CN115996070A - Transmission capacity improving method for spread spectrum anti-interference communication system - Google Patents
Transmission capacity improving method for spread spectrum anti-interference communication system Download PDFInfo
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Abstract
The disclosure relates to a transmission capacity improving method for a spread spectrum anti-interference communication system, which is applied to the technical field of information transmission. The method is applied to a transmitting end of a direct spread spectrum anti-interference communication system, and comprises the following steps: generating a plurality of direct spread spectrum chaotic sequences; based on the mapping relation of chaotic direct spread spectrum modulation between the incremental transmission information and the direct spread spectrum chaotic sequences, the chaotic spread spectrum modulation is carried out on a plurality of direct spread spectrum chaotic sequences according to the incremental transmission information, and the target direct spread spectrum chaotic sequences are determined. The method and the device have the advantages that the target direct spread spectrum chaotic sequence is driven to be selected through the increment transmission information to spread the original transmission information, and the information rate of the original transmission information is not affected. The method in the disclosure improves the information transmission capacity of the spread spectrum anti-interference communication system under the condition that the anti-interference performance and the communication rate of the original spread spectrum anti-interference communication system are not reduced, and the communication resources such as power, bandwidth and the like are not increased.
Description
Technical Field
The disclosure relates to the technical field of information transmission, and in particular relates to a transmission capacity improving method for a spread spectrum anti-interference communication system.
Background
In an anti-interference communication system, the anti-interference capability is generally improved by adopting a bandwidth expansion mode, and a frequency expansion technology is one of the bandwidth expansion modes, and comprises a direct frequency expansion technology and a frequency hopping frequency expansion technology. In a spread spectrum anti-interference communication system, after the bandwidth is expanded, the information transmission capacity is far lower than the limit value of the channel transmission capacity which can be achieved theoretically, but if the transmission capacity is increased in a mode of increasing the information transmission rate, the anti-interference performance of the communication system is reduced; if the information transmission capacity is increased by adopting a code division multiplexing mode, the power resource of the transmitting end is additionally increased.
Disclosure of Invention
To overcome the problems in the related art, the present disclosure provides a transmission capacity boosting method for a spread spectrum anti-interference communication system.
According to a first aspect of embodiments of the present disclosure, there is provided a transmission capacity boosting method for a spread spectrum anti-interference communication system, applied to a transmitting end of a direct spread spectrum anti-interference communication system, the method including:
generating a plurality of direct spread spectrum chaotic sequences;
and based on the chaotic direct spread spectrum modulation mapping relation between the incremental transmission information and the direct spread spectrum chaotic sequences, performing chaotic spread spectrum modulation on the plurality of direct spread spectrum chaotic sequences according to the incremental transmission information, and determining a target direct spread spectrum chaotic sequence.
In an exemplary embodiment, the method further comprises:
determining a morphological number 2^M of each symbol based on an information amount M loaded by each symbol in the incremental transmission information;
determining the generation quantity of the direct spread chaotic sequence according to the form quantity 2^M of each code element;
and if target code element position points with the cross correlation of the spread codes larger than a preset threshold value exist in different direct spread spectrum chaotic sequences, deleting the spread codes of the target code element position points in each direct spread spectrum chaotic sequence.
According to a second aspect of the embodiments of the present disclosure, there is provided a transmission capacity boosting method for a spread spectrum anti-interference communication system, applied to a receiving end of a direct spread spectrum anti-interference communication system, the method including:
generating a plurality of direct spread spectrum chaotic sequences;
determining a spreading code of the received information;
and determining the incremental transmission information sent by the receiving end according to the direct spread spectrum chaotic sequence corresponding to the spread spectrum code of the received information and the chaotic direct spread spectrum modulation mapping relation between the incremental transmission information and the direct spread spectrum chaotic sequence.
In an exemplary embodiment, the generating a plurality of direct spread chaotic sequences includes:
Synchronously generating a plurality of same direct spread spectrum chaotic sequences with the transmitting end;
and if target code element position points with the cross correlation of the spread codes larger than a preset threshold value exist in different direct spread spectrum chaotic sequences, deleting the spread codes of the target code element position points in each direct spread spectrum chaotic sequence.
According to a third aspect of the embodiments of the present disclosure, there is provided a transmission capacity boosting method for a spread spectrum anti-interference communication system, applied to a transmitting end of a frequency hopping spread spectrum anti-interference communication system, the method including:
generating a plurality of frequency hopping spread spectrum chaotic sequences;
and based on the mapping relation of the chaos frequency hopping spread spectrum modulation between the increment transmission information and the frequency hopping spread spectrum chaos sequences, performing chaos frequency hopping modulation on the plurality of frequency hopping spread spectrum chaos sequences according to the increment transmission information, and determining a target frequency hopping spread spectrum chaos sequence.
In an exemplary embodiment, the method further comprises:
determining a morphological number 2^M of each symbol based on an information amount M loaded by each symbol in the incremental transmission information;
determining the generation quantity of the frequency hopping spread spectrum chaotic sequence according to the form quantity 2^M of each code element;
and if the target code element position points with the same frequency point exist in different frequency hopping spread spectrum chaotic sequences, deleting the frequency point of the target code element position point in each frequency hopping spread spectrum chaotic sequence.
According to a fourth aspect of the embodiments of the present disclosure, there is provided a transmission capacity boosting method for a spread spectrum anti-interference communication system, applied to a receiving end of a frequency hopping spread spectrum anti-interference communication system, the method including:
generating a plurality of frequency hopping spread spectrum chaotic sequences;
determining a frequency point of the received information;
and determining the incremental transmission information sent by the receiving end according to the frequency hopping spread spectrum chaotic sequence corresponding to the frequency point of the received information and the chaotic frequency hopping spread spectrum modulation mapping relation between the incremental transmission information and the frequency hopping spread spectrum chaotic sequence.
In an exemplary embodiment, the generating a plurality of frequency-hopping spread-spectrum chaotic sequences includes:
synchronously generating a plurality of same frequency hopping spread spectrum chaotic sequences with the transmitting end;
and if the target code element position points with the same frequency point exist in different frequency hopping spread spectrum chaotic sequences, deleting the frequency point of the target code element position point in each frequency hopping spread spectrum chaotic sequence.
The method has the following beneficial effects: according to the method and the device, the target spread spectrum chaotic sequence is selected through the incremental transmission information to spread the original transmission information, the information rate of the original transmission information is not affected, and the information transmission capacity of the spread spectrum anti-interference communication system is improved under the condition that the anti-interference performance and the communication rate of the original spread spectrum anti-interference communication system are not reduced and the communication resources such as power and bandwidth are not increased.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a flow chart illustrating a transmission capacity boosting method for a spread spectrum interference-free communication system according to an exemplary embodiment;
fig. 2 is a schematic diagram of a direct spread chaotic sequence shown in accordance with an exemplary embodiment;
FIG. 3 is a schematic diagram of a direct spread chaotic sequence shown in accordance with an exemplary embodiment;
fig. 4 is a flow chart illustrating a transmission capacity boosting method for a spread spectrum interference-free communication system according to an exemplary embodiment;
fig. 5 is a flow chart illustrating a transmission capacity boosting method for a spread spectrum interference-free communication system according to an exemplary embodiment;
fig. 6 is a schematic diagram of a frequency hopping spread-spectrum chaotic sequence according to an exemplary embodiment;
fig. 7 is a schematic diagram of a frequency hopping spread-spectrum chaotic sequence according to an exemplary embodiment;
fig. 8 is a flow chart illustrating a transmission capacity boosting method for a spread spectrum interference-free communication system according to an exemplary embodiment;
Fig. 9 is a flow chart illustrating a transmission capacity boosting method for a spread spectrum interference-free communication system according to an exemplary embodiment;
fig. 10 is a flow chart illustrating a transmission capacity boosting method for a spread spectrum interference-free communication system according to an exemplary embodiment.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the invention. Rather, they are merely examples of apparatus and methods consistent with aspects of the invention as detailed in the accompanying claims.
In an exemplary embodiment of the present disclosure, in order to overcome the problem that the information transmission capacity is far lower than the limit value of the channel transmission capacity that can be achieved in theory after the bandwidth is extended by the spreading technique in the related art, a transmission capacity improving method for a spread spectrum anti-interference communication system is provided. The method is applied to a transmitting end of a direct spread spectrum anti-interference communication system, generates a plurality of direct spread spectrum chaotic sequences, carries out chaotic spread spectrum modulation on the plurality of direct spread spectrum chaotic sequences according to incremental transmission information based on a chaotic direct spread spectrum modulation mapping relation between the incremental transmission information and the direct spread spectrum chaotic sequences, and determines a target direct spread spectrum chaotic sequence. According to the method and the device, the original transmission information is spread by the direct spread spectrum chaotic sequence of the target selected by the increment transmission information, the information rate of the original transmission information is not affected, and the information transmission capacity of the spread spectrum anti-interference communication system is improved under the condition that the anti-interference performance and the communication rate of the original spread spectrum anti-interference communication system are not reduced and the communication resources such as power and bandwidth are not increased.
In an exemplary embodiment of the present disclosure, a transmission capacity improving method for a spread spectrum anti-interference communication system is provided, which is applied to a transmitting end of a direct spread spectrum anti-interference communication system. Fig. 1 is a flow chart illustrating a transmission capacity boosting method for a spread spectrum anti-interference communication system according to an exemplary embodiment, as shown in fig. 1, including the steps of:
step S101, generating a plurality of direct spread spectrum chaotic sequences;
step S102, based on the chaotic direct spread spectrum modulation mapping relation between the incremental transmission information and the direct spread spectrum chaotic sequences, performing chaotic spread spectrum modulation on a plurality of direct spread spectrum chaotic sequences according to the incremental transmission information, and determining a target direct spread spectrum chaotic sequence.
In the communication transmission process, a spread spectrum technology is generally adopted to improve the anti-interference capability of the communication process, the spread spectrum technology comprises a direct spread spectrum technology, namely, the spread spectrum technology performs spread spectrum modulation on baseband information by a spread spectrum code sequence, and the anti-interference capability of the communication transmission is improved by spreading the frequency spectrum of the baseband information. The transmitting end is an information source, the original transmission information is baseband information to be transmitted in the direct spread spectrum anti-interference communication system, and the incremental transmission information is baseband information to be additionally transmitted in the direct spread spectrum anti-interference communication system. In the direct spread spectrum anti-interference communication system, after the original transmission information is subjected to channel coding, the original transmission information is subjected to chaotic spread spectrum modulation by controlling and selecting a spread spectrum code sequence through the increment transmission information so as to spread the spectrum of the original transmission information.
A plurality of direct spread spectrum chaotic sequences are generated at a transmitting end of the direct spread spectrum anti-interference communication system, each direct spread spectrum chaotic sequence comprises at least one spread spectrum code of original transmission information, the number of chips of each spread spectrum code in the plurality of direct spread spectrum chaotic sequences is the same, and the generation mode of the direct spread spectrum chaotic sequences can be any mode capable of generating the direct spread spectrum chaotic sequences, for example, a logistic regression method is used for generating the direct spread spectrum chaotic sequences. In the generated direct spread spectrum chaotic sequences, based on the mapping relation of chaotic direct spread spectrum modulation between the incremental transmission information and the direct spread spectrum chaotic sequences, the mapping relation of the chaotic direct spread spectrum modulation is the mapping relation between code elements in the incremental transmission information and spread spectrum codes in the direct spread spectrum chaotic sequences, and the direct spread spectrum chaotic sequences corresponding to the incremental transmission information are selected through keying, namely the chaotic spread spectrum modulation is carried out on the direct spread spectrum chaotic sequences, so that the target direct spread spectrum chaotic sequences are determined. The spreading codes corresponding to the target direct spreading chaotic sequence are used as spreading codes of the original transmission information to directly spread the original transmission information, the original transmission information is modulated on each spreading code controlled by the incremental transmission information, the spreading ratio of the original transmission information is not affected, and as the spreading codes corresponding to the target direct spreading chaotic sequence are controlled by the incremental transmission information, the spread original transmission information is modulated by a carrier and then is sent to a receiving end, and the original transmission information and the incremental transmission information can be sent to the receiving end at the same time. Therefore, the method in the disclosure can improve the information transmission capacity of the spread spectrum anti-interference communication system under the condition that the anti-interference performance and the communication rate of the original spread spectrum anti-interference communication system are not reduced, and the communication resources such as power, bandwidth and the like are not increased.
The spread chaotic sequence is a spread code sequence with a chaotic pattern, and any other spread code sequence can be generated.
In an example, based on the mapping relationship between the incremental transmission information and the direct spread spectrum chaotic sequence, in step S102, the chaotic direct spread spectrum modulation is performed on the plurality of direct spread spectrum chaotic sequences according to the incremental transmission information, and the determining the target direct spread spectrum chaotic sequence includes:
determining the form number of each code element based on the information quantity M loaded by each code element in the increment transmission information;
determining the generation quantity of the direct spread chaotic sequence according to the form quantity 2^M of each code element;
if the target code element position points with the cross correlation of the spread codes larger than a preset threshold value exist in different direct spread spectrum chaotic sequences, deleting the spread codes of the target code element position points in each direct spread spectrum chaotic sequence.
When the information amount loaded by each code element in the incremental transmission information is Mbit information, each code element has 2^M forms, each form of the code element corresponds to one direct spread chaotic sequence, 2^M direct spread chaotic sequences are required to be generated, and each code element corresponds to one spread period. For example, when m=2, that is, when each symbol carries 2 bits of information, 2^M =4 direct spread chaotic sequences are generated at the transmitting end, and each direct spread chaotic sequence is numbered 0, 1, 2, and 3 respectively.
In an example, fig. 2 is a schematic diagram of a direct-spread chaotic sequence, as shown in fig. 2, where the value of a spreading code corresponding to each direct-spread chaotic sequence is determined by a method for generating the direct-spread chaotic sequence, the corresponding number of the spreading code in the figure is the number of each spreading code, three code element numbers included in incremental transmission information are respectively marked as a, b and c, each code element selects one spreading code corresponding to the direct-spread chaotic sequence from 4 direct-spread chaotic sequences for loading 2-bit transmission information through keying selection, for example, a code element with the number a selects a spreading code corresponding to the direct-spread chaotic sequence 1, namely, a spreading code 10, a code element with the number b selects a spreading code corresponding to the direct-spread chaotic sequence 3, namely, a spreading code 32, and a code element with the number c selects a spreading code corresponding to the direct-spread chaotic sequence 0, namely, a spreading code 04, and a spreading code corresponding to the target direct-spread chaotic sequence is a spreading code 10, a spreading code 32 and a spreading code 04.
Because when the cross correlation of the spreading codes of the same code element position of two different direct spread spectrum chaotic sequences is higher, one direct spread spectrum chaotic sequence is influenced to be selected by the code element, if the target code element position point with the cross correlation of the spreading codes larger than a preset threshold value exists in the different direct spread spectrum chaotic sequences, the spreading code of the target code element position point in each direct spread spectrum chaotic sequence is deleted. The preset threshold is an empirical value, and can be determined according to actual requirements, and is usually 0< a <1. The cross-correlation between two spreading codes is determined by the following formula:
Wherein r is AB Representing the cross-correlation between spreading code A and spreading code B, n representing the number of chips of spreading code A and spreading code B, p Ai Representing the value of the ith chip, p, in the spreading code A Bi Indicating the value of the ith chip in spreading code B.
In an example, when 4 direct-spread chaotic sequences are generated, fig. 3 is a schematic diagram of the direct-spread chaotic sequences shown in an exemplary embodiment, as shown in fig. 3, if the cross-correlation between the second symbol position point spreading code 01 and the fourth symbol position point spreading code 11 of each direct-spread chaotic sequence 0 and the direct-spread chaotic sequence 1 is greater than a preset threshold, the cross-correlation between the spreading code 03 and the spreading code 23 of the fourth symbol position point of the direct-spread chaotic sequence 0 and the direct-spread chaotic sequence 2 is greater than the preset threshold, when the direct-spread chaotic sequences are selected by the symbols at the second symbol position point and the fourth symbol position point, it cannot be determined which direct-spread chaotic sequence is selected by the symbols, so that the spreading codes of the second symbol position point and the fourth symbol position point of each direct-spread chaotic sequence in fig. 3 need to be deleted, that is, the spreading codes 01, 11, 21, 31, and 33, and the direct-spread sequences at the second symbol position point are deleted, and the direct-spread sequence is obtained by the direct-spread sequence of the map 2.
The degree of information transmission capacity improvement in the direct spread anti-interference communication system depends on the symbol rate and the number of direct spread chaotic sequences, and when the symbol rate is higher or the number of the direct spread chaotic sequences is more, the information transmission capacity improvement is higher, and the degree of information transmission capacity improvement can be expressed by the following formula:
wherein, the liquid crystal display device comprises a liquid crystal display device,R i represents an information transmission capacity increase value,Mindicating the amount of information loaded per symbol in the incremental transmission information,Rrepresents the symbol rate, r c Indicating the coding efficiency, i.e. the code rate.
For example, when the symbol rate is r=20kbaud/sec, m=2bit, code rate R c When=1/2, the method in the present disclosure can increase the information transmission capacity by 20kbps.
In an exemplary embodiment of the disclosure, a plurality of direct spread spectrum chaotic sequences are generated at a transmitting end of a direct spread spectrum anti-interference communication system, and based on a chaotic direct spread spectrum modulation mapping relationship between incremental transmission information and the direct spread spectrum chaotic sequences, the plurality of direct spread spectrum chaotic sequences are subjected to chaotic spread spectrum modulation according to the incremental transmission information, and a target direct spread spectrum chaotic sequence is determined. According to the method, the original transmission information is spread by the direct spread spectrum chaotic sequence of the target selected by the incremental transmission information drive, the information rate of the original transmission information is not affected, and the information transmission capacity of the spread spectrum anti-interference communication system is improved under the condition that the anti-interference performance and the communication rate of the original spread spectrum anti-interference communication system are not reduced and communication resources such as power and bandwidth are not increased.
In an exemplary embodiment of the present disclosure, a chaotic spread spectrum modulation method for improving a transmission capacity of a spread spectrum anti-interference communication is provided, which is applied to a receiving end of a direct spread spectrum anti-interference communication system. Fig. 4 is a flow chart illustrating a transmission capacity boosting method for a spread spectrum anti-interference communication system according to an exemplary embodiment, as shown in fig. 4, including the steps of:
step S401, generating a plurality of direct spread spectrum chaotic sequences;
step S402, determining a spread spectrum code of the received information;
step S403, determining the incremental transmission information sent by the receiving end according to the direct spread spectrum chaotic sequence corresponding to the spread spectrum code of the received information and the chaotic spread spectrum modulation mapping relation between the incremental transmission information and the direct spread spectrum chaotic sequence.
The receiving end represents a signal sink, and when the receiving end generates a plurality of direct spread spectrum chaotic sequences, the receiving end synchronously generates the same plurality of direct spread spectrum chaotic sequences with the transmitting end. For example, in the direct spread anti-interference communication system, when the transmitting end generates the direct spread chaotic sequence shown in fig. 3, the receiving end synchronously generates the direct spread chaotic sequence shown in fig. 3.
When a receiving end of the direct spread spectrum anti-interference communication system receives information sent by a sending end, namely when original transmission information which is spread and carrier modulated and sent by the sending end is received, a spreading code of the received information is determined, a direct spread spectrum chaotic sequence corresponding to the spreading code of the received information can be determined according to the position of the spreading code of the received information in the direct spread spectrum chaotic sequence, and the incremental transmission information sent by the sending end can be determined according to the direct spread spectrum chaotic sequence corresponding to the spreading code of the received information and the chaotic direct spread spectrum modulation mapping relation between the incremental transmission information and the direct spread spectrum chaotic sequence. After the receiving end determines the spreading code corresponding to the incremental transmission information, the receiving end despreads the received original transmission information to obtain the original transmission information after carrier modulation, then carries out carrier demodulation on the original transmission information after carrier modulation, and carries out channel decoding on the demodulated original transmission information, thus obtaining the original transmission information sent by the sending end.
In an example, when the information amount loaded by each symbol in the incremental transmission information is Mbit information, each symbol has 2^M shapes, each shape of the symbol corresponds to one direct spread chaotic sequence, 2^M direct spread chaotic sequences are generated, and each symbol corresponds to one spreading period. For example, when m=2, that is, each symbol carries 2 bits of information, the receiving end generates 2^M =4 direct-spread chaotic sequences, and each direct-spread chaotic sequence has numbers of 0, 1, 2 and 3, respectively, and generates 4 direct-spread chaotic sequences as shown in fig. 2, where a spreading code corresponding to each direct-spread chaotic sequence is the same as a spreading code corresponding to the direct-spread chaotic sequence of the transmitting end. When the receiving end determines that the spreading codes of the received information are the spreading codes 10, 32 and 04, according to the positions of the spreading codes of the received information in the direct spreading chaotic sequence, the direct spreading chaotic sequence corresponding to the spreading codes of the received information is determined, namely, according to fig. 2, the direct spreading chaotic sequence 1 corresponding to the spreading code 10 is determined, the direct spreading chaotic sequence 3 corresponding to the spreading code 32 is determined, the direct spreading chaotic sequence 0 corresponding to the spreading code 04 is determined, and then the information of three code elements in the incremental transmission information can be the information corresponding to the direct spreading chaotic sequence 1, the information corresponding to the direct spreading chaotic sequence 3 and the information corresponding to the direct spreading chaotic sequence 0 respectively.
In an exemplary embodiment, generating the plurality of direct spread chaotic sequences in step S401 includes:
synchronously generating a plurality of same direct spread spectrum chaotic sequences with a transmitting end;
if the target code element position points with the cross correlation of the spread codes larger than a preset threshold value exist in different direct spread spectrum chaotic sequences, deleting the spread codes of the target code element position points in each direct spread spectrum chaotic sequence.
In a receiving end of the direct spread anti-interference communication system, when the cross correlation of two direct spread chaotic sequences of received information is higher, the corresponding direct spread chaotic sequence cannot be determined, so if target code element position points with the cross correlation of spread codes larger than a preset threshold value exist in different direct spread chaotic sequences, the receiving end and the transmitting end synchronously delete the spread codes of the target code element position points in each direct spread chaotic sequence. The preset threshold is an empirical value, and can be determined according to actual requirements, and is usually 0< a <1. The cross-correlation between two spreading codes is determined by the following formula:
wherein r is AB Representing the cross-correlation between spreading code A and spreading code B, n representing the number of chips of spreading code A and spreading code B, p Ai Representing the value of the ith chip, p, in the spreading code A Bi Indicating the value of the ith chip in spreading code B.
In an example, if the cross-correlation between the second symbol position point spreading code 01 and the spreading code 11 of the direct-spread chaotic sequence 0 and the direct-spread chaotic sequence 1 is greater than a preset threshold, and the cross-correlation between the spreading code 03 and the spreading code 23 of the fourth symbol position point of the direct-spread chaotic sequence 0 and the direct-spread chaotic sequence 2 is greater than the preset threshold, then the spreading code 01, the spreading code 11, the spreading code 21 and the spreading code 31 at the second symbol position point and the spreading code 03, the spreading code 13, the spreading code 23 and the spreading code 33 at the fourth symbol position point in fig. 3 need to be deleted at the same time, and the subsequent symbol position point of each direct-spread chaotic sequence is advanced by one position to fill the deleted position, so as to obtain the direct-spread chaotic sequence shown in fig. 2.
In an exemplary embodiment of the present disclosure, a transmission capacity improving method for a spread spectrum anti-interference communication system is provided, which is applied to a transmitting end of a frequency hopping spread spectrum anti-interference communication system. Fig. 5 is a flow chart illustrating a transmission capacity boosting method for a spread spectrum anti-interference communication system according to an exemplary embodiment, as shown in fig. 5, including the steps of:
Step S501, generating a plurality of frequency hopping spread spectrum chaotic sequences;
step S502, based on the mapping relation of chaos frequency hopping spread spectrum modulation between the increment transmission information and the frequency hopping spread spectrum chaos sequence, chaos frequency hopping modulation is carried out on a plurality of frequency hopping spread spectrum chaos sequences according to the increment transmission information, and the target frequency hopping spread spectrum chaos sequence is determined.
In the communication transmission process, a spread spectrum technology is generally adopted to improve the anti-interference capability of the communication process, the spread spectrum technology comprises a frequency hopping spread spectrum technology, namely, the frequency hopping spread spectrum technology uses a carrier wave with continuously hopped frequency points to modulate baseband information to spread the frequency spectrum of the baseband information, and the anti-interference capability of the communication transmission is improved. The transmitting end is an information source, the original transmission information is baseband information to be transmitted in the frequency hopping spread spectrum anti-interference communication system, and the incremental transmission information is baseband information to be additionally transmitted in the frequency hopping spread spectrum anti-interference communication system. In the frequency hopping spread spectrum anti-interference communication system, the frequency position of the carrier frequency point of the original transmission information is controlled through the increment transmission information, after the original transmission information is subjected to channel coding, the carrier frequency point continuously hopped carrier is used for carrying out carrier modulation on the original transmission information after the channel coding, and the carrier modulation method can be any modulation method, such as phase modulation, amplitude modulation and the like.
A plurality of frequency hopping spread spectrum chaotic sequences are generated at a transmitting end of the frequency hopping spread spectrum anti-interference communication system, each frequency hopping spread spectrum chaotic sequence comprises at least one carrier frequency point of original transmission information, and the frequency hopping spread spectrum chaotic sequence can be generated in any generation mode, for example, a logistic regression method is adopted to generate a plurality of frequency hopping spread spectrum chaotic sequences. And in the generated plurality of frequency hopping and frequency spreading chaotic sequences, based on the mapping relation of the chaotic frequency hopping and frequency spreading modulation between the incremental transmission information and the frequency hopping and frequency spreading chaotic sequences, the mapping relation of the chaotic frequency hopping and frequency spreading modulation represents the mapping relation of code elements of the incremental transmission information and frequency points of the frequency hopping and frequency spreading chaotic sequences, and the frequency hopping and frequency spreading chaotic sequences corresponding to the incremental transmission information are selected through keying, namely the plurality of frequency hopping and frequency spreading chaotic sequences are subjected to chaotic frequency hopping modulation so as to determine the target frequency hopping and frequency spreading chaotic sequences. Modulating original transmission information by taking a frequency hopping frequency point corresponding to a target frequency hopping spread spectrum chaotic sequence as a carrier frequency point of the original transmission information, modulating the original transmission information on each frequency hopping frequency point controlled by the incremental transmission information, wherein the information rate, the frequency hopping speed and the frequency hopping bandwidth of the original transmission information are not affected, and transmitting the information after carrier modulation to a receiving end due to the fact that the target frequency hopping spread spectrum chaotic sequence is controlled by the incremental transmission information, namely transmitting the original transmission information and the incremental transmission information to the receiving end simultaneously. Therefore, the method in the disclosure can improve the information transmission capacity of the spread spectrum anti-interference communication system under the condition that the anti-interference performance and the communication rate of the original spread spectrum anti-interference communication system are not reduced, and the communication resources such as power, bandwidth and the like are not increased.
The frequency hopping spread spectrum chaotic sequence is a frequency point sequence with a chaotic pattern, and other random frequency point sequences can be generated.
In an example, based on the mapping relationship between the incremental transmission information and the hopping spread spectrum chaotic sequence, in step S502, the chaotic hopping modulation is performed on the plurality of hopping spread spectrum chaotic sequences according to the incremental transmission information, and the determining the target hopping spread spectrum chaotic sequence includes:
determining the form number of each code element based on the information quantity M loaded by each code element in the increment transmission information;
determining the generation quantity of the frequency hopping spread spectrum chaotic sequence according to the form quantity 2^M of each code element;
and if the target code element position points of the same frequency point exist in different frequency hopping spread spectrum chaotic sequences, deleting the frequency point of the target code element position point in each frequency hopping spread spectrum chaotic sequence.
When the information amount loaded by each code element in the incremental transmission information is Mbit information, each code element has 2^M forms, each form of the code element corresponds to one frequency hopping frequency spreading chaotic sequence, 2^M frequency hopping frequency spreading chaotic sequences are required to be generated, and each code element corresponds to one frequency spreading period. For example, when m=2, that is, when each symbol carries 2 bits of information, 2^M =4 hopping spread chaotic sequences are generated at the transmitting end, and each hopping spread chaotic sequence is numbered 0, 1, 2, and 3, respectively.
In the frequency hopping spread spectrum anti-interference communication system, fig. 6 is a schematic diagram of a frequency hopping spread spectrum chaotic sequence shown in an exemplary embodiment, as shown in fig. 6, a frequency hopping point corresponding to each frequency hopping spread spectrum chaotic sequence is determined by a method for generating the frequency hopping spread spectrum chaotic sequence, three code element numbers included in incremental transmission information are respectively marked as a, b and c, each code element selects one frequency hopping point corresponding to the frequency hopping spread spectrum chaotic sequence from 4 frequency hopping spread spectrum chaotic sequences through keying selection, for loading 2bit transmission information, for example, a code element with the number a selects the frequency hopping point corresponding to the frequency hopping spread spectrum chaotic sequence 1, namely the frequency hopping point 897, a code element with the number b selects the frequency hopping point corresponding to the frequency hopping spread spectrum chaotic sequence 3, namely the frequency hopping point 876, a code element with the number c selects the frequency hopping point corresponding to the frequency hopping spread spectrum chaotic sequence 0, namely the frequency hopping point 786, and a frequency hopping point corresponding to the target frequency hopping spread spectrum chaotic sequence is the frequency hopping point 897, the frequency hopping point 876 and the frequency hopping point 786.
Because one code element can not select two frequency hopping frequency spreading chaotic sequences at the same time, if target code element position points with the same frequency point exist in different frequency hopping frequency spreading chaotic sequences, the frequency point of the target code element position point in each frequency hopping frequency spreading chaotic sequence is deleted. When 4 hopping spread chaotic sequences are generated, fig. 7 is a schematic diagram of the hopping spread chaotic sequence shown in an exemplary embodiment, as shown in fig. 7, the second symbol position points of the hopping spread chaotic sequence 0 and the hopping spread chaotic sequence 1 are all frequency points 915, the fourth symbol position points of the hopping spread chaotic sequence 0, the hopping spread chaotic sequence 2 and the hopping spread chaotic sequence 3 are all frequency points 257, when a symbol selects the hopping spread chaotic sequence at the second symbol position point and the fourth symbol position point, which hopping spread chaotic sequence is selected by the symbol cannot be determined, so that the frequency points of the second symbol position point and the fourth symbol position point of each hopping spread chaotic sequence in fig. 3 need to be deleted, namely, the frequency points 915, 45 and 612 at the second symbol position point, the frequency points 257 and 548 at the fourth symbol position point are deleted, and the subsequent symbol position point of each hopping spread chaotic sequence is advanced to the same position point, namely, the frequency point 7 is deleted, and the target frequency hopping spread chaotic sequence is deleted.
The degree of information transmission capacity improvement in the frequency hopping spread spectrum anti-interference communication system depends on the frequency hopping rate and the number of frequency hopping spread spectrum chaotic sequences, and when the frequency hopping rate is higher or the number of frequency hopping spread spectrum chaotic sequences is higher, the degree of information transmission capacity improvement is higher, and can be represented by the following formula:
wherein, the liquid crystal display device comprises a liquid crystal display device,Rirepresents an information transmission capacity increase value,Mindicating the amount of information loaded per symbol in the incremental transmission information,Rhrepresenting the frequency hopping rate, i.e. the inverse of the frequency hopping period,rcrepresenting the code rate.
For example, when the frequency hopping rate isRh20000 hop/s, m=2bit, code ratercWhen=1/2, the method in the present disclosure can increase the information transmission capacity by 20kbps.
In an exemplary embodiment of the present disclosure, a transmitting end of a frequency hopping spread spectrum anti-interference communication system generates a plurality of frequency hopping spread spectrum chaotic sequences, performs chaotic frequency hopping modulation on the plurality of frequency hopping spread spectrum chaotic sequences according to incremental transmission information based on a chaotic frequency hopping spread spectrum modulation mapping relationship between incremental transmission information and the frequency hopping spread spectrum chaotic sequences, and determines a target frequency hopping spread spectrum chaotic sequence. According to the method, the target frequency hopping spread spectrum chaotic sequence is selected through incremental transmission information driving to carry out frequency hopping spread spectrum on the original transmission information, the information rate of the original transmission information is not affected, and the information transmission capacity of the spread spectrum anti-interference communication system is improved under the condition that the anti-interference performance and the communication rate of the original spread spectrum anti-interference communication system are not reduced, and the communication resources such as power, bandwidth and the like are not increased.
In an exemplary embodiment of the present disclosure, a chaotic spread spectrum modulation method for improving a transmission capacity of spread spectrum anti-interference communication is provided, which is applied to a receiving end of a frequency hopping spread spectrum anti-interference communication system. Fig. 8 is a flowchart illustrating a transmission capacity boosting method for a spread spectrum anti-interference communication system according to an exemplary embodiment, as shown in fig. 8, including the steps of:
step S801, generating a plurality of frequency hopping spread spectrum chaotic sequences;
step S802, determining a frequency point of the received information;
step 803, determining the incremental transmission information sent by the receiving end according to the frequency hopping spread spectrum chaotic sequence corresponding to the frequency point of the received information and the chaotic frequency hopping spread spectrum modulation mapping relation between the incremental transmission information and the frequency hopping spread spectrum chaotic sequence.
The receiving end represents a signal sink, and when the receiving end generates a plurality of frequency hopping spread spectrum chaotic sequences, the receiving end synchronously generates the same plurality of frequency hopping spread spectrum chaotic sequences with the transmitting end. For example, in the frequency hopping spread spectrum anti-interference communication system, when the transmitting end generates the frequency hopping spread spectrum chaotic sequence shown in fig. 6, the receiving end synchronously generates the frequency hopping spread spectrum chaotic sequence shown in fig. 6.
When a receiving end of the frequency hopping spread spectrum anti-interference communication system receives information sent by a sending end, namely, when the receiving end receives information on a frequency hopping frequency point corresponding to a target frequency hopping spread spectrum chaotic sequence sent by the sending end, the frequency point of the received information is determined, the frequency hopping spread spectrum chaotic sequence corresponding to the frequency point of the received information can be determined according to the position of the frequency point of the received information in the frequency hopping spread spectrum chaotic sequence, and the increment transmission information sent by the receiving end can be determined according to the frequency hopping spread spectrum chaotic sequence corresponding to the frequency point of the received information and the chaotic frequency hopping modulation mapping relation between the increment transmission information and the frequency hopping spread spectrum chaotic sequence. After receiving the primary transmission information modulated by the carrier wave, the receiving end demodulates the primary transmission information modulated by the carrier wave according to the frequency hopping frequency point corresponding to the determined incremental transmission information, and then carries out channel decoding on the demodulated primary transmission information, thus obtaining the primary transmission information sent by the sending end.
In an example, the target frequency-hopping spread-spectrum chaotic sequence is demodulated according to the code elements in the incremental transmission information, when the information amount loaded by each code element in the incremental transmission information is Mbit information, each code element has 2^M forms, each form of the code element corresponds to one frequency-hopping spread-spectrum chaotic sequence, 2^M frequency-hopping spread-spectrum chaotic sequences are generated, and each code element corresponds to one frequency-hopping period. For example, when m=2, that is, when each symbol is loaded with 2 bits of information, the receiving end generates 2^M =4 hopping spread chaotic sequences, and each of the hopping spread chaotic sequences has numbers of 0, 1, 2 and 3, respectively, and generates 4 hopping spread chaotic sequences as shown in fig. 6, where the hopping frequency point corresponding to each of the hopping spread chaotic sequences is the same as the hopping frequency point corresponding to the hopping spread chaotic sequence of the transmitting end. When the receiving end determines that the frequency point of the received information is the frequency point 897, the frequency point 876 and the frequency point 786, according to the position of the frequency point of the received information in the frequency hopping spread chaotic sequence, the frequency hopping spread chaotic sequence corresponding to the frequency point of the received information is determined, namely, according to fig. 6, the frequency point 897 corresponds to the frequency hopping spread chaotic sequence 1, the frequency point 876 corresponds to the frequency hopping spread chaotic sequence 3 and the frequency point 786 corresponds to the frequency hopping spread chaotic sequence 0, the information of three code elements in the incremental transmission information can be determined to be the information corresponding to the frequency hopping spread chaotic sequence 1, the information corresponding to the frequency hopping spread chaotic sequence 3 and the information corresponding to the frequency hopping spread chaotic sequence 0 respectively.
In an exemplary embodiment, generating a plurality of frequency-hopping spread-spectrum chaotic sequences in step S801 includes:
synchronously generating a plurality of same frequency hopping spread spectrum chaotic sequences with a transmitting end;
and if the target code element position points of the same frequency point exist in different frequency hopping spread spectrum chaotic sequences, deleting the frequency point of the target code element position point in each frequency hopping spread spectrum chaotic sequence.
In the frequency hopping spread spectrum anti-interference communication system, when two or more frequency hopping spread spectrum chaotic sequences receive information at the same time, the corresponding frequency hopping spread spectrum chaotic sequences cannot be determined, so if target code element position points with the same frequency point exist in different frequency hopping spread spectrum chaotic sequences, a transmitting end deletes the frequency point of the target code element position point in each frequency hopping spread spectrum chaotic sequence, and a receiving end synchronously deletes the frequency point of the target code element position point in each frequency hopping spread spectrum chaotic sequence. For example, as shown in fig. 7, the second symbol position points of the frequency-hopping spread chaotic sequence 0 and the frequency-hopping spread chaotic sequence 1 are all frequency points 915, and the fourth symbol position points of the frequency-hopping spread chaotic sequence 0, the frequency-hopping spread chaotic sequence 2 and the frequency-hopping spread chaotic sequence 3 are all frequency points 257, so that the frequency points of the second symbol position point and the fourth symbol position point of each frequency-hopping spread chaotic sequence in fig. 3 need to be deleted at the same time, and the next bit position point of each frequency-hopping spread chaotic sequence is advanced by one position, so that the deleted position is filled, and the frequency-hopping spread chaotic sequence shown in fig. 6 is obtained.
In an exemplary embodiment of the present disclosure, a chaotic spread spectrum modulation method for improving a transmission capacity of spread spectrum anti-interference communication is provided, which is applied to a direct spread spectrum anti-interference communication system. Fig. 9 is a flowchart illustrating a transmission capacity boosting method for a spread spectrum anti-interference communication system according to an exemplary embodiment, as shown in fig. 9, including the steps of:
step S901, synchronously generating a plurality of same direct spread spectrum chaotic sequences at a transmitting end and a receiving end respectively;
step S902, based on a chaotic direct spread spectrum modulation mapping relation between incremental transmission information and a direct spread spectrum chaotic sequence, performing chaotic spread spectrum modulation on a plurality of direct spread spectrum chaotic sequences according to the incremental transmission information, and determining a target direct spread spectrum chaotic sequence;
determining a morphological number 2^M of each symbol based on an information amount M loaded by each symbol in the incremental transmission information;
in an example, if each symbol in the incremental transmission information is loaded with an information amount of 2 bits, the morphological quantity of each symbol is 2^2 =4, and the information corresponding to each symbol is one of 00, 01, 10 and 11;
determining the number of direct spread chaotic sequences according to the morphological number 2^M of each code element;
in an example, determining to generate 4 direct spread chaotic sequences, which are a direct spread chaotic sequence 0, a direct spread chaotic sequence 1, a direct spread chaotic sequence 2 and a direct spread chaotic sequence 3, wherein each direct spread chaotic sequence corresponds to one form of a code element, the direct spread chaotic sequence 0 corresponds to information 00, the direct spread chaotic sequence 1 corresponds to information 01, the direct spread chaotic sequence 2 corresponds to information 10, and the direct spread chaotic sequence 3 corresponds to information 11;
Thus, a direct spread chaotic sequence shown in fig. 3 is generated, if target code element position points with cross correlation of spread codes larger than a preset threshold value exist in different direct spread chaotic sequences, a receiving end and a transmitting end synchronously delete the spread codes of the target code element position points in each direct spread chaotic sequence, so that the spread codes corresponding to a second code element position point and a fourth code element position point in each direct spread chaotic sequence in fig. 3 are deleted, and the direct spread chaotic sequence shown in fig. 2 is obtained.
In an example, the information loaded by three symbols in the incremental transmission information is 01, 11 and 00 respectively, the transmitting end selects, through keying, a spreading code corresponding to a direct spreading chaotic sequence of corresponding information from 4 direct spreading chaotic sequences for each symbol to be used for loading 2bit transmission information, namely, a symbol a of the loaded information 01 selects a direct spreading chaotic sequence 1, a symbol b of the loaded information 11 selects a direct spreading chaotic sequence 3, a symbol c of the loaded information 00 selects a direct spreading chaotic sequence 0, and the spreading code corresponding to the target direct spreading chaotic sequence is a spreading code 10, a spreading code 32 and a spreading code 04;
step S903, the transmitting end carries out channel coding to the original transmission information;
Step S904, the transmitting end performs spread spectrum modulation on the coded original transmission information through a spread spectrum code corresponding to the target direct spread spectrum chaotic sequence;
step S905, the transmitting end performs carrier modulation on the original transmission information after spread spectrum modulation;
step S906, the transmitting end transmits the original transmission information after carrier modulation to the receiving end, namely, simultaneously transmits the incremental transmission information corresponding to the target direct spread spectrum chaotic sequence to the receiving end;
step S907, the receiving end determines the spreading code of the received information;
step S908, the receiving end determines to receive the incremental transmission information sent by the sending end according to the direct spread spectrum chaotic sequence corresponding to the spread spectrum code of the received information;
in an example, the receiving end receives information on the spreading code 10, the spreading code 32 and the spreading code 04 respectively, the spreading code 10 corresponds to the direct spreading chaotic sequence 1, the loading information is determined to be 01, the spreading code 32 corresponds to the direct spreading chaotic sequence 3, the loading information is determined to be 11, the spreading code 04 corresponds to the direct spreading chaotic sequence 0, the loading information is determined to be 00, and thus the received incremental transmission information is determined to be 01100;
step S909, the receiving end despreads the original transmission information after carrier modulation according to the spreading code of the received information;
Step S910, the receiving end performs carrier demodulation on the despread original transmission information;
in step S911, the receiving end performs channel decoding on the original transmission information after carrier demodulation to obtain the original transmission information.
In an exemplary embodiment of the present disclosure, a chaotic spread spectrum modulation method for improving a transmission capacity of spread spectrum anti-interference communication is provided, which is applied to a frequency hopping spread spectrum anti-interference communication system. Fig. 10 is a flowchart illustrating a transmission capacity boosting method for a spread spectrum anti-interference communication system according to an exemplary embodiment, as shown in fig. 10, including the steps of:
step S1001, synchronously generating a plurality of same frequency hopping spread spectrum chaotic sequences at a transmitting end and a receiving end respectively;
step S1002, based on a mapping relation of chaos frequency hopping spread spectrum modulation between increment transmission information and frequency hopping spread spectrum chaos sequences, performing chaos frequency hopping modulation on a plurality of frequency hopping spread spectrum chaos sequences according to the increment transmission information, and determining a target frequency hopping spread spectrum chaos sequence;
determining a morphological number 2^M of each symbol based on an information amount M loaded by each symbol in the incremental transmission information;
in an example, if each symbol in the incremental transmission information is loaded with an information amount of 2 bits, the morphological quantity of each symbol is 2^2 =4, and the information corresponding to each symbol is one of 00, 01, 10 and 11;
Determining the number of the frequency hopping spread spectrum chaotic sequences according to the morphological number 2^M of each code element;
in an example, determining to generate 4 frequency-hopping spread chaotic sequences, which are respectively a frequency-hopping spread chaotic sequence 0, a frequency-hopping spread chaotic sequence 1, a frequency-hopping spread chaotic sequence 2 and a frequency-hopping spread chaotic sequence 3, wherein each frequency-hopping spread chaotic sequence corresponds to one form of a code element, the frequency-hopping spread chaotic sequence 0 corresponds to information 00, the frequency-hopping spread chaotic sequence 1 corresponds to information 01, the frequency-hopping spread chaotic sequence 2 corresponds to information 10, and the frequency-hopping spread chaotic sequence 3 corresponds to information 11;
thus, the frequency hopping spread chaotic sequence shown in fig. 7 is generated, if target code element position points of the same frequency point exist in different frequency hopping spread chaotic sequences, frequency points at the target code element position points in each frequency hopping spread chaotic sequence are deleted, and therefore frequency points corresponding to a second code element position point and a fourth code element position point in each frequency hopping spread chaotic sequence in fig. 7 are deleted, and the frequency hopping spread chaotic sequence shown in fig. 6 is obtained.
In an example, the information corresponding to three symbols in the incremental transmission information is 01, 11 and 00 respectively, the transmitting end selects one frequency hopping point corresponding to the frequency hopping and spreading chaotic sequence from 4 frequency hopping and spreading chaotic sequences for loading 2bit transmission information through keying according to the information loaded by each symbol, namely, the symbol of loading information 01 selects the frequency hopping and spreading chaotic sequence 1, the symbol of loading information 11 selects the frequency hopping and spreading chaotic sequence 3, the symbol of loading information 00 selects the frequency hopping and spreading chaotic sequence 0, and the frequency hopping point corresponding to the target frequency hopping and spreading chaotic sequence is frequency point 898, frequency point 886 and frequency point 886;
Step S1003, the transmitting end carries out channel coding on the original transmission information;
step S1004, the transmitting end carries out carrier modulation on the coded original transmission information through a frequency hopping frequency point corresponding to the target frequency hopping frequency spreading chaotic sequence;
step S1005, the transmitting end transmits the original transmission information after carrier modulation to the receiving end, namely, simultaneously transmits the incremental transmission information corresponding to the frequency hopping points corresponding to the target frequency hopping spread spectrum chaotic sequence to the receiving end;
step S1006, the receiving end determines the frequency point of the received information;
step S1007, the receiving end determines to receive the increment transmission information sent by the sending end according to the frequency hopping spread spectrum chaotic sequence corresponding to the frequency point of the received information;
in an example, the receiving end receives information on a frequency point 898, a frequency point 886 and a frequency point 886 respectively, the frequency point 898 corresponds to a frequency hopping spread spectrum chaotic sequence 1, the loading information is determined to be 01, the frequency point 886 corresponds to a frequency hopping spread spectrum chaotic sequence 3, the loading information is determined to be 11, the frequency point 886 corresponds to a frequency hopping spread spectrum chaotic sequence 0, the loading information is determined to be 00, and therefore the received incremental transmission information is determined to be 01100;
step S1008, the receiving end receives the original transmission information modulated by the carrier;
step S1009, the receiving end performs carrier demodulation on the original transmission information after carrier modulation through the frequency hopping point corresponding to the incremental transmission information;
Step S1010, channel decoding is carried out on the original transmission information after carrier demodulation to obtain the original transmission information.
The chaotic spread spectrum modulation method for improving the transmission capacity of spread spectrum anti-interference communication, which is applied to a direct spread spectrum anti-interference communication system, and the chaotic spread spectrum modulation method for improving the transmission capacity of spread spectrum anti-interference communication, which are applied to a frequency hopping spread spectrum anti-interference communication system, are provided, the application scenes of the chaotic spread spectrum modulation method can be determined according to actual requirements, the chaotic spread spectrum modulation method can be used in the spread spectrum anti-interference communication system respectively, and the chaotic spread spectrum modulation method can be used in the same spread spectrum anti-interference communication system jointly, namely, the method provided by the disclosure is used for directly spreading and frequency hopping spreading original transmission information simultaneously.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It is to be understood that the invention is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (8)
1. A transmission capacity boosting method for a spread spectrum anti-interference communication system, which is applied to a transmitting end of a direct spread spectrum anti-interference communication system, the method comprising:
generating a plurality of direct spread spectrum chaotic sequences;
and based on the chaotic direct spread spectrum modulation mapping relation between the incremental transmission information and the direct spread spectrum chaotic sequences, performing chaotic spread spectrum modulation on the plurality of direct spread spectrum chaotic sequences according to the incremental transmission information, and determining a target direct spread spectrum chaotic sequence.
2. The transmission capacity boosting method for a spread spectrum interference-free communication system according to claim 1, further comprising:
determining a morphological number 2^M of each symbol based on an information amount M loaded by each symbol in the incremental transmission information;
determining the generation quantity of the direct spread chaotic sequence according to the form quantity 2^M of each code element;
and if target code element position points with the cross correlation of the spread codes larger than a preset threshold value exist in different direct spread spectrum chaotic sequences, deleting the spread codes of the target code element position points in each direct spread spectrum chaotic sequence.
3. A transmission capacity boosting method for a spread spectrum anti-interference communication system, which is applied to a receiving end of a direct spread spectrum anti-interference communication system, the method comprising:
generating a plurality of direct spread spectrum chaotic sequences;
determining a spreading code of the received information;
and determining the incremental transmission information sent by the receiving end according to the direct spread spectrum chaotic sequence corresponding to the spread spectrum code of the received information and the chaotic direct spread spectrum modulation mapping relation between the incremental transmission information and the direct spread spectrum chaotic sequence.
4. The transmission capacity boosting method for a spread spectrum anti-interference communication system according to claim 3, wherein said generating a plurality of direct spread spectrum chaotic sequences comprises:
synchronously generating a plurality of same direct spread spectrum chaotic sequences with the transmitting end;
and if target code element position points with the cross correlation of the spread codes larger than a preset threshold value exist in different direct spread spectrum chaotic sequences, deleting the spread codes of the target code element position points in each direct spread spectrum chaotic sequence.
5. The transmission capacity improving method for the spread spectrum anti-interference communication system is characterized by being applied to a transmitting end of the frequency hopping spread spectrum anti-interference communication system, and comprises the following steps:
Generating a plurality of frequency hopping spread spectrum chaotic sequences;
and based on the mapping relation of the chaos frequency hopping spread spectrum modulation between the increment transmission information and the frequency hopping spread spectrum chaos sequences, performing chaos frequency hopping modulation on the plurality of frequency hopping spread spectrum chaos sequences according to the increment transmission information, and determining a target frequency hopping spread spectrum chaos sequence.
6. The transmission capacity boosting method for a spread spectrum interference-free communication system according to claim 5, further comprising:
determining a morphological number 2^M of each symbol based on an information amount M loaded by each symbol in the incremental transmission information;
determining the generation quantity of the frequency hopping spread spectrum chaotic sequence according to the form quantity 2^M of each code element;
and if the target code element position points with the same frequency point exist in different frequency hopping spread spectrum chaotic sequences, deleting the frequency point of the target code element position point in each frequency hopping spread spectrum chaotic sequence.
7. A transmission capacity boosting method for a spread spectrum anti-interference communication system, which is applied to a receiving end of a frequency hopping spread spectrum anti-interference communication system, the method comprising:
generating a plurality of frequency hopping spread spectrum chaotic sequences;
determining a frequency point of the received information;
And determining the incremental transmission information sent by the receiving end according to the frequency hopping spread spectrum chaotic sequence corresponding to the frequency point of the received information and the chaotic frequency hopping spread spectrum modulation mapping relation between the incremental transmission information and the frequency hopping spread spectrum chaotic sequence.
8. The transmission capacity boosting method for a spread spectrum anti-interference communication system according to claim 7, wherein said generating a plurality of frequency-hopping spread spectrum chaotic sequences comprises:
synchronously generating a plurality of same frequency hopping spread spectrum chaotic sequences with the transmitting end;
and if the target code element position points with the same frequency point exist in different frequency hopping spread spectrum chaotic sequences, deleting the frequency point of the target code element position point in each frequency hopping spread spectrum chaotic sequence.
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