CN102790741A - Signal detection method and device - Google Patents
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Abstract
The invention discloses a signal detection method and device. The signal detection method includes: performing time domain detection treatment on received frequency domain detection signals by using local frequency domain sequence of target terminal detection signals to obtain calibration time domain detection signals; performing frequency domain detection treatment on the calibration time domain detection signals by using the local frequency domain sequence to obtain calibration frequency domain detection signals; and performing peak detection on the calibration frequency domain detection signals. By means of the signal detection method and device, the problem that detection accuracy of the detection signals cannot be effectively ensured during the detection of existing detection signals is solved, and the effect of improving the detection accuracy of the detection signals is achieved.
Description
Technical field
The present invention relates to the communications field, the signal detecting method and the device of detectable signal in a kind of OFDM (Orthogonal Frequency Division Multiplexing, OFDM) wireless communication system.
Background technology
OFDM is an a kind of multi-carrier transmission technology, the frequency orthogonal property of this each intercarrier of techniques make use, and transmission when realizing multicarrier has availability of frequency spectrum height, anti-fading ability is strong, realizes advantages such as simple.Therefore, be widely used in the wireless communication system at present.
In wireless communications environment,, can influence the information transmission quality of OFDM wireless communication system owing to have multipath and Doppler effect.In order to ensure information transmission quality, receiver need estimate radio channel status information, and then uses the radio channel status information of estimating to compensate to received signal, thereby guarantees the correctness of transmission information.
At present, the transmitter of ofdm system adopts emission detection signal (detection reference signal) or launches the mode of pilot signal, and the carrier of channel estimating is provided for receiver.Receiver is confirmed the source of signal through detectable signal (detection reference signal) or pilot signal are detected, and then carries out corresponding channel estimating and channel equalization to different user profile.
With the Wimax system is example, and each terminal can be launched different detectable signals simultaneously on identical running time-frequency resource, and the base station need be detected the detectable signal of receiving simultaneously, to distinguish different user.Then, estimate channel condition information to different user.
When detectable signal is detected, detect perhaps in time domain usually and select a kind of detection detectable signal in the frequency domain detection.For the method for frequency domain detection detectable signal, it has the precision advantage of higher, but simultaneously, its testing conditions requires harsh, is prone to the omission echo signal, and complexity is higher.And detect the method for detectable signal for time domain, though its testing conditions is less demanding, be subject to the influence of wireless channel, thereby be prone to the flase drop situation.Thus it is clear that,, all can't guarantee the accuracy that detectable signal detects no matter be to adopt frequency domain detection or time domain detection.
Summary of the invention
Main purpose of the present invention is to provide a kind of signal detecting method and device, to solve at least in the above-mentioned detectable signal testing process, can't guarantee effectively that detectable signal detects the problem of accuracy.
According to an aspect of the present invention, a kind of signal detecting method is provided, has comprised: used the local frequency domain sequence of target terminal detectable signal, the frequency domain detectable signal that receives is carried out time domain detect processing, obtain and proofread and correct the time domain detectable signal; Use local frequency domain sequence, carry out the frequency domain detection processing, obtain and proofread and correct the frequency domain detectable signal proofreading and correct the time domain detectable signal; Carry out the peak value detection to proofreading and correct the frequency domain detectable signal.
Preferably; Use the local frequency domain sequence of target terminal detectable signal; The frequency domain detectable signal that receives is carried out time domain detect processing; Obtaining the step of proofreading and correct the time domain detectable signal comprises: use local frequency domain sequence, the frequency domain detectable signal that receives is asked related operation, obtain the first correlated series value; The first correlated series value is carried out inverse fourier transform, obtain conversion time domain detectable signal; According to the peak of conversion time domain detectable signal, the time domain detectable signal that receives is carried out the time domain displacement, obtain and proofread and correct the time domain detectable signal.
Preferably; At peak according to conversion time domain detectable signal; The time domain detectable signal that receives is carried out also comprise before the step of time domain displacement: in the detection window of setting, detect the peak value of conversion time domain detectable signal, judge whether peak value satisfies predetermined condition; If satisfy, confirm that then the time domain detectable signal that receives is the detectable signal of target terminal emission; If do not satisfy, then carry out peak according to conversion time domain detectable signal, the time domain detectable signal that receives is carried out the step of time domain displacement.
Preferably, when the detectable signal sequence was circulation cyclic mode, the length of detection window was N/P, and wherein, N representes that Fourier transform counts, and P representes the indication parameter of current detectable signal type; When the detectable signal sequence was extraction decimation mode, the length of detection window was M/D, and wherein, M representes the length of detectable signal sequence, and D representes the indication parameter of current detectable signal type.
Preferably, judge that the step whether peak value satisfies predetermined condition comprises: judge peak value whether greater than in the detection window, the N of the average of conversion time domain detectable signal sampling point amplitude doubly, wherein N is the integer greater than 1.
Preferably, use local frequency domain sequence, carry out the frequency domain detection processing, obtain the step of proofreading and correct the frequency domain detectable signal and comprise: carry out Fourier transform to proofreading and correct the time domain detectable signal, obtain conversion frequency domain detectable signal proofreading and correct the time domain detectable signal; Use local frequency domain sequence,, obtain the second correlated series value, as proofreading and correct the frequency domain detectable signal the conversion frequency domain detectable signal related operation that slides.
According to a further aspect in the invention; A kind of signal supervisory instrument is provided, has comprised: the time domain detection module is used to use the local frequency domain sequence of target terminal detectable signal; The frequency domain detectable signal that receives is carried out time domain detect processing, obtain and proofread and correct the time domain detectable signal; The frequency domain detection module is used to use local frequency domain sequence, carries out the frequency domain detection processing to proofreading and correct the time domain detectable signal, obtains and proofreaies and correct the frequency domain detectable signal; Peak detection block is used for carrying out the peak value detection to proofreading and correct the frequency domain detectable signal.
Preferably, the time domain detection module comprises: first acquisition module, be used to use local frequency domain sequence, and the frequency domain detectable signal that receives is asked related operation, obtain the first correlated series value; Second acquisition module is used for the first correlated series value is carried out inverse fourier transform, obtains conversion time domain detectable signal; The 3rd acquisition module is used for the peak according to conversion time domain detectable signal, and the time domain detectable signal that receives is carried out the time domain displacement, obtains and proofreaies and correct the time domain detectable signal.
Preferably, the time domain detection module also comprises: judge module, be used in the detection window of setting, detecting the peak value of conversion time domain detectable signal, and judge whether peak value satisfies predetermined condition; If satisfy, confirm that then the time domain detectable signal that receives is the detectable signal of target terminal emission; If do not satisfy, then get into the 3rd acquisition module.
Preferably, when the detectable signal sequence was circulation cyclic mode, the length of detection window was N/P, and wherein, N representes that Fourier transform counts, and P representes the indication parameter of current detectable signal type; When the detectable signal sequence was extraction decimation mode, the length of detection window was M/D, and wherein, M representes the length of detectable signal sequence, and D representes the indication parameter of current detectable signal type.
Preferably, the frequency domain detection module comprises: the 4th acquisition module, be used for carrying out Fourier transform to proofreading and correct the time domain detectable signal, and obtain conversion frequency domain detectable signal; The 5th acquisition module is used to use local frequency domain sequence, to the conversion frequency domain detectable signal related operation that slides, obtains the second correlated series value, as proofreading and correct the frequency domain detectable signal.
Through the present invention, be employed in the method for carrying out twice detectable signal detection in the system respectively, wherein; Input adopts time domain to detect for the first time, effectively distinguishes with the detectable signal to the targeted customer, and this signal is carried out necessary reduction; Detect for the second time and adopt frequency domain detection; To carrying out frequency domain detection once more, be echo signal with definite this signal, thereby solved in the existing detectable signal testing process through the signal that detects after handling for the first time; Can't guarantee effectively that detectable signal detects the problem of accuracy, and then reach the effect that improves detectable signal detection accuracy.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart of steps according to a kind of signal detecting method of the embodiment of the invention one;
Fig. 2 is the flow chart of steps according to a kind of signal detecting method of the embodiment of the invention two;
Fig. 3 is the flow chart of steps according to a kind of signal detecting method of the embodiment of the invention three;
Fig. 4 is the flow chart of steps according to a kind of signal detecting method of the embodiment of the invention four;
Fig. 5 is the flow chart of steps according to a kind of signal detecting method of the embodiment of the invention five;
Fig. 6 is the structured flowchart according to a kind of signal supervisory instrument of the embodiment of the invention.
Embodiment
Hereinafter will and combine embodiment to specify the present invention with reference to accompanying drawing.Need to prove that under the situation of not conflicting, embodiment and the characteristic among the embodiment among the application can make up each other.
Embodiment one
With reference to Fig. 1, show flow chart of steps according to a kind of signal detecting method of the embodiment of the invention one.
The signal detecting method of present embodiment may further comprise the steps:
Step S102: use the local frequency domain sequence of target terminal detectable signal, the frequency domain detectable signal that receives is carried out time domain detect processing, obtain and proofread and correct the time domain detectable signal;
Before carrying out detectable signal such as Sounding input, need Mr. to become local detectable signal sequence.Then, use this sequence, as use the conjugate sequence of this sequence; The frequency domain detectable signal that receives is carried out time domain to be detected; Comprise and ask related operation, inverse fourier transform, can also according to circumstances further carry out processing such as time domain displacement, proofread and correct the time domain detectable signal to obtain.
Step S104: use local frequency domain sequence, carry out the frequency domain detection processing, obtain and proofread and correct the frequency domain detectable signal to proofreading and correct the time domain detectable signal;
After having obtained correction time domain detectable signal, continue to use the local frequency domain sequence of target terminal detectable signal, carry out frequency domain detection to proofreading and correct the time domain detectable signal, comprise and carry out Fourier transform and ask related operation etc., proofread and correct the frequency domain detectable signal to obtain.
Step S106: carry out the peak value detection to proofreading and correct the frequency domain detectable signal.
Through carrying out the peak value detection to proofreading and correct the frequency domain detectable signal; Can detect judgement to detectable signal; Whether the detectable signal to confirm to be received is the target terminal emission; And then carry out handled according to judged result, and estimate as carry out channel condition information according to detectable signal, perhaps require the terminal to retransmit etc.
In the correlation technique, when carrying out the detectable signal detection, frequency domain detection all has drawback separately because of using time domain to detect perhaps, can cause the omission or the flase drop of detectable signal, thereby can't guarantee the accuracy that detectable signal detects.Through present embodiment, adopt the method that detectable signal is carried out twice detection respectively, wherein; Input adopts time domain to detect for the first time, effectively distinguishes with the detectable signal to the targeted customer, and this signal is carried out necessary reduction; Detect for the second time and adopt frequency domain detection; To carrying out frequency domain detection once more, be echo signal with definite this signal, thereby solved in the existing detectable signal testing process through the signal that detects after handling for the first time; Can't guarantee effectively that detectable signal detects the problem of accuracy, and then reach the effect that improves detectable signal detection accuracy.
Embodiment two
With reference to Fig. 2, show flow chart of steps according to a kind of signal detecting method of the embodiment of the invention two.
The signal detecting method based on twice detectable signal detection of present embodiment may further comprise the steps:
Step S202:, generate local detectable signal sequence according to the parameter of target detection signal.
In this step, can adopt the method for defined in the existing 802.16e agreement, the producing method and the type of the detectable signal that adopts according to target terminal generate the frequency domain signal X of the detectable signal of target terminal, promptly local detectable signal sequence X.
Step S204: the detectable signal that receives is carried out the time domain coherent signal detect processing.
This step specifically can comprise:
Step S2042: utilize the conjugated signal of the frequency domain signal X of the target terminal detectable signal that step S202 produces, ask related operation, obtain the first correlated series value and be designated as H with the frequency domain detectable signal Y that receives; Then, H is carried out IFFT (inverse fourier transform), obtain time-domain signal (being conversion time domain detectable signal), this time-domain signal after the IFFT conversion of note H is h.
Step S2044: in detection window, detect the peak value of h signal.
Step S2046: judge whether this peak value satisfies predetermined condition,, then get into step S208 if satisfy; If do not satisfy, then get into step S2048.
Need to prove that this step is an optional step.Present embodiment can get into execution in step S2048 after having carried out step S2044.As the preferred version of present embodiment, in detection window, detect the peak value of h signal after, can judge whether this peak value satisfies predetermined condition, if this peak value satisfies predetermined condition, then getting into the signal that step S208 directly judges reception is echo signal; Otherwise, position butt joint time receiving territory signal y occurring according to peak value and carry out corresponding time domain displacement, the signal y after the displacement is designated as y ' (promptly proofreading and correct the time domain detectable signal).
Step S2048: the position occurs according to peak value the time-domain signal y that receives is carried out corresponding time domain displacement, the signal y after the displacement is designated as y ' (promptly proofreading and correct the time domain detectable signal), gets into step S206.
Step S206: the detectable signal after the time domain displacement of step S204 output is carried out the frequency domain coherent signal detect processing.
In this step; The sequential value y ' of the output of step S204 is done FFT (fast Flourier) conversion, obtain frequency-region signal (being conversion frequency domain detectable signal), be designated as Y '; The conjugated signal of the frequency domain signal X of the target terminal detectable signal that Y ' and step S202 the are produced related operation that slides; Obtain the second correlated series value (promptly proofreading and correct the frequency domain detectable signal), be designated as H ', in detection window, H ' is carried out peak value and detect.
Step S208: the output signal is judged.
In this step, to time domain output h or frequency domain output H ', carry out input and judge respectively, judge whether the detectable signal that receives is the target terminal emission, the end signal testing process.
The problem that exists in the detectable signal detection method of present embodiment to existing ofdm system;, accuracy of detection higher like computation complexity requires harsh; Be prone to omission or flase drop and be unfavorable for the real-time correct detection and the use of signal; A kind of method of in system, carrying out twice detectable signal detection respectively is provided, can have satisfied the discrimination precision that detectable signal detects through twice detection, the system that taken into account requires and the complexity requirement the correctness that detectable signal detects.Wherein, input is that time domain detects for the first time, and purpose is to distinguish the detectable signal of target terminal, and this detectable signal is carried out necessary reduction; Detection for the second time is frequency domain detection, under the situation that system's operand is supported, to carrying out the frequency domain correlation computations once more through the detectable signal after detection is handled for the first time, to confirm that this detectable signal is the detectable signal of target terminal.
Need to prove, for asking related operation and slip related operation among a plurality of embodiment of the present invention, can repeat no more at this by those skilled in the art with reference to asking related operation and the completion of slip related operation in existing frequency domain equalization or the time domain equalization.
Embodiment three
With reference to Fig. 3, show flow chart of steps according to a kind of signal detecting method of the embodiment of the invention three.
In the present embodiment, be example through emission detection signal such as Sounding burst to base station feedback wireless channel state information (CSI) with terminal in the present Wimax system.The Sounding burst is a kind of detectable signal clocklike of 802.16e agreement regulation; The Sounding burst is divided into cyclic (circulation) mode and decimation (extraction) mode, and the mode of two types of Sounding burst generations is clearly provided by the 802.16e agreement.
In the 802.16e agreement; SS (Subscriber Station; The terminal use) launches UL Sounding (uplink sounding) signal according to IE (the information element information element) information of former frame; BS (base station) lateral root is according to the characteristics of known emission information and Sounding burst; At first detect the Sounding burst that target terminal is launched, can use channel estimating to obtain the up channel state information of each useful subcarrier on 1 OFDMA (OFDM) symbol then.
The signal detecting method of present embodiment may further comprise the steps:
Step S302: the base station receives the OFDM wireless signal of self terminal, and finds the regional time-domain signal y of detectable signal according to system message, and it is carried out the FFT conversion, obtains frequency-region signal Y.
Step S304: the generation parameter of the detectable signal that the base station is sent out according to target terminal generates the frequency domain sequence X of local detectable signal.
Step S306: detectable signal is carried out time domain detect.
This step further comprises:
Step S3062: with the frequency-region signal Y that receives, multiply each other, obtain complex signal H (i.e. the first correlated series value), H (k)=Y (k) X with the conjugate sequence of local frequency domain sequence X
*(k), wherein, k representes the frequency-region signal index value.
Step S3064: H is done the IFFT conversion, obtain time-domain signal h (being conversion time domain detectable signal).
Step S3066: in detection window, detect the amplitude peak A of h signal, record peak n
Max, note detection window length is L
W, then
wherein; " arg () " expression asks position function, n to represent the time-domain signal index value.
Simultaneously, calculate the average W of h sampling point amplitude in the detection window; Whether the peak A of judging h is far longer than W, and (that is whether the peak A of, judging h is greater than the integral multiple of W.Need to prove that peak value can be described as being far longer than this average at this, in general greater than average forever; It is the integral multiple of this average, and this integral multiple representes doubly that with N then N is the integer greater than 1); If judge that then the signal that receives is a target detection signal, detection of end; Otherwise, carry out step S3068.
Step S3068: according to peak n
Max, the time domain detectable signal y that receives is carried out cyclic shift, obtain y ' (promptly proofreading and correct the time domain detectable signal).
Step S308: the detectable signal to having carried out time domain detection processing carries out frequency domain detection.
This step further comprises:
Step S3082: y ' is done the FFT conversion, the frequency-region signal Y ' of the detectable signal that obtains revising (being conversion frequency domain detectable signal).
Step S3084: Y ' is done the slip related operation with the conjugate sequence of local frequency domain sequence X, obtain sequence of complex numbers S (promptly the second correlated series value is also promptly proofreaied and correct the frequency domain detectable signal), the slip associated window is long to be L
W
Step S310: ask the peak n ' of S, if n ' appears at the 1/L of S sequence
WThe place judges that then the signal that receives is the detectable signal of target terminal emission.
Whether present embodiment provides BS to detect detectable signal such as the Sounding signal that receives, be the method for the detectable signal of target terminal.This method is carried out time domain and frequency domain computing to the detectable signal that receives, and contrasts through the characteristics with local training sequence, detects the correctness of the detectable signal that receives.In addition,, reduced the burden that system is calculated in real time, improved system-computed efficient through setting detection window length.
Embodiment four
With reference to Fig. 4, show flow chart of steps according to a kind of signal detecting method of the embodiment of the invention four.
Present embodiment has provided in the Wimax system detectable signal such as the Sounding signal is under the situation of cyclic pattern, the implementation step of input, and counting with the FFT of OFDM symbol is that N is an example.
The signal detecting method of present embodiment may further comprise the steps:
Step S402: obtain the time-domain signal y of Sounding signal, it is carried out N point FFT conversion, obtain frequency-region signal Y.
Step S404: according to the 802.16e protocol requirement, produce the local frequency domain sequence X of target terminal Sounding signal, length is M.
Step S406: expand to N sampling point after the conjugate sequence two ends zero padding of local frequency domain sequence X, multiply each other, obtain complex signal H (i.e. the first correlated series value), H (k)=Y (k) X with the corresponding sampling point of frequency-region signal Y that receives
*(k), wherein, k representes the frequency-region signal index value.
Step S408: H is carried out N point IFFT conversion, and ask its sampling point amplitude, obtain time domain sequences h (being conversion time domain detectable signal).
Step S410: the note detection window is long to be L
W, L
W=N/P, wherein, N representes that FFT counts, P representes that (P is stipulated by agreement for the indication parameter of current Sounding signal type; Can be largest loop displacement index, like P value=4,8,16; 32,9 or 18, therefore think the indication parameter of endless form detectable signal sequence).The detection window interval is N-N/2P+1＜=n＜=N and 1＜=n＜=N/2P, the h sequence is carried out time domain detect, and supposes that detected peak value is A, calculates peak
Simultaneously, calculate the mean value W of h sampling point amplitude in the detection window; Whether judge A much larger than W, if then judge to receive the sounding signal that signal is the target terminal emission, detection of end; Otherwise, execution in step S412.
Step S412: according to peak n
Max, the time-domain signal y that receives is carried out the time domain displacement, obtain y ' (promptly proofreading and correct the time domain detectable signal), y '=y (n
MaxModN).
Wherein, work as n
MaxDuring for negative value, explain that peak value is in appearing at detection window N-N/2P+1＜=n＜=N; Work as n
MaxFor on the occasion of the time, explain that peak value is in appearing at detection window 1＜=n＜=N/2P.
Step S414: y ' is done N point FFT conversion, take out the frequency domain sequence of M corresponding sampling point, the frequency-region signal Y ' of the detectable signal that obtains revising (being conversion frequency domain detectable signal).
Step S416: Y ' is done the slip related operation with the conjugate sequence of local frequency domain sequence X, obtain sequence of complex numbers S (promptly proofreading and correct the frequency domain detectable signal), the slip associated window is long to be L
W
S=xcorr (Y ', X), wherein, related operation is asked in xcorr () expression.
Step S418: the peak A of asking S ' and peak n ', and the average W ' of the interior signal amplitude of detection window.
If n ' appears at the L of S sequence
W/ 2 places, and peak A ' be far longer than W ', judge that then receiving sequence is the detectable signal of target terminal emission, otherwise, judge the Sounding signal that this reception signal is not a target terminal, this input finishes.
Embodiment five
With reference to Fig. 5, show flow chart of steps according to a kind of signal detecting method of the embodiment of the invention five.
Present embodiment has provided in the Wimax system detectable signal such as the Sounding signal is under the situation of decimation pattern, the implementation step of input, and counting with the FFT of OFDM symbol is that N is an example.
The signal detecting method of present embodiment may further comprise the steps:
Step S502: the time domain that obtains the Sounding signal receives signal y, and it is carried out N point FFT conversion, and according to the requirement of system message and the generation of decimation signal; Sampling point on the frequency domain ad-hoc location is formed frequency-region signal Y, and length is M/D; Wherein, M representes the length of Sounding burst, and D representes that (D is stipulated by agreement for the indication parameter of current Sounding signal type; Be to extract spacing value, like D value=2,4; 8 ... 128, therefore think to extract the indication parameter of mode detectable signal sequence.)。
Step S504:, produce the local frequency domain sequence X of target terminal Sounding signal, length M/D according to the 802.16e protocol requirement.
Step S506: the conjugate sequence of local frequency domain sequence X, multiply each other with the corresponding sampling point of frequency-region signal Y that receives, obtain complex signal H (i.e. the first correlated series value), H (k)=Y (k) X
*(k), wherein, k representes the frequency-region signal index value.
Step S508: H is carried out M/D point IFFT conversion, and ask its sampling point amplitude, obtain time domain sequences h (being conversion time domain detectable signal).
Step S510: the note detection window is long to be L
W, L
W=M/D promptly, is the length of whole h sequence in the detection window interval, the h sequence is carried out time domain detect, and supposes that detected peak value is A, calculates peak
Simultaneously, calculate the mean value W of h sampling point amplitude in the detection window; Whether judge A much larger than W (promptly greater than N times of W, N is the integer greater than 1), if then judge to receive the Sounding signal that signal is the target terminal emission, detection of end; Otherwise, carry out step S512.
Step S512: according to peak n
Max, the time-domain signal y that receives is carried out the time domain displacement, obtain y ' (promptly proofreading and correct the time domain detectable signal), y '=y (n
MaxModN).
Wherein, work as n
MaxDuring for negative value, explain that peak value is in appearing at M-M/D+1＜=n＜=M; Work as n
MaxFor on the occasion of the time, explain that peak value is in appearing at 1＜=n＜=M/D.
Step S514: y ' is done N point FFT conversion, and the requirement that produces according to system message and decimation signal, the sampling point on the frequency domain ad-hoc location, the frequency-region signal Y ' of the detection reference signal that obtains revising (being conversion frequency domain detectable signal), length is M/D.
Step S516: Y ' is done the slip related operation with the conjugate sequence of local frequency domain sequence X, obtain sequence of complex numbers S (promptly proofreading and correct the frequency domain detectable signal), the slip associated window is long to be L
W
S=xcorr (Y ', X), wherein, related operation is asked in xcorr () expression.
Step S518: the peak A of asking S ' and peak n ', and the average W ' of the interior signal amplitude of detection window.
If n ' appears at the L of S sequence
W/ 2 places, and peak A ' be far longer than W ', judge that then receiving sequence is the detectable signal of target terminal emission, otherwise, judge the Sounding signal that this reception signal is not a target terminal, this input finishes.
Embodiment six
With reference to Fig. 6, show structured flowchart according to a kind of signal supervisory instrument of the embodiment of the invention six.
The signal supervisory instrument of present embodiment comprises: time domain detection module 602, be used to use the local frequency domain sequence of target terminal detectable signal, and the frequency domain detectable signal that receives is carried out time domain detect and handle, obtain and proofread and correct the time domain detectable signal; Frequency domain detection module 604 is used to use local frequency domain sequence, carries out the frequency domain detection processing to proofreading and correct the time domain detectable signal, obtains and proofreaies and correct the frequency domain detectable signal; Peak detection block 606 is used for carrying out the peak value detection to proofreading and correct the frequency domain detectable signal.
Preferably, time domain detection module 602 comprises: first acquisition module, be used to use local frequency domain sequence, and the frequency domain detectable signal that receives is asked related operation, obtain the first correlated series value; Second acquisition module is used for the first correlated series value is carried out inverse fourier transform, obtains conversion time domain detectable signal; The 3rd acquisition module is used for the peak according to conversion time domain detectable signal, and the time domain detectable signal that receives is carried out the time domain displacement, obtains said correction time domain detectable signal.
Preferably, time domain detection module 602 also comprises: judge module, be used in the detection window of setting, detecting the peak value of conversion time domain detectable signal, and judge whether this peak value satisfies predetermined condition; If satisfy, confirm that then the time domain detectable signal that receives is the detectable signal of target terminal emission; If do not satisfy, then get into the 3rd acquisition module.
Preferably, when detectable signal sequence such as Sounding burst were the cyclic mode, the length of detection window was N/P, and wherein, N representes that Fourier transform counts, and P representes the indication parameter of current detectable signal type; When detectable signal sequence such as Sounding burst were the decimation mode, the length of detection window was M/D, and wherein, M representes the length of detectable signal sequence such as Sounding burst, and D representes the indication parameter of current detectable signal type.
Preferably, judge module is through detecting the peak value of conversion time domain detectable signal in the detection window of setting, and judges this peak value whether greater than in the detection window, the N of the average of conversion time domain detectable signal sampling point amplitude doubly, N is the integer greater than 1; If satisfy, confirm that then the time domain detectable signal that receives is the detectable signal of target terminal emission; If do not satisfy, then get into the 3rd acquisition module.
Preferably, frequency domain detection module 604 comprises: the 4th acquisition module, be used for carrying out Fourier transform to proofreading and correct the time domain detectable signal, and obtain conversion frequency domain detectable signal; The 5th acquisition module is used to use local frequency domain sequence, to the conversion frequency domain detectable signal related operation that slides, obtains the second correlated series value, as proofreading and correct the time domain detectable signal.
Use the signal supervisory instrument of present embodiment to realize that the method for input can be with reference to the associated description of said method embodiment, and have the beneficial effect of said method embodiment, repeat no more at this.
Need to prove that the detectable signal among the above-mentioned a plurality of embodiment of the present invention also can be thought detection reference signal.And the detectable signal among a plurality of embodiment of the present invention is an example with the Sounding signal, but is not limited thereto, and those skilled in the art should understand, and technical scheme of the present invention is applicable to other detectable signal too.In addition, above-mentioned a plurality of embodiment of the present invention follow the 802.16e agreement, but are not limited thereto, and any agreement that is suitable for detection scheme of the present invention all can realize technical scheme of the present invention, and the present invention does not limit this.
From above description, can find out that the signal detecting method of detectable signal of the present invention and device have satisfied the discrimination precision requirement that detectable signal detects through twice detection, have improved the verification and measurement ratio of target terminal detectable signal; Through setting detection window length, reduced the burden that system is calculated in real time, improved system-computed efficient, thus, the system that taken into account requires and the complexity requirement the correctness that detectable signal detects.
Obviously, it is apparent to those skilled in the art that above-mentioned each module of the present invention or each step can realize with the general calculation device; They can concentrate on the single calculation element; Perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element; Thereby; Can they be stored in the storage device and carry out, and in some cases, can carry out step shown or that describe with the order that is different from here by calculation element; Perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a signal detecting method is characterized in that, comprising:
Use the local frequency domain sequence of target terminal detectable signal, the frequency domain detectable signal that receives is carried out time domain detect processing, obtain and proofread and correct the time domain detectable signal;
Use said local frequency domain sequence, said correction time domain detectable signal is carried out frequency domain detection handle, obtain and proofread and correct the frequency domain detectable signal;
Said correction frequency domain detectable signal is carried out peak value to be detected.
2. method according to claim 1 is characterized in that, the local frequency domain sequence of said use target terminal detectable signal carries out time domain to the frequency domain detectable signal that receives and detects processing, obtains the step of proofreading and correct the time domain detectable signal and comprises:
Use said local frequency domain sequence, the frequency domain detectable signal that receives is asked related operation, obtain the first correlated series value;
The said first correlated series value is carried out inverse fourier transform, obtain conversion time domain detectable signal;
According to the peak of said conversion time domain detectable signal, the time domain detectable signal that receives is carried out the time domain displacement, obtain said correction time domain detectable signal.
3. method according to claim 2 is characterized in that, at said peak according to conversion time domain detectable signal, the time domain detectable signal that receives is carried out also comprise before the step of time domain displacement:
In the detection window of setting, detect the peak value of said conversion time domain detectable signal, judge whether said peak value satisfies predetermined condition;
If satisfy, confirm that then the said time domain detectable signal that receives is the detectable signal of said target terminal emission;
If do not satisfy, then carry out said peak according to conversion time domain detectable signal, the time domain detectable signal that receives is carried out the step of time domain displacement.
4. method according to claim 3 is characterized in that,
When the detectable signal sequence was circulation cyclic mode, the length of said detection window was N/P, and wherein, N representes that Fourier transform counts, and P representes the indication parameter of current detectable signal type;
When the detectable signal sequence was extraction decimation mode, the length of said detection window was M/D, and wherein, M representes the length of said detectable signal sequence, and D representes the indication parameter of current detectable signal type.
5. method according to claim 4 is characterized in that, the said step of judging whether peak value satisfies predetermined condition comprises:
Judge said peak value whether greater than in the said detection window, the N of the average of said conversion time domain detectable signal sampling point amplitude doubly, wherein, N is the integer greater than 1.
6. according to each described method of claim 1 to 5, it is characterized in that the local frequency domain sequence of said use carries out frequency domain detection to said correction time domain detectable signal and handles, and obtains the step of proofreading and correct the frequency domain detectable signal and comprises:
Said correction time domain detectable signal is carried out Fourier transform, obtain conversion frequency domain detectable signal;
Use said local frequency domain sequence,, obtain the second correlated series value, as said correction frequency domain detectable signal to the said conversion frequency domain detectable signal related operation that slides.
7. a signal supervisory instrument is characterized in that, comprising:
The time domain detection module is used to use the local frequency domain sequence of target terminal detectable signal, the frequency domain detectable signal that receives is carried out time domain detect and handle, and obtains and proofreaies and correct the time domain detectable signal;
The frequency domain detection module is used to use said local frequency domain sequence, said correction time domain detectable signal is carried out frequency domain detection handle, and obtains and proofreaies and correct the frequency domain detectable signal;
Peak detection block is used for that said correction frequency domain detectable signal is carried out peak value and detects.
8. device according to claim 7 is characterized in that, said time domain detection module comprises:
First acquisition module is used to use said local frequency domain sequence, and the frequency domain detectable signal that receives is asked related operation, obtains the first correlated series value;
Second acquisition module is used for the said first correlated series value is carried out inverse fourier transform, obtains conversion time domain detectable signal;
The 3rd acquisition module is used for the peak according to said conversion time domain detectable signal, and the time domain detectable signal that receives is carried out the time domain displacement, obtains said correction time domain detectable signal.
9. device according to claim 8 is characterized in that, said time domain detection module also comprises:
Judge module is used in the detection window of setting, detecting the peak value of said conversion time domain detectable signal, judges whether said peak value satisfies predetermined condition; If satisfy, confirm that then the said time domain detectable signal that receives is the detectable signal of said target terminal emission; If do not satisfy, then get into said the 3rd acquisition module.
10. device according to claim 9 is characterized in that,
When the detectable signal sequence was circulation cyclic mode, the length of said detection window was N/P, and wherein, N representes that Fourier transform counts, and P representes the indication parameter of current detectable signal type;
When the detectable signal sequence was extraction decimation mode, the length of said detection window was M/D, and wherein, M representes the length of said detectable signal sequence, and D representes the indication parameter of current detectable signal type.
11., it is characterized in that said frequency domain detection module comprises according to each described device of claim 7 to 10:
The 4th acquisition module is used for said correction time domain detectable signal is carried out Fourier transform, obtains conversion frequency domain detectable signal;
The 5th acquisition module is used to use said local frequency domain sequence, to the said conversion frequency domain detectable signal related operation that slides, obtains the second correlated series value, as said correction frequency domain detectable signal.
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| CN105939298A (en) * | 2015-12-30 | 2016-09-14 | 北京锐安科技有限公司 | Method and device for 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 |
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| WO2012159407A1 (en) | 2012-11-29 |
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