Along with the rapid development of computer technology,high speed data acquisition and storage system has been widely applied in plenty of engineering fields,such as radar,aerospace industry,communication,etc.In order to satisfy the increasing requirement,we present the design structure of a novel integrated instrument for ultra-high speed data acquisition and storage,which is composed of ultra-high speed data acquisition,high speed data transmission and solid storage three main sub-systems.The detailed design and realization of the sub-systems are presented.We test and analysis the performance of the integrated instrument and the actual results show that the instrument performs stably and provides excellent speed and precision.

关键词：通信；超高速数据采集；数据存储；数据传输；集成仪器

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This paper presents the application of the hyperbolic frequency modulated (HFM) signal to acoustic propagation in order to improve the performance of underwater acoustic (UWA) communications.Due to the large delay spread caused by multipath propagation and the severe Doppler Effect of the channel,we propose the using of double HFM signals as preambles for Doppler estimation,flame synchronization in UWA communications.A theoretical analysis about Doppler-invariability of HFM signals was provided firstly,then some numerical simulations about Doppler estimation were implemented,and experiments on testing performance of double-HFM preambles for frame synchronization in the pool were carried out as well.The simulation and experimental results show that using double-HFM signals as preambles has the capability to take an explicit Doppler estimation and retiming for frame synchronization,demonstrating that it has a good prospect in underwater acoustic communication system,especially for moving platforms.

关键词：通信；HFM信号；多普勒估计；水声通信

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Aiming at the satellite mobile communication,the cooperative communication technology is applied to the forward downlink in this paper,and one scheme with two satellites based on the coded cooperative which used the Alamouti space time block code is presented.Simulation results show the coded cooperative strategy can obtain better performance than the traditional uncoded systems,which is lower than the MIMO system with two transmit antennas and one receive antenna based on the Alamouti code,but the power of the terminal was decreased.It has the advantage in communication range and low complex mobile terminal,which has a certain application prospects in satellite mobile communications in the future.

关键词：通信；移动通信；编码协作；空时编码；Alamouti编码

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In this paper,we propose rate-compatible LDPC (RC-LDPC) codes to improve the communication system reliability for SWA communications.The proposed SWA system adopting RC-LDPC codes consists of three important preprocessing:channel state information (CSI) estimator,signal-to-noise ratio (SNR) estimator and RC-LDPC pattern.For the estimation error,we define and derive the sensitivity to imperfect CSI and imperfect SNR.Then the design of RC-LDPC codes and SWA channel profile are described.Furthermore,the RC-LDPC performance pattern is given and sensitivity to estimation error of CSI and SNR are analyzed via simulation.It is shown that RC-LDPC codes have good performances with wide range of rates in SWA channels.Finally,coding rate distributions of RC-LDPC codes in different SNR at BER below 10-4 for SWA channel are investigated.

关键词：通信；速率兼容LDPC码；浅海水声通信；水声通信

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In view of problems of limited information,dispersed storage data and single function,the paper proposed a design scheme of application management software of multimedia rescue communication system,which can coordinate with front-end device of multimedia rescue communication system to process and store rescue information real-timely,it introduced design of function modules of the software in details through analyzing design requirements of the software and gave implementing principles of technologies of multimedia information fusion and information retrieval used in the software.The actual application showed that the software has functions of video display and storage,multiparty calls,environmental parameters display and alarming,which meets with requirements of diversified information and rescue information sharing of rescue work.

关键词：通信；救援通信；多媒体信息融合；多媒体信息检索；应用管理软件

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In this paper,a fuzzy logic based energy-aware dynamic clustering technique is proposed,which increases the network lifetime in terms of LND.Here,two inputs are given in the fuzzy inference system and a node is selected as a cluster head according to the fuzzy cost (output).The main advantage of this protocol is that the optimum number of cluster is formed in every round,which is almost impossible in LEACH (low-energy adaptive clustering hierarchy).Moreover,this protocol has less computational load and complexity.The simulation result demonstrates that this approach performs better than LEACH in terms of energy saving as well as network lifetime.

关键词：通信；模糊逻辑；传感器网络；分簇协议

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In this scheme,the spectrum sensing slot is divided into four equal sub-slots.In the first and third sub-slots,the SS and SRs detect the PU by themselves.Then,in the second sub-slot,if the SRs that detect the PU during the first sub-slot are more than or equal to a prespecified quantity,the corresponding SRs will send their flag signals (FSs) to the SS while the others keep quiet,where the FS is narrowband and indicates that the PU is present.Otherwise,if the SRs that detect the PU during the first sub-slot are less than the prespecified quantity,all the SRs will keep quiet in the second sub-slot.Meanwhile,the SS detects the PU based on the received signals from the PU and SRs.And,the SS uses the same method as employed in the second sub-slot to detect the PU in the last sub-slot wherein the SRs send their FSs based on their detections made during the third sub-slot.Finally,an ultimate decision is made by the OR ruler based on the SS detection results obtained during the spectrum sensing slot. In the end,simulation and numerical results show that our proposed scheme can achieve better performance than the non-cooperative method and an existing cooperative spectrum sensing method.

关键词：通信；认知无线电网络；协作通信；频谱感知

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A distributed engine control system (DECS) offering flexibility and scalability is envisioned for the next generation of propulsion controls. Perhaps the most touted benefit of a DECS is the potential to reduce the amount of harnessing which connects throughout the engine. Such a system is comprised of several network sections incorporating control nodes or data concentrators (DCs). These DCs contain control logic to perform control function computations and are connected to the full authority digital engine control (FADEC) via a high-speed data communication bus. A novel approach for analyzing and evaluating three topologies; ring, star, and bus in the context of a relevant military engine was described. In this study, the algorithm uses a particle swarm optimization process to evolve solutions to a multi-objective optimization problem. The results of this study indicate there is potential for large wire length savings in a distributed control architecture.

关键词：通信；通信网络；推进系统；拓扑结构；军用飞机

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In UWA (underwater acoustic) communications,data rate is severely limited by the confined bandwidth source of aquatic channel.MIMO (Multiple-input Multiple-output) techniques can drastically improve the spectral efficiency,and have been a new point of reference in UWA commutations.For the estimation of UWA channel which is usually sparse,CS (compress sensing) along with STBC (space-time block code) is adopted with improved results.A design of mixing coding MIMO-OFDM is also presented in the proposed method.The validity and the dependability of this scheme are verified by Monte Carlo simulations.

关键词：通信；水声通信；空时分组编码；压缩传感；信道估计

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The fundamental theories of OFDM and WPM have many similarities in their functions and performance but there are some significant differences which give two systems to be distinctive.0FDM signals only overlap in the frequency domain while the wavelet signals overlap in both time and frequency domain.In the paper,WPM instead of conventional OFDM is used in WIMAX system.The simulation results show the WPM on WIMAX has lower bit error rate compare to conventional OFDM WIMAX.

关键词：通信；OFDM；WPM；BER

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