A protocol modeling method is proposed to establish the protocol's OPNET simulation model based on its ESTELLE formal description. We use processes tree in OPNET to implement the embedded module mechanism in ESTELLE, and convert ESTELLE module FSM (Finite State Machine) to OPNET process FSM. This conversion technique is illustrated by applying it to model a specific subset of the MIL-STD 188-220C protocol. Since ESTELLE is a kind of international standards about network protocol formal description language (FDL) proclaimed by ISO, our modeling method not only guarantees the concordance for each phase in protocol project, but also increases efficiency of protocol modeling.

Narrowband interference (NBI) is familiar in satellite DS/CDMA systems. Frequency domain notch filter (FDNF) based on FFT was popular due to its fast arithmetic and absence of convergence time and recursive algorithm. However, at low jammer-to-signal (JSR), the bit error rate (BER) performance degrades dramatically in comparison with the matched filter (MF) receiver of the system self. In this paper, a switching metric named compression gain (CG) was introduced to force FDNF active only after certain interference power level and MF receiver active at lower JSR. By use of CG switching metric, the algorithm overcomes the threshold effect of traditional FDNF. The advantages of the improved FDNF (IFDNF) are low computational complexity and expandability due to that the decision of the domain to be used is made before the interference suppression and the inverse transform. The IFDNF based on CG metric offers better BER performance than original FDNF at lower JSR, and also outperforms the MF receiver at higher JSR. Numerical simulation results show the proposed IFDNF overcomes the threshold effect flaw and also verify the validity of the CG parameter as a switching metric.

移动自组织网(MANET: Mobile Ad hoc Network)的研究者通常利用计算机仿真和实验床（testbed）来进行研究。这里提出了一种采用半实物仿真(HILS: Hardware in the Loop Simulation)的方法来研究 MANET 特性以及它与其他系统综合组网的仿真系统结构。通过半实物仿真可以提高仿真的精度，加速从设计到实现的进程。HILS 系统包括实物节点、仿真节点、提供仿真综合控制和调度的多任务分布式仿真平台EuroSim，以及针对高实时性要求配置的信道模拟器。作为例子，说明了在研究 MANET 组播路由技术中基于 HILS 构建的仿真框架。最后讨论了今后的扩展。

根据随机性、时间相关、空间相关、地理受限等特性对于MANET移动模型进行了分类研究，结合 3 种实际应用，包括战场环境、事件场景、参观展览，比较移动模型与之相应的特点和适用范围，研究了移动模型混合使用的可行性。利用ANSIM 工具对其中常用的几种移动性模型进行仿真试验，比较了RW、RD、GM模型对节点平均邻居数、平均跳数、节点间连通性的影响，并进行了校园区内障碍物模型下节点移动的场景模拟。

考察基于 UWB技术的 Ad Hoc网络组网的关键问题。根据 UWB信号特征分析了信道容量，说明在大带宽、 有限功率的通信模型下 UWB Ad Hoc网络的节点吞吐量。从网内冲突和网间干扰方面讨论无线接入面临的问题和解决途径，包括解决网内冲突的主从轮询机制、CS MA竞争机制和应对于网间干扰的扩频技术。举例分析了 UWB Ad Hoc网络 MAC协议的特性，说明将 Ad hoc MAC与动态信道编码结合，并采用跳时的方式解决网间干扰的是一种有效的方法。在分析 UWB和 GPS定位信息不同点的基础上进一步研究了基于 TOA的定位算法和定位辅助路由 LAR协议的原理，提出两者结合的 UWB Ad Hoc网络定位辅助路由。