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matlab Simulation program to realize QPSK transmission system

利用超大规模集成电路技术实现高精度的A/D转换器通常采用过采样技术，该技术包括调制器和数字滤波两部分。(The use of VLSI technology to achieve high-precision A/D converters typically using oversampling technique including modulator and digital filter in two parts.)

地震波数值模拟 该程序为地震波数值模拟程序，基于声波方程高阶有限差分格式，程序中参数已经进行了说明，对于初学地震波数值模拟的朋友很有帮助。该程序为matlab编制，可以直接进行成图，所得图形为波场快照。(Seismic wave numerical simulation)

MIT matlab麻省理工學院MATLAB使用指南。(MIT MIT Matlab using MATLAB Guide.)

提取电离层TEC的数据，对于各个纬度只要修改值就可以(Extraction of ionospheric TEC data, for each latitude as long as the modified value can be)

可以把mat格式的数据集转变为txt格式用来分类的文件。(You can format the data into a set of mat txt format used to classify documents.)

用于计算相机外参数，即CCD像素坐标与三维世界坐标的对应关系，输入参数是世界坐标标定点对，输出外参数矩阵(Outside the parameters used to calculate the camera, that the correspondence between CCD pixel coordinates and the coordinates of the three-dimensional world, the world coordinate input parameter calibration point right, outside the parameters of the output matrix)

建立一个MIMO系统，通过这个系统可以很好的了解到整个MIMO系统组成和结构(The establishment of a MIMO system, the adoption of the system can be very good that the whole composition and structure of MIMO systems)

说明：  此代码为π_4DQPSK解调源程序，用MATLAB实现,使用差分方式。(This demodulation π_4DQPSK source code using MATLAB to achieve, the use of differential mode.)

This packet is a IS-95 baseband simulation for 1 data channel of 9.6 KBps rate. The simulation is written for static channel and AWGN noise. The packet include: 1) Packet Builder (Viterbi Encoding, Interleaver, PN generation) 2) Modulator (RRC filter) 3) Demodulator (Matched Filter, RAKE receiver) 4) Receiver (HD or SD) (Deinterleaver, Viterbi Decoder). You should run "Simulation.m" function that include all modules(This packet is a IS-95 baseband simulation for a channel data rate of 9.6 KBps. The simulati on is written for static channel and AWGN noise. The packet include : 1) Packet Builder (Viterbi Encoding. Interleaver. PN generation) 2) Modulator (RRC filter) 3) Dem odulator (Matched Filter, RAKE receiver) 4) Receiver (HD or SD) (Deinterl eaver. Viterbi Decoder). You should run "Simulation. m "function that include all modules)