A Pragmatic Approach to Massive MIMO for Broadband Communication Satellites

Piero Angeletti,Riccardo De Gaudenzi

doi:10.1109/access.2020.3009850

Piero Angeletti, Riccardo De Gaudenzi

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https://doi.org/10.1109/access.2020.3009850

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Journal: IEEE Access	Publication Date: Jan 1, 2020
Citations: 58	License type: CC BY 4.0

Affiliation: European Space Research and Technology Centre

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In this paper, we analyze the performance of Massive Multiple Input Multiple Output (M-MIMO) techniques aiming at increasing the throughput of broadband satellites. In particular, we investigate a “pragmatic” approach to the design of the M-MIMO to ease its implementation both at system and satellite payload level. We compare the performance of optimized classical Minimum Mean Square Error (MMSE), Zero Forcing (ZF), Matched Filter (MF) schemes with the proposed “pragmatic” M-MIMO one dubbed fixed Multi-Beam (MB). To further boost the M-MIMO performance, a novel radio resource management approach based on Mixed Integer Quadratic Programming (MIQDP-RRM) is proposed. The adoption of MIQDP-RRM is shown to greatly enhance the M-MIMO throughput performance. It is shown that the MB scheme closely approximate the MF, ZF and MMSE performance with a much simpler active antenna-based payload architecture and without requiring any user channel estimation. The MB MIQDP-RRM M-MIMO pragmatic solution allows to achieve higher satellite broadband throughput compared to a conventional four colors frequency reuse scheme (CFR) with affordable complexity for both space and ground segments. At the same time we show that by non-conventional CFR multi-beam array design, the performance gap compared to MB MIQDP-RRM M-MIMO can be significantly reduced.

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AND MOTIVATIONRecent years have witnessed a strong impulse in adopting Massive Multiple input Multiple Output (M-MIMO) in wireless networks [1], [2]
2) MEDIUM SIZE ARRAY WITH RELAXED SPACING to what was done for the M-MIMO case, we have investigated the impact of a relaxation of the Direct Radiating Antenna (DRA) feed elements distance to reduce the DRA complexity
We remark that the MB M-MIMO approach closely follows the Matched Filter (MF) performance

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AND MOTIVATIONRecent years have witnessed a strong impulse in adopting Massive Multiple input Multiple Output (M-MIMO) in wireless networks [1], [2]. Despite the wide literature related to M-MIMO for terrestrial networks, much less attention has been devoted to its possible exploitation in the forward link of satellite systems. Satellite specific issues like multicasting, multiple gateways, channel estimation have been reported in the literature [3]–[8]. The fact that current satellite forward link standards like DVBS2X [9], are requiring to multiplex packets belonging to different users in the same physical layer frame, has an important impact on precoding performance due to this ‘‘multicasting’’ effect. Techniques to partially mitigate this problem, based on multiplexing on the same physical layer frame packets with similar channel characteristics have been devised in [5]

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