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详细分析SDPSK(Symmetrical DPSK)的调制特性,提出一种基带编解码方法及定时同步方法。基带编解码器由开关、延时单元和逻辑运算单元构成,不涉及复杂运算;而定时同步方法,直接通过基带信号运算得到同步时钟,不需要锁相环,运算量小。因此,所提出的基带编解码方法和定时同步方法非常适合硬件实现。仿真结果验证了算法的正确性。另外,通过对解调器性能的测试,分析了算法的局限性及应用范围。
The modulation characteristics of SDPSK (Symmetrical DPSK) are analyzed in detail. A baseband coding and decoding method and timing synchronization method are proposed. The baseband codec consists of a switch, a delay unit, and a logic operation unit, and does not involve complex operations. The timing synchronization method directly obtains the synchronization clock through the baseband signal operation without the need of a phase-locked loop and requires a small amount of operation. Therefore, the proposed baseband codec method and timing synchronization method are very suitable for hardware implementation. The simulation results verify the correctness of the algorithm. In addition, through the test of the performance of the demodulator, the limitations of the algorithm and the application range are analyzed.