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Chaotic‐Maps‐Based Hash Function and Its Application
Yanzhang Pan,Minglu Jin,Junrong Gu 한국어정보학회 2007 한국어정보학 Vol.9 No.1
A new hash algorithm with private key is proposed based on chaotic‐mapping, by reshaping a piece‐wise linear chaotic mapping. This algorithm based on the cipher block chain mode makes the iteration initial point as the private key, encrypts arbitrary length plaintext data to 128 bits hash value. The proposed algorithm encrypts multi‐bit at one time, which reduces the chaotic iterating times and improves the encryption speed. Through theoretical analysis and simulation results, the proposed hash function could satisfy the requirements of unidirectionality, initial value and key sensitivity, anti‐collision and real time, which could be applied to the identity authentication conveniently, safely and efficiently.
Directional antenna based Hybrid-CCC-CR-AODV routing protocol for Cognitive Radio Ad-Hoc Networks
Satish Anamalamudi,Minglu Jin,Jae Moung Kim 한국정보통신학회 2015 2016 INTERNATIONAL CONFERENCE Vol.7 No.1
End-to-end application throughput, network power consumption and routing control overhead at network layer of Cognitive Radio Ad-Hoc Networks (CRAHNs) is mainly based on common control channel. Hence, reliable and robust CCC design for CR-AODV routing protocol is utmost important to provide shortest end-to-end channel-path and reduced node, network power consumption. State-of-the-art CR-AODV routing protocols propose In-band or Out-of-band CCC design for routing and cognitive control message exchange. But, multichannel hidden terminals, longer end-to-end channel-path and increased channel rendezvous time results in additional routing and cognitive control overhead with longer end-to-end delays and increased node power consumption. To evade this, we propose Directional antenna based Hybrid-CCC-CR-AODV routing protocol with adaptive power control algorithm for CRAHNs. Experimental results reveal that proposed Directional antenna based Hybrid-CCC-CR-AODV routing protocol has decreased routing and cognitive control overhead with increased end-to-end application throughput when compared with Omnidirectional antenna based In-band/Out-of-band CCC-CR-AODV routing protocols.
Laser Spot Detection Using Robust Dictionary Construction and Update
Wang, Zhihua,Piao, Yongri,Jin, Minglu The Korea Institute of Information and Commucation 2015 Journal of information and communication convergen Vol.13 No.1
In laser pointer interaction systems, laser spot detection is one of the most important technologies, and most of the challenges in this area are related to the varying backgrounds, and the real-time performance of the interaction system. In this paper, we present a robust dictionary construction and update algorithm based on a sparse model of background subtraction. In order to control dynamic backgrounds, first, we determine whether there is a change in the backgrounds; if this is true, the new background can be directly added to the dictionary configurations; otherwise, we run an online cumulative average on the backgrounds to update the dictionary. The proposed dictionary construction and update algorithm for laser spot detection, is robust to the varying backgrounds and noises, and can be implemented in real time. A large number of experimental results have confirmed the superior performance of the proposed method in terms of the detection error and real-time implementation.
Optimal Transceiver Design for Interference Alignment Based Cognitive Radio Networks
Hongzhi Men,Nan Zhao,Minglu Jin,Jae Moung Kim IEEE 2015 IEEE communications letters Vol.19 No.8
<P>Interference alignment (IA) can effectively eliminate the interference among users in cognitive radio (CR) networks. Nevertheless, to further increase the transmission rate of the primary user (PU) and guarantee its priority, we propose an optimal transceiver design (OTD) scheme for IA-based CR networks in this letter. In the OTD scheme, two partial-IA based algorithms are proposed to design the precoding matrices of SUs, in which the interference is aligned at the primary receiver with much lower overhead and complexity. Then the PU's precoding matrix is designed to maximize its throughput accordingly. To further improve the performance of SUs, their decoding matrices are re-designed. Simulation results are presented to show the effectiveness of the proposed scheme.</P>
Enhanced Spatial Modulation of Indoor Visible Light Communication
Shan, Ye,Li, Ming,Jin, Minglu The Korea Institute of Information and Commucation 2015 Journal of information and communication convergen Vol.13 No.1
In this study, we consider visible light communication in an indoor line-of-sight environment. It has been proved that among the multiple input multiple output (MIMO) techniques, spatial modulation (SM) performs better than repetition coding (RC) and spatial multiplexing (SMP). On the basis of a combination of SM and pulse amplitude modulation (PAM), here, we propose an enhanced SM algorithm to improve the bit error rate. Traditional SM activates only one light-emitting diode (LED) at one time, and the proposed enhanced SM activates two LEDs at one time and reduces the intensity levels of PAM by half. Under the condition of a highly correlated channel, power imbalance is used to improve the algorithm performance. The comparison between the two schemes is implemented at the same signal-to-noise ratio. The simulation results illustrate that the enhanced SM outperforms the traditional SM in both highly correlated and lowly correlated channels. Furthermore, the proposed enhanced SM scheme can increase the transmission rate in most cases.