Design of handset software based on the J2ME in long-distance monitor system and its implementation

简要介绍了手机软件J2ME开发平台和开发工具,分析了手机远程监控的系统结构和功能实现,着重介绍了远程监控系统中基于J2ME手机客户端软件的编写,包括用户界面设计、网络连接、云台控制、图片显示几个部分的设计与实现,并给出了部分程序流程图及运行演示。This article briefly introduces the J2ME development platform and development kit for handset software,analyzes the structure and the function of handset long-distance monitor system,emphatically introduces the handset client software programming based on J2ME in long-distance monitor system,including the design and realizing of user interface,the network connection,camera control,and the picture displaying.This article also presents some flow chart diagrams and shows the result of program

Implementation of the H.264 Entropy Encoder Based on Equator BSP-16

为提高在DSP上实现的H.264编码器效率,利用Equator BSP-16处理器特有的协处理器(VLx),提出了一种并行处理熵编码(CAVLC)的方法,最终实现了CIF格式视频的实时编码。实验数据表明,该方法提高了编码器的效率,达到了较好的效果。This paper,in view of enhancing the efficiency of H.264 encoder based on DSP,uses the unique co-processor(VLx)of Equator BSP-16 processor to put forward a parallel processing method of entropy code(CAVLC),and finally reallizes the real-time encoding of CIF.The experiment results show that,this method has a good performance in enhancing the encoder efficiency.厦门市高校创新项目(3502Z0063003

Implementation of CPRI Protocol in Digital Repeater on FPGA

为了开发数字直放站连接系统,介绍CPrI协议规范和帧结构,讨论其硬件上的实现方案,给出基于SCAn25100的fPgA电路模块设计,采用VErIlOg语言设计开发功能模块。该方案具有便于功能扩展、成本低、使用灵活等特点,通过实际测试表明,此方案可进行可靠的数据传输,性能稳定,从而实现了数字直放站和基站之间更有效的互通,扩大了基站的覆盖范围。To develop the connection of digital repeaters,CPRI protocol specification and frame structure are introduced.Its implementation on hardware is discussed.The detail module design of FPGA circuit and program based on SCAN25100 are elaborated.The design is easy to expand and low cost.The experimental analysis shows that the solution could accomplish the data transmission,and the interconnection between base station and digital repeater are implemented,the network′s coverage is enhanced.福建省重大专项基金资助项目(2007HZ003

A Design of Wireless Sensor Networks Node

对无线传感器网络的特点进行了分析和总结。以低功耗、短距离多跳通信为出发点提出了系统设计思路和方法,讨论了系统设计中的关键技术和问题并给出相应的解决策略。在设计中采用了超低功耗的单片机并提出了超帧异步的通信方式。分析了系统设计上的一些问题,给出了相应的解决方法。This paper analyses and summarizes the characteristics of wireless sensor network,then presents the design scheme of the wireless sensor network node module based on low-energy consumption,multi-hop and short-haul communication.The paper expounds the system′s framework,hardware circuit selectivity,and protocol stack and surveillance software in detail.The hardware design adopts ultra-low power consumption MSP430 MCU as well as asynchronous MAC based on superframe structure.Finally the analysis by synthesis of some problems probably appeared is presented therefore the relevant strategies for resolving the problems are delivered accordingly.福建省重点科技计划项目(2005H041

基于查找表的功放数字预失真方法

对功率放大器的失真原理进行了数学分析,描述了三阶,五阶互调的产生机理。介绍了基于查找表的数字预失真的两种算法,并对算法进行了仿真,分析了算法的有效性

Design of USB host controller

讨论在SOPC(SySTEM On A PrOgrAMMAblE CHIP)系统中设计uSb主机接口设备的一般方法,着重阐述主机控制器的驱动程序开发。利用XIlInX公司的Edk软件在Ml405开发板上搭建一个基于POWErPC的片上系统,设计Ez-HOST的uSb主机控制器的lInuX驱动程序,使系统具有uSb主机功能,能够和各种uSb设备进行通信,实现SOPC系统上基于lInuX的uSb接口的扩展,对于开发其他uSb主控制器驱动具有一定借鉴意义。The general development method of USB host interface based on SoPC system is discussed,and the driver program development of host controller is introduced in detail.A PowerPC-based system on chip is built up by using Xilinx′s EDK software in the ML405 development board.Linux driver program of USB host controller of EZ-Host is designed.The system is capable of communicating with a variety of USB devices,achieves extension of the Linux-based USB interface.The design is helpful to the development of other USB host drivers.福建省重大专项项目(2007HZ0003

Wireless sensor network in American War-fighter Physiologic Status Monitoring System

单兵生命体征监测(WPSM)系统是一套基于采集、传输、存储、分析士兵生理数据的无线传感网络,它可以收集和监测包括人体的体温、脉搏、血压、呼吸、承受压力的情况、睡眠情况、身体的姿势、所能承受的工作强度等生命体征信号。同时,当士兵受伤或者极度疲劳时,它还能将士兵的状况报告给指挥官和医务兵。于是,着重讨论了WPSM中无线传感网的结构及其数据管理。War-fighter Physiologic Status Monitoring(WPSM)is a wireless sensor network that is used to collect,transmit,store and interpret physiologic data from soldiers,sailors and pilots.It can collect and monitor information regarding vital signs such as body temperature,heart rate,blood pressure,hydration and stress levels,sleep status,body position and workload capacity of the warrior.If necessary,the WPSM can notify medics and commanders if the soldier has been wounded or has become fatigued.The structure of the wireless sensor network in the WPSM and the data management of the sensor network are mainly discussed

An Efficient Timer Management Module

首先说明常见定时器管理方案的优缺点,然后针对通信协议的特点,设计了一种高效率的定时器管理模块。该模块通过使用一个辅助定时器,大大减少了定时器中断处理的时间开销。The advantages and disadvantages of common timer management programs are described.Based on the characteristics of communication protocol stack,an efficient timer management module is designed.This module greatly reduces the interrupt over head time by the use of an auxiliary timer.福建省自然科学基金项目(A0710021);重点科技计划项目(2008H0037

Complex ICA based adaptive feedback interference cancelling algorithm for wireless repeaters

为了利用自适应滤波器抵消转发与接收天线间的反馈干扰,根据卷积型混合与独立分量分析ICA解混的原理,将反馈干扰抵消问题纳入了ICA方法的框架中。针对亚高斯复值信号的特点,依据极小化互信息的准则,提出了一种基于复数ICA的自适应算法,简要分析了算法收敛的平衡点并据此给出了新的干扰抵消器的结构。计算机仿真结果表明,相比于lMS算法,所提的算法在反馈信道辨识误差以及输出信号的误差矢量幅度方面有明显的改善。Feedback interference cancelling by using adaptive filters is one of the core technologies of wireless repeaters.The problem was summed up into the framework of ICA in terms of the ICA demixing principle of convolutive mixtures.Aiming at complex signals' subgaussian feature,an adaptive algorithm based on complex ICA was proposed according to minimization of mutual information criterion.The convergence equilibrium point of the proposed algorithm was briefly analyzed and a new structure of interference canceller presented accordingly.Computer simulation demonstrated that the proposed algorithm had obvious performance improvement over conventional LMS in the identification error of feedback path and of the error vector magnitude the output signals'.国家863计划资助项目(2007AA01Z267);福建省重大专项基金资助项目(2009HZ0003-1);福建省教育厅科技项目(JA10251

Decentralized slot synchronization method for Ad Hoc networks

介绍一种用邻居节点的时隙偏差值来计算时隙调整量,从而修正节点的本地参考时隙基准的时隙互同步算法,给出了在信号传播时延情况下时隙偏差的计算方法,证明互同步算法的收敛性,最后给出不同场景下的仿真结果,并对其性能进行分析。该算法由每个节点并行协同计算,实验证明收敛速度快,平均每个节点的计算量小,非常适合于移动自组网的终端终节点运行。A time slot co-synchronization algorithm for modifying the local time slot reference is proposed,the algorithm is using the time slot deviations of neighbor nodes to calculate the slot adjustment.Then a slot deviation computing method under the condition of signal propagation delay is presented and the convergence of this algorithm is proved.Finally,the simulation results of the algorithm for different scenarios are given.Experiments show that this algorithm has fast convergence rate and less computation burden due to the parallel co-computed by each node.Hence,it is very suitable to run on Ad Hoc terminal nodes.国家自然科学基金(61001072);高等学校博士学科点专项科研基金(20100121120020);福建省科技重大专项(2009HZ0003-1);福建省自然科学基金(2010J01347)资助课