Directional modulation method and system based on extended weighted fractional Fourier transform
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A fractional Fourier, directional modulation technology, applied in secure communication, electrical components, etc., can solve problems such as interception by eavesdroppers and large communicable area
Active Publication Date: 2021-09-10
HARBIN INST OF TECH
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[0004] The purpose of the present invention is to solve the problem of being easily intercepted by eavesdroppers due to the large communicable area in space in th
Method used
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specific Embodiment approach 1
[0032] Specific implementation mode 1. Combination figure 1 with figure 2 This embodiment will be described. A directional modulation method based on extended weighted fractional Fourier transform described in this embodiment, the method specifically includes the following steps:
[0033] Step 1. Perform baseband constellation mapping on the 0 and 1 bit data generated by the information source to obtain the modulated signal X after constellation mapping;
[0034] Step 2. Perform extended weighted fractional Fourier transform multi-component generation on the modulated signal X obtained in step 1 to obtain four serial digital signals F l 0 , F l 0 Represents the lth serial digital signal obtained, l=0,1,2,3;
[0035]
[0036] In the formula, X l is the result of performing l-time Fourier transform on the signal X, i is the imaginary number unit, Transform parameters generated for multicomponent Extended Weighted Fractional Fourier Transform, k=0,1,2,3,
[0037] ...
specific Embodiment approach 2
[0057] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in the step 6, the four analog modulation signals obtained in the step 5 are respectively Perform up-conversion processing to obtain four signals after up-conversion processing; the specific process is:
[0058]
[0059] In the formula, Represents the l-th signal after up-conversion processing, f c is the carrier modulation center frequency, t is the timing mark, Re[·] represents the real part, and e represents the base of the natural logarithm.
specific Embodiment approach 3
[0060] Specific embodiment three: the difference between this embodiment and specific embodiment two is that in the step seven, the receiving end receives the signal through a single antenna, and the signal received by the receiving end is in the form of:
[0061]
[0062] In the formula, Y R1 is the signal received by the receiver, H l is the channel state information matrix of the l-th channel signal after up-conversion processing, N T is random noise.
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Abstract
The invention discloses a directional modulation method and system based on extended weighted fractional Fourier transform, and belongs to the technical field of wireless communication. The problem that in an existing directional modulation security scheme, due to the fact that the communication area in the space is large, the communication area is easily intercepted by an eavesdropper is solved. According to the method, the self-interference characteristic of multiple components of the extended weighted fractional Fourier transform and the frequency control array are utilized, so that an anti-interception signal form with distance correlation and deviation angle correlation characteristics and a controllable communication area design can be realized. According to the method disclosed by the invention, a low bit error rate region in a space is greatly reduced, and in a network with an eavesdropper, even if related knowledge of fractional domain transformation is public and all transformation parameters can be brute-force cracked through the cost of paying higher calculation complexity, high-probability interception of signals cannot be realized. The security performance of the physical layer of the hybrid carrier system is enhanced, and the confidentiality of communication is guaranteed. The method can be applied to the technical field of wireless communication.
Description
technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a directional modulation method and system based on extended weighted fractional Fourier transform. Background technique [0002] With the vigorous development of information and communication technology, people have a higher demand for the security performance of communication, and the theory and technology of information security have attracted extensive attention. With the development of technology and the deepening of research, physical layer security technology, as an effective supplement to the upper layer encryption system, has been more and more researched because of its unique advantages in enhancing system security performance. In recent years, the weighted fractional Fourier transform has been gradually researched and applied in communication systems, and has also been applied to various research fields of physical layer security, and has ach...
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