Wuhan Maritime Communication Research Institute

Wuhan, China

Wuhan Maritime Communication Research Institute

Wuhan, China
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Yang X.,Wuhan Maritime Communication Research Institute | Fan J.,Wuhan Maritime Communication Research Institute | Zhu F.,Wuhan Maritime Communication Research Institute
IEEE Photonics Journal | Year: 2017

This study investigates and experimentally demonstrates a novel polarization scrambling method to solve the polarization dependence of remote electro-optic modulation in the fiber-based distributed antenna system. Theoretically, if the polarization state of a monochromatic light is scrambled at a particular depth, the direct current component of the photocurrent would be independent of the polarization perturbation from the fiber link. A proof of concept experiment is performed in which a 500-MHz simulated polarization perturbation from the fiber is successfully suppressed by more than 40 dB. We then apply the proposed scrambling method to a 5-km remote electro-optic modulation fiber link and significantly reduce polarization-dependent intensity fluctuation from 42 to 0.6 dB. Furthermore, we evaluate the proposed scrambling method for remote photonic radio-frequency (RF) mixing, where the fluctuation of the converted signal is stabilized within 0.9 dB. © 2017 IEEE.


Zhou T.,Beihang University | Zhou T.,Anhui Polytechnic University | Gao Q.,Beihang University | Fei L.,Wuhan Maritime Communication Research Institute
IEEE Vehicular Technology Conference | Year: 2017

This paper analyzes the spectral efficiency of the incremental amplify-and-forward (AF) opportunistic relaying (OR) with outdated channel state information (CSI) over Rayleigh fading channels. According to the definition of distribution function, we obtain the cumulative distribution function (CDF) of the actual combined signal-to-noise ratio (SNR) received at the destination. Based on this CDF, the closed-form expression of the average spectral efficiency is derived for the incremental AF OR with outdated CSI. Numerical results show that as the average SNR of the direct link is much less than the threshold SNR, the spectral efficiency is zero, and as the average SNR is near the threshold SNR, outdated CSI deteriorates the spectral efficiency, whereas, as the average SNR is much greater than the threshold SNR, the spectral efficiency is hardly affected by outdated CSI. © 2016 IEEE.


Deng F.-S.,Wuhan University | He S.-Y.,Wuhan University | Chen H.-T.,Wuhan Maritime Communication Research Institute | Hu W.-D.,National University of Defense Technology | And 2 more authors.
IEEE Transactions on Antennas and Propagation | Year: 2010

Numerical simulation of vector wave scattering from three-dimensional (3-D) target and rough surface composite model is investigated with a 3-D multilevel UV method. Due to the adoption of RWG basis functions for accurate modeling of vector current, the oscillation of the interaction matrix elements brings difficulty to directly apply the UV decomposition method. Based on the reordering of the interaction strength and the sampling according to the characteristics distribution of the interaction, an EM- interaction-based sampling algorithm is developed for the accurate reconstruction of the far interaction submatrix with UV decomposition method. Combined with multilevel division of the total composite model, the 3-D multilevel UV method incorporating the new sampling algorithm is developed for vector wave scattering from 3-D complex target above or on a random rough surface. The 3-D multilevel UV method yields a complexity of $O(N\log N)$ for the setup time of the impedance matrix, the solve time of the matrix iterative solution and also for the memory requirements. The accuracy and the efficiency of the 3-D multilevel UV method is compared and validated with the full MOM method and the ACA method in the tested cases. Finally, the applications of a target above or on the rough surface, for example, a ship on the sea surface, have been accomplished and analyzed. © 2006 IEEE.


Pan X.,Beihang University | Xin Z.,CAS Institute of Computing Technology | Li G.,Wuhan Maritime Communication Research Institute
IEEE Transactions on Reliability | Year: 2015

The IEEE Standard 1624 provides a foundation for the assessment of organizational reliability capability (ORC). However, to better match the individual characteristics of different industries, this standard needs to be suitably clipped and adjusted, so as to develop customized models for the reliability capability evaluations of different organizations. To evaluate the ORC of China's aviation enterprises effectively, we propose a reliability engineering capability maturity model (RE-CMM) for China's aviation industry, with adequate consideration of the features closely associated with China's aviation enterprises and China's military standards. The proposed RE-CMM model is established on the theoretical basis of Capability Maturity Model Integration (CMMI), combined with the IEEE standard and China's military standards for Reliability, Maintainability, and Supportability (RMS). Structural equation modeling (SEM) is used to verify the validity of the RE-CMM model. We use a fuzzy method for the evaluation of reliability engineering capability. Detailed steps of reliability engineering capability assessment are also provided for the application of the model. Finally, a case study on a Chinese aviation enterprise is given to illustrate the model and method. © 2015 IEEE.


Liu X.,Wuhan Maritime Communication Research Institute
2011 China-Japan Joint Microwave Conference Proceedings, CJMW 2011 | Year: 2011

U-slot patch antenna with feeding and short-circuiting pins in abnormal shape is suitable for wideband (WB) and ultra wideband (UWB) systems, as well as array applications. A new WB antenna with dual-port supporting multi-band is developed by application of unique shape and perfect performance of the U-slot patch antenna in a skillful two-layer structure. The simulation result and the test model of the antenna are presented. Comparison of results between simulation and test are also provided. © 2011 CJMW.


Liu X.,Wuhan Maritime Communication Research Institute
2010 9th International Symposium on Antennas Propagation and EM Theory, ISAPE 2010 | Year: 2010

Microwave Low-profile E Shape Antenna is suitable for ultra wideband (UWB) communication system either independently or in array form. This article introduces the theory and experiment research of the UWB antenna model which can increase both of its impedance bandwidth and directional gain bandwidth. The simulation model and the test result are also presented. ©2010 IEEE.


Wu T.,Wuhan Maritime Communication Research Institute
Proceedings - 2015 IEEE 11th International Conference on ASIC, ASICON 2015 | Year: 2015

Elliptic curve point multiplication (ECPM) over prime fields has received much attention these years due to growing applications of public key cryptography. In this work we propose a parallel architecture to perform ECPM by Montgomery ladder algorithm. It consists of dual arithmetic cores carrying out pipelined modular multiplications, two-port block RAMs, the modular divider and the control unit. It can compute a 384-bit ECPM by 1.03 ms at 276 MHz in Xilinx Virtex-4 FPGA, costing 11883 slices, 26 DSPs, and 26 block RAMs(32×12). © 2015 IEEE.


Liu X.,Wuhan Maritime Communication Research Institute
2010 IEEE International Conference on Ultra-Wideband, ICUWB2010 - Proceedings | Year: 2010

Microwave U-slot patch antenna with a shorting pin is suitable for ultra wideband (UWB) communication system. This article introduces the simulation and the experiment of the UWB antenna model which increases its impedance bandwidth and gain bandwidth. The antenna bandwidth is expanded by the diversification designed for the shorting pin and the feed pin. The simulation model and the test result are also presented and the results are found in well agreement. The impedance bandwidth of the antenna is compared with that of reference [1]. The research has made big advancement in expanding antenna bandwidth. © 2010 IEEE.


Yang L.,Wuhan Maritime Communication Research Institute
Information Technology Journal | Year: 2013

In allusion to the problem of load balance, differentiated priority of service and guaranteeing the QoS performance of high priority service, a new route protocol for MANET-MDSRP (Mobile Differentiated Service Route Protocol) was proposed. MDSRP makes use of a new kind of route metric, EWDM (Expected Waiting Delay Metric). With this new metric the MDSRP can measure and evaluate the end-to-end delay of every candidate route and offer different strategies for service with different priorities. According to this mechanism, MDSRP can also balance the traffic load of networks to avoid the congestion in regional area. Analysis and simulation results had shown the feasibility and effectiveness of MDSRP.


Yuan L.,Wuhan Maritime Communication Research Institute
Proceedings - 2011 IEEE International Conference on Computer Science and Automation Engineering, CSAE 2011 | Year: 2011

Heterogeneous wireless network interconnection is one of the hot points of the current research. A novel interconnection strategy based on IP switching is put forward in this paper. The core modules are discussed seriously. And two interconnection methods, IP encapsulation and IP mapping, are proved effectiveness through the simulation results. © 2011 IEEE.

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