Proposed Cdma-qam Modulation Method and Application to High-speed Rail Transmission Technology for Railway Signaling
نویسندگان
چکیده
In this paper, we propose a new modulation method combining code-division multiple access (CDMA) and quadrature amplitude modulation (QAM), called CDMAQAM. 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 and developed a CDMA-QAM rail transmission system having a transmission speed of 1500 bps using digital signal processors. We also conducted a field experiment using an actual rail and verified that the system can achieve favorable constellation characteristics.
منابع مشابه
Lessons for Policy Makers in Non-High Speed Rail Countries: A Review
High speed intercity passenger rail is an inherently strong railway application. It operates over 250 km/hour. For perspective, high-speed represents the ultimate development of preexisting standard gauge infrastructure. Network of high-speed passenger rail lines aimed at reducing accident, reducing traffic congestion, air pollution cutting national dependence on foreign oil and improving rural...
متن کاملStudy on different solutions to reduce the dynamic impacts in transition zones for high-speed rail
One of the most important factors influencing the track maintenance is the transitions between parts of the track with different vertical stiffness. The dynamic...
متن کاملA Study of the Wear Behavior of a Rail Material
The rail track is one of the most important elements of a railway system. During the passage of trains, the rails are subjected to contact load that comes from the wheels of the train. The railway track often fails in service due to wear caused by contact fatigue and other wear damage mechanisms that could also limit the life span of the railway infrastructure and railway vehicle. The aim of t...
متن کاملVibration of Train-Rail-Bridge Interaction Considering Rail Irregularity with Arbitrary Wavelength
A generation method for the rail random irregularity with arbitrary wavelength interval (WI) is developed, and its accuracy and efficiency are demonstrated. Then a moving wheel-rail-bridge interaction element is derived to establish the finite element equations of motion for the train-rail-bridge interaction system, and the flow chart of assembly and calculation for the system equations is give...
متن کاملEffect of Rail Corrugation on the Amount of Train Induced Vibrations near a Historical Building
The evaluation and control of the trains induced vibrations needs even more attention in the case of underground tracks which passes near to monuments and historical sites. The rail corrugations which occur due to the wheels’ impulse loads during the operation period of underground railway tracks, usually amplify the ground borne noise and vibration. In the current study, the mentioned phenomen...
متن کامل