This paper firstly,to the best of our knowledge,proposed two-dimensional(2D)encryption based on the Arnold transformation for implementing a secure DC-biased optical orthogonal time-frequency multiplexing(DCO-OTFM)in ...This paper firstly,to the best of our knowledge,proposed two-dimensional(2D)encryption based on the Arnold transformation for implementing a secure DC-biased optical orthogonal time-frequency multiplexing(DCO-OTFM)in optical-wireless communications(OWCs).The encrypted data is transformed to the particular 2D matrix and decrypted by the only key to get the correct information.Meanwhile,the number of keys in 2D encryption is enormous,which prevents eavesdroppers from exhaustively searching secret keys rapidly to find the right decryption.Numerical results demonstrate that the secure DCO-OTFM based on 2D encryption can effectively prevent signal decryption from the eavesdropper,which has good secure performance for applying in OWC.展开更多
This paper presents a radio optical network simulation tool(RONST)for modeling optical-wireless systems.For a typical optical and electrical chain environment,performance should be optimized concurrently before system...This paper presents a radio optical network simulation tool(RONST)for modeling optical-wireless systems.For a typical optical and electrical chain environment,performance should be optimized concurrently before system implementation.As a result,simulating such systems turns out to be a multidisciplinary problem.The governing equations are incompatible with co-simulation in the traditional environments of existing software(SW)packages.The ultra-wideband(UWB)technology is an ideal candidate for providing high-speed short-range access for wireless services.The limited wireless reach of this technology is a significant limitation.A feasible solution to the problem of extending UWB signals is to transmit these signals to endusers via optical fibers.This concept implies the need for the establishment of a dependable environment for studying such systems.Therefore,the essential novelty of the proposed SW is that it provides designers,engineers,and researchers with a dependable simulation framework that can accurately and efficiently predict and/or optimize the behavior of such systems in a single optical-electronic simulation package.Furthermore,it is supported by a strong mathematical foundation with integrated algorithms to achieve broad flexibility and low computational cost.To validate the proposed tool,RONST was deployed on an ultra-wideband over fiber(UWBoF)system.The bit error rate(BER)has been calculated over a UWBoF system,and there is good agreement between the experimental and simulated results.展开更多
The spot-diffusing technique provides better performance compared to conventional diffuse system for indoor optical-wireless communication (OWC) system. In this paper, the performance of an OW spot-diffusing communica...The spot-diffusing technique provides better performance compared to conventional diffuse system for indoor optical-wireless communication (OWC) system. In this paper, the performance of an OW spot-diffusing communication system using Neuro-Fuzzy (NF) adaptive multi-beam transmitter configuration has been proposed. The multi-beam transmitter generates multiple spots pointed in different directions, hence, forming a matrix of diffusing spots based on position of the receiver and receiver mobility. Regardless of the position of the transmitter and receiver, NF controller target the spots adaptively at the best locations and allocates optimal power to the spots and beam angle are adapted in order to achieve better signal-to-noise plus interference ratio (SNIR). Maximum ratio combining (MRC) is used in the imaging receiver. The proposed OW spot-diffusing communication system is compared with other spot-beam diffusion methods proposed in literature. Performance evaluation revels that the proposed NF based OW spot-diffusing communication system outperforms other spot-beam diffusion methods.展开更多
基金the National Key R&D Program of China(No.2018YFB1802300)the National Natural Science Foundation of China(Nos.61875076 and62005102)+3 种基金the Fundamental Research Funds for the Central Universities(No.21619309)the Leading Talents of Guangdong Province Program(No.00201502)the Natural Science Foundation of Guangdong Province(No.2019A1515011059)the Open Fund of IPOC(BUPT)(No.IPOC2019A001)。
文摘This paper firstly,to the best of our knowledge,proposed two-dimensional(2D)encryption based on the Arnold transformation for implementing a secure DC-biased optical orthogonal time-frequency multiplexing(DCO-OTFM)in optical-wireless communications(OWCs).The encrypted data is transformed to the particular 2D matrix and decrypted by the only key to get the correct information.Meanwhile,the number of keys in 2D encryption is enormous,which prevents eavesdroppers from exhaustively searching secret keys rapidly to find the right decryption.Numerical results demonstrate that the secure DCO-OTFM based on 2D encryption can effectively prevent signal decryption from the eavesdropper,which has good secure performance for applying in OWC.
文摘This paper presents a radio optical network simulation tool(RONST)for modeling optical-wireless systems.For a typical optical and electrical chain environment,performance should be optimized concurrently before system implementation.As a result,simulating such systems turns out to be a multidisciplinary problem.The governing equations are incompatible with co-simulation in the traditional environments of existing software(SW)packages.The ultra-wideband(UWB)technology is an ideal candidate for providing high-speed short-range access for wireless services.The limited wireless reach of this technology is a significant limitation.A feasible solution to the problem of extending UWB signals is to transmit these signals to endusers via optical fibers.This concept implies the need for the establishment of a dependable environment for studying such systems.Therefore,the essential novelty of the proposed SW is that it provides designers,engineers,and researchers with a dependable simulation framework that can accurately and efficiently predict and/or optimize the behavior of such systems in a single optical-electronic simulation package.Furthermore,it is supported by a strong mathematical foundation with integrated algorithms to achieve broad flexibility and low computational cost.To validate the proposed tool,RONST was deployed on an ultra-wideband over fiber(UWBoF)system.The bit error rate(BER)has been calculated over a UWBoF system,and there is good agreement between the experimental and simulated results.
文摘The spot-diffusing technique provides better performance compared to conventional diffuse system for indoor optical-wireless communication (OWC) system. In this paper, the performance of an OW spot-diffusing communication system using Neuro-Fuzzy (NF) adaptive multi-beam transmitter configuration has been proposed. The multi-beam transmitter generates multiple spots pointed in different directions, hence, forming a matrix of diffusing spots based on position of the receiver and receiver mobility. Regardless of the position of the transmitter and receiver, NF controller target the spots adaptively at the best locations and allocates optimal power to the spots and beam angle are adapted in order to achieve better signal-to-noise plus interference ratio (SNIR). Maximum ratio combining (MRC) is used in the imaging receiver. The proposed OW spot-diffusing communication system is compared with other spot-beam diffusion methods proposed in literature. Performance evaluation revels that the proposed NF based OW spot-diffusing communication system outperforms other spot-beam diffusion methods.
