High Mobility MIMO-OFDM Transmission With Realistic Propagation Scenarios

Hochmobiles MIMO-OFDM Zug

     
                                  

Robust and high-rate data transmission in highly mobile environments faces severe problems due to the time-variant channel conditions. Especially, synchronization, channel estimation and data recovery are affected.

This situation is caused by the high Doppler shift and spread of signals between transmitter and a fast moving receiver. In daily life the phenomenon can be observed if an ambulance with switched on siren moves towards or away from an observer.

                   
 

Hochmobiles MIMO-OFDM Doppler

interpol_zug high-speed ofdm
                

The focus of this project lies with exploiting multiple transmit antennas in conjunction with distributed receive antennas. This is meant to reduce the loss of time diversity wiith spatial diversit; furthermore, Doppler compensating antenna structure aim at upholding the fundamental principles of MIMO signal processing even under high mobility constraints.

Receiver-side fading reduction is achieved by forming beams into certain direction to divide the Doppler spectrum into several subspectra of reduced Doppler spread.Reducing the Doppler spread leads to less time variant channels such that the subsequent processing steps are simplified.

                                                           
 antenna-pattern high-speed OFDM
sectorization high-speed OFDM           

A further topic is modelling and minimizing antenna coupling as well as optimizing the antenna structures in real world scenarios, in which the different approaches are validated. Such scenarios are a high-speed train and car-to-car communication.


 

Details

Duration: 06/2008 - 06/2010
Funding:German Research Foundation
Partners:University Karlsruhe, Institute for Very High Frequency Technology and Electronics
Precursor:Multicarrier systems for fast moving receivers at high data rates

Publications

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1 | 2 vor

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