OFDM for Payload Communications of UAS: Channel Estimation and ICI Mitigation

Document Type

Article

Publication Date

1-1-2017

Publication Title

IET Communications

Volume

11

Issue

15

First page number:

2350

Last page number:

2356

Abstract

For real-time transmission of high-bandwidth sensor data from an unmanned aircraft vehicle (UAV) to the ground station (GS) in an unmanned aircraft system, a high-speed payload communication system is essential. While orthogonal frequency-division multiplexing (OFDM) is very effective for terrestrial wideband systems, possible higher speed of UAVs or higher carrier frequencies can increase the Doppler shift, and therefore increase the inter-carrier interference (ICI) in OFDM systems. In these scenarios, the complete frequency-domain channel matrix should be estimated and used for ICI mitigation and data recovery. In this study, a time-domain pilot-based channel estimation scheme is described to estimate the entire frequency-domain channel matrix for moderate-to-high Doppler OFDM systems. Simulation results indicate that the new scheme provides better performance compared with channel estimation schemes designed for low Doppler scenarios that partially estimate the frequency-domain channel matrix. The comparison is also presented with the other full channel estimation scheme, named autoregressive scheme, showing a comparable performance with much lower complexity for the new scheme. © 2017, The Institution of Engineering and Technology.

Language

english

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