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arXiv 2211.04036eess.SP
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基于干扰的LEO卫星物联网网络性能分析

Performance Analysis of LEO Satellite-Based IoT Networks in the Presence of Interference

Ayush Kumar Dwivedi, Sachin Chaudhari, Neeraj Varshney, Pramod K. Varshney

AI总结:

本文提出一种星中星拓扑的LEO卫星物联网网络,通过多卫星共享信道与放大转发中继,结合最大比合并及干扰消除方案,在随机几何建模下分析中断概率,实现无需用户协调的突发传输。

摘要:

本文提出了一种利用巨型低地球轨道星座的物联网(IoT)网络的星中星拓扑结构。所提出的拓扑结构使物联网用户能够通过共享信道同时向多颗卫星广播其感知数据,随后通过放大转发中继将数据转发至地面站(GS)。地面站采用最大比合并对来自多颗卫星的信号进行相干合并。为了在存在干扰的情况下分析所提出拓扑的性能,本文进行了全面的中断概率(OP)分析,并假设地面站存在不完美的信道状态信息。本文采用随机几何对卫星的随机位置进行建模,使分析具有通用性且不依赖于任何特定星座。此外,本文考察了地面站处基于连续干扰消除(SIC)和捕获模型(CM)的解码方案以减轻干扰。针对基于CM的方案的平均OP以及针对SIC方案的最佳用户OP均通过解析方式推导得出。本文还给出了在高信噪比(SNR)假设下OP的简化表达式,这些表达式用于优化系统参数以实现目标OP。仿真结果与分析表达式一致,并提供了对各种系统参数(如掩蔽角、高度、卫星数量和解码顺序)影响的见解。本研究的发现表明,所提出的拓扑结构能够有效利用多颗卫星的优势来实现所需的OP,并支持物联网用户之间无需协调的突发传输,使其成为基于卫星的物联网网络的一个有吸引力的选择。

英文摘要:

This paper presents a star-of-star topology for internet-of-things (IoT) networks using mega low-Earth-orbit constellations. The proposed topology enables IoT users to broadcast their sensed data to multiple satellites simultaneously over a shared channel, which is then relayed to the ground station (GS) using amplify-and-forward relaying. The GS coherently combines the signals from multiple satellites using maximal ratio combining. To analyze the performance of the proposed topology in the presence of interference, a comprehensive outage probability (OP) analysis is performed, assuming imperfect channel state information at the GS. The paper employs stochastic geometry to model the random locations of satellites, making the analysis general and independent of any specific constellation. Furthermore, the paper examines successive interference cancellation (SIC) and capture model (CM)-based decoding schemes at the GS to mitigate interference. The average OP for the CM-based scheme and the OP of the best user for the SIC scheme are derived analytically. The paper also presents simplified expressions for the OP under a high signal-to-noise ratio (SNR) assumption, which are utilized to optimize the system parameters for achieving a target OP. The simulation results are consistent with the analytical expressions and provide insights into the impact of various system parameters, such as mask angle, altitude, number of satellites, and decoding order. The findings of this study demonstrate that the proposed topology can effectively leverage the benefits of multiple satellites to achieve the desired OP and enable burst transmissions without coordination among IoT users, making it an attractive choice for satellite-based IoT networks.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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