CN106302295A - WMSA searching method based on multiframe in a kind of WCDMA multi-user interference - Google Patents
WMSA searching method based on multiframe in a kind of WCDMA multi-user interference Download PDFInfo
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- CN106302295A CN106302295A CN201610753935.6A CN201610753935A CN106302295A CN 106302295 A CN106302295 A CN 106302295A CN 201610753935 A CN201610753935 A CN 201610753935A CN 106302295 A CN106302295 A CN 106302295A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2662—Arrangements for Wireless System Synchronisation
- H04B7/2668—Arrangements for Wireless Code-Division Multiple Access [CDMA] System Synchronisation
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Abstract
The invention discloses WMSA searching method based on multiframe in a kind of WCDMA multi-user interference, relate to search and the frame synchronization tracking technology thereof of wireless signal in moving communicating field.This method is: the transmitting signal that 1. radio-frequency front-end receptor carries out Base Transmitter signal and target WCDMA terminal thereof by front radio-frequency module is received；2. downstream digital signal processor carries out signal processing to WCDMA base station signal, by the parsing of base station signal obtains scrambler and the synchronous point positional information thereof of the up DCH of target WCDMA terminal；3. ascending pilot frequency energy signal computer carries out processing by the up DCH scrambler that gets and synchronous point positional information thereof and obtains pilot energy, signal to noise ratio and the peak value index value that target terminal is launched；4. energy brush selects device judge reported energy and pick choosing, promotes systematic function further.The present invention have realize simple, real-time is good, resisting multi-user interference substantially, effectively detect the advantage of weak signal.
Description
Technical field
The present invention relates to search and the frame synchronization tracking technology thereof of wireless signal in moving communicating field, particularly relate to life
In a kind of WCDMA (Wideband CDMA Technology) multi-user interference in survey meter, (multi-slot weighting is flat for WMSA based on multiframe
All estimations technique) searching method, there is the advantage that resisting multi-user disturbs, hunting zone is wide, algorithm is simple and is easily achieved.
Background technology
More and more universal along with WCDMA terminal, increasing user carries out radio communication, private network by WCDMA terminal
Radio communication and disaster thereof can be by detecting the WCDMA signal source of targeted customer accurately in searching and rescuing, thus in calamity
Evil is saved the stranded people timely and accurately.Owing to domestic WCDMA network uses 2.1G frequency range in a large number, the decay of signal
Speed relative to other network formats faster, thus affects the investigative range to WCDMA target signal source, especially does multi-user
Disturb in big environment, if target from base station farther out time, use traditional method may search less than the frame synchronization point of weak signal
Position, adds the difficulty that echo signal carries out accurately detecting.
The limitation that traditional way of search synchronizes search to WCDMA signal is very big, in the power of test of weak signal target signal
There is the biggest inferior position, it would be highly desirable to provide the searching method of a kind of improvement to overcome drawbacks described above.
Summary of the invention
Present invention aim at applying in life-detection instrument, overcome existing way of search serious in multi-user interference
In the case of can not to weak signal target support accurately detecting disadvantage, it is provided that based on multiframe in a kind of WCDMA multi-user interference
WMSA searching method, the method complexity is low, hardware resource takies less and the effect of search can be effectively ensured.
The object of the present invention is achieved like this:
Specifically, this method comprises the following steps:
1. radio-frequency front-end receptor carries out sending out of Base Transmitter signal and target WCDMA terminal thereof by front radio-frequency module
Penetrate signal to be received；
2. downstream digital signal processor carries out signal processing to WCDMA base station signal, by the parsing to base station signal
Obtain scrambler and the synchronous point positional information thereof of the up DCH of target WCDMA terminal；
3. ascending pilot frequency energy signal computer is carried out by up DCH scrambler and the synchronous point positional information thereof got
Process and obtain pilot energy, signal to noise ratio and the peak value index value that target terminal is launched；
4. energy brush selects device judge reported energy and pick choosing, promotes systematic function further.
Compared with prior art, the present invention has following advantages and a good effect:
Apply the searching method in the step present invention 3. by the incoherent process of multiframe, frequency difference cumulative mean algorithm, many
Time slot data are carried out frequency deviation elimination, obtain the performance number of echo signal, noise the most easily by the time slot weighted average estimation technique
Than and frame synchronization point position, not only greatly reducing algorithm complex, the taking and search has been effectively ensured of hardware resource
Performance, has had the lifting of 30% than the detection range of traditional method, significantly expands hunting zone, the performance to life-detection instrument
Improve and have good application prospect；
Owing to present invention application is not limited only to life-detection instrument, simultaneously can be to be independent of framing mode and the channel of up-downgoing
Type, can apply in the receiver of each channel of up-downgoing, can also apply in descending adjacent area search simultaneously, this
Bright effect of improving is obvious, improves the detection range of 30% than traditional method, overcome conventional search methods search for completely less than
The predicament of weak signal frame synchronization point, is greatly promoted the investigative range of life-detection instrument；The present invention has that realization is simple, real-time
Good, the resisting multi-user interference advantage detecting weak signal obvious, effective.
Accompanying drawing explanation
Fig. 1 is the block diagram of native system；
Fig. 2 is the software flow pattern of ascending pilot frequency energy signal computer；
Fig. 3 is that the WMSA channel used by the present invention estimates structure chart.
In figure:
00 WCDMA wireless base station；
10 life-detection instrument Software Radio platform,
11 radio-frequency front-end receptors,
12 ascending pilot frequency energy calculator,
13 downstream digital signal processors,
14 energy brushes select device
20 WCDMA target signal source.
English to Chinese
1, WCDMA:Wideband Code Division Multiple Access, Wideband CDMA Technology.
2, WMSA:Weighted Multi-solt Averaging, the weighted multi-slot average estimation technique.
3, DCH:Dedicated channel, dedicated channel.
4, DPCCH:Dedicated Physical Control Channel, Dedicated Physical Control Channel.
5,3GPP:3rd generation partnership project, 3G (Third Generation) Moblie partner program.
Detailed description of the invention
Describe in detail below in conjunction with drawings and Examples.
With reference now to accompanying drawing, describing embodiments of the invention, original paper label similar in accompanying drawing represents similar element.As
Upper described, the invention provides one and apply in life-detection instrument, algorithm complex is low, and hardware resource takies less and can be effective
Ensure the performance of search.
One, system
1, overall
Such as Fig. 1, native system includes WCDMA wireless base station 00 and WCDMA target signal source 20；
It is provided with life-detection instrument Software Radio platform 10；
Life-detection instrument Software Radio platform 10 is respectively with WCDMA wireless base station 00 and WCDMA target signal source 20 even
Logical；
Described life-detection instrument Software Radio platform 10 includes radio-frequency front-end receptor 11, ascending pilot frequency energy signal
Computer 12, downstream digital signal processor 13 and energy brush select device 14；
Radio-frequency front-end receptor 11 and downstream digital signal processor 13 are mutual with ascending pilot frequency energy calculator 12 respectively；
Downstream digital signal processor 13 and radio-frequency front-end receptor 11 are mutual；Energy brush selects device 14 and ascending pilot frequency energy calculator 12
Alternately；
WCDMA wireless base station 00 sends base station down wireless signal to radio-frequency front-end receptor 11；
WCDMA target signal source 20 sends up-link wireless signal to radio-frequency front-end receptor 11.
2, functional part
1) life-detection instrument Software Radio platform 10
Hardware configuration: use hardware frame based on software radio general-purpose platform, selected the software radio of USRP2
Exploitation hardware configuration.
The module embedded includes setting radio-frequency front-end receptor 11, ascending pilot frequency energy signal computer 12, downstream digital letter
Number processor 13 and energy brush select device 14；
* radio-frequency front-end receptor 11: the downstream signal of WCDMA wireless base station 00 is received and right by main realization
The upward signal of WCDMA target signal source 20 is received.
* ascending pilot frequency energy signal computer 12: mainly realize the calculating of target signal source energy in life-detection instrument.
* downstream digital signal processor 13: mainly the downstream wireless signals received from radio-frequency front-end receptor 11 is carried out
Signal processing thus obtain physical layer parameter such as uplink scrambling code and the information of synchronous point position of target WCDMA terminal.
* energy brush selects device 14: mainly the result of calculation to ascending pilot frequency energy signal computer 12 carries out statistics brush choosing, from
And brush and select useful energy signal.
2) WCDMA wireless base station 00
WCDMA wireless base station 00 is general transmitting base station based on international 3GPP standard, and the standard of base station is WCDMA mark
Accurate.
4) WCDMA target signal source 20
WCDMA target signal source 20 is the terminal of WCDMA standard based on international 3GPP standard, needs to detect
Target terminal.
3, the working mechanism of native system:
According to 3GPP agreement, utilizing the communication linkage that target terminal and base station or private network are set up, radio-frequency front-end connects
Receive device 11 to realize the downstream signal of WCDMA wireless base station 00 is received and up letter to WCDMA target signal source 20
Number it is received；Scrambler and the synchronous point thereof of the up DCH of target WCDMA terminal is obtained from the parsing of WCDMA wireless base station 00
Positional information, tentatively obtains uplink scrambling code and the position of uplink synchronous point；Ascending pilot frequency energy signal computer 12 utilizes up
Scrambler and uplink synchronous point, carry out processing pilot energy, signal to noise ratio and the peak value index value obtaining target terminal transmitting.Energy
Brush selects device 14 judge ascending pilot frequency energy signal computer 12 reported energy and pick choosing.
Two, method
Such as Fig. 2, described step 3. in the searching method of ascending pilot frequency energy signal computer be:
A, the position utilizing the descending initial synchronisation point obtaining up DCH and scrambler, determine near uplink synchronous point and search
The window of rope is long, generates the scrambler 201 of this up DCH signal；
B, in search window, take many frame data every time, pilot tone solved by the data taking pilot frequency locations in each time slot
Disturb, de-spread 202；
C, to each frame de-spread after data carry out de-pilot pattern, be i.e. multiplied by correspondence frequency pilot sign get final product 203；
D, frequency pilot sign to each time slot carry out cumulative 204 in units of time slot:
The current time slots data markers of the first frame is that (i, k), the first frame next time slot data are labeled as TS_ to TS_data
data(i,k+1)；The current time slots data markers of the second frame is that (i+1, k), the second frame next time slot data are labeled as TS_data
TS_data(i+1,k+1)；The current time slots data markers of the 3rd frame be TS_data (i+2, k), the 3rd frame next time slot data
It is labeled as TS_data (i+2, k+1), by that analogy.Wherein i is frame number, and k is timeslot number, and 2 are positive integer.
E, each frame is utilized time slot calculate frequency deviation 205, use the method calculate frequency deviation, can effectively reduce channel and decline soon
Fall the impact brought, and the follow-up frequency deviation to each frame is normalized；
F, each frame utilize following formula calculate each time slot the frequency deviation anglec of rotation 206:
In Xiang Guan, considering from frequency deviation, each frame in the ideal situation, is a fixed value；In the correlation, squared and it
After, this value perseverance is 1, i.e. can be initiated with frequency deviation benchmark, i.e. PcgAdjI (i, 1)=1 with each frame；PcgAdjQ (i, 1)=0；Profit
With formula P c g A d i j) (P i calculates c to Q+ to I-(P i c, P c g A d i j), obtains the frequency deviation anglec of rotation of each time slot
Degree, wherein i is frame number, and k is timeslot number, and 2 are positive integer；
G, each frame each time slot recycling WMSA carry out channel estimate 207:
After compared for multiple weight coefficient and method of weighting, find to utilize forward direction time slot signal to filtering noise and resisting many
The ability of user's interference is more effective；Then present invention determine that and utilize 3 weight coefficient (λ0, λ1, λ2) be weighted, use each frame
Below equation carries out channel estimation: WMSAI (i, k)=λ0*(PcgAdjI(i,k))+λ1*(PcgAdjI(i,k-1))+λ2*
(PcgAdjI(i,k-2))；WMSAQ (i, k)=λ0*(PcgAdjQ(i,k))+λ1*(PcgAdjQ(i,k-1))+λ2*(PcgAdjQ
(i,k-2))；Wherein i is frame number, and k is timeslot number, and 2 are positive integer, λ0=1, λ1=0.8, λ2=0.3；WMSA channel is estimated
Meter structure chart is as shown in Figure 3；
The result that H, each time slot of each frame use step 207 channel to estimate removes frequency deviation 208；
I, the time slot result of each frame of step 208 is carried out coherent accumulation, reduce noise and multi-user interference further
209；
J, multiframe carry out noncoherent accumulation 210, when frequency deviation accumulative in preventing frame data is excessive, utilize relevant tired
Add the algorithm deterioration problem caused；
K, acquirement correlation peak and the index value of peak value, index value is the position 211 of frame synchronization point；
L, by all correlations be added divided by correlation length, obtain noise figure, take decibel value and i.e. obtain performance number and noise
Ratio 212:
The signal quality of signal source can be assessed accurately according to performance number size and signal to noise ratio；Multi-user is done by signal to noise ratio
Disturb and the most extremely have reference value, if performance number is big, if signal to noise ratio is the lowest, illustrate that neighbouring other users of existence do
Disturb.
The detection method of the signal source of the present embodiment is be applicable to life-detection instrument, due to the searching method of the present embodiment
Depend on the data of the pilot portion of signal, say, that the method does not relies on signaling channel type, to containing pilot data
Channel equally applicable.It is high that the present invention has real-time, takies hardware resource few, the advantage that algorithm complex is low, and effectively protects
Demonstrate,prove search performance.
Claims (2)
1. WMSA searching method based on multiframe in a WCDMA multi-user interference, it is characterised in that:
1. the transmitting that radio-frequency front-end receptor carries out Base Transmitter signal and target WCDMA terminal thereof by front radio-frequency module is believed
Number it is received；
2. downstream digital signal processor carries out signal processing to WCDMA base station signal, by obtaining the parsing of base station signal
The scrambler of the up DCH of target WCDMA terminal and synchronous point positional information thereof；
3. ascending pilot frequency energy signal computer is processed by up DCH scrambler and the synchronous point positional information thereof got
Obtain pilot energy, signal to noise ratio and peak value index value that target terminal is launched；
4. energy brush selects device judge reported energy and pick choosing, promotes systematic function further.
2. the WMSA searching method as described in claim 1, it is characterised in that described step 3. in ascending pilot frequency energy signal
The searching method of computer is:
A, the position utilizing the descending initial synchronisation point obtaining up DCH and scrambler, choose near the uplink synchronous point just estimated
The window of search is long, generates the scrambler (201) of this up DCH signal；
B, in search window, take many frame data every time, pilot tone descrambled, solve by the data taking pilot frequency locations in each time slot
Expand (202)；
C, each frame is de-spread after number) according to carrying out de-pilot pattern, the frequency pilot sign being i.e. multiplied by correspondence can (203)；
D, frequency pilot sign to each time slot add up (204) in units of time slot:
The current time slots data markers of the first frame be TS_data (i, k), the first frame next time slot data be labeled as TS_data (i,
k+1)；The current time slots data markers of the second frame is that (i+1, k), the second frame next time slot data are labeled as TS_data to TS_data
(i+1,k+1)；The current time slots data markers of the 3rd frame is that (i+2, k), the 3rd frame next time slot data are labeled as TS_data
TS_data (i+2, k+1), by that analogy.Wherein i is frame number, and k is timeslot number, and 2 are positive integer；
E, each frame is utilized time slot calculate frequency deviation (205)；
F, each frame utilize following formula calculate each time slot the frequency deviation anglec of rotation (206):
In Xiang Guan, considering from frequency deviation, each frame in the ideal situation, is a fixed value；It is in the correlation, squared and afterwards,
This value perseverance is 1, i.e. can be initiated with frequency deviation benchmark, i.e. PcgAdjI (i, 1)=1 with each frame；PcgAdjQ (i, 1)=0；Utilize public affairs
Formula P c g A d i j) I-(P i c, P c g A d i j) Q+ (P i is calculated the frequency deviation anglec of rotation of each time slot, its
Middle i is frame number, and k is timeslot number, and 2 are positive integer；
G, each frame each time slot recycling WMSA carries out channel estimation (207):
After compared for multiple weight coefficient and method of weighting, find to utilize forward direction time slot signal to filtering noise and resisting multi-user
The ability of interference is more effective；Then present invention determine that and utilize 3 weight coefficient (λ0, λ1, λ2) be weighted, use below each frame
Formula carries out channel estimation: WMSAI (i, k)=λ0*(PcgAdjI(i,k))+λ1*(PcgAdjI(i,k-1))+λ2*(PcgAdjI
(i,k-2))；WMSAQ (i, k)=λ0*(PcgAdjQ(i,k))+λ1*(PcgAdjQ(i,k-1))+λ2*(PcgAdjQ(i,k-
2))；Wherein i is frame number, and k is timeslot number, and 2 are positive integer, λ0=1, λ1=0.8, λ2=0.3；
The result that H, each time slot of each frame use step 207 channel to estimate removes frequency deviation (208)；
I, the time slot result of each frame of step 208 is carried out coherent accumulation, reduce noise and multi-user interference (209) further；
J, multiframe noncoherent accumulation, when frequency deviation accumulative in preventing frame data is excessive, utilize the algorithm that coherent accumulation causes
Deterioration problem (210)；
K, acquirement correlation peak and the index value of peak value, index value is the position (211) of frame synchronization point；
L, by all correlations be added divided by correlation length, obtain noise figure；Take decibel value and i.e. obtain performance number and snr value
(212)。
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Cited By (4)
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| CN106851815A (en) * | 2017-01-13 | 2017-06-13 | 广州慧睿思通信息科技有限公司 | The uplink synchronisation method when RRC state of UE is DCH states in WCDMA direction-finding systems |
| CN106851704A (en) * | 2017-02-16 | 2017-06-13 | 上海白虹软件科技股份有限公司 | A kind of method that WCDMA system carries out multiple cell trace scheduling |
| CN107819717A (en) * | 2017-11-16 | 2018-03-20 | 武汉虹旭信息技术有限责任公司 | Frequency domain field strength searching method based on PUSCH in a kind of LTE interference |
| CN108288977A (en) * | 2018-01-26 | 2018-07-17 | 重庆邮电大学 | A kind of WCDMA satellite communication systems are the same as frequency strong jamming counteracting and Weak Signal Extraction |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106851815A (en) * | 2017-01-13 | 2017-06-13 | 广州慧睿思通信息科技有限公司 | The uplink synchronisation method when RRC state of UE is DCH states in WCDMA direction-finding systems |
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| CN107819717A (en) * | 2017-11-16 | 2018-03-20 | 武汉虹旭信息技术有限责任公司 | Frequency domain field strength searching method based on PUSCH in a kind of LTE interference |
| CN107819717B (en) * | 2017-11-16 | 2020-06-30 | 武汉虹旭信息技术有限责任公司 | Frequency domain field intensity searching method based on PUSCH in LTE interference |
| CN108288977A (en) * | 2018-01-26 | 2018-07-17 | 重庆邮电大学 | A kind of WCDMA satellite communication systems are the same as frequency strong jamming counteracting and Weak Signal Extraction |
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