Temat: cognitive radio - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Mathematical Foundations of Cognitive Radios
Autorzy:: Couillet, R.
Debbah, M.
Tematy:: Bayesian inference
cognitive radio
maximum entropy; Pokaż więcej
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/308175.pdf Link otwiera się w nowym oknie
Opis:: Recently, much interest has been directed towards software defined radios and embedded intelligence in telecommunication devices. However, no fundamental basis for cognitive radios has ever been proposed. In this paper, we introduce a fundamental vision of cognitive radios from a physical layer viewpoint. Specifically, our motivation in this work is to embed human-like intelligence in mobile wireless devices, following the three century-old work on Bayesian probability theory, the maximum entropy principle and minimal probability update. This allows us to partially answer such questions as, what are the signal detection capabilities of a wireless device, when facing a situation in which most parameters are missing, how to react and so on. As an introductory example, we will present previous works from the same authors following the cognitive framework, and especially the multi-antenna channel modeling and signal sensing.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Implementation of Selected Spectrum Sensing Systems for Cognitive Radio Networks using FPGA Platform
Autorzy:: Abdullah, H. N.
Abed, H. S.
Tematy:: cognitive radio
energy consumption
energy detection
FPGA; Pokaż więcej
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/958080.pdf Link otwiera się w nowym oknie
Opis:: The energy efficient spectrum sensing method is very important in cognitive radio (CR), since high power drain may limit its implementation in mobile applications. The spectrum sensing feature consumes more energy than other functional blocks, as it depends on continuous detection of the presence or absence of the primary user (PU). In this paper, we proposed two methods to reduce energy consumption of the spectrum sensing feature. The ﬁrst is of a single stage variety with a reduced number of sensed samples. The other uses two stages. The ﬁrst stage performs coarse sensing for many subchannels, and the best subchannel is forwarded for ﬁne sensing in the second stage. The performance of the proposed methods is evaluated in AWGN channel and compared with the existing approach. The proposed methods are simulated using Matlab and ModelSim and are then hardware implemented using the Altera Cyclone II FPGA board. Simulation results show that the proposed methods oﬀer an improvement in energy consumption with an acceptable reduction in the probability of detection. At Eb/N0 Eb/N0 Eb/N0 of 0 dB, the energy consumption is reduced by 50% and 72% in the ﬁrst and second proposed method, respectively, compared to the traditional method (100% sensing).
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Optimal Voting Rule and Minimization of Total Error Rate in Cooperative Spectrum Sensing for Cognitive Radio Networks
Autorzy:: Ghosh, Samit Kumar
Trankatwar, Sachin Ravikant
Bachan, P.
Tematy:: cognitive radio
energy detection
optimization
spectrum sensing; Pokaż więcej
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/1839471.pdf Link otwiera się w nowym oknie
Opis:: In cognitive radio technology, spectrum sensing is essential for detecting spectrum holes which may be allotted to secondary users. In this paper, an optimal voting rule is used for cooperative spectrum sensing while minimizing the total error rate (TER). The proposed spectrum sensing method is more energy-efficient and may be implemented in practice. It is relied upon in an improved energy detector whose utilization depends on the presence or absence of the primary user. Expressions for false alarm and missed detection probabilities are derived in the paper as well. Overall performance is analyzed both for AWGN and Rayleigh fading channels, in the presence of additive white Gaussian noise (AWGN). The optimum voting rule is applied to the cooperative spectrum sensing process in order to identify the optimum number of sensing nodes and the detection threshold. Finally, an energy-efficient spectrum sensing algorithm is proposed, requiring a lower number of cognitive users for a given error bound.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Optimal Voting Rule and Minimization of Total Error Rate in Cooperative Spectrum Sensing for Cognitive Radio Networks
Autorzy:: Ghosh, Samit Kumar
Trankatwar, Sachin Ravikant
Bachan, P.
Tematy:: cognitive radio
energy detection
optimization
spectrum sensing; Pokaż więcej
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/1839487.pdf Link otwiera się w nowym oknie
Opis:: In cognitive radio technology, spectrum sensing is essential for detecting spectrum holes which may be allotted to secondary users. In this paper, an optimal voting rule is used for cooperative spectrum sensing while minimizing the total error rate (TER). The proposed spectrum sensing method is more energy-efficient and may be implemented in practice. It is relied upon in an improved energy detector whose utilization depends on the presence or absence of the primary user. Expressions for false alarm and missed detection probabilities are derived in the paper as well. Overall performance is analyzed both for AWGN and Rayleigh fading channels, in the presence of additive white Gaussian noise (AWGN). The optimum voting rule is applied to the cooperative spectrum sensing process in order to identify the optimum number of sensing nodes and the detection threshold. Finally, an energy-efficient spectrum sensing algorithm is proposed, requiring a lower number of cognitive users for a given error bound.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: About Cognitive Radio Receiver under an Indoor Environment
Autorzy:: González, Ricardo Meneses
Tematy:: Cognitive radio
indoor environment
spectrum hole
white space; Pokaż więcej
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:: https://bibliotekanauki.pl/articles/1193910.pdf Link otwiera się w nowym oknie
Opis:: This small note makes an analysis of the current situation of the Cognitive Radio (CR) performance under an indoor environment. As well as, measurements of the electromagnetic environment in the 800-900 MHz UHF Band are carried out in a specific indoor environment, in order to discover a spectrum hole to be used by an cognitive radio unlicensed user.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Power Allocation for Energy-Harvesting-based Fading Cognitive Multiple Access Channels : with or without Successive Interference Cancellation
Autorzy:: Li, Q.
Xu, D.
Tematy:: cognitive radio
power allocation
multiple access channels
energy harvesting; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/963855.pdf Link otwiera się w nowym oknie
Opis:: This paper considers a fading cognitive multiple access channel (CMAC), where multiple secondary users (SUs), who share the spectrum with a primary user (PU), transmit to a cognitive base station (CBS). A power station is assumed to harvest energy from the nature and then provide power to the SUs. We investigate the power allocation problems for such a CMAC to maximize the SU sum rate under the interference power constraint, the sum transmit power constraint and the peak transmit power constraint of each individual SU. In particular, two scenarios are considered: with successive interference cancellation (SIC) and without SIC. For the first scenario, the optimal power allocation algorithm is derived. For the second scenario, a heuristic algorithm is proposed. We show that the proposed algorithm with SIC outperforms the algorithm without SIC in terms of the SU sum rate, while the algorithm without SIC outperforms the algorithm with SIC in terms of the number of admitted SUs for a high sum transmit power limit and a low peak transmit power limit of each individual SU.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Optimization of Spectrum Sensing Parameters in Cognitive Radio Using Adaptive Genetic Algorithm
Autorzy:: Chatterjee, S.
Dutta, S.
Bhattacharya, P. P.
Roy, J. S.
Tematy:: adaptive genetic algorithm
bandwidth
cognitive radio
spectrum sensing
throughput; Pokaż więcej
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/308511.pdf Link otwiera się w nowym oknie
Opis:: Quality of service parameters of cognitive radio, like, bandwidth, throughput and spectral efficiency are optimized using adaptive and demand based genetic algorithm. Simulation results show that the proposed method gives better real life solution to the cognitive radio network than other known approach.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Cooperative games with incomplete information for Secondary Base Stations in cognitive radio networks
Autorzy:: Martyna, J.
Tematy:: Bayesian equilibrium
cognitive radio networks
game theory
wireless communication; Pokaż więcej
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/308673.pdf Link otwiera się w nowym oknie
Opis:: Cognitive radio (CR) technology is considered to be an effective solution for enhancing overall spectrum efficiency. Using CR technology fully involves the providing of incentives to Primary Radio Networks (PRNs) and revenue to the service provider so that Secondary Base Stations (SBSs) may utilize PRN spectrum bands accordingly. In this paper, a cooperative games with incomplete information for SBSs in a CR network is presented. Each SBS can cooperate with neighboring SBSs in order to improve its view of the spectrum. Moreover, proposed game-theory models assume that the devices have incomplete information about their components, meaning that some players do not completely know the structure of the game. Using the proposed algorithm, each SBS can leave or join the coalition while maximizing its overall utility. The simulation results illustrate that the proposed algorithm allows us to reduce the average payoff per SBS up to 140% relative to a CR network without cooperation among SBSs.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: On Employing a Savitzky-Golay Filtering Stage to Improve Performance of Spectrum Sensing in CR Applications Concerning VDSA Approach
Autorzy:: Angrisani, L.
Capriglione, D.
Cerro, G.
Ferrigno, L.
Miele, G.
Tematy:: cognitive radio
smoothing filter
VDSA
spectrum sensing
spectral measurements; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/220369.pdf Link otwiera się w nowym oknie
Opis:: In this paper, a filtering stage based on employing a Savitzky-Golay (SG) filter is proposed to be used in the spectrum sensing phase of a Cognitive Radio (CR) communication paradigm for Vehicular Dynamic Spectrum Access (VDSA). It is used to smooth the acquired spectra, which constitute the input for a spectrum sensing algorithm. The sensing phase is necessary, since VDSA is based on an opportunistic approach to the spectral resource, and the opportunities are represented by the user-free spectrum zones, to be detected through the sensing phase. Each filter typology presents peculiarities in terms of its computational cost, de-noising ability and signal shape reconstruction. The SG filtering properties are compared with those of the linear Moving Average (MA) filter, widely used in the CR framework. Important improvements are proposed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Kognitywne radiowe sieci Ad-Hoc i ich projektowanie
Cognitive radio ad hoc networks and their design
Autorzy:: Atras, Przemysław
Opis:: Rosnące zapotrzebowanie na częstotliwości radiowe wymusza tworzenie inteligentnych form zarządzania rzadkimi zasobami widma. Technologa radia kognitywnego, stosowana w sieciach bezprzewodowych ma pomóc w zniesieniu obecnych ograniczeń, poprzez zwiększenie efektywności wykorzystania widma, poprzez oportunistyczną eksploatację dostępnych fal radiowych. Celem niniejsze pracy jest prezentacja podstawowych własności kognitywnych sieci radiowych oraz zwrócenie szczególnej uwagi na korzyści płynące z ich wdrażania. Kolejne rozdziały przybliżają podstawowe definicje, architekturę kognitywnych sieci radiowych oraz podstawowe funkcje zarządzania widmem. Opis technicznych aspektów tworzenia sieci kognitywnych, zwłaszcza w kontekście trasowania, poszerzony jest opisem aplikacji, wykorzystującej teorię gier do analizy algorytmów warstwy fizycznej kognitywnych sieci radiowych, skoncentrowanym na adaptacyjnym wyborze częstotliwości, zapewniającym połączeniom unikanie interferencji.
The increasing demands for radio frequencies enforces the creation of intelligent management forms that taking care of rare spectrum resources. Cognitive radio technology is supposed to be used in wireless networks to lift the current restrictions, by increasing the efficiency of spectrum use, by opportunistic exploitation of the available radio waves. The aim of this paper is to present the basic properties of cognitive radio networks and pay particular attention to the benefits of their implementation. Subsequent chapters present basic definitions, cognitive radio networks architecture and common functions of spectrum management. Description of the technical aspects of cognitive networking, especially in the context of routing, is extended by the description of the application that using game theory to analyze the physical layer algorithms for cognitive radio networks, focused on adaptive selection of frequencies, ensuring interference avoidance.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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