Network Coded Information Raining Over High-Speed Rail Through IEEE 802.16j

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Executive Summary

Delivering internet access to high-speed trains using conventional cellular systems is complicated due to the need to perform hand-off for many subscribers, all with high mobility. In addition, capacity is reduced due to poorer radio channel conditions as existing multipath channel impairments are exacerbated by the Doppler shift caused by high velocities. Doppler shift is particularly disruptive to wireless access technologies that rely on Orthogonal Frequency Division Multiplexing (OFDM) modulation, such as IEEE 802.16e, since the shifting of subcarrier frequencies results in the loss of their orthogonality.

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