Wireless Communication System Based on Vortex Electromagnetic Wave and Orthogonal Frequency Division Multiplexing
A wireless communication system, vortex electromagnetic wave technology, applied in the field of communication, can solve problems such as interference, signal fading, phase shift, etc., and achieve the effect of cost saving
Active Publication Date: 2020-06-16
XIDIAN UNIV
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In 2016, Yan Yan and others published an article in Nature, see YanY, Li L, Xie G, et al.MultipathEffects in Millimetre-Wave Wireless Communication using Orbital AngularMomentum Multiplexing[J].Scientific reports,2016,6:33482. The paper points out that multipath effects will also occur when OAM multiplexing is used for millimeter wave wireless communication, but does not propose a solution to the multipath problem
[0004] The existence of multipath will lead to the fading and phase shift of the signal, that is, when the electromagnetic wave propagates through different paths, because the time of each component field arriving at the receiving end is different, the phase superposition of each component field will be formed at the receiving end to cause interference, causing the original signal to be distorted or receive error
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[0020] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings.
[0021] Reference figure 1 , The existing multi-mode OAM system generated by a phase shifter network and a uniform circular array is composed of a transmitter and a receiver. Among them, the transmitted signal is sent to the phase shifter network after radio frequency processing through N different data links, and then sent to the N different array elements of the uniform circular array after being processed by the phase shifter network. The signals are sent by the uniform circular antenna UCA The beam is the vortex electromagnetic wave, and the receiving end de-vortexes to recover each transmitted signal. Since both the OAM mode former and the OAM mode resolver of this system use analog components, the cost is relatively high, and because the system does not consider the multipath problem in the transmission process, it will affect the re...
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The invention discloses a wireless communication system based on vortex electromagnetic waves and orthogonal frequency division multiplexing, which mainly solves the problem that the existing system cannot resist multipath. It includes a transmitting end vortex electromagnetic wave OAM pattern former (1), a transmitting end radio frequency link module (2), a uniform circular transmitting antenna array (3), a uniform circular receiving antenna array (4), and a receiving end radio frequency link Module (5) and the receiving end vortex electromagnetic wave OAM mode decomposer (6), and the transmitting end vortex electromagnetic wave OAM mode former performs IFFT operation on the input data block to generate orthogonal frequency division multiplexing OFDM modulation and generate orbit angle The mode number of momentum OAM is given to the link module and transmitted through the antenna array; the vortex electromagnetic wave OAM mode decomposer at the receiving end performs FFT operation on the received data block to realize the demodulation of orthogonal frequency division multiplexing OFDM and the decomposition of orbital angular momentum OAM Number of modes. The invention can combat the multipath effect under broadband transmission conditions.
Description
Technical field [0001] The invention belongs to the field of communication technology, and relates to a wireless communication system, which can be used for transmitting and receiving vortex electromagnetic waves generated based on a uniform circular array under multipath conditions. Background technique [0002] With the rapid growth of mobile multimedia devices and the continuous enhancement of people's requirements for real-time communication, the current spectrum resources have become overwhelmed. Vortex electromagnetic waves have received widespread attention since they were discovered because of their high spectrum utilization and anti-interference advantages. According to Maxwell's classical electromagnetic theory, momentum is a component of electromagnetic radiation, and angular momentum is a kind of momentum, which is composed of spin angular momentum SAM and orbital angular momentum OAM. Orbital angular momentum can describe the phase structure. If the number of modes ...
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IPC IPC(8): H04L27/26H04B7/0408H04B7/0413H04B1/04
CPCH04B1/04H04B7/0408H04B7/0413H04L27/2627H04L27/2649H04B2001/0408
Inventor 陈睿杨文海李建东李文刚龙汶轩
Owner XIDIAN UNIV