共查询到17条相似文献,搜索用时 78 毫秒
1.
2.
3.
4.
5.
在详细分析卷积编码GMSK调制信号的编码和调制的联合状态转移后,针对GMSK相干接收机中载波同步困难的情况,提出了存在频偏时的卷积编码GMSK调制信号载波相位和数据序列联合估计的SMLE算法.仿真结果表明:在较小频偏情况下,算法能以较好的性能完成卷积编码GMSK调制信号的非相干联合解调和译码. 相似文献
6.
文章简要介绍了JTIDS系统的原理和频段,分析了它的抗干扰性能和拦阻式干扰所需要的干扰信道数.在此基础上仿真了相关干扰和窄带噪声干扰所需要的压制系数,并分析了功率要求. 相似文献
7.
8.
根据联合战术信息分发系统(Joint Tactical Information Distribution System,JTIDS)信号的特点,提出一种基于多相滤波的JTIDS信号接收方法。该接收模型具有全概率接收JTIDS信号的特点,而且所需计算复杂度低。在信号接收后,通过能量检测对输出信号进行脉冲宽度检测,判断信号是否为JTIDS信号。仿真结果表明该方法在信噪比为正时具有较好的性能。 相似文献
9.
多点源非相干诱偏系统的射频仿真 总被引:2,自引:1,他引:1
诱偏技术是对付反辐射武器的有效手段;在分析多点源非相干诱偏理论的基础上,结合射频仿真,对多点源非相干诱饵与反辐射武器的相对位置关系进行了研究,并给出了算法,建立了模型,最后通过仿真对其进行了验证;这对射频仿真系统功能的完善、反辐射武器的抗诱偏性能评估的研究都具有重要的参考价值. 相似文献
10.
BOC调制技术在扩频通信中的应用已日趋广泛.为此,本文在对BOC调制信号的功率谱和自相关特性进行深入研究,以及将其与BPSK调制相比存在的优势进行深入分析的基础上,以BOC(10,5),BPSK(10.23)为例,进行了基于FFT的同步捕获环路的设计与仿真,并重点就不同干信比条件下两者的捕获性能进行了分析.结果表明,在一定条件下BOC调制信号具有更好的抗干扰能力,为进一步抗干扰技术的研究提供了理论基础. 相似文献
11.
In this study, a two-hop wireless sensor network with multiple relay nodes is considered where the amplify-and-forward (AF) scheme is employed. Two algorithms are presented to jointly consider interference suppression and power allocation (PA) based on the minimization of the symbol error rate (SER) criterion. A stochastic gradient (SG) algorithm is developed on the basis of the minimum-SER (MSER) criterion to jointly update the parameter vectors that allocate the power levels among the relay sensors subject to a total power constraint and the linear receiver. In addition, a conjugate gradient (CG) algorithm is developed on the basis of the SER criterion. A centralized algorithm is designed at the fusion center. Destination nodes transmit the quantized information of the PA vector to the relay nodes through a limited-feedback channel. The complexity and convergence analysis of the proposed algorithms are carried out. Simulation results show that the proposed two adaptive algorithms significantly outperform the other previously reported algorithms. 相似文献
12.
主要对Turbo均衡的原理和几种算法进行了较详尽地讨论和比较,并针对典型的无线信道,在信道参数已知的情况下,对不同的联合均衡和译码算法、不同迭代次数对系统性能的影响进行了仿真和比较,从复杂度和误码性能两方面考虑,选择适合于无线信道的Turbo均衡算法,结果表明,LCMMSE/SOVA算法在迭代几次以后具有良好的误码性能,且计算复杂度低,利于工程实现。 相似文献
13.
The probabilistic distribution of wind speed is one of the discriminating wind qualities for the assessment of wind energy potential and for the execution of wind energy conversion frameworks. The wind energy spread might be obtained when wind speed probability function is known. Thusly, the probability movement of wind speed is an uncommonly huge touch of information needed in the assessment of wind energy potential. The two-parameter Weibull circulation has been normally used, recognized and endorsed in expositive interpretation to express the wind speed repeat transport for most wind regions. The Gumbel and Frechet dissemination is frequently used to model large wind speeds. The joint probability density functions (JPDF) model is advanced by minimal disseminations of wind speed and wind direction that is expected as an Extreme-Value mathematical statement. In the present study an exertion has been made to figure out the best fitting circulation of wind speed information by a soft computing methodology. We used adaptive neuro-fuzzy inference framework (ANFIS) in this paper, which is a specific kind of the neural frameworks family, to foresee the wind speed probability density dispersion. For this reason, two parameters Weibull and JPDF and three parameter Frechet and Gumbel conveyances are fitted to data and parameters for each distribution and utilized as preparing and checking information for ANFIS model. At long last, ANFIS effects are contrasted and the four introduced appropriations recommending that ANFIS conveyances are discovered to be most suitable as contrasted with the Weibull, JPDF, Frechet and Gumbel circulations. 相似文献
14.
15.
基于MapInfo的城市物流配送信息查询系统研究 总被引:1,自引:0,他引:1
研究了城市物流配送信息查询系统.根据城市交通网络的特点,运用结点-弧段-有向线结构描述交通网络,利用动态分段技术建立了基于MapInfo的配货网络数据库.充分考虑了配货路线短、用时少,费用低的特点,提出了一种物流配送最优路径算法.采用Delphi和MapInfo集成开发方式,设计了城市物流配送信息查询系统,实现了输入查询信息或直接对地图操作来获得配货最优路线,提高了城市物流配送的便利性和高效性. 相似文献
16.
17.
基于波形匹配的星载AIS信号检测 总被引:2,自引:0,他引:2
在星载船舶信号检测的研究中,针对星载AIS系统存在时延和较大多普勒频移问题,提出了基于波形匹配的AIS信号时延频偏联合估计及其译码算法.利用AIS信号序列中的先验信息构造样本信号,通过计算并比较样本信号在不同时延和频偏下与接收信号的相关系数,估计出AIS信号的时延和频偏值,进而估计出AIS信号的码元序列.方法不需要对信号进行解调,简单易于实现.仿真结果表明,上述算法比二比特差分解调具有更好的性能,在相同信噪比下优于二比特差分解调3 dB左右,适用于存在时延和较大多普勒频偏的情况,为星载船舶信号的准确检测提供了有效方法. 相似文献