Efficient frequency reusing schemes with multibeam satellite systems can be considered as a promising means of providing high-quality services expensive and limited bandwidth resources. This letter considers integrated terrestrial systems, where the same bands are reused in beams cells. In such condition, we propose an efficient power resource allocation scheme to minimize inter-component interference while maximum throughput is provided users. The proposed consists two simple linear machine...

Non-terrestrial network (NTN) services using low-Earth-orbit (LEO) satellites are expanding. Interference management of NTN with other terrestrial wireless is emerging as a critical issue owing to the inherent international and vast coverage nature NTN. This study develops multi-agent deep reinforcement learning (DRL) framework establish multi-beam uplink channel allocation strategy that minimizes interference incumbent stations under given quality service (QoS) constraints. We propose novel...

We investigate effective interference management for Low Earth Orbit (LEO) satellite networks that provide downlink services to ground users and share the same frequency spectrum range. Since there are multi-group LEO satellites with different constellation orbits, will experience time-varying due overlapping of main/side lobes beams, which becomes even challenging when interfering cannot communicate directly. To address problem, we consider two groups communication service in area, while...

HAPS (high altitude platform station) is allowed to be used as a base station provide IMT-2000 service. ITU-R has been requested conduct studies, matter of urgency, on the feasibility utilizing system One most important parts above studies interference analysis, since should not cause harmful cellular system. On sharing problems between two systems, self from adjacent cells in must considered well In this paper, we estimated mobile by power, and finally carrier power ratio (C/I) with various...

Co-existence of various wireless systems may cause frequency interference problems. For this reason, sharing studies play a very important role in order to use limited spectrum resources efficiently. Because satellite system covers global area nature, the between and terrestrial is essential. using Ka bands, we can increase efficiency by considering off- axis angles earth station antennas. In paper, demonstrate analysis results separation distance with random height. By these results, design...

Interference scenarios and a methodology between mobile-satellite service (MSS) system terrestrial mobile (MS) in co-frequency environment are established. Taking into account practical deployment situation for both systems, computational simulation of interference terms the percentage increase equivalent satellite link noise temperature (DeltaT/T) ratio carrier power to (C/I) is performed evaluate from MS MSS system. The results could be used planning an without unacceptable impact MS.

Satellite systems can efficiently utilize expensive and limited bandwidth power resources, by reusing frequency bands over multibeams with provision of optimum resource allocation. This paper provides comparative analysis on the allocation schemes for multibeam satellite under interference-limited condition. After reviewing recent works machine learning-aided schemes, we propose a new idea to enhance performance. The performance estimation results investigated in this reveal that proposed...

Studies on frequency sharing techniques have been conducted for the efficient utilization of limited resource. In satellite communications, with other services is important because service coverage generally very wide and overlaps those wireless services. This paper introduces a new method to mitigate interference into terrestrial stations from Earth station in same band by means segmentations which are portions overall operation divided reuse factor. We consider multi-beam system, where...

We study downlink spectrum sharing in low earth orbit (LEO) satellite networks, where wide beam coverage and side lobe make it hard to manage mutual interference between satellites. As a first step, we consider two-satellite system of control satellite, which share the same frequency range are located close enough have each other. investigate resource allocation strategy for maximize its throughput performance while satisfying constraints. Assuming that has no prior knowledge about behavior...

This paper reviews regulatory status for high altitude platform station (HAPS) mainly focusing on frequency bands identified user links and considered the use by gateway links. One of pending issues sharing HAPS with other radiocommunication services is consideration interference impact a space due to uplinks. Taking into account system characteristics practical deployment scenarios in fixed service (FS) fixed-satellite (FSS) system, we evaluated from uplinks FSS uplink.

In this article, we propose a multi-agent deep reinforcement learning (MADRL) framework to train multiple access protocol for downlink low earth orbit (LEO) satellite networks. By improving the existing learned protocol, emergent random channel (eRACH), our proposed method, coined centralized and compressed signaling eRACH (Ce2RACH), can mitigate inter-satellite interference by exchanging additional messages jointly through MADRL training process. Simulations demonstrate that Ce2RACH...

Summary This paper introduces four proposals to enhance physical layer security (PLS) in low Earth orbit (LEO) satellite systems. The first proposal leverages the Alamouti code aided by artificial noise (AN) and involves collaborative use of two LEO satellites, ensuring secure downlink transmission. Its efficiency is further enhanced when implementing a power‐balanced code. second PLS capitalizes on an reconfigurable intelligent surface (RIS) introduce interference potential eavesdroppers....

This paper addresses the analysis of interference produced between non-GSO satellite system and FS operating in same frequency. Simulations performed for two different downlink scenarios. The results are given terms epfd I/N. In first scenario, simulation show that amount was calculated by proposed method is larger than typical method. result can be used to define effective criteria protection from aggregation system. second scenario calculates earth station link according radius area....

Interference scenario and methodology between an earth station (ES) of fixed-satellite service (FSS) a fixed wireless system (FWS) in the terrestrial (FS) co-channel environment X-band are established. Taking into account path loss two systems long-term short-term protection criteria for FWS, we performed computational simulation to obtain required separation distance adequate FWS. The results would be useful when considering new frequency allocations FSS which FS has been allocated planning...

In the frequency sharing situation between multi-beam satellite system and terrestrial radio system, spectral efficiency would be enhanced by reuse scheme of two systems. However, interference problem is also occurred since same bands are used both in a spot beam cell Earth stations adjacent beams. Because worse at border area cell, exclusion concept adopted to reduce but it makes degradation limiting possible sub-bands system. This paper considers optimum size taking into account scenario....

The Earth Station in Motion (ESIM) system is one of the most modern satellite systems, providing high-speed and high-capacity communication with mobility. To operate ESIM Ka-band, a compatibility study incumbent services should be considered for protection existing services. This paper provides methodology to assess interference from an FS same taking into account antenna pointing errors occurred inevitably by tracking ESIM. Based on point-to-point scenario, simulation results show...

Modern satellite systems utilize high frequency bands usually above 15 GHz to provide speed transmission services, and adopt adaptive modulation coding (AMC) schemes in order countermeasure serious rain fading occurred the utilized bands. This paper introduces an efficient scheme by using rateless codes. The proposed utilizes existing AMC with LDPC codes, thus it can be easily combined standards. error rate spectral efficiency performance simulation results demonstrate enhancement over a...

Summary The radiocommunication part of the International Telecommunication Union (ITU‐R) establishes standards for wireless communications. Recommendation ITU‐R S.1062 specifies performance objectives satellite communication systems providing constant bit rate service. However, this is not applicable to most modern utilizing adaptive coding and modulation (ACM) schemes compensate channel impairments, especially operating in high frequency bands. For reason, recently developed S.2131 that...

CW (continuous wave) 도플러 레이다는 카메라와 달리 사생활 침해 문제를 해결할 수 있고, 비접촉 방식으로 신호를 얻을 있다는 장점이 있다. 따라서, 본 논문에서는 레이다를 이용한 사람 행동 인식 시스템을 제안하고, 가속을 위한 하드웨어 설계 및 구현 결과를 제시한다. 사람의 연속된 동작에 대한 측정한다. 이에, 동작 분류를 단일 스펙트로그램을 얻기 위해 운동 동작의 횟수를 세는 기법을 제안하였다. 또한, 연산의 복잡도와 메모리 사용량을 최소화하기 분류에 BNN (binarized neural network)을 사용하였고, 검증 결과 94%의 정확도를 보임을 확인하였다. BNN의 복잡한 연산을 가속하기 FPGA를 이용하여 가속기가 구현되었다. 제안된 시스템은 logic 7,673개, register 12,105개, combinational ALUT (adaptive look up table) 10,211개, block memory 18.7 Kb를 사용하여...