Doppler Spoofing in OFDM Wireless Communication Systems

TL;DR

This paper introduces a method to prevent unauthorized receivers from estimating the Doppler shift in OFDM signals by inserting artificial frequency variations, thereby enhancing privacy of the transmitter's speed information.

Contribution

The paper proposes a novel Doppler spoofing technique that disguises the true Doppler shift, protecting transmitter speed privacy without affecting legitimate data demodulation.

Findings

Effective in preventing Doppler shift estimation by unauthorized receivers

Reliable in preserving data demodulation for legitimate receivers

Demonstrated through simulation results

Abstract

In this paper we present a method that prevents an unauthorized receiver (URx) from correctly estimating the Doppler shift present in an orthogonal frequency division multiplexing (OFDM) wireless signal. To prevent this estimation we propose to insert an artificial frequency variation in the transmitted signal that mimics a transmitter (Tx) movement with a spoofed/fake speed. This spoofed Doppler shift does not affect data demodulation since it can be compensated at the legitimate receiver (LRx). We evaluate our method for its efficacy through simulations and we show that it offers a reliable way to protect one key element of the privacy of a wireless source, namely the speed of the transmitter.