Active RIS Enabled NLoS LEO Satellite Communications: A Three-timescale Optimization Framework

TL;DR

This paper proposes a three-timescale optimization framework for active RIS-assisted NLoS LEO satellite communications, aiming to enhance system performance and reduce energy consumption through joint beamforming and direction vector design.

Contribution

It introduces a novel three-timescale optimization framework and a two-layer solution for active RIS in LEO satellite communications, addressing energy efficiency and performance.

Findings

Improved system achievable rate with active RIS deployment.

Significant reduction in energy consumption through optimized switching.

Effective joint design of beamforming and RIS direction vectors.

Abstract

In this letter, we study an active reconfigurable intelligent surfaces (RIS) assisted Low Earth orbit (LEO) satellite communications under non-line-of-sight (NLoS) scenarios, where the active RIS is deployed to create visual line-of-sight links for reliable communication. To address the challenges of high energy consumption caused by frequent beamforming updates in active RIS, we propose a three-timescale optimization framework that jointly designs the transmit beamforming, RIS beamforming, and RIS direction vectors based on their characteristics. The goal is to maximize the system achievable rate while reducing energy consumption by controlling the RIS beamforming switching frequency. Then, a two-layer solution framework is developed, incorporating fractional programming (FP), alternating optimization (AO), successive approximation (SCA), and penalty-based methods, to obtain the optimized solution. Simulation results demonstrate that the proposed scheme can effectively improve system performance and reduce the energy consumption of the active RIS.