CN107734515A - A kind of detection method and device of accidental access signal - Google Patents
A kind of detection method and device of accidental access signal Download PDFInfo
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- CN107734515A CN107734515A CN201610649189.6A CN201610649189A CN107734515A CN 107734515 A CN107734515 A CN 107734515A CN 201610649189 A CN201610649189 A CN 201610649189A CN 107734515 A CN107734515 A CN 107734515A
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- H—ELECTRICITY
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Abstract
The invention discloses a kind of detection method and device of accidental access signal, wherein method includes：The accidental access signal that the user terminal received according to each antenna port is sent, it is determined that the coherent detection sequence of each antenna port；The coherent detection subsequence in each detection window is obtained from each antenna port；According to the coherent detection subsequence in preset phase codebook set and each detection window, combined by the optimum angle code book between different antennae port in each detection window of preset rules search；Optimum angle code book according to being searched in each detection window combines, and respectively merges the coherent detection subsequence that each antenna port in each detection window obtains, obtains the peakvalue's checking sequence in each detection window；Correlation peak detection is carried out to the peakvalue's checking sequence in each detection window respectively；According to correlation peak detection result, judge whether each detection window has user terminal access.Present invention reduces the probability to accidental access signal missing inspection and flase drop.
Description
Technical field
The present invention relates to wireless communication technology field, more particularly to a kind of detection method and device of accidental access signal.
Background technology
At present, the variation of communication requirement brings larger challenge to 5G development, and higher transmission rate is (such as maximum
Downlink transmission rate 20Gbps) it is one of developing goal, and bigger transmission bandwidth is one of necessary means, thus it is more idle
High band (maximum more than 100GHz) there is very big attraction, therefore, 5G will be transmitted for high band and is standardized
Set.
High frequency band signal has very big loss, directly influences the transmission range of signal, be because its wavelength is shorter
Solve this problem, generally sample larger beam forming gain to compensate path loss, i.e. base station can pass through larger antenna
Array obtains larger array gain to improve signal quality in this direction in a certain direction.
This patent discussion is on the basis of above scene, and when multiple UE carry out Stochastic accessing, base station carries out the random of multi-user
Access detection process.
For multiple user terminals (User Equipment, UE) random access procedure, in traditional scheme, base station detection
The accidental access signal of multi-user detects the signal in each direction by circulating different beam direction (i.e. array direction),
It can be connect at random using traditional similar Long Term Evolution (Long Term Evolution, LTE) when detecting in each direction
Enter the method for signal detection, but be not so optimal inspection policies, because existing antenna port typically only receives
From the signal of a specific direction, if some UE signal is to reach base station from multiple directions, base station is only detected every time
One direction, repeated detection is needed to above-mentioned UE signal, add the probability to accidental access signal missing inspection and flase drop.
The content of the invention
In view of this, the purpose of the present invention is to propose to a kind of detection method and device of accidental access signal, with reduction pair
Accidental access signal missing inspection and the probability of flase drop, improve the accuracy of detection accidental access signal.
To achieve the above object, the present invention adopts the following technical scheme that：
On the one hand, the embodiments of the invention provide a kind of detection method of accidental access signal, including：
The accidental access signal that the user terminal received according to each antenna port is sent, it is determined that each antenna port
Coherent detection sequence；
The coherent detection subsequence in each detection window is obtained from each antenna port, the coherent detection subsequence belongs to institute
State coherent detection sequence；
According to the coherent detection subsequence in preset phase codebook set and each detection window, each inspection is searched for by preset rules
The optimum angle code book combination between different antennae port in window is surveyed, wherein, the phase code book in the optimum angle code book combination
Belong to the preset phase codebook set, and corresponded with the antenna port；
Optimum angle code book according to being searched in each detection window combines, respectively by each antenna port in each detection window
The coherent detection subsequence of acquisition merges, and obtains the peakvalue's checking sequence in each detection window；
Correlation peak detection is carried out to the peakvalue's checking sequence in each detection window respectively；
According to correlation peak detection result, judge whether each detection window has user terminal access.
On the other hand, the embodiments of the invention provide a kind of detection means of accidental access signal, including：
Coherent detection sequence determining module, what the user terminal for being received according to each antenna port was sent connects at random
Enter signal, it is determined that the coherent detection sequence of each antenna port；
Coherent detection subsequence acquisition module, for obtaining the sub- sequence of coherent detection in each detection window from each antenna port
Row, the coherent detection subsequence belong to the coherent detection sequence；
Optimum angle code book combinatorial search module, for according to the correlation in preset phase codebook set and each detection window
Subsequence is detected, is combined by the optimum angle code book between different antennae port in each detection window of preset rules search, wherein, it is described
Phase code book in the combination of optimum angle code book belongs to the preset phase codebook set, and with a pair of the antenna port 1
Should；
Peakvalue's checking retrieval module, for according to the optimum angle code book combination searched in each detection window, dividing
The coherent detection subsequence that each antenna port in each detection window obtains is not merged, obtains the peak value inspection in each detection window
Sequencing row；
Correlation peak detection module, for carrying out correlation peak detection to the peakvalue's checking sequence in each detection window respectively；
User terminal accesses judge module, for according to correlation peak detection result, judging whether each detection window has user
Terminal accesses.
The beneficial effects of the invention are as follows：The detection method and device of accidental access signal provided by the invention, in base station
After all antenna ports all get coherent detection sequence, the sub- sequence of coherent detection in each detection window is obtained from each antenna port
Row, according to the coherent detection subsequence in preset phase codebook set and each detection window, each detection window is searched for by preset rules
Interior optimum angle code book combination, and preset phase codebook set includes a variety of phase code books, being added on reception antenna to change
Become the directional diagram of reception antenna, strengthen the signal of all directions with this, further according to the different antennae searched in each detection window
Optimum angle code book combination between port, the coherent detection subsequence that each antenna port in each detection window obtains is carried out respectively
Merge, that is, enhance the signal for all directions that user terminal is sent, then correlation peak detection is carried out to the sequence after merging, by
This, can detect the accidental access signal for the user terminal that base station is reached from all directions simultaneously, and due to enhancing all directions
On signal, the probability to accidental access signal missing inspection and flase drop can be reduced, improve detection accidental access signal accuracy.
Meanwhile combined according to optimum angle code book, it may be determined that the direction of user terminal.
Brief description of the drawings
The exemplary embodiment of the present invention will be described in detail by referring to accompanying drawing below, make one of ordinary skill in the art
The above-mentioned and other feature and advantage of the present invention are become apparent from, in accompanying drawing：
Fig. 1 is the schematic flow sheet of the detection method for the accidental access signal that the embodiment of the present invention one provides；
Fig. 2 is the detailed process schematic diagram of step 110 in Fig. 1 that the embodiment of the present invention one provides；
Fig. 3 is the schematic diagram for the coherent detection sequence that the embodiment of the present invention one provides；
Fig. 4 is the detailed process schematic diagram of step 130 in Fig. 1 that the embodiment of the present invention one provides；
Fig. 5 is the detailed process schematic diagram of step 140 in Fig. 1 that the embodiment of the present invention one provides；
Fig. 6 is the structured flowchart of the detection means for the accidental access signal that the embodiment of the present invention two provides.
Embodiment
Further illustrate technical scheme below in conjunction with the accompanying drawings and by embodiment.It is appreciated that
It is that specific embodiment described herein is used only for explaining the present invention, rather than limitation of the invention.Further need exist for illustrating
, for the ease of description, part related to the present invention rather than entire infrastructure are illustrate only in accompanying drawing.
Embodiment one
Fig. 1 is the schematic flow sheet of the detection method for the accidental access signal that the embodiment of the present invention one provides.This method is fitted
Reach the situation for the accidental access signal that a user terminal of base station is sent from multiple directions for detecting, this method can be with
Performed using the detection means or base station of accidental access signal.The device can be configured in base station, can by software and/or
The mode of hardware is realized.As shown in figure 1, this method includes：
The accidental access signal that step 110, the user terminal received according to each antenna port are sent, it is determined that each day
The coherent detection sequence of line end mouth.
When transmitting upstream data, in order to which data transfer distributes resource or obtains uplink synchronous, Stochastic accessing mistake is introduced
Journey.In this process, in order to identify initiate random access request terminal, it is necessary to use accidental access signal.In competitive mode
Under, a ZC sequence of user terminal random selection base station predefined some ZC sequences carries out Stochastic accessing, in order to detect
Which specifically chosen ZC sequence of user terminal is, it is necessary to which the accidental access signal sent to user terminal detects.
In the present embodiment, coherent detection sequence can be the coherent detection sequence of local root sequence, or circulation moves
The coherent detection sequence of bit sequence, but during the coherent detection sequence of use cyclically shifted sequences, operand under the conditions of multi-user
Larger, it is advantageous to the coherent detection sequence of local root sequence.
Specifically, as shown in Fig. 2 this step may include：
Step 111, for each antenna port, obtain accidental access signal in detection window, remove accidental access signal
Cyclic prefix and protection interval.
Step 112, the accidental access signal for removing cyclic prefix and protection interval passed through into FFT, obtained
Frequency domain accidental access signal.
Step 113, frequency domain accidental access signal and local root sequence or cyclically shifted sequences are subjected to conjugate multiplication.
Step 114, the signal for obtaining conjugate multiplication pass through fast fourier inverse transformation, obtain coherent detection sequence.
As shown in figure 3, being the schematic diagram of coherent detection sequence, aforesaid operations are directed to each antenna port, therefore each
Antenna port can obtain different sequences.In Fig. 3, each window that detects may represent a user terminal, and each detect window
Width represent the ZC sequences of a user terminal selecting possible extension space after channel, each width for detecting window can
By base station sets.
Step 120, the coherent detection subsequence out of the acquisition of each antenna port each detection window.
Wherein, coherent detection sequence is belonged to referring to Fig. 3, coherent detection subsequence.
In the present embodiment, the coherent detection subsequence in each detection window can be obtained from antenna port, institute is allowed with this
There is antenna port to obtain the coherent detection subsequence in each detection window；A detection can also be obtained from all antenna ports simultaneously
Coherent detection subsequence in window, each sub- sequence of coherent detection detected in window is obtained from all antenna ports with this one by one simultaneously
Row.
Preferably, the coherent detection subsequence x in i-th of detection window is intercepted from each antenna porti,k(n), after to facilitate
The continuous sequence in same detection window individually detects.Wherein, i=1,2 ... ... NWindow, NWindowTo detect the number of window, k is day
Line end slogan, 0≤n≤NSequence- 1, NSequenceFor the length of coherent detection sequence.
Step 130, according to the coherent detection subsequence in preset phase codebook set and each detection window, by preset rules
Search for the optimum angle code book combination between different antennae port in each detection window.
Wherein, preset phase codebook set contains multiple phase code books, the phase code book in the combination of optimum angle code book
Belong to preset phase codebook set, and corresponded with antenna port.
Based on step 120, as shown in figure 4, this step may include：
Step 131, based on preset phase codebook set, build and the coherent detection subsequence in i-th of detection window carried out
All antenna ports all phase code books combination.
In the present embodiment, the phase between each antenna port can have certain restriction relation, such as DFT antenna codebook shapes
Formula, it is known that the phase of an antenna port, the phase of all antenna ports can be released, thus, accidental access signal can be reduced
Detection time.
Step 132, according to setting search type, travel through the combination of all phase code books, obtain different antennae in i-th of detection window
Optimum angle code book combination between port.
In the present embodiment, setting retrieval type can be：
Wherein, N is the number of antenna port,For the preset phase codebook set, X >=N,
(φ1,φ2,...,φN) combined for optimum angle code book, Q () is to set metric function, φ1,φ2,...,φNRepresent respectively each
Phase code book.
The optimum angle code book combination that step 140, basis search in each detection window, each it will detect respectively each in window
The coherent detection subsequence that antenna port obtains merges, and obtains the peakvalue's checking sequence in each detection window.
Specifically, as shown in figure 5, this step may include：
Step 141, by optimum angle code book combine in phase code book, be weighted to belonging to detection window in phase code book pair
On coherent detection subsequence acquired in the antenna port answered.
It is exemplary, antenna port include first antenna port, the second antenna port ... and N antenna ports, first
Antenna port, the second antenna port ... and the antenna end slogan of N antenna ports is respectively 1,2 ... and N, first antenna
Port, the second antenna port ... and N antenna ports detect the coherent detection subsequence that intercepts in window at the 1st and are respectively
x1,1(n)、x1,2... and x (n)1,N(n) the optimum angle code book, searched in the detection window is combined as (φ1,φ2,...,
φN).Thus, φ is selected1It is weighted to x1,1(n) on, φ is selected2It is weighted to x1,2(n) on ... ..., φ is selectedNIt is weighted to x1,N(n)
On.
Step 142, by it is same detection window in different antennae port weighting after coherent detection subsequence merge, obtain
Peakvalue's checking sequence in the detection window.
Step 150, correlation peak detection is carried out to the peakvalue's checking sequence in each detection window respectively.
Step 160, according to correlation peak detection result, judge whether each detection window has user terminal access.
Exemplary, if detecting, the correlation peak in detection window is not less than detection threshold, judges that the detection window is useful
Family terminal access；If detecting, the correlation peak in detection window is less than detection threshold, judges that the detection window no user terminal connects
Enter.
In addition, the size of preset phase codebook set determines base station scans fineness, but fineness is higher, i.e., default
The more conference of phase codebook set cause search for time delay it is bigger, therefore, in such scheme, preset phase codebook set may include multistage
Preset phase code book collection, wherein, multistage preset phase code book collection can be classified by numerical order, and rear stage phase code book collection
First order phase code book collection is included comprising previous stage phase code book collection, such as second level phase code book collection, thus, according to the second level
When phase code book collection carries out the detection of random access information, using the testing result of first order phase code book collection.Further, it is
Save the searching and detecting time, the search granularity of first order phase code book collection can be set it is larger, by second level phase code book collection
Search granularity sets smaller.
Accordingly, according to the coherent detection subsequence in preset phase codebook set and each detection window, by preset rules
The optimum angle code book combination between different antennae port in each detection window is searched for, including：
By the hierarchal order of multistage preset phase code book collection, window is detected according to preset phase code book collection at different levels and respectively one by one
Interior coherent detection subsequence, combined by the optimum angle code book between different antennae port in each detection window of preset rules search.
Thus, during accidental access signal is detected, first according to first order phase code book collection, in any detection window
The interior detection search for carrying out user terminal, if having detected user terminal access, terminates the search in the detection window；If not yet
User terminal access has been detected, then has been continued to carry out the inspection of user terminal in the detection window according to second level phase code book collection
Search is surveyed, until detecting user terminal access or completing the search of all phase code book collection.This kind of scheme of the present embodiment
The detection speed of detection accidental access signal can in most cases be accelerated.
The detection method for the accidental access signal that the embodiment of the present invention one provides, all antenna ports in base station all obtain
To after coherent detection sequence, the coherent detection subsequence in each detection window is obtained from each antenna port, according to preset phase code
Coherent detection subsequence in this set and each detection window, by the optimum angle code book group in each detection window of preset rules search
Close, and preset phase codebook set includes a variety of phase code books, is added in the directional diagram that can change reception antenna on reception antenna,
Strengthen the signal of all directions with this, further according to the optimum angle code book between the different antennae port searched in each detection window
Combination, the coherent detection subsequence that each antenna port in each detection window obtains is merged respectively, that is, enhances user's end
The signal for all directions sent is held, then correlation peak detection is carried out to the sequence after merging, thus, can be detected simultaneously from all directions
The accidental access signal of a user terminal of base station is reached, and due to enhancing the signal in all directions, can be reduced to random
The probability of signal missing inspection and flase drop is accessed, improves the accuracy of detection accidental access signal.Meanwhile according to optimum angle code book
Combination, it may be determined that the direction of user terminal.
Embodiment two
Fig. 6 is the structured flowchart of the detection means for the accidental access signal that the embodiment of the present invention two provides.As shown in fig. 6,
The device includes coherent detection sequence determining module 10, coherent detection subsequence acquisition module 20, optimum angle code book and combines and search
Rope module 30, peakvalue's checking retrieval module 40, correlation peak detection module 50 and user terminal access judge module 60.
Wherein, coherent detection sequence determining module 10, the user terminal for being received according to each antenna port are sent
Accidental access signal, it is determined that the coherent detection sequence of each antenna port；
Coherent detection subsequence acquisition module 20, for obtaining coherent detection in each detection window from each antenna port
Sequence, coherent detection subsequence belong to coherent detection sequence；
Optimum angle code book combinatorial search module 30, for according to the phase in preset phase codebook set and each detection window
Detection subsequence is closed, is combined by the optimum angle code book between different antennae port in each detection window of preset rules search, wherein, most
Phase code book in excellent phase code book combination belongs to preset phase codebook set, and is corresponded with antenna port；
Peakvalue's checking retrieval module 40, for being combined according to the optimum angle code book searched in each detection window,
The coherent detection subsequence that each antenna port in each detection window obtains is merged respectively, obtains the peak value in each detection window
Detection sequence；
Correlation peak detection module 50, for carrying out correlation peak inspection to the peakvalue's checking sequence in each detection window respectively
Survey；
User terminal accesses judge module 60, for according to correlation peak detection result, judging whether each detection window is useful
Family terminal access.
In the present embodiment, above-mentioned coherent detection sequence determining module 10 may include：
Cyclic prefix and protection interval removal unit, for for each antenna port, obtaining in detection window and connecing at random
Enter signal, remove the cyclic prefix and protection interval of accidental access signal；
Frequency domain accidental access signal acquiring unit, for the accidental access signal for removing cyclic prefix and protection interval to be passed through
FFT is crossed, obtains frequency domain accidental access signal；
Sequence conjugate multiplying unit, for frequency domain accidental access signal and local root sequence or cyclically shifted sequences to be carried out
Conjugate multiplication；
Coherent detection retrieval unit, the signal for conjugate multiplication to be obtained pass through fast fourier inverse transformation, obtained
To coherent detection sequence.
Further, above-mentioned coherent detection subsequence acquisition module 20 may include：
Coherent detection subsequence acquiring unit, for intercepting the coherent detection in i-th of detection window from each antenna port
Subsequence xi,k(n), wherein, i=1,2 ... ... NWindow, NWindowTo detect the number of window, k is antenna end slogan, 0≤n≤NSequence- 1, NSequence
For the length of coherent detection sequence；
Accordingly, above-mentioned optimum angle code book combinatorial search module 30 may include：
Phase code book combines construction unit, for based on preset phase codebook set, building to the phase in i-th of detection window
Close all phase code books combination for all antenna ports that detection subsequence is carried out；
Optimum angle code book combines acquiring unit, for according to setting search type, traveling through all phase code book combinations, obtaining
Optimum angle code book combination in i-th of detection window between different antennae port, set search type as：
Wherein, N is the number of antenna port,For preset phase codebook set, X >=N, (φ1,
φ2,...,φN) combined for optimum angle code book, Q () is setting metric function.
Further, in such scheme, above-mentioned peakvalue's checking retrieval module 40 may include：
Phase code book weighted units, for the phase code book during optimum angle code book is combined, it is weighted to affiliated detection window
On coherent detection subsequence acquired in interior antenna port corresponding with phase code book；
Peakvalue's checking retrieval unit, for the coherent detection after different antennae port weighting in same detection window is sub
Sequence merges, and obtains the peakvalue's checking sequence in the detection window.
Further, above-mentioned user terminal access judge module 60 is specifically used for：
If detecting, the correlation peak in detection window is not less than detection threshold, judges that the detection window has user terminal to connect
Enter；
If detecting, the correlation peak in detection window is less than detection threshold, judges that the detection window no user terminal accesses.
Preferably, in the present embodiment, preset phase codebook set may include multistage preset phase code book collection, the default phase of multistage
This collection of bit code is classified by numerical order, and rear stage phase code book collection includes previous stage phase code book collection；
Accordingly, above-mentioned optimum angle code book combinatorial search module 30 is specifically used for：
By the hierarchal order of multistage preset phase code book collection, window is detected according to preset phase code book collection at different levels and respectively one by one
Interior coherent detection subsequence, combined by the optimum angle code book between different antennae port in each detection window of preset rules search.
The detection means for the accidental access signal that the present embodiment provides, believe with the Stochastic accessing that the embodiment of the present invention is provided
Number detection method belong to same inventive concept, the detection side for the accidental access signal that the executable embodiment of the present invention is provided
Method, possess corresponding function and beneficial effect.Not ins and outs of detailed description in the present embodiment, reference can be made to the present invention is implemented
The detection method for the accidental access signal that example provides.
Pay attention to, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious changes,
Readjust and substitute without departing from protection scope of the present invention.Therefore, although being carried out by above example to the present invention
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
Other more equivalent embodiments can be included, and the scope of the present invention is determined by scope of the appended claims.
Claims (10)
- A kind of 1. detection method of accidental access signal, it is characterised in that including：The accidental access signal that the user terminal received according to each antenna port is sent, it is determined that the correlation of each antenna port Detection sequence；The coherent detection subsequence in each detection window is obtained from each antenna port, the coherent detection subsequence belongs to the phase Close detection sequence；According to the coherent detection subsequence in preset phase codebook set and each detection window, each detection window is searched for by preset rules Optimum angle code book combination between interior different antennae port, wherein, the phase code book in the optimum angle code book combination belongs to The preset phase codebook set, and corresponded with the antenna port；Optimum angle code book according to being searched in each detection window combines, and respectively obtains each antenna port in each detection window Coherent detection subsequence merge, obtain it is each detection window in peakvalue's checking sequence；Correlation peak detection is carried out to the peakvalue's checking sequence in each detection window respectively；According to correlation peak detection result, judge whether each detection window has user terminal access.
- 2. according to the method for claim 1, it is characterised in that obtain the related inspection in each detection window from each antenna port Subsequence is surveyed, including：The coherent detection subsequence x in i-th of detection window is intercepted from each antenna porti,k(n), wherein, i=1,2 ... ... NWindow, NWindowTo detect the number of window, k is antenna end slogan, 0≤n≤NSequence- 1, NSequenceFor the length of coherent detection sequence；According to the coherent detection subsequence in preset phase codebook set and each detection window, each detection window is searched for by preset rules Optimum angle code book combination between interior different antennae port, including：Based on the preset phase codebook set, all days carried out to the coherent detection subsequence in i-th of detection window are built All phase code books combination of line end mouth；According to setting search type, traversal all phase code book combinations, obtain in i-th of detection window between different antennae port Optimum angle code book combine, it is described set search type as：<mrow> <mo>(</mo> <msub> <mi>&phi;</mi> <mn>1</mn> </msub> <mo>,</mo> <msub> <mi>&phi;</mi> <mn>2</mn> </msub> <mo>,</mo> <mo>...</mo> <mo>,</mo> <msub> <mi>&phi;</mi> <mi>N</mi> </msub> <mo>)</mo> <mo>=</mo> <msub> <mi>arg</mi> <mrow> <msub> <mi>&phi;</mi> <mn>1</mn> </msub> <mo>,</mo> <msub> <mi>&phi;</mi> <mn>2</mn> </msub> <mo>,</mo> <mo>...</mo> <mo>,</mo> <msub> <mi>&phi;</mi> <mi>N</mi> </msub> <mo>&Element;</mo> <mi>&Psi;</mi> </mrow> </msub> <mi>max</mi> <mi> </mi> <mi>Q</mi> <mo>(</mo> <munderover> <mo>&Sigma;</mo> <mrow> <mi>k</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>x</mi> <mrow> <mi>i</mi> <mo>,</mo> <mi>k</mi> </mrow> </msub> <mo>(</mo> <mi>n</mi> <mo>)</mo> <msup> <mi>e</mi> <mrow> <msub> <mi>j&phi;</mi> <mi>k</mi> </msub> </mrow> </msup> <mo>)</mo> <mo>,</mo> </mrow>Wherein, N is the number of antenna port,For the preset phase codebook set, X >=N, (φ1, φ2,...,φN) combined for optimum angle code book, Q () is setting metric function.
- 3. according to the method for claim 1, it is characterised in that according to the optimum angle code book searched in each detection window Combination, the coherent detection subsequence that each antenna port in each detection window obtains is merged respectively, obtained in each detection window Peakvalue's checking sequence, including：Phase code book during optimum angle code book is combined, it is weighted to antenna port corresponding with phase code book in affiliated detection window On acquired coherent detection subsequence；Coherent detection subsequence after different antennae port weighting in same detection window is merged, obtained in the detection window Peakvalue's checking sequence.
- 4. according to the method for claim 1, it is characterised in that according to correlation peak detection result, judge that each detection window is No have a user terminal access, including：If detecting, the correlation peak in detection window is not less than detection threshold, judges that the detection window has user terminal access；If detecting, the correlation peak in detection window is less than detection threshold, judges that the detection window no user terminal accesses.
- 5. according to the method for claim 1, it is characterised in that the preset phase codebook set includes multistage preset phase Code book collection, the multistage preset phase code book collection are classified by numerical order, and rear stage phase code book collection includes previous stage Phase code book collection；According to the coherent detection subsequence in preset phase codebook set and each detection window, each detection window is searched for by preset rules Optimum angle code book combination between interior different antennae port, including：By the hierarchal order of the multistage preset phase code book collection, window is detected according to preset phase code book collection at different levels and respectively one by one Interior coherent detection subsequence, combined by the optimum angle code book between different antennae port in each detection window of preset rules search.
- 6. a kind of detection means of accidental access signal, is configured at base station, it is characterised in that including：Coherent detection sequence determining module, the Stochastic accessing letter that the user terminal for being received according to each antenna port is sent Number, it is determined that the coherent detection sequence of each antenna port；Coherent detection subsequence acquisition module, for obtaining the coherent detection subsequence in each detection window from each antenna port, The coherent detection subsequence belongs to the coherent detection sequence；Optimum angle code book combinatorial search module, for according to the coherent detection in preset phase codebook set and each detection window Subsequence, combined by the optimum angle code book between different antennae port in each detection window of preset rules search, wherein, it is described optimal Phase code book in the combination of phase code book belongs to the preset phase codebook set, and is corresponded with the antenna port；Peakvalue's checking retrieval module, for according to the optimum angle code book combination searched in each detection window, respectively will The coherent detection subsequence that each antenna port obtains in each detection window merges, and obtains the peakvalue's checking sequence in each detection window Row；Correlation peak detection module, for carrying out correlation peak detection to the peakvalue's checking sequence in each detection window respectively；User terminal accesses judge module, for according to correlation peak detection result, judging whether each detection window has user terminal Access.
- 7. device according to claim 6, it is characterised in that the coherent detection subsequence acquisition module includes：Coherent detection subsequence acquiring unit, for intercepting the sub- sequence of coherent detection in i-th of detection window from each antenna port Arrange xi,k(n), wherein, i=1,2 ... ... NWindow, NWindowTo detect the number of window, k is antenna end slogan, 0≤n≤NSequence- 1, NSequenceFor phase Close the length of detection sequence；The optimum angle code book combinatorial search module includes：Phase code book combines construction unit, for based on the preset phase codebook set, building to the phase in i-th of detection window Close all phase code books combination for all antenna ports that detection subsequence is carried out；Optimum angle code book combines acquiring unit, for according to setting search type, traversal all phase code book combinations, obtaining Optimum angle code book combination in i-th of detection window between different antennae port, it is described set search type as：<mrow> <mo>(</mo> <msub> <mi>&phi;</mi> <mn>1</mn> </msub> <mo>,</mo> <msub> <mi>&phi;</mi> <mn>2</mn> </msub> <mo>,</mo> <mo>...</mo> <mo>,</mo> <msub> <mi>&phi;</mi> <mi>N</mi> </msub> <mo>)</mo> <mo>=</mo> <msub> <mi>arg</mi> <mrow> <msub> <mi>&phi;</mi> <mn>1</mn> </msub> <mo>,</mo> <msub> <mi>&phi;</mi> <mn>2</mn> </msub> <mo>,</mo> <mo>...</mo> <mo>,</mo> <msub> <mi>&phi;</mi> <mi>N</mi> </msub> <mo>&Element;</mo> <mi>&Psi;</mi> </mrow> </msub> <mi>max</mi> <mi> </mi> <mi>Q</mi> <mo>(</mo> <munderover> <mo>&Sigma;</mo> <mrow> <mi>k</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>x</mi> <mrow> <mi>i</mi> <mo>,</mo> <mi>k</mi> </mrow> </msub> <mo>(</mo> <mi>n</mi> <mo>)</mo> <msup> <mi>e</mi> <mrow> <msub> <mi>j&phi;</mi> <mi>k</mi> </msub> </mrow> </msup> <mo>)</mo> <mo>,</mo> </mrow>Wherein, N is the number of antenna port,For the preset phase codebook set, X >=N, (φ1, φ2,...,φN) combined for optimum angle code book, Q () is setting metric function.
- 8. device according to claim 6, it is characterised in that the peakvalue's checking retrieval module includes：Phase code book weighted units, for by optimum angle code book combine in phase code book, be weighted to belonging to detection window in On coherent detection subsequence corresponding to phase code book acquired in antenna port；Peakvalue's checking retrieval unit, for the coherent detection subsequence after different antennae port in same detection window is weighted Merge, obtain the peakvalue's checking sequence in the detection window.
- 9. device according to claim 6, it is characterised in that the user terminal access judge module is specifically used for：If detecting, the correlation peak in detection window is not less than detection threshold, judges that the detection window has user terminal access；If detecting, the correlation peak in detection window is less than detection threshold, judges that the detection window no user terminal accesses.
- 10. device according to claim 6, it is characterised in that the preset phase codebook set includes multistage default phase This collection of bit code, the multistage preset phase code book collection are classified by numerical order, and rear stage phase code book collection is comprising previous Level phase code book collection；The optimum angle code book combinatorial search module is specifically used for：By the hierarchal order of the multistage preset phase code book collection, window is detected according to preset phase code book collection at different levels and respectively one by one Interior coherent detection subsequence, combined by the optimum angle code book between different antennae port in each detection window of preset rules search.
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