CN1822537A - Frame synchronization apparatus and frame synchronization method - Google Patents
Frame synchronization apparatus and frame synchronization method Download PDFInfo
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- CN1822537A CN1822537A CNA2006100067261A CN200610006726A CN1822537A CN 1822537 A CN1822537 A CN 1822537A CN A2006100067261 A CNA2006100067261 A CN A2006100067261A CN 200610006726 A CN200610006726 A CN 200610006726A CN 1822537 A CN1822537 A CN 1822537A
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Abstract
An averaging block (101) calculates a moving average of a correlation value calculated. A scale factor multiplication block (102) multiplies the correlation value which has been moving-averaged by a predetermined scale factor. An ideal correlation value generation block (103) calculates an ideal correlation value by using a reception signal in a line state having no level fluctuation due to fading fluctuation or no noise or no delayed wave and a known signal identical to a known signal contained in the reception signal. A time shifting block (104) outputs the ideal correlation value shifted on a temporal axis to a square error detection block (105). The square error detection block (105) detects a square error between the correlation value from the scale factor multiplication block (102) and the ideal correlation value from the time shifting block (104). A minimum error detection block (106) detects a minimum value of the detected square error, i.e., a minimum square error. A moving time detection block (107) detects a synchronization time by using the detected minimum square error.
Description
Patent application of the present invention is dividing an application of following patent application:
Application number: 02801234.8; The applying date: on April 12nd, 2002; Denomination of invention: frame-synchronizing device and frame synchornization method
Technical field
The present invention relates to use correlation technique to carry out and obtain synchronously and synchronous frame-synchronizing device and the frame synchornization method of following the tracks of.
Background technology
Because emitting side device or receiver side device or both frequently move in mobile communication system, so always change from the time (that is propagation delay time) that the signal x time by the emitting side emission began till this time of reception that transmits.Therefore, need the emission timing of receiver side device use received signal detection emitting side device, and regularly obtain lock in time according to the emission that is detected.Specifically, according to the emission timing that the use received signal detects, need the execution of receiver side device to receive obtaining (obtaining synchronously) and carrying out reception accurately regularly (the synchronous tracking) of timing.
Disclosed method is an example of traditional mobile communication method for synchronous in Japanese patent application 11-88455 number.With reference to Fig. 1 and Fig. 2 this conventional synchronization method is described below.Fig. 1 is the flow chart that the conventional synchronization method is shown.Fig. 2 is the figure that the cross correlation value in the conventional synchronization method is shown.
In the receiver side device, in step (being designated hereinafter simply as " ST ") 11, use as the received signal and the unique word signal that transmit by the emission of emitting side device, calculate cross correlation value.In addition, the emission of emitting side device comprises transmitting of this unique word signal.At this, compute classes is similar to cross correlation value shown in Figure 2.At ST12, the maximum F1 in the cross correlation value that storage is calculated.At ST13, by maximum F1 be multiply by coefficient T H, calculated threshold F0.
At ST14-ST17,, detect the cross correlation value position that surpasses threshold value F0 by at each sample point (i) compare threshold F0 and cross correlation value.At first, point (a) shown in Figure 2 is detected as the cross correlation value position that cross correlation value surpasses threshold value.With the location storage of point (a) is position (i), and the cross correlation value A of memory location (i).
At ST18, obtain the cross correlation value B of the position (i+1) of back, position (i) one sample.At ST19, compare the cross correlation value A and the cross correlation value B that are stored.At ST20, if the cross correlation value B of position (i+1) greater than cross correlation value A, then is updated to position (i+1) with position (i), and the cross correlation value A that is updated position (i) is updated to cross correlation value B.On the other hand, if the cross correlation value B of position (i+1) less than cross correlation value A, then at ST21, cross correlation value first peak that is detected is the position (i) of current point in time, it is considered to the synchronous points (lock in time) of next frame.In cross correlation value shown in Figure 2, position P2 is detected as first peak of cross correlation value.Because position P2 becomes the lock in time of next frame, therefore receive regularly and proofreaied and correct.
According to this method for synchronous, the receiver side device carry out by the emission of emitting side device transmit obtaining synchronously and following the tracks of synchronously.
Yet,, be to be difficult under the particular channel quality, accurately detect synchronous points so there is a problem because in the aforementioned conventional method for synchronous, use the cross correlation value of being calculated and the comparative result of threshold value to detect synchronous points (lock in time).
The first, in the receiver side device, compare with the delay ripple level that this transmits by the ripple formerly that transmits (main ripple) level of emitting side device emission, under the particular channel quality, may descend suddenly.Specifically, as shown in Figure 3, under the particular channel quality, corresponding to the cross correlation value level 21 of ripple formerly with correspond respectively to first to the 3rd cross correlation value level 22-24 that postpones ripple and compare suddenly and descend.In this case, the cross correlation value corresponding to the some a1 of accurate synchronization position becomes less than threshold value.Therefore, when using the aforementioned conventional method for synchronous, some a2 rather than some a1 are lock in time by error detection.
The second, not only in the receiver side device, compare with the delay ripple level that this transmits by the level of ripple formerly that transmits of emitting side device emission, under the particular channel quality, may descend suddenly, and this formerly ripple and postpone the reception of ripple may be very close.Specifically, as shown in Figure 4, corresponding to the cross correlation value level 31 of ripple formerly with correspond respectively to first to the 4th cross correlation value level 32-35 that postpones ripple and compare under the particular channel quality and descend suddenly, in addition, corresponding to the cross correlation value 31 of ripple formerly with to postpone the cross correlation value 32 of ripple corresponding to first very close in time.
According to above-mentioned conventional synchronization method, will storage surpass the some b1 cross correlation value of threshold value, and the cross correlation value of the some b2 of a sample behind this cross correlation value and the b1 compared, and have only when the cross correlation value of some b2 more hour, just will put b1 and detect and be lock in time.Yet, become less than the cross correlation value of a b2 corresponding to the some b1 cross correlation value of accurate synchronization time.As a result, when using the aforementioned conventional method for synchronous, some b3 rather than some b1 are lock in time by error detection.
The 3rd, in the cross correlation value of calculating by receiving system under the particular channel quality that is subjected to influences such as multipath, corresponding to the position of the cross correlation value of ripple formerly the gap may appear.With reference to Fig. 5 a concrete example is described.When not having multipath, for example suppose that the cross correlation value corresponding to ripple formerly becomes maximum (that is, make c1 as synchronous points if proofread and correct to receive regularly, then necessarily can receive ripple formerly) at a c1.When having multipath, not to be maximum corresponding to the cross correlation value of ripple formerly, but may the some c2 after a c1 be maximum at a c1.Therefore, owing to postpone the influence of ripple, be that peaked position is offset corresponding to the cross correlation value of ripple formerly.Under situation shown in Figure 5, according to the conventional synchronization method, some c2 rather than some c1 are detected as lock in time.
In the aforementioned conventional method for synchronous, it is impossible correctly detecting synchronous points under the influence of channel quality, promptly synchronous gap can occur.Therefore, be difficult to accurately carry out and obtain synchronously and follow the tracks of synchronously.
Another conventional frame synchronizer and method is disclosed in Japanese patent application 10-70489 number.
Fig. 6 is a kind of block diagram of conventional frame synchronizer.In this device, the received signal process frequency inverted frequency inverted part 1 that receives from antenna is a baseband signal, and through digitlization, this numerical data is input to n exponent number word matched filter 5 in A/D converter 3, to carry out relevant with the PN sign indicating number of exporting from PN code generator 7.Then, the relevant output that is obtained is output to accumulator 9, wherein, is each phase-accumulated relevant output.The phase place of maximum accumulated value is defined as initial synchronization time, and output should be determined signal.
Yet, in conventional apparatus, add up with the relevant output of known signal to received signal, therefore, need memory channel cumulative data before, thereby being used to detect the operation that adds up of initial synchronization time according to this accumulated value execution, is that hardware size becomes greatly thereby there is a problem, and this mainly is because need memory capacity such as RAM to come memory channel cumulative data before.
And, for reducing hardware size, optimum relevant output window is set carries out and add up (as the some symbols in front and back of correlation peak etc.), and will being used for carrying out the relevant output area that adds up, to be restricted to window be possible.But, adopt this method, when optimally window not being set, specifically, do not comprise that in the scope that is being made as window initial synchronization time is during the cycle, for example, when the level of disturbing wave is higher than the level of required ripple, exist a problem to be, when window being set, will detect initial synchronization time mistakenly in the disturbing wave position.
Summary of the invention
The objective of the invention is accurately to carry out and obtain synchronously and follow the tracks of synchronously, and the frame-synchronizing device and the frame synchornization method that can minimize hardware size is provided.
First aspect present invention provides a kind of frame-synchronizing device, comprising: relevant output test section is used to detect the received signal of the scheduled time and the relevant output of synchronization character; The threshold determination part is used to judge that whether the relevant output that is detected is greater than threshold value; The time data storage area is used to store the pairing time data of relevant output that is defined as greater than threshold value; The frequency distribution generating portion is used to use the time data generated frequency of being stored to distribute; The peak frequency test section is used for detecting the peak frequency of the frequency distribution that is generated; The initial synchronization time test section, the time that is used for the peak frequency that will be detected is appointed as initial synchronization time; Standard value is judged part, is used to judge whether the peak frequency that is detected is lower than standard value; The threshold value correction portion is used for when judging that the peak frequency that is detected is lower than standard value threshold value being proofreaied and correct; And control section, be used to use threshold value to carry out initial synchronization once more from beginning through overcorrect.
Second aspect present invention also provides a kind of frame-synchronizing device, comprising: relevant output test section is used to detect the received signal of the scheduled time and the relevant output of synchronization character; The threshold determination part is used to judge that whether the relevant output that is detected is greater than threshold value; The time data storage area is used to store the pairing time data of relevant output that is defined as greater than threshold value; The frequency distribution generating portion is used to use the time data generated frequency of being stored to distribute; The peak frequency test section is used for detecting the peak frequency of the frequency distribution that is generated; The initial synchronization time test section, the time that is used for the peak frequency that will be detected is appointed as initial synchronization time; The value of setting is judged part, is used to judge whether the time data number of being stored is lower than the value of setting; The threshold value correction portion is used for when judging that the time data number of being stored is lower than the value of setting threshold value being proofreaied and correct; And control section, be used to use threshold value to carry out initial synchronization once more from beginning through overcorrect.
Third aspect present invention provides a kind of communication terminal, comprises the described frame-synchronizing device of above-mentioned first aspect or second aspect.
Fourth aspect present invention provides a kind of base station apparatus, comprises the described frame-synchronizing device of above-mentioned first aspect or second aspect.
Fifth aspect present invention provides a kind of frame synchornization method, comprising: relevant output detects step, is used to detect the received signal of the scheduled time and the relevant output of synchronization character; The threshold determination step is used to judge that whether the relevant output that is detected is greater than threshold value; The time data storing step is used to store the pairing time data of relevant output that is defined as greater than threshold value; Frequency distribution generates step, is used to use the time data generated frequency of being stored to distribute; Peak frequency detects step, is used for detecting the peak frequency of the frequency distribution that is generated; Initial synchronization time detects step, and the time that is used for the peak frequency that will be detected is appointed as initial synchronization time; The standard value determination step is used to judge whether the peak frequency that is detected is lower than standard value; The threshold value aligning step is used for when judging that the peak frequency that is detected is lower than standard value threshold value being proofreaied and correct; And controlled step, be used to use threshold value to carry out initial synchronization once more from beginning through overcorrect.
Sixth aspect present invention provides a kind of frame synchornization method, comprising: relevant output detects step, is used to detect the received signal of the scheduled time and the relevant output of synchronization character; The threshold determination step is used to judge that whether the relevant output that is detected is greater than threshold value; The time data storing step is used to store the pairing time data of relevant output that is defined as greater than threshold value; Frequency distribution generates step, is used to use the time data generated frequency of being stored to distribute; Peak frequency detects step, is used for detecting the peak frequency of the frequency distribution that is generated; Initial synchronization time detects step, and the time that is used for the peak frequency that will be detected is appointed as initial synchronization time; The value of setting determination step is used to judge whether the time data number of being stored is lower than the value of setting; The threshold value aligning step is used for when judging that the time data number of being stored is lower than the value of setting threshold value being proofreaied and correct; And controlled step, be used to use threshold value to carry out initial synchronization once more from beginning through overcorrect.
Carry out the desirable correlation and the difference of two squares that multiply by between the described correlation of being scheduled to after the amplification factor after the time shift by calculating with the predetermined migration time, and detect corresponding to the difference of two squares of being calculated for the shift time of minimum desirable correlation as lock in time, can realize this purpose.
Description of drawings
Fig. 1 is the flow chart that a kind of conventional synchronization method is shown;
Fig. 2 is the figure that the cross correlation value in the conventional synchronization method is shown;
Fig. 3 is the figure that first problem in the conventional synchronization method is shown;
Fig. 4 is the figure that second problem in the conventional synchronization method is shown;
Fig. 5 is the figure that the 3rd problem in the conventional synchronization method is shown;
Fig. 6 is a kind of block diagram of conventional frame synchronizer;
Fig. 7 is the block diagram according to the frame-synchronizing device of the embodiment of the invention 1;
Fig. 8 is the concept map according to the performed frame synchronization of the frame-synchronizing device of the embodiment of the invention 1;
Fig. 9 is the flow chart that illustrates according to the performed frame synchronization operation of the frame-synchronizing device of the embodiment of the invention 1;
Figure 10 A is illustrated in according to the figure that lock in time occurs the gap that threshold method detects is set;
Figure 10 B is illustrated in according to the figure that lock in time occurs the gap that threshold method detects is set;
Figure 11 is the picture group that the correlation that obtains for each branch according to the frame-synchronizing device of the embodiment of the invention 2 is shown;
Figure 12 is the block diagram according to the frame-synchronizing device of the embodiment of the invention 2;
Figure 13 is the block diagram according to the frame-synchronizing device of the embodiment of the invention 3;
Figure 14 A is the figure that the performed frame synchronization of frame-synchronizing device (first example) according to the embodiment of the invention 4 is shown;
Figure 14 B is the figure that the performed frame synchronization of frame-synchronizing device (first example) according to the embodiment of the invention 4 is shown;
Figure 15 A is the figure that the performed frame synchronization of frame-synchronizing device (second example) according to the embodiment of the invention 4 is shown;
Figure 15 B is the figure that the performed frame synchronization of frame-synchronizing device (second example) according to the embodiment of the invention 4 is shown;
Figure 15 C is the figure that the performed frame synchronization of frame-synchronizing device (second example) according to the embodiment of the invention 4 is shown;
Figure 16 is the block diagram according to the frame-synchronizing device of the embodiment of the invention 4;
Figure 17 is the block diagram according to the frame-synchronizing device of the embodiment of the invention 5;
Figure 18 is the block diagram according to the frame-synchronizing device of the embodiment of the invention 6;
Figure 19 is the block diagram according to the frame-synchronizing device of the embodiment of the invention 7;
Figure 20 is the block diagram according to the frame-synchronizing device of the embodiment of the invention 8; And
Figure 21 is the block diagram according to the frame-synchronizing device of the embodiment of the invention 9.
Embodiment
Below with reference to accompanying drawings a plurality of embodiment of the present invention are carried out concrete description.
(embodiment 1)
Fig. 7 is the block diagram according to the frame-synchronizing device of the embodiment of the invention 1.In Fig. 7, correlation is input to average portion 101.This correlation is to use and is inserted in by the received signal of emitting side device emission with by the emitting side device as transmitting that known signal (known synchronization character) in the received signal calculates.
It is average that the correlation that 101 pairs of average portions are calculated is carried out skew (shift).Carrying out this skew on average is in order to compensate the quick level fluctuation of the correlation that produces because of decline.Skew on average for example can be adopted in such a way and realized: will be from forgeing that (oblivion) coefficient lambda multiply by each correlation of correlation of calculating and value addition that the value that obtains obtains with (1-λ) being multiply by to the last mean value once.If it is big to forget coefficient lambda, then can make the skew mean value that is obtained corresponding to long interval the variation, on the contrary,, then can make the skew mean value that is obtained corresponding to short interval the variation if it is little to forget coefficient lambda.The amplification factor part 102 that multiplies each other multiplies each other its skew correlation and predetermined amplification factor of on average being performed.The correlation that multiply by after the predetermined amplification factor outputs to difference of two squares test section 105.
Desirable correlation generating portion 103 is used not with the known signal that is comprised in the received signal under the channel circumstance of the level fluctuation that produces because of the decline fluctuation, noise or delay ripple, calculate correlation, and the correlation of calculating is outputed to time shift part 104 as desirable correlation.Time shift part 104 is offset desirable correlation on time shaft, and will output to difference of two squares test section 105 through the desirable correlation of time shift.
Difference of two squares test section 105 is detected from the multiply each other correlation of part 102 and from the difference of two squares between the desirable correlation of time shift part 104 of amplification factor.The difference of two squares that is detected outputs to minimal error test section 106.The minimum value of the difference of two squares that is detected is detected in minimal error test section 106 in difference of two squares test section 105, promptly least square is poor.Shift time test section 107 uses the least square that is detected by minimal error test section 106 poor, detects lock in time.
With reference to Fig. 8, brief explanation is carried out in performed operation to the frame-synchronizing device with aforementioned structure below.Fig. 8 is the concept map according to the performed frame synchronization of the frame-synchronizing device of the embodiment of the invention 1.
At first, use the known signal that is comprised in the received signal that under the channel circumstance of the level fluctuation, noise or the delay ripple that do not produce, receives, calculate desirable correlation 201 with fluctuating because of decline.Next step, the use conduct transmits by the received signal of emitting side device emission and is similar to the known signal that is included in the received signal, calculates correlation.Then, it is average the correlation of calculating to be carried out skew.Therefore, obtain through the average correlation 203 of skew.
The desirable correlation 201 that use is calculated and through the average correlation 203 of skew, and according to following process detects in the correlation 203 corresponding to the position of ripple formerly, therefore, detects lock in time.The scope of beginning part in the desirable correlation 201 just, at first is set.Specifically, the quantity of desirable correlation being almost 0 part 201-1 is the rising part that the scope of the best part 201-2 is made as desirable correlation 201 up to the quantity of desirable correlation.At this moment, the time corresponding to part 201-1 in the desirable correlation 201 is t1, and in the desirable correlation 201 time corresponding to part 201-2 be t2.Just, the timing range corresponding to desirable correlation 201 rising parts is that t1 is to t2.
At first step, in timing range, calculate desirable correlation 201 and carried out the difference of two squares that is offset between the average correlation (being designated hereinafter simply as " correlation ") 203 corresponding to desirable correlation 201 rising parts.Specifically, calculate time t1 in the desirable correlation 201 in the correlation of time t2 and the correlation 203 time t1 to the difference of two squares between the correlation of time t2.When the difference of two squares of calculating during, the difference of two squares of calculating is made as new minimum value less than the previous minimum value that is provided with.In this is provided with, its desirable correlation 201 is made as current lock in time by the time of time migration (shift time).In addition, will be explained below the shift time of desirable correlation 201.
In second step, correlation 203 and amplification factor (at this, amplification factor is N) are multiplied each other.Therefore, obtain correlation 204.In addition, in timing range, calculate the difference of two squares between desirable correlation 201 and the correlation 204 corresponding to desirable correlation 201 rising parts.When the difference of two squares of calculating during, the difference of two squares of calculating is made as new minimum value less than the previous minimum value that is provided with.In this is provided with, be similar to first step, its desirable correlation 201 is made as current lock in time by the time of time migration (shift time).
At third step, increase and to be used for the amplification factor that multiplies each other with correlation 203, then with correlation 203 with increase after amplification factor (at this, amplification factor is N2) multiply each other.In addition, be similar to second step, the difference of two squares between the correlation 203 after in corresponding to the timing range of desirable correlation 201 rising parts, calculating desirable correlation 201 and multiply by amplification factor N2 (not illustrating in the drawings).Then, carry out the operation that is similar to second step.After execution is similar to the operation of second step, correlation 203 orders be multiply by the amplification factor of increase up to maximum amplification factor M, then, carry out being similar to above-mentioned operation.
In the 4th step, on time shaft, desirable correlation 201 is offset a small time T 1 spacing of small time T 1 (that is, corresponding to) to the right.At this moment, time (in other words, shift time) of being offset of desirable correlation 201 is T1.Then, execution is similar to the operation of first step to third step.
In the 5th step, 201 of desirable correlations with the aforementioned small time to the right sequence offsets be T (that is, shift time increases with T1 * 2, T1 * 3) up to shift time, then, carry out the operation of aforementioned first step-third step similarly.
In addition, desirable correlation 202 shown in Figure 8 is examples of the desirable correlation of process time shift.At this, the quantity of desirable correlation 202 being almost 0 part 202-1 is the rising part that the scope of the best part 202-2 is made as desirable correlation 202 up to the quantity of desirable correlation 202.At this moment, the time corresponding to part 202-1 in the desirable correlation 202 is t3, and in the desirable correlation 202 time corresponding to part 202-2 be t4.Just, the timing range corresponding to desirable correlation 202 rising parts becomes t3 to t4.In addition, can not carry out multiplying each other of correlation and amplification factor this moment, but can carry out desirable correlation multiply each other, skew and difference of two squares calculating.
If with this ideal correlation 202 is example, then at first step, calculate time t3 in the desirable correlation 202 in the correlation of time t4 and the correlation 203 time t3 to the difference of two squares between the correlation of time t4.As mentioned above, when the difference of two squares of calculating during, the difference of two squares of calculating is made as new minimum value less than the previous minimum value that is provided with.In this is provided with, desirable correlation 202 is made as current lock in time by the time of time migration (shift time).Similarly, in second step, correlation 203 and amplification factor (at this, amplification factor is N) are multiplied each other.Therefore, obtain correlation 204.In addition, in timing range, calculate the difference of two squares between desirable correlation 202 and the correlation 204 corresponding to desirable correlation 202 rising parts.Then, when the difference of two squares of calculating during, the difference of two squares of calculating is made as new minimum value less than the previous minimum value that is provided with.In this is provided with, be similar to first step, desirable correlation 201 is made as current lock in time by the time of time migration.
Similarly,, increase and to be used for the amplification factor that multiplies each other with correlation 203 at third step, then with correlation 203 with increase after amplification factor (at this, amplification factor is N2) multiply each other.And, be similar to second step, in timing range corresponding to desirable correlation 202 rising parts, the difference of two squares between the correlation 203 (not illustrating in the drawings) after calculating desirable correlation 202 and multiply by amplification factor N2.Then, carry out the operation that is similar to second step.After execution is similar to the operation of second step, correlation 203 orders be multiply by the amplification factor of increase up to maximum amplification factor M, then, carry out being similar to above-mentioned operation.
Be detected as final lock in time set lock in time in when operation when finishing first step-Di five steps.Specifically, suppose such situation: finished the 5th step operation, and with desirable correlation 202 and multiply by amplification factor X (difference of two squares between the correlation 203 behind N≤X≤M) is made as minimum value, and then t4 is detected as lock in time temporarily.In this case, because the rising part of desirable correlation 202 roughly meets in the correlation 203 that multiply by amplification factor X the part corresponding to time interval t3-t4, therefore formerly ripple is arranged in correlation 203 and becomes clear corresponding to the part of time t4.Up to the present, the operation summary performed according to the frame-synchronizing device of present embodiment has been described above.
With reference to Fig. 9, performed operation describes to the frame-synchronizing device with aforementioned structure below.Fig. 9 is the flow chart that illustrates according to the performed frame synchronization operation of the frame-synchronizing device of the embodiment of the invention 1.
At first,, use the known signal that is comprised as in the received signal that transmits by the emission of emitting side device, calculate correlation at ST301.At ST302, it is average that the correlation of calculating at ST301 is carried out skew.Poor in order to detect least square, at ST303, initial value MIN (for example, 1.0e+20 etc.) is set.
At ST304, with the desirable correlation skew scheduled time.For example, this scheduled time is 0 in first circulation, but after second circulation, it can be a small time T 1.At ST305, the initial value of the amplification factor N that setting will be multiplied each other with correlation.At ST306, amplification factor N and correlation are multiplied each other.At ST307, the difference of two squares between the correlation after calculating desirable correlation and multiply by amplification factor N.
At ST308, compare the difference of two squares and the MIN that calculate at ST307.When squared differences during less than MIN, then the MIN value is updated to this squared differences (ST309), and its desirable correlation is stored as current lock in time (310) by the time of time migration (shift time), else process enters ST311.On the contrary, when in the ST308 squared differences during greater than MIN, process enters ST311.
At ST311, compare amplification factor N and maximum amplification factor M.As amplification factor N during less than maximum amplification factor M, increase amplification factor N to reduce the influence (ST312) of the decline level of ripple (depression level) formerly in the correlation, further handle and enter above-mentioned ST306.On the other hand,, use this maximum amplification factor M to reduce to influence level ripple formerly, can reach enough level, further handle advancing to ST313 as amplification factor N during greater than maximum amplification factor M.
At ST313, more current shift time and T.If current shift time less than T and within the window ranges that is detected, is then further handled and is entered aforementioned ST304.On the other hand, if current shift time greater than T and outside the window ranges that is detected, is then further handled and is entered ST314.At ST314, the current shift time of storing is detected as final lock in time.The operation performed according to the frame-synchronizing device of present embodiment described above.
As described in above the present embodiment, in timing range, calculate by the desirable correlation after the time migration scheduled time and the difference of two squares between the correlation after multiply by predetermined amplification factor corresponding to described desirable correlation rising part.And will detect corresponding to the shift time of the desirable correlation of the least square difference between the desirable correlation of the skew scheduled time and the correlation that multiply by predetermined amplification coefficient is final lock in time.
Therefore, even compared with the delay ripple level that this transmits by the ripple formerly that transmits (main ripple) level of emitting side device emission, descend suddenly under the particular channel quality, accurately detecting in the correlation formerly, the position of ripple also is possible.Second, even not only compare with the delay ripple level that this transmits by the level of ripple formerly that transmits of emitting side device emission, under the particular channel quality, descend suddenly, and ripple and to postpone the reception of ripple very close in time formerly, accurately detecting in the correlation formerly, the position of ripple also is possible.The 3rd, even under the particular channel quality that is subjected to influence such as multipath, in the position that occurs corresponding to the cross correlation value of ripple formerly the gap takes place, accurately detecting in the correlation formerly, the position of ripple also is possible.Therefore, carry out accurately according to present embodiment that to obtain synchronously and follow the tracks of synchronously be possible.
Except that above-mentioned frame synchornization method, the inventor has also invented another and has solved the method for foregoing problems.That is to say, in other method, at first, and in the time range that begins part corresponding to described desirable correlation, the difference of two squares between the correlation after calculating is offset the correlation after the scheduled time and multiply by predetermined amplification factor.Then, detection be multiply by the amplification factor that minimizes the difference of two squares between correlation and the desirable correlation mutually with correlation.Then, in the correlation of the amplification factor that detects multiply by, detect surpassing mainly is that time of predetermined threshold value is as final lock in time.According to this method, compare with conventional method and to carry out accurately that to obtain synchronously and follow the tracks of synchronously be possible.
Yet, when adopting this method, according to threshold setting method few gap (gap) appearred in the lock in time of being detected.Provide below with reference to Figure 10 (A) and Figure 10 (B) and to specify.Figure 10 (A) and Figure 10 (B) are illustrated in the figure that the gap appears in the lock in time of detecting according to threshold setting method.Shown in Figure 10 (A) and Figure 10 (B), correlation is by each is put and forms with the 1/XMHz frequency collection.Therefore, can expect in the lock in time of being detected, the gap can occur according to how threshold value is set.Shown in Figure 10 (A), when adopting threshold value A, the time corresponding to the 7th that has just surpassed threshold value A is detected as final lock in time.Yet shown in Figure 10 (B), when adopting threshold value B, the time corresponding to the 8th that has just surpassed threshold value B is detected as final lock in time.
On the other hand, according to present embodiment, the mode of threshold value detects lock in time not adopt as mentioned above.Just, can accurately detect lock in time and not rely on threshold value.In addition because according to present embodiment not needs carry out the processing that the amplification factor that will be detected and correlation multiply each other once more, so to reduce required operand be possible.
(embodiment 2)
In the present embodiment, with reference to Figure 11 the situation of branch detection lock in time of using a plurality of embodiment 1 correlations is described.Figure 11 is the picture group that the correlation that obtains for each branch according to the frame-synchronizing device of the embodiment of the invention 2 is shown.Figure 11 illustrates the situation of 3 branches as a plurality of branches of using.
In Figure 11, correlation 501 is to use the branch 1 of received signal and is included in the correlation that the known signal in the received signal is calculated.Similarly, correlation 502 (503) is to use the branch 2 (branch 3) of received signal and is included in the correlation that the known signal in the received signal is calculated.
At first, the correlation 501 of branch 1 detect in each of the correlation 503 of branch 3 become maximum correlation value (maximum related value) after, detect time corresponding to this maximum related value.Specifically, in the correlation 501 of branch 1, detect maximum related value 501-1, and detect time A corresponding to this maximum related value 501-1.Similarly, in the correlation 502 (correlation 503) of branch 2 (branch 3), detect maximum related value 502-1 (maximum related value 503-1), and detect time B (time C) corresponding to this maximum related value 502-1 (maximum related value 503-1).
Next step, in the maximum related value of each detection branches detection time the most forward maximum related value.At this, detect maximum related value 502-1.Then, use correlation, carry out embodiment 1 described frame synchronization process corresponding to the branch of detection maximum related value.Use is corresponding to the correlation of the branch of maximum related value 502-1, and promptly the correlation 502 of branch 2 is carried out frame synchronization.
With reference to Figure 12, the structure according to the synchronous frame-synchronizing device of present embodiment achieve frame will be described below.Figure 12 is the block diagram according to the frame-synchronizing device of the embodiment of the invention 2.In addition, the part that is similar to embodiment 1 (Fig. 7) among Figure 12 is assigned the label that is similar to Fig. 7, and will omit its explanation.
Correlation value calculation part 602-1 uses the known signal that is comprised in the signal (received signal of branch 1) that is received by antenna 601-1, the correlation of Branch Computed 1.Correlation value calculation part 602-2 uses the known signal that is comprised in the signal (received signal of branch 2) that is received by antenna 601-2, the correlation of Branch Computed 2.Similarly, correlation value calculation part 602-3 uses the known signal that is comprised in the signal (received signal of branch 3) that is received by antenna 601-3, the correlation of Branch Computed 3.
Maximum test section 603-1 detects maximum related value in the correlation of branch 1, and detects the time corresponding to the detection maximum related value.Maximum test section 603-1 outputs to selection part 604 with the correlation of branch 1 and the time of being detected.Similarly, maximum test section 603-2 (603-3) detects maximum related value in the correlation of branch 2 (branch 3), and detects the time corresponding to the detection maximum related value.Maximum test section 603-2 (603-3) outputs to selection part 604 with the correlation of branch 2 (branch 3) and the time of being detected.
At first, select part 604 from maximum test section 603-1 to the institute of 603-3 free in the time value of detection minimum.In addition, select part 604 to output to average portion 101 from maximum test section 603-1 correlation corresponding to institute detection time in all correlations of 603-3.
In other words, select part 604 in the maximum related value of all branches detection time the most forward maximum related value, and will output to average portion 101 corresponding to the correlation of the branch of detection maximum related value.Because average portion 101 is described in embodiment 1 to the similar of shift time test section 107, so omit its detailed description.
Therefore,, detect the most forward correlation of time in the correlation of a plurality of branches, and only use the correlation that is detected to detect lock in time according to present embodiment.Thereby, can not use wherein the correlation of the branch that ripple formerly worsens because of the influence of decline etc. to detect lock in time.Therefore, it is possible comparing the accuracy that improvement is obtained synchronously and follow the tracks of synchronously with embodiment 1.
(embodiment 3)
In the present embodiment, with reference to aforementioned Figure 11, the accumulation result that uses a plurality of branches correlation that provides in embodiment 1 is detected the situation of lock in time describe.In addition, to use 3 branches to describe as example as the situation of a plurality of branches.
In the present embodiment, use the accumulation result of the correlation 501-503 of the 1-3 of each branch, carry out embodiment 1 described frame synchronization.Thereby because can reduce the required time of average correlation, to carry out that high-speed synchronous is obtained and follow the tracks of synchronously be possible so compare with embodiment 1 or embodiment 2.
Next step with reference to Figure 13, will illustrate the structure according to the synchronous frame-synchronizing device of present embodiment achieve frame below.Figure 13 is the block diagram according to the frame-synchronizing device of the embodiment of the invention 3.In addition, the part that is similar to embodiment 1 (Fig. 7) and embodiment 2 (Figure 12) among Figure 13 is assigned the label identical with Fig. 7 and Figure 12, and will omit its explanation.Accumulator 701 outputs to average portion 101 to the accumulation result of the correlation of branch 3 as new correlation with the correlation of branch 1.
Therefore,, use the correlation accumulation result of a plurality of branches, detect lock in time according to present embodiment.Thereby because can reduce the required time of average correlation, to carry out more that high-speed synchronous obtains and follow the tracks of synchronously be possible so compare with embodiment 1 or embodiment 2.
(embodiment 4)
In the present embodiment, will describe accurately and at high speed detecting the lock in time that provides among the embodiment 1-embodiment 3.In the present embodiment, use the position of the ripple formerly that detects in embodiment 1-embodiment 3, lock in time is estimated in skew.At this, estimate that be the lock in time of pre-estimating by the initial synchronisation of using lock in time in conventional method.Provide specific description with reference to Figure 14 and 15.
Figure 14 illustrates according to the performed frame synchronization of the frame-synchronizing device of the embodiment of the invention 4 (first example).Figure 15 illustrates according to the performed frame synchronization of the frame-synchronizing device of the embodiment of the invention 4 (second example).
When being shown in as Figure 14 (B) when estimating that skew (for example, greater than the time corresponding to 1 symbol) significantly takes place in the position of being detected in lock in time of ripple formerly, estimate that be offset to offset direction (being directions X among the figure) lock in time.
On the other hand, when slight shift (for example, less than the time corresponding to 1 symbol) takes place in the position of being detected when be shown in estimation lock in time (Figure 15 (B)) as Figure 14 (A) in of ripple formerly, detect and estimate offset direction lock in time.Specifically, under the situation shown in Figure 15 (A), detect from ripple position formerly, and under the situation shown in Figure 15 (C), detect from ripple position formerly to the estimation lock in time of Y1 direction skew to the estimation lock in time of Y2 direction skew.
As long as detect when estimating to be offset lock in time, just increase corresponding to this counter of estimating skew lock in time.Just, under the situation shown in Figure 15 (A), according to the counter increase of Y2 direction, and under the situation shown in Figure 15 (C), according to the counter increase of Y1 direction.
When aforementioned counter surpasses a constant value, will estimate to be offset lock in time the time of 1 sample (for example, corresponding to) with going up in the opposite direction corresponding to the side of counter small (minute) time.For example, when the counter corresponding to Y2 (Y1) direction surpasses a constant value, on Y1 (Y2) direction, will estimate to be offset lock in time a small time.
Continue aforementioned processing, up to estimating lock in time and the gap vanishing between the ripple position formerly.Therefore, even significantly synchronous gap occurs, it also is possible carrying out the high-speed synchronous tracking, even and slight synchronous gap occurs, it also is possible carrying out the synchronous tracking of pinpoint accuracy.
Next step with reference to Figure 16, will illustrate the structure according to the synchronous frame-synchronizing device of present embodiment achieve frame below.Figure 16 is the block diagram according to the frame-synchronizing device of the embodiment of the invention 4.Though the situation of ripple position is example to use embodiment 1 to detect formerly, the ripple position also is possible in fact to use embodiment 2 or embodiment 3 to detect formerly in Figure 16.In addition, the part that is similar to embodiment 1 (Fig. 7) among Figure 16 is assigned the label identical with Fig. 7, and will omit its explanation.
Estimate that lock in time, initial synchronization detection lock in time was used in test section 1001, and should output to rating unit 1002 and Offset portion 1005 lock in time as estimating lock in time.Rating unit 1002 compares between the lock in time of being detected by shift time test section 107 (that is, formerly ripple position) and estimation lock in time from estimation test section lock in time 1001.When estimating lock in time and formerly the difference gap occurring between the ripple position, rating unit 1002 will represent that the gap information that the gap occurs outputs to gap direction test section 1003.When estimating lock in time and formerly the gap not occurring between the ripple position, this estimation is detected as final lock in time lock in time.
When rating unit 1002 receives gap information, gap direction test section 1003 detect estimate lock in time with respect to ripple offset formerly to which direction, and testing result outputed to counter 1004.Counter 1004 increases counting (for example, as shown in figure 15, corresponding to the counter of Y1 direction with corresponding to the counter of Y2 direction) according to the offset direction of estimating lock in time, and Counter Value is outputed to Offset portion 1005.
When Counter Value surpasses a constant value, Offset portion 1005 will estimate to be offset lock in time a small time with going up in the opposite direction corresponding to the side of counter.Therefore, the estimation of a small time of skew is detected as final lock in time lock in time.
(embodiment 5)
Figure 17 is the block diagram according to the frame-synchronizing device of the embodiment of the invention 5.
As shown in figure 17, frame-synchronizing device comprises relevant output test section 1110, threshold determination part 1120, time data storage area 1130, frequency distribution generating portion 1140, peak frequency test section 1150 and initial synchronization time test section 1160.
The relevant output of scheduled time received signals and synchronization character is detected in relevant output test section 1110.
Time data storage area 1130 for example in RAM storage be judged to be the pairing time data of relevant output as the result of determination of threshold determination part 1120 above threshold value.
Frequency distribution generating portion 1140 is used the time data that is stored in the time data storage area 1130, and generated frequency distributes.
The peak frequency in the frequency distribution that is generated by frequency distribution generating portion 1140 is detected in peak frequency test section 1150.
Pairing time of peak frequency of being detected by peak frequency test section 1150 is detected as initial synchronization time in initial synchronization time test section 1160.
To the operation of the frame-synchronizing device that comprises aforementioned structure be described below.
At first, the scheduled time received signal that receives from unshowned antenna is imported into the relevant output test section 1110, and detect the relevant output of the scheduled time received signal of importing and synchronization character.In addition, in threshold determination part 1120, relevant output and the threshold value that is detected compared, and judge whether the relevant output that is detected surpasses threshold value.Then, in time data storage area 1130, will be stored among the RAM as the pairing time data of relevant output that result of determination is judged to be above threshold value.
And, in frequency distribution generating portion 1140, use the time data generated frequency of being stored to distribute.Then, in peak frequency test section 1150, detect the peak frequency in institute's generated frequency distribution, and in initial synchronization time test section 1160, will be made as initial synchronization time corresponding to the time of detection peak frequency.
Therefore, according to present embodiment frame-synchronizing device judge whether the relevant output detected surpasses threshold value, and because only store the pairing time data of relevant output that is judged to be above threshold value, so only need store the memory capacity that is defined as above the pairing time data of relevant output of threshold value, therefore, it is possible minimizing hardware size.
And, use the time data of being stored, generated frequency distributes, and because the peak frequency time in this frequency distribution is made as initial synchronization time, so, mainly be not need to be provided with window, even and when the level of disturbing wave during greater than the level of required ripple, also can avoid flase drop to survey the initial synchronization time of disturbing wave position, therefore can correctly detect initial synchronization time.
In addition, though in threshold determination part 1120, carry out the standard that compares to determine that whether surpasses threshold value, might not be subject to this, and can use any standard that compares to determine more than or equal to threshold value according to present embodiment.
(embodiment 6)
Figure 18 is the block diagram according to the frame-synchronizing device of the embodiment of the invention 6.The basic structure of this frame-synchronizing device is similar to frame-synchronizing device shown in Figure 17, and therefore, similarly part is assigned identical label, and omits its explanation.
Present embodiment is characterised in that and comprises that standard value judges part 1152, judges that the peak frequency that detected is whether less than standard value the scheduled time frame number of ideal value (for example, as).In this case, when judging that the peak frequency detected is less than standard value, carry out initial synchronization once more from beginning, thereby it is controlled.
To the operation of the frame-synchronizing device that comprises aforementioned structure be described below.
At first, the scheduled time received signal that receives from antenna is input to the relevant output test section 1110, and detect the relevant output of the scheduled time received signal of importing and synchronization character.In addition, in threshold determination part 1120, relevant output and the threshold value that is detected compared, and judge whether the relevant output that is detected surpasses threshold value.Then, in time data storage area 1130, will be stored among the RAM as the pairing time data of relevant output that result of determination is judged to be above threshold value.
And, in frequency distribution generating portion 1140, use the time data generated frequency of being stored to distribute.Then, in peak frequency test section 1150, detect the peak frequency in institute's generated frequency distribution, and judge in the part 1152, judge that whether the peak frequency that is detected is less than standard value in standard value.
With reference to result of determination,, then judge initial synchronization time by error detection, and carry out initial synchronization once more from beginning when the peak frequency that is detected during less than standard value.
On the other hand, when peak frequency value of being above standard of being detected, in initial synchronization time test section 1160, will be made as initial synchronization time corresponding to the time of detection peak frequency.
Therefore, according to present embodiment frame-synchronizing device in, detect initial synchronization time, and peak frequency and standard value are compared, and judge whether mistake of the initial synchronization time detected, owing to carry out initial synchronization once more from beginning when judgement makes a mistake, it is possible therefore obtaining accurate and correct initial synchronization time, and the processing time during reducing to follow the tracks of also is possible.
In addition, though in standard value judgement part 1152, carry out the standard that compares to determine that whether is lower than standard value, might not be subject to this, and can use any standard that compares to determine that whether reaches standard value according to present embodiment.
(embodiment 7)
Figure 19 is the block diagram according to the frame-synchronizing device of the embodiment of the invention 7.In addition, the basic structure of this frame-synchronizing device is similar to frame-synchronizing device shown in Figure 180, and therefore, similarly construction unit is assigned identical label, and omits its explanation.
Present embodiment is characterised in that and comprises threshold value correction portion 1154, when threshold value according to do not fix with relatively changing of relevant output (below, the label that uses the threshold determination part of variable thresholding to be distributed is 1120a), and judge when the peak frequency that is detected is lower than standard value, threshold value is proofreaied and correct.In this case, when judging that the peak frequency detected is less than standard value, use threshold value through overcorrect from beginning to control the initial synchronisation position.
At this, as the threshold value bearing calibration, initial threshold is made as little value, and set in advance amplification coefficient according to peak frequency, threshold value is carried out timing at every turn and detect peak frequency, if threshold value is correct, then threshold value be multiply by amplification factor, and threshold value increases some decibels corresponding to the detection peak frequency.
To the operation of the frame-synchronizing device that comprises aforementioned structure be described below.
At first, the scheduled time received signal that receives from antenna is input to the relevant output test section 1110, and detect the relevant output of the scheduled time received signal of importing and synchronization character.In threshold determination part 1120a, relevant output and the threshold value (proofread and correct if exist, then be the threshold value after proofreading and correct) that is detected compared, and judge whether the relevant output that is detected surpasses threshold value.To be stored among the RAM of time data storage area 1130 as the pairing time data of relevant output that result of determination is judged to be above threshold value.
Then, in frequency distribution generating portion 1140, use the time data generated frequency of being stored to distribute.In peak frequency test section 1150, detect the peak frequency in institute's generated frequency distribution, and judge in the part 1152, judge that whether the peak frequency that is detected is less than standard value in standard value.
And, with reference to result of determination, when the peak frequency that is detected during less than standard value, then judge the initial synchronization time mistake that is detected, and in threshold value correction portion 1154, threshold value be multiply by amplification factor corresponding to the detection peak frequency, after threshold value improves some decibels, use the threshold value after proofreading and correct to carry out initial synchronization once more from beginning.
On the other hand, when peak frequency value of being above standard of being detected, in initial synchronization time test section 1160, will be made as initial synchronization time corresponding to the time of detection peak frequency.
Therefore, according to present embodiment frame-synchronizing device in, detect initial synchronization time, peak frequency and standard value are compared, and judge whether mistake of the initial synchronization time detected, and when judging when making a mistake because after threshold value proofreaied and correct from beginning to carry out once more initial synchronization, so can optimal threshold be set according to the dissemination channel environment, and the determination processing precision of raising use threshold value is possible.And, even when carrier wave-interferences (Carrier-to-Interference CI) when low, but is the optimum setting because of threshold value, also is possible so accurately detect initial synchronization time.
(embodiment 8)
Figure 20 is the block diagram according to the frame-synchronizing device of the embodiment of the invention 8.In addition, the basic structure of this frame-synchronizing device is similar to frame-synchronizing device shown in Figure 180, and therefore, similarly structure division is assigned identical label, and omits its explanation.
Present embodiment is characterised in that and comprises: the value of setting is judged part 1132, when threshold value according to relatively changing of relevant output not fixedly the time, whether the time data number that judgement is stored in the given time is lower than the value of setting; And threshold value correction portion 1134, when judging that the time data number stored in the given time is less than the value of setting, threshold value is proofreaied and correct.In this case, when judging that the time data number stored is less than the value of setting, use through the threshold value of overcorrect from beginning to control the initial synchronisation position.
At this, as the threshold value bearing calibration, begin threshold value is made as high value, and threshold value is carried out timing at every turn, judge that whether the time data number of being stored in the given time is less than the value of setting, when being lower than the value of setting, threshold value be multiply by the previous amplification factor of determining, and threshold value reduces some decibels.
To the operation of the frame-synchronizing device that comprises aforementioned structure be described below.
At first, the scheduled time received signal that receives from antenna is input to the relevant output test section 1110, and detect the relevant output of the scheduled time received signal of importing and synchronization character.In threshold determination part 1120a, relevant output and the threshold value (proofread and correct if exist, then be the threshold value after proofreading and correct) that is detected compared, and judge whether the relevant output that is detected surpasses threshold value.To be stored among the RAM of time data storage area 1130 as the pairing time data of relevant output that result of determination is judged to be above threshold value.
Then, the value of setting judgement part 1132 judges that whether the time data number of being stored in the given time is less than the value of setting.
And, with reference to result of determination, when the time data number of being stored in the given time during less than the value of setting, judge that then the time data number of being stored is little, and in threshold value correction portion 1134, threshold value be multiply by the previous amplification factor of determining, after threshold value reduces some decibels, use the threshold value after proofreading and correct to carry out initial synchronization once more from beginning.
On the other hand, when the time data of being stored in the given time outnumbers the value of setting, and judge when having stored time enough data number, in frequency distribution generating portion 1140, use the time data generated frequency of being stored to distribute.In peak frequency test section 1150, detect the peak frequency in institute's generated frequency distribution, and judge in the part 1152, judge that whether the peak frequency that is detected is less than standard value in standard value.
With reference to result of determination,, then judge initial synchronization time by error detection, and carry out initial synchronization once more from beginning when the peak frequency that is detected during less than standard value.
On the other hand, when peak frequency value of being above standard of being detected, in initial synchronization time test section 1160, will be made as initial synchronization time corresponding to the time of detection peak frequency.
Therefore, frame-synchronizing device according to present embodiment, when detecting initial synchronization time, after the time data number and the value of setting relatively stored, judge the store status of time data, because when store status is bad, carry out initial synchronization once more from beginning, thus can optimal threshold be set according to the dissemination channel environment, and the determination processing precision of raising use threshold value is possible.And, when CI when low because threshold value is optimum the setting, be possible so accurately detect initial synchronization time.
In addition, though whether in the value of setting is judged part 1132, carry out the low standard that compares to determine of standard value, might not be subject to this, and can use any standard that compares to determine that whether reaches standard value according to present embodiment.
(embodiment 9)
Figure 21 is the block diagram according to the frame-synchronizing device of the embodiment of the invention 9.And the basic structure of this frame-synchronizing device is similar to frame-synchronizing device shown in Figure 180, and therefore, similarly structure division is assigned identical label, and omits its explanation.
The invention is characterized in received signal strength indicator (the ReceivedSignal Strength Indicator that measures by use, RSSI) signal estimates that relevant output level is provided with optimal threshold, rather than use as previously mentioned with relevant export threshold value relatively is set, and proofread and correct employed setting at every turn.Specifically, it is characterised in that and comprises: RSSI signal measurement part 1112 is come measure R SSI signal; Relevant output estimating part 1114 is estimated relevant output level according to the RSSI signal of measuring; And threshold setting portion 1116 is provided with optimal threshold according to estimated relevant output level.
To the operation of the frame-synchronizing device that comprises aforementioned structure be described below.
At first, the scheduled time received signal that receives from antenna is input to the relevant output test section 1110, and detect the relevant output of the scheduled time received signal of importing and synchronization character.
Then, in RSSI signal measurement part 1112, measure R SSI signal, and in relevant output estimating part 1114, estimate relevant output level according to the RSSI signal of measuring.Next step in threshold setting portion 1116, is provided with optimal threshold according to estimated relevant output level.
In addition, in threshold determination part 1120b, relevant output and the set threshold value that is detected compared, and judge whether the relevant output that is detected surpasses threshold value.Then, will be stored among the RAM of time data storage area 1130 as the pairing time data of relevant output that result of determination is judged to be above threshold value.
And, in frequency distribution generating portion 1140, use the time data generated frequency of being stored to distribute.Then, in peak frequency test section 1150, detect the peak frequency in institute's generated frequency distribution, and judge in the part 1152, judge that whether the peak frequency that is detected is less than standard value in standard value.
With reference to result of determination,, then judge initial synchronization time by error detection, and carry out initial synchronization once more from beginning when the peak frequency that is detected during less than standard value.
When peak frequency value of being above standard of being detected, in initial synchronization time test section 1160, will be made as initial synchronization time corresponding to the time of detection peak frequency.
Therefore, according to present embodiment frame-synchronizing device after RSSI signal that use is measured is estimated relevant output level, threshold value optimally is set, thereby, can optimal threshold be set according to the dissemination channel environment, and the determination processing precision of raising use threshold value is possible.And, because determining optimal threshold, the RSSI signal that basis is measured only carries out single treatment, therefore can reduce the processing time that threshold value is determined.
Frame-synchronizing device of the present invention can be realized in the communication terminal (mobile station apparatus) of digital mobile communication system or base station apparatus.Thereby, obtain synchronously and follow the tracks of synchronously owing to can accurately carry out, therefore the good communication between communication terminal and the base station apparatus can be provided.
The invention is not restricted to previous embodiment, and can carry out various modifications without departing from the present invention.
As mentioned above, frame-synchronizing device of the present invention can accurately be carried out and obtain synchronously and follow the tracks of synchronously.In addition, frame-synchronizing device of the present invention can minimize hardware size.
The application is based on Japanese patent application 2001-117304 number and Japanese patent application 2001-127484 number of submitting to April 25 calendar year 2001 of submission on April 16 calendar year 2001, and is at this that its full content is incorporated by reference.
Commercial Application
The present invention can be applicable to carry out the situation of obtaining synchronously and following the tracks of synchronously with correlation technique.
Claims (6)
1. frame-synchronizing device comprises:
Relevant output test section is used to detect the received signal of the scheduled time and the relevant output of synchronization character;
The threshold determination part is used to judge that whether the relevant output that is detected is greater than threshold value;
The time data storage area is used to store the pairing time data of relevant output that is defined as greater than threshold value;
The frequency distribution generating portion is used to use the time data generated frequency of being stored to distribute;
The peak frequency test section is used for detecting the peak frequency of the frequency distribution that is generated;
The initial synchronization time test section, the time that is used for the peak frequency that will be detected is appointed as initial synchronization time;
Standard value is judged part, is used to judge whether the peak frequency that is detected is lower than standard value;
The threshold value correction portion is used for when judging that the peak frequency that is detected is lower than standard value threshold value being proofreaied and correct; And
Control section is used to use the threshold value through overcorrect to carry out initial synchronization once more from beginning.
2. frame-synchronizing device comprises:
Relevant output test section is used to detect the received signal of the scheduled time and the relevant output of synchronization character;
The threshold determination part is used to judge that whether the relevant output that is detected is greater than threshold value;
The time data storage area is used to store the pairing time data of relevant output that is defined as greater than threshold value;
The frequency distribution generating portion is used to use the time data generated frequency of being stored to distribute;
The peak frequency test section is used for detecting the peak frequency of the frequency distribution that is generated;
The initial synchronization time test section, the time that is used for the peak frequency that will be detected is appointed as initial synchronization time;
The value of setting is judged part, is used to judge whether the time data number of being stored is lower than the value of setting;
The threshold value correction portion is used for when judging that the time data number of being stored is lower than the value of setting threshold value being proofreaied and correct; And
Control section is used to use the threshold value through overcorrect to carry out initial synchronization once more from beginning.
3. a communication terminal comprises claim 1 or 2 described frame-synchronizing devices.
4. a base station apparatus comprises claim 1 or 2 described frame-synchronizing devices.
5. frame synchornization method comprises:
Relevant output detects step, is used to detect the received signal of the scheduled time and the relevant output of synchronization character;
The threshold determination step is used to judge that whether the relevant output that is detected is greater than threshold value;
The time data storing step is used to store the pairing time data of relevant output that is defined as greater than threshold value;
Frequency distribution generates step, is used to use the time data generated frequency of being stored to distribute;
Peak frequency detects step, is used for detecting the peak frequency of the frequency distribution that is generated;
Initial synchronization time detects step, and the time that is used for the peak frequency that will be detected is appointed as initial synchronization time;
The standard value determination step is used to judge whether the peak frequency that is detected is lower than standard value;
The threshold value aligning step is used for when judging that the peak frequency that is detected is lower than standard value threshold value being proofreaied and correct; And
Controlled step is used to use the threshold value through overcorrect to carry out initial synchronization once more from beginning.
6. frame synchornization method comprises:
Relevant output detects step, is used to detect the received signal of the scheduled time and the relevant output of synchronization character;
The threshold determination step is used to judge that whether the relevant output that is detected is greater than threshold value;
The time data storing step is used to store the pairing time data of relevant output that is defined as greater than threshold value;
Frequency distribution generates step, is used to use the time data generated frequency of being stored to distribute;
Peak frequency detects step, is used for detecting the peak frequency of the frequency distribution that is generated;
Initial synchronization time detects step, and the time that is used for the peak frequency that will be detected is appointed as initial synchronization time;
The value of setting determination step is used to judge whether the time data number of being stored is lower than the value of setting;
The threshold value aligning step is used for when judging that the time data number of being stored is lower than the value of setting threshold value being proofreaied and correct; And
Controlled step is used to use the threshold value through overcorrect to carry out initial synchronization once more from beginning.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001117304A JP3497484B2 (en) | 2001-04-16 | 2001-04-16 | Frame synchronization apparatus and frame synchronization method |
| JP117304/01 | 2001-04-16 | ||
| JP127484/01 | 2001-04-25 |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN02801234A Division CN1461543A (en) | 2001-04-16 | 2002-04-12 | Frame synchronization apparatus and frame synchronization method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1822537A true CN1822537A (en) | 2006-08-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006100067261A Pending CN1822537A (en) | 2001-04-16 | 2002-04-12 | Frame synchronization apparatus and frame synchronization method |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3497484B2 (en) |
| CN (1) | CN1822537A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101425121B (en) * | 2007-11-01 | 2011-04-20 | 中兴通讯股份有限公司 | Information transmission method in radio frequency recognition system |
| CN101252565B (en) * | 2008-03-28 | 2012-05-02 | 杭州国芯科技股份有限公司 | Rapid frame synchronization method |
| CN101622841B (en) * | 2007-02-15 | 2013-11-06 | 诺基亚公司 | Interference variance estimation for signal detection |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3946087B2 (en) * | 2002-05-23 | 2007-07-18 | 三菱電機株式会社 | Communication system, receiver, and communication method |
| KR20050006395A (en) * | 2003-07-08 | 2005-01-17 | 삼성전자주식회사 | Method and Apparutus for detecting synchronization signal |
| US7924952B2 (en) | 2004-05-20 | 2011-04-12 | Panasonic Corporation | Signal detection device, signal detection circuit, signal detection method, and program |
| JP4972508B2 (en) * | 2007-09-27 | 2012-07-11 | 京セラ株式会社 | Base station equipment |
-
2001
- 2001-04-16 JP JP2001117304A patent/JP3497484B2/en not_active Expired - Fee Related
-
2002
- 2002-04-12 CN CNA2006100067261A patent/CN1822537A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101622841B (en) * | 2007-02-15 | 2013-11-06 | 诺基亚公司 | Interference variance estimation for signal detection |
| CN101425121B (en) * | 2007-11-01 | 2011-04-20 | 中兴通讯股份有限公司 | Information transmission method in radio frequency recognition system |
| CN101252565B (en) * | 2008-03-28 | 2012-05-02 | 杭州国芯科技股份有限公司 | Rapid frame synchronization method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3497484B2 (en) | 2004-02-16 |
| JP2002314520A (en) | 2002-10-25 |
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