一种数字非相干接收机的实现

Realization of a Digital Noncoherent Receiver

本文介绍了电子不停车收费(ETC)系统中路侧单元(RSU)接收机的一种数字化实现方法。该接收机前端利用FPGA芯片,采用中频采样和数字非相干解调方案实现,较之传统接收机性能有较大提高。该接收机具有动态范围大、调制度变化范围大、信号失真小、码字不丢失等特点,大大提高了数据通信的可靠性,增强了交通设施的通行能力和服务水平。

In the paper, a new digital road side unit(RSU) receiver front for electronic toll collection(ETC) system was designed and implemented. The receiver front is realized by IF sampling and digital noncoherent demodulation method. By comparison with the traditional analog receiver, the new receiver module exhibits better performance. The module is based on FPGA, with the advantage of larger dynamic range, larger modulation index range, small waveform distortion and so on. It improved the reliability of data communication greatly.