In this paper, we consider a cognitive relaying network, where the sensor transmitter (CST) is capable of harvesting energy from radio frequency signals with power splitting scheme. Specifically, primary (PT) broadcasts its signal to receiver (PR) and CST in first transmission slot. After receiving PT's signal, splits received into two parts, one for information decoding other harvesting. second slot, allocates part accessed bandwidth forward PR amplify-and-forward or decode-andforward...

With the rapid development of Internet-of-Things (IOT) applications, performance existing wireless localization methods under nonline-of-sight (NLOS) transmission environments is seriously challenged. Therefore, this article proposes a new definition residual, that is, angle residual. The key target residual to detect line-of-sight (LOS) links from measured and calculated parameters. position then estimated by two-step weighted least-squares (TS-WLS) algorithm, where only positioning...

The correlation coefficient of two consecutive Gaussian sequences is modulated by a binary message bit to achieve secure communication system. receiver the proposed random system demodulates received signal estimating transmitted sequences. Theoretical error rate (BER) expressions in frequency‐flat/‐selective fading channels with/without Doppler shift are derived. Simulation results show that can reasonably low BERs an additive white noise channel as well Rayleigh channel. More importantly,...

In this study, the parameter of a symmetric α ‐stable (S S) noise sequence is modulated by binary message to achieve secure communication system. The characteristic exponent ‘ ’ an S carries information. order recover at receiver, authors propose logarithmic moments estimator estimate transmitted sequence. optimal decision threshold and minimum theoretical bit error ratio are derived. It shown that simulation results presented consistent with analytical results. Moreover, shows better...

A novel iterative Doppler shift estimator is proposed in very low signal-noise-ratio (SNR) environments single carrier mobile systems. The method exploits the logarithm envelope (LE) of channel estimates, and iteratively finds minimum mean square error (MMSE) estimation shift. Extensive simulations conducted under a wide range noise corruption clearly show that substantially outperforms several existing estimators terms accuracy.

Wireless sensor networks (WSN) have recently emerged as a hot research topic. One of the most important concerns for WSN is energy. To obtain long lifetime, one potential method to use clustering algorithm. Moreover, should meet various requirements quality service (QoS). Accordingly, this paper presents an energy-aware QoS routing algorithm WSN, which can also run efficiently with best-effort traffic. Furthermore, our work differs from existing algorithms in two ways: (1) improve first...

Recently, thanks to the development of wireless communications, radio propagation plays an important role in research electromagnetic wave. Furthermore, signal-to-noise ratio (SNR) and Doppler shift propagations receive many attentions due their comprehensive use adaptive reception. Hence with help double sampling rate (DSR) technique, this paper presents a new estimator estimate above two parameters together. We verify our algorithm by computer simulation, results have shown good...

In this paper, an adaptive Doppler shift estimator based on the square envelope autocorrelation function of mobile propagation channel is proposed. Furthermore, proposed exploits iterative minimum finding procedure to reduce effect additive noise. Both theoretical analysis and experiments are provided show that method yields fairly good signal-to-noise ratio (SNR) insensitive performance in a wide range velocities SNRs

Mobile ad hoc network (MANET) is a that every node processes packet routing without infrastructure. The fast equipping and mobile self-organization characters push MANET the hot point in wireless communication research. Based on on-demand vector (AODV) protocol, this paper provides novel MAODV protocol research based mobility prediction algorithm. controls route discovery, keeping switch by estimating neighbor node's distance predicting to suit changed topology. Simulator result demonstrates...

In this paper, we proposed a cooperative spectrum sharing strategy based on contract theory with optimal power and bandwidth allocation. Specifically, primary user (PU) secondary users (SUs) act as the employer employees like labor consumption market, respectively. SUs provide labor, i.e. relay used for forwarding PU's signal, in exchange reward, accessing transmitting their own signals. PU needs to overcome challenge how balance relationship between contributions incentives SUs. We designed...

Currently, the security of information in physical layer has attracted much attentions. However, such a conventional study depends on assumption reciprocity between uplink and downlink channels. This cannot be ensured time-selective channel mobile communications. Hence, this paper proposes an encryption algorithm First, statistics are extracted to act as seeds for multiple chaos generator. Second, produced sequences combined produce secret code. Finally, signal is encrypted by simple...

This paper proposes a new degree distribution for systematic fountain codes by analyzing the property of code. The erasure probabilities are also taken into consideration during design. simulation shows that needs less encoding packets to recover all source packets, has rapid constringency speed, and its performance is not very sensitive probabilities.

To achieve secure communication between legitimate users, a physical layer encryption scheme based on random rotation of the modulated symbol is proposed. By exploiting behavior and reciprocity property wireless channel, channel state information (CSI) shared transmitter receivers used as initial seed to generate chaotic sequence. The uses sequence rotate enhance security reduce eavesdroppers' ability demodulated symbols correctly. Due fact that eavesdropper does not posses any about because...

Abstract We put forward a novel frequency offset estimator for burst orthogonal division multiplexing (OFDM) systems under double selective fading channels. With the help of pilot bits and channel estimates in domain, we calculate delay power spectrum (DPS) multi‐path channels estimate integer carrier (CFO), which FFT‐realized ( Fast Fourier Transform ) algorithm is computation effective. Additionally, pseudo noise (PN) sequence proposed to act as signal extend estimation range. Yet uses...

Frequency sampling is a classical method for 2-D FIR filters design, which can be subdivided into the uniform and non-uniform approaches. However, previous work mainly focused on reducing algorithm complexity or seeking alternative implementation approaches rather than optimizing samples. In this paper, to refine conventional frequency proposed, where samples equally distributed Cartesian grid are adjusted by utilizing DEPSO so as achieve nearly optimum minimax design. Simulation results...

In order to locate license plates in a complex environment, we develop novel plate location algorithm by combing the texture features of and RGB color space. A picture is first filtered with custom convolutional kernel enhance characters, followed morphological processing get region set A. The are then extracted from picture, B obtained performing processing. Region C intersection operation B. Finally, through elimination pseudo-regions, real located. Evaluation this on pictures sampled...