4lscma

说明：  太赫兹通信方面的代码，可以对照相关文献看(Terahertz communication)

绘制了24课GPS卫星围绕地球旋转的动态图(A dynamic map of the rotation of GPS satellites around the Earth in lesson 24 has been drawn.)

MIMO技术中瑞利衰落信道的MATLAB源程序的仿真(rayleigh fading channel generator)

在LDPC译码中用LLR方式,跌代次数分别为5和10对译码性能的影响MATLAB写的()

这个程序除了接收机同步、信道编码没有加入外，基本上反映了一个OFDM系统的特性： 1. qpsk/16qam/64qam映射、解映射 2. OFDM调制解调（循环前缀，FFT等） 3. 非整数采样时刻多径时延的多径信道 4. Rayleigh或者Rician多径信道 5. 信道的连续时变（非block fading） 6. 线性插值信道估计 7. FFT变换域插值信道估计(In addition to this program receiver synchronization, channel coding have not joined, the basically reflect the characteristics of an OFDM system: 1. Qpsk/16qam/64qam mapping, mapping solution 2. OFDM modulation and demodulation (cyclic prefix, FFT, etc.) 3. Non- integer sampling instant multi-path delay of multi-path channel 4. Rayleigh or Rician multipath channel 5. a continuous time-varying channel (non-block fading) 6. linear interpolation channel estimation 7. FFT transform domain interpolation channel estimation)

说明：  4. 试说明卷积编解码的工作原理： (1) 使用Simulink仿真卷积编码，并用Viterbi译码的方法进行解码，其中的编码、译码全部是自己编写代码(S-Function方式)，不是调用Simulink的已有编码、译码函数。 (2) 请在加性白高斯噪声信道中，画出比特信噪比与误码率的关系曲线。(4. Try to explain the working principle of convolutional codec: (1) Simulink was used to simulate convolutional coding, and Viterbi decoding method was used for decoding. The coding and decoding were all written by oneself (s-function method), rather than calling the existing coding and decoding functions of Simulink. (2) in the additive white gaussian noise channel, please draw the curve of the relationship between bit signal-to-noise ratio and bit error rate.)

说明：  基于传统信道估计LS，MMSE，和不同多普勒频移下的误码率等(Based on the traditional channel estimation ls, MMSE, and different Doppler frequency shift bit error rate)

ModBus水质分析仪CRC计算的接口STM32F2实现，此应用适用于市面大部分Modbus水质协议的CRC校验(ModBus water quality analyzer CRC calculation of the interface STM32F2 implementation, this application is applicable to most of the market Modbus water quality agreement CRC calibration)

利用MATLAB来进行大气信道中的激光通信仿真，英文原版(Optical Wireless Communication Systems-system and chanel modelling with matlab)

说明：  mimo各个信道具体源码，包括高斯、瑞利、多径衰弱等信道模型，本人将其调试、整理并附上运行结果。(MIMO channel specific source code, including Gaussian, Rayleigh, multipath fading and other channel models, I will debug, collate and attach the operation results.)