基于软件无线电语音通信系统设计

Design of voice communication system based on software radio

本系统基于软件无线电的思想设计,采用ARM+FPGA+AD/DA的硬件架构,可实现语音采集、语音输出、信号调制和解调、频点设置;通过RS422通信接口实现系统控制;系统具有开机、启动自检、自检定时上报等功能。本系统选用zynq7000系列为系统的核心控制,由主处理模块对系统各模块状态进行检测,并将故障隔离到模块级,方便系统维护以及波形软件升级。采用AD9364集成射频捷变收发器替代分立式元器件完成射频收发端硬件电路的搭建。采用SGTL5000完成模拟语音信号采集,信号的输出。结果表明,该系统可以稳定的可靠的实现语音通信功能,其中系统发射功率空口可达-12 dbm;音频调制失真度可低至3%;接收灵敏度可达-118 dbm(AM SNR=10);音频输出失真度可低至5%。实现了无线语音系统的小型化,易便携,功耗低,而且其可适用性强。本系统可广泛应用于航海船舶通信,航空航天飞机通信,单兵通信等领域,具用深远的商用价值以及军用价值。

The system design based on software radio, the hardware is architecture of ARM＋FPGA＋AD/ DA, which can realize speech acquisition, speech output, signal modulation and demodulation, frequency setting; it control system through RS422 communication interface; The system chooses zynq 7000 series as the core control of the system. The main processing module detects the status of every module of the system, and isolates the fault to the module level, which is convenient for system maintenance and waveform software upgrading. The radio frequency agility transceiver is integrated with AD9364 to replace the discrete device to complete the hardware construction of the transceiver. Using SGTLS000 to complete analog voice signal acquisition, signal output. The results show that the system is stable and reliable to realize voice communication function, which can make the transmission power of the system can reach- 12 dbm; audio modulation distortion can be as low as 3% ; the receiving sensitivity can reach- 118 dbm （AM SNR=10） ; audio output distortion can be as low as 5%. The wireless voice system is miniaturized, easy to be portable, low power, and its applicability is strong. This system can be widely used in ship communication, aircraft communication, single soldier communication and other fields, with far-reaching commercial value and military value.