基于PSK调制的数字通信信号仿真分析技术

Simulation analysis technology of digital communication signal based on PSK modulation

基于PSK调制的数字通信系统在无线通信工程实践中有着广泛的应用,由于受到各种条件的限制,从实际工程系统接收到的PSK数字通信信号在教学科研中不易获得,而PSK调制仿真数据则可以自己产生。在掌握通信原理和仿真技术的基础上利用Matlab实现对BPSK、DPSK、QPSK、DQPSK、8PSK、π/4-DQPSK、OQPSK等数字通信信号源的模拟仿真,可对调制体制、工作频率、传输码率、采样频率、信道特征等参数进行灵活设置,并按要求生成规定格式的DAT数据文件,可作为调制方式识别软件的训练和测试样本。结合模方谱、平方谱、四次方谱、八次方谱等谱线参数特征,同时结合星座图和眼图进行基于PSK调制的数字通信信号的调制体制判别和验证。

The digital communication system based on PSK modulation is widely used in the practice of wireless communication engineering.Due to various conditions,the PSK digital communication signal received from the actual engineering system is difficult to obtain in teaching and scientific research,while the PSK modulation simulation data can be generated by itself.On the basis of mastering the communication principle and simulation technology,this paper uses Matlab to simulate digital communication signal sources such as BPSK,DPSK,QPSK,8PSK,π/4-DQPSK,OQPSK,etc.It can flexibly set parameters such as modulation system,working frequency,transmission code rate,sampling frequency and channel characteristics,and generate data files with specified formats as required.It can be used as a training and testing sample for modulation mode identification software.In addition,this paper combines the spectral line parameter characteristics such as modular square spectrum,square spectrum,fourth power spectrum,eighth power spectrum,etc.,and combines constellation diagram and eye diagram to identify and verify the modulation system of digital communication signals based on PSK modulation.