Chapter5

基于matlab的原模图仿真代码程序，有需要的可以在这上面改进(Simulation code program of original model graph based on MATLAB)

本程序是将串口实时接收到的数据，然后将数据进行曲线绘制。(The data received by serial port is plotted in real time.)

直扩码分多址DS-CDMA是利用高速的WALSH正交码序列作为地址码，与多用户信息数据相乘得到信息数据的直接扩频信号，再经过BPSK调制后发送出去，经过AWGN无线信道的传输后，在接收端与本地产生的地址码进行相关检测，从中将地址码与本地码一致的用户数据选出，把不一致的用户数据删除。(DS-CDMA DS-CDMA is the use of high-speed WALSH orthogonal code sequences as address code, with multi-user information data has been multiplied by the direct spread spectrum data information signal, and then after a BPSK modulated sent through AWGN channel after transmission, at the receiving end with the locally generated address code associated Detect, which will address code with local codes consistent user data elected to delete user data inconsistencies.)

bpsk调制仿真，可直接用 1、数字调制方法 数字调制就是把数字基带信号的频谱搬移到高频处，形成适合在信道中传输的带通信号。基本的数字调制方式有振幅键控（ASK）、频移键控（FSK）、绝对相移键控（PSK）、相对（差分）相移键控（DPSK）。在接收端可以采用想干解调或非相干解调还原数字基带信号。 数字信号的传输方式分为基带传输和带通传输。然而，实际中的大多数信道（如）无线信道具有丰富的低频分量。为了使数字信号在带通信道中传输，必须用数字基带信号对载波进行调制，以使信号与信道的特性相匹配。(1, digital modulation method Digital modulation is the transfer of the spectrum of a digital baseband signal to a high frequency to form a bandpass signal suitable for transmission in the channel. The basic digital modulation methods are amplitude keying (ASK), frequency shift keying (FSK), absolute phase shift keying (PSK), and relative (differential) phase shift keying (DPSK). At the receiving end, the digital baseband signal can be restored by using dry demodulation or non-coherent demodulation. Digital signal transmission methods are divided into baseband transmission and bandpass transmission. However, most channels in practice, such as wireless channels, have rich low frequency components. In order for a digital signal to be transmitted in a band channel, the carrier must be modulated with a digital baseband signal to match the signal to the characteristics of the channel.)

说明：  汽车诊断协议 基于UDS的网络层源代码(Network Layer Source Code Based on UDS for Automobile Diagnosis Protocol)

RS485程序,包括接收部分判断校验,有很强的参考价值()

北斗卫星导航系统空间信号接口控制文件，这是正式版(BeiDou Navigation Satellite System Interface Control Document)

说明：  极化码极化信道仿真，信道极化是信道合并与信道分裂两种信道操作的结果。在上述两种操作下，原本相同的N个W信道产生了极化现象，其中一部分信道的信道容量趋近于1，另一部分信道的信道容量趋近于0。(Channel polarization is the result of channel merging and channel splitting. Under the above two operations, the original n w channels have polarization phenomenon. The channel capacity of one part of the channel approaches to 1, and the channel capacity of the other part approaches to 0.)

基于FPGA的16QAM调制解调设计，以及仿真实现(Design of 16QAM Modulation and Demodulation Based on FPGA)

实现Ethercat现场通讯的主从站代码实例(An Example of Master-slave Station Code for Ethercat Field Communication)