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针对OPNET软件在水声网络协议仿真中不支持信道结构改变和自定义调制方式的局限,以啁啾扩频的水声网络ALHOA协议仿真为例,提出了一种适合在OPNET上实现更真实水声通信协议仿真的方法。物理层调制方式采用自定义的π/4-DM-DQPSK制式,利用MATLAB将生成的调制曲线导入OPNET中配合OPNET其他管道的配置。在2种具有结构差异的Bellhop信道中验证对ALHOA协议的仿真效果,结果表明信道结构的变化能灵敏地影响ALHOA协议的仿真。此方法对利用OPNET软件灵活开展水声网络协议仿真具有较好的参考价值。
Aiming at the limitation that OPNET software does not support the change of channel structure and custom modulation in the simulation of underwater acoustic network protocol, this paper takes the chirp spread spectrum acoustic network ALHOA protocol simulation as an example, Acoustic communication protocol simulation method. The physical layer modulation mode uses a custom π / 4-DM-DQPSK standard, the use of MATLAB will generate the modulation curve into OPNET OPNET with other pipeline configuration. The simulation of ALHOA protocol was validated in two kinds of Bellhop channels with structural differences. The results show that the change of channel structure can sensitively affect the simulation of ALHOA protocol. This method has a good reference value for using OPNET software to carry out the simulation of underwater acoustic network protocol.