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....

Cognitive satellite terrestrial networks have received considerable attention as a promising candidate to address the spectrum scarcity problem in future wireless communications. When act cognitive users networks, power control is significant research challenge uplink case, especially for real-time applications. We propose two optimal schemes maximizing delay-limited capacity and outage capacity, respectively, which are useful performance indicators From long-term short-term aspects, average...

To improve the efficiency of on-board resources utilization, two joint power and bandwidth allocation schemes are proposed to optimize timeslot for beam-hopping user downlinks smart gateway system. By decomposing two-variable optimization problem into single variable problems, is solved effectively. Moreover, novel algorithms solve subproblems. Extensive simulation results demonstrate that resource utilization can be effectively improved with in contrast conventional scheme.

To address the spectrum scarcity in future satellite communications, employing cognitive technique systems is considered as a promising candidate, which leads to an advanced architecture known terrestrial networks. Power control significant research challenge networks, especially when perfect channel state information (CSI) of or links unavailable. In this context, we investigate impact imperfect CSI both desired link and harmful interference on power scheme By adopting pilot-based...

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),...

The incorporation of the cognitive radio (CR) technique into satellite communications is considered a promising approach to addressing spectrum scarcity. It constitutes an advanced infrastructure known as terrestrial network (CSTN). This letter deals with deployment issue in CSTNs by employing statistical modeling practical propagation phenomena. Particularly, property interference level at primary user owing CR characterized closed form for scenario. Moreover, specific exclusion zone inside...

This paper proposes novel satellite-based wireless sensor networks (WSNs), which integrate the WSN with cognitive satellite terrestrial network. Having ability to provide seamless network access and alleviate spectrum scarcity, are considered as a promising candidate for future emerging requirements of ubiquitous broadband applications increasing demand spectral resources. With environmental energy cost concerns in communication systems, explicit on efficient resource allocation have also...

Low Earth Orbit (LEO) satellites have appealing characteristics that make them most adequate for the provision of real-time interactive multimedia service. The flexibility and anti-jamming performance system can be improved significantly by introducing inter-satellite links (ISLs). However, fixed power allocation ISLs may result in waste resources due to high speed movement LEO satellites. Meanwhile, with development global navigation satellite systems, easily provided According this, we...

This paper presents a cognitive satellite communication based wireless sensor network, which combines the network and terrestrial network. To address conflict between continuously increasing demand spectrum scarcity in space becomes promising candidate for future hybrid networks. With higher transmit capacity networks, explicit concerns on efficient resource allocation have gained more attention. In this background, we propose sensing-based dynamic sharing scheme user, is able to maximize...

A new method of burst DSSS signal tracking based on Kalman filter is proposed, which uses two filters to deal with code and carrier respectively. model built the condition improving accuracy optimization are analyzed. The performance for in low Signal-to-Noise Ratio simulated, shows influence that data length signal-to-noise ratio have accuracy.

Broadband satellites, operating at Ka band and above, are playing more important roles in future satellite networks. Meanwhile, rain attenuation is the dominant impairment these bands. In this context, a dynamic power allocation scheme based on prediction proposed. By scheme, system can dynamically adjust allocated according to time-varying predicted attenuation. Extensive simulation results demonstrate improvement of over static allocation. It be concluded that capacities match traffic...