CN106936757A - The choosing method of leading symbol signal length - Google Patents
The choosing method of leading symbol signal length Download PDFInfo
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- CN106936757A CN106936757A CN201710091674.0A CN201710091674A CN106936757A CN 106936757 A CN106936757 A CN 106936757A CN 201710091674 A CN201710091674 A CN 201710091674A CN 106936757 A CN106936757 A CN 106936757A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
- H04L27/2613—Structure of the reference signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2692—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with preamble design, i.e. with negotiation of the synchronisation sequence with transmitter or sequence linked to the algorithm used at the receiver
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- Engineering & Computer Science (AREA)
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- Computer Networks & Wireless Communication (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
Abstract
The invention provides a kind of choosing method of leading symbol signal length, the sample frequency that has for the leading symbol multi-sampling rate system different with the sample frequency that corresponding data symbol has, it is characterised in that including：In the leading symbol from time domain main running signal, suffix or advanced sew and length when not carrying out sampling frequency conversion of the corresponding signal in prefix three part is based on all different sample frequencys in the multi-sampling rate system and is chosen, during so as to ensureing that the selected spatial structure for obtaining can carry out sample rate in the broadcast communication system of multiple sampling rate and change, it is to avoid the distorted signals caused because sampling number is not divided exactly.
Description
The application is the divisional application of original bill, the application number 201510308682.7 of original bill, June 5 2015 applying date,
Invention and created name " choosing method of leading symbol signal length ".
Technical field
The present invention relates to the leading symbol of physical frame in broadcast communication system, adopted more specifically to suitable for multiple
The choosing method of the choosing method of the spatial structure of the leading symbol under sample frequency, especially signal length.
Background technology
Leading symbol plays an important roll in broadcast with communication system, is to carry out system discovery, Timing Synchronization, channel to estimate
Indispensable part in meter and signalling.Therefore needing leading symbol has robustness very high with extremely low detection door
Limit.DVB-T2 has used a kind of time-domain symbol of three-stage structure, but due to no Cyclic Prefix, it is impossible to suitable for relevant detection.
Therefore, the personnel of correlative technology field propose a kind of three-stage spatial structure with circulating prefix structure, can solve it is above-mentioned not
Foot.
This kind of time-domain symbol of three-stage structure when for multi-sample-frequencies broadcast communication system, leading symbol and system
The sample rate of interior other data symbols is different.Generate leading symbol after, it is necessary to first carry out sample rate conversion make leading symbol and
The sample rate unification of other symbols, then delivers to digital analog converter output again.
However, due to three-stage spatial structure design in not it is considered that because sample rate difference need to carry out conversion process this
One process, accordingly, it is possible to the sampled point number non-integer after sample rate can be caused to change, so as to need that sampling number is taken
Whole computing, once rounding operation, then then can priming signal distortion problem.
The content of the invention
In order to solve the above problems, the invention provides a kind of choosing method of signal length in leading symbol, purpose exists
In the specific spatial structure i.e. time domain main running signal, suffix for making to obtain through design or advanced sew and prefix turns carrying out sample rate
Above-mentioned problem of dtmf distortion DTMF is avoided when changing so as to fit using in multi-sample-frequencies broadcast communication system.
The invention provides a kind of choosing method of leading symbol signal length, for the sample frequency that leading symbol has
The multi-sampling rate system different with the sample frequency that corresponding data symbol has, it is characterised in that including：In leading symbol with when
Domain main running signal, suffix or it is advanced sew and the corresponding signal in prefix three part length when not carrying out sampling frequency conversion
Degree is chosen based on all different sample frequencys in multi-sampling rate system.
Further, wherein, when the length to not carrying out the corresponding signal in first three part of sampling rate conversion is chosen,
Comprise the following steps：According to all different sample frequencys in multi-sampling rate system so that default base frequency is based on following
Condition must determine：All different sample frequencys can be multiplied by corresponding several integer multiples by with same base frequency
Obtain；The integer multiple corresponding with the sample frequency of leading symbol is selected from several integer multiples, as benchmark times
Number；And by the leading symbol for not carrying out sampling rate conversion with time domain main running signal, suffix or it is advanced sew and prefix this three
The length of the corresponding signal in part is both designed as the integral multiple of the benchmark multiple.
Further, wherein, and same predetermined basis frequency multiplication all highest common divisors between several integer multiples
Number is the positive integer more than or equal to 1.
Further, wherein, the length of time domain main running signal elects the integral number power of numerical value 2 as.
Further, wherein, the length of suffix or the advanced length sewed less than or equal to prefix.
Further, wherein, leading symbol is included：Based on by choosing the time domain that the signal of length is formed respectively
Main running signal, suffix are sewed and prefix in advance, to realize to be and data symbol by the sampling frequency conversion of leading symbol
During sample frequency so that time domain main running signal in the leading symbol after sampling rate conversion, suffix or it is advanced sew and prefix letter
Number length is integer.
Further, wherein, time domain main running signal, suffix or advanced sew and the length of prefix corresponds to value and is respectively
2048 points, 496 points and 528 points.
Further, wherein, leading symbol include at least one three-stage structure time-domain symbol, the three-stage structure time-domain symbol
Comprising the Part I signal as time domain main running signal, based on part time domain main running signal generation as Part I signal
Suffix or the advanced Part II signal sewed and based on part time domain main running signal generation as the prefix of Part I signal
Part III signal.
Further, wherein, by the following method by have the first sample rate leading symbol be processed as the second sample rate
Equivalent signal, the splicing in time domain is realized with the data symbol with the second sample rate：Time domain resampling method：Leading symbol
Sampled signal carries out resampling；Or the direct converter technique of frequency domain：By the both sides zero filling of the frequency domain main running signal with the first sample rate
The time domain main running signal that IFFT obtains that there are the need of the second sample rate to sample is remake afterwards；Then by original prefix, suffix or advanced
The selection rule sewed chooses the sampled point of length-specific from the time domain main running signal that need to be sampled respectively, by after appropriate phase shift
Leading symbol is spliced to form with the time domain main running signal, length-specific is：Original prefix, suffix or the advanced length sewed are divided by the
One sample rate, multiplied by with the second sample rate.
Further, in time domain resampling method：Carry out interpolation coefficient and the extraction coefficient difference used during resampling
The corresponding integer multiple of sample frequency of integer multiple and data symbol corresponding to the sample frequency of leading symbol so that weight
The waveform number obtained after sampling is integer；In the direct converter technique of frequency domain：The number for carrying out the zero of zero filling is based on time domain main body
The length of signal is multiplied by pre-determined factor and obtains, and is positive integer, and the pre-determined factor is subtracted leading by the sample frequency of data symbol
Difference obtained by the sample frequency of symbol and the ratio between the sample frequency of leading symbol determine；Before after sampling frequency conversion
Sew, suffix or the advanced length sewed are the corresponding length before sampling frequency conversion divided by the first sample rate, multiplied by with the second sampling
Length before and after rate, and sampling frequency conversion is positive integer.
Effect of the invention and effect
According to the choosing method of signal length in leading symbol provided by the present invention, it is contemplated that multi-sampling rate system
Interior all different sample frequencys, take into account the sample frequency of leading symbol and the sample frequency of data symbol, before determination
Lead symbol three-stage structure i.e. time domain main running signal, suffix or it is advanced sew and prefix time span (counting), so as to ensure
The designed spatial structure for obtaining can carry out sample rate in the broadcast communication system of multiple sampling rate when changing, it is to avoid because
The distorted signals caused for sampling number is not divided exactly.
Brief description of the drawings
Fig. 1 is the design flow diagram of signal length in leading symbol in the embodiment of the present invention；
Fig. 2 is the spatial structure figure of the first leading symbol in the embodiment of the present invention；And
Fig. 3 is second spatial structure figure of leading symbol in the embodiment of the present invention.
Specific embodiment
Inventor had found in prior art, be to the three-stage spatial structure of leading symbol, time domain main running signal, suffix or
It is advanced sew and the design of prefix in do not consider that the sampled point number non-integer after sample rate conversion needs to enter sampling number
Row rounding operation and the problem of distorted signals that triggers.
Regarding to the issue above, inventor is by research, there is provided a kind of choosing method of leading symbol signal length, is used for
The sample frequency that leading symbol the has multi-sampling rate system different with the sample frequency that corresponding data symbol has, its feature exists
In, including：In leading symbol with time domain main running signal, suffix or it is advanced sew and signal that prefix three part is corresponding not
Length when carrying out sampling frequency conversion is based on all different sample frequencys in multi-sampling rate system and is chosen.
In order that the above objects, features and advantages of the present invention can become apparent it is understandable, below in conjunction with the accompanying drawings to this hair
Bright specific embodiment is described in detail.
Fig. 2 is the spatial structure figure of the first leading symbol in the embodiment of the present invention.Fig. 3 is second in the embodiment of the present invention
Plant the spatial structure figure of leading symbol.
As shown in Figures 2 and 3, based on one section of time domain main running signal (mark is in Fig. 2 and Fig. 3), two can respectively be generated
Common leading symbol is planted, Fig. 2 shows the leading symbol with the first three-stage structure；Fig. 3 show with second three sections
The leading symbol of structure.The single three-stage structure time-domain symbol that the present invention not only shows comprising Fig. 2 or Fig. 3, leading symbol bag
Containing at least one three-stage structure time-domain symbol, leading symbol can comprising the first three-stage structure or second three-stage structure or
The independent assortment of any number of the first three-stage structure and second three-stage structure order in no particular order.
Three-stage structure time-domain symbol is included as the Part I signal of time domain main running signal A, based on part time domain main body
Signal A is generated as the suffix or the advanced Part II signal B for sewing of Part I signal A and believed based on part time domain main body
Number generation as Part I signal A prefix Part III signal C.
Specifically, a part is taken out as prefix (prefix is designated C in figs. 2 and 3) from the rear portion of A, carrying out must
The treatment wanted and the front portion for copying to A；A part is taken out from the rear portion of A simultaneously to sew (in Fig. 2 and Fig. 3 as suffix or in advance
It is designated B), it can be seen that part B is used as prefix in the leading symbol of the first three-stage structure of Fig. 2；Second three of Fig. 3
Part B is then as suffix in the leading symbol of segment structure.So, the designed leading symbol bag with the first three-stage structure
Signal combination containing resulting C-A-B as shown in Figure 2, accordingly, can also enter according to the order of B-C-A as shown in Figure 3
Row combination.
Wherein, when necessary treatment is carried out to C portion and part B, one can be multiplied by admittedly to each sampling of signal
A different coefficient is multiplied by fixed coefficient, or each sampling.
The length of part A, part B and C portion is designated as NA, NB and NC respectively, it is clear that NA, NB and NC are positive integer,
And NA>NB,NC.
Due to time domain main running signal part A be a frequency domain main body by the result after inverse Fourier transform, in order to reduce
Computation complexity, the length of usual A elects 2 integral number power as, for example：The length of A be 512 or 1024 or 2048, etc..This reality
Apply the expansion explanation as a example by 2048 in example.
For the leading symbol of the first three-stage structure, C portion plays a part of protection interval, it is therefore desirable to certain
Length to eliminate the intersymbol interference (ISI) that multipath is caused, the maximum multipath for for example if desired considering is 500 sampling weeks
Phase, then now the length of C portion at least needs to be 500.Further consider：When auto-correlation reception postpone, due to
Need for the latter half of C and B to carry out correlation computations, therefore the length of B should be less than being equal to C, but wherein consider to deposit
All kinds of channel factors, can be failed simultaneously in certain specific multipath if B is identical with the length of C, should avoid B's and C
Length is identical, and the present invention is not construed as limiting to this point；Meanwhile, the length of B should in allowed limits take larger value, good to obtain
Good delay autocorrelation performance.
Therefore, consider above-mentioned condition, for obtaining group time domain main running signal, suffix or it is advanced sew and prefix length
Degree parameter can be NA=2048, NC=500, NB=499, and the present embodiment is carried out so far by this technical thought, and what is analyzed lacks
Falling into is, due to only considering above-mentioned condition, the selection of this group of parameter still still compares blindly random, and the later stage is not considered but
Cause the adverse consequences of distortion during resampling because being unsatisfactory for integer relation.
So, further using preferred scheme, the specific choosing method of length to A, B, C carries out following theory to the present embodiment
It is bright：
For the system of multi-sampling rate, the one of system assembles to put and at most only exists two kinds of different sample frequencys, for example
(F1, F2) or (F1, F3) or (F1, F4), in this implementation, have sample frequency F1 and data symbol with leading symbol
With being illustrated as a example by sample frequency F2, other situations are by that analogy.Wherein the sample frequency of leading symbol is F1, data symbols
Number frequency for F2 or F3 or F4 etc., and F1 is less than F2 or F3 or F4.
In order to the leading symbol with the first sample frequency (i.e. F1) is processed as into the equivalent of the second sample frequency (i.e. F2)
Signal, splicing, it is necessary to the first sample frequency in time domain is realized with the data symbol with the second sample rate
Leading symbol is processed, to obtain its equivalent signal under the second sample frequency.Specific method has two kinds：Time domain resampling
Or the direct converter technique of frequency domain.
【Time domain resampling method】
Time domain resampling method is used to for the sampled signal of leading symbol to carry out resampling.What is used during resampling is interior
Slotting coefficient and extraction coefficient are respectively the sampling of the integer multiple M1 and data symbol corresponding to the sample frequency of leading symbol frequently
The corresponding integer multiple M2 of rate so that the waveform number obtained after resampling is integer.
In the time domain resampling method：Carry out the interpolation coefficient that is used during resampling and extract coefficient be respectively it is described leading
The corresponding integer multiple of sample frequency of the integer multiple and the data symbol corresponding to the sample frequency of symbol,
So that the waveform number obtained after resampling is integer.Specifically, time domain resampling method is adopted for the leading symbol of generation
Sample signal, resampling is carried out by resampler, so as to obtain new sampled signal.If the waveform number before resampling is N1,
Waveform number N2=N1*M2/M1 after then sampling is necessary for integer, just can guarantee that before and after resampling do not have dropout, so that
Guarantee total duration is equal, signal is undistorted, and to extract coefficient, the M1 is interpolation coefficient to the M2.
Time domain resampling method can respectively be carried out and then reconnected for A, B and C portion, it is also possible to CAB or BCA structures
Whole leading symbol together carry out, can also be for by multiple CAB and/or BCA structures multiple leading symbols for obtaining of connection
Together carry out.
【The direct converter technique of frequency domain】
Generally speaking, leading symbol frequency domain main running signal can be directly changed into required sample rate by the direct converter technique of frequency domain
Time domain main running signal.It is, the institute that IFFT obtains sampling will be remake after the both sides zero filling of the frequency domain main running signal before conversion
State time domain main running signal；Then by original prefix, suffix or the advanced selection rule sewed respectively from the time domain master that need to be sampled
The sampled point of length-specific is chosen in body signal, it is described leading by being spliced to form with the time domain main running signal after appropriate phase shift
Symbol, the length-specific is：Original prefix, suffix or the advanced length sewed are adopted divided by the first sample frequency multiplied by with second
Sample frequency.
Frequency domain main running signal before conversion is designated as X1, time domain main body letter before frequency domain main running signal X1 and sampling frequency conversion
Number A1 has FFT corresponding relations, then the frequency domain main running signal X2 after the both sides of X1 obtain zero filling plus equal number of zero, its
In zero total number be N_z=N_A* (F2-F1)/F1；Then again to X2 as IFFT obtain sampling rate conversion after time domain main body letter
Number A2；Then select the sampled point of length-specific from A2 respectively by original prefix, suffix or the advanced selection rule sewed, pass through
New leading symbol is spliced to form after appropriate phase shift with A2.But during this, the determination method of the length-specific is：Sampling
Length N_B2, N_C2 of B, C portion after rate conversion is removed respectively for the B before sampling rate conversion, length N_B1, N_B2 of C portion
With the first sample frequency multiplied by with the second sample frequency.
To ensure that the spatial structure scheme that design is obtained can be applicable above two sampling rate conversion method, should meet：
Waveform number N2 after being sampled during time domain resampling meets condition：N2=N1*F2/F1 and N2 are positive integer；Frequency domain is directly converted
When, the number for carrying out the zero of zero filling is based on the length of time domain main running signal and is multiplied by pre-determined factor and obtains, and is positive integer, and this makes a reservation for
Coefficient subtracts leading symbol as the sample frequency of data symbol obtained by sample frequency difference and the sample frequency of leading symbol
Between ratio determine that is, zero number N_z=N_A* (F2-F1)/F1 is after positive integer, also, sampling rate conversion and to sample
The ratio between suffix or advanced length, the length of prefix sewed before rate conversion is respectively by the sample frequency of data symbol and preceding
The sample frequency for leading symbol determines, and length before and after sampling rate conversion is positive integer, that is, B, the length N_ of C portion after sampling
B2=N_B1*F2/F1, N_C2=N_C2*F2/F1 are positive integer.
Therefore, it is designed selection for the length for not carrying out the corresponding signal in three part before sampling frequency conversion
When, method is as follows：
First by system it is all be likely to occur different sample frequencys (be designated as F1, F2, F3, etc.) be written as certain basis
The multiple of frequency F0：
F1=F0*M1,
F2=F0*M2,
F3=F0*M3,
Wherein, M1, M2, M3 are the multiple of base frequency described above.Need to ensure whole multiples such as M1, M2, M3 most
Big common divisor is 1, and in the present invention, greatest common divisor can be the positive integer more than or equal to 1.
Using M1 as benchmark multiple；And on the basis of the length of the part of A, B and C tri- with the first sample frequency is determined
The integral multiple of multiple.
If for example, in certain multi-sampling rate system, the sample rate of leading symbol is 6.144MHz, the sampling of other symbols
Rate is：6.912MHz, 8.064MHz, 9.216MHz, i.e.,：
F1=6.144,
F2=6.912,
F3=8.064
F4=9.216
Base frequency be can determine that for 0.384MHz, each sample rate can be written as：
F1=F0*N1, N1=16
F2=F0*N2, N2=18
F3=F0*N3, N3=21
F4=F0*N4, N4=24
It is 1 to be clear to the greatest common divisor of N1, N2, N3, N4, meets above-mentioned requirements.
NA=2048 in example described previously, NB=500, NC=499 obviously do not meet above-mentioned requirements A, B, C tri- parts
No matter this relation of the integral multiple of multiple N1 on the basis of length is equal, can introduce signal and lose using which kind of sampling rate conversion method
Very.The parameter for obtaining is redesigned using method as described above as follows：
NA=2048 is the integral multiple of N1=16, meets and requires；
NC need be N1 integral multiple, and not less than 500, can obtain the selectable value of NC is：512nd, 528,540, by that analogy.
NB need be N1 integral multiple, close to but less than NC, it is seen that the selectable value of NB can be：512nd, 496,480, with this
Analogize.
From above-mentioned option, can obtain one group of value of NA, NB, NC is (2048,496,528), meets requirements,
This value is also allowed for when carrying out postponing auto-correlation receiving, due to need by the latter half of C and B carry out correlation computations thus
The length of B should be less than being equal to C.
The leading symbol for obtaining in this way is set to ensure that no matter directly become using time domain resampling method or frequency domain
Method is changed, integer sampled point can be accessed, distorted signals will not be caused.
Although the present invention is disclosed as above with preferred embodiment, it is not for limiting the present invention, any this area
Technical staff without departing from the spirit and scope of the present invention, may be by the methods and techniques content of the disclosure above to this hair
Bright technical scheme makes possible variation and modification, therefore, every content without departing from technical solution of the present invention, according to the present invention
Any simple modification, equivalent variation and modification for being made to above example of technical spirit, belong to technical solution of the present invention
Protection domain.
Claims (10)
1. a kind of choosing method of leading symbol signal length, the sample frequency having for leading symbol and corresponding data symbol
The different multi-sampling rate system of the sample frequency that has, it is characterised in that including：
In the leading symbol with time domain main running signal, suffix or it is advanced sew and signal that prefix three part is corresponding not
The length for carrying out sampling frequency conversion is chosen based on all different sample frequencys in the multi-sampling rate system.
2. the choosing method of leading symbol signal length as claimed in claim 1, it is characterised in that：
Wherein, when being chosen to the length for not carrying out the corresponding signal in three part of sampling frequency conversion, including with
Lower step：
According to all different sample frequencys in the multi-sampling rate system so that default base frequency is obtained based on following condition
To determination：All different sample frequencys are obtained by being multiplied by corresponding several integer multiples with same base frequency
Arrive；
The integer multiple corresponding with the sample frequency of the leading symbol is selected from described several integer multiples, as
Benchmark multiple；And
To not carry out in the leading symbol of sampling frequency conversion with time domain main running signal, suffix or advanced sew and prefix should
The length of the corresponding signal in three parts is both designed as the integral multiple of the benchmark multiple.
3. the choosing method of leading symbol signal length as claimed in claim 2, it is characterised in that：
Wherein, greatest common divisor is big and all described several integer multiples of the same predetermined basis frequency multiplication between
In the positive integer equal to 1.
4. the choosing method of leading symbol signal length as claimed in claim 2, it is characterised in that：
Wherein, the length of the time domain main running signal elects the integral number power of numerical value 2 as.
5. the choosing method of leading symbol signal length as claimed in claim 2, it is characterised in that：
Wherein, the suffix or the advanced length sewed are less than or equal to the length of the prefix.
6. the choosing method of leading symbol signal length as claimed in claim 2, it is characterised in that：
Wherein, the leading symbol is included：Based on by choosing the time domain main body that the signal of length is formed respectively
Signal, the suffix or it is described sew and the prefix in advance, with realize need to be by the sampling frequency conversion of the leading symbol
During with the sample frequency of data symbol so that time domain main running signal, institute described in the leading symbol after sampling frequency conversion
State suffix or described advanced sew and the signal length of the prefix is integer.
7. the choosing method of leading symbol signal length as claimed in claim 2, it is characterised in that
Wherein, the time domain main running signal, the suffix or described advanced sew and the length of the prefix corresponds to value respectively
It is 2048 points, 496 points and 528 points.
8. the choosing method of leading symbol signal length as claimed in claim 2, it is characterised in that：
Wherein, the leading symbol includes at least one three-stage structure time-domain symbol, and the three-stage structure time-domain symbol includes work
Generated as the Part I for the Part I signal of the time domain main running signal, based on the part time domain main running signal
The suffix of signal or the advanced Part II signal sewed and generated as institute based on the part time domain main running signal
State the Part III signal of the prefix of Part I signal.
9. the choosing method of leading symbol signal length as claimed in claim 2, it is characterised in that：
Wherein, the leading symbol with the first sample rate is processed as the equivalent letter of the second sample rate by the following method
Number, the splicing in time domain is realized with the data symbol with the second sample rate：
The direct converter technique of frequency domain：Had IFFT is remake after the both sides zero filling of the frequency domain main running signal with the first sample rate
The time domain main running signal of the need sampling of second sample rate；Then advised by original prefix, suffix or the advanced selection sewed
Then respectively from the time domain main running signal that need to be sampled choose length-specific sampled point, by after appropriate phase shift with it is described
Time domain main running signal is spliced to form the leading symbol,
The length-specific is：Original prefix, suffix or the advanced length sewed are sampled divided by the first sample rate multiplied by with second
Rate.
10. the choosing method of leading symbol signal length as claimed in claim 9, it is characterised in that：
In the direct converter technique of the frequency domain：
The number for carrying out the zero of zero filling is based on the length of the time domain main running signal and is multiplied by pre-determined factor and obtains, and is positive integer,
The pre-determined factor subtracts the leading symbol as the sample frequency of the data symbol obtained by sample frequency difference and institute
The ratio stated between the sample frequency of leading symbol determines；
Prefix, suffix or the advanced length sewed after sampling frequency conversion are the corresponding length before sampling frequency conversion divided by first
Sample rate, positive integer is multiplied by the length with the second sample rate, and before and after sampling frequency conversion.
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| CN106936757B (en) | 2020-02-14 |
| CN106254046B (en) | 2020-06-09 |
| CN106254046A (en) | 2016-12-21 |
| CN107017976A (en) | 2017-08-04 |
| CN107017976B (en) | 2020-04-17 |
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