Low Earth Orbit (LEO) satellites undergo a period of rapid development driven by ever-increasing user demands, reduced costs, and technological progress. Since there is lack literature on the security reliability issues LEO Satellite Communication Systems (SCSs), we aim to fill this knowledge gap. Specifically, critically appraise inherent characteristics SCSs elaborate their requirements. In light this, further discuss vulnerabilities, including potential attacks launched against them...

<div>In view of the development status security LEO satellite communication system, a comprehensive review, induction, and summary is carried out.<br></div>

Reconfigurable intelligent surface (RIS) assisted millimeter wave (mmWave) communications has been envisioned as a prominent technology for future wireless networks, since it is capable of simultaneously providing abundant spectrum resources and favorable propagation environments. The small wavelength at mmWave bands also enables the widespread use large antenna arrays, which hybrid beamforming structure emerged cost-effective solution. In this paper, we aim to minimize sum-mean-square-error...

The Internet of Remote Things (IoRT) supported by low-Earth orbit (LEO) satellites is becoming indispensable for remote sensing and it will play an important role in the forthcoming sixth-generation (6G) communication network. In exploring its applications mining smart grid, etc., found that implementation IoRT faces challenges, including limited energy supplies, high-mobility, security vulnerabilities. To address these we propose employing collaborative LEO to enable secure green IoRT. By...

In this work, a reconfigurable intelligent surface (RIS)-based multi-input–multi-output (MIMO) covert communication system is considered and studied for Internet of Things (IoT) networks, while the joint optimization precoder RIS reflection phase carried out to improve performance. To solve problem, we first derive optimal signal-interference-to-noise ratio under transmit power constraints. Then, simplify optimized function use an iterative algorithm determine shift precoding in continuous...

Satellite communication plays an increasingly important role in global wireless systems, which leads to rising concerns about the secure transmission of confidential information. In this article, we investigate secrecy outage performance uplink satellite-aerial system, aerial platform (S) transmits its information over a legitimate satellite(D), while eavesdropping satellite (E) trying overhear delivery between S and D. Specifically, considering randomness positions D E employing geometric...

This article presents a novel noncoherent multisatellite weak signal acquisition scheme by aggregating the observations at multiple low-Earth orbit (LEO) satellites. Existing aggregation schemes rely on exhaustive search over grids Earth surface to compensate for differences in delay and Doppler frequency shift experienced different satellites, which have high-computational complexity due wide coverage of LEO Motivated this observation, we propose directly work with satellites'...

<div>In view of the development status security LEO satellite communication system, a comprehensive review, induction, and summary is carried out.<br></div>

Multi-Carrier Direct-Sequence Code Division Multiple Access (MC-DS-CDMA) has gradually been widely used due to its advantages of high transmission rate and multi-user access. The burst frame synchronization detection indicates the start position information, which is an important step in MC-DS-CDMA receiver. In this paper, we propose a time-frequency two-dimensional model, with coherent accumulation time dimension non-coherent frequency for enhancing performance multipath channels....

Low Earth Orbit (LEO) satellites are being extensively researched in the development of secure Internet Remote Things (IoRT). In scenarios with miniaturized terminals, limited transmission power and long distance often lead to low Signal-to-Noise Ratio (SNR) at satellite receiver, which degrades communication performance. A solution address this issue is utilization cooperative satellites, can combine signals received from multiple thereby significantly improve SNR. However, order maximize...

The Internet of Remote Things (IoRT) supported by Low Earth Orbit (LEO) satellites has provided great convenience to specific intelligent productions, such as smart ocean and remote mining. To enhance system security reduce the probability interception, terminal transmission power is limited a lower level, resulting in satellite receivers operating under low signal-to-noise ratio (SNR) conditions. overcome this challenge, communication multiple collaborative LEO proposed improve SNR through...

Low Earth Orbit (LEO) satellites undergo a period of rapid development driven by ever-increasing user demands, reduced costs, and technological progress. Since there is paucity literature on the security reliability issues LEO Satellite Communication Systems (SCSs), we aim to fill this knowledge gap. Specifically, critically appraise inherent characteristics SCSs elaborate their requirements. In light this, further discuss vulnerabilities, including potential attacks launched against them...