High-dimensional digital signal coding and decoding method and system based on multicyclic vortex beam
A codec method and vortex beam technology, which are applied in the field of high-dimensional digital signal codec method and system, can solve the problems of increased detection range, complicated technology, difficult implementation, etc., and achieve simple structure, improved coding efficiency, and easy adjustment Effect
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Embodiment 1
[0047] Embodiment 1: Free space transmission of 5000 random 64 code elements
[0048] In this embodiment, 5000 64-ary numbers are randomly generated, and the transmitter passes through 16 OAM states (l=-9,-8,-7,-6,-4,-3,-2,-1, 1, 2, 3, 4, 6, 7, 8, 9) and 4 radial quantum numbers (p = 0, 1, 2, 3) for 6-bit multi-ring vortex beam encoding, the total amount of information after encoding is 30 kilobits. After being transmitted in free space, it is received and decoded by the receiver. The decoded 5000 hexadecimal numbers are exactly the same as the 5000 random hexadecimal numbers encoded by the transmitter, and the bit error rate is 0.
Embodiment 2
[0049] Example 2: Free-space transmission of 64×64 grayscale images
[0050] In this embodiment, a grayscale image is transmitted in free space by using the same 6-bit multi-ring vortex beam coding as in Embodiment 1. The selected grayscale image is a 64×64 pixel Beijing Institute of Technology logo, and the image size is 32.768 kilobits. Figure 6(a) and Figure 6(b) respectively show the grayscale picture encoded and transmitted by the transmitter and the picture decoded by the receiver after transmission in free space using 6-bit multi-ring vortex beam encoding. The experimental results show that the bit error rate of grayscale pictures transmitted by 6-bit multi-ring vortex beam coding transmission is 0, and the pictures demodulated by the receiver after transmission are exactly the same as those coded and modulated by the transmitter.
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