对MSK信号最佳干扰效果的仿真研究

MSK是一种性能优越的新型数字调制方式，在外军的地域通信网中广泛采用。本文在对MSK信号特点进行分析的基础上，利用System View动态分析仿真平台建立用于地域通信网微波干线的MSK通信系统，对其进行干扰效果研究，并给出仿真结果。     

地域通信网干扰效果评估指标研究

目前地域通信网是战术通信网的主体和主要发展方向。介绍了地域通信网的特点,分析了对地域通信网的干扰方法。针对地域通信网的工作特性,提出了采用误码率和网络阻塞概率作为对地域网干线节点干扰的效果评估指标,最后以四个节点组成的栅格状地域通信网作为研究对象,采用数学仿真方法对多种情况下的误码率、网络阻塞概率进行了仿真评估。     

基于HLA的地域通信网通信仿真模型研究

模拟地域通信网通信,以考察评估地域通信网的稳定性为目标,基于HLA（High Level Ar-chitecture）技术对通信仿真模型的构建进行研究。在分析地域通信网模型的基础上,着重对仿真模型的结构、工作流程、FEDEP模型开发等进行了初步研究。     

基于仿真的地域通信网规划与管理

针对地域通信网在开设和维护中的需求，提出了一种基于仿真的实时规划与管理方式，将仿真系统与地域通信网中的一些节点构成半实物仿真环境。根据网络的当前状态．快速仿真网络运行，预测网络未来的性能，并持续地对网络进行优化，以此来提高地域通信网性能，改善服务质量。     

基于OPNET的地域通信网网络仿真研究

针对无线通信情况下地域通信网中心交换机节点间的通信质量,采用模块化的方法描述节点对象的行为并对节点进行建模,通过OPNET网络仿真工具对地域通信网各网络节点的仿真模型以及组成各节点的进程模块进行设计实现,结合地域通信网的一个实例,得出了节点受不同干扰情况下的全局数据业务丢包率和话音业务呼损率。     

一种基于多平台联合的地域通信网干扰仿真方法

提出了一种地域通信网干扰仿真方法——多平台联合仿真,能够全面真实地仿真地域通信网干扰各阶段、各设备的特性,仿真结果可信。     

基于SystemView的MSK通信系统仿真与分析

介绍了连续载波相位调制技术中最小移频键控（MSK）的特点,详细阐述了MSK调制解调技术的工作原理.给出了基于System View的MSK系统仿真图以及仿真输出的波形图,并对MSK系统的仿真结果进行了细致地分析.仿真结果证实了MSK技术的可行性及优越性.     

基于地域通信网流量攻击方法的仿真研究

地域通信网中各节点之间的正常通信是保障作战胜利的关键,由于地域通信网中各节点间的连接多采用无线链路,可以使用流量攻击的方法对链路进行攻击,使各节点通信中断。在分析流量控制和拥塞控制的基础上,结合OPNET仿真软件建立网络模型,通过仿真研究验证了流量攻击法可以有效地使地域通信网通信中断,达到攻击的目的。     

无人机覆盖搜索地域通信网交叉式航路规划

针对地域通信网的侦察搜索问题,提出一种以交叉式航路来实现对地域通信网部署区域完全覆盖搜索的无人机航路规划方法。首先,根据地域通信网结构特点以及干线节点天线波束特性,定性地分析得到无人机侦察干线节点时的最大侦察距离与盲区侦察距离,并分析得到无人机搜索干线节点的静态模型以及动态模型;其次,根据侦察模型,建立并优化无遗漏搜索的无人机交叉式搜索航路模型,该方法可保证搜索到地域通信网所有干线节点,并提高任务执行效率;最后,对无人机交叉搜索航路进行仿真,仿真结果表明,该方法能有效搜索到地域通信网每一个干线节点,并求解了无人机交叉式覆盖搜索航路代价。     

对地域通信网呼损的研究与仿真

本文通过对具有迂回路由的地域通信网呼损的研究与计算机仿真,得出迂回路由的存在使呼损大为降低的结论,从而增加了地域通信网的抗毁性能。     

基于深度学习的抗窄带干扰MSK非相干接收机

窄带干扰（Narrowband Interference,NBI）,作为一种敌意的频域干扰,会严重地恶化最小频移键控（Minimum Shift Keying,MSK）非相干检测的误码率（Bit Error Rate,BER）性能。为降低窄带干扰对BER性能的影响,MSK非相干接收机一般首先对接收信号进行干扰抑制。然而现有MSK非相干检测算法并未考虑干扰抑制对MSK信号造成的畸变,这制约了窄带干扰下非相干检测的MSK通信系统的BER性能。为了解决这个问题,本文提出了一种基于深度学习的MSK非相干接收机（Deep Learning-Based MSK Noncoherent Receiver,DL-MSKNCR）。该接收机包含一个干扰抑制子网络和一个MSK非相干检测子网络。通过联合训练与优化,MSK非相干检测子网络可以有效地应对干扰抑制子网络对MSK信号造成的畸变。仿真结果表明,DL-MSKNCR显著地提高了NBI下非相干检测的MSK通信系统的BER性能。      

Generalized minimum shift-keying modulation techniques

The simultaneous data demodulation and phase tracking of an MSK signal using the Viterbi algorithm is described, and two variations of MSK modulation are studied. The MSK with overlay is a dual-rate modulation techniques in which low-rate and high-rate data are superimposed on an MSK signal. Here the demodulator uses the Viterbi algorithm to estimate both the low-rate and high-rate data simultaneously. The MSK with pseudorandom sequence spreading combats intentional or unintentional jamming. A simplified receiver for these spread-spectrum MSK signals is found that takes into consideration the effect of random phase perturbations. The performance of these demodulators is evaluated using transfer-function bounds for the bit error probability. For demodulation of the spread spectrum MSK signal, a simplified receiver is derived, and its performance in the presence of continuous jamming is evaluated     

Noncoherent block demodulation of MSK with inherent and enhancedencoding

It is shown that there is a close relation between known noncoherent minimum shift keying (MSK) demodulation structures, such as envelope and differential receivers, and schemes derived from the noncoherent maximum-likelihood block estimation (N-MLBE) principle. When the observation interval is increased, the performance of MSK with N-MLBE tends to that of binary coherently detected orthogonal binary frequency shift keying. A new demodulation strategy, reduced block noncoherent estimation (RBNE), is introduced and shown to improve the performance of noncoherent MSK, beyond that of coherently detected orthogonal FSK. When RBNE is used with MSK and the observation interval is increased, the performance approaches that of antipodal signaling. The key feature of all these structures is multisymbol noncoherent processing with exploitation of the MSK inherent coding properties induced by its phase continuity. The use of binary block codes for MSK with N-MLBE is considered. It is shown that simple binary block codes with low bandwidth expansion that exploit the inherent MSK memory can give significant gains     

直扩MSK解调方法分析与仿真

根据MSK信号的特点,分析了直扩MSK信号的解调方法。基于两种可能的应用形式,在Matlab/Simulink环境下搭建了直扩MSK信号差分相干解调与包络非相干解调的仿真模型。然后进行了性能仿真。所得结论为直扩MSK信号解调的实际应用提供了参考。     

Pulse and Spectrum Manipulation in the Minimum (Frequency) Shift Keying (MSK) Format

The minimum (frequency) shift keying (MSK) format is generalized to enable further improvements in the spectrum while retaining the well-known constant envelope property and the excellent communications efficiency of MSK. A specific alternative to MSK is presented, and the spectrum is compared with that of MSK. The theoretical limitations on possible further spectrum improvements are discussed.     

声表面波32位MSK抽头延迟线

介绍了扩频通信有效的ＭＳＫ信号特点及声表面波ＭＳＫ抽头延迟线构成方式，给出了声表面波３２位ＭＳＫ抽头延迟线的实验结果。     

Error-control properties of minimum shift keying

A phase representation of minimum shift keying (MSK), which is a general framework suitable for use with other continuous phase modulation (CPM) schemes, is discussed. The representation is used to show that MSK can be viewed as a coded-modulation scheme with an expanded signal set using Ungerboeck's set partitioning concept (see IEEE Trans. Inf. Theory, vol.IT-28, no.1, p.55-67, 1982). The properties which follow from this view of MSK are explored. The uniqueness of the representation of MSK as a coded-modulation scheme and the structural relationships between different versions of MSK are described     

软件无线电中MSK调制技术的仿真研究

研究了基于软件无线电的MSK调制系统。MSK是一种典型的恒包络调制技术,有相位连续和频带利用率比较高等优点。分析了软件无线电中上变频理论、正交调制原理、NCO原理和MSK调制。利用System Generator软件对软件无线电中的MSK进行了仿真,并对仿真结果进行了分析和总结,证明此调制系统具有良好的调制性能,此方法正确、可行。     

Joint phase and timing recovery for MSK-type signals

Novel nondata-aided algorithms are proposed for joint estimation of timing and carrier phase in minimum-shift keying (MSK)-type modulations. The performance with MSK and Gaussian MSK is assessed by computer simulations and compared with that of other existing estimation schemes