In this paper, we investigate the physical-layer security of cooperative communications relying on multiple two-way relays using decode-and-forward (DF) protocol in presence an eavesdropper, where eavesdropper appears to tap transmissions both source and relay. The design tradeoff be resolved is that throughput improved by invoking relaying, but secrecy wireless may degraded, since overhear signals transmitted relay nodes. We conceive artificial noise aided opportunistic selection (ANaTWORS)...

This article investigates the physical layer security for a cooperative cognitive radio (CCR) system with energy-harvesting (EH) technique, which consists of source (CS), multiple relays (CRs) and destination (CD) as well eavesdroppers (Es) who are considered to tap confidential transmission from CS via CRs CD. Both equipped energy-harvesters harvest energy surrounding frequency environment. Additionally, in order guarantee quality-of-service primary communications, transmit powers limited...

We study the physical-layer security of a cognitive radio system in face multiple eavesdroppers (EDs), which is composed secondary base station (SBS), users (SUs) as well pair primary transmitter (PT) and receiver (PR), where SUs first harvest energy from their received frequency signals transmitted by PT then communicate with SBS relying on opportunistic scheduling. consider two specific user scheduling schemes, namely, channel-aware (CaUS) energy-aware (EaUS). In CaUS scheme, an SU having...

In this paper, we study a spectrum-sharing satellite system, consisting of pair geosynchronous earth orbit (GEO) and low (LEO) constellation, where the LEO satellites perform wireless transmissions relying on shared spectrum GEO. order to characterize spectrum-utilization law GEO guide access users, propose deep learning based prediction model generate situation, termed as convolutional neural network bidirectional long short-term memory (CNN-BiLSTM). Specifically, historical occupancy data...

We investigate a satellites-based spectrum sensing system in the presence of low signal-to-noise ratio (SNR) conditions. Such SNR is also called wall energy detection (ED) method. To eliminate SNR-wall effect, we propose combined convolutional neural network and long short-term memory (C-CNN-LSTM) aided spectrum-sensing scheme. Specifically, CNN LSTM are concurrently utilized, where extracts relationships among data (SSD) received at different satellites, excavates time-domain SSD from one...

In this paper, we explore the physical-layer security in a wireless network consisting of multiple user pairs face eavesdroppers, which are deployed by an adversary for tapping confidential transmissions deliberately. We propose friendly jammer-assisted user-pair selection (FJaUPS) scheme to improve security-reliability tradeoff (SRT). Conventionally, jammer is used transmit artificial noise that specially designed onto null space main channel (spanning from source legitimate destination)...

This paper investigates the physical-layer security (PLS) of wireless transmissions with aid multiple decode-and-forward one-way relays in presence both eavesdropping attacks and channel estimation errors (CEEs). To protect transmission CEE, two opportunistic relaying schemes are conceived to upgrade PLS communications relays, namely, CEE-oriented pure relay selection (CEE-PRS) jammer-aided (CEE-JRS), respectively. Moreover, security-reliability tradeoff (SRT) is designed due that increasing...

The Internet of Things (IoT) is a burgeoning paradigm that changes our lives greatly. In many cases, IoT devices are located in remote areas, which can't be served by terrestrial access networks. As consequence, Low Earth Orbit (LEO) satellite communication system may play an important evolution 5G, and becomes paramount importance for those scenes relying on its disadvantages. Additionally, the first integration 5G also provides more technical support system. Based analysis special...

In this article, we investigate the spectrum-sharing for a space information network comprised of geostationary orbit (GEO) satellite and pair low earth (LEO) satellites, where one spectrum-sensing LEO (SLEO) is used to sense status spectrum occupancy GEO, data-transmission (DLEO) allowed access shared GEO with aid SLEO. order improve throughput DLEO satellite, sharing framework has been conceived relying on two stages. Differing from conventional scheme, ability both in overlay mode...

A spectrum-sharing satellite-ground integrated network is conceived, consisting of a pair non-geostationary orbit (NGSO) constellations and multiple terrestrial base stations, which impose the co-frequency interference (CFI) on each other. The CFI may increase upon increasing number satellites. To manage potentially severe interference, we propose to rely joint multi-domain resource aided management (JMDR-IM). Specifically, coverage overlap considered analyzed. Then, resources - including...

In this paper, we investigate a spectrum-sensing system in the presence of satellite, where satellite works as sensing node. Considering conventional energy detection method is sensitive to noise uncertainty, thus, temporal convolutional network (TCN) based designed eliminate effect uncertainty and improve performance spectrum sensing, relying on offline training online stages. Specifically, stage, data captured by sent TCN deployed gateway for purpose. Moreover, well trained utilized...

Abstract. Spatial rainfall is a key input to Distributed Hydrological Models, which the most important limitation for accuracy of hydrological models. Model performance and uncertainty could increase when rain gauge sparse. Satellite-based precipitation products would be an alternative ground-based estimates in present foreseeable future, however, it necessary evaluate before further implication. The objective this paper provide assessments of: (a) Tropical Rainfall Measuring Mission (TRMM)...

In recent years, the Internet of Things (IoT) technology has shown a good momentum development and been widely used in various fields society. Satellite IoT, as an important complement extension ground provides services areas where oceanic desert cannot build terrestrial IoT base stations. However, due to limited spectrum resources, sharing between satellite is likely be required, which will inevitably lead uplink downlink co-channel interference systems. This paper analyzes scenarios that...

In this paper, we investigate a geosynchronous earth orbit (GEO) and low (LEO) coexisting satellite communication system. To decrease the interference imposed on GEO user caused by LEO satellites, propose joint beam-management power-allocation (JBMPA) scheme to maximize signal-to-interference plus noise ratio (SINR) at user, whilst maintaining ongoing wireless links spanning from satellites their corresponding users. Specifically, first analyze overlapping coverage among obtain LEO-satellite...

We explore a satellite internet of things (SIoT) system, wherein multiple IoT users are allowed to access the SIoT in grant-free manner. Such manner may incur severe co-frequency interference (CFI), and decease user capacity terms number successfully accessing SIoT. To this end, we first design two beam preprocessing oriented grouping methods, called distribution based (UDUG) position (UPUG), respectively. With respect UDUG, propose regional statistical channel state information multi-beam...

In this study, the authors investigate physical‐layer security in a cognitive amplify‐and‐forward relay network consisting of secondary transmitter (ST) and destination (SD) with aid multiple relays (SRs) face eavesdroppers. radio networks, increasing transmit power may not always be beneficial terms improving channel capacity transmissions, which would only cause an extra interference to primary user, but also enhance possibility successfully intercepting transmissions at eavesdropper...

Due to the wide coverage of satellite communication systems, Satellite Internet Things (S-IoT) has become a new hot spot in field Things. Long Range (LoRa) signal is one main directions terrestrial because low power area network (LPWAN) characteristic. In this paper, we present earth orbit (LEO) IoT model, based on capture effect and successive interference cancellation (SIC) demodulation technology, analyze uplink performance LoRa. Furthermore, derive connection probability equation for...

In this paper, we consider a cooperative relay network consisting of source, destination, and multiple decode-and-forward (DF) relays in the presence eavesdroppers, which intend to tap confidential messages transmitted by both source relays. We propose so-called secrecy maximization oriented selection (SMORS) scheme improve physical-layer security wireless communications. SMORS scheme, with maximal rate is selected among all DF forward signal. analyze intercept probability proposed as well...

In this paper, we explore a satellite based spectrum-sensing system, where the spectrum -sensing data are used to assist sharing. However, these may be outdated due long propagation delay of links. Such incur wrong spectrum-sharing decisions, resulting in co-frequency interference. To avoid negative effect caused by delay, propose joint short-term memory and autoregressive moving average (LSTM-ARMA) aided spectrum-prediction scheme, LSTM-ARMA model is constructed trained relying on specially...

Abstract In this paper, we consider a cooperative relay network consisting of source, destination and multiple decode‐and‐forward relays in the presence eavesdroppers, which intend to tap confidential messages transmitted by both source relays. We propose so‐called secrecy maximisation oriented selection (SMORS) multi‐relay (MRORS) schemes improve physical layer security wireless communications. SMORS scheme, single with maximal rate is selected among all forward signal. By contrast, MRORS...

In this paper, we investigate the physical-layer security of a spectrum-sharing aided satellite-terrestrial integrated network comprised pair satellite system and terrestrial system, which can utilize shared spectrum in presence an eavesdropper. We propose specifically designed scheduling scheme to guarantee wireless transmission against eavesdropping attacks face co-channel interference generated by communication where is represented multi-satellite (MSS). analyze security-reliability...

In this article, we investigate a pair of spectrum-sharing low-Earth-orbit (LEO) satellites, where one satellite uses the traditional fixed multibeam (FMB) antenna, and other is equipped with digital beamforming (DBF) antenna. These satellites may generate cofrequency interference (CFI) imposed on each other, resulting in significant transmission-capacity decrement. To mitigate CFI, propose power control-aided mitigation (BFPC-IM) scheme for both uplink downlink scenarios. scenario, vectors...

Satellite based spectrum sensing is studied for a system consisting of multiple satellites and gateway (GW), where these perform send mass spectrum-sensing data to the GW. To address challenges limited transmission capacity links from GW, we propose method called joint anomalous repairing deep convolutional neural network reconstruction (ADRD-SR), which can reconstruct original incomplete data. Specifically, GW preprocesses using algorithm. A constructed well trained, then it activated...