CN109246041A - A kind of compound text signal broadcast control method of R-CSK dual rate - Google Patents
A kind of compound text signal broadcast control method of R-CSK dual rate Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/20—Modulator circuits; Transmitter circuits
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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- H04B1/707—Spread spectrum techniques using direct sequence modulation
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Abstract
The present invention relates to a kind of compound text signal broadcast control method of R-CSK dual rate, include the following steps: firstly, using default key modulation method, carrying out DSSS direct sequence spread spectrum with phase I branch road for basic text, constructing with phase I branch baseband signal；Meanwhile orthogonal Q branch road, using default key modulation method, the code for be repeated several times phase shift for extension text moves keying modulation, obtains pseudorandom spreading sequence, i.e., orthogonal Q branch baseband signal, wherein, the code phase of pseudorandom spreading sequence is controlled by extension text；Then, for same phase I branch baseband signal and orthogonal Q branch baseband signal, it carries out IQ orthogonal modulation and obtains intercarrier signal, upconversion process is carried out for intercarrier signal again, obtain radio-frequency carrier signal, it is most handled afterwards through power amplification, constitutes the compound telegraph signal of dual rate, transmitting antenna is transferred to be broadcast.Information distributing rate can be effectively promoted through the invention, and improves signal broadcast efficiency.
Description
Technical field
The present invention relates to a kind of compound text signal broadcast control methods of R-CSK dual rate, belong to communication, navigation signal is set
Count technical field.
Background technique
In contemporary communication, Navigation System Design, according to the difference of application demand, the signal in same frequency point is generally required
In broadcast the compound text for meeting different requirements simultaneously.Such as: broadcasting basic text by certain information rate, meet system and take substantially
The requirement of performance of being engaged in or open service performance, while the identical or different extension text of information rate is broadcast, it is additional to meet system
The requirement of service performance or non-public service performance.Due to extending telegraph signal not necessarily full disclosure, system requirements design
Compound telegraph signal, it is ensured that for basic text user in the case where not knowing to extend telegraph signal presence or absence, performance is fully
Receive the basic text in compound telegraph signal.
For the communication using DS spread spectrum signal system, navigation system, the rate for broadcasting text is generally less than spread spectrum
The inverse in code period.For example, the spreading code period of the GPS L1 C/A code in the U.S. is 1ms, the rate of navigation message is 50bps
[referring to ICD-GPS-200C]；The spreading code period of WAAS satellite navigation satellite-based augmentation system is 1ms, and the rate of navigation message is
500sps [refers to RTCA DO-229D-2006].If promoting text broadcasts rate it is necessary to shorten the code length of spreading code, or
Polarity upset is multiple in one code period, can reduce correlation properties when signal is received and tracked in this way, damage signal acceptance
Energy.
On the other hand, the day that keying modulation mode (abbreviation CSK modulation system) broadcasts text is moved for equally using code
The quasi- zenith satellite navigation system of this QZSS, in order to provide necessary spreading code chip and code cycle time information to CSK demodulation,
QZSS system devises the dedicated pilot channel for not broadcasting text, pilot channel letter in the L6 signal for broadcasting CSK modulation text
Number signal is broadcast with text and combine using TDM time division multiplexing mode, broadcast in same carrier phase and [refer to IS-QZSS
Ver.1.6]。
Document 1 is [with reference to the China national patent of invention number of accepting: it is compound 201810947305.1] to propose a kind of dual rate
Telegraph signal broadcasts control method, and the base band letter of the different text rates of BPSK carrier modulation is respectively adopted in IQ quadrature branch
Number, I branch modulates basic text using DSSS direct sequence spread spectrum mode, and Q branch moves keying mode using CSK code and modulates extension electricity
Text, two branches can configure different power ratios, to adapt to the requirement of different text transmission rates.Document 2 is [with reference to China
The national inventing patent number of accepting: a kind of code shifting key modulation method (letter that phase shift is repeated several times 201811042847.0] is proposed
Claim R-CSK modulator approach), phase pushing figure is generated according to the content of transmitting text, in an information transmission symbol time, weight
The pseudo-random sequence of the same phase pushing figure of repetitive generation is multiple, can obtain higher effective information transmission rate.
The present invention introduces what document 2 proposed on the basis of the compound text of dual rate that document 1 proposes broadcasts control method
The code that phase shift is repeated several times moves key modulation method, improves the conventional CSK modulator approach used in document 1, can obtain more preferable
The compound text information transmission performance of dual rate.
Summary of the invention
Technical problem to be solved by the invention is to provide one kind can effectively solve the problem that communication, in navigation system application to more
The compound text signal broadcast control method of the dual rate of type text demand for services.
In order to solve the above-mentioned technical problem, the invention adopts the following technical scheme:
A kind of compound text signal broadcast control method of R-CSK dual rate realizes dual rate using IQ two-way orthogonal modulation
Broadcasting for compound telegraph signal, includes the following steps:
Firstly, using default key modulation method, carrying out DSSS direct sequence spread spectrum, structure for basic text with phase I branch road
Build same phase I branch baseband signal；
Meanwhile orthogonal Q branch road for extension text carries out that phase shift is repeated several times using default key modulation method
Code moves keying modulation, obtains pseudorandom spreading sequence, i.e., orthogonal Q branch baseband signal, wherein the code phase of pseudorandom spreading sequence
Position is controlled by extension text；
Then, it for same phase I branch baseband signal and orthogonal Q branch baseband signal, carries out IQ orthogonal modulation and obtains intermediate frequency
Carrier signal, then for intercarrier signal carry out upconversion process, obtain radio-frequency carrier signal, most afterwards through power amplification at
Reason constitutes the compound telegraph signal of dual rate, transmitting antenna is transferred to be broadcast.
As a preferred technical solution of the present invention: in the above-mentioned compound text signal broadcast method of R-CSK dual rate, together
Phase I branch road, constructs same phase I branch baseband signal as follows:
Firstly, carrying out the bit stream D after channel coding is encoded for basic textB(t)；
Then, basic text spreading code cycle clock and Chip clock according to provided by timing sequencer, by substantially electric
Literary spectrum-spreading code generator generates basic text spread spectrum codes CB(t), using default key modulation method, for obtained basic text pair
The bit stream D answeredB(t) direct-sequence spread-spectrum modulation is carried out, updating bit stream corresponding to basic text is CB(t)·DB(t)；
Finally, in conjunction with basic text power ratio coefficient A is presetI, by SI(t)=AI·CB(t)·DB(t), it obtains with phase I
Branch baseband signal SI(t)。
As a preferred technical solution of the present invention: in the above-mentioned compound text signal broadcast method of R-CSK dual rate, just
Q branch road is handed over, constructs orthogonal Q branch baseband signal as follows:
Firstly, carrying out the bit stream after channel coding is encoded for extension text；
Secondly, according to the extension text symbol clock that timing sequencer provides, to corresponding bit after extension message coding
Stream carries out 1- > KRBit serial/parallel conversion, obtains parallel data stream；Wherein every KR- bit parallel data duration (symbol time
Length) it is equal to N times of extension text spreading code cycle time；
Then, the extension text spreading code cycle clock provided according to timing sequencer is generated simultaneously by Selecting phasing module
Phase pushing figure corresponding to row data flow；
Finally, extension text code cycle clock, Chip clock and parallel data stream according to provided by timing sequencer
Corresponding phase pushing figure, and extension text is expanded using default key modulation method by extension text spectrum-spreading code generator
The extension text spreading code that frequency code generator generates, which is repeated as many times, carries out code shifting keying modulation, obtains modulated extension text and expands
Frequency code signalAnd combine default extension text power ratio coefficient AQ, pressIt obtains pseudo-
Random frequency expansion sequence SQ(t), i.e., orthogonal Q branch baseband signal SQ(t), wherein the code phase of pseudorandom spreading sequence is by extension electricity
Text control, (AI)2+(AQ)2=1.
As a preferred technical solution of the present invention: the extension text symbol clock is extension text code cycle clock
Integral multiple, and with extension text code cycle clock it is synchronous.
In addition, as a preferred technical solution of the present invention: the default key modulation method is BPSK binary system phase
Move keyed carrier modulation or the M-ary orthogonal signal modulation mode of other congruence properties.
The compound text signal broadcast control method of R-CSK dual rate of the invention compared with prior art, has following excellent
Different effect:
The compound text signal broadcast control method of R-CSK dual rate of the invention, using IQ two-way orthogonal modulation, wherein together
Phase I branch road uses BPSK binary phase shift keying carrier modulation, and baseband signal is the basic text by DSSS direct sequence spread spectrum；
Orthogonal Q branch road uses BPSK binary phase shift keying carrier modulation, and baseband signal is to move key by the code of phase shift is repeated several times
The code phase of the pseudorandom spreading sequence of control, pseudo-random sequence is controlled by the extension text broadcast；In spread spectrum code length or week
Phase under the same conditions, using CSK modulation system, can obtain text more higher than DSSS direct sequence spread spectrum and broadcast rate；This hair
It is bright to broadcast effective information rate compared with conventional CSK modulating system due to moving keying modulation using the code that phase shift is repeated several times
In identical situation, the demodulation performance of receiver can be effectively promoted；Can while improving CSK modulation intelligence transmission rate,
It keeps receiving end signal power density constant, avoids hardware and software cost and power consumption that receiving end demodulation CSK text is significantly increased；This
Invention can be the different electricity substantially of text rate since basic text and extension text to be individually placed to orthogonal IQ branch road
Literary signal and extension telegraph signal configure different power ratios, improve signal broadcast efficiency；Due to IQ path quadrature, carrier wave phase
90 degree of phase difference, it can effectively avoid influence of the powerful extension telegraph signal to basic telegraph signal receptivity；In I branch
On broadcast bpsk signal, may be either synchronizing information needed for Q branch provides CSK demodulation, and can effectively broadcast basic text；Due to
Basic telegraph signal is different from extension telegraph signal spreading code and multicarrier orthogonal, the system user that need to only receive basic text are not necessarily to
The presence for considering extension text, can simplify the design of basic text receiver, reduces the cost of basic text receiver.This hair
Bright method is suitable for the fields such as communication, Navigation System Design.
Detailed description of the invention
Fig. 1 is broadcasting method block diagram in the compound text signal broadcast control method of R-CSK dual rate of the invention；
Fig. 2 is the sequential relationship of each component of I branch baseband signal；
Fig. 3 is the sequential relationship of each component of Q branch baseband signal；
Fig. 4 is the planisphere of complex base band signal；
Fig. 5 is basic telegraph signal receiving mechanism into figure；
Fig. 6 is compound text signal coherence receiving mechanism into figure；
Fig. 7 is compound text signal incoherent receiving mechanism into figure；
Fig. 8 is that comb filter constitutes figure；
Fig. 9 is routine CSK modulation timing figure；
Figure 10 is the information transmission error rates of R-CSK of the present invention and the effect contrast figure of the routine CSK information bit error rate.
Specific embodiment
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawings of the specification.
The compound text signal broadcast control method of R-CSK dual rate of the invention, in practical application, as shown in Figure 1,
Using IQ two-way orthogonal modulation, broadcasting for the compound telegraph signal of dual rate is realized.
Firstly, using default key modulation method, carrying out DSSS direct sequence spread spectrum, structure for basic text with phase I branch road
Build same phase I branch baseband signal.
Meanwhile orthogonal Q branch road for extension text carries out that phase shift is repeated several times using default key modulation method
Code moves keying modulation, obtains pseudorandom spreading sequence, i.e., orthogonal Q branch baseband signal, wherein the code phase of pseudorandom spreading sequence
Position is controlled by extension text.
Building for above-mentioned same phase I branch baseband signal and orthogonal Q branch baseband signal, respectively by following each method
It realizes.
Wherein, for the building of same phase I branch baseband signal, the specific method is as follows:
Firstly, carrying out the bit stream D after channel coding is encoded for basic textB(t)；
Then, (the referred to as basic text code in Fig. 1 of the basic text spreading code cycle clock according to provided by timing sequencer
Cycle clock) and Chip clock, basic text spread spectrum codes C is generated by basic text spectrum-spreading code generatorB(t), using preset key
Modulator approach is controlled, for the corresponding bit stream D of obtained basic textB(t) direct-sequence spread-spectrum modulation is carried out, it is right to update basic text institute
The bit stream answered is CB(t)·DB(t)；
As shown in Fig. 2, giving the sequential relationship of each component of same phase I branch baseband signal, basic text clock time is long
Degree is TBS=1ms, the grouped coding of the information of basic text and synthesis speed R after channel codingB=1/TBS=1kbps, value
Positive and negative 1 bit stream DB(t).Basic text spread spectrum codes CB(t) bit rate is 10.23MHz, basic text spreading code cycle time
Length TBC=1ms, value positive and negative 1.Text and the corresponding relationship of pseudo-random sequence are 1- > " PRN (0)+", -1- > " PRN (0)-",
Wherein, " PRN (0)+" indicates that initial phase is 0 positive polarity pseudo-random sequence, " PRN (0)-" indicate initial phase be 0 it is negative
Polarity pseudo-random sequence.
Finally, in conjunction with basic text power ratio coefficient A is presetI, by SI(t)=AI·CB(t)·DB(t), it obtains with phase I
Branch baseband signal SI(t)。
For the building of orthogonal Q branch baseband signal, the specific method is as follows:
Firstly, carrying out the bit stream after channel coding is encoded for extension text；
Secondly, according to the extension text symbol clock that timing sequencer provides, to corresponding bit after extension message coding
Stream carries out 1- > KRBit serial/parallel conversion, obtains parallel data stream；Wherein every KR- bit parallel data duration (symbol time
Length) it is equal to N times of extension text spreading code cycle time；
Then, the extension text spreading code cycle clock provided according to timing sequencer (referred to as extends text code in Fig. 1
Cycle clock), phase pushing figure corresponding to parallel data stream is obtained as Selecting phasing module；
Fig. 3 gives the sequential relationship of orthogonal each component of Q tributary signal, extends text symbol clock time span TESIt is equal to
Extend text spreading code cycle clock time span TECN times, using KR- bit indicates that a symbol, extension textual information are broadcast
Rate RE=KR/TES, KRThe initial phase of the corresponding PRN of-bit is expressed as decimal value range and isCan at most it indicateA phase.Without loss of generality, illustrate conveniently to be subsequent,
N=2 is set, text spreading code cycle clock time span T is extendedEC=1ms indicates a symbol using 4-bit, extends text
Information distributing rate RE=4/TESIt is M that the initial phase that=2kbps, 4-bit correspond to PRN, which is expressed as decimal value,R=0,
1 ..., 15,2 identical pseudo-random sequences (i.e. 4-bit text (m) and N number of PRN in Fig. 3 are modulated with identical phase reappearance
(m) corresponding), the identical pseudo-random sequence of 2 initial phases is linked in sequence, new modulation symbol is formed, completes to be repeated several times
The code of phase shift moves keying modulation.4-bit text (m) only one embodiment of the present of invention corresponding with PRN (m) in Fig. 3, can also be with
For other corresponding relationships.
Finally, extension text code cycle clock, Chip clock and parallel data stream according to provided by timing sequencer
Corresponding phase pushing figure, and extension text is expanded using default key modulation method by extension text spectrum-spreading code generator
The extension text spreading code that frequency code generator generates, which is repeated as many times, carries out code shifting keying modulation, obtains modulated extension text and expands
Frequency code signalAnd combine default extension text power ratio coefficient AQ, pressIt obtains pseudo-
Random frequency expansion sequence SQ(t), i.e., orthogonal Q branch baseband signal SQ(t), wherein the code phase of pseudorandom spreading sequence is by extension electricity
Text control.
(AI)2+(AQ)2=1
As shown in figure 4, giving when settingWhen, the planisphere of complex base band signal only gives here
One example, power ratio relationship corresponding relationship without being limited thereto.
In this example of the invention, the code length of extension text spreading code is 10230 chips.KRSelection byLimitation, KRMaximum desirable 13, i.e., the maximum character rate that text is extended in this example is 13ksps.It does not examine
In the case where considering basic text and extension text channel coding difference, to guarantee to obtain same text solution tonality in receiving end
Can, branch generally high to text rate configures higher signal broadcast power.
Two branches use different spread spectrum code sequences.When text rate difference, IQ branch can distribute different hairs
Power is penetrated, so that basic text and extension text that receiving end receives have same receptivity.Broadcast signal IQ two-way
Spreading code keeps synchronous with text each other.
Then for same phase I branch baseband signal SI(t) with orthogonal Q branch baseband signal SQ(t) complex expression is as follows:
S (t)=SI(t)+jSQ(t)
Wherein, j is imaginary number.
Default key modulation method mentioned in the above method be BPSK binary phase shift keying carrier modulation or other
The M-ary orthogonal signal modulation mode of congruence property.
Then, it for same phase I branch baseband signal and orthogonal Q branch baseband signal, carries out IQ orthogonal modulation and obtains intermediate frequency
Carrier signal, then for intercarrier signal carry out upconversion process, obtain radio-frequency carrier signal, most afterwards through power amplification at
Reason constitutes the compound telegraph signal of dual rate, transmitting antenna is transferred to be broadcast.
Here the radio frequency transmissions of the compound telegraph signal of dual rate are expressed as follows:
Wherein, PsIndicate compound text emission of radio frequency signals general power, fcIndicate emission signal frequency.
In the compound text signal broadcast control method of a kind of R-CSK dual rate that the present invention designs, by basic text and expansion
Exhibition text is individually placed to orthogonal IQ branch road, promotes broadcasting rate only and need to promoting the function of extension telegraph signal for extension text
Rate improves signal broadcast efficiency；IQ path quadrature, carrier phase differ 90 degree, can effectively avoid powerful extension text
Influence of the signal to basic telegraph signal receptivity；The bpsk signal broadcast on I branch road may be either that Q branch provides CSK solution
Synchronizing information needed for adjusting, and can effectively broadcast basic text；Key modulation techniques are moved using the code that phase shift is repeated several times, it can be with
Information distributing rate is effectively promoted, signal broadcast efficiency is further improved.
For the compound text signal broadcast control method of R-CSK dual rate of above-mentioned design, the present invention is further devised
Basic text method of reseptance, R-CSK dual rate are multiple in composite signal method of reseptance, including the compound telegraph signal of R-CSK dual rate
It closes coherent demodulation in telegraph signal and extends non-coherent demodulation in text method of reseptance and the compound telegraph signal of R-CSK dual rate
Extend text method of reseptance；Wherein, basic text method of reseptance in the compound telegraph signal of R-CSK dual rate, as shown in figure 5, tool
Body is as follows:
The received radio-frequency carrier signal of receiver antenna is by radio-frequency front-end (RF Front-End) processing output number
Frequency signal；Digital medium-frequency signal exports orthogonal IQ two-way baseband signal, IQ two-way with the carrier frequency mixing of carrier wave circle replication first
Basic text spreading code of the baseband signal respectively with the duplication of basic text spectrum-spreading code generator carries out related calculation, and obtains IQ two-way phase
Close result；Then, input of the IQ two-way correlated results as phase demodulation filter module, phase demodulation filter module calculate carrier wave phase demodulation error
With code phase demodulation error, and phase demodulation error is filtered, filter result be respectively intended to adjust carrier wave NCO (Carrier NCO) and
Code NCO (Code NCO), the carrier wave for exporting Carrier NCO is consistent with carrier wave is received, and expands basic text
The basic text spreading code that frequency code generator replicates under Code NCO control is consistent with basic text spreading code is received, and is protected
Carrier wave and spreading code in card subsequent time reception signal are still thoroughly removed in track loop；I branch correlator is defeated simultaneously
Correlated results out exports basic telegraph text data bit through the judgement of basic text judging module.
Coherent demodulation extends text method of reseptance in the compound telegraph signal of R-CSK dual rate, as shown in fig. 6, specific as follows:
When demodulating basic text, will synchronize obtain afterwards with receive the synchronous extension text spreading code cycle clock of signal,
Chip clock passes to extension text spectrum-spreading code generator and coherent matched filter module, by extension text symbol clock and extension
Text spreading code cycle clock passes to comb filter；Q branch baseband signal passes to comb filter, and comb filter will
N group pseudo-random sequence data investigation in same symbol is 1 group of pseudo-random sequence data；
Wherein, it is as shown in Figure 8 to constitute block diagram for comb filter: comb filter is in extension text spreading code cycle clock
Under control, by input data sequential time delay N-1 times, each delay spread text spreading code cycle time TECSecond, then by N-1 times
Delay data gives data cutout module after being superimposed with input data；Secondly, data cutout module is in extension text symbol clock
Under control with extension text spreading code cycle clock, input traffic is intercepted, exports the number for being superimposed n times in same symbol
According to data time length is extension text spreading code cycle time TECSecond.Data intercept is conveyed to coherent matched filter module.
Then, control of the coherent matched filter module in extension text symbol clock and extension text spreading code cycle clock
Under, it is T by the time span receivedECData block and extension text spectrum-spreading code generator when extending the text spreading code period
The extension text spreading code generated under clock and Chip clock control carries out relevant matches calculating, and correlated results is exported to be searched to relevant peaks
Rope module, the corresponding local extension text of search relevant peaks spread code phase, and are bit data output by phase transition；
Finally, the bit data that relevant peaks search module exports is passed through the extension text that channel decoding module is transmitted
Data.
Non-coherent demodulation extends text method of reseptance in the compound telegraph signal of R-CSK dual rate, as shown in fig. 7, specifically such as
Under:
When demodulating basic text, will synchronize obtain afterwards with receive the synchronous extension text spreading code cycle clock of signal,
Chip clock passes to extension text spectrum-spreading code generator and incoherent matched filtering module, by extension text symbol clock and expansion
Exhibition text spreading code cycle clock passes to comb filter；Baseband I Q two paths of signals passes to comb filter, comb filtering
N group pseudo-random sequence data investigation in same symbol is 1 group of pseudo-random sequence data by device；
Wherein, it is as shown in Figure 8 to constitute block diagram for comb filter: comb filter is in extension text spreading code cycle clock
Under control, by input data sequential time delay N-1 times, each delay spread text spreading code cycle time TECSecond, then by N-1 times
Delay data gives data cutout module after being superimposed with input data；Secondly, data cutout module is in extension text symbol clock
Under control with extension text spreading code cycle clock, input traffic is intercepted, exports the number for being superimposed n times in same symbol
According to data time length is extension text spreading code cycle time TECSecond.Data intercept is conveyed to incoherent matched filtering module.
Then, control of the incoherent matched filtering module in extension text symbol clock and extension text spreading code cycle clock
It is T by the time span received under systemECData block and extension text spectrum-spreading code generator extension the text spreading code period
The extension text spreading code generated under clock and Chip clock control carries out relevant matches calculating, and correlated results is exported to relevant peaks
Search module, the corresponding local extension text of search relevant peaks spread code phase, and are bit data output by phase transition；
Finally, the bit data that relevant peaks search module exports is passed through the extension text that channel decoding module is transmitted
Data.
It is effective compared to routine CSK modulation using R-CSK modulation in order to more intuitively embody Q branch proposed by the present invention
Property, Figure 10 give the information transmission error rates of R-CSK of the present invention and the effect contrast figure of the routine CSK information bit error rate, for
Conventional CSK and R-CSK transmit information rate it is consistent under the conditions of bit error rate performance carry out theoretical calculation, related symbol and right
It should be related to and agree as follows:
Fig. 9 gives conventional CSK modulation timing figure, and in conventional CSK, extension text spreading code cycle time is TEC, code
Leaf length is L, and symbol time length is TES, wherein TES=TEC, a symbol is indicated using K-bit, then system M=2K, information
Rate RE=K/TES；It is M=0,1 that the initial phase that K-bit corresponds to PRN, which is expressed as decimal value range, ..., 2K- 1, i.e., most
It can mostly indicate 2K- 1 phase is modulated pseudo-random sequence with the initial phase that K-bit symbol indicates, completes CSK tune
System.In Fig. 9 by taking K=2 as an example, 2-bit text (m) only one embodiment of the present of invention corresponding with PRN (m), or its
Its corresponding relationship.
The coherent demodulation symbol error rate calculation formula of conventional CSK modulation is as follows:
The formula for being scaled the information bit bit error rate is as follows:
In R-CSK, extension text spreading code cycle time is TEC, chip lengths L, symbol time length is TES,R,
Using KR- bit indicates a symbol, and number of repetition N is consistent with routine CSK transmission information rate to reach, and need to meet KR=
NK,TES,R=NTES, then system MR=2NK=MN, information rate RE,R=KR/TES,R=NK/NTEC=K/TES=RE；
By the M of R-CSKRBring the coherent demodulation symbol error rate calculation formula of CSK modulation into, then available R-CSK
Coherent demodulation symbol error rate calculation formula:
The formula for being scaled the information bit bit error rate is as follows:
K=2 (i.e. M=4), N=2 (i.e. M are taken without loss of generality for convenience of calculationR=16) it is emulated, Contrast on effect
Figure is as shown in Figure 10, it can be seen that in identical information transmission rate and identical Eb/N0In the case where bit energy-to-noise density ratio,
What the more conventional CSK modulator approach of the coherent demodulation information bit bit error rate that R-CSK modulator approach proposed by the present invention obtains obtained
The coherent demodulation information bit bit error rate is low, and transmission performance is more preferable.Same conclusion can also modulate the letter of non-coherent demodulation from CSK
Bit error rate calculation formula is ceased to obtain.It can be extrapolated from Figure 10, in the identical situation of the information bit bit error rate, the present invention
Bit energy needed for the R-CSK modulator approach transmission information of proposition is less.Or it can be said that in the information bit bit error rate and letter
It ceases in the identical situation of bit energy, the available higher rate of information throughput of R-CSK modulator approach proposed by the present invention.
In aforementioned present invention example, basic text bit width is equal to basic text spreading code period, extension text spread spectrum
The code period is equal to the basic text spreading code period, this is an application example of the invention, basic text bit width, basic
Text spreading code period, extension text spreading code period can be set to any relationship of coherent synchronization each other
Embodiments of the present invention are explained in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned implementations
Mode within the knowledge of a person skilled in the art can also be without departing from the purpose of the present invention
It makes a variety of changes.
Claims (5)
1. a kind of compound text signal broadcast control method of R-CSK dual rate, it is characterised in that: IQ two-way orthogonal modulation is applied,
It realizes broadcasting for the compound telegraph signal of dual rate, includes the following steps:
Firstly, using default key modulation method, carrying out DSSS direct sequence spread spectrum for basic text, building is same with phase I branch road
Phase I branch baseband signal；
Meanwhile orthogonal Q branch road, using default key modulation method, the code for be repeated several times phase shift for extension text is moved
Keying modulation, obtain pseudorandom spreading sequence, i.e., orthogonal Q branch baseband signal, wherein the code phase of pseudorandom spreading sequence by
Extend text control；
Then, it for same phase I branch baseband signal and orthogonal Q branch baseband signal, carries out IQ orthogonal modulation and obtains IF carrier
Signal, then upconversion process is carried out for intercarrier signal, radio-frequency carrier signal is obtained, is most handled afterwards through power amplification, structure
At dual rate compound electric text signal, transmitting antenna is transferred to be broadcast.
2. the compound text signal broadcast control method of a kind of R-CSK dual rate according to claim 1, it is characterised in that:
With phase I branch road, same phase I branch baseband signal is constructed as follows:
Firstly, carrying out the bit stream D after channel coding is encoded for basic textB(t)；
Then, basic text spreading code cycle clock and Chip clock according to provided by timing sequencer, are expanded by basic text
Frequency code generator generates basic text spread spectrum codes CB(t), corresponding for obtained basic text using default key modulation method
Bit stream DB(t) direct-sequence spread-spectrum modulation is carried out, updating bit stream corresponding to basic text is CB(t)·DB(t)；
Finally, in conjunction with basic text power ratio coefficient A is presetI, by SI(t)=AI·CB(t)·DB(t), it obtains with phase I branch
Baseband signal SI(t)。
3. the compound text signal broadcast control method of a kind of R-CSK dual rate according to claim 1, it is characterised in that:
Orthogonal Q branch road, constructs orthogonal Q branch baseband signal as follows:
Firstly, carrying out the bit stream after channel coding is encoded for extension text；
Secondly, being flowed into according to the extension text symbol clock that timing sequencer provides to corresponding bit after extension message coding
Row 1- > KRBit serial/parallel conversion, obtains parallel data stream；Wherein every KR- bit parallel data duration, i.e. symbol time are long
Degree is equal to N times of extension text spreading code cycle time；
Then, the extension text spreading code cycle clock provided according to timing sequencer generates simultaneously line number by Selecting phasing module
According to the corresponding phase pushing figure of stream；
Finally, extension text code cycle clock, Chip clock according to provided by timing sequencer and parallel data stream institute are right
The phase pushing figure answered, and by extension text spectrum-spreading code generator, using default key modulation method, to extension text spreading code
The extension text spreading code that generator generates, which is repeated as many times, carries out code shifting keying modulation, obtains modulated extension text spreading code
SignalAnd combine default extension text power ratio coefficient AQ, pressObtain pseudorandom
Frequency expansion sequence SQ(t), i.e., orthogonal Q branch baseband signal SQ(t), wherein the code phase of pseudorandom spreading sequence is by extension text control
System, (AI)2+(AQ)2=1.
4. the compound text signal broadcast control method of a kind of R-CSK dual rate according to claim 3, it is characterised in that:
The extension text symbol clock is the integral multiple for extending text code cycle clock, and synchronous with extension text code cycle clock.
5. the compound text signal broadcast control method of a kind of R-CSK dual rate according to claim 1, it is characterised in that:
The default key modulation method is BPSK binary phase shift keying carrier modulation or the M-ary orthogonal letter of other congruence properties
Number modulation system.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110244328A (en) * | 2019-05-28 | 2019-09-17 | 西安空间无线电技术研究所 | A kind of navigation enhancing signal modulating method and system |
| CN110275189A (en) * | 2019-05-28 | 2019-09-24 | 西安空间无线电技术研究所 | A kind of the chip time-division navigation signal modulation method and system of mixed information rate |
| CN112020830A (en) * | 2019-12-18 | 2020-12-01 | 航天恒星科技有限公司 | Telegraph text signal broadcasting method and device based on phase discontinuous R-CSK modulation |
| CN112105958A (en) * | 2020-07-03 | 2020-12-18 | 航天恒星科技有限公司 | Bipolar CSK modulation composite telegraph text signal broadcasting method and device |
| CN112230255A (en) * | 2019-06-28 | 2021-01-15 | 千寻位置网络有限公司 | Basic position data broadcasting control method and device and signal generating equipment |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4644560A (en) * | 1982-08-13 | 1987-02-17 | Hazeltine Corporation | Intranetwork code division multiple access communication system |
| CN101753504A (en) * | 2008-12-16 | 2010-06-23 | 华为技术有限公司 | Differential modulation and demodulation method, transmitter and receiver |
| CN101887113A (en) * | 2009-05-13 | 2010-11-17 | 中国科学院国家天文台 | Signal structure integrating navigation and communication |
| CN103067327A (en) * | 2011-10-24 | 2013-04-24 | 华为技术有限公司 | Method of signal transmission and device thereof |
| US20140056333A1 (en) * | 2012-08-27 | 2014-02-27 | Rupert Theodore Neff | Random Non-Cyclical Binary Code Generator |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8035556B2 (en) * | 2009-08-17 | 2011-10-11 | Electronics And Telecommunications Research Institute | Apparatus for transmitting pseudollite signal based on single clock and positioning system using the same |
| EP2745141A1 (en) * | 2011-08-16 | 2014-06-25 | European Space Agency | A navigation system using spreading codes based on pseudo-random noise sequences |
-
2018
- 2018-09-17 CN CN201811078853.1A patent/CN109246041B/en active Active
- 2018-11-01 WO PCT/CN2018/113488 patent/WO2020056871A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4644560A (en) * | 1982-08-13 | 1987-02-17 | Hazeltine Corporation | Intranetwork code division multiple access communication system |
| CN101753504A (en) * | 2008-12-16 | 2010-06-23 | 华为技术有限公司 | Differential modulation and demodulation method, transmitter and receiver |
| CN101887113A (en) * | 2009-05-13 | 2010-11-17 | 中国科学院国家天文台 | Signal structure integrating navigation and communication |
| CN103067327A (en) * | 2011-10-24 | 2013-04-24 | 华为技术有限公司 | Method of signal transmission and device thereof |
| US20140056333A1 (en) * | 2012-08-27 | 2014-02-27 | Rupert Theodore Neff | Random Non-Cyclical Binary Code Generator |
Non-Patent Citations (2)
| Title |
|---|
| A. GARCIA-PENA,C. MACABIAU,C. RODRIGUEZ, D. BROCARD: ""Complementary signal structure proposals for"", 《2014 IEEE/ION POSITION,LOCATION AND NAVIGATION SYMPOSIUM - PLANS 2014》 * |
| 靳舒馨等: ""CSK调制在GNSS系统中的应用"", 《第八届中国卫星导航学术年会论文集——S03卫星导航信号与信号处理》 * |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110244328A (en) * | 2019-05-28 | 2019-09-17 | 西安空间无线电技术研究所 | A kind of navigation enhancing signal modulating method and system |
| CN110275189A (en) * | 2019-05-28 | 2019-09-24 | 西安空间无线电技术研究所 | A kind of the chip time-division navigation signal modulation method and system of mixed information rate |
| CN110244328B (en) * | 2019-05-28 | 2021-03-26 | 西安空间无线电技术研究所 | Navigation enhancement signal modulation method and system |
| CN110275189B (en) * | 2019-05-28 | 2021-11-16 | 西安空间无线电技术研究所 | Method and system for modulating chip time division navigation signal of mixed information rate |
| CN112230255A (en) * | 2019-06-28 | 2021-01-15 | 千寻位置网络有限公司 | Basic position data broadcasting control method and device and signal generating equipment |
| CN112020830A (en) * | 2019-12-18 | 2020-12-01 | 航天恒星科技有限公司 | Telegraph text signal broadcasting method and device based on phase discontinuous R-CSK modulation |
| WO2021120027A1 (en) * | 2019-12-18 | 2021-06-24 | 航天恒星科技有限公司 | Message signal broadcasting method and device employing phase discontinuity r-csk modulation |
| CN112020830B (en) * | 2019-12-18 | 2022-03-04 | 航天恒星科技有限公司 | Telegraph text signal broadcasting method and device based on phase discontinuous R-CSK modulation |
| CN112105958A (en) * | 2020-07-03 | 2020-12-18 | 航天恒星科技有限公司 | Bipolar CSK modulation composite telegraph text signal broadcasting method and device |
| WO2022000442A1 (en) * | 2020-07-03 | 2022-01-06 | 航天恒星科技有限公司 | Bipolar csk modulation-based composite message signal broadcasting method and apparatus |
| CN112105958B (en) * | 2020-07-03 | 2023-09-29 | 航天恒星科技有限公司 | Bipolar CSK modulation composite text signal broadcasting method and device |
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