CN103326742B - Multi-path tracking method and device - Google Patents
Multi-path tracking method and device Download PDFInfo
- Publication number
- CN103326742B CN103326742B CN201210076295.1A CN201210076295A CN103326742B CN 103326742 B CN103326742 B CN 103326742B CN 201210076295 A CN201210076295 A CN 201210076295A CN 103326742 B CN103326742 B CN 103326742B
- Authority
- CN
- China
- Prior art keywords
- multipath
- signal interference
- merging
- interference ratio
- ratio value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The invention discloses a multi-path tracking method and device. The method comprises the steps of searching the positions of multiple paths and expanding a certain number of paths in front of and behind the positions of the multiple paths, acquiring the signal to interference ratio of each expanded path and selecting paths needing to be combined according to the signal to interference ratio of each path, carrying out maximal-ratio combining on the symbol level data of the selected paths needing to be combined, and taking the positions of the selected paths needing to be combined as the multi-path tracking positions. According to the multi-path tracking method and device, the problem that multiple path position searching carried out according to correlation technique is high in error is solved, multiple path position searching accuracy is higher, the block error rate of large transmission blocks is reduced, the peak rate of uplink transmission is increased, and extra gain of multiple path combination is obtained.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of method and device of multipath tracking.
Background technology
In code division multiple access system, Rake (Rake) receiver is widely used.Multipath is Rake receiver
Important component part, it is responsible for search and the distribution of multipath.Rake searcher receiver, to after multipath, enters to the multipath searching
Row descrambling and de-spreading, finally carries out maximum-ratio combing to above-mentioned multipath.Whether the position of the multipath searching accurately determines reception
The performance of machine.With the raising further of message transmission rate, the precision of searcher is put forward higher requirement.Work as transmission block
When very big, the distance that multi-path location only deviates 1/8 chip may cause the Block Error Rate of receiving data to reach 100%.
By the way of matched filtering, typically carry out the search of multi-path location, search precision is in 1/2 chip in correlation technique.
And, because the mobile station that crystal oscillator isochronon problem leads to occurs the movement of true multipath position within the update cycle of searcher
Certainly exist, and the movement of mobile station also results in the shake of multi-path location.And the error due to Multipath searching and
The fast jitter of multi-path location all can cause the deviation of multi-path location, therefore, in actual applications, will to the precision of Multipath searching
Ask comparison high, and the movement of multi-path location being led to due to crystal oscillator isochronon problem and the movement of mobile station lead to multi-path location
Shake is all inevitable, if carrying out the search of multi-path location by the way of the matched filtering in correlation technique, due to search
Precision is not high, and algorithm complex height is not suitable for doing quick multi-path location renewal, thus leading to the deviation of multi-path location.
For the higher problem of the multi-path location error searching in correlation technique, effective solution party is not yet proposed at present
Case.
Content of the invention
For the higher problem of the multi-path location error searching in correlation technique, the invention provides a kind of multipath tracking
Method and device, at least to solve the above problems.
According to an aspect of the invention, it is provided a kind of method of multipath tracking, the method includes：The position of search multipath
Put, extend the multipath of specified quantity before and after the position of the multipath searching；Obtain the signal interference ratio value of every multipath after extension,
According to the signal interference ratio value of every multipath, select the multipath needing to merge；Using select need merge multipath position as
The position of multipath tracking.
Before obtaining the signal interference ratio value of every multipath, said method includes：Descrambling behaviour is carried out to every multipath after extension
Make and de-spreading operation, obtain the sign level data of the control channel of above-mentioned every multipath；Obtain the signal interference ratio value bag of every multipath
Include：The sign level data of the control channel according to above-mentioned every multipath calculates the signal interference ratio value of above-mentioned every multipath.
According to the signal interference ratio value of above-mentioned every multipath, select to need the multipath merging to include：By maximum the setting of signal interference ratio value
The multipath of fixed number amount is as the multipath needing merging；Or, whether the multipath searching before judging to extend is located at adopting of searcher
On sampling point, if it is, using the multipath on above-mentioned sampled point and be located at above-mentioned multipath monosymmetric several to multipath as
Need the multipath merging；If not, using the multipath of the maximum setting quantity of signal interference ratio value as the multipath needing merging.
As after the position of multipath tracking, said method also wraps for the position of the multipath that the above-mentioned needs selected are merged
Include：Maximum-ratio combing is carried out to the sign level data of the multipath needing to merge selected；To the above-mentioned symbol series after merging
According to being demodulated operation and decoded operation, obtain information bit.
During the sign level data of the control channel obtaining above-mentioned every multipath, said method also includes：Obtain above-mentioned every
The sign level data of the data channel of multipath；After obtaining the signal interference ratio value of every multipath, said method also includes：According to above-mentioned
The sign level data of the control channel of every multipath calculates the merging weight of above-mentioned every multipath；The needs selected are merged
The sign level data of multipath carries out maximum-ratio combing and includes：The merging weight of the multipath merging as needed, needs to close to above-mentioned
And the sign level data of the data channel of multipath carry out maximum-ratio combing.
According to a further aspect in the invention, there is provided a kind of device of multipath tracking, this device includes：Expansion module, uses
In the position of search multipath, extend the multipath of specified quantity before and after the position of the multipath searching；Signal interference ratio value acquisition module,
For obtaining the signal interference ratio value of every multipath after above-mentioned expansion module extension；Multipath selecting module, for doing according to above-mentioned letter
The signal interference ratio value of above-mentioned every multipath that ratio acquisition module obtains, selects the multipath needing to merge；Position tracking module, is used for
The position of the multipath that the needs selected are merged is as the position of multipath tracking.
Said apparatus also include：Sign level data acquisition module, for carrying out descrambling operation to every multipath after extension
And de-spreading operation, obtain the sign level data of the control channel of above-mentioned every multipath；Above-mentioned signal interference ratio value acquisition module includes：Letter
Dry ratio calculation unit, the symbol of the control channel of above-mentioned every multipath for being obtained according to above-mentioned sign level data acquisition module
Number DBMS calculates the signal interference ratio value of above-mentioned every multipath.
Above-mentioned multipath selecting module includes：First choice unit, for the multipath of the setting quantity that signal interference ratio value is maximum
As the multipath needing merging；Or, the second select unit, for judging whether the multipath searching before extending is located at searcher
Sampled point on, if it is, by the multipath on above-mentioned sampled point and be located at above-mentioned multipath monosymmetric several to multipath
As the multipath needing merging；If not, using the multipath of the maximum setting quantity of signal interference ratio value as the multipath needing merging.
Said apparatus also include：Maximum-ratio combing module, needs merging for select to above-mentioned multipath selecting module
The sign level data of multipath carry out maximum-ratio combing；Information bit acquisition module, for the above-mentioned symbol series after merging
According to being demodulated operation and decoded operation, obtain information bit.
Above-mentioned sign level data acquisition module, is additionally operable to obtain the sign level data of the data channel of above-mentioned every multipath；
Said apparatus also include：Merge weight computation module, based on the sign level data of the control channel according to above-mentioned every multipath
Count stating the merging weight of every multipath in；Above-mentioned maximum-ratio combing module includes：Maximum-ratio combing unit, for closing as needed
And multipath merging weight, maximum-ratio combing is carried out to the sign level data of data channel of the multipath that above-mentioned needs merge.
Before and after this position, by the present invention, after searching the position of multipath, extend the multipath of specified quantity, then obtain
Take the signal interference ratio value of every multipath after extension, according to the signal interference ratio value of above-mentioned every multipath, select the multipath needing to merge,
Afterwards using the position of the multipath needing to merge selected as the position of multipath tracking, solve search in correlation technique many
The higher problem of path position error, makes the search precision of multi-path location higher, reduces the Block Error Rate of big transmission block, improves up
The peak rate of transmission, obtains the additional gain merging multipath.
Brief description
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this
Bright schematic description and description is used for explaining the present invention, does not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the method flow diagram of multipath tracking according to embodiments of the present invention；
Fig. 2 is multipath extension schematic diagram according to embodiments of the present invention；
Fig. 3 is the flow chart of multipath expansion process according to embodiments of the present invention；
Fig. 4 is multipath extension according to embodiments of the present invention, the flow chart of merging process；
Fig. 5 is the first schematic diagram of multipath expanding policy according to embodiments of the present invention；
Fig. 6 is the second schematic diagram of multipath selection strategy according to embodiments of the present invention；
Fig. 7 is the third schematic diagram of multipath selection strategy according to embodiments of the present invention；
Fig. 8 is the 4th kind of schematic diagram of multipath selection strategy according to embodiments of the present invention；
Fig. 9 is the 5th kind of schematic diagram of multipath selection strategy according to embodiments of the present invention；
Figure 10 is the 6th kind of schematic diagram of multipath selection strategy according to embodiments of the present invention；
Figure 11 is the 7th kind of schematic diagram of multipath selection strategy according to embodiments of the present invention；
Figure 12 is the 8th kind of schematic diagram of multipath selection strategy according to embodiments of the present invention；
Figure 13 is the 9th kind of schematic diagram of multipath selection strategy according to embodiments of the present invention；
Figure 14 is the tenth kind of schematic diagram of multipath selection strategy according to embodiments of the present invention；
Figure 15 is the structured flowchart of multi-path tracking apparatus according to embodiments of the present invention；
Figure 16 is the concrete structure block diagram of multi-path tracking apparatus according to embodiments of the present invention；
Figure 17 is multipath extension according to embodiments of the present invention, merges another kind of structured flowchart of device.
Specific embodiment
To describe the present invention in detail below with reference to accompanying drawing and in conjunction with the embodiments.It should be noted that not conflicting
In the case of, the embodiment in the application and the feature in embodiment can be mutually combined.
In correlation technique, carry out Multipath searching typically by the way of matched filtering, the multipath searching is descrambled
Operation and de-spreading operation, then carry out the maximum-ratio combing of above-mentioned multipath, generally, the multi-path location that aforesaid way determines
The deviation of multi-path location can be caused because of the fast jitter of multi-path location, in order to reduce the deviation of multi-path location to high contrast
System, the performance impact of big transmission block, embodiments provide a kind of method and device of multi-path combing.Below by enforcement
Example is described in detail.
Present embodiments provide a kind of method of multi-path combing, the method above can be realized in equipment (such as receiver),
The method flow diagram of multi-path combing as shown in Figure 1, the method comprises the steps (step S102- step S106)：
Step S102, equipment searches for the position of multipath, and before and after the position of the multipath searching, extension specified quantity is many
Footpath；
Step S104, equipment obtains the signal interference ratio value of every multipath after extension, according to the signal interference ratio of above-mentioned every multipath
Value, selects the multipath needing to merge；
Step S106, the position of the multipath that the above-mentioned needs selected are merged by equipment is as the position of multipath tracking.
Before and after this position, by said method, after searching the position of multipath, extend the multipath of specified quantity, then
Obtain the signal interference ratio value of every multipath after extension, according to the signal interference ratio value of above-mentioned every multipath, select the multipath needing to merge,
The position of the multipath finally merging the above-mentioned needs selected, as the position of multipath tracking, solves search in correlation technique
The higher problem of the multi-path location error that arrives, makes the search precision of multi-path location higher, reduces the Block Error Rate of big transmission block, carry
The peak rate of high uplink, obtains the additional gain merging multipath.
In step s 102, equipment searches for the position of multipath, then extends before and after the position of the multipath searching and specifies
The multipath of quantity, multipath as shown in Figure 2 extends schematic diagram, and the solid line of the centre of Fig. 2 refers to the multi-path location searching, solid line
Several dotted lines on side are the multipaths of extension, and the quantity of extension multipath can be one or more, can be set according to practical situation
Surely extend the quantity of multipath.
After extending the multipath of specified quantity before and after the position of the multipath searching, equipment needs to obtain every multipath
Signal jamming power ratio (Signal to Interference, referred to as SIR, hereinafter simply referred to as signal interference ratio value), signal interference ratio
Value needs to be calculated according to the sign level data of the control channel of every multipath, because the spreading gain of control channel is big, and
And the signal interference ratio value of every multipath is calculated and averagely carried out based on certain time, thus signal interference ratio value is affected by noise less,
The accurate location of base instinct reflection multipath.Therefore, present embodiments provide a kind of preferred embodiment, that is, obtain every multipath
Before signal interference ratio value, first descrambling operation and de-spreading operation are carried out to every multipath after extension, obtain the control of above-mentioned every multipath
The sign level data of channel processed, then, the process obtaining the signal interference ratio value of every multipath in step S104 can include：According to upper
The sign level data stating the control channel of every multipath calculates the signal interference ratio value of above-mentioned every multipath.The acquisition of above-mentioned signal interference ratio value
Mode is simply easily realized, and selects to need the multipath merging to provide basis according to signal interference ratio value for follow-up.
First kind of way is：Equipment is using the multipath of the maximum setting quantity of signal interference ratio value as the multipath needing merging；The
Two kinds of modes are：Whether the multipath that equipment searches before judging to extend is located on the sampled point of searcher, if it is, will be located at
Multipath on this sampled point and be located at this multipath monosymmetric several to multipath as needing the multipaths that merge, such as can be by
1 couple according to the multipath on symmetry merging sampled point and sampled point both sides or two pairs of multipaths, then can also be to remaining many
Footpath carries out selectivity merging according to the size of signal interference ratio value；If it is not, then the multipath of the maximum setting quantity of signal interference ratio value is made
For needing the multipath merging.Such as can first merge two footpaths around sampled point, then to remaining multipath according to signal interference ratio
The size of value carries out selectivity merging.Above two selection mode is fast reasonable, needs the many of merging for follow-up by select
The sign level data in footpath carries out maximum-ratio combing provides basis.Certainly, the selection of the multipath of merging is needed to be not limited only to above-mentioned
Two ways, as long as the suitable multipath needing and merging can be selected.
After selecting the suitable multipath needing and merging, equipment needs to carry out high specific according to the merging weight of multipath
Union operation, therefore, equipment needs to calculate the merging power of every multipath according to the sign level data of the control channel of every multipath
Weight.In the operating process of maximum-ratio combing, equipment is that the sign level data to the data channel needing the multipath merging is carried out
Maximum-ratio combing, therefore, in addition it is also necessary to obtain every multipath during the sign level data of the control channel obtaining every multipath in equipment
Data channel sign level data.So, the acquisition process of above-mentioned data channel is subsequently to carry out maximum-ratio combing to provide
Basis.
In addition it is also necessary to right after equipment carries out maximum-ratio combing to the sign level data of the multipath needing to merge selected
Above-mentioned sign level data after merging is demodulated operation and decoded operation, obtains information bit.Multipath in correlation technique is searched
Mostly rope device is to obtain multi-path location using the pilot frequency sequence auto-correlation of chip-level, so, the basis being provided using the present embodiment
After descrambling and de-spreading, the signal interference ratio of the sign level data of multipath selects the mode of multipath more accurate than based on autocorrelative mode, often
Sign level data after bar multipath descrambling and de-spreading, after maximum-ratio combing, obtains what transmitting terminal sent by hard decision or decoding
Information bit, thus the signal interference ratio value direct reaction of multipath signal quality, aforesaid way reduces the mistake after maximum-ratio combing
Code check.
Fig. 3 is the flow chart of multipath expansion process according to embodiments of the present invention, as shown in figure 3, this process include as follows
Step (step S302- step S316)：
Step S302, the auto-correlation according to pilot frequency sequence carries out Multipath searching.When multipath extension and senior receiver cooperation
When it is necessary to the impact to senior receiver for the false footpath of exclusion extension, senior receiver in addition to merging the energy footpath searching, and also
Noise path can be merged for the Interference Cancellation between multipath.Therefore it is necessary to the impact to noise path for the false footpath after exclusion extension.
Step S304, judges whether multipath extension enables, if it is, representing that interface flag position is 1, execution step
S306, if it is not, then representing that interface flag position is 0, execution step S314.
Step S306, retains the multipath searching and (is referred to as original footpath, that is, original footpath is that multipath searcher searches go out
The multipath coming) position information, this information includes delay, energy, sky wire size and new and old footpath state etc..
Step S308, extends multipath, and every original footpath can extend N bar multipath, and N is configuration item, and such as can configure N is
4, then every original footpath at most can extend four multipaths.
Step S310, the parameter of the multipath after configuration extension, this parameter includes energy, sky wire size etc..
Step S312, closes the search of noise path.
Step S314, carries out the search of noise path, then execution step S316.
Step S316, multipath extension terminates.
Fig. 4 is multipath extension according to embodiments of the present invention, the flow chart of merging process, as shown in figure 4, this process includes
Following steps (step S402- step S416)：
Step S402, does matched filtering to antenna data, i.e. the auto-correlation of pilot frequency sequence.Because pilot frequency sequence is present in often
One time slot, in order to resist noise, can do auto-correlation to the pilot frequency sequence of multiple time slots, find out autocorrelation peak, i.e. multipath
Position.
Step S404, extends the multipath of specified quantity, such as ± 1/4, ± 1/8 before and after the multi-path location searching
Chip position extends four footpaths.
Step S406, is controlled the descrambling and de-spreading of channel, data channel to every multipath, obtains control channel data
The sign level data of channel.
Step S408, is processed to the sign level data of control channel, obtains the signal interference ratio value of every multipath.
Step S410, is processed to the sign level data of control channel, obtains the merging weight of every multipath.
Step S412, according to the signal interference ratio value of every multipath, selects the multipath needing to merge.
Simply select footpath strategy can select the larger multipath of signal interference ratio value, for example, select of signal interference ratio value maximum
Or several multipaths are as the multipath needing merging, or obtain the maximum SIRmax in the signal interference ratio value of all multipaths, set
One threshold value th between 0～1, merges the multipath that all signal interference ratios are more than SIRmax*th.Complicated selects footpath strategy needs
Consider whether true footpath is located on the sampled point of searcher, because searcher has precision, such as 1 chip (chip), that is, search
The sampled point of rope device is spaced apart with 1 chip, then search multipath out is also the extension with 1 chip for interval
Multipath be also to have precision, can be higher than the precision of searcher or equal.And really multipath (i.e. true footpath) position is can
With infinite precision.As shown in figure 5, the true footpath on the left of Fig. 5 is located at the sampled point of searcher, now the signal interference ratio value in true footpath has
Significantly maximum, can select true footpath as the multipath needing merging.True footpath on the right side of Fig. 5 is not at sampled point, now
There is the signal interference ratio value size of two multipaths close near true footpath.Above-mentioned two multipaths can be selected as the multipath needing merging.
Said process can also adopt the expression way of Fig. 6-Figure 10, and in Fig. 6-14, circle represents the multipath that must merge,
Box indicating can participate in the multipath merging if signal interference ratio value exceedes a certain threshold value, and triangular representation nonjoinder is many
Footpath.Specifically select footpath strategy can with combining with theoretical analysis, emulate with measured result and set.Abscissa in Fig. 6-Figure 14 represents
The position of multipath, vertical coordinate represents the signal interference ratio value of each multipath.What Fig. 6-Figure 10 represented is that true footpath is located on sampled point.And
What Figure 11-Figure 14 represented is that true footpath is not on sampled point, and the signal interference ratio value size now having two multipaths near true footpath connects
Closely.Above-mentioned two multipaths can be selected as the multipath needing merging.
Step S414, the merging weight of the multipath merging as needed, the symbol series to the data channel of above-mentioned multipath
According to carrying out maximum-ratio combing.
Step S416, is demodulated to the sign level data after merging and decodes, obtain information bit.
In the present embodiment, due to the macrooperation amount of matched filtering, the renewal of Search Results will not be too fast, Multipath searching with
The update cycle of multipath extension is larger, and the update cycle that signal interference ratio value calculates with multipath selects is less, step S408- step
S412 can be repeated with the less update cycle.
Corresponding to the method for above-mentioned multi-path combing, present embodiments provide a kind of device of multipath tracking, this device is used for
Realize above-described embodiment.Figure 15 is the structured flowchart of multi-path tracking apparatus according to embodiments of the present invention, as shown in figure 15, this dress
Put including：
Expansion module 10, for extending the multipath of specified quantity before and after the position of the multipath searching；
Signal interference ratio value acquisition module 12, connects to expansion module 10, many for obtaining every after expansion module 10 extension
The signal interference ratio value in footpath；
Multipath selecting module 14, connects to signal interference ratio value acquisition module 12, for being obtained according to signal interference ratio value acquisition module 12
The signal interference ratio value of the above-mentioned every multipath taking, selects the multipath needing to merge；
Position tracking module 16, connects to multipath selecting module 14, for the above-mentioned needs selected are merged many
The position in footpath is as the position of multipath tracking.
Before and after this position, by said apparatus, after searching the position of multipath, extend the multipath of specified quantity, then
Obtain the signal interference ratio value of every multipath after extension, according to the signal interference ratio value of above-mentioned every multipath, select the multipath needing to merge,
Finally the above-mentioned needs selected are merged multipath position as the position of multipath tracking, solve in correlation technique and search
The higher problem of multi-path location error that rope arrives, makes the search precision of multi-path location higher, reduces the Block Error Rate of big transmission block,
Improve the peak rate of uplink, obtain the additional gain merging multipath.
After expansion module 10 extends the multipath of specified quantity before and after the position of the multipath searching, signal interference ratio value obtains
Module 12 needs to obtain the SIR (signal jamming power ratio, referred to as signal interference ratio value) of every multipath, and signal interference ratio value needs basis
The sign level data of the control channel of every multipath is calculated, and therefore, present embodiments provides a kind of preferred embodiment, such as schemes
The concrete structure block diagram of the multi-path tracking apparatus shown in 16, this device except include Figure 15 in modules in addition to, described dress
Put and also include：Sign level data acquisition module 18, for carrying out descrambling operation and de-spreading operation to every multipath after extension, obtains
Take the sign level data of the control channel of above-mentioned every multipath, signal interference ratio value acquisition module 12 also includes：Signal interference ratio value calculates single
Unit 122, the sign level data for the control channel of the every multipath being obtained according to sign level data acquisition module 18 calculates often
The signal interference ratio value of bar multipath.
After signal interference ratio value acquisition module 12 gets the signal interference ratio value of every multipath, multipath selecting module 14 needs to select
Select the multipath merging, for the selection mode needing the multipath merging, present embodiments provide a kind of preferred implementation,
I.e. multipath selecting module 14 includes：First choice unit, for using the multipath of setting quantity maximum for signal interference ratio value as needs
The multipath merging；Or, the second select unit, for judging whether the multipath searching before extending is located at the sampled point of searcher
On, if it is, using the multipath on described sampled point and be located at described multipath monosymmetric several to multipath as need
Multipath to be merged；If not, using the multipath of the maximum setting quantity of signal interference ratio value as the multipath needing merging.Certainly, need
The selection of multipath to be merged is not limited only to above two mode, as long as can select the suitable multipath needing to merge being
Can.
After multipath selecting module 14 selects the suitable multipath needing and merging, need the merging weight according to multipath
Carry out maximum-ratio combing operation, therefore, present embodiments provide a kind of preferred implementation, said apparatus also include：Maximum
Ratio merges module 20, and the sign level data of the multipath needing to merge for selecting to multipath selecting module 14 carries out high specific
Merge.Maximum-ratio combing module 20 to select need merge multipath sign level data carry out maximum-ratio combing it
Afterwards in addition it is also necessary to operation and decoded operation are demodulated to the above-mentioned sign level data after merging, obtain information bit.Therefore, on
State device also to include：Information bit acquisition module 22, for being demodulated operating to the sign level data after merging and decoding behaviour
Make, obtain information bit.
Above-mentioned sign level data acquisition module 18 is additionally operable to obtain the sign level data of the data channel of every multipath, according to
The sign level data of the data channel that sign level data acquisition module 18 obtains, said apparatus can merge the meter of weight
Calculate, therefore, said apparatus can also include：Merge weight computation module, for the control channel according to above-mentioned every multipath
Sign level data calculates the merging weight of above-mentioned every multipath.
After merging weight computation module and calculating the merging weight of every multipath, maximum-ratio combing module 16 will be carried out
Maximum-ratio combing operates, and that is, maximum-ratio combing module 20 includes：Maximum-ratio combing unit, for the multipath that merges as needed
Merge weight, maximum-ratio combing is carried out to the sign level data of the data channel of the multipath that above-mentioned needs merge.
Figure 17 is multipath extension according to embodiments of the present invention, merges another kind of structured flowchart of device, as shown in figure 17,
This device is included as lower module：
Multipath searching module, for, after receiving antenna data, carrying out the search of multi-path location.Multipath searching module
Function is equivalent to the function of the position of search multipath of above-mentioned expansion module, and Multipath searching module is based on known chip DBMS
(usually pilot frequency sequence), obtains multi-path location by autocorrelation peak.
Multipath expansion module, for around the multi-path location searching one or several multipath of extension (such as permissible
Five multipaths of extension).The function of multipath expansion module is equivalent in above-described embodiment expansion module in the position of the multipath searching
The function of the multipath of extension specified quantity before and after putting.
Control channel descrambling and de-spreading module, for, after receiving antenna data, carrying out descrambling and de-spreading to each multipath
Process, obtain the sign level data of the control channel of each multipath.On the function of control channel descrambling and de-spreading module is equivalent to
State the function of sign level data acquiring unit in embodiment.
Data channel descrambling and de-spreading module, for, after receiving antenna data, carrying out descrambling and de-spreading to each multipath
Process, obtain the sign level data of the data channel of each multipath.On the function of control channel descrambling and de-spreading module is equivalent to
State the function of data acquisition module in embodiment.
Signal interference ratio computing module, the sign level data for the control channel according to each multipath calculates the letter of this multipath
Dry ratio.The function of signal interference ratio computing module is equivalent to the function of signal interference ratio value computing unit in above-described embodiment.
Merge weight computation module, the sign level data for the control channel according to each multipath calculates this multipath
Merge weight.The function of merging weight computation module is equivalent to the function of merging weight computation module in above-described embodiment.
Multipath selecting module, for the signal interference ratio value based on each multipath, needs to participate according to certain algorithms selection
The multipath of maximum-ratio combing.This module is the core of multi-path combing process.The function of multipath selecting module is equivalent to above-mentioned enforcement
The function of multipath selecting module in example.
Maximum-ratio combing module, for carrying out maximum-ratio combing to the sign level data needing the multipath merging.High specific
The function of merging module is equivalent to the function of maximum-ratio combing module in above-described embodiment.
Demodulation coding module, for being demodulated to the result of maximum-ratio combing decoding, obtains the information bit of transmitting terminal.
The function of demodulation coding module is equivalent to the function of information bit acquisition module in above-described embodiment.Above-mentioned multipath be into
The basis of row multipath extension, the sign level data obtaining after descrambling and de-spreading operation is then to solve for signal interference ratio value and the base merging weight
Plinth.The multipath needing to merge selected, calculated merging weight is then constituted with the descrambling and de-spreading operation of data channel
The input of maximum-ratio combing module, the soft symbol after merging can obtain the information bit of transmitting terminal after entering row decoding.
As can be seen from the above description, the present invention is on the premise of obtaining rough multi-path location using searcher,
Multipath is extended and selects suitable multipath according to the signal interference ratio value of multipath carrying out maximum-ratio combing, thus obtaining more
Accurate multi-path location.And said process than in correlation technique by matched filtering carry out Multipath searching amount of calculation little,
So having the shorter update cycle, can quickly follow the tracks of the change of multi-path location, preventing the performance that multi-path location shake leads to
Decline, improve the peak rate under the low code efficiency of high order modulation (such as 16QAM (16 rank quadrature amplitude modulation)).With
When, so that the number of multipath that arrives of the number great-than search that merges multipath, extra has larger signal interference ratio value to the present invention
Multipath participate in merging extra gain can be provided, such as under AWGN (additive white Gaussian noise) channel, prior art is only
Descrambling and de-spreading is carried out to a multipath, the present invention can merge a plurality of multipath, thus obtaining better performance.
Obviously, those skilled in the art should be understood that each module of the above-mentioned present invention or each step can be with general
Computing device realizing, they can concentrate on single computing device, or be distributed in multiple computing devices and formed
Network on, alternatively, they can be realized with the executable program code of computing device, it is thus possible to they are stored
To be executed by computing device in the storage device, and in some cases, can be with different from shown in order execution herein
The step going out or describing, or they are fabricated to respectively each integrated circuit modules, or by the multiple modules in them or
Step is fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of method of multipath tracking is it is characterised in that include：
The position of search multipath, extends the multipath of specified quantity before and after the position of the multipath searching；
Obtain the signal interference ratio value of every multipath after extension, according to the signal interference ratio value of described every multipath, select to need merging
Multipath；
The position of the multipath that the described needs selected are merged is as the position of multipath tracking.
2. method according to claim 1 it is characterised in that
Before obtaining the signal interference ratio value of every multipath, methods described includes：To extension after every multipath carry out descrambling operation and
De-spreading operation, obtains the sign level data of the control channel of described every multipath；
The signal interference ratio value obtaining every multipath includes：Described in the sign level data of the control channel according to described every multipath calculates
The signal interference ratio value of every multipath.
3. method according to claim 2 is it is characterised in that according to the signal interference ratio value of described every multipath, select to need
The multipath merging includes：
Using the multipath of the maximum setting quantity of signal interference ratio value as the multipath needing merging；Or,
Whether the multipath searching before judging to extend is located on the sampled point of searcher, if it is, will be on described sampled point
Multipath and be located at described multipath monosymmetric several to multipath as need merge multipaths；If not, by signal interference ratio value
The multipath of maximum setting quantity is as the multipath needing merging.
4. method according to claim 2 is it is characterised in that the position of the multipath merging the described needs selected is made
After the position of multipath tracking, methods described also includes：
Maximum-ratio combing is carried out to the sign level data of the multipath needing to merge selected；
Operation and decoded operation are demodulated to the described sign level data after merging, obtain information bit.
5. method according to claim 4 is it is characterised in that obtain the symbol series of the control channel of described every multipath
According to when, methods described also includes：Obtain the sign level data of the data channel of described every multipath；
After obtaining the signal interference ratio value of every multipath, methods described also includes：The symbol of the control channel according to described every multipath
Number DBMS calculates the merging weight of described every multipath；
The sign level data of the multipath needing to merge selected is carried out by maximum-ratio combing includes：The multipath merging as needed
Merging weight, maximum-ratio combing is carried out to the sign level data of data channel of the described multipath needing and merging.
6. a kind of device of multipath tracking is it is characterised in that include：
Expansion module, for searching for the position of multipath, extends the multipath of specified quantity before and after the position of the multipath searching；
Signal interference ratio value acquisition module, for obtaining the signal interference ratio value of every multipath after described expansion module extension；
Multipath selecting module, the signal interference ratio value of the described every multipath for being obtained according to described signal interference ratio value acquisition module, choosing
Select the multipath needing to merge；
Position tracking module, for the position of multipath that the described needs selected are merged as multipath tracking position.
7. device according to claim 6 it is characterised in that
Described device also includes：Sign level data acquisition module, for carrying out descrambling operation reconciliation to every multipath after extension
Expand operation, obtain the sign level data of the control channel of described every multipath；
Described signal interference ratio value acquisition module includes：Signal interference ratio value computing unit, for according to described sign level data acquisition module
The sign level data of the control channel of described every multipath obtaining calculates the signal interference ratio value of described every multipath.
8. device according to claim 7 is it is characterised in that described multipath selecting module includes：
First choice unit, for the multipath merging the multipath of the setting quantity of signal interference ratio value maximum as needs；Or,
Second select unit, for judging whether the multipath searching before extending is located at the sampled point of searcher, if it is, will
Multipath on described sampled point and be located at described multipath monosymmetric several to multipath as needing the multipaths that merge；As
Really no, using the multipath of the maximum setting quantity of signal interference ratio value as the multipath needing merging.
9. device according to claim 7 is it is characterised in that described device also includes：
Maximum-ratio combing module, the sign level data of the multipath needing to merge for selecting to described multipath selecting module is entered
Row maximum-ratio combing；
Information bit acquisition module, for being demodulated operation and decoded operation to the described sign level data after merging, obtains
Information bit.
10. device according to claim 9 it is characterised in that
Described sign level data acquisition module, is additionally operable to obtain the sign level data of the data channel of described every multipath；
Described device also includes：Merge weight computation module, for the symbol series of the control channel according to described every multipath
According to the merging weight calculating described every multipath；
Described maximum-ratio combing module includes：Maximum-ratio combing unit, the merging weight of the multipath for merging as needed is right
The sign level data of the described data channel of multipath needing to merge carries out maximum-ratio combing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210076295.1A CN103326742B (en) | 2012-03-21 | 2012-03-21 | Multi-path tracking method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210076295.1A CN103326742B (en) | 2012-03-21 | 2012-03-21 | Multi-path tracking method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103326742A CN103326742A (en) | 2013-09-25 |
| CN103326742B true CN103326742B (en) | 2017-02-08 |
Family
ID=49195304
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210076295.1A Expired - Fee Related CN103326742B (en) | 2012-03-21 | 2012-03-21 | Multi-path tracking method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103326742B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104765046A (en) * | 2015-04-27 | 2015-07-08 | 成都振芯科技股份有限公司 | Beidou foundation navigation network ground monitoring station receiver and pseudolite multipath inhibition method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1464638A (en) * | 2002-06-11 | 2003-12-31 | 上海贝尔有限公司 | Multipath selection deciding method and apparatus for Rake receiver |
| CN1684373A (en) * | 2004-04-13 | 2005-10-19 | 上海明波通信技术有限公司 | Multipath searching method and its device in mobile communication system |
| US20060050773A1 (en) * | 2004-09-09 | 2006-03-09 | Kabushiki Kaisha Toshiba | Receiving apparatus and method for receiving and processing spread spectrum radio signals |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3973017B2 (en) * | 2002-02-14 | 2007-09-05 | 富士通株式会社 | Radio receiver for estimating interference power |
| US6967989B2 (en) * | 2002-05-17 | 2005-11-22 | Motorola, Inc. | Method and apparatus for time-sharing a rake receiver structure |
| US20040072553A1 (en) * | 2002-09-20 | 2004-04-15 | Xiaohui Wang | Methods, systems, and computer program products for selecting delay positions for a RAKE receiver by adjusting the delay positions based on comparisons of signal to interference ratios and/or powers for multi-path signals over time |
| CN101217289B (en) * | 2007-01-04 | 2011-11-02 | 浙江华立通信集团有限公司 | Multipath receiving and management algorithm of TD-SCDMA/3G/4G terminals |
| CN101022288A (en) * | 2007-04-09 | 2007-08-22 | 互芯集成电路（北京）有限公司 | Dynamic multi-path detecting method and device in code division multiple access communication system |
| CN101277127B (en) * | 2008-03-21 | 2011-10-26 | 华为技术有限公司 | Method for receiving signal as well as receiver, method for combining signal as well as module |
-
2012
- 2012-03-21 CN CN201210076295.1A patent/CN103326742B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1464638A (en) * | 2002-06-11 | 2003-12-31 | 上海贝尔有限公司 | Multipath selection deciding method and apparatus for Rake receiver |
| CN1684373A (en) * | 2004-04-13 | 2005-10-19 | 上海明波通信技术有限公司 | Multipath searching method and its device in mobile communication system |
| US20060050773A1 (en) * | 2004-09-09 | 2006-03-09 | Kabushiki Kaisha Toshiba | Receiving apparatus and method for receiving and processing spread spectrum radio signals |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103326742A (en) | 2013-09-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7151948B2 (en) | Scheme for realizing path selection using optimum path selection threshold in radio communication | |
| CN101601193B (en) | Mmse channel estimation in a communications receiver | |
| CN1301091A (en) | CDMA receiver with enhanced router and method therefor | |
| CN101667848B (en) | Method and device for multi-path searching in CDMA (code-division multiple access) system | |
| US20060182168A1 (en) | Training sequence detection scheme and device of downlink in tdd/cdma system | |
| CN1132357C (en) | Method and device for measuring S/N ratio | |
| CN103326742B (en) | Multi-path tracking method and device | |
| CN101783691B (en) | Frequency deviation estimation method and receiving terminal in time division-synchronization code division multiple access (TD-SCDMA) | |
| CN101072046A (en) | Multi-path selecting method and receiver | |
| US8139692B2 (en) | Code evaluator, code evaluation method, radio communication system, base station and mobile station | |
| CN104126277B (en) | The method of beam selection and base station | |
| US20030142731A1 (en) | Processor and method for weight detection in a closed loop diversity mode WCDMA system | |
| Turin et al. | Modeling wireless channel fading | |
| CN102904605A (en) | Method and device for determining multipath information and rake receiver | |
| US20040127213A1 (en) | Apparatus for recognizing mobile signals in mobile communication system, and method therefor | |
| CN101662310B (en) | Noise path selection method and device thereof | |
| CN101047460B (en) | Counting method and device for transmission delay of physical random access channel | |
| US6496494B1 (en) | Receiver and method with enhanced performance for CDMA transmission | |
| CN1980086B (en) | Method for random accessing message demodulation | |
| CN101198139B (en) | TD-SCDMA terminal and method for implementing co-channel interference subdistrict information real-time detection | |
| CN1937430A (en) | Muti-path detecting method for CDMA communication system | |
| CN100438385C (en) | Baseband receiving synchronous acquiring method and apparatus for CDMA system | |
| CN105827374A (en) | Data decoding method and device | |
| CN114598362B (en) | MIMO mobile communication method, communication system and storage device | |
| CN109347516B (en) | A kind of dynamic self-adapting multipath lookup method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170208 Termination date: 20190321 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |