Multimodal orbital angular momentum multiplexing system and method

A technology of orbital angular momentum and multiplexing communication, applied in the field of multi-modal orbital angular momentum multiplexing communication system, can solve the problems of inability, redefining the modal topological load, increasing the number of OAM modal multiplexing, etc.

Active Publication Date: 2016-11-16
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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Problems solved by technology

The common limitation of the above methods is that after the design and processing of the antenna or converter is completed, only one or several fixed OAM modes can be generated, and the modal topological load cannot be redefined by software.
However, the existing microwave OAM multiplexing theory and technical means also lead to a certain extent that the number of modal multiplexing depends entirely on the performance index of the multimode antenna.
[0007] Orbital angular momentum multiplexing transmission, the research progress in the field of optical communication is exciting (the transmission rate has exceeded 100Tbps); however, in the microwave frequency band most commonly used in wireless communication systems, this technology is still in the stage of theoretical exploration and concept verification. One of the main technical bottlenecks is the above-mentioned "limited number of modal multiplexing in the microwave frequency band", that is, in order to ensure the orthogonality between OAM modes, the multiplexed vortex electromagnetic waves usually need to be adjusted to "coaxial" (As shown in Figure 2(a), (b))
However, the method of coaxially superimposing multiple single-mode vortex electromagnetic waves through a beam splitter has poor practicability and integration, and is only suitable for millimeter waves and higher frequency bands.
At the same time, the current mainstream OAM multi-mode antennas (circular array / resonator / parabola, etc.) are limited by factors such as the number of array elements and the feed network. Therefore, it is necessary to greatly increase the number of OAM modal multiplexing, technical difficulty and cost the price is high

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Embodiment Construction

[0058] Below in conjunction with the drawings, preferred embodiments of the present invention are given and described in detail.

[0059] One of the present inventions is a multi-mode orbital angular momentum multiplexing communication system, which includes: a transmitting device and a receiving device connected by mutual communication.

[0060] Specifically, as image 3 As shown, the launcher includes:

[0061] M bit-level processing modules 101, which are used to process M channels of independent information bit streams A(n) input from the periphery in one-to-one correspondence, and generate M channels of encoded bit streams B(n), wherein, M channels The information bit stream A(n) is written as: A(n)=[a 1 (n), a 2 (n),...,a M (n)], M coded bit stream B (n) is denoted as: B (n)=[b 1 (n), b 2 (n),...,b M (n)], that is, the first bit-level processing module 101 for the first information bit stream a 1 (n) Process and generate the first coded bit stream b 1 (n); the 2...

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Abstract

The invention relates to a multimodal orbital angular momentum multiplexing system and method. The system comprises a transmitting device and a receiving device which are in mutual communication connection. The transmitting device comprises a bit level processing module, a constellation mapping module, an orbital angular momentum modulation module, a digital domain orbital angular momentum multimodal multiplexing module, a DAC module, an upper conversion module and a ring array transmitting antenna. The receiving device comprises a ring array receiving antenna, a down conversion module, an ADC module, a digital domain orbital angular momentum demodulation and demultiplexing module and a detection decoding module. According to the system and the method, a vortex electromagnetic wave multimodal OAM (Orbital Angular Momentum) multiplexing communication technology of which physical feature is clearly different from that of a traditional plane wave is realized; the spectral efficiency and the transmission rate are multiplied; and the improvement space and potential of the modal multiplexing quantity is further expanded. The system and the method can be applied to the multimodal OAM multiplexing communication system in a microwave or millimeter wave band.

Description

technical field [0001] The present invention relates to a wireless communication technology, in particular to a multi-mode orbital angular momentum multiplexing communication system and method based on digital domain coaxial multiplexing applicable to microwave and millimeter wave frequency bands. Background technique [0002] According to quantum mechanics and Maxwell's theory, the electromagnetic waves radiated by antennas have wave-particle duality, and can carry linear momentum and angular momentum like moving particles. Electromagnetic wave angular momentum includes two parts: white spin angular momentum (Spin Angular Momentum, SAM) and orbital angular momentum (Orbital Angular Momentum, OAM). Among them, SAM is related to photon rotation, which is represented by left-handed or right-handed circular polarization of electromagnetic waves. Have ( Represents the reduced Planck constant) two orthogonal states; OAM is related to the spatial distribution of the photon wav...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/548H04L27/26
CPCH04B10/548H04L27/2697
Inventor 周斌俞凯卜智勇
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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