CN101841505B - Method for obtaining frame synchronization information in frame detection system with correlation characteristics - Google Patents
Method for obtaining frame synchronization information in frame detection system with correlation characteristics Download PDFInfo
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- CN101841505B CN101841505B CN200910056967A CN200910056967A CN101841505B CN 101841505 B CN101841505 B CN 101841505B CN 200910056967 A CN200910056967 A CN 200910056967A CN 200910056967 A CN200910056967 A CN 200910056967A CN 101841505 B CN101841505 B CN 101841505B
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Abstract
The invention discloses a method for obtaining frame synchronization information in a frame detection system with correlation characteristics, comprising the following steps: transmitting signals with correlation characteristics by the transmitting end of the frame detection system, and carrying out correlation calculation by the receiving end of the frame detection system through the received signals with correlation characteristics to obtain the absolute value obtained through the correlation calculation; obtaining the peak value and the mean value of the correlation values through two sliding windows in different lengths according to the absolute value, and obtaining the frame synchronization information when both the peak value and the mean value of the correlation values are more than the respective set threshold value. The method can effectively improve the accuracy and reliability of the frame detection, and is suitable for any frame detection system with correlation characteristics.
Description
Technical field
The present invention relates to the digital information transmission field, particularly relate to the method that obtains frame synchronization in a kind of frame detection system with correlation properties.
Background technology
In having the frame detection system of correlation properties, for example VSB (Vestigial Side Band residual sideband) modulating system generally all utilizes energy to detect frame synchronization.This method often adopts a sliding window, uses gross energy in the window as judgment variables then, according to the requirement of real system and the situation of noise a threshold value is set, and when judgement energy during greater than threshold value, thinks the detection of completion frame synchronization.The shortcoming that this method exists is: 1, threshold value and signal energy are closely related; 2, when interchannel noise changed greatly, it was unreliable to judge, easily noise was declared into the useful signal that transmitting terminal sends.
Summary of the invention
The technical problem that the present invention will solve provides the method that obtains frame synchronization in a kind of frame detection system with correlation properties, can effectively improve accuracy and reliability that frame detects.
For solving the problems of the technologies described above, the method that obtains frame synchronization in the frame detection system with correlation properties of the present invention is to adopt following technical scheme to realize:
Transmitting terminal by said frame detection system sends the signal with correlation properties, and the signal with correlation properties that the receiving terminal utilization of said frame detection system receives carries out related calculation, and obtains the absolute value of related operation; Obtain the peak value and the average of correlations according to described absolute value through the unequal sliding windows of two length then,, promptly think to have obtained synchronizing information when peak value and peak-to-average force ratio during simultaneously greater than the threshold value of setting separately.
The beneficial effect that method of the present invention is compared with prior art had is:
Prior art is to utilize energy to detect frame synchronization, and this method is when noise alters a great deal, and therefore the total energy value in the window also can might can become energy with noise decision greater than threshold value along with becoming big.And the present invention utilizes peak-to-average force ratio to carry out frame synchronization to detect; Because the correlation of noise is bad; The peak value of the correlation of noise and peak-to-average force ratio value are difficult to satisfy the corresponding threshold value that General System is provided with; So the reliability that method of the present invention can enhancement frame detects increases antimierophonic scope, and method of the present invention realizes also very simple.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation:
Fig. 1 is the form sketch map of EOC system frame emission;
Fig. 2 is the PN63 structure chart;
Fig. 3 is the block diagram that utilizes the peak-to-average force ratio acquisition frame synchronization of correlation of the present invention;
Fig. 4 is a process sketch map of looking for peak value;
Fig. 5 judges the process sketch map of peak-to-average force ratio greater than threshold value.
Embodiment
Because the transmitting terminal of frame detection system is in different positions with receiving terminal, for receiving terminal, need know accurately when information is come, and then handle the information that transmitting terminal is brought.Yet because the signal demand of transmitting terminal could arrive receiving terminal through complicated channel; The signal that transmitting terminal the sends noise that in channel, superposeed, in addition, even transmitting terminal does not send signal; The information that receiving terminal also might receive self-channel itself to produce, i.e. noise.Therefore, need the detection of frame, judge that it still is the effective information that transmitting terminal sends over that the information that receives is come the noise of self-channel at receiving terminal.How accurately the arrival of decision data becomes the key that frame detects.In theory, the peak-to-average force ratio of correlation (being the peak value of correlation and the ratio of average) is bigger; Based on this point, the present invention proposes a kind of peak-to-average force ratio of correlation that utilizes and accomplish the method that frame detects.This method can improve accuracy and the reliability that frame detects to a great extent.
Utilize the concrete implementation method of the peak-to-average force ratio completion frame detection of correlation to be:
Transmitting terminal by frame detection system sends the signal with correlation properties, for example known training sequence.
The signal with correlation properties that the receiving terminal utilization of frame detection system receives carries out related calculation, and obtains the absolute value of related operation; Described then absolute value obtains the peak value and the average of correlations through the unequal sliding windows of two length, when peak value and peak-to-average force ratio during simultaneously greater than the threshold value of setting separately, just thinks to have obtained frame synchronization information.
Implementing row below in conjunction with one in EOC (Ethernet Over Cable transmits ethernet frame based on the coaxial cable) system specifies:
The frame format that transmitting terminal sends is as shown in Figure 1; (training sequence has multiple promptly partly to insert known training sequence in the beginning of packet; Have plenty of one group of specific data, have plenty of the gold sequence, what also have is the data of the data copy back of front; As long as transmitting terminal sends known training sequence; Receiving terminal can both be joined with method acquisition frame synchronization of the present invention), like PN63, be convenient to receiving terminal and accomplish related operation.PN63 is a kind of training sequence at random, and the cycle is 63, is produced by multinomial g (x)=x^6+x^1+1, and its implementation structure does not have the square frame representative of literal to postpone referring to shown in Figure 2 among the figure, and the value when initial from left to right is a Binary Zero 00001.
In conjunction with shown in Figure 3, the process that receiving terminal utilizes the peak-to-average force ratio of correlation to carry out the frame detection is:
(a), after training sequence PN63 that receiving terminal is known with the baseband signal that receives and transmitting terminal through length is correlator and the delivery square of N (N equals 63 in the EOC system), the absolute value of acquisition known training sequence correlation energy is designated as X.
(b), the absolute value X of correlation energy through energy sliding window P (energy sliding window P window length be N, N equals 63 in the EOC system), try to achieve the summation of correlation energy absolute value, be made as Y.
(c), the absolute value process peak value sliding window M of while correlation energy is (because the correlation before and after the peak value is very big; So length m of the window of peak value sliding window M; M is 3 in the EOC system), be used for asking the peak value of the absolute value of correlation energy, the output of peak value sliding window M is designated as Z.
(d), through the maximum that postpones and relatively selector is found out peak energy.The concrete method that realizes compares the output Z signal of peak value sliding window M and the signal P (being the maximum of peak energy) of a timeticks of delay referring to shown in Figure 4; If the value of signal Z is greater than the value of signal P (comparator as shown in Figure 4, as a during greater than b, c equals 1, otherwise c equals 0), selector mux output signal Z, otherwise the output signal of selector mux is P.Through such comparing repeatedly and selection, finally find maximum, and keep this maximum from the output signal Z of peak value sliding window M.Promptly when the peak value of the absolute value of correlation energy arrived, maximum appearred in signal Z; At this moment, selector mux is output as peak signal; In the time period after the peak value, the output of signal P goes out the output valve of the selector mux of now always for the absolute value peak value of correlation energy, promptly find out the maximum of peak energy and keep this maximum.
(e), judge that whether peak-to-average force ratio is greater than preset threshold.Referring to shown in Figure 5, after peak signal P deducts peak signal P and multiply by the signal (referring to following formula 1) of parameter k greater than the summation Y of correlation energy absolute value, think that then peak-to-average force ratio is greater than preset threshold 2.Concrete according to referring to following formula:
P＞(y-p) * k (formula 1)
P * (1+k)＞y * k (formula 2)
(p/y)＞k/ (1+k) (formula 3)
(p/ (y/63))＞(63 * k)/(1+k) (formula 4)
Y/63 representes average in the formula 4; The ratio of (p/ (y/63)) expression peak value and average; Formula 4 is promptly represented peak-to-average force ratio greater than threshold value 2, the size of threshold value 2 be (63 * k)/(1+k), in practical application; K can change according to the length of the training sequence of system, and the value of k is 0.1875 under normal conditions.
Can find out that according to above-mentioned formula formula 1 is equivalent to formula 2, can derive formula 3 by formula 2; Can derive formula 4 by formula 3; Therefore formula 1 is equivalent to formula 4.When formula 1 condition was met, the condition of formula 4 was also just satisfied, and promptly when the condition of formula 1 is met, thought that just peak-to-average force ratio is greater than threshold value 2; The purpose of doing like this is that hardware avoids the use of divider when realizing, thereby makes that realization is simpler.
(f), when peak-to-average force ratio greater than a certain threshold value, and the energy of peak value P is simultaneously under the condition greater than threshold value 1, thinks then that frame detects to accomplish.Think that promptly detected information is useful signal information rather than noise.
Method of the present invention can be used in any frame detection system with correlation properties, like the VSB modulating system, and the 802.16d system.
More than through specific embodiment the present invention has been carried out detailed explanation, but these are not to be construed as limiting the invention.Under the situation that does not break away from the principle of the invention, those skilled in the art also can make many distortion and improvement, and these also should be regarded as protection scope of the present invention.
Claims (4)
1. obtain the method for frame synchronization in the frame detection system with correlation properties; It is characterized in that: the transmitting terminal by said frame detection system sends the signal with correlation properties; The signal with correlation properties that the receiving terminal utilization of said frame detection system receives carries out related calculation, and obtains the absolute value of related operation; Obtain the peak value and the average of correlations according to described absolute value through the unequal sliding windows of two length then,, promptly think to have obtained synchronizing information when peak value and peak-to-average force ratio during simultaneously greater than the threshold value of setting separately;
The method of the average of said acquisition correlation is, is the energy sliding window of N with said absolute value through length, tries to achieve correlation energy average absolute; Wherein the length of N equals the length of transmitting terminal training sequence;
The method of the peak value of said acquisition correlation is, is the peak value sliding window of m with said absolute value through length, asks the peak value of the absolute value of correlation energy, and the output of peak value sliding window is designated as Z;
And then through the maximum that postpones and relatively selector is found out peak energy; The output signal Z of peak value sliding window is compared with the signal P that postpones a timeticks; If the value of signal Z is greater than the value of signal P, then selector is exported signal Z, otherwise the output signal of selector is P; Through comparing repeatedly and selecting, finally find maximum, and keep this maximum from the output signal Z of peak value sliding window.
2. the method for claim 1, it is characterized in that: said signal with correlation properties is a known training sequence.
3. the method for claim 1; It is characterized in that: the method for the absolute value of said acquisition related operation is: after receiving terminal training sequence that the baseband signal that receives and transmitting terminal is known is correlator and the delivery square of N through length; Obtain the absolute value of known training sequence correlation energy, wherein the length of N equals the length of transmitting terminal training sequence.
4. the method for claim 1 is characterized in that: whether peak-to-average force ratio is judged according to following formula greater than preset threshold:
p＞(y-p)×k
Wherein, p is a peak signal, and y is the summation of correlation energy absolute value, and k is a constant; Promptly after peak signal p deducts the signal of peak signal p and multiplication by constants k greater than the summation y of correlation energy absolute value, think that then peak-to-average force ratio is greater than preset threshold.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103152815B (en) * | 2011-12-07 | 2015-06-17 | 福建联拓科技有限公司 | Improved digital private mobile radio (dPMR) delay access method and device |
| CN106209298B (en) * | 2015-04-29 | 2019-08-06 | 扬智科技股份有限公司 | Peak computational method and apparatus and the preamble detecting method for using this method |
| CN106209322B (en) | 2016-07-18 | 2019-12-20 | 浙江大华技术股份有限公司 | Method and device for hybrid data transmission in video signal |
| CN106603131A (en) * | 2017-01-31 | 2017-04-26 | 东南大学 | Frame synchronization method for MIMO system |
| CN109714146B (en) * | 2018-01-16 | 2020-05-12 | 电子科技大学 | Sliding window-based quadratic correlation frame synchronization method |
| CN108880661B (en) * | 2018-07-02 | 2020-09-04 | 成都国恒空间技术工程有限公司 | Incoherent threshold decision frame synchronization method, device and readable storage medium thereof |
| CN108848526B (en) * | 2018-08-02 | 2021-07-06 | 武汉虹信科技发展有限责任公司 | PUSCH-based field intensity measurement equipment and method in TD-LTE |
| CN114362839B (en) * | 2021-12-07 | 2024-05-03 | 芯象半导体科技(北京)有限公司 | Signal detection method and device based on HPLC dual-mode wireless system and electronic equipment |
| CN114826331A (en) * | 2022-04-22 | 2022-07-29 | 青岛鼎信通讯股份有限公司 | Low-voltage line carrier communication signal multipath time delay characteristic test method |
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| CN2824438Y (en) * | 2004-12-09 | 2006-10-04 | 北京天碁科技有限公司 | Frame synchronous code detector |
| CN101141142A (en) * | 2007-08-09 | 2008-03-12 | 中兴通讯股份有限公司 | Method to reduce leakage checking of uplink synchronous detection |
| EP1976212A1 (en) * | 2004-01-08 | 2008-10-01 | Qualcomm Incorporated | Frame synchronization in an OFDM system |
| CN101291511A (en) * | 2008-06-11 | 2008-10-22 | 北京邮电大学 | Carrier detecting method for downlink signal of TD-SCDMA |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1976212A1 (en) * | 2004-01-08 | 2008-10-01 | Qualcomm Incorporated | Frame synchronization in an OFDM system |
| CN2824438Y (en) * | 2004-12-09 | 2006-10-04 | 北京天碁科技有限公司 | Frame synchronous code detector |
| CN101141142A (en) * | 2007-08-09 | 2008-03-12 | 中兴通讯股份有限公司 | Method to reduce leakage checking of uplink synchronous detection |
| CN101291511A (en) * | 2008-06-11 | 2008-10-22 | 北京邮电大学 | Carrier detecting method for downlink signal of TD-SCDMA |
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