Open AccessOFDM for payload communications of UAS: channel estimation and ICI mitigation
Author(s) -
Vahidi Vahid,
Saberinia Ebrahim
Publication year - 2017
Publication title -
iet communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.355
H-Index - 62
eISSN - 1751-8636
pISSN - 1751-8628
DOI - 10.1049/iet-com.2017.0358
Subject(s) - payload (computing) , orthogonal frequency division multiplexing , channel (broadcasting) , computer science , telecommunications , electronic engineering , computer network , engineering , network packet
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.