CN105680902B - A kind of method and system of information signal spread spectrum and despreading - Google Patents
A kind of method and system of information signal spread spectrum and despreading Download PDFInfo
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- CN105680902B CN105680902B CN201610050638.5A CN201610050638A CN105680902B CN 105680902 B CN105680902 B CN 105680902B CN 201610050638 A CN201610050638 A CN 201610050638A CN 105680902 B CN105680902 B CN 105680902B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- 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
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- 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
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
- H04B1/7075—Synchronisation aspects with code phase acquisition
Abstract
The present invention provides a kind of method and system of information signal spread spectrum and despreading, by the way that when base station is communicated with mobile terminal foundation, base station is that mobile terminal distributes initial bits serial number and mode code, and the initial bits serial number and mode code are sent to mobile terminal；Base station is started simultaneously at mobile terminal with identical rate-adaptive pacemaker cycle P N sequences；And in communication process, cycle P N sequences are obtained according to the mode code of distribution used in communicating each time, since PN sequences are variations in communication process each time, compared with constant with PN sequences in the prior art, criminal can be effectively prevent to decode and monitor communication process, improve the confidentiality of communication process.
Description
Technical field
The present invention relates to mobile communication field more particularly to a kind of information signal spread spectrum and the method de-spread and it is
System.
Background technology
Since low frequency signal is not suitable for long-distance communications in the air, there is modulation and demodulation in mobile communication process
Concept, analogy is carried out with mobile communication and traditional post the letter, modulation is exactly the side of posting a letter（Sender）It will letter（Information, by a string 0
With the sequence of 1 composition）Mounted in envelope（Carrier wave）In process, then send（Launched by antenna）, demodulation is exactly to collect mail
Side（Recipient）Envelope is opened after the collection of letters（It dials and removes carrier wave）Obtain letter content（Information transmitted by sender）Process.Above-mentioned
In discussion, it will be assumed that communicating pair is to determine in the given carrier frequency in given area, that is to say, that the carrier frequency
Rate is exclusively enjoyed by communicating pair.But due to frequency resource be it is limited, when given area number of users is saturated, by nothing
Method provides more carrier frequencies for the communicating pair newly increased, in order to alleviate the problem, just produces spread spectrum communication.
Spread spectrum irons a upper address to modulated signal again similar to above-mentioned, and all communicating pairs are using identical
Carrier frequency, the used address of each communication is all different, therefore is communicated with frequency to distinguish different from above-mentioned, spread spectrum
Communication is communicated with address to distinguish, to solve the problems, such as that frequency resource is limited.
The basic principle of spread spectrum communication is as follows：The high frequency being made of 0 and 1 by a string inside base station and mobile terminal follows
Ring high speed（Output speed is far above the rate for the information for needing to transmit, and for example speech digit bit strearm rate is for 64kbps
64000 bits per seconds, and PN sequence output speeds are 400kbps）The Serial No. of output（Call PN sequences, Pseudo in the following text
Noise sequences）, when mobile terminal uses voice service, base station one PN sequence initial bits of distribution give the mobile terminal, from
This, mobile terminal and the data transmission procedure that base station is established are as follows：
By taking mobile terminal is sent to base station signal as an example, the speech digit sequence that mobile terminal first sends needs expands
Frequently, that is, by speech digit sequence with the PN sequences started with the initial bits that base station is distributed carry out with or（Iron one
Address）, then re-modulation to carrier wave（It is packed into envelope）In launched by antenna；It is first demodulated when base station receives signal
（Open envelope）, then only there are one given PN sequences could be carried out with the signal after demodulation with or, can just make with or after
Signal becomes low frequency signal；Serial number of the initial bits of one given PN sequence in entire PN sequences（Sender
The address ironed）It is known that the signal is why transmitted by platform mobile terminal；Certain base station may just be more shiftings simultaneously
Dynamic terminal is serviced, then by the PN sequences of each mobile terminal（Super beginning code is different）The signal for coming with or being received respectively, until
Find a given PN sequence with or after become low frequency signal until.
In communication process, a base station may be communicated with more mobile terminals simultaneously, and base station is mobile whole with every
Using different PN sequences when the communication of end, but actually every mobile terminal uses the same PN sequences（It is certainly
The continuous repetition of body）, every mobile terminal uses a PN sequence, but they are started with different initial bits, accurately
Say started with the bit of different serial number in PN sequences, for example PN sequences are 101100110101110011, from first
Output is started the cycle over as one with the PN sequences with base station and First communication of mobile terminal, output is started the cycle over from second
For one with the PN sequences with base station and second communication of mobile terminal, it is a use and base to start the cycle over output from third position
It stands and the PN sequences of third platform communication of mobile terminal.Therefore, in spread spectrum communication, only there are one PN sequences that are long, constantly recycling
Row, all base stations and mobile terminal all use it, and only difference is that position of the initial bits in PN sequences is different, every
When primary call is established, it is that mobile terminal distributes an initial bits by base station, then reports to mobile terminal.
Same base station sends a signal to a specific mobile terminal, and will will need the signal sent with or it is given
It is retransmited away after PN sequences, its PN sequence is then first carried out same goods by mobile terminal when receiving signal, if can be obtained with after goods
The signal of low frequency then illustrates that the signal is destined to oneself, and otherwise the signal is not destined to being abandoned for oneself.
It is cited a plain example below to illustrate the process of spread spectrum and despreading in the prior art；
Spread spectrum：Low-frequency digital signal as shown in Figure 1（Information）110, with PN sequences with or after be expanded sequence, then will
Sequence spreading is sent；In Fig. 1, the rate of the output code of PN sequences is 6 times of low-frequency digital signal；
Despreading：As shown in Figure 2 after receiving extension signal with given PN sequences it is same or after obtain the original signal of low frequency
（Information）110；When receiving other people signal, with given PN sequences with or after still be high-frequency signal, as shown in figure 3,
Even if only difference its with PN sequences with or it is rear be just high-frequency signal, that is to say, that any desired signal de-spreads it
It is low frequency signal afterwards, it is still that high-frequency signal is abandoned by us that any undesired signal is final after being de-spread to it.
However after call is established, PN sequences determine, criminal can be by acting the signal received with different
Beginning bit tests received signal, as long as air time long enough, so that it may to obtain PN sequences used in call spread spectrum
The initial bits of row monitor the call, then the information in communicating contained in information signal can be revealed.
Therefore, the prior art is up for further improving.
Invention content
In view of above-mentioned shortcoming in the prior art, it is an object of the invention to provide a kind of information signal expansion to the user
The method and system of frequency and despreading, when overcoming base station in the prior art with more communication of mobile terminal, in spread spectrum communication only
Signal transmission is carried out to use the same PN sequences constantly to recycle, the communication information is easy to the security risk being stolen.
The technical proposal for solving the technical problem of the invention is as follows：
A kind of method of information signal spread spectrum communication and despread communications, wherein including：
A, base station is that mobile terminal distributes initial bits serial number and mode code, and by the initial bits serial number and mode code
It is sent to mobile terminal；The mode code is corresponding with the mathematical operation mode carried out to standard PN sequences；
B, base station and mathematical operation mode of the mobile terminal corresponding to the mode code are by pre-stored mark
Quasi- PN is Sequence Transformed at basic PN sequences, and according to the initial bits serial number and basis PN sequences, obtains cycle P N sequences；
C, when mobile terminal or base station send information, by the low frequency digital sequence of information to be transmitted and cycle P N sequences
Corresponding digital number carries out same or operation, and be expanded sequence, and will be sent after sequence spreading modulation；
D, base station or mobile terminal receive the sequence spreading sent from other side, by the sequence spreading received and
The corresponding digital number of cycle P N sequences carry out with or operation after, obtain sequence to be sentenced, and sequence to be sentenced described in judging whether
For high frequency series；If so, abandoning, otherwise, it is determined that the sequence to be sentenced is the information signal that communication counterpart is sent.
Described information signal spread-spectrum communicates and the method for despread communications, wherein further includes before the step A：
A01, the standard PN sequences transmitted for information signal are prestored in base station and mobile terminal.
Described information signal spread-spectrum communicates and the method for despread communications, wherein further includes before the step A：
A02, multiple mode codes are prestored in base station and mobile terminal, the mode code is carried out with to standard PN sequences
Mathematical operation mode correspond.
Described information signal spread-spectrum communicates and the method for despread communications, wherein in the step A, base station is mobile whole
Hold the mode code of distribution corresponding with the number of communications of base station and mobile terminal cycle, and this sub-distribution is arranged in last distribution mould
The mode code of the latter position of formula code.
A kind of system of information signal spread spectrum communication and despread communications, wherein including：Base station and mobile terminal；
The base station includes：Serial number is sent out with mode code distribution module, base station cyclic sequence generation module, base station signal modulation
Send module and base station sequence judgment module；
The serial number and mode code distribution module are that mobile terminal distributes initial bits serial number and mode code for base station,
And the initial bits serial number and mode code are sent to mobile terminal；The mode code and the mathematics that standard PN sequences are carried out
Operation mode is corresponding；
The base station cyclic sequence generation module, will be advance for the mathematical operation mode corresponding to the mode code
The standard PN of storage is Sequence Transformed at basic PN sequences, and according to the initial bits serial number and basis PN sequences, is recycled
PN sequences；
The base station signal modulation and transmission module is delivered letters for base station or mobile terminal when sending information by be passed
The low frequency digital sequence digital number corresponding with cycle P N sequences of breath carries out same or operation, and be expanded sequence, and will be described
It is sent after sequence spreading modulation；
The base station sequence judgment module, for receiving the sequence spreading, by the sequence spreading received and cycle P N
After the corresponding digital number of sequence carries out same or operation, sequence to be sentenced is obtained, and whether sequence to be sentenced described in judgement is high frequency
Sequence；If so, abandoning, otherwise, it is determined that the sequence to be sentenced is the information signal that communication counterpart is sent；
The mobile terminal includes：Terminal cyclic sequence generation module, terminal signaling modulation and transmission module and terminal serial
Judgment module；
The terminal cyclic sequence generation module, initial bits serial number and mode code for receiving base station distribution, according to
Mathematical operation mode corresponding to the mode code is Sequence Transformed at basic PN sequences by pre-stored standard PN, and according to institute
Initial bits serial number and basis PN sequences are stated, cycle P N sequences are obtained；
The terminal signaling modulation and transmission module is used for when mobile terminal sends information, by the low frequency of information to be transmitted
Corresponding with the cycle P N sequences digital number of Serial No. carry out with or operation, be expanded sequence, and by the sequence spreading
It is sent after modulation；
The terminal serial judgment module, the sequence spreading sent out for receiving base station, the extension sequence that will be received
After row digital number corresponding with cycle P N sequences carries out same or operation, sequence to be sentenced, and sequence to be sentenced described in judgement are obtained
Whether it is high frequency series；If so, abandoning, otherwise, it is determined that the sequence to be sentenced is the information signal that communication counterpart is sent.
Described information signal spread-spectrum communicates and the system of despread communications, wherein the base station further includes：Base station first is advance
Memory module；The mobile terminal further includes：Terminal first prestores module；
The base station first prestores module, for prestoring the standard PN transmitted for information signal in a base station
Sequence；
The terminal first prestores module, for the standard PN sequences in mobile terminal storage for information signal transmission
Row.
Described information signal spread-spectrum communicates and the system of despread communications, wherein the base station further includes：Base station second is advance
Memory module；The mobile terminal further includes：Terminal second prestores module；
The base station second prestores module, for prestoring multiple mode codes in a base station；
The terminal second prestores module, for prestoring multiple mode codes in the terminal；The pattern
Code is corresponded with the mathematical operation mode carried out to standard PN sequences.
Described information signal spread-spectrum communicates and the system of despread communications, wherein the serial number and mode code distribution module are also
Including：Base station is corresponding with the number of communications of base station and mobile terminal cycle for the mode code of mobile terminal distribution, and this sub-distribution
It is arranged in the mode code of the last latter position of allocation model code.
Advantageous effect, the present invention provides a kind of information signal spread spectrum and despreading method and system, by base station with
When mobile terminal establishes communication, base station is that mobile terminal distributes initial bits serial number and mode code, and by the initial bits sequence
Number and mode code be sent to mobile terminal；Base station is started simultaneously at mobile terminal with identical rate-adaptive pacemaker cycle P N sequences；And
In communication process, communicating used cycle P N sequences each time is obtained according to the mode code of distribution, due to each
In secondary communication process PN sequences be variation, it is constant with PN sequences in the prior art compared with, criminal can be effectively prevent
Communication process is decoded and is monitored, the confidentiality of communication process is improved.
Description of the drawings
Fig. 1 is the principle schematic spread in the prior art to information signal.
Fig. 2 is the principle schematic for carrying out solution frequency to information signal in the prior art.
Fig. 3 is the step flow chart of the method for a kind of information signal spread spectrum of the present invention and despreading.
Fig. 4 is the schematic diagram of the cyclic sequence of method Application Example of the present invention.
Fig. 5 is the schematic diagram that PN sequences are extended in the method for the invention Application Example.
Fig. 6 is the theory structure schematic diagram of the system of a kind of information signal spread spectrum of the present invention and despreading.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer and more explicit, develop simultaneously embodiment pair referring to the drawings
The present invention is further described.It should be appreciated that specific embodiment described herein is used only for explaining the present invention, and do not have to
It is of the invention in limiting.
It, may after communicating for a long time due in the spread spectrum that uses in the prior art, recycling the same PN sequences
Information security hidden danger caused by meeting, the present invention provides a kind of sides that the information signal of drawbacks described above can be overcome to spread and de-spread
Method and system first illustrate following noun to preferably be parsed to method and system provided by the present invention：
Sequence：The Serial No. being made of a string 0 or 1；
Sequence to be passed：For the sequence for needing the digital coding of the voice signal sent out to be formed, frequency is far below cycle
PN sequences；
Standard PN sequences：Sequence that is one long, not recycling；
Basic PN sequences：Specific mathematical operation is passed through to standard PN sequences（It such as negates, backward）Obtained sequence；
Cycle P N sequences：It is the sequence of the cycle output of basis PN sequences for communication process to identify the sequence of communication；
Initial bits serial number：Each in standard PN sequences is numbered by 1 successively, first bit in PN sequences
Serial number in standard PN sequences, referred to as initial bits serial number；
Sequence spreading：For sequence to be passed and PN sequences with or after obtained sequence；
Receive sequence：The sequence mentioned after demodulated for the signal that receives；
Sequence to be sentenced：For receive sequence and cycle P N sequences with or after obtained sequence.
A kind of method of information signal spread spectrum reconciliation frequency provided by the present invention, as shown in figure 3, the method includes：
S1, base station are that mobile terminal distributes initial bits serial number and mode code, and by the initial bits serial number and pattern
Code is sent to mobile terminal；The mode code is corresponding with the mathematical operation mode carried out to standard PN sequences.
The mode code, is string of code, each expression of mode code to the mathematical operation modes of standard PN sequences, each
Operation mode is to map one by one；Wherein, the mathematical operation mode to standard PN sequences, everybody negates, backward etc.；
About the mathematical operation mode to standard PN sequences base station and movement are previously stored in the correspondence of each in mode code
In terminal.
Initial bits serial number base station is first bit in the cycle P N sequences of mobile terminal distribution in standard PN
The serial number arranged in serial number.
Therefore after base station is that mobile terminal is assigned with initial bits serial number and mode code, mobile terminal receives the starting
Bit sequence and mode code can obtain the cycle P N communicated between base station according to pre-stored standard PN sequences
Serial number.
S2, base station and mathematical operation mode of the mobile terminal corresponding to the mode code are by pre-stored mark
Quasi- PN is Sequence Transformed at basic PN sequences, and according to the initial bits serial number and basis PN sequences, obtains cycle P N sequences.
Specifically, base station and mobile terminal are Sequence Transformed at basic PN sequences according to mode code institute standard PN first, it is described
Mathematical operation corresponding to mode code may be：Number in sequence is negated, backward etc., according to will be arranged in basic PN sequences
The digital coding of initial bits serial number described in serial number comes first principle, and cycle P N sequences are obtained based on the basis PN sequences
Row.
S3, when mobile terminal or base station send information, by the low frequency digital sequence of information to be transmitted and cycle P N sequences
It arranges corresponding digital number and carries out same or operation, be expanded sequence, and will be sent after sequence spreading modulation.
When sender carries out information signal transmission, first by low frequency digital sequence and cycle P N sequences with transmission information
Carry out with or operation, it is specific with or operation method it is identical to those shown in Fig. 1, when in low frequency digital sequence number 1 or 0 with follow
When corresponding number 1 or 0 is identical in ring PN sequences, then the number obtained is 1, if number 1 in low frequency digital sequence or 0 with recycle
When corresponding number 1 or 0 differs in PN sequences, then the number obtained is 0, to correspond the sequence that is expanded.Work as transmission
After side obtains sequence spreading, after the sequence spreading is modulated, send.
S4, base station or mobile terminal receive the sequence spreading sent from other side, the sequence spreading that will be received
After digital number corresponding with cycle P N sequences carries out same or operation, sequence to be sentenced is obtained, and sequence to be sentenced described in judgement is
No is high frequency series；If so, abandoning, otherwise, it is determined that the sequence to be sentenced is the information signal that communication counterpart is sent.
After recipient receives sequence spreading, sequence spreading is extracted in demodulation first, and by the sequence spreading and recycles
After PN sequences carry out same or operation, low frequency digital sequence is obtained, to obtain the low-frequency information that sender sends out.Due to recipient
Multiple sequence spreadings from sender may be received, at that time only recipient according to cycle P N sequence pairs sequence spreading into
Row with or operation after, obtained sequence is low frequency digital sequence, and just think that it obtains is that sender is sent to the recipient
Communication code.
Further include before the step S1：
S01, the standard PN sequences transmitted for information signal are prestored in base station and mobile terminal.
Described information signal spread-spectrum communicates and the method for despread communications, wherein further includes before the step A：
S02, multiple mode codes are prestored in base station and mobile terminal, the mode code is carried out with to standard PN sequences
Mathematical operation mode correspond.
In the step S1, base station is that the number of communications of the mode code and base station and mobile terminal of mobile terminal distribution is followed
Ring corresponds to, and this sub-distribution is arranged in the mode code of the last latter position of allocation model code.
In communication process, used PN sequences are communicated each time and are different, communicate used PN sequences each time
The basic PN sequence loops obtained after arranging the specific mathematical operation mode operation referred to through a bit pattern code by standard PN sequences
It obtains；And used when communicating each time is that who mode code is：By the number of communication, successively in use pattern code
Each, more particularly, if preceding primary communication uses last position in mode code, in this communication use pattern code
First.
For example, have 20 kinds of mathematical operation modes to standard PN sequences, by these mathematical operation modes be expressed as m1, m2,
M3 ..., m20, each of mode code is exactly one of m1~m20, each time communicate used in PN sequences by marking
The basic PN sequence loops obtained after the specific mathematical operation mode operation that quasi- PN sequences are referred to through a bit pattern code obtain；And
Used when communicating each time is that who mode code is：By the number of communication, each in use pattern code successively, compared with
Particularly, if preceding primary communication uses last position in mode code, first in this communication use pattern code；
For example used when present communications is the 2nd in mode code, then when communicating next time it is used be in mode code the 3rd
Position.
The synchronous communication of base station and mobile terminal, that is, used when current with the mobile terminal synchronization intercommunication in base station
Mode code；It is specific as follows：Base station（Or mobile terminal）Often executing allocation model code uses the distribution of base station last time to use
Mode code latter bit pattern code, for example the mobile terminal last time distribution be the 2nd bit pattern code, then mobile terminal this hair
Go out that information signal distributed is the 3rd bit pattern code.
To better illustrate this implementation, following citing is please referred to：
After initial bits serial number is sent to mobile terminal by base station, base station starts simultaneously at cycle output PN with mobile terminal
Sequence, in following Fig. 4（Initial bits are the 2nd bit）, for G2G3G4G5G6G1 cycle output, wherein G1 ~ G6 indicate 0 or
1；If the output speed of PN sequences is 1000000bps, then in 1us, output is G2, and output is G3 when 2us, successively class
It pushes away；Communicating pair is also to be spread and de-spread with the PN sequences, this is the prior art.
And the present invention then establish communicate when, base station also sends one in addition to initial bits serial number is sent to mobile terminal
A mode code for example has 20 kinds of mathematical operation modes to standard PN sequences, by these mathematical operation modes be expressed as m1, m2,
M3 ..., m20, each of mode code is exactly one of m1~m20；Mode code is m8m2m6 in this example；Then sender
（Base station or mobile terminal）When executing S200, first obtain the PN sequences of this spread spectrum, such as last sender execute S200 or
When S300 be m6 then this use m8, basic sequence is obtained to standard PN sequence G2G3G4G5G6G1 operations by m8 and is expressed as
H2H3H4H5H6H1, the PN sequences that are then expanded such as Fig. 5.In recipient（Base station or mobile terminal）When executing S300,
The extension PN sequences of this spread spectrum are first obtained, it is identical as aforementioned sender's process, then to obtained reception sequence and PN sequences
With or obtain sequence to be sentenced.
Based on the above method, it is the invention also discloses a kind of information signal spread spectrum communication and despread communications
System, as shown in fig. 6, the system comprises：Base station 1 and mobile terminal 2；
The base station 1 includes：Serial number and mode code distribution module 11, base station cyclic sequence generation module 12, base station signal
Modulation and transmission module 13 and base station sequence judgment module 14；
The serial number and mode code distribution module 11 are that mobile terminal distributes initial bits serial number and pattern for base station
Code, and the initial bits serial number and mode code are sent to mobile terminal；The mode code with to standard PN sequences carry out
Mathematical operation mode is corresponding；
The base station cyclic sequence generation module 12, will be pre- for the mathematical operation mode corresponding to the mode code
The standard PN first stored is Sequence Transformed at basic PN sequences, and according to the initial bits serial number and basis PN sequences, is followed
Ring PN sequences；
The base station signal modulation and transmission module 13 will be to be transmitted for base station or mobile terminal when sending information
The low frequency digital sequence of information digital number corresponding with cycle P N sequences carry out with or operation, be expanded sequence, and by institute
It is sent after stating sequence spreading modulation；
The base station sequence judgment module 14, for receiving the sequence spreading, by the sequence spreading received and cycle
After the corresponding digital number of PN sequences carries out same or operation, sequence to be sentenced is obtained, and whether sequence to be sentenced described in judgement is high
Frequency sequence；If so, abandoning, otherwise, it is determined that the sequence to be sentenced is the information signal that communication counterpart is sent；
The mobile terminal 2 includes：Terminal cyclic sequence generation module 21, terminal signaling modulation and transmission module 22 and terminal
Sequence judgment module 23；
The terminal cyclic sequence generation module 21, initial bits serial number and mode code for receiving base station distribution, root
It is according to the mathematical operation mode corresponding to the mode code that pre-stored standard PN is Sequence Transformed at basic PN sequences, and according to
The initial bits serial number and basis PN sequences, obtain cycle P N sequences；
The terminal signaling modulation and transmission module 22 is used for when mobile terminal sends information, by the low of information to be transmitted
Corresponding with the cycle P N sequences digital number of frequency Serial No. carry out with or operation, be expanded sequence, and by the extension sequence
It is sent after row modulation；
The terminal serial judgment module 23, the sequence spreading sent out for receiving base station, the extension that will be received
After sequence digital number corresponding with cycle P N sequences carries out same or operation, sequence to be sentenced, and sequence to be sentenced described in judgement are obtained
Whether row are high frequency series；If so, abandoning, otherwise, it is determined that the sequence to be sentenced is the information signal that communication counterpart is sent.
The base station further includes：Base station first prestores module；The mobile terminal further includes：Terminal first is deposited in advance
Store up module；
The base station first prestores module, for prestoring the standard PN transmitted for information signal in a base station
Sequence；
The terminal first prestores module, for the standard PN sequences in mobile terminal storage for information signal transmission
Row.
The base station further includes：Base station second prestores module；The mobile terminal further includes：Terminal second is deposited in advance
Store up module；
The base station second prestores module, for prestoring multiple mode codes in a base station；
The terminal second prestores module, for prestoring multiple mode codes in the terminal；The pattern
Code is corresponded with the mathematical operation mode carried out to standard PN sequences.
The serial number and mode code distribution module further include：Base station is mode code and base station and the movement of mobile terminal distribution
The number of communications cycle of terminal corresponds to, and this sub-distribution is arranged in the mode code of the last latter position of allocation model code.
The present invention provides a kind of method and system of the spread spectrum and despreading of information signal, by being built in base station and mobile terminal
When vertical communication, base station is that mobile terminal distributes initial bits serial number and mode code, and by the initial bits serial number and mode code
It is sent to mobile terminal；The PN sequences that base station is used with mobile terminal in communication process are by standard PN sequences, starting ratio
Special serial number and mode code are determined；Base station is started simultaneously at mobile terminal with PN sequences described in identical rate-adaptive pacemaker；And logical
During letter, used PN sequences are communicated each time and are different, communicate used PN sequences each time by standard PN sequences
The basic PN sequence loops obtained after arranging the specific mathematical operation mode operation referred to through a bit pattern code obtain.Due to every
In communication process PN sequences be variation, it is constant with PN sequences in the prior art compared with, illegal point can be effectively prevent
Son is decoded and is monitored to communication process, and the confidentiality of communication process is improved.
It, can according to the technique and scheme of the present invention and its hair it is understood that for those of ordinary skills
Bright design is subject to equivalent substitution or change, and all these changes or replacement should all belong to the guarantor of appended claims of the invention
Protect range.
Claims (4)
1. a kind of method of information signal spread spectrum communication and despread communications, which is characterized in that including：
A, base station is that mobile terminal distributes initial bits serial number and mode code, and the initial bits serial number and mode code are sent
To mobile terminal；The mode code is corresponding with the mathematical operation mode carried out to standard PN sequences；
B, base station and mathematical operation mode of the mobile terminal corresponding to the mode code are by pre-stored standard PN
It is Sequence Transformed at basic PN sequences, and according to the initial bits serial number and basis PN sequences, obtain cycle P N sequences；
C, when mobile terminal or base station send information, the low frequency digital sequence of information to be transmitted is opposite with cycle P N sequences
Digital number is answered to carry out same or operation, be expanded sequence, and will be sent after sequence spreading modulation；
D, base station or mobile terminal receive the sequence spreading sent from other side, by the sequence spreading received and cycle
After the corresponding digital number of PN sequences carries out same or operation, sequence to be sentenced is obtained, and whether sequence to be sentenced described in judgement is high
Frequency sequence；If so, abandoning, otherwise, it is determined that the sequence to be sentenced is the information signal that communication counterpart is sent；
Further include before the step A：
A01：The standard PN sequences transmitted for information signal are prestored in base station and mobile terminal；
A02：Multiple mode codes, the mode code and the number carried out to standard PN sequences are prestored in base station and mobile terminal
Student movement is calculated mode and is corresponded.
2. the method for information signal spread spectrum communication and despread communications according to claim 1, which is characterized in that in the step
In A, base station is that the mode code of mobile terminal distribution is corresponding with the number of communications of base station and mobile terminal cycle, and this sub-distribution is arranged
It is listed in the mode code of the last latter position of allocation model code.
3. a kind of system of information signal spread spectrum communication and despread communications, which is characterized in that including：Base station and mobile terminal；
The base station includes：Serial number sends mould with mode code distribution module, base station cyclic sequence generation module, base station signal modulation
Block and base station sequence judgment module；
The serial number and mode code distribution module distribute initial bits serial number and mode code for base station for mobile terminal, and will
The initial bits serial number and mode code are sent to mobile terminal；The mode code and the mathematical operation that standard PN sequences are carried out
Mode is corresponding；
The base station cyclic sequence generation module will be prestored for the mathematical operation mode corresponding to the mode code
Standard PN it is Sequence Transformed at basic PN sequences, and according to the initial bits serial number and basis PN sequences, obtain cycle P N sequences
Row；
The base station signal modulation and transmission module, for base station or mobile terminal when sending information, by information to be transmitted
Corresponding with the cycle P N sequences digital number of low frequency digital sequence carry out with or operation, be expanded sequence, and by the extension
It is sent after sequence modulation；
The base station sequence judgment module, for receiving the sequence spreading, by the sequence spreading received and cycle P N sequences
After corresponding digital number carries out same or operation, sequence to be sentenced is obtained, and whether sequence to be sentenced described in judgement is high frequency series；
If so, abandoning, otherwise, it is determined that the sequence to be sentenced is the information signal that communication counterpart is sent；
The mobile terminal includes：Terminal cyclic sequence generation module, terminal signaling modulation and transmission module and terminal serial judge
Module；
The terminal cyclic sequence generation module, initial bits serial number and mode code for receiving base station distribution, according to described
Mathematical operation mode corresponding to mode code is Sequence Transformed at basic PN sequences by pre-stored standard PN, and according to described
Beginning bit sequence and basis PN sequences, obtain cycle P N sequences；
The terminal signaling modulation and transmission module is used for when mobile terminal sends information, by the low frequency digital of information to be transmitted
Sequence digital number corresponding with cycle P N sequences carries out same or operation, and be expanded sequence, and the sequence spreading is modulated
After send；
The terminal serial judgment module, the sequence spreading sent out for receiving base station, by the sequence spreading received with
The corresponding digital number of cycle P N sequences carry out with or operation after, obtain sequence to be sentenced, and sequence to be sentenced described in judging whether
For high frequency series；If so, abandoning, otherwise, it is determined that the sequence to be sentenced is the information signal that communication counterpart is sent；
The base station further includes：Base station first prestores module；The mobile terminal further includes：Terminal first prestores mould
Block；
The base station first prestores module, for prestoring the standard PN sequences transmitted for information signal in a base station
Row；
The terminal first prestores module, for the standard PN sequences in mobile terminal storage for information signal transmission；
The base station further includes：Base station second prestores module；The mobile terminal further includes：Terminal second prestores mould
Block；
The base station second prestores module, for prestoring multiple mode codes in a base station；
The terminal second prestores module, for prestoring multiple mode codes in the terminal；The mode code with
The mathematical operation mode carried out to standard PN sequences corresponds.
4. the system of information signal spread spectrum communication and despread communications according to claim 3, which is characterized in that the serial number and
Mode code distribution module further includes：Base station is that the mode code of mobile terminal distribution and the number of communications of base station and mobile terminal recycle
It is corresponding, and this sub-distribution is arranged in the mode code of the last latter position of allocation model code.
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| CN1881857A (en) * | 1997-02-28 | 2006-12-20 | 交互数字技术公司 | Orthogonal code synchronization system and method for spread spectrum CDMA communications |
| WO2008014290A1 (en) * | 2006-07-24 | 2008-01-31 | Qualcomm Incorporated | Code interleaving for walsh codes |
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| CN104272617A (en) * | 2012-05-10 | 2015-01-07 | 株式会社Ntt都科摩 | Wireless communication system, mobile terminal, wireless base station, and wireless communication method |
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| CN1881857A (en) * | 1997-02-28 | 2006-12-20 | 交互数字技术公司 | Orthogonal code synchronization system and method for spread spectrum CDMA communications |
| CN101124741A (en) * | 2004-12-23 | 2008-02-13 | 高通股份有限公司 | Traffic interference cancellation |
| WO2008014290A1 (en) * | 2006-07-24 | 2008-01-31 | Qualcomm Incorporated | Code interleaving for walsh codes |
| CN104272617A (en) * | 2012-05-10 | 2015-01-07 | 株式会社Ntt都科摩 | Wireless communication system, mobile terminal, wireless base station, and wireless communication method |
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