Radio Links With Highest Data Rates on Fast Altering Radio Channels Based on WLAN Principles

Responsible:

The Objectives:

Telefunken’s goal within the project WIGWAM is to ensure the suitability of a new standard also for communication scenarios for high velocity trains an vehicles. The velocity of the mobiles within this scenario is about 500km/h for trains and about 250km/h.
Due to the experiences from former projects the use of MIMO-techniques seams to be usable and necessary to achieve the required availability under the high data rates.
For a most effective use of the available data rate on air the protocol stacks shall be optimized for this scenario.
To verify the features of this project the transmission will be demonstrated by using modified front-end transceivers (38GHz) from Transrapid project.

Advantages of the Train and High Speed Scenario:

Due to the requirement of high availability it is necessary to implement position diversity as well as space diversity to ensure the radio link even at low channel quality. In addition to this the capacity of the channel shall be used for high data rates as long as the channel quality is high.

The scenario includes ‘line of sight’ conditions and Doppler-shift but no Doppler spread. The use of software reconfigurable hardware for the modulation and demodulation is planned.

Activities:

• System concept
• Simulation and demonstration of the concepts
• Analyses of the modulation types
• Design of the MIMO-configuration
• Modeling of MAC-protocols
• Design of routing mechanism

Possible Applications

• Safety application for high speed trains and mass transportation systems
• Security application in trains and underground systems
• Passenger communication
• Guide way monitoring and others