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http://dx.doi.org/10.3837/tiis.2020.09.019

Enhancing Irregular Repetition Slotted ALOHA with Polarization Diversity in LEO Satellite Networks  

Su, Jingrui (The State Key Laboratory of Integrated Service Networks, Xidian University)
Ren, Guangliang (The State Key Laboratory of Integrated Service Networks, Xidian University)
Zhao, Bo (The State Key Laboratory of Integrated Service Networks, Xidian University)
Ding, Jian (The State Key Laboratory of Integrated Service Networks, Xidian University)
Publication Information
KSII Transactions on Internet and Information Systems (TIIS) / v.14, no.9, 2020 , pp. 3907-3923 More about this Journal
Abstract
An enhanced irregular repetition slotted ALOHA (IRSA) protocol is proposed by using polarization characteristic of satellite link and MIMO detection in low earth orbit (LEO) satellite networks, which is dubbed polarized MIMO IRSA (PM-IRSA). In the proposed scheme, one or two packets in one slot can be decoded by employing polarized MIMO detection, and more than two collided packets in multiple slots which can construct the virtual MIMO model can be decoded by the MIMO detection algorithm. The performance of the proposed scheme is analyzed with the density evolution (DE) approach and the degree distribution is optimized to maximize the system throughput by using a differential evolution. Numerical results certify our analysis and show that the normalized throughput of the proposed PM-IRSA can achieve 1.89 bits/symbol.
Keywords
Random access; IRSA; satellite networks; Internet of Things (IoT); polarization diversity; virtual MIMO;
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