Rate-Maximizing OFDM Pilot Patterns for UAV Communications in Nonstationary A2G Channels

05/22/2018
by   Raghunandan M. Rao, et al.
0

In this paper, we propose and evaluate rate-maximizing pilot configurations for Unmanned Aerial Vehicle (UAV) communications employing OFDM waveforms. OFDM relies on pilot symbols for effective communications. We formulate a rate-maximization problem in which the pilot spacing (in the time-frequency resource grid) and power is varied as a function of the time-varying channel statistics. The receiver solves this rate-maximization problem, and the optimal pilot spacing and power are explicitly fed back to the transmitter to adapt to the time-varying channel statistics in an air-to-ground (A2G) environment. We show the enhanced throughput performance of this scheme for UAV communications in sub-6 GHz bands. These performance gains are achieved at the cost of very low computational complexity and feedback requirements, making it attractive for A2G UAV communications in 5G.

READ FULL TEXT

page 1

page 2

page 3

page 4

research
03/23/2022

Deep Channel Prediction: A DNN Framework for Receiver Design in Time-Varying Fading Channels

In time-varying fading channels, channel coefficients are estimated usin...
research
02/05/2021

Gridded UAV Swarm for Secrecy Rate Maximization with Unknown Eavesdropper

This paper considers grid formation of an unmanned aerial vehicle (UAV) ...
research
07/24/2023

Underlaid Sensing Pilot for Integrated Sensing and Communications

This paper investigates a novel underlaid sensing pilot signal design fo...
research
11/21/2019

Time Varying Channel Tracking for Multi-UAV Wideband Communications with Beam Squint

Unmanned aerial vehicle (UAV) has become an appealing solution for a wid...
research
04/28/2020

UAV-to-Ground Communications: Channel Modeling and UAV Selection

Unmanned aerial vehicle (UAV)-enabled communications have been proposed ...
research
06/27/2022

Adaptive Decoding Mechanisms for UAV-enabled Double-Uplink Coordinated NOMA

In this paper, we propose a novel adaptive decoding mechanism (ADM) for ...
research
06/27/2022

A Simple Frequency Diversity Scheme for Ultra-Reliable Communications in Ground Reflection Scenarios

We consider a two-ray ground reflection scenario with unknown distance b...

Please sign up or login with your details

Forgot password? Click here to reset