CN101478818B - Method and apparatus for determining synchronization position - Google Patents

Abstract

Embodiments of the present invention provide a method and a device for determining a synchronization position, which relate to the communication field; and solve the problem in the prior art that the adjustment amount of the synchronization position obtained is inaccurate based on a common burst signal carrying an interference signal. The method for determining the synchronization position includes: selecting a set of training sequences with a delay of zero and at least one pair of training sequences with equal delays from a common burst signal; filtering the training sequences to obtain the filtered training sequence: acquiring the instantaneous error of the training sequence selected from the common burst signal according to the filtered training sequence; adjusting the synchronization position of the common burst signal according to the instantaneous error. The technical solution provided by the embodiment of the present invention can be applied to obtain the synchronization position of the signal.

Description

Method and device for determining synchronous position

technical field

The invention relates to a communication system, in particular to a method and a device for adjusting the extraction position of a training sequence. the

Background technique

In the Global System for Mobile communication (GSM, Global System for Mobile communication), in the process of demodulating the ordinary burst signal, the receiver obtains the synchronous position (TOA, Time of arrival, also known as the signal arrival time) of the ordinary burst signal, according to The synchronization position of the normal burst signal demodulates the normal burst signal. the

When obtaining the synchronous position of common burst signal, due to the influence of crystal oscillator drift and signal multipath change, the synchronous position of current common burst signal is different from that of the previous common burst signal. In the (NB, Normal Burst) demodulation, the current normal burst signal is demodulated according to the synchronization position of the previous normal burst signal, which causes the problem that the demodulation of the current normal burst signal is inaccurate. The prior art provides a method for determining the synchronization position of an ordinary burst signal, comprising: reading a search window whose length is 28 consecutive symbols from the ordinary burst signal, and combining the 28 symbols in the search window with The 16 symbols in the local training sequence are shifted and correlated, and a set of correlation values are obtained according to the correlation algorithm to determine the adjustment amount of the synchronization position of the common burst signal. The synchronization position of the normal burst signal is determined by adjusting the synchronization position of the current normal burst signal according to the determined adjustment amount of the synchronization position of the normal burst signal. the

In the process of implementing the present invention, the inventors have found at least the following problems in the prior art: when the working environment of the receiver is a strong interference environment, there are strong interference signals in the common burst signals acquired by the receiver. Carrying the shift correlation of the ordinary burst signal with a strong interference signal, the determined synchronization position of the ordinary burst signal will be inaccurate, thereby increasing the error of the demodulation of the ordinary burst signal by the receiver, or even The receiver will be out of sync and unable to work due to the continuous deviation of the synchronous position to the same direction. the

Contents of the invention

Embodiments of the present invention provide a method and device for demodulating a signal, capable of obtaining an accurate value of a synchronization position adjustment amount of a common burst signal. the

A method of determining a synchronization location, comprising:

Select a training sequence with zero delay and at least one pair of training sequences with equal delay from the common burst signal;

Perform filtering processing on the training sequence to obtain the filtered training sequence;

Acquiring the instantaneous error of the training sequence selected from the common burst signal according to the filtered training sequence, where the instantaneous error is the difference between the filtered training sequence and the selected training sequence;

The synchronization position of the normal burst signal is adjusted according to the instantaneous error. the

A device for determining a synchronized position, comprising:

The training sequence selection module is used to select a training sequence with zero delay and at least one pair of training sequences with equal delay from ordinary burst signals;

A filtering module, configured to filter the training sequence selected by the training sequence selection module to obtain a filtered training sequence;

The instantaneous error acquisition module is used to obtain the instantaneous error of the training sequence selected from the common burst signal according to the filtered training sequence obtained by the filtering module, and the instantaneous error is the filtered training sequence and The difference of the selected training sequence;

The synchronous position adjustment module is configured to adjust the synchronous position of the normal burst signal according to the instantaneous error acquired by the instantaneous error acquisition module. the

The method and device for determining the synchronization position provided by the embodiments of the present invention perform filtering processing on the common burst signal, and obtain the synchronization position of the common burst signal after eliminating the interference signal in the common burst signal, so as to overcome the conventional For common burst signals carrying interference signals, the acquired normal burst signal synchronization position adjustment is inaccurate, which ensures the accuracy of the normal burst signal synchronization position, thereby reducing the receiver's ability to demodulate the normal burst signals. error. the

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort. the

Fig. 1 is the flow chart of the method for determining synchronous position that the embodiment of the present invention provides;

Fig. 2 is the flow chart of the method for determining synchronous position that another embodiment of the present invention provides;

Fig. 3 is the schematic diagram of common burst signal in the prior art;

Fig. 4 is the flowchart of the method for determining the synchronous position that another embodiment of the present invention provides;

Fig. 5 is the flowchart of the method for determining synchronous position that another embodiment of the present invention provides;

Fig. 6 is a schematic structural diagram of a device for determining a synchronization position provided by an embodiment of the present invention;

Fig. 7 is a schematic structural diagram of a device for determining a synchronization position provided by another embodiment of the present invention;

Fig. 8 is the schematic diagram of synchronous position determining module in Fig. 7;

Fig. 9 is another schematic diagram of the synchronization position determination module in Fig. 7;

FIG. 10 is a schematic diagram of the target adjustment amount determination sub-module in FIG. 9 . the

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. the

The present invention will be further explained below in conjunction with specific embodiments and accompanying drawings. the

In order to accurately adjust the synchronization position of ordinary burst signals, the embodiment of the present invention provides a method for determining the synchronization position, as shown in Figure 1, including:

S101. Select a group of training sequences with zero delay and at least one pair of training sequences with equal delay from the common burst signal;

The pair of training sequences with equal delays are training sequences with delays of +n and -n. the

S102. Perform filtering processing on the training sequence to obtain a filtered training sequence;

S103. Acquire the instantaneous error of the training sequence selected from the common burst signal according to the filtered training sequence;

The instantaneous error is the difference between the filtered training sequence and the selected training sequence. the

S104. Adjust the synchronization position of the normal burst signal according to the instantaneous error. the

The method for determining the synchronization position provided by the embodiment of the present invention performs filtering processing on the ordinary burst signal, eliminates the interference signal in the ordinary burst signal, obtains the synchronization position of the ordinary burst signal after the interference signal is eliminated, and overcomes the problems in the prior art. According to the ordinary burst signal carrying the interference signal, the obtained ordinary burst signal synchronization position adjustment amount is inaccurate, which ensures the accuracy of the ordinary burst signal synchronization position, thereby reducing the frequency of receiver demodulation of the ordinary burst signal. signal error. the

As shown in Figure 2, another embodiment of the present invention also provides a method for determining the synchronization position, the specific process is as follows:

S201. Select a group of training sequences with zero delay and at least one pair of training sequences with equal delay from the common burst signal;

Specifically, the training sequence in the Normal Burst (NB, Normal Burst) signal is selected as a sequence with zero delay, and the schematic diagram of the NB signal is shown in FIG. 3 . And select at least a pair of training sequences with equal delays from the training sequences, that is, training sequences with delays of +n and -n, where n∈R but n≠0. the

In this embodiment of the present invention, the continuous sequence of the training sequence from the 62nd symbol to the 87th symbol of the NB signal is used as an example for illustration, but it is not limited to this. In practical applications, some symbols can be selected from the above training sequence to form the training sequence. sequence. the

S202. Perform filtering processing on the training sequence to obtain a filtered training sequence;

Specifically, the methods for filtering the training sequence in the prior art are applicable to this step, which will not be repeated here. the

S203. Acquire the instantaneous error of the training sequence selected from the common burst signal according to the filtered training sequence;

Wherein the instantaneous error is the difference between the filtered training sequence and the training sequence

Specifically, the instantaneous error e(j)=y(j)-c ^H x(j), where y(j) is the desired signal, that is, the local training sequence, c is the filter coefficient, and c ^H is the filter coefficient The transpose of c, x(j) is the training sequence, and c ^H x(j) is the filtered training sequence.

S204. Determine the adjustment amount of the synchronization position of the ordinary burst signal according to the instantaneous error;

Specifically, the embodiment of the present invention is described by taking recursive least square (RLS, Recursive least square) interference cancellation as an example. the

Substituting the instantaneous error of each training sequence into the following cost function to obtain the minimum value E _min of the cost function;

cost function $\mathrm{E.}\left(\mathrm{no}\right)=\underset{j=0}{\overset{\mathrm{no}}{\mathrm{\Σ}}}{\mathrm{\λ}}^{\mathrm{no}-j}{\left|e\left(j\right)\right|}^2=\underset{j=0}{\overset{\mathrm{no}}{\mathrm{\Σ}}}{\mathrm{\λ}}^{\mathrm{no}-j}{|\mathrm{the\; y}\left(j\right)-c^{h}x\left(j\right)|}^2---\left(1\right)$

Among them, λ is the forgetting factor, e(j) is the instantaneous error, n is the number of symbols in the training sequence, y(j) is the expected signal, that is, the local training sequence, c is the filter coefficient, c ^H is the filter coefficient c , x(j) is the training sequence, and c ^H x(j) is the filtered training sequence.

From the above formula (1), it can be deduced that the minimum value E _min of E(n) is:

${\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; min</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; the\; y</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span>\stackrel{<span\; class="notranslate">\; ^</span>}{\mathrm{<span\; class="notranslate">\; d</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; c</span>}}^{\mathrm{<span\; class="notranslate">\; h</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

in ${\mathrm{E.}}_{\mathrm{the\; y}}\left(\mathrm{no}\right)=\underset{j=0}{\overset{\mathrm{no}}{\mathrm{\&Sigma;}}}{\mathrm{\&lambda;}}^{\mathrm{no}-j}{\left|\mathrm{the\; y}\left(j\right)\right|}^2,$ $\hat{d}\left(\mathrm{no}\right)=\underset{j=0}{\overset{\mathrm{no}}{\mathrm{\&Sigma;}}}{\mathrm{\&lambda;}}^{\mathrm{no}-j}x\left(j\right){\mathrm{the\; y}}^{*}\left(j\right),$

E _y (n) is the weighted energy value of the desired signal;

为输入信号与期望信号相关值的加权和值； 

is the weighted sum of the input signal and the correlation value of the desired signal;

y ^* (j) is the conjugate value of y(j);

c(n) is the value of the filter coefficient c that makes E(n) the smallest in formula (1), and c ^H (n) is the transposition of c(n);

From the above formula (2), it can be deduced that E _min (n) is:

E _min (n)=λE _min (n-1)+[y(n)-c ^H (n)x(n)]e ^* (n) where e ^* (n) is the conjugate of e(j).

In the minimum value E _min of the cost function of each training sequence, select a training sequence with the smallest E _min value. Obtain the normal burst signal synchronization position adjustment amount corresponding to the training sequence with the smallest E _min value, and determine the acquired normal burst signal synchronization position adjustment amount as the normal burst signal synchronization position adjustment value.

When determining the normal burst signal synchronization position adjustment amount, the normal burst signal synchronization position adjustment value corresponding to each training sequence needs to be set in advance. the

For example, the delay of each training sequence is set as the normal burst signal synchronization position adjustment amount, that is, the normal burst signal synchronization position adjustment value corresponding to the training sequence with a delay of -n is -n. But not limited thereto, the value of the synchronization position adjustment amount can be adjusted according to actual application conditions. the

S205. Adjust the synchronization position of the normal burst signal according to the determined adjustment amount of the synchronization position of the normal burst signal. the

Specifically, the synchronization position of the current normal burst signal is adjusted according to the determined normal burst signal synchronization position adjustment amount. If the normal burst signal synchronization adjustment amount is a negative value, adjust the synchronization position of the current normal burst signal forward; if it is a positive value, adjust the synchronization position of the current normal burst signal backward; If it is zero, the synchronization position of the current ordinary burst signal is not adjusted; the adjusted time length is the absolute value of the adjustment amount of the synchronization position of the ordinary burst signal. the

The method for determining the synchronization position provided by the embodiment of the present invention performs filtering processing on the common burst signal, and after eliminating the interference signal in the common burst signal, obtains the synchronization position of the normal burst signal after the interference signal is eliminated, overcoming the existing According to the ordinary burst signal carrying the interference signal in the technology, the obtained ordinary burst signal synchronization position adjustment is inaccurate, which ensures the accuracy of the ordinary burst signal synchronization position, thereby reducing the receiver demodulation of the ordinary burst signal. Burst signal error. the

As shown in Figure 4, another embodiment of the present invention also provides a method for determining the synchronization position, the specific process is as follows:

The method provided by the embodiment of the present invention is similar to the above method, except that before filtering the training sequence, filter parameters for filtering the training sequence are set according to the characteristics of signal multipath transmission conditions. Filtering is performed on the training sequence according to the filtering parameters of the training sequence, and the specific implementation is similar to the above method, which will not be repeated here. After the synchronization position of the normal burst signal is determined, when the normal burst signal is demodulated, the filter parameter of the filtering process can be set again, and the normal burst signal can be processed according to the filter coefficient set again. to demodulate. the

For example, taking the RLS adaptive filtering process as an example, when obtaining the synchronization position adjustment amount of the common burst signal, when performing the RLS filtering process on the training sequence of the common burst signal, the feedforward during RLS filtering is set The number of symbols q=4. In the process of demodulating the normal burst signal, when RLS filtering is performed on the normal burst signal, the number of feed-forward symbols in RLS filtering is set to q=2. the

In the method for determining the synchronization position provided by the embodiment of the present invention, after eliminating the interference signal in the ordinary burst signal, the adjustment amount of the synchronization position of the ordinary burst signal is obtained, which overcomes the problem in the prior art based on the ordinary burst signal carrying the interference signal. , the problem of inaccurate adjustment amount of the acquired normal burst signal synchronization position ensures the accuracy of the normal burst signal synchronization position, thereby reducing the error of the demodulation of the normal burst signal by the receiver. According to the characteristics of signal multi-path transmission conditions, the filter coefficients for obtaining synchronization position and demodulation signal are set separately, so that the receiver can obtain accurate synchronization position and demodulation performance at the same time. the

As shown in Figure 5, another embodiment of the present invention also provides a method for determining the synchronization position, the specific process is as follows:

The embodiment of the present invention is the same as the above method, the difference is that after determining the synchronization position adjustment amount of the normal burst signal, record the synchronization position adjustment value of the normal burst signal, and obtain the next normal burst signal, and loop The above-mentioned process of acquiring the synchronization position adjustments is performed until the number of recorded synchronization position adjustments reaches a preset threshold. When the number of synchronous position adjustments reaches the preset threshold, the at least two synchronous position adjustments are superimposed, and the superimposed total synchronous position adjustment is determined as the target adjustment of the common burst signal synchronous position quantity. The synchronization position of the normal burst signal is adjusted according to the target adjustment amount of the normal burst signal synchronization position. the

In the embodiment of the present invention, the threshold of the number of adjustments may be a fixed value, or the threshold of the number of adjustments may be adaptively adjusted according to remaining conditions of system resources. the

Optionally, in order to further reduce the number of adjustments of the normal burst signal synchronization position, the superimposed normal burst signal synchronization position adjustment amount can be compared with a preset threshold value of the synchronization position adjustment amount, and the normal burst signal can be determined according to the comparison result. The target adjustment amount for the sync position of the burst. the

Specifically, a threshold TOA_Threshold of the synchronization adjustment amount is set, where TOA_Threshold>0. the

When the adjustment amount of the synchronization position of the superimposed ordinary burst signal is greater than the threshold of the synchronization adjustment amount, that is, when TOA_SUM>TOA_Threshold, it is determined that the target adjustment direction of the synchronization position of the ordinary burst signal is backward adjustment;

When the adjustment amount of the synchronization position of the superimposed ordinary burst signal is less than the opposite number of the threshold of the synchronization adjustment amount, that is, when TOA_SUM<-TOA_Threshold, it is determined that the target adjustment direction of the synchronization position of the ordinary burst signal is toward pre-adjustment;

When the adjustment amount of the synchronization position of the superimposed normal burst signal is between the above two thresholds, ie - TOA_Threshold<TOA_SUM<TOA_Threshold, the synchronization position of the normal burst signal is not adjusted. the

The duration of the target adjustment amount is the sum of the values of the adjustment amounts of the at least two synchronization positions. the

It should be noted that, the superimposition of the adjustment amounts of the at least two synchronous positions may be the superposition of the numerical values of the adjustment amounts, or the superposition of the adjustment directions. Wherein the superposition of the value of the adjustment amount is to obtain the sum of the adjustment amounts of the at least two synchronous positions, and the superposition of the adjustment direction is the adjustment direction according to the adjustment amounts of the at least two synchronous positions, that is, forward adjustment and backward adjustment. The number of adjustments determines the adjustment direction of the target adjustment amount. According to different types of the synchronization position adjustment, the threshold of the synchronization position adjustment can be set to different values. the

The method for determining the synchronization position provided by the embodiment of the present invention performs filtering processing on the common burst signal, and after eliminating the interference signal in the common burst signal, obtains the synchronization position of the normal burst signal after the interference signal is eliminated, overcoming the existing According to the ordinary burst signal carrying the interference signal in the technology, the obtained ordinary burst signal synchronization position adjustment is inaccurate, which ensures the accuracy of the ordinary burst signal synchronization position, thereby reducing the receiver demodulation of the ordinary burst signal. Burst signal error. According to the characteristics of signal multi-path transmission conditions, the filter coefficients for obtaining synchronization position and demodulation signal are set separately, so that the receiver can obtain accurate synchronization position and demodulation performance at the same time. Within a certain period of time, according to the total adjustment amount after the synchronous position adjustment of at least two ordinary burst signals is superimposed, adjust the synchronous position of the ordinary burst signal, eliminate the influence of noise in the ordinary burst signal, and increase the adjustment time interval, reducing the number of times to adjust the synchronization position and saving system resources. the

The above embodiments of the present invention take RLS adaptive filtering as an example for illustration, but are not limited thereto, and are also applicable to other adaptive filtering methods. Since the methods and processes are similar, details will not be repeated here. the

As shown in Figure 6, an embodiment of the present invention provides a device for determining a synchronization position, including:

The training sequence selection module 601 is used to select a group of training sequences whose delay is zero and at least one pair of training sequences whose delay is equal from the common burst signal;

The filtering module 602 is used to filter the training sequence selected by the training sequence selection module 601, and obtain the filtered training sequence;

The instantaneous error acquisition module 603 is used to obtain the instantaneous error of the training sequence selected from the common burst signal according to the filtered training sequence obtained by the filtering module 602;

The synchronization position adjustment module 604 is configured to adjust the synchronization position of the normal burst signal according to the instantaneous error acquired by the instantaneous error acquisition module 603 . the

In order to enable the receiver to simultaneously obtain an accurate synchronization position and a demodulation error demodulation signal, the device for determining the synchronization position further includes:

The filtering parameter setting module 605 is configured to set filtering parameters for filtering the training sequence before the filtering module 602 acquires the filtered training sequence. the

As shown in Figure 8, further, the synchronization position adjustment module 604 includes:

The instantaneous error sum of squares acquisition submodule 801 is used to obtain the sum of squares of the instantaneous error of the training sequence according to the instantaneous error of each group of training sequences;

The adjustment amount determination submodule 802 is used to select the training sequence with the smallest square sum of instantaneous errors, and obtain the normal burst signal synchronization position adjustment amount corresponding to the selected training sequence, and obtain the normal burst signal synchronization position adjustment amount Determine the synchronization position adjustment amount for the common burst signal;

The synchronization position adjustment sub-module 803 is configured to adjust the synchronization position of the normal burst signal according to the normal burst signal synchronization position adjustment amount determined by the adjustment amount determination sub-module 802 . the

Optionally, as shown in Figure 9, in order to reduce the number of adjustments of the synchronization position of ordinary burst signals and save system resources, the synchronization position adjustment module 604 also includes:

The target adjustment amount determination sub-module 804 is configured to superimpose the at least two ordinary burst signal synchronization position adjustment amounts when there are at least two ordinary burst signal synchronization position adjustment amounts, and according to the superimposed ordinary burst signal The signal synchronization position adjustment amount is to obtain the target adjustment amount of the common burst signal synchronization position. the

As shown in Figure 10, wherein said target adjustment amount determination submodule 704 includes:

The adjustment amount threshold comparison unit 1001 is configured to superimpose the at least two ordinary burst signal synchronization position adjustment amounts, and compare the superimposed ordinary burst signal synchronization position adjustment amount with the preset ordinary burst signal synchronization position adjustment amount threshold comparison;

The target adjustment amount determination unit 1002 is used for determining the target adjustment amount of the normal burst signal synchronization position based on the comparison result of the adjustment amount threshold comparison unit 1001 . the

In combination with the method provided by the embodiment of the present invention, the device for determining the synchronization position provided by the embodiment of the present invention is introduced in detail:

The training sequence selection module 601 selects a group of training sequences with a delay of zero and at least one pair of training sequences with equal delays from the common burst signal; wherein the at least one pair of training sequences with equal delays has a delay of +n and -n training sequences, where n ∈ R but n ≠ 0. the

The filtering module 602 performs filtering processing on the training sequence selected by the training sequence selection module 601 to obtain the filtered training sequence. the

According to the filtered training sequence obtained by the filtering module 602, the instantaneous error obtaining module 603 obtains the instantaneous error of the training sequence selected from the common burst signal; wherein the instantaneous error is the filtered training sequence and the Difference of the training sequence. the

According to the instantaneous error acquired by the instantaneous error acquisition module, the synchronization position adjustment module 604 adjusts the synchronization position of the ordinary burst signal. the

Specifically, according to the instantaneous error of each group of training sequences, the instantaneous error sum of squares acquisition submodule 801 obtains the sum of squares of the instantaneous errors of the training sequence; the adjustment amount determination submodule 802 selects the training sequence with the smallest sum of squares of instantaneous errors, and Obtain the normal burst signal synchronization position adjustment corresponding to the selected training sequence, and determine the normal burst signal synchronization position adjustment as the normal burst signal synchronization position adjustment; wherein the delay setting of each training sequence is the normal burst signal synchronization position adjustment amount, that is, the normal burst signal synchronization position adjustment value corresponding to the training sequence with a delay of -n is -n. But not limited thereto, the value of the synchronization position adjustment amount can be adjusted according to actual application conditions. According to the normal burst signal synchronization position adjustment amount determined by the adjustment amount determination sub-module 802, the synchronization position adjustment sub-module 803 adjusts the synchronization position of the normal burst signal. When the normal burst signal synchronization adjustment amount is a negative value, the synchronization position of the current normal burst signal is adjusted forward, otherwise, the synchronization position of the current normal burst signal is adjusted backward. The adjusted time length is the absolute value of the normal burst signal synchronization position adjustment amount. the

Optionally, before the filtering module 602 performs filtering processing on the training sequence, the filtering parameter setting module 605 sets filtering parameters for filtering the training sequence according to the operation conditions of the channel transmitting the normal burst signal. According to the filtering parameters of the training sequence, the filtering module 602 performs filtering processing on the training sequence. the

Further, after the adjustment amount determination submodule 802 determines the synchronization position adjustment amount of the normal burst signal, the target adjustment amount determination submodule 804 records the synchronization position adjustment amount of the normal burst signal, and obtains the next normal burst signal Send a signal, and cycle the above-mentioned process of obtaining the synchronous position adjustment until the number of recorded synchronous position adjustments reaches the preset threshold. When the number of synchronous position adjustments reaches the preset threshold, the target adjustment submodule 804 superimposes the at least two synchronous position adjustments, and determines the superimposed total synchronous position adjustments as the normal outlier Signals the target adjustment for the sync position. According to the target adjustment amount of the synchronization position of the normal burst signal, the synchronization position adjustment sub-module 803 adjusts the synchronization position of the normal burst signal. After the synchronization position of the normal burst signal is adjusted, the normal burst signal is demodulated. the

In order to further reduce the number of adjustments of the common burst signal synchronization position, the adjustment value threshold comparison unit 1001 compares the superimposed common burst signal synchronization position adjustment value with the preset threshold value of the synchronization position adjustment value, and according to the comparison result, the target adjustment value The determining unit 1002 determines the target adjustment amount of the synchronization position of the common burst signal. the

Specifically, the adjustment amount threshold comparison unit 1001 sets the threshold value TOA_Threshold of the synchronization adjustment amount, wherein TOA_Threshold>0, when the synchronization position of the superimposed ordinary burst signal is greater than the threshold value of the synchronization adjustment amount, that is, TOA_SUM>TOA_Threshold, then The target adjustment amount determination unit 1002 determines that the target adjustment direction of the synchronization position of the ordinary burst signal is backward adjustment, and the adjustment amount is the duration of TOA_SUM. When the synchronization position of the superimposed ordinary burst signal is less than the threshold value of the synchronization adjustment amount when TOA_SUM<-TOA_Threshold, then the target adjustment amount determining unit 1002 determines that the target adjustment direction of the synchronization position of the ordinary burst signal is forward adjustment, and the adjustment amount is the duration of TOA_SUM, when -TOA_Threshold<TOA_SUM< TOA_Threshold, the target adjustment amount determining unit 1002 does not adjust the synchronization position of the normal burst signal. the

The device for determining the synchronization position provided by the embodiment of the present invention performs filtering processing on the ordinary burst signal, and obtains the synchronization position of the ordinary burst signal after the interference signal is eliminated after eliminating the interference signal in the ordinary burst signal, overcoming the existing In the technology, according to the common burst signal carrying the interference signal, the obtained normal burst signal synchronization position adjustment is inaccurate, which ensures the accuracy of the normal burst signal synchronization position, thereby reducing the receiver demodulation. The error of a normal burst signal. the

Those of ordinary skill in the art can understand that all or part of the steps carried by the methods of the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, and the program can be executed when executed , including one or a combination of the steps of the method embodiment. the

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing module, each unit may exist separately physically, or two or more units may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware or in the form of software function modules. If the integrated modules are realized in the form of software function modules and sold or used as independent products, they can also be stored in a computer-readable storage medium. the

The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, and the like. the

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims. the

Claims (11)

1. the method for a definite sync bit is characterized in that, comprising:

Choosing retardation from the normal burst signal is zero training sequence and the equal training sequence of at least one pair of retardation;

Described training sequence is carried out Filtering Processing, obtain filtered training sequence;

According to described filtered training sequence, obtain the instantaneous error of the described training sequence of from the normal burst signal, choosing, described instantaneous error is the difference of described filtered training sequence and the described training sequence of choosing;

Adjust the sync bit of described normal burst signal according to described instantaneous error.

2. the method for definite sync bit according to claim 1 is characterized in that, also comprises: the filtering parameter that described training sequence is carried out Filtering Processing is set.

3. the method for definite sync bit according to claim 1 is characterized in that, the described sync bit of adjusting described normal burst signal according to described instantaneous error comprises:

According to the instantaneous error of every group of training sequence, obtain the quadratic sum of the instantaneous error of described every group of training sequence;

Choose the training sequence of the quadratic sum minimum of instantaneous error, and obtain the sync bit adjustment amount of the described training sequence correspondence of choosing, the sync bit adjustment amount that obtains is defined as described normal burst signal Synchronization position adjustment amount;

According to described normal burst signal Synchronization position adjustment amount, adjust the sync bit of described normal burst signal; When if described normal burst signal Synchronization adjustment amount is negative value, then adjust the sync bit of described current normal burst signal forward; If be on the occasion of the time, adjust the sync bit of described current normal burst signal backward; If when being zero, do not adjust the sync bit of described current normal burst signal; Wherein the time span of Tiao Zhenging is the absolute value of normal burst signal Synchronization position adjustment amount.

4. the method for definite sync bit according to claim 3 is characterized in that, the normal burst signal Synchronization position adjustment amount of described training sequence correspondence is the delay of described normal burst signal.

5. the method for definite sync bit according to claim 3 is characterized in that, when the sync bit adjustment amount of the normal burst signal of determining according at least two normal burst signals during at least two, also comprises:

With described at least two normal burst signal Synchronization position adjustment amounts stack, the normal burst signal Synchronization position adjustment amount according to after the stack obtains the target adjustment amount of described normal burst signal Synchronization position.

6. the method for definite sync bit according to claim 5, it is characterized in that, described with at least two normal burst signal Synchronization position adjustment amounts stacks, according to the normal burst signal Synchronization position adjustment amount after the stack, the target adjustment amount that obtains described normal burst signal Synchronization position comprises:

With described at least two normal burst signal Synchronization position adjustment amounts stack, with the threshold ratio of the normal burst signal Synchronization position adjustment amount after the stack and default normal burst signal Synchronization position adjustment amount, according to comparative result, determine the target adjustment amount of described normal burst signal Synchronization position; If the adjustment amount of the sync bit of the normal burst signal after the stack during greater than the threshold value of described sync bit adjustment amount, is then determined the target of described normal burst signal Synchronization position and is adjusted direction and be adjustment backward; If the adjustment amount of the sync bit of the normal burst signal after the stack during less than the opposite number of the threshold value of described sync bit adjustment amount, is then determined the target of described normal burst signal Synchronization position and is adjusted direction and be adjustment forward; If the adjustment amount of the sync bit of the normal burst signal after the stack is between the opposite number of the threshold value of the threshold value of described sync bit adjustment amount and described sync bit adjustment amount the time, then do not adjust described normal burst signal Synchronization position, wherein, the threshold value of described sync bit adjustment amount is greater than zero; The adjustment duration of described target adjustment amount is the absolute value of the sync bit adjustment amount of the normal burst signal after the described stack.

7. the device of a definite sync bit is characterized in that, comprising:

Training sequence is chosen module, and being used for choosing retardation from the normal burst signal is zero training sequence and the equal training sequence of at least one pair of retardation;

Filtration module is used for that described training sequence is chosen the training sequence that module chooses and carries out Filtering Processing, obtains filtered training sequence;

The instantaneous error acquisition module, be used for the filtered training sequence that obtains according to described filtration module, obtain the instantaneous error of the described training sequence of choosing from the normal burst signal, described instantaneous error is the difference of described filtered training sequence and the described training sequence of choosing;

The sync bit adjusting module is used for the instantaneous error obtained according to described instantaneous error acquisition module, adjusts the sync bit of described normal burst signal.

8. the device of definite sync bit according to claim 7 is characterized in that, also comprises:

Filtering parameter is provided with module, is used to be provided with the filtering parameter that described training sequence is carried out Filtering Processing.

9. the device of definite sync bit according to claim 7 is characterized in that, described sync bit adjusting module comprises:

The instantaneous error quadratic sum is obtained submodule, is used for the instantaneous error according to every group of training sequence, obtains the quadratic sum of the instantaneous error of described every group of training sequence;

Adjustment amount is determined submodule, be used to choose the training sequence of the quadratic sum minimum of instantaneous error, and obtain the normal burst signal Synchronization position adjustment amount of the described training sequence correspondence of choosing, the normal burst signal Synchronization position adjustment amount that obtains is defined as described normal burst signal Synchronization position adjustment amount;

Sync bit is adjusted submodule, is used for determining the normal burst signal Synchronization position adjustment amount that submodule is determined according to described adjustment amount, adjusts the sync bit of described normal burst signal.

10. the device of definite sync bit according to claim 9 is characterized in that, described sync bit adjusting module also comprises:

The target adjustment amount is determined submodule, be used at described normal burst signal Synchronization position adjustment amount during at least two, with described at least two normal burst signal Synchronization position adjustment amounts stack, normal burst signal Synchronization position adjustment amount according to after the stack obtains the target adjustment amount of described normal burst signal Synchronization position.

11. the device of definite sync bit according to claim 10 is characterized in that, described target adjustment amount determines that submodule comprises:

Adjustment amount threshold value comparing unit is used for described two normal burst signal Synchronization position adjustment amounts stack at least, with the threshold ratio of the normal burst signal Synchronization position adjustment amount after the stack and default normal burst signal Synchronization position adjustment amount;

Target adjustment amount determining unit is used for the comparative result of described adjustment amount threshold value comparing unit, determines the target adjustment amount of described normal burst signal Synchronization position.

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