CN106302295B - 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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- CN106302295B CN106302295B CN201610753935.6A CN201610753935A CN106302295B CN 106302295 B CN106302295 B CN 106302295B CN 201610753935 A CN201610753935 A CN 201610753935A CN 106302295 B CN106302295 B CN 106302295B
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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
Abstract
The invention discloses the WMSA searching method based on multiframe in a kind of WCDMA multi-user interference, it is related to the search of wireless signal and its frame synchronization tracking technology in mobile communication field.This method is: the front radio-frequency module of radio-frequency front-end receiver carries out Base Transmitter signal and its transmitting signal of target WCDMA terminal is received；Downstream digital signal processor carries out signal processing to WCDMA base station signal, obtains the scrambling code and its synchronous dot position information of the uplink DCH of target WCDMA terminal by the parsing to base station signal；Ascending pilot frequency energy signal calculator passes through the uplink DCH scrambling code got and its synchronous dot position information is handled to obtain pilot energy, signal-to-noise ratio and the peak value index value of target terminal transmitting；Energy brush selects device to be judged reported energy and picked choosing, further lifting system performance.The present invention, which has, realizes that simple, real-time is good, resisting multi-user interference is obvious, the advantage of effectively detection weak signal.
Description
Technical field
The present invention relates to the search of wireless signal in mobile communication field and its frame synchronization tracking technology more particularly to life
(multi-slot weighting is flat by WMSA in one of survey meter WCDMA (Wideband CDMA Technology) multi-user interference based on multiframe
The equal estimation technique) searching method, with the advantage that resisting multi-user interferes, search range is wide, algorithm is simple and is easily achieved.
Background technique
More more and more universal with WCDMA terminal, more and more users are carried out wireless communication with WCDMA terminal, private network
Wireless communication and its disaster can accurately be detected in searching and rescuing by the WCDMA signal source to target user, thus in calamity
The stranded people is timely and accurately saved in evil.Since domestic WCDMA network largely uses 2.1G frequency range, the decaying of signal
Speed faster, to influence the investigative range to WCDMA target signal source, is especially done in multi-user relative to other network formats
Disturb in big environment, if target farther out from base station when, the frame synchronization point less than weak signal may be searched for using conventional method
Position increases the difficulty that accurately detecting is carried out to echo signal.
Traditional way of search is very big to the limitation of the synchronous search of WCDMA signal, in the detectability of weak signal target signal
There is very big disadvantage, it would be highly desirable to provide a kind of improved searching method to overcome drawbacks described above.
Summary of the invention
Present invention aims at applying in life-detection instrument, overcome existing way of search serious in multi-user interference
In the case of cannot support weak signal target the disadvantage of accurately detecting, provide in a kind of WCDMA multi-user interference based on multiframe
WMSA searching method, the method complexity is low, hardware resource occupies less and the effect of search can be effectively ensured.
The object of the present invention is achieved like this:
Specifically, this method includes the following steps:
1. radio-frequency front-end receiver carries out the hair of Base Transmitter signal and its target WCDMA terminal by front radio-frequency module
Signal is penetrated to be received；
2. downstream digital signal processor carries out signal processing to WCDMA base station signal, pass through the parsing to base station signal
Obtain the scrambling code and its synchronous dot position information of the uplink DCH of target WCDMA terminal；
3. ascending pilot frequency energy signal calculator passes through the uplink DCH scrambling code got and its synchronous dot position information carries out
Processing obtains pilot energy, signal-to-noise ratio and the peak value index value of target terminal transmitting；
4. energy brush selects device to be judged reported energy and picked choosing, further lifting system performance.
Compared with prior art, the present invention has following advantages and good effect:
It applies and passes through the incoherent processing of multiframe, frequency difference cumulative mean algorithm, more in step searching method of the invention 3.
Time slot is weighted and averaged the estimation technique, carries out frequency deviation elimination to time slot data, finally easily obtains performance number, the noise of echo signal
Than with frame synchronization point position, not only greatly reduced algorithm complexity, hardware resource occupancy and search has been effectively ensured
Performance expands search range than the promotion that the detection range of conventional method has 30% significantly, to the performance of life-detection instrument
Raising has good application prospect；
Since present invention application is not limited only to life-detection instrument, while the framing mode and channel of uplink and downlink can not depended on
Type can be applied in the receiver of each channel of uplink and downlink, while can also apply in the search of the adjacent area of downlink, this hair
Bright improvement is obvious, than the detection range that conventional method improves 30%, overcome conventional search methods search for completely less than
The predicament of weak signal frame synchronization point, greatly promotes the investigative range of life-detection instrument；The present invention, which has, realizes simple, real-time
Good, resisting multi-user interference obviously, effectively detects the advantage of weak signal.
Detailed description of the invention
Fig. 1 is the structural block diagram of this system；
Fig. 2 is the software flow pattern of ascending pilot frequency energy signal calculator；
Fig. 3 is WMSA channel estimation structure chart used in the present invention.
In figure:
00-the wireless base station WCDMA；
10-life-detection instrument Software Radio platforms,
11-radio-frequency front-end receivers,
12-ascending pilot frequency energy calculators,
13-downstream digital signal processors,
14-energy brushes select device
20-WCDMA target signal sources.
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.
Specific embodiment
It is described in detail below in conjunction with drawings and examples.
The embodiment of the present invention described referring now to the drawings, similar original part label represents similar element in attached drawing.Such as
It is upper described, it is applied in life-detection instrument the present invention provides a kind of, algorithm complexity is low, and hardware resource occupies less and can be effective
Guarantee the performance of search.
One, system
1, overall
Such as Fig. 1, this system includes the wireless base station WCDMA 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 connects with the wireless base station WCDMA 00 and WCDMA target signal source 20 respectively
It is logical；
The life-detection instrument Software Radio platform 10 includes radio-frequency front-end receiver 11, ascending pilot frequency energy signal
Calculator 12, downstream digital signal processor 13 and energy brush select device 14；
Radio-frequency front-end receiver 11 and downstream digital signal processor 13 are interacted with ascending pilot frequency energy calculator 12 respectively；
Downstream digital signal processor 13 and the interaction of radio-frequency front-end receiver 11；Energy brush selects device 14 and ascending pilot frequency energy calculator 12
Interaction；
The wireless base station WCDMA 00 sends base station down wireless signal to radio-frequency front-end receiver 11；
WCDMA target signal source 20 sends up-link wireless signal to radio-frequency front-end receiver 11.
2, functional component
1) life-detection instrument Software Radio platform 10
Hardware configuration: the hardware frame based on software radio general-purpose platform is used, the software radio of USRP2 has been selected
Develop hardware configuration.
The module of insertion includes setting radio-frequency front-end receiver 11, ascending pilot frequency energy signal calculator 12, downstream digital letter
Number processor 13 and energy brush select device 14；
* radio-frequency front-end receiver 11: main realize receive to the downlink signal of the wireless base station WCDMA 00 and right
The uplink signal of WCDMA target signal source 20 is received.
* ascending pilot frequency energy signal calculator 12: the main calculating for realizing target signal source energy in life-detection instrument.
* it downstream digital signal processor 13: is mainly carried out to from the received downstream wireless signals of radio-frequency front-end receiver 11
Signal processing is to obtain the information of the physical layer parameter such as uplink scrambling code and synchronous point position of target WCDMA terminal.
* energy brush selects device 14: statistics brush choosing mainly is carried out to the calculated result of ascending pilot frequency energy signal calculator 12, from
And it brushes and selects useful energy signal.
2) wireless base station WCDMA 00
The wireless base station WCDMA 00 is the general transmitting base station based on international 3GPP standard, and the standard of base station is WCDMA mark
It is quasi-.
4) WCDMA target signal source 20
WCDMA target signal source 20 is the terminal of the WCDMA standard based on international 3GPP standard, is detected
Target terminal.
3, the working mechanism of this system:
According to 3GPP agreement, the communication linkage set up using target terminal and base station or private network, radio-frequency front-end is connect
The realization of device 11 is received the downlink signal of the wireless base station WCDMA 00 receive and believes the uplink of WCDMA target signal source 20
It number is received；The scrambling code and its synchronous point of the uplink DCH of target WCDMA terminal are obtained from the parsing of the wireless base station WCDMA 00
Location information tentatively obtains the position of uplink scrambling code and uplink synchronous point；Ascending pilot frequency energy signal calculator 12 utilizes uplink
Scrambling code and uplink synchronous point are handled to obtain pilot energy, signal-to-noise ratio and the peak value index value of target terminal transmitting.Energy
Brush selects device 14 to be judged and picked choosing to 12 reported energy of ascending pilot frequency energy signal calculator.
Two, method
Such as Fig. 2, the step 3. in the searching method of ascending pilot frequency energy signal calculator be:
A, position and the scrambling code that the initial synchronisation point of uplink DCH is obtained using downlink, determination is searched near uplink synchronous point
The window of rope is long, generates the scrambling code -201 of uplink DCH signal；
B, in search window, multiframe data are taken every time, to taking the data of pilot frequency locations to solve pilot tone in each time slot
It disturbs, de-spread -202；
C, de-pilot pattern is carried out to the data after the despreading of each frame, i.e., it can -203 multiplied by corresponding frequency pilot sign；
D, carry out adding up -204 as unit of time slot to the frequency pilot sign of each time slot:
The current time slots data markers of first frame are TS_data (i, k), and the next time slot data of first frame are labeled as TS_
data(i,k+1)；The current time slots data markers of second frame are TS_data (i+1, k), and the next time slot data of the second frame are labeled as
TS_data(i+1,k+1)；The current time slots data markers of third frame are TS_data (i+2, k), the next time slot data of third frame
Labeled as TS_data (i+2, k+1), and so on.Wherein i is frame number, and k is timeslot number, and 2 be positive integer.
E, frequency deviation -205 is calculated using time slot to each frame, frequency deviation is calculated using the method, channel can be effectively reduced and declined fastly
Bring influence is fallen, the subsequent frequency deviation to each frame is normalized；
F, each frame calculates the frequency deviation rotation angle -206 of each time slot using following formula:
Frequency deviation benchmark, i.e. PcgAdjI (i, 1)=1 are initiated with each frame；PcgAdjQ (i, 1)=0；Utilize formula
PcgAdjI (i, k+1)=PcgAdjI (i, k) * PhaseVecI (i)-PcgAdjQ (i, k) * PhaseVecQ (i)；PcgAdjQ
(i, k+1)=PcgAdjI (i, k) * PhaseVecQ (i)+PcgAdjQ (i, k) * PhaseVecI (i)；Each time slot is calculated
Frequency deviation rotates angle, and wherein i is frame number, and k is timeslot number, and 2 be positive integer；
G, each time slot of each frame recycles WMSA to carry out channel estimation -207:
After it compared a variety of weighting coefficients and method of weighting, discovery using it is preceding to time slot signal to filtering out noise and anti-more
The ability of user's interference is more effective；Then present invention determine that utilizing 3 weighting coefficient (λ0, λ1, λ2) be weighted, using each frame
Following 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 be positive integer, λ0=1, λ1=0.8, λ2=0.3；WMSA channel is estimated
Count structure chart as shown in Figure 3；
H, each time slot of each frame removes frequency deviation -208 using the result of step 207 channel estimation；
I, the time slot result of each frame of step 208 is subjected to coherent accumulation, further decreases noise and multi-user interference-
209；
J, multiframe carries out noncoherent accumulation -210, when the frequency deviation added up in preventing a frame data is excessive, is tired out using relevant
Algorithm deterioration problem caused by adding；
K, the index value of correlation peak and peak value is obtained, index value is the position -211 of frame synchronization point；
L, all correlations are added divided by correlation length to get noise figure, take decibel value up to performance number and noise
Ratio -212:
According to performance number size and signal-to-noise ratio can accurate assessment signal source signal quality；Signal-to-noise ratio is dry to multi-user
Disturbing also extremely has reference value, if performance number is big, if signal-to-noise ratio is always very low, it is dry to illustrate that nearby there are other users
It disturbs.
The detection method of the signal source of the present embodiment is suitable for life-detection instrument, due to the searching method of the present embodiment
The data of pilot portion dependent on signal, that is to say, that this method is independent of signaling channel type, to containing pilot data
Channel it is equally applicable.The present invention has real-time high, and occupancy hardware resource is few, the low advantage of algorithm complexity, and effectively protects
Search performance is demonstrate,proved.
Claims (1)
1. the WMSA searching method in a kind of WCDMA multi-user interference based on multiframe, it is characterised in that:
1. radio-frequency front-end receiver carries out the transmitting letter of Base Transmitter signal and its target WCDMA terminal by front radio-frequency module
Number reception；
2. downstream digital signal processor carries out signal processing to WCDMA base station signal, obtained by the parsing to base station signal
The scrambling code of the uplink DCH of target WCDMA terminal and its synchronous dot position information；
3. ascending pilot frequency energy signal calculator passes through the uplink DCH scrambling code got and its synchronous dot position information is handled
Obtain pilot energy, signal-to-noise ratio and the peak value index value of target terminal transmitting；
4. energy brush selects device to be judged reported energy and picked choosing, further lifting system performance；
The step 3. in the searching method of ascending pilot frequency energy signal calculator be:
A, position and the scrambling code that the initial synchronisation point of uplink DCH is obtained using downlink, are chosen near the uplink synchronous point just estimated
The window of search is long, generates the scrambling code (201) of uplink DCH signal；
B, in search window, multiframe data are taken every time, to taking the data of pilot frequency locations to be descrambled to pilot tone, solved in each time slot
Expand (202)；
C, de-pilot pattern is carried out to the data after the despreading of each frame, i.e., it can (203) multiplied by corresponding frequency pilot sign；
D, (204) are added up as unit of time slot to the frequency pilot sign of each time slot:
The current time slots data markers of first frame be TS_data (i, k), the next time slot data of first frame labeled as TS_data (i,
k+1)；The current time slots data markers of second frame are TS_data (i+1, k), and the next time slot data of the second frame are labeled as TS_data
(i+1,k+1)；The current time slots data markers of third frame are TS_data (i+2, k), and the next time slot data of third frame are labeled as
TS_data (i+2, k+1), and so on；Wherein i is frame number, and k is timeslot number, and 2 be positive integer；
E, frequency deviation (205) are calculated using time slot to each frame；
F, each frame calculates frequency deviation rotation angle (206) of each time slot using following formula:
Frequency deviation benchmark, i.e. PcgAdjI (i, 1)=1 are initiated with each frame；PcgAdjQ (i, 1)=0；Using formula PcgAdjI (i,
K+1)=PcgAdjI (i, k) * PhaseVecI (i)-PcgAdjQ (i, k) * PhaseVecQ (i)；PcgAdjQ (i, k+1)=
PcgAdjI(i,k)*PhaseVecQ(i)+PcgAdjQ(i,k)*PhaseVecI(i)；The frequency deviation rotation of each time slot is calculated
Angle, wherein i is frame number, and k is timeslot number, and 2 be positive integer；
G, each time slot of each frame recycles WMSA to carry out channel estimation (207):
Each frame carries out channel estimation: WMSAI (i, k)=λ using following formula0*(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 be positive integer, λ0=1, λ1=0.8, λ2=0.3；
H, each time slot of each frame removes frequency deviation (208) using the result of step 207 channel estimation；
I, the time slot result of each frame of step 208 is subjected to coherent accumulation, further decreases noise and multi-user interference (209)；
J, multiframe noncoherent accumulation utilizes algorithm caused by coherent accumulation when the frequency deviation added up in preventing a frame data is excessive
Deterioration problem (210)；
K, the index value of correlation peak and peak value is obtained, index value is the position (211) of frame synchronization point；
L, all correlations are added divided by correlation length to get noise figure；Take decibel value up to performance number and snr value
(212)。
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| CN106851815B (en) * | 2017-01-13 | 2019-07-09 | 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 state in WCDMA direction-finding system |
| CN106851704B (en) * | 2017-02-16 | 2021-02-09 | 上海白虹软件科技股份有限公司 | Method for WCDMA system to carry out multi-cell tracking scheduling |
| 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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