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本文通过分析、计算,设计了一套数据无线传输系统,该系统工作频率为85 MHZ,可以采用普通调频接收机接收,数据传输速率为50Bit/s。系统为二次调制:首先将数字信号进行2FSK调制,然后经过频率调制发射,实现短距离无线传输。接收部分首先经过调频接收机还原成2FSK信号,利用锁相环技术进行FSK信号的解调,再通过波形整形电路对输出波形进行整形,还原成数字信号。该系统的设计可用于短距离的数字无线传输,传输距离达到50米,具有较强的实用性。
In this paper, a set of data wireless transmission system is designed, analyzed and calculated. The operating frequency of this system is 85 MHZ, which can be received by ordinary FM receiver with data transmission rate of 50Bit / s. System for the second modulation: First, the digital signal 2FSK modulation, and then transmitted by frequency modulation to achieve short-range wireless transmission. The receiving part is first restored to 2FSK signal by the FM receiver, demodulated by FSK signal using the phase-locked loop technique, and then the output waveform is shaped by the waveform shaping circuit to be reduced to a digital signal. The system is designed for short digital wireless transmission, transmission distance up to 50 meters, with strong practicality.