communication simulation

One issue with underwater sensors is how to efficiently transfer large amounts of data collected by the node to an interrogating platform such as an underwater vehicle. It is often impractical to make a physical connection between the node and the vehicle which suggests an acoustic or optical wireless solution. For large amounts of data, the high bandwidth of underwater optical wireless is an advantage. A small, low-cost platform to demonstrate the potential of an optical wireless communications interface for underwater sensor nodes is demonstrated. To enhance the reliability and robustness of the optical wireless communication digital signal processing and error correction techniques are used. The system was tested in 3 and 7.7 meter tanks at 5 Mbps with the turbidity of the water controlled by the addition of Maalox.

说明：  c++源程序代码 c++源程序代码(source code c c c source code source code)

说明：  8. 单径瑞利信道中的四发四收V-BLAST： (1) 请设计一种具体的导引辅助的信道估计方法，用Simulink进行仿真，测量16QAM调制时的误码率性能。画出比特信噪比与信道估计均方误差的关系曲线，画出比特信噪比与误码率的关系曲线。 (2) 计算所设计方案的频谱效率是多少，单位为bit/Hz/s。(8. Four transmit four receive v-blast in single-path Rayleigh channel: (1) please design a specific navigation-assisted channel estimation method and conduct simulation with Simulink to measure the bit error rate performance of 16QAM modulation.The relation curve between the bit signal-noise ratio and the mean square error of channel estimation is drawn, and the relation curve between the bit signal-noise ratio and the bit error rate is drawn. (2) calculate the spectral efficiency of the designed scheme in bit/Hz/s.)

A panel with test run counters.

半带滤波器，工作在采样率122.88Msps上(Half-band filter, working at the sampling rate of 122.88 Msps)

OFDM_cyclic_spectrum11,循环谱切片谱的一些原理性matlab代码(this is matlab code about OFDM_cyclic_spectrum)

VL53L0X英文原版操作手册，便于有一定编程基础的用户使用(VL53L0X English Original Manual)

功率谱密度的估计算法，simulink实现，现代信号处理第三章仿真实现。(Power spectral density estimation algorithm, simulink realization of modern signal processing Chapter Simulation.)

西門子CNC系統編程代碼表,對初學者幫助很大(Siemens CNC system control code )

基于深度限幅的OFDM峰均比抑制器的设计（限幅法是最简单直接的一种，以降低误码率性能 频谱畸变和计算复杂度为主要代价。）(matlab OFDM)