1.56822!lec2

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．)

udp协议介绍 是一个无连接的协议，快速等(udp protocol described is a connectionless protocol, fast, etc.)

automatic link establishment radio software

Effi cient Cooperative Diversity Schemes and Radio Resource Allocation for IEEE 802.16j

说明：  MIMO 信道容量的仿真 和单天线相比 多天线的信道容量仿真比较 绝对可以运行(MIMO channel capacity of the simulation and compared to single-antenna multi-antenna channel capacity can run a simulation comparing the absolute)

说明：  artificial transportation system and internet of vehicles, internet of things, vanet, intelligent transportation.

this is a paper for pcf beam splitter!

Modbus协议及Modbus RTU的C51编程(Modbus RTU Modbus protocol and the C51 programming)

基带脉冲成形数字滤波器的MATLAB设计与DSP上的实现(shaping filter and dsp realize theory )

pwm整流器的建模仿真，感应双馈发电机系统的仿真，复化三点Gauss-lengend公式求pi。( Modeling and simulation pwm rectifier Simulation of doubly fed induction generator system, Complex of three-point Gauss-lengend the Formula pi.)