A two-hop MIMO relay architecture using LTE and millimeter wave bands in high speed trains

One primary challenge in High Speed Trains (HST) is that mobile communications suffer from severe attenuation and high Doppler spread in Long Term Evolution-Advanced (LTE-A) scenarios. In this article, a novel two-hop relay architecture is presented by utilizing Mobile Relay Nodes (MRN) and millimeter wave (mmWave) bands at 60 GHz to forward the signal inside the train. A Multiple-Input Multiple-Output (MIMO) channel is established between the Donor-eNB (DeNB) and the Users Equipment (UE) to enhance channel capacity. Finally, performance analysis is studied and discussed by means of a downlink-level simulator.

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