kalman

说明：  ：载波频率偏移是OFDM系统实现的关键问题之一。分析了OFDM 系统载频偏移估计的2 种算法，即利用循环前缀和训练序列方法。它们均为最大似然估计方法。分别讨论了它们的基本 思想、实现方法和仿真结果。可以看出基于循环前缀算法复杂度较小，精度不高，而基于训练序列 的算法有较高的估计精度，但降纸了系统传输效率。(Abstract：Carrier frequency ofset is one of the key problems in OFDM system．Two foundational methods 。cycling prefix—based and training sequence—based algorithms。to estimate OFDM carriers~equency ofset are analyzed．Then it discusses their basic thoughts。implementing methods and simulation resuits． Finally。merits and demerits of every algorithm are supposed．It concludes that the cycling prefix— based algorithm has less complexity and less precision。and that the training sequence—based algorithm has better estimation performance at the cost of transmission efficiency．)

华为3G模块_EM770W_EM660资料和wince驱动(Huawei 3G module _ EM770W_EM660 data and WinCE driver)

Driving MOSFET in High-Current, Switch Mode Regulators

对当前通信信号中常用的数字调相信号BPSK、QPSK、1／4一QPSK、8PSK的调制识别问题，提出了一种基于信号差分高阶累积量的识剐算法。该算法分两个层次进行调制识别，首先利用信号的四阶累积量特征对BPSK、QPSK和{1／4一QPSK、8PSK}信号进行识别，然后再利用信号差分的四阶和八阶累积量特征对1/4-QPSK、8PSK信号进行识别。从理论上分析了的该算法的有效性，并通过计算机仿真验证了算法具有良好的性能。(A recognition algorithm based on differential high-order cumulant is proposed for the modulation recognition problems of BPSK, QPSK, 1/4-QPSK and 8PSK, which are commonly used in current communication signals. The algorithm is divided into two levels for modulation recognition. Firstly, BPSK, QPSK and {1/4-QPSK, 8PSK} signals are identified by using the fourth-order cumulant characteristics of signals, and then 1/4-QPSK and 8PSK signals are identified by using the fourth-order cumulant and eighth-order cumulant characteristics of signal difference. The validity of the algorithm is analyzed theoretically, and the good performance of the algorithm is verified by computer simulation.)

B-IFDMA pdf document

利用维特比算法解调GMSK信号 维特比算法的一个用处(Viterbi algorithm using GMSK signal demodulation Viterbi algorithm is a useful)

关于天线原理的PPT。等同于教科书。很全。(PPT of antenna principle.Can be used as teaching book. A complete one.)

NS中文手册，不用多说，有兴趣的朋友都知道。找了很久终于找到了，很不错，感谢作者辛苦努力和无私奉献！(NS Chinese manual, Needless to say, friends who are interested to know. Looking for a long time finally found, it is good to thank the author of hard work and selfless dedication!)

使用opnet与matlab实现网络编码，源码在说明文档中有下载地址(Using opnet realize network with matlab coding, source code in the description in the document have Download)

ARINC-美国航空无线电通信公司（Aeronautical Radio Inc），美国军队的长期合作伙伴。ARINC664系列协议是ARINC公司负责制定的下一代航空数据网络标准。该规范分为8个部分，从不同层次对航空数据网络标准的各个方面进行了系统的定义，形成了以AFDX技术为核心的下一代航空数据网络的完整标准。(ARINC-Aeronautical Radio Inc, the U.S. military long-term partners. ARINC664 series protocol is ARINC company is responsible for the formulation of the next generation of airborne data network standard. This specification is divided into eight parts, from different levels of airborne data network standard all aspects of the definition of the system, formed the AFDX technology at the core of the next generation of airborne data network complete standard.)