CN101741480A - Method and device for detecting signal receiving performance of digital broadcasting system - Google Patents
Method and device for detecting signal receiving performance of digital broadcasting system Download PDFInfo
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Abstract
The invention discloses a method for detecting signal receiving performance of a digital broadcasting system. The method comprises the following steps of: presetting a strong path threshold for receiving a signal, a main path position range and a protective interval between adjacent received signals; searching the received signal to acquire all strong paths surpassing the strong path threshold and determining a strong path position and a corresponding main path position; judging whether the main path position of the received signal falls in a predetermined main path position range; and judging the distance between the main path position of the received signal within the predetermined main path position range and all strong path positions is positioned in the protective interval so as to detect the signal receiving performance. The method and the device can correctly detect the signal receiving performance of a receiving terminal. The invention also discloses a device for detecting the signal receiving performance of the digital broadcasting system.
Description
Technical field
The present invention relates to digital information transmission technical field, relate in particular to a kind of method and apparatus that detects digit broadcasting system receiving terminal signal receiving performance.
Background technology
At present, digital broadcasting with its broad covered area, contain much information, broadcasting and the high advantage of the availability of frequency spectrum that mobile acceptance is good, point-to-area, therefore become an important component part of present information communication.
But the subject matter that digital broadcasting exists is multipath transmisstion.Because the complexity of surface state, the signal of emission arrive receiving terminal through mulitpath often, promptly have the multipath transmisstion effect.Multipath effect causes received signal overlapped, and making transmits produces distortion at receiving terminal, influences signal transmission quality.In Digital Television received, multipath disturbed may make to receive and falls flat, and the multipath annoyance level of detection signal is the key point of receiver received signal performance.
If receiver only receives the signal of a certain frequency that a transmitter list directly sends, then receiver is in receiving course, the signal that receives is carried out detections such as frame synchronization and channel type, thus the correct judgement of the collection of letters performance that achieves a butt joint and realize accurate demodulation.Such signal will have only a significantly strong footpath L, and as shown in the figure, wherein Fig. 1 is the transmit figure of single transmitter at a certain frequency.
Yet, generally, digital broadcasting all is a multipath transmisstion, promptly exists a plurality of transmitters to send signal, perhaps the signal of transmitter emission arrives receiving terminals through many aerial propagation paths, like this signal of signal for superposeing that receive on a certain frequency of receiver.Therefore may have a plurality of apparent in view strong footpaths, L0 as shown in Figure 2, L1 and L2 etc., wherein Fig. 2 is shown as multi-transmitter transmitting at a certain frequency.In a plurality of strong footpaths, L0 is a most powerful path, is called main footpath.And because each footpath time of arrival (toa) that receiver receives is different, these strong footpaths may appear at all possible position.Interval when strong footpath and main footpath, at interval the time, the performance of reception will descend the multipath transmisstion signal time delay significantly greater than the protection between two adjacent signals in the system in other words, the correct demodulation of collecting mail to cause achieving a butt joint number.
As mentioned above, multipath and the time postpone a meeting or conference that making transmits produces distortion at receiving terminal, influence signal transmission quality, reception is fallen flat.Therefore, in order better to detect the distortion and the disturbed condition of received signal, whether reach requirement and then realize the synchronous operations such as Channel Detection, accurate demodulation that reach so that definite signal receives, need the problem that a kind of new method solves appearance in the real figure broadcasting that proposes badly.
Summary of the invention
Purpose of the present invention is intended to one of solve the aforementioned problems in the prior at least.
For this reason, embodiments of the invention propose a kind of method and apparatus that detects signal receiving performance of digital broadcasting system, receive the accurate judgement and the detection of terminal signaling receptivity to achieve a butt joint, thereby improve the play quality of digital broadcasting.
Method according to the detection signal receiving performance of digital broadcasting system of the embodiment of the invention may further comprise the steps: preestablish between the strong footpath thresholding that is used for received signal, main path position range and the adjacent reception signal protection at interval; Current received signal is searched for, exceed all strong footpaths of described predetermined strong footpath thresholding, and determine the strong path position and corresponding main path position of described current received signal with acquisition; Whether the main path position of judging described current received signal drops in the described predetermined main path position scope; And judgement drops on the main path position of the described current received signal in the described predetermined main path position scope and whether the distance between all strong path positions is positioned at described protection at interval, to detect the receptivity of described current demand signal.
The further embodiment according to the present invention, searching out described strong footpath is to utilize auto-correlation in sliding window and the window, according to the window length of the described sliding window of length setting of synchronizing signal in the described digit broadcasting system frame signal.
According to a further aspect in the invention, embodiments of the invention propose a kind of device that detects the signal receiving performance of digit broadcasting system, comprise: default unit is used to preestablish the protection interval between the strong footpath thresholding of received signal, main path position range and the adjacent reception signal; Search unit is used for searching out all strong footpaths that described current received signal exceeds described predetermined strong footpath thresholding, with strong path position and the corresponding main path position of determining described current received signal; Judging unit, be used to judge whether the main path position of described current received signal drops in the described predetermined main path position scope, and whether the main path position that drops on the described current received signal in the described predetermined main path position scope is positioned at described protection interval with the distance between all strong path positions; And detecting unit, be used for detecting the receptivity of described current demand signal according to the judged result of described judging unit.
The present invention passes through to set conditions such as strong footpath thresholding, main path position range and protection interval, and adjudicates to received signal, thereby can accurately detect the receptivity of receiving terminal.
Aspect that the present invention adds and advantage part in the following description provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Description of drawings
Above-mentioned and/or additional aspect of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment below in conjunction with accompanying drawing, wherein:
Fig. 1 is the transmit figure of single transmitter at a certain frequency;
Fig. 2 is shown as the transmit figure of multi-transmitter at a certain frequency;
Fig. 3 is the structure calcspar of the signal receiving performance of digital broadcasting system checkout gear of the embodiment of the invention;
Fig. 4 is the flow chart of steps of the signal receiving performance of digital broadcasting system detection method of the embodiment of the invention;
Fig. 5 is the CMMB system-frame signal structure schematic diagram of the embodiment of the invention;
Fig. 6 is the sliding window search principle figure of the embodiment of the invention; With
Fig. 7 is the detection method determining step flow chart of the embodiment of the invention.
Embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein identical from start to finish or similar label is represented identical or similar elements or the element with identical or similar functions.Below by the embodiment that is described with reference to the drawings is exemplary, only is used to explain the present invention, and can not be interpreted as limitation of the present invention.
Below in conjunction with Fig. 3 signal receiving performance of digital broadcasting system checkout gear of the present invention is made an explanation, this figure is the structure calcspar of the signal receiving performance of digital broadcasting system checkout gear of the embodiment of the invention.
As shown in Figure 3, checkout gear comprises default unit 12, search unit 14, judging unit 16 and detecting unit 22.Wherein, default unit 12 is used to preestablish the protection interval between the strong footpath thresholding of received signal, main path position range and the adjacent reception signal.Strong footpath detection threshold can be set with relevant technical requirement flexibly according to the signal of transmission, and in the CMMB system, default strong footpath thresholding theoretical value is 1/3 of a received signal peak-peak.Main path position range can be according to the set positions of synchronizing signal in the frame signal of digit broadcasting system, and changes flexibly according to different systems.Protection type at interval can be diversified, and protection size at interval can change flexibly according to system.
In one embodiment, when adopting sliding window, long 2K the corresponding space of putting of window can be set additionally, between two synchronizing signals coincide point be arranged when avoiding with machine testing.Therefore, in N+2K signaling point of input, slide, extract the sampled point sequence of N 2K size, for example 1～2K, 2～2K+1...N～2K+N-1 by window.Then, K point before in the window of N sampled point sequence correspondence extracting and back K point are carried out correlation computations, thereby obtain the real part of N correlation function and the mould value or the square value of imaginary part.Thereby the position at the peak-peak of obtaining (main footpath) place and the position that surpasses place, the strong footpath of predetermined threshold value.
To each system; need protection between signal at interval; therefore according to presetting the protection interval of setting unit 12; the current received signal that 20 pairs of second judging units drop in the predetermined main path position scope is further judged, with the main path position of determining this signal and the protection the interval whether distance between all strong path positions is positioned at setting.Similarly, judged result is input to detecting unit 22.
Detecting unit 22 is used for detecting according to the judged result of first judging unit 18 and 20 outputs of second judging unit receptivity of current demand signal.In the judged result of first judging unit 18 output is the position in the main footpath of current received signal when not dropping in the preset range, and detecting unit 22 detects and receives these digital systems and receive the performance of this signal for abominable.At interval the time, it is badly that detecting unit 22 detects the performance that receives this digital system received signal in the judged result of second judging unit 20 output is the main path position of current received signal with the distance between all strong path positions is not positioned at setting all protection.Be that distance between main path position and all the strong path positions is when all being positioned at the protection interval of setting only in the judged result of second judging unit 20 output; 22 of detecting units detect performance that this digit broadcasting system receives this signal for good, can satisfy the demand and realize the correct demodulation of signal.
Below, will be in conjunction with Fig. 4 to Fig. 7, the signal receiving performance of digital broadcasting system detection method of the embodiment of the invention is elaborated.
At first, with reference to figure 4, this figure is the signal receiving performance of digital broadcasting system detection method flow chart of steps of the embodiment of the invention.
As shown in the figure, at first need to preestablish protection at interval (step 102) between the strong footpath thresholding that is used for corresponding digit broadcasting system received signal, main path position range and the adjacent reception signal.Then,, current received signal is searched for, be scheduled to strong directly all strong footpaths of thresholding, and determine the position (step 104) of strong path position and maximum diameter (directly main) thereof to obtain to exceed according to predetermined strong footpath thresholding.Then, whether the main path position of judging the current received signal that searches drops in the predetermined main path position range (step 106).To dropping on the current received signal in the predetermined main path position scope, judge further whether the distance between its main path position and all the strong path positions is positioned at predetermined protection at interval, to detect the receptivity (step 108) of current demand signal.
Below, will make detailed description to the strong path search step of receptivity detection method of the present invention in conjunction with Fig. 5 and Fig. 6 specific embodiment.Wherein, Fig. 5 is the CMMB system-frame signal structure schematic diagram of the embodiment of the invention, and Fig. 6 is the sliding window search principle figure of the embodiment of the invention.
Here, the present invention will present invention is described to the strong path search of received signal of CMMB system in conjunction with sliding window search, but it is to be noted, the strong path search of received signal of the present invention is not limited to this specific embodiment, and the strong path search mode of any known technology of suitable various digit broadcasting systems is all applicable to the present invention.
Frame signal for each time slot that receives in the CMMB system comprises N sampled point signal, sampling sliding window mode search principle is: the size of each window is 2K, slip by window, extract N size respectively and be the sampled point sequence of 2K, and preceding K point in the window of each sequence is carried out auto-correlation with back K point calculate, thereby obtain the real part of N correlation function and the mould value or the square value of imaginary part, thereby the position at the peak-peak of obtaining (main footpath) place and the position that surpasses the place of setting, the strong footpath of threshold value.
Now, in conjunction with received signal, the strong path search that adopts sliding window is described with CMMB system-frame signal structure shown in Figure 5.
In the CMMB of embodiment of the invention system; if sample rate is 10MHz; system bandwidth is 8MHz; every frame is 1 second; per second comprises 40 time slots, and each time slot is 25 milliseconds, is made up of beacon and other effective time-domain signal; beacon is made up of the transmitter marking signal TxID of 36 microseconds and the frame synchronizing signal of 2 identical 204.8 microseconds, and protection is spaced apart 51.2 microseconds.The frame signal of each time slot then, promptly received signal comprises N=250,000 sampled point, as shown in Figure 5.Therefore, when the receiving terminal received signal performance to this embodiment system detects, need carry out corresponding strong path search to 250,000 sampled points that receive.
When adopting sliding window, need extra space at 4096, between two synchronizing signals coincide point is arranged when avoiding with machine testing, promptly can not get two complete synchronizing signals.The specific algorithm principle of the strong path search of sliding window as shown in Figure 6.
At first be that sliding window extracts, long with 4096 windows, in 2.5 * 10 of input
5Slide successively in+4096 signaling points, extract 2.5 * 10
5Individual possible long synchronizing sequence s
i (k)I=0,1 ..., 2.5 * 10
5-1, k=0,1 ..., 4095.Then be to carry out auto-correlation in the window, with each long synchronizing sequence s
i (k)Back 2048 and preceding 2048 carry out related calculation in the corresponding window:
At last, executive chairman's synchronizing sequence master footpath and strong path position detect, and calculate the mould value respectively according to following formula, auto-correlation function is real to detect, imaginary part mould value and the position of peak value, corresponding main path position, and surpass the position that sets threshold value, the position in corresponding each strong footpath.
Main path position computing formula is as follows:
Main_path＝I||real(Corr(I))|+|imag(Corr(I))|＝max{|real(Corr(i))|+|imag(Corr(i))|}，i＝0，1，......2.5×10
5-1
Each strong path position computing formula is as follows:
All_path＝I||real(Corr(I))|+|imag(Corr(I))|＝all{|real(Corr(i))|+|imag(Corr(i))|≥THRESHOLD}，i＝0，1，......2.5×10
5-1
After the strong footpath of determining corresponding received signal and main path position, can make detection to the performance that system signal receives in conjunction with Fig. 7.Fig. 7 is the detection method determining step flow chart of the embodiment of the invention.As shown in the figure, judge that at first the main path position of received signal drops in the predetermined main path position scope (step 202), if do not drop in the preset range, then illustrative system can not be synchronous, judges the receptivity abominable (step 208) of this signal.If drop in the main path position range, judge further that then the distance between main path position and all the strong path positions is positioned at protection (step 204) at interval, detect the antijamming capability of judging system at interval by protection.If drop in the protection at interval, then detect receptivity good (step 206); Otherwise, judge receptivity abominable (step 208).
For example, in conjunction with the position at synchronizing signal place in the CMMB system of the foregoing description and the frame signal thereof, the scope that can set main path position is within 4096 sampled points, and promptly the interval that protection is spaced apart 512 sampled points is set in R≤4096.If the position of judging main footpath is 4096 li of fronts in 250,000 sampled points not, judge that then system can not be synchronous, the performance that detection signal receives is abominable.Otherwise, enter the next one and judge, whether all protecting within the interval with the distance of judging main path position and all strong footpaths.That is, if the interval between main path position and the strong footpath all less than 512 sampled points, then the performance that receives of illustrative system can be satisfied the demand, and can carry out the respective channel type detection, and accurately operation such as demodulation.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, modification, replacement and modification that scope of the present invention is by claims and be equal to and limit to these embodiment.
Claims (10)
1. a method that detects signal receiving performance of digital broadcasting system is characterized in that, may further comprise the steps:
Preestablish the protection interval between the strong footpath thresholding that is used for received signal, main path position range and the adjacent reception signal;
Current received signal is searched for, exceed all strong footpaths of described predetermined strong footpath thresholding, and determine the strong path position and corresponding main path position of described current received signal with acquisition;
Whether the main path position of judging described current received signal drops in the described predetermined main path position scope; With
Judge whether the main path position and the distance between all strong path positions that drop on the described current received signal in the described predetermined main path position scope are positioned at described protection at interval, to detect the receptivity of described current demand signal.
2. detection method as claimed in claim 1 is characterized in that, described strong path search is to utilize auto-correlation in sliding window and the window.
3. detection method as claimed in claim 2 is characterized in that, according to the window length of the described sliding window of length setting of synchronizing signal in the described digit broadcasting system frame signal.
4. detection method as claimed in claim 1 is characterized in that, described default strong footpath thresholding is 1/3 of a digit broadcasting system received signal peak-peak.
5. detection method as claimed in claim 1 is characterized in that, described main path position range setting is the position according to synchronizing signal in the digit broadcasting system frame signal.
6. a device that detects signal receiving performance of digital broadcasting system is characterized in that, comprising:
Default unit is used to preestablish the protection interval between the strong footpath thresholding of received signal, main path position range and the adjacent reception signal;
Search unit is used for searching out all strong footpaths that described current received signal exceeds described predetermined strong footpath thresholding, with strong path position and the corresponding main path position of determining described current received signal;
Judging unit, be used to judge whether the main path position of described current received signal drops in the described predetermined main path position scope, and whether the main path position that drops on the described current received signal in the described predetermined main path position scope is positioned at described protection interval with the distance between all strong path positions; With
Detecting unit is used for detecting according to the judged result of described judging unit the receptivity of described current demand signal.
7. checkout gear as claimed in claim 6 is characterized in that, described search unit searches out described strong footpath according to auto-correlation in sliding window and the window.
8. checkout gear as claimed in claim 7 is characterized in that, described search unit is according to the window length of the described sliding window of length setting of synchronizing signal in the digit broadcasting system frame signal.
9. checkout gear as claimed in claim 6 is characterized in that, described default strong footpath thresholding is 1/3 of a digit broadcasting system received signal peak-peak.
10. checkout gear as claimed in claim 6 is characterized in that, described default unit is according to the described main path position range of the set positions of synchronizing signal in the digit broadcasting system frame signal.
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- 2008-11-17 CN CN200810226392A patent/CN101741480A/en active Pending
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| JP2002185423A (en) * | 2000-12-08 | 2002-06-28 | Sony Corp | Reception synchronizer and demodulator comprising it |
| CN1540910A (en) * | 2003-04-24 | 2004-10-27 | 上海明波通信技术有限公司 | Synchronization method and device of packet wireless communication system |
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