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In our paper, a novel method is proposed to obtain the optimal positions of secondary base stations (SBSs) for cognitive radio Internet of Things (IoT) sensor networks and to select the optimal operating channel in order to maximize the secondary capacity, while also protecting the primary systems. We proposed an appearance probability matrix for secondary IoT sensor devices in order to maximize the...
Mass spectrometry is an optoelectronic method of determining organic substances by comparing their mass spectrum with mass spectra found in system libraries. In the case of biological products, substances of interest, biotic or xenobiotics, may be “hidden” from the background of the analyzed matrix noise, which alters the major aspect of the mass spectrum obtained and faces the impossibility of their...
Recently, it was shown that the dithered relative prime interleavers and quadratic permutation polynomial (QPP) interleavers can be expressed in terms of almost regular permutation (ARP) interleavers. In this paper, the conditions for a QPP interleaver to be equivalent to an ARP interleaver are extended for cubic permutation polynomial (CPP) interleavers. It is shown that the CPP interleavers are...
This paper investigates the outage performance of full duplex cognitive radio networks. We consider that a dual-hop system with multiple decode-and-forward (DF) relays. We assume that there is no direct link between secondary source terminal (S) and destination (D), and self-interference exists at the relays. All the links are independent identically distributed (IID) Rayleigh distributed. In order...
In this paper, we study the secrecy performance of cooperative single carrier system with the kth-best user selection scheme in Rayleigh fading channels. Assuming perfect decoding at the relay, we choose the legitimate user with the kth-best instantaneous signal-to-noise ratio (SNR) among Q users to receive the forwarded messages, which are intercepted at a passive eavesdropper simultaneously. To...
In this paper, we analyze the downlink outage performance of opportunistic scheduling in dual-hop fixed-gain amplify-and-forward (FG-AF) cooperative networks consisting of one source, multiple radio-frequency (RF) energy harvesting relays, and multiple destinations. To this end, a relay-destination selection scheme named direct links plus opportunistic channel state information (CSI)-based selection...
In orthogonal frequency-division multiplexing (OFDM) systems, the broadband channel features sparse structure in delay domain. By fully exploiting the sparse structure of channels, transform domain (TD) channel estimation (CE) methods such as discrete Fourier transform (DFT) method and compressed sensing (CS)-based methods can greatly upgrade the performance of channel estimation. When the paths of...
Methods based on pattern recognition such as support vector machine or neural network, can overcome the deficiency of traditional sound source localization algorithms which have an insufficient robust ability in the harsh environment of small SNR and severe reverberation. Among those methods, Naive-Bayes classifier has a high accuracy to locate sound source with a small amount of calculation and strong...
Spectrum sensing is a fundamental technique of cognitive radio (CR) system to detect the presence of primary user (PU) transmissions in the licensed spectrum. This paper investigates secondary user (SU) selection based cooperative spectrum sensing under exponentially embedded family (EEF) criterion. With an aim to estimate the optimal number of cooperative users who are better fitting for participating...
In this paper, the energy efficiency (EE) of a cooperative diversity system with maximum diversity network coding (MDNC) is studied. In the considered system, channel state information (CSI) is only available at the receivers for all the channels. We formulate the problem of maximizing the EE under the constraint on the outage probability. The problem is NP-hard due to the non-convexity of the outage...
In this paper, we propose a novel relay selection policy based on the Hybrid Relay Selection (HRS) relay selection protocol that takes into account the state of the buffers and aims at reducing the average packet delays in the network. The proposed protocol, called the Delay-Aware HRS (DA — HRS) protocol is analyzed by means of Markov Chains and expressions for the outage probability, throughput and...
In hard decision cooperative spectrum sensing (CSS), each secondary user (SU) or simply cognitive radio user (CR) senses the primary user (PU) activity via a Sensing channel (S-channel) and forwards its own binary decision to a fusion center (FC) via a Reporting channel (R-channel) to make a final decision regarding PU existence. In practical scenarios, both S-channels and R-channels are contaminated...
In this work we propose a new recursive block decoding method for MIMO systems. A complexity reduction is obtained compared to existing methods by avoiding the exhaustive decoding on one block. We propose the use of a semi-exhaustive search using a list composed of the Maximum Likelihood (ML) solution and its neighborhoods. We show through error probability derivation that we can achieve the full...
Wavelet-OFDM based on the discrete wavelet transform, has received a considerable attention in the scientific community, because of certain promising characteristics. In this paper, we compare the performance of Wavelet-OFDM based on Meyer wavelet, and OFDM in terms of peak-to-average power ratio (PAPR), bit error rate (BER) for different channels and different equalizers, complexity of implementation,...
In this paper we study the association performance of a small cell base station (SBS) when mobile users (MUs) are randomly located around the said SBS according to a homogeneous Poisson point process. In the analysis, we consider noise only, interference-plus-noise, and interference-limited systems. For each case of association metric, a closed form expression for the outage probability of a randomly...
Free space optical (FSO) communication has become more exciting during the last decade. It has unregulated spectrum with a huge capacity compared to its radio frequency (RF) counterpart. Although FSO has many applications that cover indoor and outdoor environments, its widespread is humped by weather effects. Fog is classified as an extreme weather impairment that may cause link drop. Foggy channel...
This paper tackles the capacity optimization problem for Device-to-Device (D2D) coexisting with long term evolution (LTE) cellular system. We firstly derive and analyse the probability density functions of the Signal-to-Interference Ratio (SIR). We show that the capacities of both D2D and LTE are concave and convex respectively w.r.t the transmitted power ratio. To maximize the capacity sum of both...
Principles of signal-code sequence (SCS) are examined. New methods and technical solutions are proposed to select the type of signal structures in order to achieve the best throughput and performance in wireless communication channel. The information efficiency criterion for channel resources usage is proposed based on the analysis of indicators and criteria that are recommended in the standard 802...
We investigate Elastic Optical Networks under fiber failures. In the low Link Margin regime, up to 43% of affected demands are accommodated in existing higher QAM lightpaths.
Calculating the beamformers and combiners in multiple-input multiple-output (MIMO) wireless telecommunication systems is an important research issue. This calculation is significant because helps to analyze the overall system performance. Several authors proposed different algorithms for this process. However, these algorithms require a great number of iterations for converging. Considering reduction...
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