嵌入式语音通信系统中VxWorksBSP的设计实现

介绍基于实时操作系统VxWorks和微处理器MPC860构建的多通道语音实时通信系统.MPC860负责完成语音通信、语音压缩、解压缩和IP封装、解封装.基于FPGA实现的通信控制器协调语音采集和回放模块同工作在QMC(多通道时分复用)模式的SCC(串行通信控制器)串口间的通信.针对实际软硬件环境定制BSP并开发了SCC串口的QMC驱动程序.     

软交换信令网关中2M高速链路的实现

本介绍了信令网关中2M高速链路的实现，其硬件平台基于MPC860QMC。讨论了MPC860QMC的配置方案及软件实现，最后给出了2M链路的测试结果。     

软交换信令网关中2M高速链路的实现

本文介绍了信令网关中2M高速链路的实现,其硬件平台基于MPC860QMC。讨论了MPC860QMC的配置方案及软件实现,最后给出了2M链路的测试结果。     

基于MPC860的嵌入式测控系统的硬件设计

本文设计的嵌入式测控系统包含模拟和数字通道，所有输入输出通道都进行了信号隔离；控制核心采用32位嵌入式通信处理器MPC860系列芯片。本文着重介绍了基于MPC860的I／O扩展和测控电路的硬件设计。     

利用MPC860实现同种局域网远程互联

文章主要介绍并提供了利用Motorola公司的通信控制器MPC860通过E1/ISDNPRA接口实现同种局域网远程互联的一种设计方案。涉及了对通信控制器MPC860的应用、以太网技术、HDLC协议以及网桥技术等。     

基于MPC860T的路由器的硬件系统设计

主要介绍了利用嵌入式处理器MPC860T实现一种低端路由器的设计方案.描述了路由器硬件系统的组成以及各个模块的功能,涉及到了对嵌入式处理器MPC860T的应用、以太网技术、HDLC协议以及E1技术等.     

MPC860T处理器在卫星通信数据业务处理中的应用

提出了一种新的基于MPC860T的卫星通信数据业务处理模块。介绍了MPC860T的内部结构和基本特性,描述了卫星通信数据业务处理模块的主要功能及其基于AT命令的工作流程,给出了MPC860T硬件平台的接口电路、存储器电路、复位和时钟电路的设计方案,分析了基于实时操作系统VxW orks软件平台的C/C 程序的实现、调试和下载过程。显示了MPC860T在通信处理方面的优越性。     

基于MPC860T的嵌入式网络平台的硬件开发

介绍了Motorola公司的嵌入式微处理器芯片MPC860T的主要性能特点,给出了以MPC860T为核心来构建用于网络通信设备开发的嵌入式网络开发平台的设计方案,同时给出了该平台的硬件结构和各主要模块的电路设计方法。     

基于以太网的话音和数据系统的实现

介绍了一种基于以太网的话音和数据通信系统的实现。该系统由一个高级终端、若干普通终端和一个以太网交换机组成。高级终端和普通终端都支持话音、非IP数据和IP数据。各种业务之间相互独立,互不干扰。终端的硬件结构基于MPC860T、DSP和FPGA,软件采用模块化设计,使用VxWorks实时多任务操作系统,采用广播技术和话音叠加实现多个终端间的电话会议功能。     

MPC860在七号信令通信网中的应用

介绍了摩托罗拉嵌入式处理器MPC860的内部结构、主要功能和性能特性。主要分析了MPC860在通信方面的优越性和先进性,包括通信处理模块、中断处理机制、七号信令的特殊使用等。描述了MPC860在七号信令通信网中的具体应用方案。对我国通信现状和七号信令的通信原理和层次结构进行了介绍。     

Full-duplex medium access control protocols in wireless networks: a survey

Medium Access Control (MAC) protocol plays an important role in full-duplex wireless networks. Theoretically, full-duplex communications have this ability to increase the capacity of traditional half-duplex wireless systems by up to twice. However, designing and implementing an efficient MAC protocol is a central issue in this way. Increasing throughput, collision avoidance, and fairness are common challenges in designing an efficient full-duplex MAC protocol. After giving a short introduction to the general classification of traditional MAC protocols, IEEE 802.11 MAC protocol, and the identified challenges of full-duplex communications in wireless networks, this review paper provides a comprehensive survey of current major MAC protocols for full-duplex wireless communications and classifies them in to three categories i.e. distributed wireless local area networks, centralized wireless local area networks, and other types of networks. This paper also explores and gives a comparative analysis of current full-duplex MAC protocols with stating their advantages and disadvantages as well as comparing them one with another.

     

基于GSPN的局域网随机访问协议的分析方法

对局域网随机访问协议进行了简单描述，对局域网上两个站点随机访问信道的通信过程建立GSPN模型，求解出相应性能参数。通过对运算结果进行分析，验证了该方法的有效性，模型的准确性和直观性为分析通信协议效能提供新的思路。     

基于Nucleus PLUS系统的TD-LTE射频一致性测试仪的实现

为满足通信软件设计中实时性和可靠性的需求,提出了一种长期演进终端协议栈通信软件的实现方案.本文重点介绍了Nucleus PLUS实时多任务操作系统的主要组件及其相关功能,并论述了系统实现过程中硬件平台搭建的实现方法及协议栈的实现机制.实际测试表明,基于Nucleus PLUS操作系统的射频一致性测试仪确保了通信的实时性和可靠性,该实现方案可应用于类似通信软件的开发过程中.     

基于PCL的3GPP-AKA协议的形式化分析与证明

3GPP-AKA协议在第三代移动通信的安全性方面起着至关重要的作用,它保证了移动用户MS与VLR/HLR之间的双向认证及密钥协商.文中通过协议组合逻辑(PCL)对3GPP-AKA协议进行了形式化分析及安全性证明.分析表明3GPP-AKA协议可以满足它的安全目标,因此该协议可以安全的作为第三代移动通信中的认证和密钥分配协议.     

宽带载波电力线通信协议中信道交织的FPGA实现

介绍了宽带载波电力线通信协议中用到的信道交织。在此协议的基础上,提出了基于FPGA信道交织模块的设计方案。文中对信道交织的物理层实现方法进行了介绍,该方法是通过ROM读操作和RAM的读写操作来实现信道交织过程,较好地满足了资源和时延的双重要求。     

Deterministic K‐means secure coverage clustering with periodic authentication for wireless sensor networks

Innovative and emerging developments in sensor networks are proven to be the backbone for real‐time applications such as satellite communications, military and border area surveillance systems, health care systems, traffic monitoring systems, seismic and underwater monitoring systems, and agriculture and habitat environment systems. Coverage and clustering techniques enable the sensor network to operate in group‐based and region‐based communication and thus save the node energy. Energy‐efficient protocols save the node energy and increase the network life cycle in a resource‐constrained sensor network. Cluster head (CH) node manages and controls the operations such as network topology, coverage area, and routing paths (multi‐paths and fault‐tolerant paths) of the network. In this paper, we present deterministic K‐means secure coverage clustering (K‐SCC) with periodic authentication. The proposed protocol uses coverage clustering technique with periodic authentication between the CH node and sensor nodes to establish the secure channel in the network. Maximum cover of K nodes is maintained in the secure coverage cluster to achieve authenticated communication between the sensor nodes in the network. The proposed K‐SCC protocol is compared with the existing protocols such as deterministic‐SCC and random‐SCC protocols. Simulation results indicate that the proposed K‐SCC protocol achieves an average of 84% coverage ratio (cluster/sensor node ratio) as compared with 62% coverage ratio in the existing SCC protocols. Simulations also indicate that the proposed K‐SCC protocol consumes 20% less energy as compared with the existing SCC protocol. Copyright © 2015 John Wiley & Sons, Ltd.     

Polling deregistration for unlicensed PCS

The FCC has allocated the spectrum between 1850-1910 and 1930-1990 MHz for licensed personal communications services (PCS) and the band between 1920-1930 MHz for unlicensed PCS (UPCS). This paper describes a polling deregistration protocol for a wireless access communications network which would support interoperability between licensed personal communications services (PCS) and unlicensed-PCS (UPCS). We show how the protocol can be efficiently implemented in the personal access communications system (PACS) for licensed PCS and in the PACS-Unlicensed Version B (PACS-UB). An analytical model is proposed to analyze the performance of the polling protocol. A cost function is derived, which can be used to estimate the optimal polling frequency     

基于QMCPF-IMM的强机动目标跟踪算法研究

为了提高雷达对机动目标的跟踪精度,通过融合拟蒙特卡罗思想,提出了一种适用于非线性非高斯系统的拟蒙特卡罗粒子滤波交互式多模型算法。该算法利用拟蒙特卡罗采样,克服传统算法采样粒子间隙过大、粒子层叠问题,增加交互式多模型对机动目标跟踪时的有效粒子数;通过区间估计理论,解决拟蒙特卡罗支撑区间难以计算问题,并结合核密度估计重采样,保证采样粒子的低等差异性。仿真结果表明：与交互式多模粒子滤波算法相比,改进算法可在保证滤波实时性的同时,提高跟踪精度。     

Novel MAC protocol for terahertz ultra-high data-rate wireless networks

Due to having a large bandwidth to support Gbps-level data rate, terahertz communication attracts more and more attention in recent years. However, there are few medium access control （MAC） protocols for terahertz ultra-high data-rate wireless networks, which affects the research and application of terahertz communications. To address this problem and to achieve ultra-high data-rate wireless access with terahertz communication, a novel MAC protocol, called medium access control for terahertz communication （MAC-TC）, is proposed. Through designing a new channel access scheme, a new superframe structure, and related key parameters, MAC-TC can support a maximum data rate up to 10 Gbit/s even higher. Theoretical analysis and simulation results show that our proposed MAC protocol realizes the function of medium access control and attains a maximum data rate of 18.3 Gbit/s, which is 2 times higher than 5.78 Gbit/s, the theoretical maximum data rate of IEEE 802.15.3c standard.     

An improved mutual authentication protocol based on perfect forward secrecy for satellite communications

As the mobile network progresses fast, mobile communications have a far‐reaching influence in our daily life. In order to guarantee the communication security, a myriad of experts introduced many authentication protocols. Recently, Qi et al presented an enhanced authentication with key agreement protocol for satellite communications, and they proclaimed that their protocol could defend various attacks and support varied security requirements. Regrettably, in this paper, we prove that their protocol was fruitless in resisting smart card stolen or loss attack, supporting perfect forward secrecy and had a fundamental error. To solve these problems, we present an improved protocol based on perfect forward secrecy. In addition, the analysis of our improved protocol suggests that it gets possession of faultless security properties and overcomes the flaws in the protocol of Qi et al perfectly. Thus, our improved protocol can be appropriated for the mobile communications.