In response to the problems of high complexity and large amount operations existing color image encryption algorithms, a low-complexity, low-operation algorithm based on combination bit-plane chaotic systems is proposed that interrelated with plaintext information. Firstly, three channels an RGB are extracted, gray value each pixel channel can be expressed by eight-bit binary number. The higher- lower-four bits exchanged, position four-bit number scrambled logistic sequence, all numbers...

In this paper, the performance of non-orthogonal multiple access (NOMA) based cooperative spectrum sharing in hybrid satellite-terrestrial networks (HSTNs) is investigated, where primary satellite network recruits secondary terrestrial as a relay. To improve fairness and utilization under (i.e. overlay paradigm cognitive radio), NOMA power allocation profile determined by instantaneous channel conditioning at second temporal phase. The closed-form outage probability approximated ergodic...

In this paper, we study the multiple-user non-orthogonal multiple access (NOMA) scheme in hybrid satellite-terrestrial relay networks (HSTRN). The proposed system model takes into account both decode-and-forward (DF) and amplify-and-forward (AF) protocols at imperfection of channel state information (CSI) all nodes. We analyze outage performance investigate power allocation problem to ensure fairness among users. Specially, derive closed-form expressions asymptotic high...

Digital images can be large in size and contain sensitive information that needs protection. Compression using compressed sensing performs well, but the measurement matrix directly affects signal compression reconstruction performance. The good cryptographic characteristics of chaotic systems mean one to construct has obvious advantages. However, existing low-dimensional have low complexity generate sequences with poor randomness. Hence, a new six-dimensional non-degenerate discrete...

The capability of flexible network management makes it available to incorporate software-defined networking (SDN) in the wide area (WAN). Thereinto, multiple controllers are deployed (SDWAN) tackle performance bottleneck. Thus, how effectively solve load balancing problem control plane towards SDWAN under different constraints is worthy further study. In order achieve among distributed controllers, we proposed a low-complexity controller placement algorithm, Simulated Annealing...

In the field of secure communications, robustness cipher images transmitted in various channels is becoming increasingly important. this paper, a robust image encryption algorithm combining new chaotic system and discrete cosine transform proposed, which interlinked with plain information resistant to high-intensity noise attacks. First, 5D continuous hyperchaotic leading an interrelated sequence five sequences. Second, subjected transform. Then domain quantized, some high-frequency...

In this paper, we consider the resource allocation problem in uplink cognitive satellite-terrestrial networks, where satellite users reuse frequency band of terrestrial cellular networks. scenario, joint radio strategy has to be reasonably designed satisfy interference constraint required by incumbent network (ITN). We formulate optimization model with perspective efficiency and fairness, is defined as maximum tolerable outage probability ITN. Then, simplify proposed into a tractable convex...

To address the problems of high complexity and low security existing image encryption algorithms, this paper proposes a dynamic key chaotic algorithm with associated plaintext. Firstly, RGB components color are read, normalized to obtain that is closely related plaintext, then Arnold transform used stretch fold change position pixel points in space, so as destroy correlation between adjacent image. Next, generated sequences independently encrypted Arnold-transformed matrix. Finally, three...

Wireless content delivery (CD) and non-orthogonal multiple access (NOMA) have been confirmed to be promising effective approaches gain substantial performance improvement for hybrid satellite-terrestrial (HST) networks. To improve the spectrum efficiency reduce delay of retrieving satellite user, we investigate HST-CD network with NOMA scheme, where proactively pushes/broadcasts popular contents cache-enabled relay, then user is able directly retrieve required from relay less transmission...

In this letter, we investigate the distributed power control problem in downlink cognitive satellite-terrestrial networks (CSTNs) while considering quality of service (QoS) requirements primary satellite links. Specifically, a game-theoretic approach is employed to analyze but mutually affected decision-making problem. With perspective resource efficiency enhancement and interference mitigation, novel utility function based on trade-off between transmission rate mutual properly designed for...

As the increasing of both users' demand and number communication satellites, spectrum resource is becoming increasingly scarce. Cognitive radio (CR) can effectively alleviate scarcity resource. By using CR technology in satellite terrestrial integrated network, share with equipment to improve utilization. However, due communication's inherent openness intelligent level devices, it makes vulnerable misuse, which seriously threatens reliability efficiency system. This paper studies detection...

Due to the increasing spectrum scarcity in satellite communications and terrestrial communications, cognitive have received widespread attention. In this paper, we take inherent feature that users suffer from inter-beam interference. particular, for first time, consider coupling characteristics of channel access power optimization opportunistic based on distributed frameworks. We formulate a joint game, which is proven be an exact potential game accordingly has at least one pure Nash...

The accelerating process of economic globalization and upgrading port city have formed an interactive development system. is a pre-requisite for the rapid economy. However port-related activities will consume lot resources negative impact on environment. This paper establishes system dynamics model interaction between based green concept in order to describe relations systematically taking into account promotion, resource consumption environmental pollution. applied Shanghai analyze relation...

This letter investigates the bandwidth allocation problem for discontinuous frequency bands in cognitive satellite-terrestrial networks (CSTNs). Different from existing studies, we take realistic assumption that available idle spectrum are disconnected. Most of works focused on continuous and proposed corresponding algorithms optimizing variables, which cannot directly solve bands. Besides, also individual requirement, priority terrestrial users, limitation total into consideration. The is...

In multi-user container terminals, the berth schedule, in which, berthing position, time and number of quay cranes are arranged for each ship, is made advance based on sailing schedule coming ships. However, practice, often disrupted many reasons, such as bad weather, or decisions from ship companies, etc. This kind disruption will cause original corresponding ports to be no longer optimal, simply unfeasible. Thus, scheduling problem with was addressed this paper. Initially, disruptions were...

Frequency-hopping communication has the capability to resist narrowband interference, which is in direct proportion hopping rate.In frequency-hopping system, interference signals exist partial de-hopping signals, equivalent time-varying existed signals.Through integrating diversity combining techniques of fast with singular value decomposition method, this paper detects points, masks them, and then combines undisturbed frequencyhopping signals.MATLAB simulation shows that well restrained...

For massive multiple-input multiple-output (MIMO) distributed wireless sensor networks, this paper investigates the role of multi-antenna sensors in improving network perception performance. First, we construct a based on MIMO. By using anti-fading characteristics multi-antennas, it is better to achieve accurate detection than single-antenna network. Based this, derive closed-loop expression for probability best detector. Then, consider case that power resources are limited, and thus want...

With the extensive research of multiantenna technology, beamforming (BF) will play an important role in future communication systems due to its high transmission gain and satisfying directivity. If we can detect non-cooperative beams, it is great significance counter reconnaissance, beam tracking, spectrum sensing transmitters. This paper investigates wireless sensor networks (WSNs), which used unknown signal. In order perceive presence signals without prior information, first derive...

In this paper, we study the three-dimensional deployment of UAV in Internet Things communication, and propose a game theory based self-organization scheme. According to dynamic characteristics UAVs, model is designed as an extended game, optimal performance system obtained by solving sub-game refined Nash equilibrium solution at each stage. Aiming objective function maximize global coverage, utility potential satisfying are designed. stage, algorithm on automatic learning machine proposed...