chengxu

说明：  关于Z变换的各种例子 帮助我们较为简单的学习 取得较快的进步(About Z transform of a variety of examples to help us study a relatively simple rapid progress)

设计一种基于Matlab的PID控制器，利用仿真功能验证其合理性(Designed a Matlab based on the PID controller, the use of simulation to verify its reasonableness)

red and wred algorithms in matlab for networking

OFDM 通信系统仿真，包括 BPSK QAM QPSK 调制程序，和解调程序，(OFDM communication system simulation, for BPSK QAM QPSK modulation, and demodulation process,)

Sametime software zip

A black body is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence.Black-body radiation is distributed in energy (or frequency) in a manner set by the temperature T. A black body in thermal equilibrium emits electromagnetic radiation called black-body radiation. The radiation is emitted according to Planck s law, meaning that it has a spectrum that is determined by the temperature alone (see figure at right), not by the body s shape or composition. Practical materials emit energy at a fraction of black-body energy levels called the emissivity of the surface. By definition, a black body in thermal equilibrium has an emissivity of ε = 1.0. A source with lower emissivity independent of frequency often is referred to as a gray body. Construction of black bodies with emissivity as close to one as possible remains a topic of current interest. This code can be used to simulate the black body radiation.

这本书详细地描述了UML统一建模语言，对使用者有很好的导向作用 (This book describes in detail the UML Unified Modeling Language, the user has a good guide)

matlab guide ,用户手册，，，很好很全的资料。。。。(matlab guide ,用户手册，)

该程序主要实现了使用高斯脉冲成形脉冲对OFDM信号进行成形。并对其在AWGN信道下的误码性能进行了测试，对从事4G、5G研究的科研工作者很有好处。(This manusript uses the Gaussian pulse to shaping the OFDM system, ad test the BER performance in AWGN channel, its very helpful for who work in the 4G and 5G communication technology.)

Stop-and-wait ARQ is a method used in telecommunications to send information between two connected devices. It ensures that information is not lost due to dropped packets and that packets are received in the correct order. It is the simplest kind of automatic repeat-request (ARQ) method. A stop-and-wait ARQ sender sends one frame at a time it is a special case of the general sliding window protocol with both transmit and receive window sizes equal to 1. After sending each frame, the sender doesn t send any further frames until it receives an acknowledgement (ACK) signal. After receiving a good frame, the receiver sends an ACK. If the ACK does not reach the sender before a certain time, known as the timeout, the sender sends the same frame again.