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What Roles Can Spatial Modulation and Space Shift Keying Play in LEO Satellite-Assisted Communications?

Chaorong Zhang, Qingying Wu, Yuyan Liu, Benjamin K. Ng, Chan-Tong Lam

TL;DR

The paper addresses the need for increased data rate and robustness in LEO satellite-assisted MIMO links by applying spatial modulation (SM) and space shift keying (SSK). It designs LEO-SM and LEO-SSK, derives spectral efficiency (SE) expressions and detection-complexity metrics, and validates performance through Monte Carlo simulations under perfect and imperfect CSI. Results show that LEO-SM provides higher SE and typically better BER performance, especially under CSI imperfections, at the cost of greater ML detector complexity, while LEO-SSK offers lower complexity with a trade-off in SE. The work demonstrates the viability of SM/SSK techniques for future 6G LEO networks, highlighting the balance between throughput, robustness, and processing burden in satellite-enabled wireless systems.

Abstract

In recent years, the rapid evolution of satellite communications play a pivotal role in addressing the ever-increasing demand for global connectivity, among which the Low Earth Orbit (LEO) satellites attract a great amount of attention due to their low latency and high data throughput capabilities. Based on this, we explore spatial modulation (SM) and space shift keying (SSK) designs as pivotal techniques to enhance spectral efficiency (SE) and bit-error rate (BER) performance in the LEO satellite-assisted multiple-input multiple-output (MIMO) systems. The various performance analysis of these designs are presented in this paper, revealing insightful findings and conclusions through analytical methods and Monte Carlo simulations with perfect and imperfect channel state information (CSI) estimation. The results provide a comprehensive analysis of the merits and trade-offs associated with the investigated schemes, particularly in terms of BER, computational complexity, and SE. This analysis underscores the potential of both schemes as viable candidates for future 6G LEO satellite-assisted wireless communication systems.

What Roles Can Spatial Modulation and Space Shift Keying Play in LEO Satellite-Assisted Communications?

TL;DR

The paper addresses the need for increased data rate and robustness in LEO satellite-assisted MIMO links by applying spatial modulation (SM) and space shift keying (SSK). It designs LEO-SM and LEO-SSK, derives spectral efficiency (SE) expressions and detection-complexity metrics, and validates performance through Monte Carlo simulations under perfect and imperfect CSI. Results show that LEO-SM provides higher SE and typically better BER performance, especially under CSI imperfections, at the cost of greater ML detector complexity, while LEO-SSK offers lower complexity with a trade-off in SE. The work demonstrates the viability of SM/SSK techniques for future 6G LEO networks, highlighting the balance between throughput, robustness, and processing burden in satellite-enabled wireless systems.

Abstract

In recent years, the rapid evolution of satellite communications play a pivotal role in addressing the ever-increasing demand for global connectivity, among which the Low Earth Orbit (LEO) satellites attract a great amount of attention due to their low latency and high data throughput capabilities. Based on this, we explore spatial modulation (SM) and space shift keying (SSK) designs as pivotal techniques to enhance spectral efficiency (SE) and bit-error rate (BER) performance in the LEO satellite-assisted multiple-input multiple-output (MIMO) systems. The various performance analysis of these designs are presented in this paper, revealing insightful findings and conclusions through analytical methods and Monte Carlo simulations with perfect and imperfect channel state information (CSI) estimation. The results provide a comprehensive analysis of the merits and trade-offs associated with the investigated schemes, particularly in terms of BER, computational complexity, and SE. This analysis underscores the potential of both schemes as viable candidates for future 6G LEO satellite-assisted wireless communication systems.
Paper Structure (10 sections, 20 equations, 5 figures)

This paper contains 10 sections, 20 equations, 5 figures.

Table of Contents

  1. Introduction
  2. System Model
  3. Encoding Process
  4. Channel Model
  5. Transmission and Detection
  6. Imperfect CSI Estimation
  7. Detection Complexity
  8. Spectral Efficiency
  9. Theoretical and Simulation Results
  10. Conclusion

Figures (5)

  • Figure 1: System model of the LEO-SM and LEO-SSK schemes.
  • Figure 2: Encoding processing in the LEO-SM and LEO-SSK schemes.
  • Figure 3: BER performance of the LEO-SM, LEO-SSK, and Trad. LEO schemes with $N_r=2$ and different $\delta_{e2}^2$.
  • Figure 4: BER performance of the LEO-SM and LEO-SSK schemes with different $N_r$ and $m$.
  • Figure 5: Complexity and SE of the LEO-SM, LEO-SSK, and Trad. LEO schemes.