信息论与编码系列课程教学研究

我校针对本科生、硕士研究生和博士研究生开设了信息论与编码系列课程。笔者结合从事该系列课程教学的体会,提出了针对不同层次学生设计教学内容和教学重点的方案:对于本科生,注重阐述基本编译码思想和实际工程应用,以便指导今后的继续学习和工作;对于研究生,则更侧重于编码理论、物理意义解释以及具体算法推演,为进一步深入研究奠定基础。实践证明获得了很好的教学效果。     

测控通信网管系统中故障监测模块的设计与实现

针对测控通信网的特殊设备和环境,设计了综合网络管理系统的总体结构,并着重分析了故障监测模块。故障监测采用SNMP网络管理体系中的告警引导轮询方法实现,既保证了故障的完全检测,又减轻了网络负担。     

基于FPGA的FIR滤波器设计与实现

微电子技术和计算机技术的飞速发展，使得现代电子系统的设计和应用进入一个全新的时代，基于FPGA的数字系统设计在现代电子系统的设计和应用中占据了越来越重要的作用。FPGA芯片由底层可编程硬件单元、Block Ram资源、布线资源、可配置I／O单元及时钟资源等构成。底层可编程硬件单元一般由触发器(FF)和查找表(LUT)组成，FPGA规模大、频率高，寄存器、触发器资源多，在现代数字系统中比较适合实时性要求高、频率快的系统。     

基于MSMSE的MIMO放大转发双向中继信道中波束成形设计

本文主要研究了基于最小化均方误差和准则的MIMO放大转发双向中继信道中的波束成形向量(矩阵)的设计.我们分别在集中式与分布式两种应用环境中提出了一套解决方案.在集中式方案中,多个中继之间完全协作,因此将多个单天线中继等效成一个多天线的中继节点,设计了基于所有中继天线的总功率控制的波束成形向量(矩阵).在分布式方案中,中继节点之间无协作,分别设计了基于所有中继总功率控制波束成形向量(矩阵)和基于单个中继功率控制的波束成形向量(矩阵).仿真表明,通过波束成形设计,可以显著提高通信节点平均误码率.由于中继节点之间的完全协作,集中式方案要优于分布式方案.但是,由于中继结构简单,分布式方案更易于在实践中应用.     

拥有多天线源节点的放大转发双向中继信道机会中继策略研究

We consider a two-way relay network where the Amplify-and-Forward (AF) protocol is adopted by all relays in this paper. The network consists of two multi-antenna source nodes and multiple distributed single-antenna relays. Two opportunistic relaying schemes are proposed to efficiently utilize the antennas of the source nodes and the relay nodes. In the first scheme, the best relay is selected out by a max-min-max criterion before transmitting. After that, at each source, only the antenna with the largest channel gain between itself and the best relay is activated to transmit and receive signals with full power. In the second scheme, assisted by the best relay which is selected by the typical max-min criterion, both source nodes use all their antennas to exchange data, and match filter beamforming techniques are employed at both source nodes. Further analyses show that all schemes can achieve the full diversity order, and the conclusions are not only mathematically demonstrated but numerically illustrated. System performance comparisons are carried out by numerical methods in terms of rate sum and outage probability, respectively. The beamforming assisted scheme can be found to be superior to the antenna selection scheme when accurate Channel State Information (CSI) is available at the transmitters. Otherwise, the latter is very suitable.