Joint and Streamwise Distributed MIMO Satellite Communications with Multi-Antenna Ground Users
Parisa Ramezani, Emil Bj\"ornson

TL;DR
This paper explores distributed MIMO satellite communication strategies with multi-antenna ground users, proposing joint and streamwise transmission modes, optimizing spectral efficiency, and demonstrating significant performance improvements through simulations.
Contribution
It introduces a novel iterative transceiver design for joint transmission and an eigenmode-based association for streamwise transmission, addressing fronthaul constraints in satellite MIMO systems.
Findings
Joint transmission achieves higher spectral efficiency with full fronthaul.
Streamwise transmission reduces fronthaul load with near-optimal performance under certain conditions.
Numerical results show substantial gains over conventional methods.
Abstract
We consider a low Earth orbit downlink communication, where multiple satellites jointly serve multi-antenna ground users, transmitting multiple spatial streams per user. Using a line-of-sight-dominant satellite channel model with statistical channel state information, including angular information and large-scale fading, we study two distributed transmission modes with different fronthaul requirements. First, for joint transmission, where all satellites transmit all user streams, we formulate a sum spectral efficiency (SE) maximization problem under general convex power constraints and address the intractability of the exact ergodic SE expression by adopting a tractable approximation. Exploiting the equivalence between sum SE maximization and weighted sum mean square error minimization, we derive a novel iterative transceiver design. Second, to reduce fronthaul load, we propose…
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Taxonomy
TopicsSatellite Communication Systems · Advanced MIMO Systems Optimization · Advanced Wireless Network Optimization
