Massive MIMO-OTFS-Based Random Access for Cooperative LEO Satellite Constellations

Doppler effect; message passing; OTFS; random access; Satellite communications; Computer Networks and Communications; Electrical and Electronic Engineering

Abstract :

[en] This paper investigates joint device identification, channel estimation, and symbol detection for cooperative multi-satellite-enhanced random access, where orthogonal time-frequency space modulation with the large antenna array is utilized to combat the dynamics of the terrestrial-satellite links (TSLs). We introduce the generalized complex exponential basis expansion model to parameterize TSLs, thereby reducing the pilot overhead. By exploiting the block sparsity of the TSLs in the angular domain, a message passing algorithm is designed for initial channel estimation. Subsequently, we examine two cooperative modes to leverage the spatial diversity within satellite constellations: The centralized mode, where computations are performed at a high-power central server, and the distributed mode, where computations are offloaded to edge satellites with minimal signaling overhead. Specifically, in the centralized mode, device identification is achieved by aggregating backhaul information from edge satellites, and channel estimation and symbol detection are jointly enhanced through a structured approximate expectation propagation (AEP) algorithm. In the distributed mode, edge satellites share channel information and exchange soft information about data symbols, leading to a distributed version of AEP. The introduced basis expansion model for TSLs enables the efficient implementation of both centralized and distributed algorithms via fast Fourier transform. Simulation results demonstrate that proposed schemes significantly outperform conventional algorithms in terms of the activity error rate, the normalized mean squared error, and the symbol error rate. Notably, the distributed mode achieves performance comparable to the centralized mode with only two exchanges of soft information about data symbols within the constellation.

Disciplines :

Electrical & electronics engineering

Author, co-author :

Shen, Boxiao ; Shanghai Jiao Tong University, Department of Electronic Engineering, Shanghai, China

Wu, Yongpeng ; Shanghai Jiao Tong University, Department of Electronic Engineering, Shanghai, China

Gong, Shiqi ; Beijing Institute of Technology, School of Cyberspace Science and Technology, The School of Information and Electronics, Respectively, Beijing, China

Liu, Heng ; Beijing Institute of Technology, School of Cyberspace Science and Technology, The School of Information and Electronics, Respectively, Beijing, China

Ottersten, Bjowrn ; University of Luxembourg, Interdisciplinary Center for Security, Reliability and Trust (SnT), Luxembourg City, Luxembourg

Zhang, Wenjun ; Shanghai Jiao Tong University, Department of Electronic Engineering, Shanghai, China

OTTERSTEN, Björn ; University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > PI Ottersten

External co-authors :

yes

Language :

English

Title :

Massive MIMO-OTFS-Based Random Access for Cooperative LEO Satellite Constellations

Publication date :

2024

Journal title :

IEEE Journal on Selected Areas In Communications

ISSN :

0733-8716

Publisher :

Institute of Electrical and Electronics Engineers Inc.

Pages :

1-1

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://xplorestaging.ieee.org/ielx8/49/5594698/10680158.pdf?arnumber=10680158

Funders :

Fundamental Research Funds for the Central Universities
National Science Foundation
111 project
STCSM
FNR research

Funding text :

The work of Y. Wu is supported in part by the Fundamental Research Funds for the Central Universities, National Science Foundation (NSFC) under Grant 62122052 and 62071289, 111 project BP0719010, and STCSM 22DZ2229005; The work by B. Ottersten is funded in part by the FNR research grant 18014377. (Corresponding author: Yongpeng Wu).

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since 15 November 2024

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