CN105337634B - Spectrum spread communication method and communicator with DSSS based on 2 Wikis - Google Patents
Spectrum spread communication method and communicator with DSSS based on 2 Wikis Download PDFInfo
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Abstract
The invention provides a kind of spectrum spread communication method and communicator with DSSS based on 2 Wikis, base band transmission part includes first, second two parallel DSSS transmission branches, wherein, the spread spectrum code sequence that second branch road band spectrum modulation uses is the Hilbert transform of spread spectrum code sequence used by tie point band spectrum modulation, or second the shaping function that uses of branch road base band shaping be that the shaping of tie point base band use the Hilbert transform of shaping function, the superimposed rear output of first, second liang of branch road modulated spread spectrum signal；Receiving terminal carries out noiseless demodulation using the method for matched filtering to reception signal.The baseband signal Spatial Dimension of traditional direct sequence spread spectrum communication system can be expanded to 2 by communication means and communicator provided by the invention by 1, its message capacity and transmission rate is set to be changed into original 2 times, potential application field includes military satellite communication, secure radio communication, Beidou satellite navigation communication system etc..
Description
Technical field
The present invention relates to radio communication technology, more particularly it relates to which a kind of expanded based on 2 dimension baseband direct sequences
The spectrum spread communication method and communicator of frequency, belong to technical field of information transmission.
Background technology
One characteristic feature of spread spectrum system is that the bandwidth being transmitted shared by signal energy have to be larger than information bit rate
Corresponding bandwidth (being generally much larger than), and have been generally acknowledged that transmission bandwidth is unrelated with information bit rate, U.S. Publication
Patent " METHOD AND APPARATUS FOR SELECTING A SPREADING CODE IN A SPECTRUM SPREAD
COMMUNICATION SYSTEM " (see U.S.Patent5515396) and Roger L classical works《Introduction to
Spread Spectrum Communications》Etc. all having specifically mentioned this viewpoint in documents and materials.
Resistant DS Spread Spectrum System (DSSS) is a kind of typical spread spectrum communication system, and it is also known as direct sequence modulation system
System or pseudonoise system (PN systems), there is the characteristics of anti-interference, anti-intercepting and capturing, strong ability of anti-multipath, in global positioning satellite, north
The numerous areas such as bucket navigation, satellite communication, military radio communication, survey of deep space are all widely used.DSSS will
The information to be sent expands to a very wide frequency band up with spreading code, in receiving terminal, with transmitting terminal identical spreading code
Relevant treatment is carried out to the spread-spectrum signal received, and then recovers primary data information (pdi).One characteristic feature of the system is
The bandwidth of modulated spread-spectrum signal is unrelated with modulation intelligence bit rate, from the perspective of spectrum utilization, the frequency spectrum of this system
It is extremely inefficient.
It is well known that on the premise of signal transmission bandwidth is not increased, increase signal space dimension can improve information biography
Defeated efficiency；Meanwhile the noiseless demodulation of multi-dimensional modulation signal can be realized using the orthogonal or quasi- orthogonal property between signal.From
The physical layer general principle of direct sequence spread spectrum communication system can be seen that traditional DSSS Transmission system in base band
There is 1 signal dimension, its message capacity and transmission rate are also just restricted.If signal transmission bandwidth can not increased
On the premise of, increase signal space dimension associated with spreading code in direct sequence spread spectrum communication system, it is possible to carry at double
The message capacity and transmission rate of high direct sequence spread spectrum communication system.
The content of the invention
Basic physical layer principle based on Direct Sequence Spread Spectrum Communication, go out from the angle of extension modulated signal Spatial Dimension
Hair, realize that the 2 Wikis band DSSS based on single spreading code transmits, improve the communication of DSSS Transmission system
Capacity and transmission rate.The present invention provides a kind of spectrum spread communication method and communicator with DSSS based on 2 Wikis.
According to an aspect of the present invention, there is provided a kind of based on spectrum spread communication method of 2 Wikis with DSSS：
Emitting portion：Serioparallel exchange pretreatment is carried out to presetting information first, base secondly is carried out to pretreated information
Band digital modulation, then to base-band digital modulated signal carry out DSSS modulation, then to DSSS modulate after
Signal carry out base band shaping, the signal after shaping up-conversion and exported by antenna.
Receiving portion：Modulated signal is received by antenna first, and down coversion is carried out to reception signal；Then docking is collected mail
Number carry out despreading demodulation processing, obtain demodulating information, finally to demodulating information carry out parallel-serial conversion processing.
It is characterized in that：Base band transmission includes first, second two parallel transmission branch roads, wherein, the second branch road spreading code
Sequence is the orthogonal transformation form of tie point spread spectrum code sequence, or the second branch road base band shaping function and tie point base band into
Type function is mutually orthogonal；The first, second branch road spread spectrum code sequence is the modulation of first, second branch road DSSS respectively
The spread spectrum code sequence of use, the first, second branch road base band shaping function are that the shaping of first, second branch road base band uses respectively
Shaping function.
When the second branch road spread spectrum code sequence is the orthogonal transformation form of tie point spread spectrum code sequence, first, second
After the modulation of road DSSS, first branch road modulated spread spectrum signal is overlapped, then pair and signal carry out base band shaping.Enter one
Step, the orthogonal transformation is Hilbert transform；The demodulation of the branch road of receiving portion first, second uses matched filtering demodulation side
Method, the template signal that first, second flow adaptation demodulation by filter uses be respectively first, second branch road spread spectrum code sequence base band into
The waveform signal obtained after type.
When the second branch road spread spectrum code sequence is identical with tie point spread spectrum code sequence, the second branch road base band shaping function with
Tie point base band shaping function is mutually orthogonal；After the shaping of first, second branch road base band, signal is overlapped, then pair and
Signal carries out up-conversion.Further, the second branch road base band shaping function is the Hilbert transform of tie point base band function；Connect
The demodulation of the branch road of receiving portions first, second uses matched filtering demodulation method, and first, second branch road demodulation module matched filtering is adopted
Template signal is respectively that first, second branch road spread spectrum code sequence obtains after the shaping of first, second branch road shaping function
Waveform signal.
According to another aspect of the present invention, there is provided a kind of based on frequency spreading device of 2 Wikis with DSSS, bag
Include transmitter unit and receiving unit：
Transmitter unit, modulated for completing 2 Wikis band DSSS, and modulated signal frequency conversion is launched and exported；Bag
Contain：Information source module, for providing system presetting information；Serioparallel exchange pretreatment module, for being gone here and there to serial presetting information
And change pretreatment；Digital baseband modulation module, digital baseband modulation is carried out for pretreated presetting information；Direct sequence
Band spectrum modulation module, for carrying out DSSS modulation to digital baseband modulation signal；Base band forming module, for logarithm
Word modulated spread spectrum signal carries out base band shaping；Laminating module, for by the synthesis of arm modulation Signal averaging all the way and signal；Upper change
Frequency output module, for carrying out up-conversion to base-band spread-spectrum modulated signal, and the signal after frequency conversion is launched by antenna and exported.
Receiving unit, for receiving modulated signal, and processing is demodulated to reception signal, obtains demodulating information；Comprising：
Down coversion receiving module, for receiving modulated signal by antenna, and down coversion is carried out to reception signal；Demodulation module, it is used for
Reception signal is demodulated, obtains demodulating information；Parallel-serial conversion processing module, turn for carrying out and going here and there to parallel demodulation information
Change processing；Stay of two nights module, receive or store demodulating information.
It is characterized in that：Digital modulation module includes first, second digital modulation module, and DSSS module includes
First, second DSSS module, demodulation module include first, second demodulation module；Second spread spectrum code sequence and first
Spread spectrum code sequence is identical, or the orthogonal transformation form of the first spread spectrum code sequence, and first, second spread spectrum code sequence is respectively
The spread spectrum code sequence that first, second DSSS module uses.
When the second spread spectrum code sequence is the orthogonal transformation form of the first spread spectrum code sequence, laminating module input and
First, the second DSSS module is connected, and output end is connected with base band forming module.Further, the orthogonal transformation
For Hilbert transform, first, second demodulation module uses matched filtering demodulation technology, the filtering of first, second mode transfer Block- matching
The template signal of use is respectively the waveform signal obtained after first, second spread spectrum code sequence base band is molded.
When the second spread spectrum code sequence is identical with the first spread spectrum code sequence, base band forming module further comprising first, the
Two base band forming modules, laminating module input is connected with first, second base band forming module, the output of output end and up-conversion
Module is connected, and the first shaping function and the second shaping function are mutually orthogonal, and first, second shaping function is respectively
First, the shaping function that the second base band forming module uses.Further, the second shaping function is the Hilbert of the first base band function
Conversion, first, second demodulation module use matched filtering demodulation technology, the template that the filtering of first, second mode transfer Block- matching uses
Signal is respectively the waveform signal that spread spectrum code sequence obtains after the shaping of first, second shaping function.
Brief description of the drawings
The specific embodiment of the invention and embodiment are described further referring to the drawings, wherein：
Fig. 1 is based on spread spectrum communication system transmitter unit Structure and Process of 2 Wikis with DSSS.
Fig. 2 is based on spread spectrum communication system receiving unit Structure and Process of 2 Wikis with DSSS.
Fig. 3 is base band shaping function h (t) normalization time domain response.
Fig. 4 is base band shaping function h (t) Hilbert transformNormalization time domain response waveform.
Fig. 5 is system error performance simulation curve.
As illustrated, in order to more clearly state embodiments of the invention structure, be labelled with figure specific structure and
Module, it is only for illustrating needs, is not intended to limit the invention in the specific structure, module or environment, according to specific need
Want one of ordinary skill in the art these devices and module can be adjusted or changed, the adjustment that is carried out or repair
Change and be still included in appended claims scope.
Embodiment
In the following description, multiple different aspects of the present invention will be described, however, for ordinary skill in the art
For personnel, the present invention can be implemented merely with part or all of structure or flow of the present invention.For the definition of explanation,
Specific number, configuration and order are elaborated, however, it will be apparent that this can also be implemented in the case of these no specific details
Invention.Due to the particular technique that uses of the present invention be basic fundamental well known within the skill of those ordinarily skilled (such as serioparallel exchange,
DSSS, Hilbert transform, matched filtering demodulation etc.), in order to not obscure the present invention, for numerous known features
To no longer it be described in detail.
(1) based on spectrum spread communication method specific implementation step of 2 Wikis with DSSS：
According to an aspect of the present invention, there is provided a kind of based on spectrum spread communication method of 2 Wikis with DSSS, figure
1st, Fig. 2 is spread spectrum communication system transmitter unit and receiving unit structure flow chart based on 2 Wiki bands directly series spread spectrum respectively.
It can be seen that this method implementation steps include：Presetting information serioparallel exchange, the modulation of first, second digital baseband with it is straight
Connect sequence spread spectrum, the shaping of first, second branch road numeral modulated spread spectrum signal base band, superposition, up-conversion output；Reception down coversion,
The demodulation of first, second branch road, parallel-serial conversion.
Specifically, the specific implementation step based on spectrum spread communication method of 2 Wikis with DSSS is：
1. serioparallel exchange.The serial presetting information provided according to information source module, serioparallel exchange is carried out to presetting information and obtained
ai、biI=0,1,2 ... two-way presetting information parallel, might as well be by a for the ease of illustratingiBranch road is referred to as tie point, biBranch road
Referred to as the second branch road is pre-, ai、biThe presetting information of first, second branch road is represented respectively.
2. digital baseband is modulated.The specific digital baseband modulation system used according to system, respectively to ai、biCarry out numeral
Baseband modulation, obtain first, second branch road numeral baseband modulation signal a (t), b (t).
3. DSSS is modulated.It is utilized respectively the spread spectrum code sequence that length is KI=1,2 ..., K, to
First, the second branch road numeral baseband modulation signal carries out DSSS modulation, obtains first, second branch road numeral base-band spread-spectrum
Modulated signal ac(t)、bc(t)。
4. base band is molded.It is utilized respectively base band shaping function h1(t)、h2(t), to first, second branch road numeral base-band spread-spectrum
Modulated signal ac(t)、bc(t) base band shaping is carried out, obtains first, second branch road base-band spread-spectrum modulated signal sa(t)、sb(t)。
5. time domain is superimposed.First, second tributary signal obtained to back carries out time domain superposition, obtains all the way and believes
Number.
6. up-conversion transmitting output.After being molded to base band and signal carries out up-conversion, and the signal after frequency conversion is passed through
Antenna exports.
7. down coversion receives.Modulated signal is received by antenna, and down coversion is carried out to it, obtain reception signal r (t)=
S (t)+n (t), n (t) represent noise jamming.
8. demodulate.According to the digital baseband modulation system of transmitting terminal, spread spectrum code sequence is utilized respectivelyI=1,
2 ..., K, and base band shaping function h1(t)、h2(t), reception signal r (t) is demodulated, obtains the demodulation of first, second branch road
Information a 'i、b′i。
9. parallel-serial conversion.To first, second branch road parallel demodulation information a 'iWith b 'iParallel-serial conversion is carried out, is obtained final
Demodulating information.
Communication means is characterised by, in base band simultaneous transmission two-way modulated spread spectrum signal, need to meet following two conditions
In a condition：
Condition 1)：Step 3. in, the second branch road band spectrum modulation use spread spectrum code sequenceI=1,2 ..., K is first
Branch road band spectrum modulation uses spread spectrum code sequenceI=1,2 ..., K orthogonal transformation form；
Condition 2)：Step 4. in, the second base band shaping use shaping function h2(t) with the first base band shaping use into
Type function h1(t) it is mutually orthogonal.
Meet condition 1) in the case of：
When first, second base band shaping function is identical, i.e. h1(t)=h2(t) when, the code after base band shaping can also be ensured
First modulated spread spectrum signal is mutually orthogonal, i.e.,：
In formula, TsRepresent code-element period, TgRepresent the symbol expansion time after base band shaping.
When first, second base band shaping function difference, can be obtained by the autocorrelation performance of spread spectrum code sequence：
Meet condition 2) in the case of：
First, second base-band spread-spectrum code sequence is identical or the second base-band spread-spectrum code sequence is the first base-band spread-spectrum code sequence
During orthogonal transformation form, according to orthogonal function and the autocorrelation performance of spread spectrum code sequence, it can obtain：
Further, symbol time extension T caused by base band shaping is consideredgCause the intersymbol interference of front and rear symbol between branch road
Problem, because the spreading factor K (namely spread code length) of Direct Sequence Spread Spectrum Communication is generally larger, (tens, hundreds of even
It is thousands of), and above-mentioned intersymbol interference be band spectrum modulation chip carry out base band shaping when it is caused, its value relative to whole symbol energy
It can almost ignore for amount.
It can make at two branch road band spectrum modulation symbols in the case where meeting described either condition it can be seen from analysis more than
In quasi-orthogonal state, and ensure the necessary condition of system transmission performance.
It is well known that Hilbert transform is a kind of orthogonal transformation, carrying out Hilbert transform to discrete series can obtain
To another discrete series, another continuous function can be obtained by carrying out Hilbert transform to continuous function.This characteristic is used
Into the present invention, both can obtain and tie point spread spectrum code sequenceI=1,2 ..., Hilbert transform sequence mutually orthogonal K
RowIt can obtain and tie point base band shaping function h again1(t) mutually orthogonal shaping function h2(t).Hilbert transform
Natural characteristic can bring the transmission performance of near ideal to system.Especially, raised cosine shaping function and its Hilbert become
The time domain waveform difference changed is as shown in Figure 3, Figure 4.
A kind of modulation system often has a variety of demodulation methods, when two paths of signals meets orthogonal or quasi- orthogonal property, matching
Filtering is a kind of simple, efficient demodulation method, and one of wide variety of demodulation method in communication system.Based on the present invention
The fundamental characteristics of modulated signal, the method that matched filtering demodulation can be used.
Specifically, step 8. in, using the demodulation method of matched filtering, template that the first demodulation flow adaptation filtering uses
Signal is spread spectrum code sequenceI=1,2 ..., K is through shaping function h1(t) waveform signal after being molded, the second demodulation flow adaptation
The template signal used is filtered as spread spectrum code sequenceI=1,2 ..., K is through shaping function h2(t) waveform signal after being molded.
It should be noted that considering the complexity issue that system is realized, meeting condition 1) in the case of, first, second
Base band shaping function h1(t)、h2(t) it is identical, now 4. 5. step can sequentially be exchanged with step, and by step 4. in first,
A base band shaping is merged into 2 two base band shapings, and base-band spread-spectrum modulated signal is obtained after shaping.
(2) based on frequency spreading device specific implementation step of 2 Wikis with DSSS
According to another aspect of the present invention, there is provided a kind of based on frequency spreading device of 2 Wikis with DSSS.Hair
Penetrate unit and include information source module, serioparallel exchange module, digital baseband modulation module (comprising first, second digital baseband modulation mould
Block), DSSS modulation module (including first, second DSSS modulation module), base band forming module, superposition
Module, up-conversion transmitter module；Receiving unit, which includes, receives down conversion module, demodulation module (comprising first, second solution mode transfer
Block), parallel serial conversion module and stay of two nights module.The spread spectrum communication system of Fig. 1, Fig. 2 based on 2 Wiki bands directly series spread spectrum is launched single
Member and receiving unit Structure and Process.
Wherein, transmitter unit is used to complete the band DSSS modulation of 2 Wikis, and modulated signal frequency conversion transmitting is defeated
Go out；Comprising：Information source module, for providing system presetting information；Serioparallel exchange module, it is serial for being carried out to serial presetting information
Conversion, obtains tie point and the second branch road two-way presetting information parallel；Digital baseband modulation module, include first, second number
Word baseband-modem module, it is respectively used to carry out digital baseband modulation to the presetting information of first, second branch road, obtains first, second
Branch road numeral baseband modulation signal；DSSS modulation module, comprising first, second DSSS modulation module,
It is respectively used to carry out DSSS modulation to digital baseband modulation signal, obtains first, second branch road digital spread-spectrum modulation
Signal；Base band forming module, for carrying out base band shaping to digital modulated spread spectrum signal；Laminating module, for by first, second
Branch road base-band spread-spectrum modulated signal is superimposed, and is obtained all the way and signal；Up-conversion transmitter module, after to base band shaping superposition
Signal carries out up-conversion, and the signal after frequency conversion is launched by antenna and exported.
Receiving unit is used to receive modulated signal, and processing is demodulated to reception signal, obtains demodulating information；Comprising：
Down coversion receiving module, for receiving modulated signal by antenna, and down coversion is carried out to reception signal；Demodulation module, comprising
First, second branch road demodulation module, it is respectively used to demodulate first, second arm modulation information, obtains the demodulation of first, second branch road
Information；Parallel serial conversion module, for carrying out parallel-serial conversion to first, second branch road demodulating information, obtain identical with transmitter unit
Serial data stream form；Stay of two nights module, receive or store demodulating information.
The specific implementation of the frequency spreading device transmitter unit with DSSS provided by the invention based on 2 Wikis
Journey is as follows：
1. serioparallel exchange.Based on serioparallel exchange pretreatment module, the serial presetting information provided according to information source module, to pre-
Adjust information to carry out serioparallel exchange and obtain ai、biI=0,1,2 ... two-way presetting information parallel, might as well be by a for the ease of illustratingi
Branch road is referred to as tie point, biIt is pre- that branch road is referred to as the second branch road, ai、biThe presetting information of first, second branch road is represented respectively.
2. digital baseband is modulated.Based on first, second digital baseband modulation module, the specific digital base used according to system
Band modulation system, respectively to ai、biDigital baseband modulation is carried out, obtains first, second branch road numeral baseband modulation signal a (t), b
(t)。
3. DSSS is modulated.Based on first, second DSSS modulation module, it is K to be utilized respectively length
Spread spectrum code sequenceI=1,2 ..., K, direct sequence expansion is carried out to first, second branch road numeral baseband modulation signal
Frequency modulation system, obtain first, second branch road numeral base-band spread-spectrum modulated signal ac(t)、bc(t)。
4. base band is molded.Based on base band forming module, base band shaping function h is utilized respectively1(t)、h2(t), to first,
Two branch road numeral base-band spread-spectrum modulated signal ac(t)、bc(t) base band shaping is carried out, obtains first, second branch road base-band spread-spectrum tune
Signal s processeda(t)、sb(t)。
5. time domain is superimposed.Based on time domain laminating module, first, second tributary signal obtained to back carries out time domain and folded
Add, obtain all the way and signal.
6. up-conversion transmitting output.Based on up-conversion output module, up-conversion is carried out to base-band spread-spectrum modulated signal s (t),
And the signal after frequency conversion is exported by antenna.
Frequency spreading device receiving unit specific work process provided by the invention based on 2 Wikis with DSSS
It is as follows：
1. down coversion receives.Based on down coversion receiving module, modulated signal is received by antenna, and lower change is carried out to it
Frequently, obtain reception signal r (t)=s (t)+n (t), n (t) and represent noise jamming.
2. demodulate.It is sharp respectively according to the digital baseband modulation system of transmitting terminal based on first, second branch road demodulation module
Use spread spectrum code sequenceI=1,2 ..., K, and base band shaping function h1(t)、h2(t), reception signal r (t) is solved
Adjust, obtain first, second branch road demodulating information a 'i、b′i。
3. parallel-serial conversion.Based on parallel serial conversion module, to first, second branch road parallel demodulation information a 'iWith b 'iCarry out simultaneously
String conversion, obtains final demodulating information.
It is characterised by that a bar in following two conditions in base band simultaneous transmission two-way modulated spread spectrum signal, need to be met
Part：
Condition 1)：In the transmitter unit course of work 3, the spread spectrum code sequence of the second branch road band spectrum modulation useI=1,
2 ..., K is that tie point band spectrum modulation uses spread spectrum code sequenceI=1,2 ..., K orthogonal transformation form；
Condition 2)：In the transmitter unit course of work 4, the shaping function h of the second base band shaping use2(t) with the first base band
It is molded the shaping function h used1(t) it is mutually orthogonal.
Above-mentioned two condition can ensure that two branch road band spectrum modulation symbols are in quasi-orthogonal state, and ensure system transmission
The premise of performance.
Further, using the processing means of Hilbert transform, condition 1 is made) in, the modulation of the second branch road DSSS
The spread spectrum code sequence of useI=1,2 ..., K is that the modulation of tie point DSSS uses spread spectrum code sequenceI=1,
2 ..., K Hilbert transform；Make condition 2) in, the shaping function h of the second base band shaping use2(t) be the first base band into
Type uses shaping function h1(t) Hilbert transform.
Further, the branch road demodulation module of receiving terminal first, second uses matched filtering demodulation detection technique, the first solution
The template signal that the filtering of mode transfer Block- matching uses is spread spectrum code sequenceI=1,2 ..., K is through shaping function h1(t) after being molded
Waveform signal, the template signal that the second demodulation module matched filtering uses is spread spectrum code sequenceI=1,2 ..., K is through being molded letter
Number h2(t) waveform signal after being molded.
It should be noted that in order that the structure of communicator is as simple as possible, meeting condition 1) in the case of,
First, the second branch road base band forming module use shaping function it is identical, now can by implementation steps 4. with implementation steps 5. order
Exchange, and by step 4. in first, second two base band forming modules merge into a base band forming module, obtained after shaping
Base-band spread-spectrum modulated signal.
Embodiment：
In order to more preferably illustrate the implementation steps of the present invention, while show the good characteristic of the present invention, below in conjunction with accompanying drawing pair
Communication system provided by the present invention is described further.Obviously, described embodiment is only that the part of the present invention is real
Apply example, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creativeness
The every other embodiment obtained under the premise of work, belongs to the scope of protection of the invention.
According to the implementation steps based on spectrum spread communication method of 2 Wikis with DSSS and communicator, set logical
Believe that systematic parameter is as follows：
Spread spectrum code sequence：M-sequence；
Digital baseband modulation system：Binary pulse amplitude modulation(PAM) (BPAM)；
DSSS modulation system：127 DSSSs modulate (primitive polynomial x7+x3+1)；
Base band shaping function：Raised cosine filter is molded (forming coefficients：0.25, over-sampling rate：8)；
Channel condition：Additive white Gaussian noise channel (AWGN)；
Demodulation mode：Matched filtering demodulation；
Transmission conditions：First, second branch road spread spectrum code sequence it is identical (I=1,2 ..., 127), second roadbed
With the Hilbert transform (h that shaping function is tie point shaping function2(t)=Hilbert { h1(t) }, Hilbert { } table
Show Hilbert transform operator)；
Information source：Pseudorandom information source；
Transmit information content：2×107bit。
Specific implementation step is as follows：
1. serioparallel exchange.The presetting information of serial pseudorandom is converted into first, second two branch roads presetting information parallel.
2. binary pulse amplitude modulation(PAM).BPAM modulation is carried out to the presetting information of first, second branch road respectively, obtains the
First, the second branch road numeral baseband modulation signal.
3. DSSS is modulated.Using the m-sequence that length is 127, first, second branch road digital baseband is adjusted respectively
Signal processed carries out DSSS modulation, obtains first, second branch road numeral base-band spread-spectrum modulated signal.
4. base band is molded.Raised cosine filter shaping function and its Hilbert transform are utilized respectively, to first, second branch road
Digital baseband modulated spread spectrum signal carries out base band shaping, obtains first, second branch road base-band spread-spectrum modulated signal.
5. it is superimposed.The first, second branch road base-band spread-spectrum modulated signal for being molded to obtain to base band carries out time domain superposition, obtains
Base band and signal all the way.
6. up-conversion transmitting output.Up-conversion is carried out to base band and signal, and the signal after frequency conversion is exported by antenna.
Made an uproar 7. channel adds.White Gaussian noise is added to transmission signal.
7. down coversion receives.Modulated signal is received by antenna, and down coversion is carried out to it, obtains reception signal.
8. demodulate.Waveform of the m-sequence after raised cosine filter shaping function and its Hilbert transform shaping is respectively adopted
Signal carries out first, second flow adaptation demodulation by filter to reception signal, obtains first, second branch road solution as template signal
Adjust information.
9. parallel-serial conversion.Parallel-serial conversion is carried out to first, second branch road parallel demodulation information, obtains final demodulation letter
Breath.
Fig. 4 is ber curve figure of the system obtained by Bit Error Code Statistics under the conditions of Gaussian white noise channel.From by mistake
As can be seen that the statistics bit error rate is almost completely the same with the theoretical bit error rate of BPAM modulation in code check result.With it is traditional direct
Sequence spread spectrum system is compared, and spectrum spread communication method and communicator provided by the invention be not in not spread spectrum communication bandwidth, drop
On the premise of low transmission performance, transmission rate is doubled, this result presentation offer communication means of the invention and logical
The superiority of T unit.
Beneficial effect：
Generally, for direct sequence spread spectrum communication system provided by the invention and communication means, with prior art phase
Than having the advantages that：
1. message capacity is big, transmission rate is high.
Compared with traditional DSSS modulator approach, passed not extending system transmission bandwidth, not reducing system
On the premise of defeated performance, the signal space dimension of baseband direct sequence spread spectrum communication is brought up to 2 by the present invention by 1, makes direct sequence
The message capacity and transmission rate of row band spectrum modulation system greatly improve, and can reach original twice.
2. Project Realization is simple, hardware cost is low.
Communication means provided by the invention is obtained on the basis of existing, ripe signal of communication processing method,
It is not related to the algorithm of complexity, under existing hardware technology level, directly can be realized by integrated chip, to hardware performance
There is no special requirement, there is the characteristics of Project Realization is simple, hardware cost is low.
3. have a wide range of application.
Communication system provided by the invention and communication means have important application value and realistic meaning, can directly apply
In the upgrading of existing direct sequence spread spectrum communication system and the development of direct sequence spread spectrum communication system of future generation.Potentially
Application field also includes：Military satellite communication, radio security communication, Beidou satellite navigation, mobile CDMA communication etc..
It is last it should be noted that above embodiment and embodiment be intended to illustrate the technical scheme of invention without
It is the limitation to technical method, the present invention can above extend to other modifications, change, application and embodiment in application, and
It is taken as that all such modification, conversion, application and embodiments are all within the scope of the spirit or teaching of the present invention.
Claims (6)
1. it is a kind of based on spectrum spread communication method of 2 Wikis with DSSS,
Emitting portion：Presetting information is pre-processed first, base-band digital modulation secondly is carried out to presetting information, then to base
Band digital modulation signals carry out DSSS modulation, then carry out base band shaping to the signal after DSSS modulation,
Signal after shaping is subjected to up-conversion and exported by antenna；
Receiving portion：Modulated signal is received by antenna first, and down coversion is carried out to reception signal；Then reception signal is entered
Row despreading demodulation processing, obtains demodulating information；
It is characterized in that：Base band transmission includes first, second two parallel transmission branch roads, wherein, the second branch road spread spectrum code sequence
Identical with tie point spread spectrum code sequence, the second branch road base band shaping function and tie point base band shaping function are mutually orthogonal,
Then pair after the shaping of first, second branch road base band, two tributary signals are overlapped, and signal carries out up-conversion.
2. communication means according to claim 1, it is characterised in that the second branch road base band shaping function is tie point base
The Hilbert transform of tape function.
3. communication means according to claim 1, it is characterised in that the demodulation of first, second branch road uses matched filtering
Demodulation method, the template signal that first, second branch road demodulation module matched filtering uses is respectively first, second branch road spreading code
The waveform signal that sequence obtains after the shaping of first, second shaping function.
It is 4. a kind of based on frequency spreading device of 2 Wikis with DSSS, including information source module, serioparallel exchange pretreatment mould
Block, digital modulation module, DSSS module, base band forming module, laminating module, up-conversion output module, down coversion
Receiving module, demodulation module, parallel-serial conversion processing module, stay of two nights module；Wherein, digital modulation module includes first, second number
Word modulation module, DSSS module include first, second DSSS module, and base band forming module includes the
First, the second base band forming module, demodulation module include first, second demodulation module；
It is characterized in that：The frequency code sequence that first, second DSSS module uses is identical, the shaping of first, second base band
The shaping function that module uses is mutually orthogonal, and laminating module input is connected with first, second base band forming module, output end
It is connected with up-conversion output module.
5. communicator according to claim 4, it is characterised in that the second base band forming module use shaping function be
First base band forming module uses the Hilbert transform of shaping function.
6. communicator according to claim 4, it is characterised in that first, second demodulation module uses matched filtering solution
Conditioning technology, the template signal that the filtering of first, second mode transfer Block- matching uses are respectively spread spectrum code sequence through first, second shaping letter
The waveform signal obtained after number shaping, first, second shaping function is that first, second base band forming module uses respectively
Shaping function.
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| CN1688119A (en) * | 2005-04-01 | 2005-10-26 | 清华大学 | Method for testing DS. CDMA system multi-user developed based on weighting |
| CN1968029A (en) * | 2005-11-16 | 2007-05-23 | 弥亚微电子（上海）有限公司 | Spread-spectrum modulation and demodulation method by special spread spectrum sequence and device |
| CN102710281A (en) * | 2012-06-18 | 2012-10-03 | 中国电子科技集团公司第十研究所 | Direct sequence spread spectrum method for continuous phase modulation |
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| CN1251435C (en) * | 2003-01-16 | 2006-04-12 | 智邦科技股份有限公司 | Method of generating bidimensional orthogonal variable spread spectrum coefficient code in multi-carrier wave direct sequency CDMA cemmunication system |
| US9077442B2 (en) * | 2012-07-16 | 2015-07-07 | Texas Instruments Incorporated | DSSS inverted spreading for smart utility networks |
| CN103152074B (en) * | 2013-02-17 | 2015-08-12 | 哈尔滨工程大学 | A kind of direct sequence spread spectrum communication system launching and receiving method |
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| CN1688119A (en) * | 2005-04-01 | 2005-10-26 | 清华大学 | Method for testing DS. CDMA system multi-user developed based on weighting |
| CN1968029A (en) * | 2005-11-16 | 2007-05-23 | 弥亚微电子（上海）有限公司 | Spread-spectrum modulation and demodulation method by special spread spectrum sequence and device |
| CN102710281A (en) * | 2012-06-18 | 2012-10-03 | 中国电子科技集团公司第十研究所 | Direct sequence spread spectrum method for continuous phase modulation |
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