Development of CDMA-QAM Rail Transmission Device for Railway Signaling

Hiroshi MOCHIZUKI; Sei TAKAHASHI; Hideo NAKAMURA; Satoshi NISHIDA; Minoru SANO; Ryo ISHIKAWA

doi:10.1299/jmtl.3.358

Papers

Development of CDMA-QAM Rail Transmission Device for Railway Signaling

Hiroshi MOCHIZUKI, Sei TAKAHASHI, Hideo NAKAMURA, Satoshi NISHIDA, Minoru SANO, Ryo ISHIKAWA

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Keywords: Railway Signaling, Track Circuit, CDMA, QAM, DSP, FPGA

JOURNAL FREE ACCESS

2010 Volume 3 Issue 1 Pages 358-371

DOI https://doi.org/10.1299/jmtl.3.358

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Abstract

To realize high-speed data transmission for railway signaling systems, we propose a novel modulation method combining code-division multiple access (CDMA) and quadrature amplitude modulation (QAM), called the CDMA-QAM method. We evaluated the effectiveness of the proposed method and developed a CDMA-QAM rail transmission system based on DSPs and an FPGA. In addition, we conducted a field trial using an actual rail.

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