CN102394854A - Frequency capturing method and device of broadcast positioning signal - Google Patents
Frequency capturing method and device of broadcast positioning signal Download PDFInfo
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- CN102394854A CN102394854A CN2011102878765A CN201110287876A CN102394854A CN 102394854 A CN102394854 A CN 102394854A CN 2011102878765 A CN2011102878765 A CN 2011102878765A CN 201110287876 A CN201110287876 A CN 201110287876A CN 102394854 A CN102394854 A CN 102394854A
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Abstract
The invention discloses a frequency capturing method and device of a broadcast positioning signal, belonging to the communication field. The frequency capturing method of the broadcast positioning signal is applied to a pre-set slot time section of the broadcast positioning signal and comprises the following steps of: generating a local code, wherein the phase of the local code is the same as that of the broadcast positioning signal; multiplying the broadcast positioning signal with the local code to generate a first signal; carrying out a down-conversion operation and an integral operation on n carrier signals with different frequencies and the first signal to generate n relative results, wherein the n relative results correspond to n different frequencies and n is a positive integer; comparing the n relative results to obtain a maximum relative result; and using a frequency corresponding to the maximum result as the frequency of the broadcast positioning signal so as to capture the frequency of the broadcast positioning signal. According to the method provided by the embodiment of the invention, the capturing error rate of the frequency is reduced and the frequency capturing speed is accelerated.
Description
Technical field
The present invention relates to the communications field, particularly a kind of frequency capture method and device of broadcasting framing signal.
Background technology
In recent years, people grow with each passing day to the pinpoint demand of indoor and outdoor, and particularly when the reply emergency, accurately the location seems more and more important; Existing location technology comprises GPS (Global Positioning System, global positioning system) location, based on the location of mobile base station etc.
The broadcasting framing signal is at original OFDM (Orthogonal Frequency Division Multiplexing; OFDM) CDMA (the Code Division Multiple Access that superposeed on the broadcast singal; Code division multiple access) mixed signal of spread-spectrum location signal; As shown in Figure 1, Fig. 1 is the structural representation of a time slot of the broadcasting framing signal that provides of prior art.As can beappreciated from fig. 1, superpose flat-out CDMA spreading code as harbour, be lower than the superimposed code of harbour 20dB in the remainder stack of time slot at 136 a μ s of the time slot of broadcasting framing signal.Receiving terminal need be caught the frequency of said broadcasting framing signal in order to realize positioning function after receiving said broadcasting framing signal.
Prior art provides a kind of frequency and phase acquisition method, is specially: the time slot that broadcast base station will be broadcasted framing signal is divided into a plurality of predetermined time slot sections; Receiver carries out multiplying with the broadcasting framing signal of the predetermined time slot section that receives with this machine reproduction signal (comprising the local carrier of carrier generator generation and the local code that code generator produces); And then carry out integral operation, quadratic sum computing, finally obtain the correlated results of said broadcasting framing signal and this machine reproduction signal; Because when the broadcasting framing signal had consistent frequency and code phase with this machine reproduction signal, the value of said correlated results was maximum; Therefore can obtain the frequency and the code phase of said broadcasting framing signal according to the maximum in the said correlated results; Receiver successively receives the broadcasting framing signal of different predetermined time slot sections in the prior art, obtains said correlated results according to the broadcasting framing signal of said different predetermined time slot sections.
But the broadcasting framing signal of prior art not only comprises CDMA spread-spectrum location signal and also comprises the OFDM broadcast singal; And the strong 20dB of power of the said CDMA spread-spectrum location of the power ratio of said OFDM broadcast singal signal; The power of OFDM broadcast singal is also different in the broadcasting framing signal of different predetermined time slot sections; Therefore the comparativity of the correlated results that obtains of prior art is poor; The frequency of obtaining according to the correlated results of maximum not necessarily is exactly the frequency of said broadcasting framing signal, makes the mistake rate of catching of frequency improve.
Summary of the invention
For the mistake that reduces frequency is caught rate, the embodiment of the invention provides a kind of frequency capture method and device of broadcasting framing signal.Said technical scheme is following:
A kind of frequency capture method of broadcasting framing signal, said method are applied to broadcast a predetermined time slot section of framing signal, comprising:
Produce the local code consistent, said broadcasting framing signal and said local code execution multiplying are generated first signal with the code phase of said broadcasting framing signal;
N carrier signal of different frequency carried out down-conversion computing and integral operation with said first signal respectively, generate n correlated results, wherein said n corresponding n different frequency of correlated results, n is a positive integer;
A said n correlated results is compared, obtain maximum correlated results;
The frequency that the correlated results of said maximum is corresponding is as the frequency of said broadcasting framing signal, thereby catches the frequency of said broadcasting framing signal.
A kind of frequency acquisition device of broadcasting framing signal, said device are applied to broadcast a predetermined time slot section of framing signal, comprising:
The local code generator is used to produce the local code consistent with the code phase of said broadcasting framing signal;
First multiplier is used for said broadcasting framing signal and said local code execution multiplying are generated first signal;
The down-conversion integral unit is used for n carrier signal of different frequency carried out down-conversion computing and integral operation with said first signal respectively, generates n correlated results, wherein said n corresponding n different frequency of correlated results, and n is a positive integer;
Comparator is used for a said n correlated results is compared, and obtains maximum correlated results;
The frequency acquisition device is used for the frequency of the frequency that the correlated results of said maximum is corresponding as said broadcasting framing signal, thereby catches the frequency of said broadcasting framing signal.
The beneficial effect that the technical scheme that the embodiment of the invention provides is brought is: the embodiment of the invention is the frequency acquisition that carries out to the broadcasting framing signal of a predetermined time slot section; The power invariability of the ofdm signal on the broadcasting framing signal of a predetermined time slot section; Therefore the correlated results that obtains through the method for present embodiment only has direct relation with the frequency of carrier signal; Do not receive the influence of ofdm signal, the correlated results that obtains according to the broadcasting framing signal of different predetermined time slot sections in the prior art of comparing, the comparativity of the correlated results that present embodiment obtains is strong; Can capture correct frequency according to said correlated results, make the mistake rate of catching of frequency reduce.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention; The accompanying drawing of required use is done to introduce simply in will describing embodiment below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of a time slot of the broadcasting framing signal that provides of prior art;
Fig. 2 is a kind of flow chart of broadcasting the frequency capture method embodiment of framing signal that the embodiment of the invention 1 provides;
Fig. 3 is a kind of flow chart of broadcasting the frequency capture method embodiment of framing signal that the embodiment of the invention 2 provides;
Fig. 4 is a kind of structural representation of broadcasting the frequency acquisition device embodiment of framing signal that the embodiment of the invention 3 provides;
Fig. 5 is a kind of first structural representation of broadcasting the frequency acquisition device embodiment of framing signal that the embodiment of the invention 4 provides;
Fig. 6 is the mutual sketch map of internal information of the down-conversion integration subelement that provides of the embodiment of the invention 4.
Fig. 7 is a kind of second structural representation of broadcasting the frequency acquisition device embodiment of framing signal that the embodiment of the invention 4 provides.
Embodiment
The embodiment of the invention provides a kind of frequency capture method and device of broadcasting framing signal.
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that embodiment of the present invention is done to describe in detail further below.
Embodiment 1
With reference to figure 2, Fig. 2 is a kind of flow chart of broadcasting the frequency capture method embodiment of framing signal that the embodiment of the invention 1 provides; The frequency capture method of said broadcasting framing signal is applied to broadcast a predetermined time slot section of framing signal, comprising:
S101: produce the local code consistent, said broadcasting framing signal and said local code execution multiplying are generated first signal with the code phase of said broadcasting framing signal.
S102: n carrier signal of different frequency carried out down-conversion computing and integral operation with said first signal respectively, generate n correlated results, wherein said n corresponding n different frequency of correlated results, n is a positive integer.
S103: a said n correlated results is compared, obtain maximum correlated results.
S104: the frequency that the correlated results of said maximum is corresponding is as the frequency of said broadcasting framing signal, thereby catches the frequency of said broadcasting framing signal.
Executive agent in the present embodiment can be terminals such as mobile phone, palm TV, but is not limited thereto, and repeats no more at this.
Present embodiment is the frequency acquisition that carries out to the broadcasting framing signal of a predetermined time slot section; The power invariability of the ofdm signal on the broadcasting framing signal of a predetermined time slot section; Therefore the correlated results that obtains through the method for present embodiment only has direct relation with the frequency of carrier signal; Do not receive the influence of ofdm signal, the correlated results that obtains according to the broadcasting framing signal of different predetermined time slot sections in the prior art of comparing, the comparativity of the correlated results that present embodiment obtains is strong; Can capture correct frequency according to said correlated results, make the mistake rate of catching of frequency reduce.
Embodiment 2
With reference to Fig. 3, Fig. 3 is a kind of flow chart of broadcasting the frequency capture method embodiment of framing signal that the embodiment of the invention 2 provides; The frequency capture method of said broadcasting framing signal is applied to broadcast a predetermined time slot section of framing signal, comprising:
S201: receive said broadcasting framing signal.
In the practical application, a time slot of broadcasting framing signal is 25ms, and broadcast base station is divided into a plurality of predetermined time slot sections with a time slot of said broadcasting framing signal; The length of said predetermined time slot section can be confirmed by broadcast base station, and the length of said predetermined time slot section is at least greater than the harbour length of a time slot of said broadcasting framing signal; For example: broadcast base station is divided into a time slot of said broadcasting framing signal the broadcasting framing signal of 10 predetermined time slot sections; The length of said predetermined time slot section is 2.5ms; The length of the section of predetermined time slot described in the present embodiment is not limited thereto, and repeats no more at this.
Broadcast base station is sent to the terminal with the broadcasting framing signal of said predetermined time slot section, and said terminal receives the broadcasting framing signal of said predetermined time slot section.
S202: the code phase of catching said broadcasting framing signal according to parallel correlator.
After the terminal receives the broadcasting framing signal of said predetermined time slot section; According to parallel correlator the broadcasting framing signal of said predetermined time slot section is carried out catching of code phase; Particularly, with shift register of broadcasting framing signal input of said predetermined time slot section, each of shift register is carried out contraposition with the local code that presets and is multiplied each other; With resulting results added, obtain a correlated results again.Move the input signal (being the broadcasting framing signal of said predetermined time slot section) in the shift register; To obtain correlated results to each code phase of input signal and local code; Get maximum wherein; As the code phase of input signal, be about to the code phase of said maximum as the broadcasting framing signal of said predetermined time slot section.Wherein, said parallel correlator comprises multiplier and the said accumulator with resulting results added that said shift register, said contraposition are multiplied each other.
S203: produce the local code consistent, said broadcasting framing signal and said local code execution multiplying are generated first signal with the code phase of said broadcasting framing signal.
Code phase according to the broadcasting framing signal of said predetermined time slot section; The terminal produces the local code consistent with said code phase; And the broadcasting framing signal and the said local code execution multiplying of said predetermined time slot section are generated first signal, realize that the spreading code of the broadcasting framing signal of said predetermined time slot section is peeled off.
S204: n carrier signal of different frequency carried out down-conversion computing and integral operation with said first signal respectively, generate n correlated results, wherein said n corresponding n different frequency of correlated results, n is a positive integer.
In the practical application, the n of a said different frequency carrier signal can be produced by n carrier generator; Perhaps, the n of a said different frequency carrier signal can be produced by 1 carrier generator.
When n carrier signal of said different frequency can be produced by n carrier generator, down-conversion computing and integral operation, each self-generating n correlated results were carried out with parallel and said first signal of n carrier signal of different frequency in the terminal; Wherein said n corresponding n the different preset frequency of carrier signal, n is a positive integer.
Particularly, for example: when n was 2, it was that the carrier signal 1 of f1 is the carrier signal 2 of f2 with preset frequency that 2 carrier generators produce preset frequency; Down-conversion computing and integral operation are carried out with carrier signal 1 and said first signal in the terminal, generate the correlated results 1 of corresponding preset frequency f1; Down-conversion computing and integral operation are carried out with carrier signal 2 and said first signal in the terminal, generate the correlated results 2 of corresponding preset frequency f2,2 correlated results of so just parallel generation; Down-conversion computing and integral operation that said carrier signal 1 is carried out with down-conversion computing and the integral operation Synchronous Processing that said carrier signal 2 is carried out, are promptly carried out with parallel mode.
When n carrier signal of said different frequency can be produced by 1 carrier generator; The terminal with n carrier signal of different frequency successively with said first signal; Mode according to serial is carried out down-conversion computing and integral operation respectively, successively generates n correlated results of a corresponding n different frequency; Wherein n is a positive integer.
Particularly; For example: when n is 3; It is the carrier signal 1 of f1 that carrier generator produces preset frequency, and the terminal is that the carrier signal 1 of f1 is carried out down-conversion computing and integral operation with said first signal with preset frequency, generate corresponding preset frequency f1 correlated results 1; After generating said correlated results 1; Carrier generator produces the carrier signal 2 that preset frequency is f2 again; The terminal is that the carrier signal 2 of f2 is carried out down-conversion computing and integral operation with said first signal with preset frequency, generate corresponding preset frequency f2 correlated results 2; After generating said correlated results 2; Carrier generator produces the carrier signal 3 that preset frequency is f3 again; The terminal is that the carrier signal 3 of f3 is carried out down-conversion computing and integral operation with said first signal with preset frequency; Generate corresponding preset frequency f3 correlated results 3, like this, just generate 3 correlated results successively.
When n carrier signal of said different frequency can be produced by 1 carrier generator, said will said first signal further comprising before with n the carrier signal execution down-conversion computing and the integral operation of different frequency respectively:
Store said first signal;
Accordingly, first signal of said storage is carried out n down-conversion computing and integral operation respectively, obtain n correlated results.
S205: a said n correlated results is compared, obtain maximum correlated results.
S206: the frequency that the correlated results of said maximum is corresponding is as the frequency of said broadcasting framing signal, thereby catches the frequency of said broadcasting framing signal.
When the frequency of the frequency of said carrier signal and said broadcasting framing signal was consistent, said correlated results was a maximum, and each correlated results is all corresponding with the frequency of a carrier signal; Therefore after obtaining maximum correlated results, just can obtain the corresponding frequency of correlated results of said maximum,, thereby realize the frequency acquisition of said broadcasting framing signal the frequency of said frequency as said broadcasting framing signal according to the correlated results of said maximum.
Executive agent in the present embodiment can be terminals such as mobile phone, palm TV, but is not limited thereto, and repeats no more at this.
Present embodiment is the frequency acquisition that carries out to the broadcasting framing signal of a predetermined time slot section; The power invariability of the ofdm signal on the broadcasting framing signal of a predetermined time slot section; Therefore the correlated results that obtains through the method for present embodiment only has direct relation with the frequency of carrier signal; Do not receive the influence of ofdm signal, the correlated results that obtains according to the broadcasting framing signal of different predetermined time slot sections in the prior art of comparing, the comparativity of the correlated results that present embodiment obtains is strong; Can capture correct frequency according to said correlated results, make the mistake rate of catching of frequency reduce.
In addition, present embodiment can also obtain correlated results through parallel mode, thereby capture frequency makes the speed of frequency acquisition improve n doubly.
Embodiment 3
With reference to figure 4, Fig. 4 is a kind of structural representation of broadcasting the frequency acquisition device embodiment of framing signal that the embodiment of the invention 3 provides; The frequency acquisition device of said broadcasting framing signal is applied to broadcast a predetermined time slot section of framing signal, comprising:
Down-conversion integral unit 303 is used for n carrier signal of different frequency carried out down-conversion computing and integral operation with said first signal respectively, generates n correlated results, wherein said n corresponding n different frequency of correlated results, and n is a positive integer.
The frequency acquisition device of the framing signal of broadcasting described in the present embodiment can be terminals such as mobile phone, palmtop PC, but is not limited thereto, and repeats no more at this.
Present embodiment is the frequency acquisition that carries out to the broadcasting framing signal of a predetermined time slot section; The power invariability of the ofdm signal on the broadcasting framing signal of a predetermined time slot section; Therefore the correlated results that obtains of the device through present embodiment only has direct relation with the frequency of carrier signal; Do not receive the influence of ofdm signal, the correlated results that obtains according to the broadcasting framing signal of different predetermined time slot sections in the prior art of comparing, the comparativity of the correlated results that present embodiment obtains is strong; Can capture correct frequency according to said correlated results, make the mistake rate of catching of frequency reduce.
Embodiment 4
With reference to figure 5, Fig. 5 is a kind of information interaction sketch map of broadcasting the frequency acquisition device embodiment of framing signal that the embodiment of the invention 4 provides; The frequency acquisition device of said broadcasting framing signal is applied to broadcast a predetermined time slot section of framing signal, comprising: local code generator 301, first multiplier 302, down-conversion integral unit 303, comparator 304 and frequency acquisition device 305.
The function class of local code generator described in the function of said local code generator 301, first multiplier 302, comparator 304 and frequency acquisition device 305 and the embodiment 3 301, first multiplier 302, comparator 304 and frequency acquisition device 305 seemingly; Specifically can repeat no more at this referring to the associated description of embodiment 3.
The frequency acquisition device of said broadcasting framing signal further comprises:
Phase acquisition device 307 is used for catching according to parallel correlator the code phase of said broadcasting framing signal.
Said down-conversion integral unit 303 is further used for, and parallel and said first signal of n carrier signal of different frequency is carried out down-conversion computing and integral operation, generates n correlated results; Wherein said n corresponding n the different preset frequency of carrier signal.
Said down-conversion integral unit 303 comprises n parallel down-conversion integration subelement 3031; Said down-conversion integration subelement 3031 is used for the carrier signal and said first signal of preset frequency are carried out down-conversion computing and integral operation, generates the correlated results of corresponding preset frequency.
Said down-conversion integration subelement 3031 comprises carrier generator 3031a, sine table 3031b, cosine table 3031c, the second multiplier 3031d, the 3rd multiplier 3031e, first integral device 3031f, second integral device 3031g and quadratic sum arithmetic unit 3031h; As shown in Figure 6, Fig. 6 is the mutual sketch map of internal information of the down-conversion integration subelement that provides of the embodiment of the invention 4.
Carrier generator 3031a is used to produce the carrier signal of preset frequency.
Particularly, said carrier generator 3031a only produces the carrier signal of 1 preset frequency.
Sinusoidal processor 3031b is used for the sinusoidal signal according to said carrier signal inquiry sine table generation preset frequency; Said sine table is stored in the said sinusoidal processor.
The second multiplier 3031d is used for said first signal is carried out multiplication mutually with the sinusoidal signal of said preset frequency, generates secondary signal.
The 3rd multiplier 3031e is used for said first signal is carried out multiplication mutually with the cosine signal of said preset frequency, generates the 3rd signal.
First integral device 3031f is used for said secondary signal is carried out integral operation, generates i road signal.
Second integral device 3031g is used for said the 3rd signal is carried out integral operation, generates q road signal.
Quadratic sum arithmetic unit 3031h is used for said i road signal and said q road signal are carried out the quadratic sum computing, generates the correlated results of preset frequency.
The inside part of each down-conversion integration subelement 3031 all is the same, and the frequency of the carrier signal that carrier generator 3031a produces in the said down-conversion integration subelement 3031 that different is is different.
Said down-conversion integral unit 303 comprises that the situation of n parallel down-conversion integration subelement 3031 is for obtaining the situation of correlated results through parallel mode.
Present embodiment can also only obtain n correlated results with 1 down-conversion integral unit 303; Said down-conversion integral unit is further used for; N carrier signal of different frequency carried out down-conversion computing and integral operation with said first signal successively, generate n correlated results.
When present embodiment only obtains n correlated results with 1 down-conversion integral unit 303; The frequency acquisition device of said broadcasting framing signal further comprises: memory 308; As shown in Figure 7, Fig. 7 is a kind of second structural representation of broadcasting the frequency acquisition device of framing signal that the embodiment of the invention 4 provides;
Said memory is used for before said n carrier signal with different frequency carried out down-conversion computing and integral operation with said first signal respectively, storing said first signal.
Accordingly, n carrier signal of different frequency carried out down-conversion computing and integral operation with first signal of said storage successively, successively obtain n correlated results.
Said down-conversion integral unit 303 comprises first carrier generator, the first sinusoidal processor, the first cosine processor, the 4th multiplier, the 5th multiplier, third integral device, the 4th integrator and the first quadratic sum arithmetic unit.Particularly; Behind said first signal of said memory stores; Said first carrier generator can successively produce the carrier signal of n different frequency; Send carrier signal to said first sine table and said first cosine table of preset frequency successively, said preset frequency belongs to a said n different frequency.The said first sinusoidal processor generates the sinusoidal signal of preset frequency according to the carrier signal inquiry sine table of said preset frequency; The said first cosine processor generates the cosine signal of preset frequency according to the carrier signal inquiry cosine table of said preset frequency; Said the 4th multiplier carries out multiplication mutually with said first signal with the sinusoidal signal of said preset frequency, generates the 4th signal.Said the 5th multiplier carries out multiplication mutually with said first signal with the cosine signal of said preset frequency, generates the 5th signal; Said third integral device carries out integral operation with said the 4th signal, generates i road signal; Said the 4th integrator carries out integral operation with said the 5th signal, generates q road signal; The said first quadratic sum arithmetic unit is carried out the quadratic sum computing with said i road signal and said q road signal, generates the correlated results of said preset frequency.Send carrier signal to the said first sinusoidal processor and the said first cosine processor of preset frequency in the present embodiment successively and carry out subsequent treatment, obtain the correlated results of a said n different frequency successively.
The frequency acquisition device of the framing signal of broadcasting described in the present embodiment can be terminals such as mobile phone, palmtop PC, but is not limited thereto, and repeats no more at this.
Present embodiment is the frequency acquisition that carries out to the broadcasting framing signal of a predetermined time slot section; The power invariability of the ofdm signal on the broadcasting framing signal of a predetermined time slot section; Therefore the correlated results that obtains through the method for present embodiment only has direct relation with the frequency of carrier signal; Do not receive the influence of ofdm signal, the correlated results that obtains according to the broadcasting framing signal of different predetermined time slot sections in the prior art of comparing, the comparativity of the correlated results that present embodiment obtains is strong; Can capture correct frequency according to said correlated results, make the mistake rate of catching of frequency reduce.
In addition, present embodiment can also adopt a plurality of down-conversion integration subelements to obtain correlated results through parallel mode, thereby capture frequency makes the speed of frequency acquisition be improved n doubly.Present embodiment can also obtain correlated results through 1 down-conversion integral unit, can save chip area and power consumption.
Need to prove that each embodiment in this specification all adopts the mode of going forward one by one to describe, what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.For device type embodiment, because it is similar basically with method embodiment, so description is fairly simple, relevant part gets final product referring to the part explanation of method embodiment.
Need to prove; In this article; Relational terms such as first and second grades only is used for an entity or operation are made a distinction with another entity or operation, and not necessarily requires or hint relation or the order that has any this reality between these entities or the operation.And; Term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability; Thereby make and comprise that process, method, article or the equipment of a series of key elements not only comprise those key elements; But also comprise other key elements of clearly not listing, or also be included as this process, method, article or equipment intrinsic key element.Under the situation that do not having much more more restrictions, the key element that limits by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises said key element and also have other identical element.
The all or part of step that one of ordinary skill in the art will appreciate that realization the foregoing description can be accomplished through hardware; Also can instruct relevant hardware to accomplish through program; Described program can be stored in a kind of computer-readable recording medium; The above-mentioned storage medium of mentioning can be a read-only memory, disk or CD etc.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a frequency capture method of broadcasting framing signal is characterized in that, said method is applied to broadcast a predetermined time slot section of framing signal, comprising:
Produce the local code consistent, said broadcasting framing signal and said local code execution multiplying are generated first signal with the code phase of said broadcasting framing signal;
N carrier signal of different frequency carried out down-conversion computing and integral operation with said first signal respectively, generate n correlated results, wherein said n corresponding n different frequency of correlated results, n is a positive integer;
A said n correlated results is compared, obtain maximum correlated results;
The frequency that the correlated results of said maximum is corresponding is as the frequency of said broadcasting framing signal, thereby catches the frequency of said broadcasting framing signal.
2. method according to claim 1 is characterized in that, the said generation local code consistent with the code phase of the broadcasting framing signal of said predetermined time slot section further comprises before:
Receive said broadcasting framing signal;
Catch the code phase of said broadcasting framing signal according to parallel correlator.
3. method according to claim 1 and 2 is characterized in that, said n carrier signal with different frequency carried out down-conversion computing and integral operation with said first signal respectively, generates n correlated results, comprising:
Parallel and said first signal of n carrier signal of different frequency is carried out down-conversion computing and integral operation, generate n correlated results; Wherein said n corresponding n the different preset frequency of carrier signal.
4. method according to claim 1 and 2 is characterized in that, said n carrier signal with different frequency carried out down-conversion computing and integral operation with said first signal respectively, generates n correlated results, comprising:
N carrier signal of different frequency carried out down-conversion computing and integral operation with said first signal successively, generate n correlated results.
5. a frequency acquisition device of broadcasting framing signal is characterized in that, said device is applied to broadcast a predetermined time slot section of framing signal, comprising:
The local code generator is used to produce the local code consistent with the code phase of said broadcasting framing signal;
First multiplier is used for said broadcasting framing signal and said local code execution multiplying are generated first signal;
The down-conversion integral unit is used for n carrier signal of different frequency carried out down-conversion computing and integral operation with said first signal respectively, generates n correlated results, wherein said n corresponding n different frequency of correlated results, and n is a positive integer;
Comparator is used for a said n correlated results is compared, and obtains maximum correlated results;
The frequency acquisition device is used for the frequency of the frequency that the correlated results of said maximum is corresponding as said broadcasting framing signal, thereby catches the frequency of said broadcasting framing signal.
6. device according to claim 5 is characterized in that, further comprises:
Receiver is used for receiving said broadcasting framing signal before at the said generation local code consistent with the code phase of said broadcasting framing signal;
The phase acquisition device is used for catching according to parallel correlator the code phase of said broadcasting framing signal.
7. according to claim 5 or 6 described devices, it is characterized in that said down-conversion integral unit comprises n parallel down-conversion integration subelement; Said down-conversion integration subelement is used for the carrier signal and said first signal of preset frequency are carried out down-conversion computing and integral operation, generates the correlated results of corresponding preset frequency.
8. according to claim 5 or 6 described devices, it is characterized in that said down-conversion integral unit is further used for, n carrier signal of different frequency carried out down-conversion computing and integral operation with said first signal successively, generate n correlated results.
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| CN108521388A (en) * | 2018-04-10 | 2018-09-11 | 北京邮电大学 | A kind of frequency capture method, device, electronic equipment and storage medium based on TC-OFDM |
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| CN102724156B (en) * | 2012-06-01 | 2014-12-31 | 北京邮电大学 | Generation method as well as positioning method and device of time-division code-division orthogonal frequency division multiplexed signals |
| CN103152043A (en) * | 2013-02-05 | 2013-06-12 | 北京邮电大学 | Method and system for generating indoor signal frequency sources |
| CN108521388A (en) * | 2018-04-10 | 2018-09-11 | 北京邮电大学 | A kind of frequency capture method, device, electronic equipment and storage medium based on TC-OFDM |
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