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详细介绍了3G网络的发展前景和应用程度，是一本很全的知识宝典，(Details of the 3G network development prospects and application level, is a very wide knowledge of canon,)

Pleas unzip the file and put in on the workspace type deletfile to delete data files from database Note: file name should be a number. for more info type "help deletefile"

These are the code for energy detection.these code also describe about threshold,probability of detection,probability of false alarm,etc...

Calculate the Sandler s test for paired samples

说明：  认知无线电技术的提出是为提高频谱利用率，而认知无线实现的关键技术是频谱感知，众所周知协作检测提高了衰落环境中认知用户系统检测的性能，该文章是基于协作检测提出新的检测方案，利用了双门限方法提高了系统性能，兼顾带宽有限和增强性能两个方面，是基于门限检测的协作检测性能优化的前提。对以后门限优化协作检测非常有用。(In this paper, we employ a double threshold method in energy detector to perform spectrum sensing, while a fusion center in the cognitive radio network collects the local decisions and observational values of the secondary users, and then makes the final decision to determine whether the primary user is absence or not. Simulation results will show that the spectrum sensing performance channels is improved significantly under the proposed scheme as opposed to the conventional method.)

Matlab的车辆制动系统建模源代码,实例涵括面广，种类多，适用于初学者(The vehicle brake system modeling Matlab source code examples covers a wide range, variety, suitable for beginners)

Matlab的流程控制语句，掌握循环结构。 Matlab的脚本文件、函数文件编写。 Matlab脚本文件、函数文件的调试。 (Matlab flow control statements, control loop structure. Matlab script file, the function document preparation. Matlab script files, function files debugging.)

输入经度、纬度和高度，计算任意近地面的重力场(Enter the longitude, latitude and altitude, calculation of arbitrary gravitational field near the ground)

PSAT包含了：PF-潮流计算；CPF-连续潮流；OPF-最优潮流；SSSA-小扰动分析；TDS-时域仿真；GUI-用户人机界面；GNE-自定义模型等功能。该工具包已经可以计算上千节点规模的系统。而且该软件包源代码完全公开，因此用户可以根据自己的研究兴趣编写修改相应源代码实现研究目的。(PSAT includes: PF-flow calculation CPF-continuous fashion OPF-OPF SSSA-small perturbation analysis TDS-time domain simulation GUI-user machine interface GNE-custom models and other functions. The kit can have thousands of computing nodes scale systems. And the package source code is completely open, so that the user can modify the source code to write research purposes according to their research interests.)

relay node of cooperative ofdm communication