CN101167287A - Fat path processing method for CDMA system - Google Patents
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- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/711—Interference-related aspects the interference being multi-path interference
- H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
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Abstract
The invention relates to a method for processing a fat path of a CDMA system, which adopts the technical scheme that: when two multipaths are close to each other, if the energy of the two multipaths is equivalent, the two multipaths can only slide in the back-away direction or keep in place; if the energy of one of the multipaths is obviously stronger than that of the other multipath, the strong path can slide freely, and the weak path can only slide towards the direction departing from the strong path. A rule may be added to the above to further improve performance, that is, when the multipath with weaker energy is too close to the strong path and is further slid toward the strong path, the weak path is deleted. The method of the invention can keep stable multipath update when processing the multipath update relatively close, and prevent the multipath from sliding to one block, thereby improving the demodulation performance.
Description
Mixed-path processing method in CDMA system
Technical field
Mixed-path processing method in being updated the present invention relates to wireless communication technology field, more particularly to CDMA (Code Division Multiple Access) (hereinafter referred to as CDMA) wireless communication system multipath.Background technology
CDMA is a kind of multiple access method, it is based on spread spectrum and oneself turns into except existing frequency division multiple access (Frequency Division Multiple Access recently, abbreviation FDMA) and time division multiple acess (Time Division Multiple Access, abbreviation TDMA) method outside be applied to communication system another multi-address method.Compared with the conventional method, CDMA has many advantages, such as the availability of frequency spectrum is high, planning is simple.Mainly had using the system of CDMA methods now：Narrowband CDMA ((the Interim Standard 95 of Interim Standard 95, abbreviation IS-95)) system, wideband CDMA (Wideband CDMA) (hereinafter referred to as WCDMA) system, CDMA2000 systems, TD SDMA (Time Division Synchronous Code Division Multiple Access, abbreviation TD-SCDMA) system and TD-CDMA Time Division-Code Division Multiple Access (Time Division-Code Division Multiple Access, abbreviation TD-CDMA) system etc..
In general mobile communication environment, the signal between base station and mobile station is propagated along some paths between Receiver And Transmitter.This multipath propagation phenomena is mainly caused by the reflection of the body surface as signal around transmitter and receiver.Due to propagation path not
Together, the propagation delay that the same signal of receiver is reached along different paths is also different, so as to cause multi-path jamming and signal fadeout.
The receiver used in a cdma system is a kind of receiver of multiple-branching construction, and each of which branch is synchronous with the footpath that propagation delay is essentially identical.Each branch is a single receiver element, and its function is that demodulation is expected to receive component of signal, merges different receivers element signal, so as to improve received signal quality.This receiver is also Rake (hereinafter referred to as Rake) receiver, and it can be superimposed the energy in the footpath of same user's different delay by certain rule, so as to improve receptivity.Each of which branch is also referred to as finger, or demodulation multipath.
Local spreading code with reception signal spreading code synchronously be proper communication in cdma system premise.If spread and disposal plus can not be obtained, it just can not correctly de-spread, can not correctly solve raw information.Multipath searching is exactly that multipath signal propagations time delay is detected from signal is received, and can be called Path, or search multipath.According to these search multipaths, the spreading code holding that local spreading code is allowed to receiving each multi-path information in signal in adjustment Rake receivers is synchronous.So in a cdma system, the multipath result Path that Rake receivers will go out according to Multipath searching block search updates the finger parameters of Rake receivers.If renewal process is unreasonable, the demodulation performance of Rake receivers will have loss.
In addition, for more timely more accurate spread and disposal plus, industry also generally uses multi-path tracing method, multipath tracking module is by comparing demodulation multi-path location, slightly before demodulation multi-path location and is slightly later than the demodulation energy between demodulation multi-path location to estimate that real multipath should be more early than current demodulated multi-path location or late, and demodulates multi-path location according to estimated result adjustment.Wherein multi-path tracing method is also door tracking sooner or later.
By taking WCDMA systems as an example, the resolution ratio of multipath is about a chip（Hereinafter referred to as
Chip), 78.125 meters are corresponded in the air, that is to say, that in general urban area circumstance, often there is a plurality of closely located multipath.Being defined in third generation partner program (the 3rd Generation Partnership Project, abbreviation 3GPP) in Case3 and Case4 channel circumstance, this channel circumstance has 4 multipaths, and every multipath is separated by lchip.This 4 multipaths mix in Multipath searching module, relatively more difficult to distinguish as the footpath that a comparison is fat.As it is this two or more multipath it is in close proximity, interactional phenomenon is called fat footpath phenomenon in this specification.In actual wireless environment, it is also possible to fat footpath phenomenon occur.If using above-mentioned multi-path tracing method, and each bar finger independence and freedom is slided, then these multipaths are easy to slide together.The result of Multipath searching module is also likely to allow these multipaths to slide together.For Case3 or fat footpath, it is necessary to which using certain method for limiting, without allowing these multipaths to slide into together, this method is properly termed as mixed-path processing method.
Up to the present, the method for many Multipath searchings and multipath tracking is proposed on open source information, wherein there are a few patents to mention mixed-path processing method.For example, in the Chinese patent of Application No. 03116715《One kind is used for the uplink multi-path tracking of WCDMA (WCDMA) system》With the United States Patent (USP) of Publication No. 20010010703《Pattern generating circuit, uses identical multipath tracking circuit and multi-path tracing method》（《 Pattern generation circuit, multi-path detection circuit employing the same and multi-path detection method 》）In refer to a kind of method that use peak interference is removed.In the Chinese patent of Application No. 01816460《Distribution and redistribute that CDMA second refers to》In, it is noted that the method that adjustment time tracks ring speed.In Publication No. 2000-078106 Japan Patent《CDMA signal receivers》（《CDMA SIGNAL RECEIVERS) in, it is proposed that the method that multipath is distinguished using amplitude and phase angle, its calculating is more complicated.
The content of the invention
In view of it is above-mentioned, it is an object of the invention to propose a kind of succinct effective cdma system mixed-path processing method, problem is adjusted to solve multi-path location in close proximity.
The technical problems to be solved by the invention are:Multi-path location adjustment problem when the delay inequality of each bar multipath is smaller during multipath updates in cdma system base station or mobile station.
In order to solve the above technical problems, the technical solution adopted in the present invention is：When two multipaths are in close proximity, if the energy of two multipaths is quite, it can only slide or keep in situ to departing direction；If the energy of wherein one multipath is significantly stronger than an other multipath, strong footpath can slidably, and weak footpath can only be to the direction slip away from strong footpath.It can also increase by a rule on the basis of the above, further to improve performance, i.e., when the weaker multipath of energy is too near to strong footpath, and when also being slided toward strong footpath direction, delete this weak footpath.
To achieve the above object, a kind of cdma system mixed-path processing method of the invention, comprises the following steps：
Step Multipath searching module or multipath tracking module lift multipath Fingerl phase slip request, and note multipath Fingerl phase is Offsetl, and energy is Energyl;Step 2:The immediate multipath of phase with multipath Fingerl is found in glide direction, if finding such multipath Finger2, the energy for recording multipath Finger2 is Energy2 and phase is Offset2, and calculates multipath phase Differential variable：DeltaOffset=abs (Offsetl-Offset2), wherein abs () represent to take absolute value；
If such multipath is can not find, to above-mentioned multipath phase Differential variable assignment：DeltaOffset=INVALID_VALUE, the wherein INVALID_VALUE represent an invalid value, and real multipath phase Differential variable will not get this value；
Step 3:Judge whether above-mentioned multipath phase Differential variable DeltaOffset is not equal to above-mentioned INVALID-VALUE, and whether above-mentioned multipath phase Differential variable DeltaOffset is less than threshold value OffsetTh;If condition is invalid, step 5 is performed;Otherwise step 4 is performed;Step 4:Judge whether K*Energy2<Energyl, wherein K are a coefficients more than 1；If condition is invalid, step 6 is performed;Otherwise step 5 is performed;
Step 5:Above-mentioned multipath Fingerl phase is updated by the request of above-mentioned steps 1, this multipath, which updates, to be terminated；
Step 6:Keep above-mentioned multipath Fingerl phase motionless, this multipath, which updates, to be terminated.Threshold value OffsetTh wherein in above-mentioned steps 3 is no more than lchip.
To achieve the above object, another cdma system mixed-path processing method of the invention, comprises the following steps：
Step 1:Multipath searching module or multipath tracking module lift multipath Fingerl phase slip request, and note multipath Fingerl phase is Offsetl, and energy is Energyl;Step 2:The immediate multipath of phase with multipath Fingerl is found in glide direction, if finding such multipath Finger2, the energy for recording multipath Finger2 is Energy2 and phase is 0ffset2, and calculates multipath phase Differential variable：DeltaOffset=abs (Offsetl -0ffset2), wherein abs () represent to take absolute value；
If such multipath is can not find, to above-mentioned multipath phase Differential variable assignment：DeltaOffset=INVALID-VALUE, the wherein INVALID-VALUE represent an invalid value, and real multipath phase Differential variable will not get this value；
Step 3:Judge whether above-mentioned multipath phase Differential variable DeltaOffset is not equal to INVALID_VALUE, and whether above-mentioned multipath phase Differential variable DeltaOffset is less than
Threshold value OffsetTh;If condition is invalid, step 6 is performed;Otherwise step 4 is performed;Step 4:Judge whether K*Energy2<Energyl, wherein K are a coefficients more than 1；If condition is set up, step 6 is performed;Otherwise step 5 is performed;
Step 5:Judge whether above-mentioned multipath phase Differential variable DeltaOffset is less than thresholding OffsetThDel, and Energy l<Energy2;If condition is set up, step 7 is performed;Otherwise step 8 is performed;
Step 6:Above-mentioned multipath Fingerl phase is updated by the request of step 1, this multipath, which updates, to be terminated；
Step 7:Above-mentioned multipath Fingerl is deleted, this multipath, which updates, to be terminated；
Step 8:Keep above-mentioned multipath Fingerl phase motionless, this multipath, which updates, to be terminated.Threshold value OffsetTh wherein in above-mentioned steps 3 is no more than lchip;And above-mentioned steps
Thresholding OffsetThDel in 5, its value is less than or equal to lchip.
Using method of the present invention, when the multipath for handling relative close updates the multipath relatively stablized can be kept to update, prevent multipath from sliding into one piece and going, to improve demodulation performance.
For above and other objects of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and coordinate Figure of description, it is described in detail below.Brief description of the drawings
Fig. 1 is the flow chart of the method for the invention scheme one.
Fig. 2 is the flow chart of the method for the invention scheme two.
Fig. 3 is the variation diagram that conventional method demodulates multipath phase.
Fig. 4 is the variation diagram of the demodulation multipath phase of the method for the invention scheme two.
Fig. 5 is the distribution map of conventional method demodulation energy.
Fig. 6 is the distribution map of the demodulation energy of the method for the invention scheme two.
Fig. 7 is that conventional method multipath energy changes with time figure.
Fig. 8 changes with time figure for the multipath energy of the method for the invention scheme two.Fig. 9 is that conventional method is compared figure with the demodulation performance of the method for the invention scheme two.Embodiment
Below according to drawings and examples, the present invention is described in further detail.According to these accompanying drawings, person of ordinary skill in the field can be easily carried out the present invention.
When Multipath searching module or multipath tracking module require to update the phase of multipath, and phase changing capacity is when being less than 1 chip, is properly termed as multipath phase slip.Conventional method is directly to update multipath phase according to the request of Multipath searching module or multipath tracking module.And the method for the invention can make 3 kinds of decision-makings according to different situations：Updated by request, do not update or delete this multipath.
Fig. 1 is the flow chart of the method for the invention scheme one.As shown in figure 1, it comprises the following steps：
Handle the first step of the corresponding the method for the invention scheme one of square frame 101, this step is proposed the phase slip request to certain multipath Fingerl by Multipath searching module or multipath tracking module, assuming that the current phase of this multipath is Offsetl, energy is EnerGy2, slides request to allow multipath Fingerl phase Offsetl to be moved rearwards by, i.e. phase Offsetl increases；The second step of the corresponding the method for the invention scheme one of square frame 102 is handled, the purpose of this step is to judge whether there is multipath in multipath Fingerl glide directions, if（It is called multipath
Finger2, its phase is Offset2, and energy is Energy2), calculate phase Offset2 and phase Offsetl gap;Its specific practice can be：The multipath nearest with multipath Fingerl phase is looked in glide direction, multipath phase Differential variable DetlaOffset=abs (Offsetl-Offset2) is calculated if finding, wherein abs () represents to take absolute value；If can not find, multipath phase Differential variable DeltaOffset=INVALID-VALUE is made, INVALID-VALUE here is an invalid value, and real multipath phase difference can not possibly take this value；
3rd step of the corresponding the method for the invention scheme one of decision block 103, it judges whether multipath phase Differential variable DeltaOffset is not equal to INVALID-VALUE, and whether multipath phase Differential variable DeltaOffset is less than threshold value OffsetTh, wherein threshold value OffsetTh here is no more than lchip;The 4th step is performed if this condition is set up；Carried into execution a plan if invalid one the 5th step（Correspondence square frame 105), update multipath Fingerl phase by the requirement of the first step；
4th step of the corresponding the method for the invention scheme one of decision block 104, it judges whether K*Energy2 is less than Energyl, and wherein K is a coefficient not less than 1；If condition set up if carry into execution a plan one the 5th step（Correspondence square frame 105), update multipath Fingerl phase by the requirement of the first step；Carried into execution a plan if condition is invalid one the 6th step (correspondence square frame 106), keep multipath Fingerl phase motionless.
Fig. 2 is the flow chart of the method for the invention scheme two.Wherein processing block 201,202 and decision block 203,204 are identical with the processing block 101,102 and decision block 103,104 in Fig. 1 respectively, are not repeated herein.
5th step of the corresponding the method for the invention scheme two of decision block 205, it judges multipath phase
Whether position Differential variable DeltaOffset is less than thresholding OffsetthDel, and whether Energy 1 is less than Energy2;If condition set up if carry into execution a plan two the 7th step（Correspondence square frame 207), delete multipath Fingerl;Carried into execution a plan if condition is invalid two the 8th step（Correspondence square frame 208), keep multipath Finger phase motionless.The selection that multipath is deleted in increase can make multipath method of adjustment more flexible, can handle the situation that two multipaths are slided on a position.
Fig. 3 is the variation diagram that conventional method demodulates multipath phase, and it is in CaSThe test result of dual-antenna reception in the case of e3.As shown in figure 3, transverse axis is time shaft, its unit is 10ms;The longitudinal axis is the time delay phase Offset of multipath, and its unit is l/8chip.4 horizontal straight lines are respectively 4 true multipaths in the Case3 wireless environments defined in agreement in Fig. 3, the average energy of first true multipath 1 is most strong in Case3, the average energy of Article 2 true multipath 2 is the half of first true multipath 1, the average energy of Article 3 true multipath 3 is the half of Article 2 true multipath 2, the average energy of Article 4 true multipath 4 is the half of Article 3 true multipath 3, the phase invariant of this four multipaths, but there are decline, i.e. energy to change over time.The curve that each bar curve in Fig. 3 changes over time for the phase of the demodulation multipath of each bar true multipath, the phase place change of these demodulation multipaths is by Multipath searching module or the control of multipath tracking module.As can be seen from Figure 3, in addition to average energy most strong true multipath 1 keeps more stably being demodulated, demodulation multipath on other 3 true multipath positions is slided through frequentation true multipath 1, and demodulation multipath can not be maintained in correct true multipath phase.
Fig. 4 is the variation diagram of the demodulation multipath phase of the method for the invention scheme two.Its test condition, figure 4, it is seen that each bar demodulation multipath can be relatively stably maintained on the phase position of 4 true multipaths, not total as shown in Figure 3 with Fig. 3 test condition
It is to be slided toward most powerful path direction.
Fig. 5 is the distribution map of conventional method demodulation energy.The same Fig. 3 of its test condition, as shown in Fig. 5, from demodulation energy distribution, can substantially be seen that there is 3 obvious multipaths, also have some energy between the energy very little of the 4th article of multipath, and each bar multipath.
Fig. 6 is the distribution map of the demodulation energy of the method for the invention scheme two.The same Fig. 5 of its test condition, as shown in fig. 6, from demodulation energy distribution, there is obvious 4 multipaths, and separates clearly, the energy comparison between 4 multipaths unlike Fig. 5 is obscured between 4 multipaths.It is also seen that the method for the invention can effectively collect energy Fig. 7 of multipath is changed with time figure for conventional method multipath energy from this figure.Same Fig. 3 of its test condition, as shown in fig. 7, more difficult from this figure distinguished several multipaths.
Fig. 8 changes with time figure for the multipath energy of the method for the invention scheme two.The same Fig. 7 of its test condition, as shown in figure 8, can clearly be seen that there is 4 multipaths from this figure, this 4 multipath also in the case of exactly Case3.
Fig. 9 is that conventional method is compared figure with the demodulation performance of the method for the invention scheme two.As shown in figure 9, abscissa is the ratio Eb/N0 of signal energy and noise power spectral density, in units of dB, ordinate is block error rate BLER.Under the conditions of identical Eb/NO, block error rate BLER is smaller, and communication quality is better.Under the conditions of identical block error rate BLER, required Eb/NO is the smaller the better.Curve 1 is the demodulation performance curve of conventional method in Fig. 9, and curve 2 is the demodulation performance curve of the method for the invention scheme two.It can be seen that when block error rate BLER is identical, Eb/NO ldBs smaller than conventional method needed for the method for the invention or so, this is considerable performance gain.
In addition, the method for the invention is tested in the wireless environments such as Case4 mobile channels is also significantly better than conventional method.
As seen through the above analysis, according to the method for the invention, it can be very good to handle fat footpath, improve systematic function, and the realization of the method for the invention is simple.
The operation principle of the present invention has been described in detail above, but this is only to facilitate the example for the visualization for understanding and lifting, is not construed as limiting the scope of the present invention.Equally, the description of technique according to the invention scheme and its preferred embodiment, can make various possible equivalent changes or replacement, and all these changes or replacement should all belong to the scope of the claims of the present invention.
Claims (1)
- Claim1st, a kind of mixed-path processing method in CDMA system, it is characterised in that comprise the following steps:Step 1:Multipath searching module or multipath tracking module lift multipath Fingerl phase slip request, and note multipath Fingerl phase is Offsetl, and energy is Energyl;Step 2:The immediate multipath of phase with multipath Fingerl is found in glide direction, if finding such multipath Finger2, the energy for recording multipath Finger2 is Energy2 and phase is Offset2, and calculates multipath phase Differential variable： DeltaOffset = abs(Offsetl -Offset2);If such multipath is can not find, to above-mentioned multipath phase Differential variable assignment：DeltaOffset=INVALID_VALUE, the wherein INVALID-VALUE represent an invalid value；Step 3:Judge whether above-mentioned multipath phase Differential variable DeltaOffset is not equal to above-mentioned INVALID_VALUE, and whether above-mentioned multipath phase Differential variable DeltaOffset is less than threshold value OffsetTh;If condition is invalid, step 5 is performed;Otherwise step 4 is performed;Step 4:Judge whether K*Energy2<Energyl, wherein K are a coefficients more than 1；If condition is invalid, step 6 is performed;Otherwise step 5 is performed;Step 5:Above-mentioned multipath Fingerl phase is updated by the request of above-mentioned steps 1, this multipath, which updates, to be terminated；Step 6:Keep above-mentioned multipath Fingerl phase motionless, this multipath, which updates, to be terminated.2nd, according to the method described in claim 1, it is characterised in that the door in above-mentioned steps 3 Limit value OffsetTh is no more than 1 chip.3rd, a kind of mixed-path processing method in CDMA system, it is characterised in that comprise the following steps-step 1:Multipath searching module or multipath tracking module lift multipath Fingerl phase slip request, and note multipath Fingerl phase is Offsetl, and energy is Energyl;Step 2:The immediate multipath of phase with multipath Fingerl is found in glide direction, if finding such multipath Finger2, the energy for recording multipath Finger2 is Energy2 and phase is Offset2, and calculates multipath phase Differential variable： DeltaOffset= abs(Offsetl -Offset2);If can not find such multipath, to above-mentioned multipath phase Differential variable assignment-DeltaOffset=INVALID-VALUE, the wherein INVALID-VALUE represents an invalid value；Step 3:Judge whether above-mentioned multipath phase Differential variable DeltaOffset is not equal to INVALID-VALUE, and whether above-mentioned multipath phase Differential variable DeltaOffset is less than threshold value OffsetTh;If condition is invalid, step 6 is performed;Otherwise step 4 is performed;Step 4:Judge whether K*Energy2<Energyl, wherein K are a coefficients more than 1；If condition is set up, step 6 is performed;Otherwise step 5 is performed;Step 5:Judge whether above-mentioned multipath phase Differential variable DeltaOffset is less than thresholding OffsetThDel, and Energy Energy 2;If condition is set up, step 7 is performed;Otherwise step 8 is performed;Step 6:Above-mentioned multipath Fingerl phase is updated by the request of step 1, this multipath, which updates, to be terminated；Step 7:Above-mentioned multipath Fingerl is deleted, this multipath, which updates, to be terminated； Step 8:Keep above-mentioned multipath Fingerl phase motionless, this multipath, which updates, to be terminated.4th, method according to claim 3, it is characterised in thatThreshold value OffsetTh in above-mentioned steps 3 is no more than 1 chip；Thresholding OffsetThDd in above-mentioned steps 5, its value is less than or equal to 1 chip.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2005/001667 WO2007041900A1 (en) | 2005-10-11 | 2005-10-11 | A mixed-path processing method in cdma system |
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| CN101167287A true CN101167287A (en) | 2008-04-23 |
| CN101167287B CN101167287B (en) | 2011-05-18 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6269075B1 (en) * | 1998-01-26 | 2001-07-31 | Nokia Mobile Phones Limited | Finger assignment in a CDMA rake receiver |
| CN1118974C (en) * | 2000-07-26 | 2003-08-20 | 深圳市中兴通讯股份有限公司 | Multipath search and distribution method for CDMA system |
| CN1180541C (en) * | 2002-05-20 | 2004-12-15 | 上海贝尔有限公司 | Ruike receiver multipath searching device using energy readjust and multipath searching method |
| CN1269323C (en) * | 2002-12-12 | 2006-08-09 | 华为技术有限公司 | Searcher and its multipath search method |
| CN100438385C (en) * | 2003-06-03 | 2008-11-26 | 华为技术有限公司 | Baseband receiving synchronous acquiring method and apparatus for CDMA system |
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Application publication date: 20080423 Assignee: SHENZHEN ZTE MICROELECTRONICS TECHNOLOGY CO., LTD. Assignor: ZTE Corporation Contract record no.: 2015440020319 Denomination of invention: A mixed-path processing method in CDMA system Granted publication date: 20110518 License type: Common License Record date: 20151123 |
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Granted publication date: 20110518 Termination date: 20181011 |