Enhancing Irregular Repetition Slotted ALOHA with Polarization Diversity in LEO Satellite Networks
- Resource Type
- Article
- Authors
- Jingrui Su; Guangliang Ren; Bo Zhao; Jian Ding
- Source
- KSII Transactions on Internet and Information Systems (TIIS). Sep 30, 2020 14(9):3907
- Subject
- Random access
IRSA
satellite networks
Internet of Things
IoT
polarization diversity
virtual MIMO
- Language
- English
- ISSN
- 1976-7277
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.