CN102790741B - signal detecting method and device - Google Patents
signal detecting method and device Download PDFInfo
- Publication number
- CN102790741B CN102790741B CN201110132745.XA CN201110132745A CN102790741B CN 102790741 B CN102790741 B CN 102790741B CN 201110132745 A CN201110132745 A CN 201110132745A CN 102790741 B CN102790741 B CN 102790741B
- Authority
- CN
- China
- Prior art keywords
- detectable signal
- signal
- domain
- frequency domain
- detection
- 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
- 238000000034 method Methods 0.000 title claims abstract description 68
- 238000001514 detection method Methods 0.000 claims abstract description 200
- 238000012937 correction Methods 0.000 claims abstract description 56
- 230000008569 process Effects 0.000 claims abstract description 24
- 238000006243 chemical reaction Methods 0.000 claims description 44
- 108010076504 Protein Sorting Signals Proteins 0.000 claims description 30
- 230000002596 correlated effect Effects 0.000 claims description 20
- 238000006073 displacement reaction Methods 0.000 claims description 19
- 238000005070 sampling Methods 0.000 claims description 14
- 125000004122 cyclic group Chemical group 0.000 claims description 7
- 238000000605 extraction Methods 0.000 claims description 7
- 238000007689 inspection Methods 0.000 claims description 5
- 230000009466 transformation Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 description 8
- 238000004891 communication Methods 0.000 description 5
- 230000000875 corresponding effect Effects 0.000 description 5
- ODKSFYDXXFIFQN-UHFFFAOYSA-M argininate Chemical compound [O-]C(=O)C(N)CCCNC(N)=N ODKSFYDXXFIFQN-UHFFFAOYSA-M 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000001427 coherent effect Effects 0.000 description 2
- 238000003032 molecular docking Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 241000638935 Senecio crassissimus Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000012549 training Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- 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
- H04L27/2657—Carrier synchronisation
-
- 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
- H04L27/2662—Symbol synchronisation
- H04L27/2663—Coarse synchronisation, e.g. by correlation
-
- 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
- H04L27/2668—Details of algorithms
- H04L27/2673—Details of algorithms characterised by synchronisation parameters
- H04L27/2675—Pilot or known symbols
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
The invention discloses a kind of signal detecting method and device, wherein, signal detecting method includes: use the local frequency domain sequence of target terminal detectable signal, and the frequency domain detectable signal received carries out tim e-domain detection process, obtains correction time domain detectable signal；Use local frequency domain sequence, correction time domain detectable signal is carried out frequency domain detection process, obtain correction frequency domain detectable signal；Correction frequency domain detectable signal is carried out peakvalue's checking.By the present invention, during solving the detection of existing detectable signal, it is impossible to the problem that detectable signal detection degree of accuracy is effectively ensured, reach to improve the effect of detectable signal detection degree of accuracy.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of OFDM (Orthogonal Frequency Division
Multiplexing, OFDM) signal detecting method of detectable signal and device in wireless communication system.
Background technology
OFDM is a kind of Multicarrier Transmission Technology, and this technology utilizes the Frequency orthogonality of each intercarrier, it is achieved multicarrier same
Time transmission, there is availability of frequency spectrum ability high, anti-fading strong, it is achieved the advantage such as simple.Therefore, nothing it is widely used at present
In line communication system.
In a wireless communication environment, owing to there is multipath and Doppler effect, the information that can affect OFDM wireless communication system passes
Transmission quality.In order to ensure information transmission quality, receiver needs to estimate radio channel status information, and then uses estimation
Radio channel status information docking collect mail and number compensate, thus ensure the correctness of transmission information.
At present, the transmitter of ofdm system uses emission detection signal (detection reference signal) or launches the side of pilot signal
Formula, provides the carrier of channel estimation for receiver.Receiver is by detectable signal (detection reference signal) or pilot signal
Detect, determine the source of signal, and then carry out corresponding channel estimation and channel equalization for different user profile.
As a example by Wimax system, each terminal can launch different detectable signals, base station on identical running time-frequency resource simultaneously
Need the detectable signal simultaneously received to be detected, to distinguish different user.Then, the letter for different user is estimated
Channel state information.
When detectable signal is detected, in tim e-domain detection or frequency domain detection, generally select one detection detectable signal.Right
For the method for frequency domain detection detectable signal, it has the advantage that precision is higher, but simultaneously, its testing conditions requires harshness,
Easily missing inspection echo signal, complexity is higher.And for the method for tim e-domain detection detectable signal, although its testing conditions requirement
The highest, but easily affected by wireless channel, thus flase drop situation easily occurs.Visible, no matter it is to use frequency domain detection or time domain
Detection, all cannot ensure the degree of accuracy that detectable signal detects.
Summary of the invention
A kind of signal detecting method of offer and device are provided, detected at least solving above-mentioned detectable signal
Cheng Zhong, it is impossible to the problem that detectable signal detection degree of accuracy is effectively ensured.
According to an aspect of the invention, it is provided a kind of signal detecting method, including: use the basis of target terminal detectable signal
Ground frequency domain sequence, carries out tim e-domain detection process to the frequency domain detectable signal received, and obtains correction time domain detectable signal；Use this
Ground frequency domain sequence, carries out frequency domain detection process to correction time domain detectable signal, obtains correction frequency domain detectable signal；To correction frequency domain
Detectable signal carries out peakvalue's checking.
Preferably, use the local frequency domain sequence of target terminal detectable signal, the frequency domain detectable signal received is carried out time domain inspection
Survey processes, and the step obtaining correction time domain detectable signal includes: use local frequency domain sequence, to the frequency domain detectable signal received
Carry out seeking related operation, obtain the first correlated series value；First correlated series value is carried out inverse fourier transform, when obtaining conversion
Territory detectable signal；According to the peak of conversion time-domain detection signal, the time-domain detection signal received is carried out time domain displacement,
Obtain correction time domain detectable signal.
Preferably, at the peak according to conversion time-domain detection signal, the time-domain detection signal received is carried out time domain displacement
Step before, also include: set detection window in detection conversion time-domain detection signal peak value, it is judged that whether peak value meets
Predetermined condition；If meeting, it is determined that the time-domain detection signal received is the detectable signal that target terminal is launched；If being unsatisfactory for,
Then perform the peak according to conversion time-domain detection signal, the time-domain detection signal received is carried out the step of time domain displacement.
Preferably, when detectable signal sequence is for circulation cyclic mode, a length of N/P of detection window, wherein, N represents Fourier
Leaf transformation is counted, and P represents the instruction parameter of current detectable signal type；When detectable signal sequence is for extraction decimation mode,
The a length of M/D of detection window, wherein, M represents the length of detectable signal sequence, and D represents the instruction of current detectable signal type
Parameter.
Preferably, it is judged that whether peak value meets the step of predetermined condition includes: judge that peak value, whether more than in detection window, converts
N times of the average of time-domain detection signal sampling point amplitude, wherein N is the integer more than 1.
Preferably, use local frequency domain sequence, correction time domain detectable signal is carried out frequency domain detection process, obtain correction frequency domain and visit
The step surveying signal includes: correction time domain detectable signal is carried out Fourier transform, obtains conversion frequency domain detectable signal；Use this
Ground frequency domain sequence, carries out slip related operation to conversion frequency domain detectable signal, obtains the second correlated series value, as correction frequency domain
Detectable signal.
According to a further aspect in the invention, it is provided that a kind of signal supervisory instrument, including: tim e-domain detection module, it is used for using mesh
The local frequency domain sequence of mark end-probing signal, carries out tim e-domain detection process to the frequency domain detectable signal received, and obtains timing
Territory detectable signal；Frequency domain detection module, is used for using local frequency domain sequence, carries out correction time domain detectable signal at frequency domain detection
Reason, obtains correction frequency domain detectable signal；Peak detection block, for carrying out peakvalue's checking to correction frequency domain detectable signal.
Preferably, tim e-domain detection module includes: the first acquisition module, is used for using local frequency domain sequence, to the frequency domain received
Detectable signal carries out seeking related operation, obtains the first correlated series value；Second acquisition module, for entering the first correlated series value
Row inverse fourier transform, obtains conversion time-domain detection signal；3rd acquisition module, for the peak according to conversion time-domain detection signal
Value position, carries out time domain displacement to the time-domain detection signal received, and obtains correction time domain detectable signal.
Preferably, tim e-domain detection module also includes: judge module, for detection conversion time-domain detection letter in the detection window set
Number peak value, it is judged that whether peak value meets predetermined condition；If meeting, it is determined that the time-domain detection signal received is target terminal
The detectable signal launched；If being unsatisfactory for, then enter the 3rd acquisition module.
Preferably, when detectable signal sequence is for circulation cyclic mode, a length of N/P of detection window, wherein, N represents Fourier
Leaf transformation is counted, and P represents the instruction parameter of current detectable signal type；When detectable signal sequence is for extraction decimation mode,
The a length of M/D of detection window, wherein, M represents the length of detectable signal sequence, and D represents the instruction of current detectable signal type
Parameter.
Preferably, frequency domain detection module includes: the 4th acquisition module, for correction time domain detectable signal is carried out Fourier transform,
Obtain conversion frequency domain detectable signal；5th acquisition module, is used for using local frequency domain sequence, carries out conversion frequency domain detectable signal
Slip related operation, obtains the second correlated series value, as correction frequency domain detectable signal.
By the present invention, use the method carrying out twice detectable signal detection the most respectively, wherein, signal detection for the first time
Use tim e-domain detection, effectively distinguish with the detectable signal to targeted customer, and this signal is carried out the reduction of necessity, second
Secondary detection uses frequency domain detection, and the signal after first time detection processes is carried out frequency domain detection again, to determine that this signal is
Echo signal, thus during solving the detection of existing detectable signal, it is impossible to the problem that detectable signal detection degree of accuracy is effectively ensured,
And then reached to improve the effect of detectable signal detection degree of accuracy.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, and the present invention shows
Meaning property embodiment and explanation thereof are used for explaining the present invention, are not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart of steps of a kind of signal detecting method of according to embodiments of the present invention；
Fig. 2 is the flow chart of steps of a kind of signal detecting method of according to embodiments of the present invention two；
Fig. 3 is the flow chart of steps of a kind of signal detecting method of according to embodiments of the present invention three；
Fig. 4 is the flow chart of steps of a kind of signal detecting method of according to embodiments of the present invention four；
Fig. 5 is the flow chart of steps of a kind of signal detecting method of according to embodiments of the present invention five；
Fig. 6 is the structured flowchart of a kind of signal supervisory instrument according to embodiments of the present invention.
Detailed description of the invention
Below with reference to accompanying drawing and describe the present invention in detail in conjunction with the embodiments.It should be noted that in the case of not conflicting,
Embodiment in the application and the feature in embodiment can be mutually combined.
Embodiment one
With reference to Fig. 1, it is shown that the flow chart of steps of a kind of signal detecting method of according to embodiments of the present invention.
The signal detecting method of the present embodiment comprises the following steps:
Step S102: use the local frequency domain sequence of target terminal detectable signal, the frequency domain detectable signal received is carried out time domain
Detection processes, and obtains correction time domain detectable signal；
Before carrying out detectable signal such as Sounding signal detection, Mr. is needed to become local detectable signal sequence.Then, using should
Sequence, as used the conjugate sequence of this sequence, carries out tim e-domain detection to the frequency domain detectable signal received, including carrying out asking relevant
Computing, inverse fourier transform, it is also possible to carry out time domain displacement etc. the most further and process, to obtain correction time-domain detection letter
Number.
Step S104: use local frequency domain sequence, carries out frequency domain detection process to correction time domain detectable signal, obtains correction frequency domain
Detectable signal；
After obtaining correction time domain detectable signal, it is continuing with the local frequency domain sequence of target terminal detectable signal, to timing
Territory detectable signal carries out frequency domain detection, including carrying out Fourier transform and seeking related operation etc., to obtain correction frequency domain detectable signal.
Step S106: correction frequency domain detectable signal is carried out peakvalue's checking.
By correction frequency domain detectable signal is carried out peakvalue's checking, detectable signal can be carried out detection and judge, be received to determine
Detectable signal be whether that target terminal is launched, and then carry out respective handling according to judged result, as carried out letter according to detectable signal
Channel state information is estimated, or requires that terminal carries out repeating transmission etc..
In correlation technique, when carrying out detectable signal detection, because using tim e-domain detection or frequency domain detection to have respective drawback,
Missing inspection or the flase drop of detectable signal can be caused, thus the degree of accuracy that detectable signal detects cannot be ensured.By the present embodiment, adopt
By the method that detectable signal carries out twice detection respectively, wherein, signal detection uses tim e-domain detection for the first time, to use target
The detectable signal at family is effectively distinguished, and this signal carries out the reduction of necessity, and second time detection uses frequency domain detection, to warp
Cross the signal after for the first time detection processes and again carry out frequency domain detection, to determine that this signal, as echo signal, thus solves existing
During detectable signal detection, it is impossible to the problem that detectable signal detection degree of accuracy is effectively ensured, and then reach raising detectable signal
The effect of detection degree of accuracy.
Embodiment two
With reference to Fig. 2, it is shown that the flow chart of steps of a kind of signal detecting method of two according to embodiments of the present invention.
The signal detecting method based on twice detectable signal detection of the present embodiment comprises the following steps:
Step S202: according to the parameter of target detection signal, generates local detectable signal sequence.
In this step, the method for defined in existing 802.16e agreement can be used, the detectable signal used according to target terminal
Producing method and type, generate the frequency domain signal X of the detectable signal of target terminal, i.e. local detectable signal sequence X.
Step S204: the detectable signal received is carried out time domain coherent signal detection and processes.
This step specifically may include that
Step S2042: utilize the conjugated signal of the frequency domain signal X of the target terminal detectable signal that step S202 produces, with reception
Frequency domain detectable signal Y carry out seeking related operation, it is thus achieved that the first correlated series value is designated as H；Then, H is carried out IFFT (Fu
Vertical leaf inverse transformation), it is thus achieved that time-domain signal (i.e. conversion time-domain detection signal), this time-domain signal after the IFFT conversion of note H is h.
Step S2044: in detection window, the peak value of detection h signal.
Step S2046: judge whether this peak value meets predetermined condition, if meeting, then enters step S208；If being unsatisfactory for, then
Enter step S2048.
It should be noted that this step is optional step.The present embodiment can enter and perform step after performing step S2044
Rapid S2048.As the preferred version of the present embodiment, after detecting the peak value of h signal in detection window, it can be determined that whether this peak value
Meet predetermined condition, if this peak value meets predetermined condition, then enter step S208 and directly judge that the signal received is echo signal；
Otherwise, occurring that position docking is received time-domain signal y and carried out corresponding time domain displacement according to peak value, the signal y after displacement is designated as y ' (i.e.
Correction time domain detectable signal).
Step S2048: occur that position carries out corresponding time domain displacement, the signal after displacement to the time-domain signal y received according to peak value
Y is designated as y ' (i.e. correction time domain detectable signal), enters step S206.
Step S206: the detectable signal after the time domain displacement of step S204 output is carried out frequency domain coherent signal detection and processes.
In this step, the sequential value y ' of the output of step S204 is done FFT (fast Flourier) conversion, obtains frequency-region signal (i.e.
Conversion frequency domain detectable signal), it is designated as Y ', to being total to of the frequency domain signal X of the target terminal detectable signal that Y ' produces with step S202
Conjugate signal carries out slip related operation, it is thus achieved that the second correlated series value (i.e. correction frequency domain detectable signal), is designated as H ', at detection window
In H ' is carried out peakvalue's checking.
Step S208: output signal is judged.
In this step, respectively to time domain output h or frequency domain output H ', carry out signal detection judgement, it is determined that the detectable signal of reception
Whether it is that target terminal is launched, end signal detection process.
Problem present in the present embodiment detectable signal detection method for existing ofdm system, as higher in computation complexity,
Accuracy of detection require harshness, easy missing inspection or flase drop and be unfavorable for the most correct being detected and used of signal, it is provided that one is being
The method carrying out twice detectable signal detection in system respectively, disclosure satisfy that, by twice detection, the discrimination precision that detectable signal detects,
Correctness requirement and complexity requirement that detectable signal is detected by system are taken into account.Wherein, signal detection is tim e-domain detection for the first time,
Purpose is to discriminate between the detectable signal of target terminal, and this detectable signal carries out the reduction of necessity；Second time is detected as frequency domain detection,
In the case of system operations amount is supported, the detectable signal after first time detection processes is carried out frequency domain correlation computations again,
To determine this detectable signal detectable signal as target terminal.
It should be noted that embodiments multiple for the present invention ask related operation and slip related operation, can be by this area
Technical staff completes with reference to ask related operation and the slip related operation in existing frequency domain equalization or time domain equalization, does not repeats them here.
Embodiment three
With reference to Fig. 3, it is shown that the flow chart of steps of a kind of signal detecting method of three according to embodiments of the present invention.
In the present embodiment, with terminal in current Wimax system by emission detection signal such as Sounding signal sequence, to base station
As a example by the status information (CSI) of feedback wireless channel.Sounding signal sequence is the regular of a kind of 802.16e agreement regulation
Detectable signal, Sounding signal sequence is divided into cyclic (circulation) mode and decimation (extraction) mode, two classes Sounding
The mode that signal sequence produces clearly is given by 802.16e agreement.
In 802.16e agreement, SS (Subscriber Station, terminal use) is according to IE (the information element of former frame
Information element) information launch UL Sounding (uplink sounding) signal, BS (base station) side according to known transmitting information with
And the feature of Sounding signal sequence, first it is detected that the Sounding signal sequence that target terminal is launched, then can make
Estimate to obtain the uplink channel status information of each useful subcarrier on 1 OFDMA (OFDM) symbol with channel.
The signal detecting method of the present embodiment comprises the following steps:
Step S302: base station receives the OFDM wireless signal of self terminal, and finds detectable signal region according to system message
Time-domain signal y, carried out FFT, obtained frequency-region signal Y.
Step S304: the generation parameter of the detectable signal that base station is sent out according to target terminal, generates the frequency domain sequence of local detectable signal
Row X.
Step S306: detectable signal is carried out tim e-domain detection.
This step farther includes:
Step S3062: the frequency-region signal Y that will receive, is multiplied with the conjugate sequence of local frequency domain sequence X, obtains plural number letter
Number H (the i.e. first correlated series value), H (k)=Y (k) X*K (), wherein, k represents frequency-region signal index value.
Step S3064: H does IFFT conversion, obtains time-domain signal h (i.e. conversion time-domain detection signal).
Step S3066: in detection window, the amplitude peak A of detection h signal, record peak nmax, note detection window length
For LW, then
Wherein, " arg () " expression asks position function, n to represent time-domain signal index value.
Meanwhile, average W of h sampling point amplitude in calculating detection window；Judge the peak A of h whether be far longer than W (that is, it is judged that
Whether the peak A of h is more than the integral multiple of W.It should be noted that peak value always is more than average, it is described herein as the biggest
In this average, in general, it is the integral multiple of this average, and this integral multiple represents with N times, then N is the integer more than 1),
The most then judge that the signal received is as target detection signal, detection of end；Otherwise, step S3068 is carried out.
Step S3068: according to peak nmax, the time-domain detection signal y received is circulated displacement, obtains y ' (i.e. school
Positive time domain detectable signal).
Step S308: the detectable signal having carried out tim e-domain detection process is carried out frequency domain detection.
This step farther includes:
Step S3082: y ' is done FFT, obtains frequency-region signal Y ' (the i.e. conversion frequency domain detection letter of the detectable signal revised
Number).
Step S3084: the conjugate sequence of Y ' with local frequency domain sequence X is done slip related operation, obtains sequence of complex numbers S (i.e.
Second correlated series value, namely correction frequency domain detectable signal), a length of L of slip associated windowW。
Step S310: seek the peak n ' of S, if n ' occurs in the 1/L of S sequenceWPlace, then judge that the signal received is mesh
The detectable signal of mark terminal transmission.
Present embodiments provide BS and detect the detectable signal such as Sounding signal received, if the detection for target terminal is believed
Number method.The method carries out time domain and frequency domain computing to the detectable signal received, by contrasting with the feature of local training sequence,
The correctness of the detectable signal that detection receives.Additionally, by setting detection window length, the burden that the system that reduces calculates in real time,
Improve system-computed efficiency.
Embodiment four
With reference to Fig. 4, it is shown that the flow chart of steps of a kind of signal detecting method of four according to embodiments of the present invention.
This gives in the case of in Wimax system, detectable signal such as Sounding signal is cyclic pattern, signal is examined
The enforcement step surveyed, as a example by the FFT of OFDM symbol counts as N.
The signal detecting method of the present embodiment comprises the following steps:
Step S402: obtain the time-domain signal y of Sounding signal, carried out N point FFT, obtain frequency-region signal Y.
Step S404: according to 802.16e protocol requirement, produces the local frequency domain sequence X of target terminal Sounding signal, long
Degree is M.
Step S406: expand to N number of sampling point after the conjugate sequence two ends zero padding of local frequency domain sequence X, with the frequency domain letter received
Number Y correspondence sampling point is multiplied, and obtains complex signal H (the i.e. first correlated series value), H (k)=Y (k) X*(k), its
In, k represents frequency-region signal index value.
Step S408: H is carried out N point IFFT conversion, and seeks its sampling point amplitude, obtain time domain sequences h (when i.e. converting
Territory detectable signal).
Step S410: the note detection a length of L of windowW, LW=N/P, wherein, N represents that FFT counts, and P represents current Sounding
The instruction parameter of signal type (P is specified by agreement, can be largest loop displacement index, such as P value=4, and 8,16,32,9
Or 18, it is taken as that it is the instruction parameter of endless form detectable signal sequence).Detection window interval be N-N/2P+1 ＜=n ＜=N and
1 ＜=n ＜=N/2P, carries out tim e-domain detection to h sequence, it is assumed that the peak value detected is A, calculates peak
Wherein, " arg () " expression asks position function, n to represent time-domain signal index value.
Meanwhile, meansigma methods W of h sampling point amplitude in calculating detection window；Judge that A whether much larger than W, the most then judges to receive
Signal is the sounding signal that target terminal is launched, detection of end；Otherwise, step S412 is performed.
Step S412: according to peak nmax, the time-domain signal y received is carried out time domain displacement, obtains y ' (i.e. timing
Territory detectable signal), y '=y (nmaxmodN)。
Wherein, n is worked asmaxDuring for negative value, illustrate that peak value is in occurring in detection window N-N/2P+1 ＜=n ＜=N；Work as nmaxFor just
During value, illustrate that peak value is in occurring in detection window 1 ＜=n ＜=N/2P.
Step S414: y ' does N point FFT, takes out the frequency domain sequence of M corresponding sampling point, obtains the detection letter revised
Number frequency-region signal Y ' (i.e. conversion frequency domain detectable signal).
Step S416: the conjugate sequence of Y ' with local frequency domain sequence X is done slip related operation, obtains sequence of complex numbers S (i.e. school
Positive frequency domain detectable signal), a length of L of slip associated windowW。
S=xcorr (Y ', X), wherein, related operation is sought in xcorr () expression.
Step S418: seek the peak A of S average W of signal amplitude ' and the peak n ', and detection window in '.
If n ' occurs in the L of S sequenceWAt/2, and peak A ' be far longer than W ', then judge that receiving sequence is that target terminal is sent out
The detectable signal penetrated, otherwise, it is judged that this reception signal is not the Sounding signal of target terminal, and this signal detection terminates.
Embodiment five
With reference to Fig. 5, it is shown that the flow chart of steps of a kind of signal detecting method of five according to embodiments of the present invention.
This gives in the case of in Wimax system, detectable signal such as Sounding signal is decimation pattern, letter
Number detection enforcement step, as a example by the FFT of OFDM symbol counts as N.
The signal detecting method of the present embodiment comprises the following steps:
Step S502: obtain the time-domain received signal y of Sounding signal, carried out N point FFT, and according to system
The requirement that message and decimation signal produce, the sampling point on frequency domain ad-hoc location, form frequency-region signal Y, a length of M/D,
Wherein, M represents the length of Sounding signal sequence, and D represents the instruction parameter of current Sounding signal type, and (D is by assisting
View regulation, is extraction spacing value, such as D value=2,4,8 ... 128, it is taken as that be the finger of extraction mode detectable signal sequence
Show parameter.).
Step S504: according to 802.16e protocol requirement, produces the local frequency domain sequence X of target terminal Sounding signal, long
Degree M/D.
Step S506: the conjugate sequence of local frequency domain sequence X, is multiplied with the corresponding sampling point of frequency-region signal Y received, is answered
Number signal H (the i.e. first correlated series value), H (k)=Y (k) X*K (), wherein, k represents frequency-region signal index value.
Step S508: H is carried out M/D point IFFT conversion, and seeks its sampling point amplitude, obtain time domain sequences h and (i.e. convert
Time-domain detection signal).
Step S510: the note detection a length of L of windowW, LW=M/D, i.e. in the length that detection window interval is whole h sequence,
H sequence is carried out tim e-domain detection, it is assumed that the peak value detected is A, calculates peak
Wherein, " arg () " expression asks position function, n to represent time-domain signal index value.
Meanwhile, meansigma methods W of h sampling point amplitude in calculating detection window；Judge A whether much larger than W (i.e. more than N times of W,
N is the integer more than 1), the most then judge to receive the Sounding signal that signal is launched, detection of end as target terminal；No
Then, step S512 is carried out.
Step S512: according to peak nmax, the time-domain signal y received is carried out time domain displacement, obtains y ' (i.e. timing
Territory detectable signal), y '=y (nmaxmodN)。
Wherein, n is worked asmaxDuring for negative value, illustrate that peak value is in occurring in M-M/D+1 ＜=n ＜=M；Work as nmaxFor on the occasion of time,
Illustrate that peak value is in occurring in 1 ＜=n ＜=M/D.
Step S514: y ' is done N point FFT, and the requirement produced according to system message and decimation signal, frequency domain
Sampling point on ad-hoc location, obtains the frequency-region signal Y ' (i.e. conversion frequency domain detectable signal) of the detection reference signal revised, a length of
M/D。
Step S516: the conjugate sequence of Y ' with local frequency domain sequence X is done slip related operation, obtains sequence of complex numbers S (i.e. school
Positive frequency domain detectable signal), a length of L of slip associated windowW。
S=xcorr (Y ', X), wherein, related operation is sought in xcorr () expression.
Step S518: seek the peak A of S average W of signal amplitude ' and the peak n ', and detection window in '.
If n ' occurs in the L of S sequenceWAt/2, and peak A ' be far longer than W ', then judge that receiving sequence is that target terminal is sent out
The detectable signal penetrated, otherwise, it is judged that this reception signal is not the Sounding signal of target terminal, and this signal detection terminates.
Embodiment six
With reference to Fig. 6, it is shown that the structured flowchart of a kind of signal supervisory instrument of six according to embodiments of the present invention.
The signal supervisory instrument of the present embodiment includes: tim e-domain detection module 602, for using the local frequency of target terminal detectable signal
Territory sequence, carries out tim e-domain detection process to the frequency domain detectable signal received, and obtains correction time domain detectable signal；Frequency domain detection mould
Block 604, is used for using local frequency domain sequence, correction time domain detectable signal is carried out frequency domain detection process, obtains correction frequency domain detection
Signal；Peak detection block 606, for carrying out peakvalue's checking to correction frequency domain detectable signal.
Preferably, tim e-domain detection module 602 includes: the first acquisition module, is used for using local frequency domain sequence, to receive
Frequency domain detectable signal carries out seeking related operation, obtains the first correlated series value；Second acquisition module, for the first correlated series
Value carries out inverse fourier transform, obtains conversion time-domain detection signal；3rd acquisition module, for according to conversion time-domain detection signal
Peak, the time-domain detection signal received is carried out time domain displacement, obtains described correction time domain detectable signal.
Preferably, tim e-domain detection module 602 also includes: judge module, visits for detection conversion time domain in the detection window set
Survey the peak value of signal, it is judged that whether this peak value meets predetermined condition；If meeting, it is determined that the time-domain detection signal received is mesh
The detectable signal of mark terminal transmission；If being unsatisfactory for, then enter the 3rd acquisition module.
Preferably, when detectable signal sequence such as Sounding signal sequence is cyclic mode, a length of N/P of detection window,
Wherein, N represents that Fourier transform is counted, and P represents the instruction parameter of current detectable signal type；When detectable signal sequence such as
When Sounding signal sequence is decimation mode, a length of M/D of detection window, wherein, M represents detectable signal sequence
Such as the length of Sounding signal sequence, D represents the instruction parameter of current detectable signal type.
Preferably, it is judged that module is by the peak value of detection conversion time-domain detection signal in the detection window set, it is judged that this peak value is
No more than in detection window, N times of the average of conversion time-domain detection signal sampling point amplitude, N is the integer more than 1；If meeting,
Then determine that the time-domain detection signal received is the detectable signal that target terminal is launched；If being unsatisfactory for, then enter the 3rd acquisition module.
Preferably, frequency domain detection module 604 includes: the 4th acquisition module, for correction time domain detectable signal is carried out Fourier
Conversion, obtains conversion frequency domain detectable signal；5th acquisition module, is used for using local frequency domain sequence, to conversion frequency domain detection letter
Number carry out slip related operation, obtain the second correlated series value, as correction time domain detectable signal.
The signal supervisory instrument using the present embodiment realizes the method for signal detection and is referred to the relevant of said method embodiment and retouches
State, and there is the beneficial effect of said method embodiment, do not repeat them here.
It should be noted that the detectable signal in the above-mentioned multiple embodiments of the present invention is it is also assumed that be detection reference signal.Further,
Detectable signal in the multiple embodiment of the present invention is as a example by Sounding signal, but is not limited to this, and those skilled in the art should be bright
, technical scheme is applied equally to other detectable signal.It addition, above-mentioned multiple embodiments of the present invention are followed
802.16e agreement, but it is not limited to this, the agreement of the detection scheme of any present invention of being suitable for all can realize technical scheme,
The invention is not limited in this regard.
As can be seen from the above description, the signal detecting method of the detectable signal of the present invention and device, by twice detection
Meet the discrimination precision requirement of detectable signal detection, improve the verification and measurement ratio of target terminal detectable signal；By setting detection window
Length, the burden that the system that reduces calculates in real time, improve system-computed efficiency, thus, taken into account system and detectable signal is examined
The correctness surveyed requires and complexity requirement.
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 calculating
Device realizes, and they can concentrate on single calculating device, or is distributed on the network that multiple calculating device is formed,
Alternatively, they can realize with calculating the executable program code of device, it is thus possible to be stored in storing device
In perform by calculating device, and in some cases, can with the order being different from herein perform shown or described by step
Suddenly, or they are fabricated to respectively each integrated circuit modules, or the multiple modules in them or step are fabricated to single
Integrated circuit modules realizes.So, the present invention is not restricted to the combination of any specific hardware and software.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for those skilled in the art
For, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, any amendment of being made, etc.
With replacement, improvement etc., should be included within the scope of the present invention.
Claims (11)
1. a signal detecting method, it is characterised in that including:
Use the local frequency domain sequence of target terminal detectable signal, the frequency domain detectable signal received is carried out at tim e-domain detection
Reason, obtains correction time domain detectable signal；
Use described local frequency domain sequence, described correction time domain detectable signal is carried out frequency domain detection process, obtain correction frequency
Territory detectable signal；
Described correction frequency domain detectable signal is carried out peakvalue's checking.
Method the most according to claim 1, it is characterised in that the local frequency domain sequence of described use target terminal detectable signal,
The frequency domain detectable signal received carries out tim e-domain detection process, and the step obtaining correction time domain detectable signal includes:
Use described local frequency domain sequence, the frequency domain detectable signal received is asked related operation, obtain first and be correlated with
Sequential value；
Described first correlated series value is carried out inverse fourier transform, obtains conversion time-domain detection signal；
According to the peak of described conversion time-domain detection signal, the time-domain detection signal received is carried out time domain displacement,
Obtain described correction time domain detectable signal.
Method the most according to claim 2, it is characterised in that at the described peak according to conversion time-domain detection signal,
Before the time-domain detection signal received is carried out the step of time domain displacement, also include:
The peak value of described conversion time-domain detection signal is detected, it is judged that it is predetermined whether described peak value meets in the detection window set
Condition；
If meeting, it is determined that described in the time-domain detection signal that receives be the detectable signal that described target terminal is launched；
If being unsatisfactory for, then perform the described peak according to conversion time-domain detection signal, to the time-domain detection letter received
Number carry out the step of time domain displacement.
Method the most according to claim 3, it is characterised in that
When detectable signal sequence is for circulation cyclic mode, a length of N/P of described detection window, wherein, N represents Fourier
Leaf transformation is counted, and P represents the instruction parameter of current detectable signal type；
When detectable signal sequence is for extraction decimation mode, a length of M/D of described detection window, wherein, M table
Showing the length of described detectable signal sequence, D represents the instruction parameter of current detectable signal type.
Method the most according to claim 4, it is characterised in that described judge whether peak value meets the step of predetermined condition and include:
Judge whether described peak value is more than in described detection window, the N of the average of described conversion time-domain detection signal sampling point amplitude
Times, wherein, N is the integer more than 1.
6. according to the method described in any one of claim 1 to 5, it is characterised in that described use this locality frequency domain sequence, to described
Correction time domain detectable signal carries out frequency domain detection process, and the step obtaining correction frequency domain detectable signal includes:
Described correction time domain detectable signal is carried out Fourier transform, obtains conversion frequency domain detectable signal；
Use described local frequency domain sequence, described conversion frequency domain detectable signal is carried out slip related operation, obtains the second phase
Close sequential value, as described correction frequency domain detectable signal.
7. a signal supervisory instrument, it is characterised in that including:
Tim e-domain detection module, for using the local frequency domain sequence of target terminal detectable signal, to the frequency domain detection received
Signal carries out tim e-domain detection process, obtains correction time domain detectable signal；
Frequency domain detection module, is used for using described local frequency domain sequence, described correction time domain detectable signal is carried out frequency domain inspection
Survey processes, and obtains correction frequency domain detectable signal；
Peak detection block, for carrying out peakvalue's checking to described correction frequency domain detectable signal.
Device the most according to claim 7, it is characterised in that described tim e-domain detection module includes:
First acquisition module, is used for using described local frequency domain sequence, the frequency domain detectable signal received is asked relevant
Computing, obtains the first correlated series value；
Second acquisition module, for described first correlated series value carries out inverse fourier transform, obtains conversion time-domain detection
Signal；
3rd acquisition module, for the peak according to described conversion time-domain detection signal, to the time-domain detection received
Signal carries out time domain displacement, obtains described correction time domain detectable signal.
Device the most according to claim 8, it is characterised in that described tim e-domain detection module also includes:
Judge module, for detecting the peak value of described conversion time-domain detection signal, it is judged that described peak in the detection window set
Whether value meets predetermined condition；If meeting, it is determined that described in the time-domain detection signal that receives be that described target terminal is launched
Detectable signal；If being unsatisfactory for, then enter described 3rd acquisition module.
Device the most according to claim 9, it is characterised in that
When detectable signal sequence is for circulation cyclic mode, a length of N/P of described detection window, wherein, N represents Fourier
Leaf transformation is counted, and P represents the instruction parameter of current detectable signal type；
When detectable signal sequence is for extraction decimation mode, a length of M/D of described detection window, wherein, M table
Showing the length of described detectable signal sequence, D represents the instruction parameter of current detectable signal type.
11. according to the device described in any one of claim 7 to 10, it is characterised in that described frequency domain detection module includes:
4th acquisition module, for described correction time domain detectable signal carries out Fourier transform, obtains conversion frequency domain detection
Signal；
5th acquisition module, is used for using described local frequency domain sequence, described conversion frequency domain detectable signal is carried out slip phase
Close computing, obtain the second correlated series value, as described correction frequency domain detectable signal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110132745.XA CN102790741B (en) | 2011-05-20 | 2011-05-20 | signal detecting method and device |
| PCT/CN2011/080712 WO2012159407A1 (en) | 2011-05-20 | 2011-10-12 | Method and apparatus for signal detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110132745.XA CN102790741B (en) | 2011-05-20 | 2011-05-20 | signal detecting method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102790741A CN102790741A (en) | 2012-11-21 |
| CN102790741B true CN102790741B (en) | 2016-09-14 |
Family
ID=47156045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110132745.XA Expired - Fee Related CN102790741B (en) | 2011-05-20 | 2011-05-20 | signal detecting method and device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102790741B (en) |
| WO (1) | WO2012159407A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105939298B (en) * | 2015-12-30 | 2019-03-19 | 北京锐安科技有限公司 | A kind of method and device measuring distance of mobile terminal |
| CN107295329A (en) * | 2016-04-11 | 2017-10-24 | 晨星半导体股份有限公司 | Signal detecting method and signal supervisory instrument |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101588223A (en) * | 2009-06-22 | 2009-11-25 | 华为技术有限公司 | Method, device and system for acquiring multiple-input multiple-output channel information |
| WO2010035623A1 (en) * | 2008-09-26 | 2010-04-01 | 株式会社 エヌ・ティ・ティ・ドコモ | Receiving device and receiving method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050015913A (en) * | 2003-08-14 | 2005-02-21 | 삼성전자주식회사 | Apparatus and method for transmitting/receiving pilot in an orthogonal frequency division multiplexing communication system |
| US7583586B2 (en) * | 2004-07-02 | 2009-09-01 | Samsung Electronics Co., Ltd | Apparatus and method for transmitting/receiving pilot signal in communication system using OFDM scheme |
-
2011
- 2011-05-20 CN CN201110132745.XA patent/CN102790741B/en not_active Expired - Fee Related
- 2011-10-12 WO PCT/CN2011/080712 patent/WO2012159407A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010035623A1 (en) * | 2008-09-26 | 2010-04-01 | 株式会社 エヌ・ティ・ティ・ドコモ | Receiving device and receiving method |
| CN101588223A (en) * | 2009-06-22 | 2009-11-25 | 华为技术有限公司 | Method, device and system for acquiring multiple-input multiple-output channel information |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102790741A (en) | 2012-11-21 |
| WO2012159407A1 (en) | 2012-11-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104135305B (en) | Ranging and alignment system | |
| CN102780673B (en) | Detect for the timing acquisition of OFDM transmission and pattern and protection | |
| CN106411436B (en) | The communication system of arrival time is determined using match tracing | |
| US11095491B2 (en) | Methods and apparatus for frequency offset estimation | |
| CN101690054B (en) | Memory-saving method for generating soft bit values from an OFDM signal | |
| HUE027807T2 (en) | Method and apparatus for transmitting positioning reference signal in wireless communication system | |
| RU2008137608A (en) | SPATIAL PILOT SIGNAL STRUCTURE FOR WIRELESS COMMUNICATION WITH MANY ANTENNAS | |
| RU2013136857A (en) | METHOD, SYSTEM AND DEVICE FOR RECEIVING A JOINT USE OF A DOWNLOAD LINK IN COOPERATIVE MULTIPOINT TRANSMISSIONS | |
| US10284406B2 (en) | Method and apparatus for generating code sequence in a communication system | |
| CN102640530A (en) | Wireless base station | |
| CN108696305A (en) | High-precision frequency deviation measurement method suitable for LTE-A MIMO signal analysis systems | |
| CN104838702A (en) | Noise power estimation method and apparatus | |
| KR20120092270A (en) | Channel estimation method and apparatus thereof in a wireless communication system | |
| CN103095613B (en) | There is in SC-FDE system integer frequency offset and the channel parameter Combined estimator algorithm of ultralow complexity | |
| CN101997633A (en) | Method and system for multiplexing channel measurement pilots from different cells | |
| CN102790741B (en) | signal detecting method and device | |
| KR20060101850A (en) | Method for frequency synchronization of mobile telecommunication system using ofdm | |
| KR20120018706A (en) | Communication method of sharing characteristic information of communication system using preamble, method of generating the preamble and communication system of enalbling the methods | |
| US7876863B2 (en) | Method and system for improving timing position estimation in wireless communications networks | |
| CN106302286A (en) | A kind of signal to noise ratio blind estimating method of ofdm system | |
| CN115685068A (en) | Indoor wireless optical positioning method, device and system | |
| CN101507218B (en) | Interfering base stations recognition method and scheme for 802.16E systems | |
| CN103873412B (en) | For carrying out the method and apparatus of frequency domain average treatment to the DMRS symbols in OFDM symbol | |
| KR100992756B1 (en) | Apparatus and Method for estimating noise variance in Wireless Multi-carrier Communication Systems | |
| KR101441597B1 (en) | Apparatus and method for frequency offset estimation in fft-based frequency division multiple access systems |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20160727 Address after: 210012 Nanjing, Yuhuatai District, South Street, Bauhinia Road, No. 68 Applicant after: Nanjing Zhongxing Software Co.,Ltd. Address before: 518057 Nanshan District science and technology, Guangdong Province, South Road, No. 55, No. Applicant before: ZTE Corp. |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180427 Address after: No. 55, Nanshan District science and technology road, Nanshan District, Shenzhen, Guangdong Patentee after: ZTE Corp. Address before: 210012 No. 68, Bauhinia Road, Ningnan street, Yuhuatai District, Nanjing, Jiangsu Patentee before: Nanjing Zhongxing Software Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160914 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |