MQAM_4096QAM

用C#实现ModBus读写功能，用作客户端读写ModBus-TCP server数据(Modbus read and write functions in C#)

1. 关于无线信道的多普勒谱，请回答以下问题： (1) 在某些无线信道中，多普勒频移会引起无线信道输出信号的混叠。请清楚的描述产生混叠的各种原因； (2) 无线信道中的多普勒谱有一种经典谱(classic spectrum)，请解释产生这种谱形状的机理； (3) 请用S-function产生一单径瑞利信道，其多普勒谱为经典谱，其中移动速率为120km/h。并请回答：证明自己用计算机产生的经典谱是正确的可能方法。 (Doppler spectrum of radio channel 1, please answer the following questions (1) In some wireless channel, radio channel Doppler shift will cause the output signal aliasing. Please clearly describe aliasing for various reasons )

BPSK在OFDM系统不同信道下的误码率比较(This is a Script for computing the BER for BPSK in OFDM modulation in the AWGN channel.)

多雷达联合定位，通过距离矩阵形成椭圆，并求取交点完成定位(Multi-radar joint positioning, ellipse is formed by distance matrix, and intersection point is obtained to complete positioning.)

基于matlab的水下通信系统仿真及波束形成算法(Underwater communication system)

整个OFDM的matlab仿真代码，使用16qam调制，还有word的文档，讲解很细(The OFDM matlab simulation code, the use of 16 qam modulation, and word document, very fine )

说明：  各种polar编译码函数，包括SC译码，BP译码，SCL译码以及循环检测编码(Various polar encoding and decoding functions, including SC decoding, BP decoding, SCL decoding and cyclic detection coding)

function [ Current,impedance_matrix,matrix_excitation] = calculate_current(length,Frequency,no_divisions, Radius)

基于matlab的PN码的同步仿真，包含详细代码，可以直接运行(Matlab based PN code synchronization simulation, including detailed code, can run directly)

HDLC控制协议中CRC校验码算法代码，为CRC16，Verilog语言(HDLC Control Protocol Code in the CRC checksum algorithm code for CRC16, Verilog language)