Catalog

1. Algorithm description and some source code

2. Preview of some simulation drawings

3. Source code acquisition method

1. Algorithm description and some source code

       2DPSK Also known as relative phase shift keying , It does not use the absolute value of carrier phase to transmit digital information , Instead, digital information is transmitted with the relative carrier phase values of the front and rear symbols . The so-called relative carrier phase refers to the difference between the initial phase of this code and the previous symbol .

2. Preview of some simulation drawings

· String and parallel

The simulation results are as follows ：

Pictured , The input signal here is 1000001000_0110001010_0111101000

Get data after serial parallel （ Because of the delay 1 Symbols , The first value of the data is not included in the calculation , Not shown in the last bitmap ）：

I： 1 0 0 1 0   0 1 0 0 1   1 0 1 1 1 0

Q：0 0 0 0 0   1 0 0 0 0   0 1 1 0 0 0

· Level conversion

about 2/4 Level conversion , In fact, the input signal is 4 States （00,01,10,11） After coding, it becomes the corresponding 4 Level signal . The mapping relationship we choose here is shown in table 4-1 Shown .

The simulation results are as follows ：

The final rate becomes the of the original data 1/4 了 .

· Carrier modulation

The simulation results of the model are as follows ：

· Add Gaussian white noise

This module is relatively simple , But what we need to pay attention to is ：

Its parameters include the input of the power of an input signal , So we need to add the following modules to the model ：

This module is to calculate the power of the signal , take 5.091 Enter it into the parameter setting .

The above is the simulation of the modulation part and the final constellation

Let's start the simulation demodulation part ：

· Down conversion

The simulation results are as follows ：

· wave filtering

  here , The module used by the filter is ：

· After level conversion, the following results are obtained ：

· Finally, parallel serial conversion

Through observation and previous data , Find the same , This shows that it is correct , Finally, add the bit error rate statistics module , The bit error rate is ：

This bit error rate is two times more than the delay at the beginning of transmission bit According to the information .

The bit error rate curve is simulated below ：

Because the bit error rate curve is in different SNR Simulated under , So here we need the help of MATLAB union Slimulink Conduct simulation .

16QAM and 2DPSK Comparison of ：

3. Source code acquisition method

Get the way 1：

Click the download link ：

m be based on simulink Of 16QAM and 2DPSK Communication link simulation , And pass matlab call simulink The model obtains the bit error rate curve

Access method 2：

Blog resource item , Search for resources with the same name as blog .

Access method 3：

If the download link fails , Blogger wechat contact .