CN105049392B - Signal creating method and device - Google Patents
Signal creating method and device Download PDFInfo
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- CN105049392B CN105049392B CN201510520493.6A CN201510520493A CN105049392B CN 105049392 B CN105049392 B CN 105049392B CN 201510520493 A CN201510520493 A CN 201510520493A CN 105049392 B CN105049392 B CN 105049392B
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Abstract
The invention discloses a kind of signal creating method and devices, this method comprises: generating baseband complex signal clock, and are divided to obtain pseudo-code driving clock to baseband complex signal clock；Clock is driven to generate lower sideband numeric data code C according to pseudo-codeAD, lower sideband pilot code CAP, upper side band numeric data code CBDWith upper side band pilot code CBP；According to lower sideband data dAModulate CADObtain lower sideband data channel baseband signal component C 'AD, and according to upper side band data dBModulate CBDObtain upper side band data channel baseband signal component C 'BD；From C 'ADAnd CAPIt is middle select one as lower sideband baseband signal component CA, and from C 'BDAnd CBPIt is middle select one as upper side band baseband signal component CB；According to CAAnd CBCorresponding in-phase signal and orthogonal signalling are found in modulation mapping table；The in-phase signal and orthogonal signalling are modulated, broadband signal is generated.It can according to actual needs be four road signal distribution powers using the present invention.
Description
Technical field
The present invention relates to field of satellite navigation more particularly to a kind of signal creating methods and device.
Background technique
With the lasting construction of Global Navigation Satellite System (GNSS), navigation Service demand is constantly extending.Each satellite is led
The number of signals that boat system is broadcast in the same frequency range is more and more, so that limited satellite navigation frequency spectrum becomes more to come originally
More congestion.
Modulation system is the emphasis of Navigation Signal System research, it determines the power spectral envelope of navigation signal, to navigation
The key performances such as positioning-speed-measuring time service precision, compatibility and the interoperability of system, anti-interference ability and index play conclusive
Effect.In GPS modernization and galileo signals design process, modulation system design is industry focus of attention.Galileo system
It unites the perseverance envelope AltBOC modulation technique used by the signal of E5 frequency range, by four different navigation signal E5a-data,
E5a-pilot, E5b-data, E5b-pilot are modulated into a complex signal, and are up-converted into as centered on 1191.795MHz
A broadband signal；Wherein E5a-data and E5a-pilot is equivalent to the modulation of the QPSK on E5a frequency point (1176.45MHz)
Signal, E5b-data and E5b-pilot are equivalent to the signal of the modulation of the QPSK on E5b frequency point (1207.14MHz)；Using this
Four different navigation signals are modulated to a time multiplexed signal by mode, are only four road signals and are distributed same power, and adjust
Method processed is complicated.
Above content is only used to facilitate the understanding of the technical scheme, and is not represented and is recognized that above content is existing skill
Art.
Summary of the invention
The main purpose of the present invention is to provide a kind of signal creating method and devices, it is intended to solve inciting somebody to action in the prior art
Four different navigation signals are modulated to a time multiplexed signal, are only four road signals and distribute same power, and modulator approach
Complicated technical problem.
To achieve the above object, the present invention provides a kind of signal creating method, this method comprises:
S10, when generating baseband complex signal clock, and being divided to obtain pseudo-code driving to the baseband complex signal clock
Clock；
S11, clock driving is driven to generate lower sideband numeric data code C according to the pseudo-codeAD, lower sideband pilot code CAP, upper side band
Numeric data code CBDWith upper side band pilot code CBP；
S12, according to lower sideband data dAModulate CADObtain lower sideband data channel baseband signal component C 'AD, and according to upper
Sideband data dBModulate upper side band numeric data code CBDObtain upper side band data channel baseband signal component C 'BD；
S13, from the C 'ADAnd CAPIt is middle select one as lower sideband baseband signal component CA, and from the C 'BDAnd CBP
It is middle select one as upper side band baseband signal component CB；
S14, according to the CAAnd CBCorresponding in-phase signal and orthogonal signalling are found in preset modulation mapping table；
S15, the in-phase signal and orthogonal signalling are modulated in the frequency centered on modulating frequency, are generated to modulate
Frequency is the broadband signal of center frequency.
Preferably, the step S13 includes:
S131, by the CAPWith a fixed binary sequence CSAXOR operation is carried out, lower sideband data channel is obtained
Baseband signal component C 'AP；And by the CBPWith a fixed binary sequence CSBXOR operation is carried out, upper side band number is obtained
According to channel baseband signal component C 'BP；
S132, from the C 'ADAnd C 'APIt is middle select one as lower sideband baseband signal component CA, and from the C 'BDWith
C’BPIt is middle select one as upper side band baseband signal component CB。
Preferably, the step S13 includes:
S133, according to the first default Slot selection rule from the C 'ADAnd CAPIt is middle select one as CA；And according to second
Slot selection rule is preset from the C 'BDAnd CBPIt is middle select one as CB。
Preferably, after the step S13, this method further include:
S16, to the CAIt carries out binary modulated and generates the first modulation result, and to the CBIt is raw to carry out binary modulated
At the second modulation result；
S17, the first modulation result is modulated according to lower sideband complex subcarrier, and according to upper side band complex subcarrier
Second modulation result is modulated, corresponding in-phase signal and orthogonal signalling are generated；
S18, the in-phase signal and orthogonal signalling are modulated in the frequency centered on modulating frequency, are generated to modulate
Frequency is the broadband signal of center frequency.
Preferably, the method also includes:
S19, by all CAAnd CBValue be combined, to each combine execute step S16~step S17, obtain
It is each to combine corresponding in-phase signal and orthogonal signalling, generate modulation mapping table.
Preferably, the step S12 includes:
S121, by the dAWith CADXOR operation is carried out, C ' is obtainedAD；And by the dBWith CBDXOR operation is carried out, is obtained
C’BD。
In addition, to achieve the above object, the present invention also provides a kind of signal generating apparatus, which includes:
Clock generator, for generating baseband complex signal clock；
Frequency divider obtains pseudo-code driving clock for being divided to the baseband complex signal clock；
Pseudo- code generator, for driving clock driving to generate lower sideband numeric data code C according to the pseudo-codeAD, lower sideband pilot tone
Code CAP, upper side band numeric data code CBDWith upper side band pilot code CBP；
First modulation module, for according to lower sideband data dAModulate CADObtain lower sideband data channel baseband signal component
C’AD；
Second modulation module, for according to upper side band data dBModulate CBDObtain upper side band data channel baseband signal component
C’BD；
First multiplexing selector, is used for from the C 'ADAnd CAPIt is middle select one as lower sideband baseband signal component CA；
Second multiplexing selector, is used for from the C 'BDAnd CBPIt is middle select one as upper side band baseband signal component CB；
Searching module, for according to the CAAnd CBFound in preset modulation mapping table corresponding in-phase signal and
Orthogonal signalling；
Radio-frequency modulator, for being modulated to the in-phase signal and orthogonal signalling with modulating frequency fsCentered on frequency
On, it generates using modulating frequency as the broadband signal of center frequency.
Preferably, described device further includes third modulation module and the 4th modulation module；
The third modulation module is used for the CAPWith a fixed binary sequence CSAXOR operation is carried out, is obtained
To lower sideband data channel baseband signal component C 'AP；
4th modulation module is used for the CBPWith a fixed binary sequence CSBXOR operation is carried out, is obtained
To upper side band data channel baseband signal component C 'BP；
The first multiplexing selector is also used to from the C 'ADAnd C 'APIt is middle to select one to divide as lower sideband baseband signal
Measure CA；
The second multiplexing selector, is also used to from the C 'BDAnd C 'BPIt is middle select one as upper side band baseband signal
Component CB。
Preferably, the first multiplexing selector includes the first timeslot multiplex selector, for according to the first default time slot
Selection is regular from the C 'ADAnd CAPIt is middle select one as CA；
Second multiplexing selector includes the second timeslot multiplex selector, for according to the second default Slot selection rule from institute
State C 'BDAnd CBPIt is middle select one as CB。
Preferably, described device further include:
Subcarrier-modulated module, for the CAIt carries out binary modulated and generates the first modulation result, and to the CBInto
Row binary modulated generates the second modulation result；And the first modulation result is modulated according to lower sideband complex subcarrier,
And the second modulation result is modulated according to upper side band complex subcarrier, generate corresponding in-phase signal and orthogonal signalling.
Preferably, described device further include: mapping table generation module is used for all CAAnd CBValue be combined,
The corresponding in-phase signal of each combination and orthogonal signalling are obtained by subcarrier-modulated module, generates modulation mapping table.
Preferably, first modulation module includes the first exclusive or device, is used for the dAWith CADXOR operation is carried out, is obtained
To C 'AD；
Second modulation module includes the second exclusive or device, is used for the dBWith CBDXOR operation is carried out, C ' is obtainedBD。
Signal creating method and device of the invention generates baseband complex signal clock, and to the baseband complex signal clock
It is divided to obtain pseudo-code driving clock；Clock driving is driven to generate lower sideband numeric data code C according to the pseudo-codeAD, lower sideband leads
Frequency code CAP, upper side band numeric data code CBDWith upper side band pilot code CBP；According to lower sideband data dAModulate CADIt is logical to obtain lower sideband data
Road baseband signal component C 'AD, and according to upper side band data dBModulate upper side band numeric data code CBDObtain upper side band data channel base band
Signal component C 'BD；From the C 'ADAnd CAPIt is middle select one as lower sideband baseband signal component CA, and from the C 'BDAnd CBP
It is middle select one as upper side band baseband signal component CB；According to the CAAnd CBIt is found in preset modulation mapping table pair
The in-phase signal and orthogonal signalling answered；The frequency in-phase signal and orthogonal signalling being modulated to centered on modulating frequency
On, it generates using modulating frequency as the broadband signal of center frequency；It, can i.e. to four tunnel signal modulations of input to a time multiplexed signal
Flexibly from the C 'ADAnd CAPIt is middle select one as lower sideband baseband signal component CAAnd from the C 'BDAnd CBPOne work of middle selection
For CBIt is multiplexed, is according to actual needs four road signal distribution powers, without making the power of this four roads signal must phase
Together, and this method is simple, it is easy to accomplish.
Detailed description of the invention
Fig. 1 is the flow diagram of the first embodiment of signal creating method of the present invention；
Fig. 2 is the flow diagram of the second embodiment of signal creating method of the present invention；
Fig. 3 is the schematic diagram of cosine binary system subcarrier of the invention；
Fig. 4 is the schematic diagram of sinusoidal binary system subcarrier of the invention；
Fig. 5 is the structural schematic diagram of the first embodiment of signal generating apparatus of the present invention；
Fig. 6 is the structural schematic diagram of the second embodiment of signal generating apparatus of the present invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
Referring to Fig.1, Fig. 1 is the flow diagram of the first embodiment of signal creating method of the present invention, this method comprises:
S10, baseband complex signal clock is generated, and the baseband complex signal clock is divided to obtain pseudo-code driving clock.
The selection of baseband complex signal clock CLK0 is the least common multiple of pseudo-code clock frequency and four times of sub-carrier frequencies
Integral multiple.In one embodiment, pseudo-code clock frequency is 10.23MHz, sub-carrier frequencies 15.345MHz, four times of subcarriers
Frequency is 61.38MHz.The least common multiple of pseudo-code clock frequency and sub-carrier frequencies is 61.38MHz, therefore baseband complex signal
Clock CLK0 can choose 61.38MHz.
In this step, six frequency dividings are carried out to baseband complex signal clock CLK0 and obtains pseudo-code driving clock CLK1, such as work as base
The frequency of band signal clock CLK0 is 61.38MHz, then the frequency of pseudo-code driving clock CLK1 is 10.23MHz, i.e. code frequency fC
For 10.23MHz.
S11, clock CLK1 driving is driven to generate lower sideband numeric data code C according to the pseudo-codeAD, lower sideband pilot code CAP, top
Band numeric data code CBDWith upper side band pilot code CBP。
Drive clock CLK1 that pseudo- code generator is driven to generate the pseudorandom that four different length are 10230 according to the pseudo-code
Code, respectively lower sideband numeric data code CAD, lower sideband pilot code CAP, upper side band numeric data code CBDWith upper side band pilot code CBP, pseudorandom
The value of code is+1 or -1.The period of pseudo noise code is 1ms.
S12, according to lower sideband data dAModulate CADObtain lower sideband data channel baseband signal component C 'AD, and according to upper
Sideband data dBModulate CBDObtain upper side band data channel baseband signal component C 'BD。
Lower sideband data dAIndicate the data bit of lower sideband data channel modulation, upper side band data dBIndicate upper side band data
The data bit of channel modulation.
In one embodiment, according to dAModulate CADObtain C 'AD, and according to dBModulate CBDObtain C 'BDThe step of include: by
The dAWith CADXOR operation is carried out, C ' is obtainedAD；And by the dBWith CBDXOR operation is carried out, C ' is obtainedBD。
S13, from the C 'ADAnd CAPIt is middle select one as lower sideband baseband signal component CA, and from the C 'BDAnd CBPMiddle choosing
It selects one and is used as upper side band baseband signal component CB。
In one embodiment, step S13 includes: S131, by CAPWith a fixed binary sequence CSACarry out exclusive or
Operation obtains lower sideband pilot channel baseband signal component C 'AP；And by CBPWith a fixed binary sequence CSBIt carries out different
Or operation, obtain upper side band pilot channel baseband signal component C 'BP；S132, from the C 'ADAnd C 'APIt is middle select one as CA,
And from the C 'BDAnd C 'BPIt is middle select one as CB.Binary sequence CSAWith binary sequence CSBEach binary digit
Length is the integral multiple of 1ms, and binary sequence CSAWith binary sequence CSBEach binary digit length and two into
Sequence C processedSAWith binary sequence CSBRepetition period can be different.Further, step S132 includes: pre- according to third
If time slot rule is from the C 'ADAnd C 'APIt is middle select one as CA；And according to the 4th default time slot rule from the C 'BDAnd C 'BPIn
Select one as CB。
The third is preset Slot selection rule and the 4th default Slot selection rule and be can be preset, which presets time slot
Selection rule may be the same or different with the 4th default Slot selection rule.
The third presets time slot rule are as follows: and in odd numbered slots, select an input as output, in even timeslots,
Select another input as output, then in the corresponding sideband signals ultimately produced, data-signal and pilot signal will be accounted for respectively
The power of half, such as in odd numbered slots, from C 'AD、C’APMiddle selection C 'ADAs output, in even timeslots, from C 'AD、C’AP
Middle selection C 'APAs output；The third presets time slot rule can be with are as follows: in every m time slot, n time slot of spaced pick (n <
M), by an input as exporting, the other m-n time slot in m time slot inputs another as output, then last
In the corresponding sideband signals generated, the power ratio of output is respectively n/m, 1-n/m, such as in n time slot of every m time slot, from
C’AD、C’APMiddle selection C 'ADAs output, when in m-n time slot of every m time slot, from C 'AD、C’APMiddle selection C 'APAs
Output, then in the corresponding sideband signals ultimately produced, the power ratio of data-signal is n/m, and the power ratio of pilot signal is 1-
n/m。
The third presets Slot selection rule are as follows: in odd numbered slots, selects an input as output, in even timeslots
When, select another input as output, then in the corresponding sideband signals ultimately produced, data-signal and pilot signal will be each
The power for accounting for half, such as in odd numbered slots, from C 'BD、C’BPMiddle selection C 'BDAs output, in even timeslots, from C 'BD、
C’BPMiddle selection C 'BPAs output；The second default time slot rule can be with are as follows: in every m time slot, at spaced pick n
Gap (n < m), by an input as exporting, the other m-n time slot in m time slot inputs another as output, then exists
In the corresponding sideband signals ultimately produced, the power ratio of output is respectively n/m, 1-n/m, such as the n time slot in every m time slot
In, from C 'BD、C’BPMiddle selection C 'BDAs output, when in m-n time slot of every m time slot, from C 'BD、C’BPMiddle selection
C’BPMiddle component is as output, then in the corresponding sideband signals ultimately produced, the power ratio of data-signal is n/m, pilot signal
Power ratio be 1-n/m.
In another embodiment, step S13 include: S133, according to the first default Slot selection rule from the C 'ADWith
CAPIt is middle select one as CA；And according to the second default Slot selection rule from the C 'BDAnd CBPIt is middle select one as CB。
The first default Slot selection rule and the second default Slot selection rule can be preset, the first default time slot
Selection rule may be the same or different with the second default Slot selection rule.
Such as the first default Slot selection rule are as follows: in odd numbered slots, select an input as output, in even timeslots
When, select another input as output, then in the corresponding sideband signals ultimately produced, data-signal and pilot signal will be each
The power for accounting for half, such as in odd numbered slots, from C 'AD、CAPMiddle selection C 'ADAs output, in even timeslots, from C 'AD、CAP
Middle selection CAPAs output；The first default time slot rule can be with are as follows: in every m time slot, n time slot of spaced pick (n <
M), by an input as exporting, the other m-n time slot in m time slot inputs another as output, then last
In the corresponding sideband signals generated, the power ratio of output is respectively n/m, 1-n/m, such as in n time slot of every m time slot, from
C’AD、CAPMiddle selection C 'ADAs output, when in m-n time slot of every m time slot, from C 'AD、CAPMiddle selection CAPAs defeated
Out, then in the corresponding sideband signals ultimately produced, the power ratio of data-signal is n/m, and the power ratio of pilot signal is 1-n/
m。
Such as second default Slot selection rule are as follows: in odd numbered slots, select an input as output, in even number
When gap, select another input as output, then in the corresponding sideband signals ultimately produced, data-signal and pilot signal will
The power for respectively accounting for half, such as in odd numbered slots, from C 'BD、CBPMiddle selection C 'BDAs output, in even timeslots, from C 'BD、
CBPMiddle selection CBPAs output；The second default time slot rule can be with are as follows: in every m time slot, n time slot of spaced pick
(n < m), by an input as exporting, the other m-n time slot in m time slot inputs another as output, then most
In the corresponding sideband signals generated afterwards, the power ratio of output is respectively n/m, 1-n/m, such as in n time slot of every m time slot,
From C 'BD、CBPMiddle selection C 'BDAs output, when in m-n time slot of every m time slot, from C 'BD、CBPMiddle selection CBPIn point
Amount is as output, then in the corresponding sideband signals ultimately produced, the power ratio of data-signal is n/m, the power of pilot signal
Than for 1-n/m.
S14, according to the CAAnd CBCorresponding in-phase signal and orthogonal signalling are found in preset modulation mapping table.
In one embodiment, when sub-carrier frequencies are 15.345MHz, the frequency f of baseband complex signal clock CLK00For son
The quadruple rate of carrier wave.The preset modulation mapping table is as shown in Table 1.CA(t) lower sideband baseband signal component, C are indicatedB(t)
Indicate upper side band baseband signal component, SI(t) in-phase signal, S are indicatedQ(t) orthogonal signalling are indicated.
Table one:
Such as lower sideband baseband signal component currently entered is 0 and upper side band baseband signal component currently entered is 0, is looked into
Find corresponding in-phase signal SI(t) value at four out of phase moment of a sub- carrier cycle be respectively 1, -1, -
1,1, find orthogonal signalling SQ(t) value at four out of phase moment of a sub- carrier cycle is respectively 0,0,0,0.
S15, the in-phase signal and orthogonal signalling are modulated in the frequency centered on modulating frequency, are generated to modulate frequency
Rate is the broadband signal of center frequency.
In this step, the in-phase signal and orthogonal signalling are modulated to modulating frequency fsCentered on frequency on, adjust
The formula of system is SI(t)cos(2πfsT)-SQ(t)sin(2πfsT), it generates with modulating frequency fsBelieve for the broadband of center frequency
Number.
Using above-described embodiment, pseudo-code driving clock is obtained by being divided to baseband complex signal clock；According to described
Pseudo-code drives clock driving to generate lower sideband numeric data code CAD, lower sideband pilot code CAP, upper side band numeric data code CBDWith upper side band pilot tone
Code CBP；According to lower sideband data dAModulate CADObtain lower sideband data channel baseband signal component C 'AD, and according to upper side band number
According to dBModulate upper side band numeric data code CBDObtain upper side band data channel baseband signal component C 'BD；From the C 'ADAnd CAPMiddle selection
One is used as lower sideband baseband signal component CA, and from the C 'BDAnd CBPIt is middle select one as upper side band baseband signal component
CB；According to the CAAnd CBCorresponding in-phase signal and orthogonal signalling are found in preset modulation mapping table；By the same phase
Signal and orthogonal signalling are modulated in the frequency centered on modulating frequency, are generated and are believed by the broadband of center frequency of modulating frequency
Number；It, can be flexibly from the C ' i.e. to four tunnel signal modulations of input a to time multiplexed signalADAnd CAPIt is middle select one as under
Sideband baseband signal component CAAnd from the C 'BDAnd CBPIt is middle select one as CBIt is multiplexed, is according to actual needs four roads letter
Number distribution power, without making the power of this four roads signal must be identical, and this method be simple, it is easy to accomplish.
It is the flow diagram of the second embodiment of signal creating method of the invention referring to Fig. 2, Fig. 2.
Based on the first embodiment of above-mentioned signal creating method, after step s 13, this method further include:
S16, to the CAIt carries out binary modulated and generates the first modulation result, and to the CBIt carries out binary modulated and generates the
Two modulation results.
In this step, to CAAnd CBBinary modulated is carried out respectively, in one embodiment, modulation result is as shown in Table 2,
S1(t) the first modulation result, S are indicated2(t) the second modulation result is indicated.
Table two:
| CA(t) | CB(t) | S1(t) | S2(t) |
| 0 | 0 | 1/2 | 1/2 |
| 0 | 1 | 1/2 | - 1/2 |
| 1 | 0 | - 1/2 | 1/2 |
| 1 | 1 | - 1/2 | - 1/2 |
S17, the first modulation result is modulated according to lower sideband complex subcarrier, and according to upper side band complex subcarrier
Second modulation result is modulated, corresponding in-phase signal and orthogonal signalling are generated.
In this step, step S16 the first modulation result generated and the second modulation result are modulated to lower sideband respectively
And upper side band, modulation formula are as follows: S (t)=S1(t)e*(t)+S1(t) e (t), e* (t) indicate the complex subcarrier of lower sideband, e
(t) complex subcarrier of upper side band, e (t)=SC are indicatedcos(t)+jSCsin(t), e* (t)=SCcos(t)-jSCsin(t), SCcos
(t)=sign (cos (2 π fSCT)), SCsin(t)=sign (sin (2 π fSCT)), wherein SCcos(t) cosine binary system is indicated
Carrier wave, SCsin(t) sinusoidal binary system subcarrier is indicated；fSCFor sub-carrier frequencies, fSC=15.345MHz.Cosine binary system
Carrier wave is as shown in figure 3, the sine binary system subcarrier is as shown in Figure 4.
S (t) is expressed as to the form of real and imaginary parts, S (t)=SI(t)+jSQ(t)=(S1(t)+S2(t))SCcos(t)+
j(S2(t)-S1(t))SCsin(t).The real part S of S (t)I(t) in-phase signal, the imaginary part S of S (t) are indicatedQ(t) orthogonal letter is indicated
Number.Work as S1(t)=1/2, S2(t)=1/2 when, the S (t)=SCcos(t), i.e., orthogonal signalling be 0, check Fig. 3 it can be seen that, S (t)
It is respectively 1, -1, -1,1 in the value at four out of phase moment in a cosine subcarrier period.
S18, the in-phase signal and orthogonal signalling are modulated in the frequency centered on modulating frequency, are generated to modulate frequency
Rate is the broadband signal of center frequency.
In this step, the in-phase signal and orthogonal signalling are modulated to modulating frequency fsCentered on frequency on, adjust
The formula of system is SI(t)cos(2πfsT)-SQ(t)sin(2πfsT), it generates with modulating frequency fsBelieve for the broadband of center frequency
Number.
Further, this method further includes:
S19, by all CAAnd CBValue be combined, each is combined and executes step S16~step S17, is obtained every
It is a to combine corresponding in-phase signal and orthogonal signalling, generate modulation mapping table.
The CACan be with value for 0,1, the CBIt can be with value 0,1, to the CAAnd CBValue carry out any combination, can be obtained four
A combination, respectively (0,0), (0,1), (1,0), (1,1) use the subcarrier-modulated of same way to each combination, execute
Step S16~step S17 obtains the corresponding in-phase signal of each combination and orthogonal signalling, notes down the corresponding same phase of each combination
Signal and orthogonal signalling generate modulation mapping table.It is such as 15.345MHz in sub-carrier frequencies, baseband complex signal clock CLK0's
f0For the quadruple rate of subcarrier, when pseudo-code drives the frequency of clock CLK1 to be 10.23MHz, the modulation mapping table such as table of generation
Shown in one.
According to the combination of different code frequency and sub-carrier frequencies, the frequency f of baseband complex signal0It can choose as code frequency
fCWith four times of sub-carrier frequencies fSCLeast common multiple, such as in the present embodiment, code frequency 10.23MHz, sub-carrier frequencies are
15.345MHz, then the frequency of baseband complex signal can choose as 61.38MHz.Engineering construction personnel can be according to sub-carrier frequencies
fSCTo baseband complex signal f0Different frequency dividing ratios such as construct table one voluntarily according to formula construction look-up table.
Referring to Fig. 5, Fig. 5 is the schematic structural diagram of the first embodiment of signal generating apparatus of the invention, which includes:
Clock generator 19, for generating baseband complex signal clock；
Frequency divider 10 obtains pseudo-code driving clock for being divided to the baseband complex signal clock；
Pseudo- code generator 11, for driving clock driving to generate lower sideband numeric data code C according to the pseudo-codeAD, lower sideband pilot tone
Code CAP, upper side band numeric data code CBDWith upper side band pilot code CBP；
First modulation module 12, for according to lower sideband data dAModulate CADObtain lower sideband data channel baseband signal point
Measure C 'AD；
Second modulation module 13, for according to upper side band data dBModulate CBDObtain upper side band data channel baseband signal point
Measure C 'BD；
First multiplexing selector 14, is used for from the C 'ADAnd CAPIt is middle select one as lower sideband baseband signal component CA；
Second multiplexing selector 15, is used for from the C 'BDAnd CBPIt is middle select one as upper side band baseband signal component CB；
Searching module 16, for according to the CAAnd CBFound in preset modulation mapping table corresponding in-phase signal and
Orthogonal signalling；
Radio-frequency modulator 17, for being modulated to the in-phase signal and orthogonal signalling with modulating frequency fsCentered on frequency
On, it generates using modulating frequency as the broadband signal of center frequency.
Baseband complex signal clock CLK0 is four times of the generation clock of sub-carrier frequencies.In one embodiment, the base band
Complex signal clock CLK0 can choose the clock of 6 × 10.023MHz=61.38MHz.
The selection of baseband complex signal clock CLK0 is the least common multiple of pseudo-code clock frequency and four times of sub-carrier frequencies
Integral multiple.In one embodiment, pseudo-code clock frequency is 10.23MHz, sub-carrier frequencies 15.345MHz, four times of subcarriers
Frequency is 61.38MHz.The least common multiple of pseudo-code clock frequency and sub-carrier frequencies is 61.38MHz, therefore baseband complex signal
Clock CLK0 can choose 61.38MHz.
The frequency divider 10 carries out six frequency dividings to baseband complex signal clock CLK0 and obtains pseudo-code driving clock CLK1, such as works as base band
The frequency of signal clock CLK0 is 61.38MHz, then the frequency of pseudo-code driving clock CLK1 is 10.23MHz, i.e. code frequency fCFor
10.23MHz。
The puppet code generator 11 drives clock CLK1 driving to generate the puppet that four different length are 10230 according to the pseudo-code
Random code, respectively lower sideband numeric data code CAD, lower sideband pilot code CAP, upper side band numeric data code CBDWith upper side band pilot code CBP, pseudo-
The value of random code is+1 or -1.The period of pseudo noise code is 1ms.
Lower sideband data dAIndicate the data bit of lower sideband data channel modulation, upper side band data dBIndicate upper side band data
The data bit of channel modulation.
In one embodiment, which includes the first exclusive or device, is used for the lower dAWith CADCarry out exclusive or
Operation obtains C 'AD；Second modulation module 13 includes the second exclusive or device, is used for the dBWith CBDXOR operation is carried out, is obtained
C’BD。
In one embodiment, which includes the first timeslot multiplex selector, for pre- according to first
If Slot selection rule is from the C 'ADAnd CAPIt is middle select one as CA；
Second multiplexing selector 15 include the second timeslot multiplex selector, for according to the second default Slot selection rule from
The C 'BDAnd CBPIt is middle select one as CB。
The first default Slot selection rule and the second default Slot selection rule can be preset, the first default time slot
Selection rule may be the same or different with the second default Slot selection rule.
Such as the first default Slot selection rule are as follows: in odd numbered slots, select an input as output, in even timeslots
When, select another input as output, then in the corresponding sideband signals ultimately produced, data-signal and pilot signal will be each
The power for accounting for half, such as in odd numbered slots, the first timeslot multiplex selector is from C 'AD、CAPMiddle selection C 'ADAs output, in idol
When number time slot, the first timeslot multiplex selector is from C 'AD、CAPMiddle selection CAPAs output；The first default time slot rule can be with
Are as follows: in every m time slot, n time slot of spaced pick (n < m) regard an input as output, the other m-n in m time slot
A time slot inputs another as output, then in the corresponding sideband signals ultimately produced, the power ratio of output is respectively n/
M, 1-n/m, such as in n time slot of every m time slot, the first timeslot multiplex selector is from C 'AD、CAPMiddle selection C 'ADAs defeated
When out, in m-n time slot of every m time slot, the first timeslot multiplex selector is from C 'AD、CAPMiddle selection CAPAs output, then
In the corresponding sideband signals ultimately produced, the power ratio of data-signal is n/m, and the power ratio of pilot signal is 1-n/m.
Such as second default Slot selection rule are as follows: in odd numbered slots, select an input as output, in even number
When gap, select another input as output, then in the corresponding sideband signals ultimately produced, data-signal and pilot signal will
The power for respectively accounting for half, such as in odd numbered slots, the second timeslot multiplex selector is from C 'BD、CBPMiddle selection C 'BDAs output,
When even timeslots, the second timeslot multiplex selector is from C 'BD、CBPMiddle selection CBPAs output；The second default time slot rule may be used also
With are as follows: in every m time slot, n time slot of spaced pick (n < m) regard an input as output, the other m- in m time slot
N time slot inputs another as output, then in the corresponding sideband signals ultimately produced, the power ratio of output is respectively n/
M, 1-n/m, such as in n time slot of every m time slot, the second timeslot multiplex selector is from C 'BD、CBPMiddle selection C 'BDAs defeated
When out, in m-n time slot of every m time slot, the second timeslot multiplex selector is from C 'BD、CBPMiddle selection CBPMiddle component conduct
Output, then in the corresponding sideband signals ultimately produced, the power ratio of data-signal is n/m, and the power ratio of pilot signal is 1-
n/m。
The searching module 16 is from according to the CAAnd CBCorresponding in-phase signal and just is found in preset modulation mapping table
Hand over signal.
In one embodiment, when sub-carrier frequencies are 15.345MHz, the frequency f of baseband complex signal clock CLK00For son
The quadruple rate of carrier wave.The preset modulation mapping table is as shown in Table 1.CA(t) C is indicatedA, CB(t) upper side band base band letter is indicated
Number component, SI(t) in-phase signal, S are indicatedQ(t) orthogonal signalling are indicated.
Such as C currently enteredAFor 0 and C currently enteredBIt is 0, which finds corresponding in-phase signal SI
(t) value at four out of phase moment of a sub- carrier cycle is respectively 1, -1, -1,1, finds orthogonal signalling SQ
(t) value at four out of phase moment of a sub- carrier cycle is respectively 0,0,0,0.
The in-phase signal and orthogonal signalling are modulated to modulating frequency f by the radio-frequency modulator 17sCentered on frequency on,
The formula of modulation is SI(t)cos(2πfsT)-SQ(t)sin(2πfsT), it generates with modulating frequency fsBelieve for the broadband of center frequency
Number.
Further, device further include: third modulation module and the 4th modulation module；
The third modulation module is used for the CAPWith a fixed binary sequence CSAXOR operation is carried out, is obtained down
Sideband data channel baseband signal component C 'AP；
4th modulation module is used for the CBPWith a fixed binary sequence CSBXOR operation is carried out, is obtained
Sideband data channel baseband signal component C 'BP；
The first multiplexing selector is also used to from the C 'ADAnd C 'APIt is middle select one as lower sideband baseband signal component CA；
The second multiplexing selector, is also used to from the C 'BDAnd C 'BPIt is middle select one as upper side band baseband signal component
CB。
Binary sequence CSAWith binary sequence CSBEach binary digit length be 1ms integral multiple, and two into
Sequence C processedSAWith binary sequence CSBEach binary digit length and binary sequence CSAWith binary sequence CSB's
Repetition period can be different.
In one embodiment, which is also used to preset Slot selection rule according to third from the C 'ADWith
C’APIt is middle select one as lower sideband baseband signal component CA；The second multiplexing selector is also used to according to the 4th default time slot
Selection is regular from the C 'BDAnd C 'BPIt is middle select one as upper side band baseband signal component CB。
The third is preset Slot selection rule and the 4th default Slot selection rule and be can be preset, which presets time slot
Selection rule may be the same or different with the 4th default Slot selection rule.
The third presets time slot rule are as follows: and in odd numbered slots, select an input as output, in even timeslots,
Select another input as output, then in the corresponding sideband signals ultimately produced, data-signal and pilot signal will be accounted for respectively
The power of half, such as in odd numbered slots, from C 'AD、C’APMiddle selection C 'ADAs output, in even timeslots, from C 'AD、C’AP
Middle selection C 'APAs output；The third presets time slot rule can be with are as follows: in every m time slot, n time slot of spaced pick (n <
M), by an input as exporting, the other m-n time slot in m time slot inputs another as output, then last
In the corresponding sideband signals generated, the power ratio of output is respectively n/m, 1-n/m, such as in n time slot of every m time slot, from
C’AD、C’APMiddle selection C 'ADAs output, when in m-n time slot of every m time slot, from C 'AD、C’APMiddle selection C 'APAs
Output, then in the corresponding sideband signals ultimately produced, the power ratio of data-signal is n/m, and the power ratio of pilot signal is 1-
n/m。
The third presets Slot selection rule are as follows: in odd numbered slots, selects an input as output, in even timeslots
When, select another input as output, then in the corresponding sideband signals ultimately produced, data-signal and pilot signal will be each
The power for accounting for half, such as in odd numbered slots, from C 'BD、C’BPMiddle selection C 'BDAs output, in even timeslots, from C 'BD、
C’BPMiddle selection C 'BPAs output；The second default time slot rule can be with are as follows: in every m time slot, at spaced pick n
Gap (n < m), by an input as exporting, the other m-n time slot in m time slot inputs another as output, then exists
In the corresponding sideband signals ultimately produced, the power ratio of output is respectively n/m, 1-n/m, such as the n time slot in every m time slot
In, from C 'BD、C’BPMiddle selection C 'BDAs output, when in m-n time slot of every m time slot, from C 'BD、C’BPMiddle selection
C’BPMiddle component is as output, then in the corresponding sideband signals ultimately produced, the power ratio of data-signal is n/m, pilot signal
Power ratio be 1-n/m.
It is the schematic structural diagram of the second embodiment of signal generating apparatus of the invention referring to Fig. 6, Fig. 6.
Based on the first embodiment of above-mentioned signal generating apparatus, the device further include: subcarrier-modulated module 18, for pair
The CAIt carries out binary modulated and generates the first modulation result, and to the CBIt carries out binary modulated and generates the second modulation result；And
The first modulation result is modulated according to lower sideband complex subcarrier, and the second modulation is tied according to upper side band complex subcarrier
Fruit is modulated, and generates corresponding in-phase signal and orthogonal signalling.
The subcarrier-modulated module 18 is to CAAnd CBBinary modulated is carried out respectively, and in one embodiment, modulation result is as above
It states shown in table two, S1(t) the first modulation result, S are indicated2(t) the second modulation result is indicated.
The first modulation result and the second modulation result that the subcarrier-modulated module 18 will additionally generate are modulated to below respectively
Band and upper side band, modulation formula are as follows: S (t)=S1(t)e*(t)+S1(t) e (t), e* (t) indicate that the complex operator of lower sideband carries
Wave, e (t) indicate the complex subcarrier of upper side band, e (t)=SCcos(t)+jSCsin(t), e* (t)=SCcos(t)-jSCsin(t),
SCcos(t)=sign (cos (2 π fSCT)), SCsin(t)=sign (sin (2 π fSCT)), wherein SCcos(t) indicate cosine two into
Subcarriers, SCsin(t) sinusoidal binary system subcarrier is indicated；fSCFor sub-carrier frequencies, fSC=15.345MHz.The cosine two into
Subcarriers are as shown in figure 3, the sine binary system subcarrier is as shown in Figure 4.
S (t) is expressed as to the form of real and imaginary parts, S (t)=SI(t)+jSQ(t)=(S1(t)+S2(t))SCcos(t)+
j(S2(t)-S1(t))SCsin(t).The real part S of S (t)I(t) in-phase signal, the imaginary part S of S (t) are indicatedQ(t) orthogonal letter is indicated
Number.Work as S1(t)=1/2, S2(t)=1/2 when, the S (t)=SCcos(t), i.e., orthogonal signalling be 0, check Fig. 3 it can be seen that, S (t)
It is respectively 1, -1, -1,1 in the value at four out of phase moment in a cosine subcarrier period.
Further, device further include: mapping table generation module is used for all CAAnd CBValue be combined, lead to
It crosses subcarrier-modulated module 18 and obtains the corresponding in-phase signal of each combination and orthogonal signalling, generate modulation mapping table.
The CACan be with value for 0,1, the CBCan be with value 0,1, the mapping table generation module is to the CAAnd CBValue appointed
Four combinations, respectively (0,0), (0,1), (1,0), (1,1) can be obtained in meaning combination, to each combination using same way
Subcarrier-modulated obtains the corresponding in-phase signal of each combination by subcarrier-modulated module 18 and orthogonal signalling, record is each
Corresponding in-phase signal and orthogonal signalling are combined, modulation mapping table is generated.It is such as 15.345MHz in sub-carrier frequencies, base band is multiple
The f of signal clock CLK00For the quadruple rate of subcarrier, when pseudo-code drives the frequency of clock CLK1 to be 10.23MHz, generation
It is as shown in Table 1 to modulate mapping table.
According to the combination of different code frequency and sub-carrier frequencies, the frequency f of baseband complex signal0It can choose as code frequency
fCWith four times of sub-carrier frequencies fSCLeast common multiple, such as in the present embodiment, code frequency 10.23MHz, sub-carrier frequencies are
15.345MHz, then the frequency of baseband complex signal can choose as 61.38MHz.Engineering construction personnel can be according to sub-carrier frequencies
fSCTo baseband complex signal f0Different frequency dividing ratios such as construct table one voluntarily according to formula construction look-up table.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (9)
1. a kind of signal creating method, which is characterized in that this method comprises:
S10, baseband complex signal clock is generated, and the baseband complex signal clock is divided to obtain pseudo-code driving clock；
S11, clock driving is driven to generate lower sideband numeric data code C according to the pseudo-codeAD, lower sideband pilot code CAP, upper side band data
Code CBDWith upper side band pilot code CBP；
S12, according to lower sideband data dAModulate CADObtain lower sideband data channel baseband signal component C 'AD, and according to upper side band
Data dBModulate upper side band numeric data code CBDObtain upper side band data channel baseband signal component C 'BD；
S13, from the C 'ADAnd CAPIt is middle select one as lower sideband baseband signal component CA, and from the C 'BDAnd CBPMiddle choosing
It selects one and is used as upper side band baseband signal component CB；
S14, according to the CAAnd CBCorresponding in-phase signal and orthogonal signalling are found in preset modulation mapping table；
S15, the in-phase signal and orthogonal signalling are modulated in the frequency centered on modulating frequency, are generated with modulating frequency
For the broadband signal of center frequency；
Wherein, the step S13 includes:
S133, according to the first default Slot selection rule from the C 'ADAnd CAPIt is middle select one as CA；And it is default according to second
Slot selection rule is from the C 'BDAnd CBPIt is middle select one as CB；
First default time slot rule are as follows: in n time slot of every m time slot, from C 'AD、CAPMiddle selection C 'ADAs output, every
When in m-n time slot of m time slot, from C 'AD、CAPMiddle selection CAPAs output, then in the corresponding sideband signals ultimately produced
In, the power ratio of data-signal is n/m, and the power ratio of pilot signal is 1-n/m；
Second default time slot rule are as follows: in n time slot of every m time slot, from C 'BD、CBPMiddle selection C 'BDAs output, every
When in m-n time slot of m time slot, from C 'BD、CBPMiddle selection CBPMiddle component is as output, then in the corresponding edge ultimately produced
In band signal, the power ratio of data-signal is n/m, and the power ratio of pilot signal is 1-n/m.
2. signal creating method as described in claim 1, which is characterized in that before the S133, the S13 further include:
S131, by the CAPWith a fixed binary sequence CSAXOR operation is carried out, lower sideband data channel base band is obtained
Signal component C 'AP；And by the CBPWith a fixed binary sequence CSBXOR operation is carried out, it is logical to obtain upper side band data
Road baseband signal component C 'BP；
Correspondingly, the S133 is specifically included:
S133 ': according to the first default Slot selection rule from the C 'ADAnd C 'APIt is middle select one as CA；And it is pre- according to second
If Slot selection rule is from the C 'BDAnd C 'BPIt is middle select one as CB；
First default time slot rule are as follows: in n time slot of every m time slot, from C 'AD、C’APMiddle selection C 'ADAs output,
When in m-n time slot of every m time slot, from C 'AD、C’APMiddle selection CAPAs output, then take a message in the corresponding edge ultimately produced
In number, the power ratio of data-signal is n/m, and the power ratio of pilot signal is 1-n/m；
Second default time slot rule are as follows: in n time slot of every m time slot, from C 'BD、C’BPMiddle selection C 'BDAs output,
When in m-n time slot of every m time slot, from C 'BD、C’BPMiddle selection C 'BPMiddle component is as output, then in the phase ultimately produced
It answers in sideband signals, the power ratio of data-signal is n/m, and the power ratio of pilot signal is 1-n/m.
3. such as the described in any item signal creating methods of claim 1 to 2, which is characterized in that, should after the step S13
Method further include:
S16, to the CAIt carries out binary modulated and generates the first modulation result, and to the CBIt carries out binary modulated and generates the
Two modulation results；
S17, the first modulation result is modulated according to lower sideband complex subcarrier, and according to upper side band complex subcarrier to
Two modulation results are modulated, and generate corresponding in-phase signal and orthogonal signalling；
S18, the in-phase signal and orthogonal signalling are modulated in the frequency centered on modulating frequency, are generated with modulating frequency
For the broadband signal of center frequency.
4. signal creating method as claimed in claim 3, which is characterized in that the method also includes:
S19, by all CAAnd CBValue be combined, according to the formula of subcarrier-modulated, each is combined and executes step
S16~step S17 obtains the corresponding in-phase signal of each combination and orthogonal signalling, generates modulation mapping table.
5. the signal creating method as described in claim 1,2 or 4, which is characterized in that the step S12 includes:
S121, by the dAWith CADXOR operation is carried out, C ' is obtainedAD；And by the dBWith CBDXOR operation is carried out, C ' is obtainedBD。
6. a kind of signal generating apparatus, which is characterized in that the device includes:
Clock generator, for generating baseband complex signal clock；
Frequency divider obtains pseudo-code driving clock for being divided to the baseband complex signal clock；
Pseudo- code generator, for driving clock driving to generate lower sideband numeric data code C according to the pseudo-codeAD, lower sideband pilot code CAP、
Upper side band numeric data code CBDWith upper side band pilot code CBP；
First modulation module, for according to lower sideband data dAModulate CADObtain lower sideband data channel baseband signal component C 'AD；
Second modulation module, for according to upper side band data dBModulate CBDObtain upper side band data channel baseband signal component C 'BD；
First multiplexing selector, is used for from the C 'ADAnd CAPIt is middle select one as lower sideband baseband signal component CA；
Second multiplexing selector, is used for from the C 'BDAnd CBPIt is middle select one as upper side band baseband signal component CB；
Searching module, for according to the CAAnd CBCorresponding in-phase signal and orthogonal is found in preset modulation mapping table
Signal；
Radio-frequency modulator, for being modulated to the in-phase signal and orthogonal signalling with modulating frequency fsCentered on frequency on, it is raw
At using modulating frequency as the broadband signal of center frequency；
Wherein, the first multiplexing selector includes the first timeslot multiplex selector, for being advised according to the first default Slot selection
Then from the C 'ADAnd CAPIt is middle select one as CA；
Second multiplexing selector includes the second timeslot multiplex selector, for according to the second default Slot selection rule from described
C’BDAnd CBPIt is middle select one as CB；
First default time slot rule are as follows: in n time slot of every m time slot, from C 'AD、CAPMiddle selection C 'ADAs output, every
When in m-n time slot of m time slot, from C 'AD、CAPMiddle selection CAPAs output, then in the corresponding sideband signals ultimately produced
In, the power ratio of data-signal is n/m, and the power ratio of pilot signal is 1-n/m；
Second default time slot rule are as follows: in n time slot of every m time slot, from C 'BD、CBPMiddle selection C 'BDAs output, every
When in m-n time slot of m time slot, from C 'BD、CBPMiddle selection CBPMiddle component is as output, then in the corresponding edge ultimately produced
In band signal, the power ratio of data-signal is n/m, and the power ratio of pilot signal is 1-n/m.
7. signal generating apparatus as claimed in claim 6, which is characterized in that described device further includes third modulation module and
Four modulation modules；
The third modulation module is used for the CAPWith a fixed binary sequence CSAXOR operation is carried out, is obtained down
Sideband data channel baseband signal component C 'AP；
4th modulation module is used for the CBPWith a fixed binary sequence CSBXOR operation is carried out, is obtained
Sideband data channel baseband signal component C 'BP；
Correspondingly, the first multiplexing selector, is also used to preset Slot selection rule according to third from the C 'ADAnd C 'APIn
Select one as CA；
Second multiplexing selector, is also used to according to the 4th default Slot selection rule from the C 'BDAnd C 'BPIt is middle select one as
CB；
Third presets time slot rule are as follows: in n time slot of every m time slot, from C 'AD、C’APMiddle selection C 'ADAs output,
When in m-n time slot of every m time slot, from C 'AD、C’APMiddle selection CAPAs output, then take a message in the corresponding edge ultimately produced
In number, the power ratio of data-signal is n/m, and the power ratio of pilot signal is 1-n/m；
4th default time slot rule are as follows: in n time slot of every m time slot, from C 'BD、C’BPMiddle selection C 'BDAs output,
When in m-n time slot of every m time slot, from C 'BD、C’BPMiddle selection C 'BPMiddle component is as output, then in the phase ultimately produced
It answers in sideband signals, the power ratio of data-signal is n/m, and the power ratio of pilot signal is 1-n/m.
8. such as the described in any item signal generating apparatus of claim 6 to 7, which is characterized in that described device further include:
Subcarrier-modulated module, for the CAIt carries out binary modulated and generates the first modulation result, and to the CBCarry out two
Ary modulation generates the second modulation result；And the first modulation result is modulated according to lower sideband complex subcarrier and root
The second modulation result is modulated according to upper side band complex subcarrier, generates corresponding in-phase signal and orthogonal signalling.
9. such as the described in any item signal generating apparatus of claim 6 to 7, which is characterized in that first modulation module includes
First exclusive or device is used for the dAWith CADXOR operation is carried out, C ' is obtainedAD；
Second modulation module includes the second exclusive or device, is used for the dBWith CBDXOR operation is carried out, C ' is obtainedBD。
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