基本直接序列扩频系统，考虑了RAKE接收

本程序包括一组子程序和中断程序，通过S7-200自由端口功能来产生从Modbus RTU. 它支持下列Modbus功能：----1.读输出(线圈)----2.读输入(触点)----3.读保持寄存器(V 存储器).----4.读输入寄存器----5.写单路输出----6.写单路保持寄存器----15.写多路输出----16.写多路保持寄存器-this includes a subroutine and the interruption procedure for the adoption of the S7-200 free port functions to generate from the Modbus RTU. It supports the following functions : a Modbus. Reading output (2) coil. Reading input (contact)---- 3. Reading maintain registers (V memory ).---- 4. Reading input register---- 5. write single-output---- 6. write to maintain the single-route Register---- 15. write multiple output---- 16. write multiple maintain registers

引入PEG（Progressive-edge-growth）算法来构造适合线性时间编码的LDPC校验矩阵，译码时采用简化最小和Min-Sum译码算法实现简化译码．仿真结果表明，该方法能够构造适合LDPC码的线性时间编码的下三角校验矩阵日，并且用此方法构造的LDPC码性能非常接近原来PEG算法构造的LDPC码．同时通过采用最小和Min-Sum算法降低译码复杂度．-The introduction of PEG (Progressive-edge-growth) algorithm to construct suitable for linear time encoding of LDPC check matrix, decoding simplified when the smallest and the Min-Sum decoding algorithm decoding simplified. Simulation results show that this method can construct LDPC codes suitable for linear time encoding on lower triangular calibration matrix, and constructed using this method the performance of LDPC code is very close to the original PEG algorithm constructed LDPC codes. At the same time through the use of the smallest and the Min-Sum decoding algorithm to reduce complexity.

huffman and entropy approach

Visual Basic 编写生成Emial,发送Email-Visual Basic preparation generated Emial, send Email

介绍了QAM调制的星座图，对于学习QAM调制的有一定的指导意义。-Introduction of the QAM modulation constellation diagram for QAM modulation of learning have a certain significance.

一个完整的vc实现双机互连的程序，希望对大家有一定帮助。-a complete realization of a two-aircraft vc interconnection procedures, we hope to have some support.

MTP3层测试程序-ATM layer testing procedures

MATLAB下UWB仿真的信道模型,内有注释见TITLE-MATLAB simulation of UWB channel model, see the Notes within TITLE

关于基于IP通信的主流协议SIP的文档，适合SIP协议开发人员阅读。-about SIP(session initiation protocol).

Rayleigh fading channel是一种无线电信号传播环境的统计模型。这种模型假设信号通过无线信道之后，其信号幅度是随机的“衰落”，并且其包络服从瑞利分布。