 |
According to system requirements, it is necessary to independently develop the demodulation algorithm module and the NRZI decoding module, while other functions can be directly called from the GNU Radio software platform. Using the gr_modtool, first create a new project, then navigate to the directory and name the module. After that, select the port type, modify the header files, and adjust the C++ files to complete the custom module development. The specific development process is shown here.
For the NRZI decoding module, each output item depends on the state of the current input item and the previous input item. By using the XOR operation, the changes in the signal can be determined, and then through negation and the AND operation, the corresponding decoded result is ultimately output.
For the decoding algorithm module, this paper has chosen the classic 1-bit differential phase demodulation algorithm as the system testing algorithm, which performs the conjugate multiplication of the current symbol with the previous symbol.
|
IEEE/ICACT20250166 Slide.12
[Big Slide]
[YouTube]