum configurations of interfered cell, can especially correctly detect SF=1, thus greatly
The performance of ground improvement joint-detection.
Fig. 6 shows the block diagram of wireless network entity according to an embodiment of the invention.In Fig. 6, wireless network entity
600 include memory 601, processing system 602, network interface 603 and communication medium 604.It should be understood that wireless network entity
600 are not limited to these shown elements, but may include other conventional elements, and additional member for other purposes
Part.
Memory 601 include be capable of storing data and/or computer executable instructions one or more computers it is available
Or computer-readable storage medium.It should be understood that storage medium is preferably non-volatile memory medium.
Processing system 602 includes one or more processing units.Processing unit includes one or more integrated circuits
Physical equipment or product, the integrated circuit read from such as computer-readable medium of memory 601 data and instruction and
Selectively execute instruction.In embodiments, processing system 602 is implemented in various ways.For example, processing system 602 can be with
It is embodied as one or more processing cores.In another example, processing system 602 may include one or more independent micro- places
Manage device.In another example, processing system 602 may include providing the integrated circuit specific to application of specific function
(ASIC) in an also example, processing system 602 is provided by using ASIC and by executing computer executable instructions
Specific function.
Network interface 603 is so that wireless network entity 600 sends data to communication network or therefrom receives data
Equipment or product.In various embodiments, network interface 603 is implemented in different ways.For example, network interface 603 can be with
It is embodied as supporting TD-SCDMA standard.
Communication medium 604 is for the communication between each hardware component of wireless network entity 600.In the example of fig. 6,
Communication medium is for the communication between memory 601, processing system 602 and network interface 603.Communication medium can be with various sides
Formula is implemented.For example, communication medium 604 may include pci bus, universal serial bus, graphics acceleration port (AGP), serial advanced skill
Art attachment (ATA) interconnection, Parallel ATA interconnection, fiber channel interconnection, usb bus, Small Computing System Interface (SCSI) or its
The communication medium of its type.
Memory 601 stores various types of data and/or software instruction.For example, working as storage in example in Fig. 6
When the instruction stored in device 601 executes in processing system 602, the step according to above-mentioned method described in reference diagram 2 can be implemented
Suddenly.
The spreading factor of interfered cell can the embodiment through the invention detect, be based on the testing result, it is how small
The case where area's joint-detection can distinguish the spread-spectrum configurations of interfered cell, can especially correctly detect SF=1, thus greatly
The performance of ground improvement joint-detection.
Claims (17)
1. a kind of user terminal for time-division synchronous code division multiple access TD-SCDMA cordless communication network, comprising:
Input unit (404) is configured to receive the signal in current time slots；
Channel estimating unit (406) is configured to carry out the channel estimation of inter-frequency interference cell to received signal so as to extensive
The interference signal of the multiple inter-frequency interference cell；
Matched filtering unit (408) is configured to carry out matched filtering to the interference signal of the recovery；
Descrambling unit (410) is configured to descramble the interference signal after the matched filtering；
First power calculation unit (412) is configured to calculate the power of the interference signal after the descrambling；
Detection processing unit (414) is configured to carry out detection processing to the interference signal after the descrambling so that when the solution
Its power reduces when interference signal after disturbing is broadband signal and its power is not reduced or dropped when it is low frequency and narrow bandwidth signal
It is low less；
Second power calculation unit (416) is configured to calculate the power of the interference signal after the detection processing；
Spreading factor determination unit (418), being configured to will be after the power of the interference signal after the descrambling and the detection processing
The ratio of power of interference signal be compared with predetermined threshold, if the ratio is greater than the predetermined threshold, it is determined that this is same
The spreading factor of frequency interfered cell is 1, otherwise, it determines the spreading factor of the inter-frequency interference cell is 16.
2. user terminal as described in claim 1, wherein the detection processing unit is configured to be examined in the following ways
Survey processing:
Interference signal after the descrambling is sequentially grouped, every group of 16 chips；
By 8 chips preceding in every groupWith rear 8 chips
Sequentially corresponding be added forms 8 new chips；
By 8 chips preceding in every groupWith rear 8 chipsIt is suitable
Secondary correspondence subtracts each other to form 8 new chipsOr。
3. user terminal as described in claim 1, wherein the detection processing unit be configured to using low-pass filtering mode into
Row detection processing.
4. user terminal as described in claim 1, further includes:
Spreading factor pre-determining unit (402) is configured to obtain the inter-frequency interference cell according to the result of channel estimation
The number of movable channel window, if the number is greater than 1, it is determined that the spreading factor of the inter-frequency interference cell is 16.
5. user terminal as described in claim 1, wherein the first power calculation unit and the configuration of the second power calculation unit are used
Power calculation is carried out in the partial data chip just for the interference signal.
6. a kind of method for time-division synchronous code division multiple access TD-SCDMA cordless communication network, comprising the following steps:
Receive the signal (202) in current time slots；
The channel estimation of inter-frequency interference cell is carried out to received signal to restore the interference signal of the inter-frequency interference cell
(204)；
Matched filtering (208) are carried out to the interference signal of the recovery；
(210) are descrambled to the interference signal after the matched filtering；
The power (212) of interference signal after calculating the descrambling；
To after the descrambling interference signal carry out detection processing so that when the interference signal after the descrambling is broadband signal its
Power reduces and its power does not reduce or reduce less (214) when it is low frequency and narrow bandwidth signal；
The power (216) of interference signal after calculating the detection processing；
By the ratio and predetermined threshold of the power of the interference signal after the power of the interference signal after the descrambling and the detection processing
(218) are compared, if the ratio is greater than the predetermined threshold, it is determined that the spreading factor of the inter-frequency interference cell is 1
(222), otherwise, it determines the spreading factor of the inter-frequency interference cell is 16(220).
7. method as claimed in claim 6, wherein the detection processing includes:
Interference signal after the descrambling is sequentially grouped, every group of 16 chips；
By 8 chips preceding in every groupWith rear 8 chipsIt is suitable
Secondary corresponding be added forms 8 new chips；
By 8 chips preceding in every groupWith rear 8 chips
Sequentially correspondence subtracts each other to form 8 new chips
Or。
8. method as claimed in claim 6, wherein carrying out detection processing using low-pass filtering mode.
9. method as claimed in claim 6, further includes:
The number of the movable channel window of the inter-frequency interference cell is obtained according to the result of channel estimation, if the number is greater than 1
(206), it is determined that the spreading factor of the inter-frequency interference cell is 16.
10. method as claimed in claim 6, wherein carry out power calculation just for the partial data chip of the interference signal.
11. a kind of entity for time-division synchronous code division multiple access TD-SCDMA cordless communication network, comprising:
Acquiring unit (502) is configured to obtain the interference signal of the inter-frequency interference cell after descrambling；
First power calculation unit (506) is configured to calculate the power of the interference signal after the descrambling；
Detection processing unit (508) is configured to carry out detection processing to the interference signal after the descrambling so that when the solution
Its power reduces when interference signal after disturbing is broadband signal and its power is not reduced or dropped when it is low frequency and narrow bandwidth signal
It is low less；
Second power calculation unit (510) is configured to calculate the power of the interference signal after the detection processing；
Spreading factor determination unit (512), being configured to will be after the power of the interference signal after the descrambling and the detection processing
The ratio of power of interference signal be compared with predetermined threshold, if the ratio is greater than the predetermined threshold, it is determined that this is same
The spreading factor of frequency interfered cell is 1, otherwise, it determines the spreading factor of the inter-frequency interference cell is 16.
12. entity as claimed in claim 11, wherein the detection processing unit is configured to be detected in the following ways
Processing:
Interference signal after the descrambling is sequentially grouped, every group of 16 chips；
By 8 chips preceding in every groupWith rear 8 chips
Sequentially corresponding be added forms 8 new chips；
By 8 chips preceding in every groupWith rear 8 chips
Sequentially correspondence subtracts each other to form 8 new chips
Or。
13. entity as claimed in claim 11, wherein the detection processing unit is configured to carry out using low-pass filtering mode
Detection processing.
14. entity as claimed in claim 11, wherein the acquiring unit is further configured small for obtaining the co-channel interference
The result of the channel estimation in area;And
The entity further include:
Spreading factor pre-determining unit (504) is configured to obtain the inter-frequency interference cell according to the result of the channel estimation
Movable channel window number, if the number be greater than 1, it is determined that the spreading factor of the inter-frequency interference cell is 16.
15. entity as claimed in claim 11, wherein the first power calculation unit and the second power calculation unit are configured to
Power calculation is carried out just for the partial data chip of the interference signal.
16. a kind of non-volatile memory medium stores instruction thereon, described instruction implements root when executing in the processor
The step of according to method described in any of claim 6-10.
17. a kind of wireless network entity is used for cordless communication network, comprising:
Memory (601), is configured to store instruction on it；
Processing system (602), is arranged for carrying out described instruction；
Network interface (603) is configured to send or receive data within a wireless communication network；
Communication medium (604), the communication being configured between memory, processing system and network interface；
Wherein:
When described instruction executes in the processing system, implement the method according to any of claim 6-10
The step of.
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| WO2001024396A1 (en) * | 1999-09-29 | 2001-04-05 | Nokia Mobile Phones Limited | Spread spectrum communication system |
| CN200962596Y (en) * | 2006-06-29 | 2007-10-17 | 凯明信息科技股份有限公司 | Device for reconstructing the cell signals of the TD-SCDMA system |
| CN101175296A (en) * | 2006-10-30 | 2008-05-07 | 大唐移动通信设备有限公司 | Ascending multi-code set associated detecting method and system |
| CN102387103A (en) * | 2010-08-31 | 2012-03-21 | 联芯科技有限公司 | Detection method and device for spread spectrum factors in co-frequency neighbor cells of time division-synchronization code division multiple access (TD-SCDMA) system |
| CN102440036A (en) * | 2009-04-08 | 2012-05-02 | 翁-兰普无线公司 | Dynamic energy control |
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| WO2002013395A2 (en) * | 2000-08-04 | 2002-02-14 | Telefonaktiebolaget Lm Ericsson (Publ) | Spreading factor detector |
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| WO2001024396A1 (en) * | 1999-09-29 | 2001-04-05 | Nokia Mobile Phones Limited | Spread spectrum communication system |
| CN200962596Y (en) * | 2006-06-29 | 2007-10-17 | 凯明信息科技股份有限公司 | Device for reconstructing the cell signals of the TD-SCDMA system |
| CN101175296A (en) * | 2006-10-30 | 2008-05-07 | 大唐移动通信设备有限公司 | Ascending multi-code set associated detecting method and system |
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