Orbital angular momentum electromagnetic wave multiplexing communication system and method for axial convergence reception
An orbital angular momentum and multiplexing communication technology, applied in the field of orbital angular momentum electromagnetic wave multiplexing communication systems, can solve the problems of limiting the transmission rate and crosstalk of the OAM-MDM system, achieve convenient and effective implementation, reduce hardware overhead, and improve errors. The effect of code performance
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no. 1 example
[0074] This example describes in detail how the transmitting end generates multi-mode multiplexing OAM through intermediate frequency processing, and the process of realizing demultiplexing separation and energy aggregation of multiple OAM signals at the receiving end.
[0075] This example designs a kind of transmitting antenna module 104 that is suitable for producing a plurality of independent different mode OAM electromagnetic waves, as image 3 In the shown xyz coordinate system, the transmitting antenna module 104 is a loop antenna array, and the radii of the loop antenna arrays are different, and different OAMs generated may have the same or different radio frequency beam divergence angles. Such as figure 2 As shown, the encoding and modulation module at the transmitting end can generate two bit information sequences of the same length, using QPSK (Quadrature Phase Shift Keying) modulation mode, and each two binary information bits represent a phase of four carrier pha...
no. 2 example
[0085] As mentioned above, if the same-frequency OAM electromagnetic waves of different modes carry different information sequences, it is only necessary to place receiving antennas at the corresponding energy focus positions to achieve separate reception of different information sequences. The receiving antenna module 202 is correspondingly connected to the radio frequency link module 203 of the receiving end, and the received signal is transmitted to the data demodulation output module 204 after being down-converted. the spectral efficiency. In the following, two bit information sequences are taken as an example for illustration. Such as Figure 4 As shown, the compound angle converging lens module 201 is made and processed with HDPE material, the OAM spiral phase plate with the mode number of 0 is in the middle, and the converging electromagnetic lens is used at the back, and the focal length is 0.15m. The outer ring is a spiral phase plate with a mode number of 1, and th...
no. 3 example
[0092] Further, two different bit data sequences are respectively modulated onto a 10GHz carrier, and two OAM signals with modal numbers of 0 and 1 are coaxially multiplexed and transmitted through the transmitting antenna module 104 in the present invention, and then Two different omnidirectional antenna elements are placed at the positions of 0.15m and 0.3m away from the compound angle converging lens module 201 in the axial direction of the transmission axis of the receiving end to receive two OAM signals of different modes. The experimental results are as follows Figure 5 shown. Its abscissa is the signal-to-noise ratio (SNR), in dB, and its ordinate is the bit error probability (BER), from Figure 5It can be seen from the figure that the curves of “demodulation after demultiplexing of 2-channel simultaneous interpretation (OAM=0)” and “demodulation after demultiplexing of 2-channel simultaneous interpretation (OAM=1)” represent the difference between the two energy aggre...
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