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Integrating OTFS in Airplane-Aided Next-Generation Networking

Ashok S Kumar, Shashank Shekhar, Gokularam Muthukrishnan, Muralikrishnan Srinivasan, Sheetal Kalyani

TL;DR

The paper tackles the Doppler-induced reliability challenges of delivering high-rate terrestrial connectivity via airliner/HAP platforms in dynamic environments. It presents an OTFS-based airplane-aided networking architecture that employs NSB beamforming on a large planar antenna array and DD-domain equalization to mitigate interference and time-variation. Through a detailed system model, OTFS frame structure, and receiver processing, the authors demonstrate, via simulations, that OTFS consistently outperforms OFDM across altitude, speed, and array configurations, with notable BER gains in high-mobility aerial channels. The work suggests that OTFS-based airborne-terrestrial networks can significantly enhance next-generation connectivity, particularly for rural or underserved regions requiring stable, high-rate links.

Abstract

Next-generation networks explore the opportunistic assistance of airliner/high-altitude platforms (HAPs) in delivering high data rates for terrestrial networks to ensure consistent and reliable communication. When an airliner/HAP moves at very high speeds, its mobility has a substantial impact on ensuring seamless connectivity, stable signal strength, and reliable data transmission. Orthogonal time frequency space (OTFS) modulation has been shown to provide notable improvement in performance when handling Doppler effects during high-mobility situations. This paper presents an OTFS-based airplane-aided next-generation networking system. In the proposed system, the airliner/HAPs are equipped with a planar antenna array that applies null steering beamforming (NSB) at the transmitter for communication with terrestrial users. A comprehensive performance comparison between OTFS and orthogonal frequency division multiplexing (OFDM) is performed under varying airliner altitude, velocity, array dimension, and Rician factor conditions. The simulation results show that OTFS consistently outperforms OFDM, achieving a lower bit error rate (BER) and more stable performance across different airliner altitudes, velocities, array dimensions, and propagation environments.

Integrating OTFS in Airplane-Aided Next-Generation Networking

TL;DR

The paper tackles the Doppler-induced reliability challenges of delivering high-rate terrestrial connectivity via airliner/HAP platforms in dynamic environments. It presents an OTFS-based airplane-aided networking architecture that employs NSB beamforming on a large planar antenna array and DD-domain equalization to mitigate interference and time-variation. Through a detailed system model, OTFS frame structure, and receiver processing, the authors demonstrate, via simulations, that OTFS consistently outperforms OFDM across altitude, speed, and array configurations, with notable BER gains in high-mobility aerial channels. The work suggests that OTFS-based airborne-terrestrial networks can significantly enhance next-generation connectivity, particularly for rural or underserved regions requiring stable, high-rate links.

Abstract

Next-generation networks explore the opportunistic assistance of airliner/high-altitude platforms (HAPs) in delivering high data rates for terrestrial networks to ensure consistent and reliable communication. When an airliner/HAP moves at very high speeds, its mobility has a substantial impact on ensuring seamless connectivity, stable signal strength, and reliable data transmission. Orthogonal time frequency space (OTFS) modulation has been shown to provide notable improvement in performance when handling Doppler effects during high-mobility situations. This paper presents an OTFS-based airplane-aided next-generation networking system. In the proposed system, the airliner/HAPs are equipped with a planar antenna array that applies null steering beamforming (NSB) at the transmitter for communication with terrestrial users. A comprehensive performance comparison between OTFS and orthogonal frequency division multiplexing (OFDM) is performed under varying airliner altitude, velocity, array dimension, and Rician factor conditions. The simulation results show that OTFS consistently outperforms OFDM, achieving a lower bit error rate (BER) and more stable performance across different airliner altitudes, velocities, array dimensions, and propagation environments.
Paper Structure (5 sections, 9 equations, 6 figures, 1 table)

This paper contains 5 sections, 9 equations, 6 figures, 1 table.

Table of Contents

  1. Introduction
  2. System Model
  3. OTFS Reception at the User
  4. Simulation Results
  5. Conclusions

Figures (6)

  • Figure 1: The airliner/HAP is initially assumed to be located at the point A $(0, 0, 0)$. The Macro-cell radius $R$ denotes the distance measured from the center of the macro-cell. At point A, there is an initial LoS and NLoS condition between the user and the airliner. As the airliner/HAP moves from point A to point C, the LoS and NLoS conditions may change over time.
  • Figure 2: Block diagram of the proposed OTFS system for airplane-aided integrated networking
  • Figure 3: BER performance comparison between OTFS and OFDM, with varying Rician factor, $\kappa_d$ (Height = 10 km, Speed of HAP = 150 m/s, antenna dimension = $100 \times 100$)
  • Figure 4: BER performance comparison between OTFS and OFDM, with varying airliner height ($\kappa_d$ = 10 dB, velocity of HAP = 150 m/s, antenna dimension = $100 \times 100$)
  • Figure 5: BER performance comparison between OTFS and OFDM, with varying velocity of HAP (Height= 10 km, $\kappa_d$ = 10 dB, antenna dimension = $100 \times 100$)
  • ...and 1 more figures