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首页> 外文会议>Computers in railways XI : Computer system design and operation in the railway and other transit systems >Development of a high-speed rail transmission system using digital signal processors for railway signalling
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Development of a high-speed rail transmission system using digital signal processors for railway signalling

机译：使用数字信号处理器开发用于铁路信号的高速铁路传输系统

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摘要

Railway signalling systems that transmit control information via rails have been deployed in many applications, for example, digital automatic train control (ATC) systems for controlling train speed. Since the performance of digital ATC systems depends on the signal transmission speed, recently there have been many studies aimed at realizing high-speed data transmission. However, it is difficult to increase the transmission speed because rails have strong attenuation at frequencies above about 10 kHz. Therefore, the present transmission speed limit of digital ATC using rails is about 300 bps. To overcome these limitations, we aimed to increase the transmission speed by improving the modulation method. In this paper, we propose a new modulation method combining code-division multiple access (CDMA) and quadrature amplitude modulation (QAM), called the CDMA-QAM method. This method transmits QAM symbols allocated based on a CDMA signal. It has the advantage that QAM errors can be recovered if they are in a range where they can be absorbed by CDMA demodulation. We developed a CDMA-QAM rail transmission system based on digital signal processors. We conducted a field experiment using an actual rail and verified that the system can achieve favourable constellation characteristics with about 20 dB attenuation of the received signal at a carrier frequency of 3 kHz.
机译：通过轨道传输控制信息的铁路信号系统已经部署在许多应用中，例如，用于控制列车速度的数字自动列车控制（ATC）系统。由于数字ATC系统的性能取决于信号传输速度，因此最近有许多研究旨在实现高速数据传输。但是，由于轨道在约10 kHz以上的频率上具有较强的衰减，因此很难提高传输速度。因此，当前使用导轨的数字ATC的传输速度限制约为300 bps。为了克服这些限制，我们旨在通过改进调制方法来提高传输速度。在本文中，我们提出了一种将码分多址（CDMA）和正交幅度调制（QAM）相结合的新调制方法，称为CDMA-QAM方法。该方法发送基于CDMA信号分配的QAM符号。其优点是，如果QAM错误在CDMA解调可以吸收的范围内，则可以将其恢复。我们开发了基于数字信号处理器的CDMA-QAM铁路传输系统。我们使用实际的轨道进行了现场实验，并验证了该系统可以实现良好的星座特性，并且在3 kHz的载波频率下接收信号的衰减约为20 dB。

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