In recent years, low earth orbit (LEO) satellite constellation systems have been developed rapidly. However, the scarcity of spectrum resources has become one major obstacles to this trend. LEO communication sharing incumbent geostationary (GEO) system is a feasible way alleviate scarcity. Therefore, it practical significance study optimization allocation (RA) in scenario. This paper focuses on RA problem that satellites share GEO high throughput satellite's beam-hopping (BH) manner. The...

With the development of satellite communication, number satellites in space continuously increases. However, available spectrum resources are scarce. To address scarcity, sharing between different communication systems is a promising option. In this paper, novel cognitive network with geostationary earth orbit (GEO) and low (LEO) broadband studied downlink case. First, we present general interference analysis model simplify it by transforming spatial dimension into time according to motion....

The mega-low Earth orbit (LEO) satellite constellation is pivotal for the future of Internet and 6G networks. In mega-LEO system (MLSCS), which spatial distribution satellites, global users, their services, along with utilization spectrum resources, significantly impacts resource allocation scheduling. This paper addresses challenge effectively allocating resources based on service distribution, particularly in hotspot areas where user demand concentrated, to enhance efficiency. We propose a...

The beam-hopping (BH) technology applied to low earth orbit (LEO) satellite communication networks is a superior choice, but the long transmission delay partly caused by data packets waiting in queue of transponders will seriously affect user experience. To shorten packet queueing delay, this paper, we propose an optimization method dynamic beam position division for LEO BH systems. Firstly, analyze problem satellites find out factors related and that number positions negatively correlated...

Multi-layer satellite networks (MLSNs) is of great potential for the integrated 5G to provide diversified services. However, MLSNs confront frequency interference coordination problem between systems in different orbits. This paper investigates a joint user pairing and power allocation scheme non-orthogonal multiple access (NOMA)-based geostationary earth orbit (GEO) low (LEO) network. Specifically, novel NOMA framework with two uplink receivers, i.e. GEO LEO satellites established where...

Power control plays a significant role in cognitive networks, which promotes the spectrum sharing between heterogeneous systems. This letter presents mathematical model for low earth orbit (LEO) satellite constellation with terrestrial takes dynamic characteristics of LEO into consideration. Two optimal power schemes are proposed from long-term and short-term perspectives, aims to maximize delay-limited capacity minimize outage probability, respectively. Solutions optimization problems...

Having the ability to provide seamless coverage and alleviate frequency scarcity, cognitive satellite terrestrial network becomes a promising candidate for future communication networks. In network, spectrum sensing plays an important role in detecting channel state opportunistic utilization, where cooperative is employed improve performance. Additionally, it critical battery-powered mobile terminals diminish energy consumption costs. this regard, paper proposes novel sensing-based (SCSTN),...

To increase system capacity in the full bandwidth beam hopping satellite systems, a resource allocation algorithm based on spatial clustering is proposed. According to proportion of required available resources, allocates corresponding amount timeslots each beam, increasing premise satisfying relative fairness. A distance threshold calculated that when between beams greater than threshold, influence interference signal quality can be ignored. Thus, controlling illuminated simultaneously...

Multilayer satellite networks (MLSNs) are viewed as a promising framework of the future communication by realizing cooperative among satellites in different orbits. In this article, we introduce nonorthogonal multiple access (C-NOMA) scheme into two-layer geostationary Earth orbit/low orbit network frequency coexistence scenario and investigate performance considered network. Taking account dynamic properties channel characteristic nodes, first establish generic architecture then obtain...

With the growing demand, Wireless Multimedia Sensor Networks (WMSNs) play an increasingly important role, which enhances capacity of typical (WSNs). Additionally, integrating satellite systems into WMSNs brings about beneficial synergy, especially in rural and sparsely populated areas. However, available spectrum resource is scarce, contradicts high-speed content required for multimedia. Cognitive radio a promising solution to address conflict. In this context, we propose novel...

Space Information Network (SIN) has recently become prevalent as a promising approach to solve the collaboration difficulty among current space programs. However, due large scale, high component complexity and dynamic characteristics of SIN, task proper SIN architecture design is challenging. We propose novel which composed Geostationary Earth Orbit (GEO) satellites backbone network nodes, Low (LEO) or Incline Geosynchronous (IGSO) enhanced coverage altitude platforms meet service...

We propose a new data-aided algorithm for carrier frequency estimation in burst mode phase shift keying (PSK) transmissions. It has feedforward structure that is easy to implement digital form. Its range large, about /spl plusmn/50% of the symbol rate and its accuracy close modified Cramer-Rao bound (MCRB) low signal-to-noise ratio.

This article investigates the capacity problem of an integrated remote wireless sensor and satellite network (IWSSN) in emergency scenarios. We formulate a general model to evaluate capacity. Compared most existing works for ground networks, proposed is time varying space oriented. To capture characteristics practical network, we sift through major capacity-impacting constraints analyze influence these constraints. Specifically, combine geometric orbit tool kit (STK) engineering software...

In LEO satellite constellation communication system, the routing strategy becomes a big challenge for movement between satellites. According to researching on 24/3/1 walker with inter-orbit ISLs and intra-orbit ISLs, two optimization scenarios based ISL state topology snapshot are suggested. At same time, some valuable conclusions provided according computer simulation about MDA(Minimum Distance Algorithm).

How to precisely detect co-channel narrow band interferences using single threshold is a challenge for satellite transponder spectrum monitor, especially in the condition of many signals which parameters are different.A new method interference detection communication proposed based on mathematical morphology.The paper uses an improved morphological gradient filter belongs image and graphics filed deal with data that viewed as one-dimensional gray-scale image, then search edges position...

It's a challenging task to design high performance modulation for satellite and space communications due the limited power bandwidth resource. Constant envelope is an attractive scheme be used in such cases their needlessness of input back-off about 2~3 dB avoidance nonlinear distortion induced by amplifier. The Feher quadrature phase shift keying (FQPSK) has least fluctuation 0.18 (quasi constant envelope) can further improved. This paper improves FQPSK defining set new waveform functions,...

With the growing demand, wireless sensor networks (WSNs) play an increasingly important role in many fields. The focus has been on deploying Luby transform (LT) codes WSNs because of their inherent advantages erasure channels. Since most data transmitted by are small, Gaussian elimination (GE) decoding algorithm is highly attractive. In this paper, we investigate performance analysis and code design methods for LT under GE algorithm. First, analytical expressions probability detailed two...

In traditional wireless broadcast networks, a corrupted packet must be retransmitted even if it has been lost by only one receiver. Obviously, this is not bandwidth-efficient for the receivers that already hold packet. Therefore, important to develop method realise efficient transmission. Network coding promising technique in scenario. However, none of proposed schemes achieves both high transmission efficiency and low computational complexity simultaneously so far. To address problem, novel...

Due to the long propagation distance between spacecraft and Earth station high power efficiency is more important for deep space communication than others systems. One novel coded modulation scheme based on AR4JA code FQPSK (Feher's QPSK) proposed out in this paper, which can alleviate challenge of huge loss communications. The approach utilizes property that enables at very low signal noise rate constant envelope overcome nonlinear impact amplifier. At receiver, large gain be attained by...

The satellite orbit parameters in the ephemeris and location of land receiver were studied. Universal mathematic models Doppler frequency-shift deduced using geometric vector. frequency between satellites receivers relations elevation angle are analyzed low, middle high orbits, algorithm constructed. simulation results show effectiveness universality models, it could be used for estimation compensation frequency-shift.

There are numerous terminals in the satellite Internet of Things (IoT). To save cost and reduce power consumption, system needs to catch characteristics low consumption light control. The regular random access (RA) protocols may generate large amounts collisions, which degrade throughout severally. near-far effect control technologies not applicable capture obtain difference, resulting collisions that cannot be separated. In fact, optimal design at receiving end can also realize condition...