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asd
航空航天通信技术一般采用模拟通信的频率调制和数字通信的移相键控调制方法。这有利于充分应用信道带宽和能源。频率调制是在一定程度上改变载波或副载波的频率来传输信息的调制方法。移相键控调制是利用载波或副载波的相位跳变来传输信息的调制方法。移相键控又分二相移相键控、四相移相键控和多相移相键控，其中以四相移相键控和八相移相键控调制方法的效率较高(Aerospace communications technology commonly used analog communication of frequency modulation and the digital communication phase shift keying modulation method. This is helpful for making full use of channel bandwidth and energy. Frequency modulation is changed to some extent carrier or subcarrier frequency to transmit information modulation method. Phase shift keying modulation is the use of carrier or subcarrier phase jump to transmit information modulation method. Phase shift keying and binary phase shift keying, four phase shift keying and multiple phase shift keying, of which four phase shift keying and eight phase shift keying modulation method of high efficiency
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- 2011-07-13 11:21:08下载
- 积分：1
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time_frequency
这是一篇现代通信原理课程的作业报告.题目为几种时频分析方法比较及应用.详细介绍了短时傅里叶变换、小波变换、魏格纳—威利分布和Cohen类时频分布这4种典型时频分析方法,并作了比较(This is a modern communication Principle operating report. Entitled Comparison of several time-frequency analysis and 应用. 详细 Jieshao the short time Fourier transform, wavelet transform, Wigner- Willie distribution and frequency distribution of Cohen Lei This four kinds of typical time-frequency analysis method, and compared)
- 2010-07-12 22:12:25下载
- 积分：1
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jiugongwenti
（九宫问题）在一个３×３的九宫中有１－８这８个数及一个空格随机的摆放在其中的格子里，如图１－１所示。现在要求实现这个问题：将该九宫格调整为如图１－１右图所示的形式。调整的规则是：每次只能将与空格（上、下、或左、右）相邻的一个数字平移到空格中。试编程实现这一问题的求解。((Nine-palace issues) in a 3 × 3 of the Nine-palace are 1-8 this 8 random number and the placing of a space in which the cell house, as shown in Figure 1-1. Now required to achieve this issue: the squares adjustment for the right as shown in Figure 1-1 form. Adjustment of the rules: each can only be with the spaces (upper and lower, or left, right) adjacent to a digital flat space. Test Programming to solve this problem.)
- 2008-12-25 22:07:50下载
- 积分：1
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OWH001102-UMG89000-hardware-introduction-ISSUE1
Huawei UMG89000 hardware introduction ISSUE1.1
- 2011-05-03 22:23:59下载
- 积分：1
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qing_ww44
插值与拟合，解方程，数据分析，包含收发两个客户端程序，三相光伏逆变并网的仿真。( Interpolation and fitting, solution of equations, data analysis, Transceiver contains two client programs, Three-phase photovoltaic inverter and network simulation.)
- 2017-04-20 14:20:09下载
- 积分：1
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Ultrahigh-Speed-OTDM-Transmission
文章涉及OTDM系统的实现，对研究此方向的同学有一定帮助(OTDM systems involved in the realization of the article, students in this direction of research will definitely help)
- 2011-05-09 15:23:46下载
- 积分：1
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7348
三相光伏逆变并网的仿真，STM32制作的MP3的全部资料，IMC-PID是利用内模控制原理来对PID参数进行计算。( Three-phase photovoltaic inverter and network simulation, STM32 all the information produced by the MP3, The IMC- PID is using the internal model control principle for PID parameters is calculated.)
- 2017-05-06 10:54:41下载
- 积分：1
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OFDM(matlab)
OFDM上下行的链路仿真，很简单，解释的也很清楚，易懂(simulink ofdm,easy)
- 2012-04-20 15:38:55下载
- 积分：1
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DirectedDiffusion
this describe the rouring protocol direct diffusion for wireless sensor network
- 2010-02-09 14:38:45下载
- 积分：1
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technology-Bluetooth-wireless
关于蓝牙的设计
基于蓝牙技术的无线数据采集系统(The design is based on Bluetooth technology Bluetooth wireless data acquisition system)
- 2011-06-23 20:48:51下载
- 积分：1
