CN101534280A - Timing synchronous receiving method and device thereof - Google Patents
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- CN101534280A CN101534280A CN200910082172A CN200910082172A CN101534280A CN 101534280 A CN101534280 A CN 101534280A CN 200910082172 A CN200910082172 A CN 200910082172A CN 200910082172 A CN200910082172 A CN 200910082172A CN 101534280 A CN101534280 A CN 101534280A
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Abstract
The invention discloses a timing synchronous receiving method, comprising the steps of sustainedly receiving and buffering an input signal, making a delay self-correlation operation which delays the time of one PN sequence on the received input signal, carrying out the sliding calculation of correlation value and energy value in a preset correlation time, making a normalization operation on the correlation value and the energy value to obtain the normalized correlation value; determining whether the obtained normalized correlation value meets the condition of being greater than a correlation peak threshold or not, and determining whether the difference between the obtained normalized correlation value and the normalized correlation value which is relatively obtained before a period of time meets the condition of being less than a correlation peak slope threshold, if so, the conversion treatment from time domain to frequency domain is carried out on the input signal. The invention further discloses a timing synchronous receiving device which can greatly reduce the operation quantity for timing synchronous receiving and save the storage space.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of based on PN (Pseudorandom Noise, pseudorandom) timing synchronous receiving method and the device thereof of the OFDM of sequence (Orthogonal Frequency Division Multiplexing, OFDM) system.
Background technology
At present, the OFDM technology is successful Application in communicator, and is chosen as the core modulation-demodulation technique of next generation mobile communication.But, because ofdm system is relatively more responsive to timing offset,, can bring very big influence, so need utilize various synchronized algorithms accurately to obtain synchronizing information to eliminate synchronous error to whole device performance if there are error in slot synchronization and sign synchronization.
Timing synchronized algorithm in a lot of ofdm systems all needs to carry out synchronously thick and synchronously thin, specifically, will do the time-delay auto-correlation to input signal earlier calculates, and according to the correlation computations result judge reach a peak value after, begin to accept data with this position and simultaneously the data that receive are done local computing cross-correlation with the local PN sequence that prestores, its treatment step is more loaded down with trivial details.In addition, if when this PN sequence is longer, when the auto-correlation of delaying time is calculated, need be also more in the data of local cache, need be also longer when carrying out local computing cross-correlation in the PN sequence of this locality storage, cause memory space big, it is also big to carry out synchronous operand.
Hence one can see that, when existing ofdm system based on PN to carry out timing in the prior art to receive synchronously, needs data quantity stored more always, and operand is big, the computing complicated problems.
Summary of the invention
The technical problem to be solved in the present invention is to propose a kind of timing synchronous receiving method and device thereof, be applied to based on the timing of the ofdm system of PN sequence synchronous, in order to solve carry out in the prior art timing synchronously the time operand big, take the problem more than the memory space.
In order to solve the problems of the technologies described above, the present invention proposes a kind of timing synchronous receiving method, comprises step:
Continue to receive and the buffer memory input signal, it is the time-delay auto-correlation computation of a PN sequence duration that the input signal that receives is done time-delay, slide and calculate a relevant duration that presets interior correlation and energy value, and do the normalization computing of correlation and energy value, to obtain normalized correlation;
Judge whether whether the described normalized correlation that obtains satisfies greater than the difference of the normalized correlation that obtains before a related peak threshold value and the described normalization correlation that obtains and the relative one section duration satisfied with a relevant peaks slope threshold value, if all satisfy, then input signal carried out the conversion process of time domain to frequency domain.
Further, said method also can have following characteristics:
The described relevant duration that presets is not more than the poor of the duration of a PN sequence and maximum multipath time-delay, and described maximum multipath time-delay is to obtain by gathering the mode that great amount of samples adds up;
The two normalized correlations duration apart of the described subtraction of delaying time is less than the described relevant duration that presets.
Further, said method also can have following characteristics:
The two normalized correlations duration apart of the described subtraction of delaying time is 1/8 of the described relevant duration that presets.
Further, said method also can have following characteristics:
When the normalization computing of doing correlation and energy value, respectively correlation and energy value are carried out the computing of delivery side earlier, and then be divided by, to obtain normalized correlation.
Further, said method also can have following characteristics:
Before the normalization computing of doing correlation and energy value, also correlation and energy value are carried out the mean filter processing respectively; Perhaps after the normalization computing of doing correlation and energy value, also the normalized correlation that obtains is done mean filter and handle.
Further, said method also can have following characteristics:
Described related peak threshold value is recently to be provided with according to the minimum noise that allows to insert, and whether the normalized correlation that obtains in order to judgement reaches peak value, thereby judges whether to capture abundant useful signal;
Described relevant peaks slope threshold value is to receive that according to the receiver of setting the percentage that the energy of data need account for gross energy recently sets, and whether the normalized correlation that obtains in order to judgement forms a platform, thereby judges whether last footpath arrives.
Further, said method also can have following characteristics:
Judging the described normalized correlation that obtains greater than the difference of the normalized correlation that obtains before a related peak threshold value and the described normalization correlation that obtains and the relative one section duration during less than a relevant peaks slope threshold value, delay time a period of time earlier, and then input signal is carried out the conversion process of time domain to frequency domain; The time of described time-delay receives that according to the receiver of setting the percentage that the energy of data need account for gross energy recently sets.
In order to solve the problems of the technologies described above, the present invention also proposes the synchronous receiving system of a kind of timing, comprises the receiver module, Domain Synchronous module and the frequency domain processing module that link to each other successively, wherein:
Described receiver module sends to described Domain Synchronous module behind the receiving inputted signal;
Described Domain Synchronous module, receive and the buffer memory input signal, it is the auto-correlation computation of a PN sequence duration that the input signal that receives is done time-delay, slide to calculate correlation and energy value in the relevant duration that presets, and the normalization computing of doing correlation and energy value is to obtain normalized correlation; The difference of the normalized correlation that obtains before one section duration of the normalized correlation that calculates and relative this normalized correlation, judge whether the difference calculate satisfies less than a relevant peaks slope threshold value and described normalized correlation and whether satisfy, if all satisfy then control described frequency domain processing module and carry out the conversion process of time domain to frequency domain greater than a related peak threshold value;
Described frequency domain processing module, under the control of described Domain Synchronous module, receiving inputted signal and it is carried out the conversion process of time domain to frequency domain from described receiver module.
Further, the synchronous receiving system of above-mentioned timing also can have following characteristics:
Described Domain Synchronous module comprises relevant sub-module, quantum of energy module, normalization submodule and judgement submodule, wherein:
Described relevant sub-module, from described receiver module, receive and the buffer memory input signal, it is the auto-correlation computation of a PN sequence duration that the input signal that receives is done time-delay, slide and calculate the interior autocorrelation value of a relevant duration that presets, and the correlation that calculates is sent to described normalization submodule;
Described quantum of energy module, receiving inputted signal from described receiver module slides and calculates the energy value of the input signal in the described relevant duration that presets, and then the energy value that calculates is sent to described normalization submodule;
Described normalization submodule is done the normalization computing with correlation and energy value, and the normalized correlation that will calculate sends to described judgement submodule;
Described judgement submodule, from described normalization submodule, receive and the normalized correlation of buffer memory, after whenever receiving a normalized correlation, calculate the poor of the normalized correlation that receives before one section duration of relative described normalized correlation of described normalized correlation and buffer memory, judge whether the difference calculate satisfies less than a relevant peaks slope threshold value and described normalized correlation and whether satisfy, if all satisfy then control described frequency domain processing module and carry out the conversion process of time domain to frequency domain greater than a related peak threshold value.
Further, the synchronous receiving system of above-mentioned timing also can have following characteristics:
The described relevant duration that presets is not more than the poor of the duration of a PN sequence and maximum multipath time-delay, and described maximum multipath time-delay is to obtain by gathering the mode that great amount of samples adds up;
The two normalized correlations duration apart of the described subtraction of delaying time is less than the described relevant duration that presets.
Further, the synchronous receiving system of above-mentioned timing also can have following characteristics:
The two normalized correlations duration apart of the described subtraction of delaying time is 1/8 of the described relevant duration that presets.
Further, the synchronous receiving system of above-mentioned timing also can have following characteristics:
Described normalization submodule carries out the computing of delivery side to correlation and energy value respectively earlier, and then is divided by, to obtain normalized correlation when carrying out the normalization computing.
Further, the synchronous receiving system of above-mentioned timing also can have following characteristics:
Also comprise a filter, carry out Filtering Processing, and then send to described judgement submodule in order to the normalized correlation that described normalization submodule is calculated; Perhaps the energy value that calculates in order to correlation that described relevant sub-module is calculated and described quantum of energy module carries out Filtering Processing respectively, and then sends to described normalization submodule.
Further, the synchronous receiving system of above-mentioned timing also can have following characteristics:
Also comprise a timer;
Described judgement submodule is being judged the described normalized correlation that obtains greater than the difference of the normalized correlation that obtains before a related peak threshold value and the described normalization correlation that obtains and the relative one section duration during less than a relevant peaks slope threshold value, start described timer, timing receives that according to the receiver of setting the percentage that the energy of data need account for gross energy recently sets,, just control described frequency domain processing module and carry out the conversion process of time domain to constantly at timing to frequency domain.
Further, the synchronous receiving system of above-mentioned timing also can have following characteristics:
Described related peak threshold value is recently to be provided with according to the minimum noise that allows to insert, and whether the normalized correlation that obtains in order to judgement reaches peak value, thereby judges whether to capture abundant useful signal;
Described relevant peaks slope threshold value is to receive that according to the receiver of setting the percentage that the energy of data need account for gross energy recently sets, and whether the normalized correlation that obtains in order to judgement forms a platform, thereby judges whether last footpath arrives.
A kind of timing synchronous receiving method of the present invention and device thereof have significantly reduced the operand that regularly receives synchronously, need not carry out local computing cross-correlation, therefore also need not store a PN sequence in this locality in advance, have saved memory space; When delaying time auto-correlation computation relevant duration can be set as required, therefore can reduce the data volume of local cache; Computing is simpler, and operand is littler.
Description of drawings
Fig. 1 is a kind of timing synchronous receiving method flow chart of the embodiment of the invention.
Fig. 2 is a kind of timing synchronous receiving method flow chart of application example of the present invention.
Fig. 3 is the synchronous receiving system block diagram of a kind of timing of the embodiment of the invention.
Embodiment
The inventor is through examining, notice, in multipath channel, the arrival in each footpath all can make the time-delay autocorrelation value of input signal change, after last directly arrives, it is maximum that autocorrelation value will reach, and from then on form a platform, no longer change, therefore, propose a kind of timing synchronous receiving method of the embodiment of the invention and device thereof, receive synchronously in order to the timing of realization based on the ofdm system of PN sequence, it is conceived substantially: whether reach peak value by the normalized time-delay autocorrelation value of judging input signal, and whether form a platform judge last the footpath whether arrive.
Describe the present invention in detail below in conjunction with accompanying drawing.
With reference to figure 1, the figure shows a kind of timing synchronous receiving method of the embodiment of the invention, specifically comprise following steps:
Step S101: continue to receive and the buffer memory input signal;
Step S102: it is the time-delay auto-correlation computation of a PN sequence duration that the input signal that receives is done time-delay, slide and calculate a relevant duration that presets interior correlation and energy value, and do the normalization computing of correlation and energy value, to obtain normalized correlation;
The described relevant duration that presets should be not more than the poor of the duration of a PN sequence and maximum multipath time-delay, and this maximum multipath time-delay can obtain by gathering the mode that great amount of samples adds up.
In this step, when carrying out the normalization computing, can carry out the computing of delivery side to correlation and energy value respectively earlier, and then be divided by, obtaining normalized correlation, thereby can reduce operand effectively, improve the computing accuracy.
Step S103: the normalized correlation that obtains is done mean filter handle;
Carry out Filtering Processing and can effectively reduce the interference that noise causes, prevent the disconnected phenomenon of erroneous judgement, thereby further improve the accuracy of judging synchronously.
In another embodiment, carrying out Filtering Processing also can be to carry out before carrying out the normalization computing, promptly earlier respectively correlation and energy value is carried out Filtering Processing, then correlation after the Filtering Processing and energy value is done the normalization computing.
Step S104: judge that normalized correlation whether greater than a related peak threshold value, if judged result is a "Yes", then enters step S105; Otherwise, continue to judge next normalized correlation that obtains;
Described related peak threshold value is recently to be provided with according to the minimum noise that allows to insert, and whether the normalized correlation that obtains in order to judgement reaches peak value, thereby judges whether to capture abundant useful signal.
Described related peak threshold value can be set a lower limit, sets but this scope is the scope of the signal to noise ratio size that can receive when networking according to concrete device, and signal to noise ratio is more little, and this threshold value is just more little.When being 0db as the signal to noise ratio that allows, this threshold value just can be set at 0.4.
Step S105: calculate the poor of the normalized correlation that obtains before normalization correlation and the relative one section duration;
In this step, the two normalized correlations duration apart of the subtraction of delaying time should be less than the relevant duration that presets described in the step S102, and its value is preferably 1/8 of the described relevant duration that presets.
Step S106: judge that the difference that obtains whether less than a relevant peaks slope threshold value, if judged result is a "Yes", then enters step S107; Otherwise, continue to judge next difference that obtains;
The difference of the normalized correlation that obtains before the normalized correlation that this step obtains by judgement and the relative one section duration judges whether the normalized correlation that obtains has formed a platform, whether the slope that is relevant peaks is tending towards 0, thereby judges whether last footpath arrives.
Described relevant peaks slope threshold value is to receive that according to the receiver of setting the percentage that the energy of data need account for gross energy recently sets.Ideally, described relevant peaks slope threshold value should become 0, can assert that whole energy arrive, if allow 5% loss, considers noise jamming simultaneously, can set described relevant peaks slope threshold value and be 0.008 or 2-7 powers.
Step S107: postpone to begin receiving inputted signal and carry out the conversion process of time domain behind one section duration to frequency domain.
This delay duration is to receive that according to the receiver of setting the percentage that the energy of data need account for gross energy recently sets.For example, think that with 95% the situation that reaches all multipath gross energies normalized correlation has reached peak value and formed a platform, therefore in the actual channel environment a certain footpath energy less than 5% of gross energy, and delay time length causes intersymbol interference, after preferably can postponing a period of time again the receiving inputted signal line frequency territory of going forward side by side handle, thereby reduce to produce the probability of intersymbol interference, and the setting of this section period should not make the reception of signal cross late and exceeds the duration of CP (Cyclic Prefix of OFDM symbol).
For the long input signal of a PN sequence duration, adopt as above that method can reduce receiving demodulation chip amount of calculation and memory space greatly, be that an application example further specifies the present invention synchronously to carry out timing in the CMMB system below.
In the CMMB system input signal PN sequence duration be 2048 long, preferably, can adopt following method to carry out timing and receive synchronously, as shown in Figure 2, specifically comprise step:
Step S201: continue to receive and the buffer memory input signal;
Step S202: the input signal that receives is done the auto-correlation computation of 2048 of PN sequence durations of time-delay, and sliding and calculating duration be 512 interior correlation and the energy value of relevant duration for example:
Wherein:
The input signal of y (l) for receiving;
Y (l+2048) is 2048 input signals that receive of a PN sequence duration of time-delay;
γ (m) is y (l) and the correlation of y (l+2048) in 512 spot correlation durations;
Φ (m) is the energy value in 512 spot correlation durations;
512 only are a selectable scheme of application example of the present invention, certainly, can also get other values, as long as this value is not more than the duration of a PN sequence and the difference of maximum multipath time-delay, this maximum multipath time-delay can obtain by the mode that the collection great amount of samples is added up, and the present invention is not as restriction.
Step S203: employing one for example 16 mean filters is done the mean filter processing to correlation and energy value respectively;
Wherein, γ (m) does 16 mean filter processing to correlation;
Φ (m) does 16 mean filter processing to energy value;
Carry out Filtering Processing and can effectively reduce the interference that noise causes, prevent the disconnected phenomenon of erroneous judgement, thereby further improve the accuracy of judging synchronously.Adopting 16 mean filters to carry out Filtering Processing is selectable scheme of application example of the present invention, also can adopt other mean filters to realize, 24 mean filters for example, and the present invention is not as restriction.
Step S204: respectively correlation after Filtering Processing and energy value are carried out the computing of delivery side, do division arithmetic then, obtain normalized correlation;
Wherein, Λ (m) is normalized correlation;
Step S205: judge that the normalized correlation that obtains whether greater than a related peak threshold value, if judged result is a "Yes", then enters step S206; Otherwise, continue to judge next normalized correlation that obtains;
This step is in order to judging whether to capture abundant useful signal, and described related peak threshold value is recently to be provided with according to the minimum noise that allows to insert, and for example can be set to 0.7;
Step S206: the normalized correlation that the normalized correlation that calculates and relative one section duration for example receive before 64 durations poor;
D (m)=Λ (m)-people (m-64)
D (m) poor for to the normalized correlation that receives before normalized correlation and relative its 64 durations;
In this step, the two normalized correlations duration apart of the subtraction of delaying time should be less than the relevant duration described in the step S202, and its value is preferably 1/8 of described relevant duration, is 64 points in should be with example.Certainly, 64 only are a selectable scheme of application example of the present invention, also can get other values, as long as this value is no more than the relevant duration described in the step S202, the present invention is not as restriction.
Suitable to be preferably, its value excessive or too small all can cause judge inaccurate.
Step S207: judge that resulting difference whether less than a relevant peaks slope threshold value, if judged result is a "Yes", then enters step S208; Otherwise, continue to judge next difference that obtains;
The difference of the normalized correlation that obtains before the normalized correlation that this step obtains by judgement and the relative one section duration judges whether the normalized correlation that obtains has formed a platform, whether the slope that is relevant peaks is tending towards 0, thereby judges whether last footpath arrives.
Described relevant peaks slope threshold value is to receive that according to the receiver of setting the percentage that the energy of data need account for gross energy recently sets.Ideally, described relevant peaks slope threshold value should become 0, can assert that whole energy arrive, if allow 5% loss, considers noise jamming simultaneously, can set described relevant peaks slope threshold value and be 0.008 or 2-7 powers.
Step S208: begin receiving inputted signal after postponing a period of time and carry out the conversion process of time domain to frequency domain.
This delay duration is to receive that according to the receiver of setting the percentage that the energy of data need account for gross energy recently sets.For example, think that with 95% the situation that reaches all multipath gross energies normalized correlation has reached peak value and formed a platform, therefore in the actual channel environment a certain footpath energy less than 5% of gross energy, and delay time length causes intersymbol interference, after preferably can postponing a period of time again the receiving inputted signal line frequency territory of going forward side by side handle, thereby reduce to produce the probability of intersymbol interference, and the setting of this section period should not make the reception of signal cross late and exceeds the duration of CP (Cyclic Prefix of OFDM symbol).
By above-mentioned application example as can be known, after adopting the present invention, receive synchronously for carrying out timing in the CMMB system, need not carry out local computing cross-correlation, therefore the PN sequence that also need not prestore in this locality, and also only need carry out 512 related operation when carrying out auto-correlation computation needs to carry out 2048 auto-correlation computation in compared to prior art, significantly reduce operand, had its outstanding advantage.
In order to realize above-mentioned timing synchronous receiving method, the embodiment of the invention also proposes the synchronous receiving system of a kind of timing, with reference to figure 3, comprises the receiver module 31, Domain Synchronous module 32 and the frequency domain processing module 33 that link to each other successively, wherein:
Wherein, described related peak threshold value is recently to be provided with according to the minimum noise that allows to insert, and whether the normalized correlation that obtains in order to judgement reaches peak value, thereby judges whether to capture abundant useful signal; Described relevant peaks slope threshold value is to receive that according to the receiver of setting the percentage that the energy of data need account for gross energy recently sets, and whether the normalized correlation that obtains in order to judgement forms a platform, thereby judges whether last footpath arrives.
Frequency domain processing module 33, under the control of Domain Synchronous module 32, receiving inputted signal and it is carried out the conversion process of time domain to frequency domain from receiver module 31.
Relevant sub-module 321, from receiver module 31, receive and the buffer memory input signal, it is the auto-correlation computation of a PN sequence duration that the input signal that receives is done time-delay, slides and calculates the interior correlation of a relevant duration that presets, and the correlation that calculates is sent to normalization submodule 323.
Quantum of energy module 322, receiving inputted signal from receiver module 31 slides and calculates the energy value of the input signal in the described relevant duration that presets, and then the energy value that calculates is sent to normalization submodule 323.
The described relevant duration that presets should be not more than the poor of the duration of a PN sequence and maximum multipath time-delay, and this maximum multipath time-delay can be obtained by gathering the mode that great amount of samples adds up.
Preferably, normalization submodule 323 can also earlier carry out the computing of delivery side to correlation and energy value respectively when carrying out the normalization computing, and then with both divided by obtaining normalized correlation, thereby can reduce the operand when carrying out the normalization computing, improve the computing accuracy.
The two normalized correlations duration apart of the described subtraction of delaying time should be less than the described relevant duration that presets, and its value is preferably 1/8 of the described relevant duration that presets.
The purpose that the increase filter carries out Filtering Processing is to judge disconnected phenomenon by accident in order to reduce the interference that noise causes, to prevent, thereby further improves the accuracy of synchronous judgement.
Though embodiment proposed by the invention and execution mode are as above, described content is not to be used for directly limiting scope of patent protection of the present invention.Any personnel that have common technological know-how in the technical field of the invention under the prerequisite that does not break away from spirit and scope proposed by the invention, can do some changes on the formal and details of implementing.Scope of patent protection of the present invention still must be defined with the appending claims scope and is as the criterion.
Claims (15)
1, a kind of timing synchronous receiving method is characterized in that, comprises step:
Continue to receive and the buffer memory input signal, it is the time-delay auto-correlation computation of a PN sequence duration that the input signal that receives is done time-delay, slide and calculate a relevant duration that presets interior correlation and energy value, and do the normalization computing of correlation and energy value, to obtain normalized correlation;
Judge whether whether the described normalized correlation that obtains satisfies greater than the difference of the normalized correlation that obtains before a related peak threshold value and the described normalization correlation that obtains and the relative one section duration satisfied with a relevant peaks slope threshold value, if all satisfy, then input signal carried out the conversion process of time domain to frequency domain.
2, the method for claim 1 is characterized in that:
The described relevant duration that presets is not more than the poor of the duration of a PN sequence and maximum multipath time-delay, and described maximum multipath time-delay is to obtain by gathering the mode that great amount of samples adds up;
The two normalized correlations duration apart of the described subtraction of delaying time is less than the described relevant duration that presets.
3, method as claimed in claim 2 is characterized in that:
The two normalized correlations duration apart of the described subtraction of delaying time is 1/8 of the described relevant duration that presets.
4, the method for claim 1 is characterized in that:
When the normalization computing of doing correlation and energy value, respectively correlation and energy value are carried out the computing of delivery side earlier, and then be divided by, to obtain normalized correlation.
5, the method for claim 1 is characterized in that:
Before the normalization computing of doing correlation and energy value, also correlation and energy value are carried out the mean filter processing respectively; Perhaps after the normalization computing of doing correlation and energy value, also the normalized correlation that obtains is done mean filter and handle.
6, the method for claim 1 is characterized in that:
Described related peak threshold value is recently to be provided with according to the minimum noise that allows to insert, and whether the normalized correlation that obtains in order to judgement reaches peak value, thereby judges whether to capture abundant useful signal;
Described relevant peaks slope threshold value is to receive that according to the receiver of setting the percentage that the energy of data need account for gross energy recently sets, and whether the normalized correlation that obtains in order to judgement forms a platform, thereby judges whether last footpath arrives.
7, the method for claim 1 is characterized in that:
Judging the described normalized correlation that obtains greater than the difference of the normalized correlation that obtains before a related peak threshold value and the described normalization correlation that obtains and the relative one section duration during less than a relevant peaks slope threshold value, delay time a period of time earlier, and then input signal is carried out the conversion process of time domain to frequency domain; The time of described time-delay receives that according to the receiver of setting the percentage that the energy of data need account for gross energy recently sets.
8, the synchronous receiving system of a kind of timing is characterized in that, comprises the receiver module, Domain Synchronous module and the frequency domain processing module that link to each other successively, wherein:
Described receiver module sends to described Domain Synchronous module behind the receiving inputted signal;
Described Domain Synchronous module, receive and the buffer memory input signal, it is the auto-correlation computation of a PN sequence duration that the input signal that receives is done time-delay, slide to calculate correlation and energy value in the relevant duration that presets, and the normalization computing of doing correlation and energy value is to obtain normalized correlation; The difference of the normalized correlation that obtains before one section duration of the normalized correlation that calculates and relative this normalized correlation, judge whether the difference calculate satisfies less than a relevant peaks slope threshold value and described normalized correlation and whether satisfy, if all satisfy then control described frequency domain processing module and carry out the conversion process of time domain to frequency domain greater than a related peak threshold value;
Described frequency domain processing module, under the control of described Domain Synchronous module, receiving inputted signal and it is carried out the conversion process of time domain to frequency domain from described receiver module.
9, device as claimed in claim 8 is characterized in that, described Domain Synchronous module comprises relevant sub-module, quantum of energy module, normalization submodule and judgement submodule, wherein:
Described relevant sub-module, from described receiver module, receive and the buffer memory input signal, it is the auto-correlation computation of a PN sequence duration that the input signal that receives is done time-delay, slide and calculate the interior autocorrelation value of a relevant duration that presets, and the correlation that calculates is sent to described normalization submodule;
Described quantum of energy module, receiving inputted signal from described receiver module slides and calculates the energy value of the input signal in the described relevant duration that presets, and then the energy value that calculates is sent to described normalization submodule;
Described normalization submodule is done the normalization computing with correlation and energy value, and the normalized correlation that will calculate sends to described judgement submodule;
Described judgement submodule, from described normalization submodule, receive and the normalized correlation of buffer memory, after whenever receiving a normalized correlation, calculate the poor of the normalized correlation that receives before one section duration of relative described normalized correlation of described normalized correlation and buffer memory, judge whether the difference calculate satisfies less than a relevant peaks slope threshold value and described normalized correlation and whether satisfy, if all satisfy then control described frequency domain processing module and carry out the conversion process of time domain to frequency domain greater than a related peak threshold value.
10, install as claimed in claim 8 or 9, it is characterized in that:
The described relevant duration that presets is not more than the poor of the duration of a PN sequence and maximum multipath time-delay, and described maximum multipath time-delay is to obtain by gathering the mode that great amount of samples adds up;
The two normalized correlations duration apart of the described subtraction of delaying time is less than the described relevant duration that presets.
11, device as claimed in claim 10 is characterized in that:
The two normalized correlations duration apart of the described subtraction of delaying time is 1/8 of the described relevant duration that presets.
12, device as claimed in claim 9 is characterized in that:
Described normalization submodule carries out the computing of delivery side to correlation and energy value respectively earlier, and then is divided by, to obtain normalized correlation when carrying out the normalization computing.
13, device as claimed in claim 9 is characterized in that, also comprises a filter, wherein:
Described filter carries out Filtering Processing in order to the normalized correlation that described normalization submodule is calculated, and then sends to described judgement submodule; Perhaps the energy value that calculates in order to correlation that described relevant sub-module is calculated and described quantum of energy module carries out Filtering Processing respectively, and then sends to described normalization submodule.
14, device as claimed in claim 9 is characterized in that, also comprises a timer:
Described judgement submodule is being judged the described normalized correlation that obtains greater than the difference of the normalized correlation that obtains before a related peak threshold value and the described normalization correlation that obtains and the relative one section duration during less than a relevant peaks slope threshold value, start described timer, timing receives that according to the receiver of setting the percentage that the energy of data need account for gross energy recently sets,, just control described frequency domain processing module and carry out the conversion process of time domain to constantly at timing to frequency domain.
15, install as claimed in claim 8 or 9, it is characterized in that:
Described related peak threshold value is recently to be provided with according to the minimum noise that allows to insert, and whether the normalized correlation that obtains in order to judgement reaches peak value, thereby judges whether to capture abundant useful signal;
Described relevant peaks slope threshold value is to receive that according to the receiver of setting the percentage that the energy of data need account for gross energy recently sets, and whether the normalized correlation that obtains in order to judgement forms a platform, thereby judges whether last footpath arrives.
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