一种基于bladeRF的软件无线电系统

A software radio system based on bladeRF

在Windows环境下应用bladeRF平台结合MATLAB设计了一种软件无线电系统。该系统由计算机端、bladeRF硬件平台和调频步话机三部分组成。以调频FM信号为开发实例,设计了系统从读取音频到调制发射,解调接收至实时播放的流程,并通过bladeRF提供的计算机端MATLAB软件接口,对FM信号在调制解调过程中的采样频率、带宽、内插抽取点数、频偏等参数进行动态地修改和调整。实验设置步话机收听频率为455.500 MHz,发射频率为460.002 MHz。结果表明,调试发射阶段,步话机调频至455.5 MHz时自动转为接收模式并播放音频;调试接收阶段,步话机调频至460.002 MHz时不间断地对讲,扬声器能实时地保持低噪,稳定的播放语音。实现了步话机与系统之间的FM双边通信。

A software radio system is designed by using bladeRF platform with MATLAB in Windows environment. The system consists of computer terminal, bladeRF hardware platform and frequency modulation walkie-talkie. The flow of the system based on the FM signal as a development example is designed from reading audio to modulation transmission and from demodulation reception to real-time playback. The parameters can be modify and adjust dynamically in the process of FM signal modulation and demodulation, such as sampling frequency, bandwidth, interpolation points, frequency deviation through the software interface of MATLAB provided by bladeRF. The receive frequency of walkie-talkie is turned to 455. 500 MHz, and the launch frequency of 460. 002 MHz. Experimental results show that in debug launch stage, when the frequency of walkie-talkie turned to 455. 5 MHz , the audio is received and played automatically; and in debug receive stage, turning the frequency of walkie-talkie to 460. 002 MHz, the radio is played steadily and the noise is kept in a low level through the speaker when talk uninterruptedly. The FM bilateral communication is therefore achieved between the walkie-talkie and the system.