CN105099500A - Method and device for detecting spreading factor of same-frequency interference cell - Google Patents
Method and device for detecting spreading factor of same-frequency interference cell Download PDFInfo
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Abstract
The invention provides a device and a method for TD-SCDMA (time division synchronous code division multiple access) wireless communication network. The device comprises an input unit, a channel estimation unit, a matched filtering unit, a descrambling unit, a first power calculation unit, a detecting and processing unit, a second power calculation unit and a spreading factor determination unit, wherein the input unit receives signals in the current time slot; the channel estimation unit carries out channel estimation of a same-frequency interference cell on the received signals so as to recover interference signals of the same-frequency interference cell; the matched filtering unit carries out matched filtering on the recovered interference signals; the descrambling unit carries out descrambling on the matched filtered interference signals; the first power calculation unit calculates the power of the descrambled interference signals; the detecting and processing unit detects and processes the descrambled interference signals so as to enable the power of the descrambled interference signals to be reduced when the descrambled interference signals are broadband signals and enable the power of the descrambled interference signals to be unchanged or slightly reduced when the descrambled interference signals are low-frequency narrowband signals; the second power calculation unit calculates the power of the detected and processed interference signals; and the spreading factor determination unit compares the ratio between the power of the descrambled interference signals and the power of the detected and processed interference signals with a predetermined threshold so as to determine the spreading factor.
Description
Technical field
The present invention relates to moving communicating field, particularly relate to detection method and the device of the spreading factor of inter-frequency interference cell in TD-SCDMA system.
Background technology
The device described in this part can be implemented, but may not be by the method conceived in advance or carry out.Therefore, unless otherwise specified herein, otherwise the device described in this part for the claim in the application, being not prior art and not being recognized as prior art by being included in this part.In addition, all embodiments of the present disclosure need not solve whole (or even any one) in the problem proposed in this part.
Along with development and 3G (Third Generation) Moblie (3G) rise in the world of wireless communication technology, Radio Resource as a kind of limited resource, change more and more nervous.For the TD-SCDMA system that the mainstream standard of 3G is queried, its Radio Resource be assigned with is also very limited.In order to improve the availability of frequency spectrum of TD-SCDMA system, identical networking becomes a kind of effective solution.
In the TD-SCDMA system of identical networking, co-channel interference significantly increases.The effective ways of removal co-channel interference are the interference cancellation algorithm in joint-detection, and the input that interference cancellation algorithm needs is: Serving cell and inter-frequency interference cell information.If the spreading factor of the inter-frequency interference cell of reality is inconsistent with the spreading factor inputted as interference cancellation algorithm, the hydraulic performance decline of receiver can be caused.In order to improve the performance of receiver, the relevant information obtaining inter-frequency interference cell is exactly extremely important.
At present, owing to lacking the detection method to the spreading factor of inter-frequency interference cell, the spreading factor of inter-frequency interference cell is all defaulted as 16.But in practical situations both, in down channel, spreading factor has two kinds of possibilities: 1 or 16.If (such as the spreading factor of usual down channel is 1 in HSDPA technology) but uses 16 of acquiescence will cause decline to the performance of receiver when spreading factor is 1, affect the performance of joint-detection.
TD-SCDMA (TimeDivisionSynchronousCDMA, Time Division-Synchronous Code Division Multiple Access) associated detection technique that adopts in system is on the basis of traditional sensing techniques, make full use of and cause MAI(MultipleAddressInterfere, multi-access inference) all subscriber signals and the prior information of multipath, the joint detection process that the is mutually related separation of subscriber signal being used as a unification has been come, thus there is excellent interference free performance, reduce the requirement of system to power control accuracy, therefore uplink spectrum resource can more be effectively utilized, improve power system capacity significantly.
The object of joint-detection is exactly go out according to the spreading code of all users and channel impulse response estimation the primary signal that user sends.Therefore the prerequisite of joint detection algorithm is spreading code and the channel impulse response that can obtain all users.The training sequence Midamb1e(intermediate code for carrying out channel estimating is provided with in the frame structure) in TD-SCDMA system, just can estimate Xin Dao Red according to the training sequence signal received and our known training sequence and swash response, and determine spreading code, thus can estimating user primary signal.
The intermediate code used in same community is produced after cyclic shift by same basic midamble code.Whole system has 128 length to be the basic midamble code of 144chips, is divided into 32 code characters, often organizes 4.Directly configured the basic midamble code of use by network, and after setting up down-going synchronous, mobile terminal is also know used basic midamble code's group.In existing TD-SCDMA standard, to a community, distribute a basic midamble code, a downlink frequency pilot code and a scrambler, wherein basic midamble code and scrambler have---and corresponding relation, every four basic midamble codes and four corresponding downlink frequency pilot code of scrambler, be called a code character.Network can be identified by the CellParameterID field in higher layer message use in a concrete community or sector downlink frequency pilot code, basic midamble code and scrambler, this message can by certain mode, as network can pass through Iub interface message informing base station, by the high-rise notification terminal of air-interface information, base station and terminal are known.
Basic midamble code can produce the intermediate code of different channels estimating window according to certain generation rule, can adopt the two kinds of method of salary distribution: default and common in the method for salary distribution system of this intermediate code.Default and common mode defines the corresponding relation of intermediate code and each channel code according to certain predefined criterion.Each intermediate code can be corresponding with one or more channel code, and these channel codes may have identical spreading factor, also may have different spreading factors.
Network can be configured by the information of certain message mode by the basic midamble code used in this community and scrambler and be notified, the two has relation one to one.As in CELLSETUPREQUEST message, in system broadcast message or in SIB5, CellParameterID (cell parameter mark) parameter is configured.
And the midamble allocation mode that network can be used by higher layer message notification terminal, the i.e. method of salary distribution of default or common.The physical layer of terminal uses intermediate code corresponding thereto to carry out work by the corresponding relation of predefined intermediate code and channel code.
Such as, network is when allocating cell parameter, and as in CELLSETUPREQUEST message, CellParameterID parameter only configures one, and in system broadcast message, as in SIB5, CellParameterID parameter also only configures one.CellParameterID parameter only represents one group of corresponding basic midamble code and scrambler.Like this, system is once specify scrambler and corresponding basic midamble code to certain community or sector, in this community or sector, all available channel estimation window numbers are less than the number of all available channel codes, as shown in Figure 1, show the corresponding relation of intermediate code and channel code as K=16, in system, channel code comprises
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totally 31, as K=16, channel estimation window has 16, determines 16 intermediate codes by basic midamble code's displacement energy.As can be seen from Figure 1, spreading factor is different, and intermediate code and corresponding spreading code (i.e. channel code) are also different.Therefore, when spreading factor is wrong, the determined spreading code of receiver (i.e. channel code) is also correspondingly wrong, accurately can not know the information sending code channel, therefore, carries out Multiuser Detection reception and has larger difficulty.
In addition, because the associated detection technique in TD-SCDMA system estimates Xin Dao Red according to the training sequence part signal received and our known training sequence to swash response, and in conjunction with spreading code estimating user primary signal.If intermediate code can not be accurately corresponding with spreading code, just accurately can not obtain Xin Dao Red and swash response and corresponding spreading code, thus can not accurately obtain user's primary signal.
Following table 1 is from the statistics of China Mobile to the analysis of cutting off rate:
| Weak covering (continuing lower than-95dBm) | Low C/I | Switch | Other | |
| Cutting off rate | 16.33% | 51.02% | 22.45% | 10.2% |
Table 1.
Can find out that carrier/interface ratio (C/I) is the main cause of call drop.Therefore current combined detection performance is unsatisfactory when co-frequency cell is disturbed strong.
Summary of the invention
Therefore, need a kind of method and apparatus detecting inter-frequency interference cell spreading factor, at least one problem mentioned above can solving.
For this reason, according to one side of the present disclosure, provide a kind of equipment for time-division synchronous code division multiple access TD-SCDMA cordless communication network.This equipment comprises: input unit, and it is configured for the signal received in current time slots; Channel estimating unit, its signal be configured for receiving carries out the channel estimating of inter-frequency interference cell to recover the interference signal of this inter-frequency interference cell; Matched filtering unit, it is configured for and carries out matched filtering to the interference signal of this recovery; Descrambling unit, it is configured for and carries out descrambling to the interference signal after this matched filtering; First power calculation unit, it is configured for the power of the interference signal after calculating this descrambling; Check processing unit, its be configured for the interference signal after this descrambling carry out check processing with to make when the interference signal after this descrambling is broadband signal its power reduction and when it is low frequency and narrow bandwidth signal its power constant or reduce less; Second power calculation unit, it is configured for the power of the interference signal after calculating this check processing; Spreading factor determining unit, it is configured for the ratio of the power of the interference signal after by the power of the interference signal after this descrambling and this check processing and predetermined threshold compares, if this ratio is greater than this predetermined threshold, then determine that the spreading factor of this inter-frequency interference cell is 1, otherwise, determine that the spreading factor of this inter-frequency interference cell is 16.
According to one side of the present disclosure, a kind of method for time-division synchronous code division multiple access TD-SCDMA cordless communication network is provided, comprises the following steps: receive the signal in current time slots; The channel estimating of inter-frequency interference cell is carried out to recover the interference signal of this inter-frequency interference cell to the signal received; Matched filtering is carried out to the interference signal of this recovery; Descrambling is carried out to the interference signal after this matched filtering; Calculate the power of the interference signal after this descrambling; To the interference signal after this descrambling carry out check processing with to make when the interference signal after this descrambling is broadband signal its power reduction and when it is low frequency and narrow bandwidth signal its power constant or reduce less; Calculate the power of the interference signal after this check processing; The ratio of the power of the interference signal after the power of the interference signal after this descrambling and this check processing and predetermined threshold are compared, if this ratio is greater than this predetermined threshold, then determine that the spreading factor of this inter-frequency interference cell is 1, otherwise, determine that the spreading factor of this inter-frequency interference cell is 16.
According to one side of the present disclosure, provide a kind of entity for time-division synchronous code division multiple access TD-SCDMA cordless communication network, comprising: acquiring unit, it is configured for the interference signal of the inter-frequency interference cell after obtaining descrambling; First power calculation unit, it is configured for the power of the interference signal after calculating this descrambling; Check processing unit, its be configured for the interference signal after this descrambling carry out check processing with to make when the interference signal after this descrambling is broadband signal its power reduction and when it is low frequency and narrow bandwidth signal its power constant or reduce less; Second power calculation unit, it is configured for the power of the interference signal after calculating this check processing; Spreading factor determining unit, it is configured for the ratio of the power of the interference signal after by the power of the interference signal after this descrambling and this check processing and predetermined threshold compares, if this ratio is greater than this predetermined threshold, then determine that the spreading factor of this inter-frequency interference cell is 1, otherwise, determine that the spreading factor of this inter-frequency interference cell is 16.
According to a further aspect in the invention, provide a kind of computer program, comprise the instruction be stored on non-volatile memory medium, described instruction, when performing within a processor, implements the step of the method according to the embodiment of the present invention.
According to a further aspect in the invention, provide a kind of non-volatile memory medium, it stores instruction, this instruction, when performing within a processor, implements the step of the method according to the embodiment of the present invention.
According to a further aspect in the invention, provide a kind of wireless network entity, for cordless communication network, this network entity comprises: memory, and configuration is used for storing instruction thereon; Treatment system, configuration is used for performing described instruction; Network interface, configuration is used for sending within a wireless communication network or receiving data; Communication medium, is configured for memory, communication between treatment system and network interface; Wherein: when described instruction performs in described treatment system, implement the step of the method according to the embodiment of the present invention.
Read by the detailed description of following current preferred mode and with reference to accompanying drawing, foregoing and other feature of the present disclosure and advantage will become more obvious.These the detailed description and the accompanying drawings only for illustration of the disclosure, instead of limit the scope of the present disclosure defined by appended claims and equivalent thereof.
Accompanying drawing explanation
In order to more thoroughly understand content of the present disclosure, below with reference to following description carried out by reference to the accompanying drawings, in the accompanying drawings:
Fig. 1 illustrates the relation between intermediate code and spreading code, spreading factor;
Fig. 2 illustrates the flow chart of the method performed in the user terminal according to an embodiment of the invention;
Fig. 3 shows the method for check processing according to an embodiment of the invention;
Fig. 4 illustrates the block diagram of user terminal according to an embodiment of the invention;
Fig. 5 illustrates the block diagram of entity according to an embodiment of the invention;
Fig. 6 illustrates the block diagram of wireless network entity according to an embodiment of the invention;
Fig. 7 shows the Performance comparision based on the multi-cell joint detection of the embodiment of the present invention and traditional joint-detection under Gaussian channel condition;
Fig. 8 shows the Performance comparision based on the multi-cell joint detection of the embodiment of the present invention and traditional joint-detection under Case1 channel condition;
Fig. 9 shows the Performance comparision based on the multi-cell joint detection of the embodiment of the present invention and traditional joint-detection under Case3 channel condition.
Embodiment
In the following detailed description, with reference to the accompanying drawing as its part, wherein diagrammatically show and wherein can realize specific embodiments of the invention.With enough details, these embodiments are described, those skilled in the art are made to realize the present invention, and should be appreciated that when not departing from the scope of each embodiment of the present invention, can combine embodiment, or other embodiments can be utilized and can make structure, logic and electrically on change.Therefore, detailed description below should not be considered restrictive, and should be illustrative.Scope of the present invention is by the claims of enclosing and equivalents thereof.
Term used herein only for describing the object of specific embodiment, and is not intended to limit the present invention.As used in this, " one " of singulative, " this " are intended to comprise plural form equally, unless context clearly refers else.It should also be understood that, when using at this, term " comprise " specify occur stating feature, entirety, step, operation, element and/or assembly, but do not get rid of and occur or add one or more further feature, entirety, step, operation, element, assembly and/or its group.
Unless otherwise defined, otherwise term used herein (comprising technical term and scientific terminology) has the same meaning jointly understood with those skilled in the art.Term used herein should be interpreted as having the meaning consistent with the meaning in its context at this specification and related fields, and can not explain with Utopian or too formal meaning, unless specially so defined at this.
Referring to the block diagram of the method illustrated according to the embodiment of the present invention, device (system) and/or computer program and/or flow chart, the present invention is described.Should be understood that and can realize a square frame of block diagram and/or flowchart illustration and the combination of square frame by computer program instructions.These computer program instructions can being supplied to universal computing device, the processor of dedicated computing equipment and/or other programmable data processing unit, making the instruction performed via computing equipment processor and/or other programmable data processing unit create method for realizing function/action specified in block diagram and/or flow chart block.
Correspondingly, the present invention can also be implemented with hardware and/or software (comprising firmware, resident software, microcode etc.).Further, the present invention can take computer to use or the form of computer program on computer-readable recording medium, it has the computer realized in media as well and can use or computer readable program code, to be used by instruction execution system or combined command executive system and using.In the context of the present invention, computer can use or computer-readable medium can be arbitrary medium, it can comprise, store, communicate, transmit or convey program, with by instruction execution system, device or equipment use, or combined command executive system, device or equipment use.
Below in conjunction with accompanying drawing, with reference to embodiments of the invention, the present invention is described.
Fig. 1 illustrates the relation between intermediate code and spreading code, spreading factor.When intermediate code is distributed in the mode of acquiescence, Kcell=8, then as spreading factor SF=1, channel code (i.e. spreading code)
=1, and an only corresponding channel window
.Work as SF=16, channel code (i.e. spreading code) is as follows:
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The wherein corresponding channel window of every two channel codes, such as
with
corresponding same channel window
.
Fig. 2 illustrates the flow chart of the method performed in the user terminal according to an embodiment of the invention.Term used herein " user terminal " (or being called for short " UE ") can indicate any type of equipment that can carry out radio communication, can be portable, pocket-type, handheld device, such as mobile phone, smart phone, individual's numerical value assistant, equipment (such as desktop computer, laptop computer, vehicle, measuring instrument, household electrical appliance, Medical Devices, multimedia equipment) comprising computer installation etc., they can transmit voice and/or data via Radio Access Network.
First, in step 202, receive the signal in current time slots.The physical channel of TD-SCDMA system adopts system-frame, radio frames, subframe and time slot 4 Rotating fields.Multiple radio frames composition system-frame, length is that the subframe that the radio frames of 10ms is 5ms by two identical length forms, and each subframe is by different time slot academic titles.Time slot is in time domain, distinguish different channels, and spreading code is on frequency domain, distinguish different channels, and namely different users can carry out the transmission of data by different time slots or spreading code.Point special time slot and regular time slots in TD-SCDMA system, regular time slots length is 675 μ s, and its structure is as follows:
Table 2:TD-SCDMA structure of time slot.
This shows, in a structure of time slot, comprise two data segments, an intermediate code and a protection interval.Wherein, intermediate code, between two data fields, does not carry out band spectrum modulation, for channel estimating.Because the duration of time slot is extremely short, therefore in a time slot, the impulse response of channel can be regarded as constant, and the channel impulse response estimated by training sequence can be directly used in both sides data field and detect.
In step 204, the channel estimating of inter-frequency interference cell is carried out to recover the interference signal of this inter-frequency interference cell to the signal received.Before carrying out channel estimating, first obtain the training sequence needed.This normally existing user terminal based on TD-SCDMA standard can realize.Furtherly, user terminal is by radio frequency (RadioFrequency, being called for short " RF ") signal amplifies through preamplifier, this preamplifier is generally low noise amplifier (LowNoiseAmplifier, be called for short " LNA "), then through demodulation, amplification low pass, analog-to-digital conversion and finite impulse response filtering, and the signal obtained after finite impulse response filtering is carried out data separating, obtain data and the training sequence of inter-frequency interference cell.In TD-SCDMA standard, this training sequence is intermediate code.These are all prior aries, and detail does not repeat them here.After this, channel estimating is carried out to the training sequence obtained.Such as, channel estimating can be realized by Steiner estimator, that is:
（1）
Wherein, RM is the intermediate code part that user terminal receives, and BM is basic midamble code,
for the result of channel estimating.Utilizing Steiner estimator to carry out the concrete scheme of channel estimating can see document Steiner, Bernd, andPaulWalterBaier, " LowCostChannelEstimationintheUplinkReceiverofCDMAMobileR adioSystems; " FREQUENZE, 47 (1993) 11-12, are no longer described in detail herein.And the interference signal recovering this inter-frequency interference cell after obtaining channel impulse response is more also well known in the art, be no longer described in detail herein.
It will be understood by those skilled in the art that signal distributions that user terminal receives is in multiple channel window, the number of channel window is by K
celldetermine, K
cellnotified by high level, its value can be 2,4,6,8,10,12,14,16.The then long len=128/K of window of each channel window
cell(specifically see agreement " 3GPPTS25.221V10.0.0 ").In the present embodiment, with K
cell=8 are described for example, then len=16, the result of channel estimating
comprise the channel estimation results of 8 windows.
Optionally, obtain the number of the channel window of the activity of this inter-frequency interference cell according to the result of channel estimating, if this number is greater than 1(step 206), then can determine that the spreading factor of this inter-frequency interference cell is 16.Optionally, when the channel window number of activity is greater than 1, still can carry out the calculating of following power to determine spreading factor.
In step 208, matched filtering is carried out to the interference signal of this recovery.Unrestricted as an example, matched filtering can be taked with under type:
（2）
Wherein
be the signal after matched filtering, A is the sytem matrix of inter-frequency interference cell, and e is the interference signal of the inter-frequency interference cell of recovering, and only comprises data division, and H represents conjugate transpose.
Then in step 210, descrambling is carried out to the interference signal after this matched filtering.Unrestricted as an example, descrambling can be taked with under type:
（3）
Wherein d represents the signal after descrambling, and v is compound scrambler, and wherein each element value is in set { 1, j ,-1 ,-j}.● represent the dot-product operation of vector.
Then in step 210, calculate the power of the interference signal after this descrambling.Unrestricted as an example, the power of the interference signal after this descrambling can be calculated as follows:
（4）
Wherein
the power of single chip.
With step 210 side by side or in succession, in step 216, to the interference signal after this descrambling carry out check processing with to make when the interference signal after this descrambling is broadband signal its power reduction and when it is low frequency and narrow bandwidth signal its power constant or reduce less.According to an example, the method with reference to figure 3 pairs of check processings of the present invention is described.Signal after descrambling is divided into groups according to every 16 one group successively from first chip, wherein always has 704 chips, obtain so altogether 44 groups, for each group, as
, by front 8 chips
with rear 8 chips
corresponding addition forms 8 new chips in turn
, will every front 8 chips in group
with rear 8 chips
corresponding subtracting each other forms 8 new chips in turn
or
(not shown).Each position in each group of new like this 16 chips obtained can be arbitrary.Same process is carried out to each group of above-mentioned 44 group code sheets and obtains 44 new group code sheets, 704 namely new chips, be designated as
.Fig. 3 gives this algorithm and explains intuitively.Can be obtained by mathematical derivation, work as SF=16, it is the twice of the power of interference signal after this descrambling according to the power of the interference signal after this example detection process, and work as SF=1, almost nil according to the power of the interference signal after this example detection process, thus the situation of SF=1 and SF=16 can be distinguished.According to another example, adopt the mode of low-pass filtering to carry out check processing, obtain new chip
.Signal due to SF=16 is square wave, belong to low frequency and narrow bandwidth signal, and the signal of SF=1 is broadband signal, its power spectrum covers the bandwidth of the whole 1.28M of TD-SCDMA system, therefore, rationally cut-off frequency is set, carries out the power of signal when low-pass filtering can greatly reduce SF=1, the power of suitable minimizing or signal when not reducing SF=16, thus the situation of SF=1 and SF=16 can be distinguished.
Unrestricted as an example, the power of the interference signal after this check processing can be calculated as follows:
（5）
In step 218, the ratio of the power of the interference signal after the power of the interference signal after this descrambling and this check processing and predetermined threshold are compared: if this ratio is greater than this predetermined threshold, then determine that the spreading factor of this inter-frequency interference cell is 1 in step 222, otherwise, determine that the spreading factor of this inter-frequency interference cell is 16 in step 220.
It will be understood by those skilled in the art that the determination of predetermined threshold can according to emulation experiment or statistics.
Optionally, the calculating of above-mentioned power can only be carried out for the partial data chip of this interference signal.According to the example that above-mentioned composition graphs 3 describes, the number of this fractional chips is preferably the multiple of 16.
Step in above embodiment should not be understood to restrictive, and those skilled in the art, under the instruction of above embodiment, can perform above steps with various rational, possible order.
The performance of the embodiment of the present invention is described below by way of simulation result.The spreading factor of interfered cell can be detected by this embodiment of the present invention, based on this testing result, multi-cell joint detection can distinguish the spread-spectrum configurations of interfered cell, especially correctly can detect the situation of SF=1, thus greatly improve the performance of joint-detection.Fig. 7, Fig. 8 and Fig. 9 show comparing based on the joint-detection of spreading factor testing result of the present invention and the combined detection performance of existing acquiescence inter-frequency interference cell SF=16, Fig. 7 is under Gaussian channel condition, Fig. 8 is under case1 channel condition, and Fig. 9 is under case3 channel condition.Under Gaussian channel condition, the two even has the difference of 10dB.Fig. 6-8 all emulates based on the configuration of following table:
Table 3:TD-SCDMA joint-detection simulation configurations.
Fig. 4 illustrates the block diagram of user terminal according to an embodiment of the invention.In the diagram, user terminal 400 comprises input unit 404, channel estimating unit 406, matched filtering unit 408, Descrambling unit 410, first power calculation unit 412, check processing unit 414, second power calculation unit 416 and spreading factor determining unit 418.It should be understood that user terminal 400 is not limited to these shown elements, but the element of other routine can be comprised, and for the add ons of other object.
Input unit 404, it is configured for the signal received in current time slots.
Channel estimating unit 406, its signal be configured for receiving carries out the channel estimating of inter-frequency interference cell to recover the interference signal of this inter-frequency interference cell.Unrestricted as an example, the mode of concrete channel estimating provides in conjunction with the description of formula (1) above.
Matched filtering unit 408, it is configured for and carries out matched filtering to the interference signal of this recovery.Unrestricted as an example, the mode of concrete matched filtering provides in conjunction with the description of formula (2) above.
Descrambling unit 410, it is configured for and carries out descrambling to the interference signal after this matched filtering.Unrestricted as an example, the mode of concrete descrambling provides in conjunction with the description of formula (3) above.
First power calculation unit 412, it is configured for the power of the interference signal after calculating this descrambling.Unrestricted as an example, concrete account form provides in conjunction with the description of formula (4) above.
Check processing unit 414, its be configured for the interference signal after this descrambling carry out check processing with to make when the interference signal after this descrambling is broadband signal its power reduction and when it is low frequency and narrow bandwidth signal its power constant or reduce less.Description according to concrete check processing mode composition graphs 3 above of an example provides.Can be obtained by mathematical derivation, work as SF=16, it is the twice of the power of interference signal after this descrambling according to the power of the interference signal after this example detection process, and work as SF=1, almost nil according to the power of the interference signal after this example detection process, thus the situation of SF=1 and SF=16 can be distinguished.According to another example, the mode of low-pass filtering is adopted to carry out check processing.Signal due to SF=16 is square wave, belong to low frequency and narrow bandwidth signal, and the signal of SF=1 is broadband signal, its power spectrum covers the bandwidth of the whole 1.28M of TD-SCDMA system, therefore, rationally cut-off frequency is set, carries out the power of signal when low-pass filtering can greatly reduce SF=1, the power of suitable minimizing or signal when not reducing SF=16, thus the situation of SF=1 and SF=16 can be distinguished.
Second power calculation unit 416, it is configured for the power of the interference signal after calculating this check processing.Unrestricted as an example, concrete account form provides in conjunction with the description of formula (5) above.
Spreading factor determining unit 418, it is configured for the ratio of the power of the interference signal after by the power of the interference signal after this descrambling and this check processing and predetermined threshold compares, if this ratio is greater than this predetermined threshold, then determine that the spreading factor of this inter-frequency interference cell is 1, otherwise, determine that the spreading factor of this inter-frequency interference cell is 16.
It will be understood by those skilled in the art that the determination of predetermined threshold can according to emulation experiment or statistics.
Optionally, the first power calculation unit and the second power calculation unit are configured for and only carry out power calculation for the partial data chip of this interference signal.According to the example that above-mentioned composition graphs 3 describes, the number of this fractional chips is preferably the multiple of 16.
Optionally, user terminal also comprises spreading factor pre-determining unit 402, it is configured for the number of the channel window obtaining the activity of this inter-frequency interference cell according to the result of channel estimating, if this number is greater than 1, then can determine that the spreading factor of this inter-frequency interference cell is 16.Optionally, when the channel window number of activity is greater than 1, still spreading factor can be determined by the calculating of above-mentioned power.
Element 402-416 is shown as independently element in the diagram.But this is only indicate them to be functionally independently.But other layout is also possible.Can to be positioned at any combination of the software of any position, hardware and/or firmware to realize any combination of these elements.
The spreading factor of interfered cell can be detected by this embodiment of the present invention, based on this testing result, multi-cell joint detection can distinguish the spread-spectrum configurations of interfered cell, especially correctly can detect the situation of SF=1, thus greatly improve the performance of joint-detection.
Fig. 5 illustrates the block diagram of entity according to an embodiment of the invention.In Figure 5, entity 500 comprises acquiring unit 502, first power calculation unit 506, check processing unit 508, second power calculation unit 510, spreading factor determining unit 512.It should be understood that entity 500 is not limited to these shown elements, but the element of other routine can be comprised, and for the add ons of other object.Entity 500 can be built in user terminal, also can be external in user terminal, is attached thereto connects by wired or wireless mode.
Acquiring unit 502, it is configured for the interference signal of the inter-frequency interference cell after obtaining descrambling.Described acquisition can be based on request or based on notice, can by wired or wireless connection.
First power calculation unit 506, it is configured for the power of the interference signal after calculating this descrambling.Unrestricted as an example, concrete account form provides in conjunction with the description of formula (4) above.
Check processing unit 508, its be configured for the interference signal after this descrambling carry out check processing with to make when the interference signal after this descrambling is broadband signal its power reduction and when it is low frequency and narrow bandwidth signal its power constant or reduce less.Description according to concrete check processing mode composition graphs 3 above of an example provides.Can be obtained by mathematical derivation, work as SF=16, it is the twice of the power of interference signal after this descrambling according to the power of the interference signal after this example detection process, and work as SF=1, almost nil according to the power of the interference signal after this example detection process, thus the situation of SF=1 and SF=16 can be distinguished.According to another example, the mode of low-pass filtering is adopted to carry out check processing.Signal due to SF=16 is square wave, belong to low frequency and narrow bandwidth signal, and the signal of SF=1 is broadband signal, its power spectrum covers the bandwidth of the whole 1.28M of TD-SCDMA system, therefore, rationally cut-off frequency is set, carries out the power of signal when low-pass filtering can greatly reduce SF=1, the power of suitable minimizing or signal when not reducing SF=16, thus the situation of SF=1 and SF=16 can be distinguished.
Second power calculation unit 510, it is configured for the power of the interference signal after calculating this check processing.Unrestricted as an example, concrete account form provides in conjunction with the description of formula (5) above.
Spreading factor determining unit 512, it is configured for the ratio of the power of the interference signal after by the power of the interference signal after this descrambling and this check processing and predetermined threshold compares, if this ratio is greater than this predetermined threshold, then determine that the spreading factor of this inter-frequency interference cell is 1, otherwise, determine that the spreading factor of this inter-frequency interference cell is 16.
It will be understood by those skilled in the art that the determination of predetermined threshold can according to emulation experiment or statistics.
Optionally, the first power calculation unit and the second power calculation unit are configured for and only carry out power calculation for the partial data chip of this interference signal.According to the example that above-mentioned composition graphs 3 describes, the number of this fractional chips is preferably the multiple of 16.
Optionally, entity 500 also comprises spreading factor pre-determining unit 504, it is configured for the number of the channel window obtaining the activity of this inter-frequency interference cell according to the result of channel estimating, if this number is greater than 1, then can determine that the spreading factor of this inter-frequency interference cell is 16.Optionally, when the channel window number of activity is greater than 1, still spreading factor can be determined by the calculating of above-mentioned power.
Element 502-512 is shown as independently element in Figure 5.But this is only indicate them to be functionally independently.But other layout is also possible.Can to be positioned at any combination of the software of any position, hardware and/or firmware to realize any combination of these elements.Described entity 500 can be built in user terminal, also can be external in user terminal or any equipment that can provide the required data obtained of acquiring unit 502 in such as wired or wireless mode.
The spreading factor of interfered cell can be detected by this embodiment of the present invention, based on this testing result, multi-cell joint detection can distinguish the spread-spectrum configurations of interfered cell, especially correctly can detect the situation of SF=1, thus greatly improve the performance of joint-detection.
Fig. 6 illustrates the block diagram of wireless network entity according to an embodiment of the invention.In figure 6, wireless network entity 600 comprises memory 601, treatment system 602, network interface 603 and communication medium 604.It should be understood that wireless network entity 600 is not limited to these shown elements, but the element of other routine can be comprised, and for the add ons of other object.
Memory 601 comprise can store data and/or computer executable instructions one or more computers can or computer-readable storage medium.Storage medium should be understood and be preferably non-volatile memory medium.
Treatment system 602 comprises one or more processing unit.Processing unit is the physical equipment or the goods that comprise one or more integrated circuit, and this integrated circuit reads data and instruction from the computer-readable medium of such as memory 601 and optionally performs instruction.In embodiments, treatment system 602 is implemented in every way.Such as, treatment system 602 may be embodied as one or more process core.In another example, treatment system 602 can comprise one or more independently microprocessor.In another example, treatment system 602 can comprise provides the integrated circuit (ASIC) specific to application of specific function. and going back in an example, treatment system 602 is by using ASIC and providing specific function by performing computer executable instructions.
Network interface 603 makes wireless network entity 600 send data to communication network or therefrom receive equipment or the goods of data.In various embodiments, network interface 603 is implemented in a different manner.Such as, network interface 603 may be embodied as and supports TD-SCDMA standard.
Communication medium 604 for wireless network entity 600 each nextport hardware component NextPort between communication.In the example of fig. 6, communication medium is used for memory 601, communication between treatment system 602 and network interface 603.Communication medium can be implemented in every way.Such as, communication medium 604 can comprise pci bus, universal serial bus, AGP (AGP), Serial Advanced Technology Attachment (ATA) is interconnected, Parallel ATA is interconnected, fiber channel is interconnected, the communication medium of usb bus, Small Computing System Interface (SCSI) or other type.
Memory 601 stores various types of data and/or software instruction.Such as, in example in figure 6, when the instruction stored in memory 601 performs in treatment system 602, the step according to above-mentioned method described in reference diagram 2 can be implemented.
The spreading factor of interfered cell can be detected by this embodiment of the present invention, based on this testing result, multi-cell joint detection can distinguish the spread-spectrum configurations of interfered cell, especially correctly can detect the situation of SF=1, thus greatly improve the performance of joint-detection.
Claims (18)
1., for a user terminal for time-division synchronous code division multiple access TD-SCDMA cordless communication network, comprising:
Input unit (404), it is configured for the signal received in current time slots;
Channel estimating unit (406), its signal be configured for receiving carries out the channel estimating of inter-frequency interference cell to recover the interference signal of this inter-frequency interference cell;
Matched filtering unit (408), it is configured for and carries out matched filtering to the interference signal of this recovery;
Descrambling unit (410), it is configured for and carries out descrambling to the interference signal after this matched filtering;
First power calculation unit (412), it is configured for the power of the interference signal after calculating this descrambling;
Check processing unit (414), it is configured for and carries out check processing to make when the interference signal after this descrambling is broadband signal its power reduction and its power does not reduce or reduces less when it is low frequency and narrow bandwidth signal to the interference signal after this descrambling;
Second power calculation unit (416), it is configured for the power of the interference signal after calculating this check processing;
Spreading factor determining unit (418), it is configured for the ratio of the power of the interference signal after by the power of the interference signal after this descrambling and this check processing and predetermined threshold compares, if this ratio is greater than this predetermined threshold, then determine that the spreading factor of this inter-frequency interference cell is 1, otherwise, determine that the spreading factor of this inter-frequency interference cell is 16.
2. user terminal as claimed in claim 1, wherein this check processing cell location is used for carrying out check processing in the following ways:
Interference signal after this descrambling is divided into groups in turn, often organizes 16 chips;
Will every front 8 chips in group
with rear 8 chips
corresponding addition forms 8 new chips in turn
;
Will every front 8 chips in group
with rear 8 chips
corresponding subtracting each other forms 8 new chips in turn
or
.
3. user terminal as claimed in claim 1, wherein this check processing cell location carries out check processing for adopting low-pass filtering mode.
4. user terminal as claimed in claim 1, also comprises:
Spreading factor pre-determining unit (402), it is configured for the number of the channel window obtaining the activity of this inter-frequency interference cell according to the result of channel estimating, if this number is greater than 1, then determines that the spreading factor of this inter-frequency interference cell is 16.
5. user terminal as claimed in claim 1, wherein, the first power calculation unit and the second power calculation unit are configured for only carries out power calculation for the partial data chip of this interference signal.
6., for a method for time-division synchronous code division multiple access TD-SCDMA cordless communication network, comprise the following steps:
Receive the signal (202) in current time slots;
The channel estimating of inter-frequency interference cell is carried out to recover the interference signal (204) of this inter-frequency interference cell to the signal received;
Matched filtering (208) is carried out to the interference signal of this recovery;
Descrambling (210) is carried out to the interference signal after this matched filtering;
Calculate the power (212) of the interference signal after this descrambling;
Check processing is carried out to make when the interference signal after this descrambling is broadband signal its power reduction and its power does not reduce or reduce less (214) when it is low frequency and narrow bandwidth signal to the interference signal after this descrambling;
Calculate the power (216) of the interference signal after this check processing;
The ratio of the power of the interference signal after the power of the interference signal after this descrambling and this check processing and predetermined threshold are compared (218), if this ratio is greater than this predetermined threshold, then determine that the spreading factor of this inter-frequency interference cell is 1(222), otherwise, determine that the spreading factor of this inter-frequency interference cell is 16(220).
7. method as claimed in claim 6, wherein said check processing comprises:
Interference signal after this descrambling is divided into groups in turn, often organizes 16 chips;
Will every front 8 chips in group
with rear 8 chips
corresponding addition forms 8 new chips in turn
;
Will every front 8 chips in group
with rear 8 chips
corresponding subtracting each other forms 8 new chips in turn
or
.
8. method as claimed in claim 6, wherein adopts low-pass filtering mode to carry out check processing.
9. method as claimed in claim 6, also comprises:
The number of the channel window of the activity of this inter-frequency interference cell is obtained, if this number is greater than 1(206 according to the result of channel estimating), then determine that the spreading factor of this inter-frequency interference cell is 16.
10. method as claimed in claim 6, wherein, the partial data chip only for this interference signal carries out power calculation.
11. 1 kinds, for the entity of time-division synchronous code division multiple access TD-SCDMA cordless communication network, comprising:
Acquiring unit (502), it is configured for the interference signal of the inter-frequency interference cell after obtaining descrambling;
First power calculation unit (506), it is configured for the power of the interference signal after calculating this descrambling;
Check processing unit (508), it is configured for and carries out check processing to make when the interference signal after this descrambling is broadband signal its power reduction and its power does not reduce or reduces less when it is low frequency and narrow bandwidth signal to the interference signal after this descrambling;
Second power calculation unit (510), it is configured for the power of the interference signal after calculating this check processing;
Spreading factor determining unit (512), it is configured for the ratio of the power of the interference signal after by the power of the interference signal after this descrambling and this check processing and predetermined threshold compares, if this ratio is greater than this predetermined threshold, then determine that the spreading factor of this inter-frequency interference cell is 1, otherwise, determine that the spreading factor of this inter-frequency interference cell is 16.
12. entities as claimed in claim 11, wherein this check processing cell location is used for carrying out check processing in the following ways:
Interference signal after this descrambling is divided into groups in turn, often organizes 16 chips;
Will every front 8 chips in group
with rear 8 chips
corresponding addition forms 8 new chips in turn
;
Will every front 8 chips in group
with rear 8 chips
corresponding subtracting each other forms 8 new chips in turn
or
.
13. entities as claimed in claim 11, wherein this check processing cell location carries out check processing for adopting low-pass filtering mode.
14. entities as claimed in claim 11, wherein this acquiring unit is arranged to the result of the channel estimating obtaining this inter-frequency interference cell further; And
This entity also comprises:
Spreading factor pre-determining unit (504), it is configured for the number of the channel window obtaining the activity of this inter-frequency interference cell according to the result of this channel estimating, if this number is greater than 1, then determines that the spreading factor of this inter-frequency interference cell is 16.
15. entities as claimed in claim 11, wherein, the first power calculation unit and the second power calculation unit are configured for only carries out power calculation for the partial data chip of this interference signal.
16. 1 kinds of computer programs, comprise the instruction be stored on non-volatile memory medium, and described instruction, when performing within a processor, implements the step according to the method in claim 6-10 described in any one.
17. 1 kinds of non-volatile memory mediums, it stores instruction, and described instruction, when performing within a processor, implements the step according to the method in claim 6-10 described in any one.
18. 1 kinds of wireless network entity, for cordless communication network, comprising:
Memory (601), configuration is used for storing instruction thereon;
Treatment system (602), configuration is used for performing described instruction;
Network interface (603), configuration is used for sending within a wireless communication network or receiving data;
Communication medium (604), is configured for memory, communication between treatment system and network interface;
Wherein:
When described instruction performs in described treatment system, implement the step according to the method in claim 6-10 described in any one.
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