An Optimization Method of Spreading Code Balance Based on Chaotic Sequence
A technology of chaotic sequence and optimization method, applied in the field of spread spectrum communication, can solve the problems of weakening anti-interception ability and confidentiality, carrier leakage of direct-spreading system, and difficulty of balance optimization, so as to ensure anti-interception, strong anti-interception, good periodic effect
Active Publication Date: 2020-06-12
HARBIN ENG UNIV +1
View PDF2 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] Although the chaotic sequence has many advantages, it still has some shortcomings, especially its poor balance, which will lead to carrier leakage in the direct spread system (DS-CDMA), thus weakening the ability to resist interception and confidentiality
The balance coefficient of the chaotic sequence changes with the initial value, fractal parameters, code length and other parameters, which brings certain difficulties to the balance optimization
In addition, the sequence generated by a single chaotic map is easy to generate, and with the maturity of deciphering technology, it is easy to be intercepted by deciphering
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0027] A method for optimizing the balance of spreading codes based on chaotic sequences, the method inserts several chaotic sequences into the even-period m sequence whose balance coefficient is zero according to certain rules to obtain a composite sequence, and then sends the composite sequence into Matrix interleaver, the output sequence of the matrix interleaver is the final generated sequence, the specific steps are as follows:
[0028] Step 1. Generate a set of binary m-sequences, the code element of the sequence is "+1" or "-1", check the balance of the m-sequence, add a bit at the end of the sequence to an even period, so that the balance coefficient is 0, At this time, the sequence code length is M, and the number of "+1" code elements is equal to the number of "-1" code elements in the m sequence of even-numbered periods, and the number of code elements is M / 2;
[0029] Step 2. Randomly generate chaotic sequence set G 1 , the sequence set contains M / 2 groups of chao...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention belongs to the field of spread spectrum communication, in particular to an optimization method of spread spectrum code balance based on a chaotic sequence. The concrete steps of the invention are as follows: a binary m sequence of '+1'and '-1' is generated, complementing is carried out to form an even m sequence and a code length M, the initial value vector of M / 2 bit length is randomly generated, and the chaotic sequence set G1 with L code length is obtained by improved logistic chaotic mapping and binary quantization, the chaotic sequence set G2 is obtained by inverting the sequence elements in G1, the chaotic sequences in G1 and G2 are sequentially inserted into each symbol of the even m sequence, and then sent to matrix interleaver. The size of interleaver matrix is (L+1)* M, the output sequence of the interleaver is the final sequence of the present invention. The sequence generated by the invention has good balance, and the balance coefficient is always kept at zero under the code length M*( L+1), thus effectively solving the problem of carrier leakage of the direct spread system. At the same time, the sequence generated by the invention has strong confidentiality and is not prone to reversely deduce the initial value of the chaotic system.
Description
technical field [0001] The invention belongs to the field of spread spectrum communication, in particular to a method for optimizing the balance of spread spectrum codes based on chaotic sequences. Background technique [0002] Spread spectrum communication is widely used in military communication and civilian confidential communication. In the spread spectrum communication system, anti-multiple access interference, anti-multipath, anti-interception, secrecy, multiple access communication, and synchronization are closely related to the characteristics of the adopted spread spectrum code. Traditional spreading codes are mostly generated by m-sequences, and their autocorrelation is relatively ideal, but the cross-correlation function has a large peak, and the anti-multiple access performance is poor, and the correlation function has periodicity, the number of sequences with good correlation is limited, and the anti-interception performance is poor. , Confidentiality is not st...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H04J13/00
CPCH04J13/0018H04J13/0025
Inventor 薛睿熊洋程庆林王盾陈涛
Owner HARBIN ENG UNIV