Summary
International Technical Conference on Circuits/Systems, Computers and Communications
2008
Session Number:P2
Session:
Number:P2-116
Proposed CDMA-QAM Modulation Method and Application to High-Speed Rail Transmission Technology for Railway Signaling
Hiroshi Mochizuki, Sei Takahashi, Hideo Nakamura, Satoshi Nishida, Ryo Ishikawa,
pp.-
Publication Date:2008/7/7
Online ISSN:2188-5079
Summary:
We propose a new modulation method combining code-division multiple access (CDMA) and quadrature amplitude modulation (QAM), called CDMA-QAM. It transmits QAM symbols allocated based on a CDMA signal, and it has the benefit that QAM errors can be recovered if they are in a range where they can be absorbed by CDMA demodulation. We applied the method to railway signaling. We also conducted a field experiment using a rail and verified that the system can achieve favorable constellation characteristics.