The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper discusses the active and reactive power control method for a modular multilevel converter (MMC) based grid-connected PV system. The voltage vector space analysis is performed by using average value models for the feasibility analysis of reactive power compensation (RPC). The proposed double-loop control strategy enables the PV system to handle unidirectional active power flow and bidirectional...
In this paper, we consider wireless caching in device-to-device (D2D) cooperative networks and propose a new definition,energy-consumption-ratio (ECR), to measure the energy efficiency that caching schemes can achieve. Based on this definition,we formulate an optimal energy-efficient caching problem and develop a caching scheme, named SBRC-2S. Simulation results show that the proposed scheme outperforms...
In an underlay cognitive radio network, the cross- channel gain from a cognitive transmitter (CT) to a primary receiver (PR) is crucial for spectrum sharing. By exploiting the relaying capability of the CT, we propose a proactive estimation scheme for the cross-channel gain. In particular, the CT proactively acts as a full-duplex amplify-and- forward (AF) relay for primary transceivers to trigger...
In cognitive radio networks, the channel gain between primary transceivers, namely, primary channel gain, is crucial for a cognitive transmitter (CT) to control the transmit power and realize spectrum sharing. To obtain the primary channel gain, a backhaul between the primary system and the CT is needed. However, the backhaul is usually unavailable in practice. To deal with this issue, the CT is enabled...
In cognitive radio networks, the location information of the primary receiver is critical for underlay spectrum sharing. However, positioning the primary receiver in frequency division duplex (FDD) systems is very challenging. In this paper, we propose a novel method to position the primary receiver using the full-duplex amplified-and-forward (AF) relay technique. Simulation results indicate that...
This paper investigates the strategy optimization control for a kind of networked evolutionary games with bankruptcy mechanism by using semi-tensor product of matrices, and presents some new results. First, the evolutionary dynamic of the given networked evolutionary game is constructed as a logical dynamic system, and then converted into its algebraic form via the semi-tensor product. Second, a free-type...
This paper investigates the algebraic formulation for a class of dynamic games with random entrance by using the semi-tensor product method, and presents a number of new results. The given dynamic game is considered as a kind of networked evolutionary games defined on finite networks, based on which, it is formulated as an Markov processes to analyze. Then, an illustrative example is studied to support...
In frequency duplex division systems, it is very challenging to position the receiver (Rx) that belongs to the third-party system since the anchors usually do not know which frequency band the Rx uses for transmission. As a result, they can only use the received signal from the third-party transmitter (Tx) to position the Rx. In this paper, we propose a relay-based positioning method to estimate the...
In frequency division duplex (FDD) two-tier networks, the probing technique has recently been introduced into the cross-channel gain estimation, which requires the tier-two user to act as a relay for the tier-one user. Then the tier-two user can autonomously estimate the cross-channel gain. However, the improper location of the tier-two user, i.e., the relay, may cause severe interference to the tier-one...
In two-phase cooperative multicast communications, the unbalanced outage probabilities of the cell-center and cell-edge users are the main reason that caps the energy-efficiency of the system. In this paper, we consider the unbalanced outage probability and propose a probability-based relay selection and power control method to improve the energy-efficiency, in which each user can autonomously decide...
In this paper, we present a clustering scheme using fuzzy logic in multi-hop radar sensor networks (RSN) for target detection. We design fuzzy-logic-based cluster-head (CH) election considering routing selection algorithm under the condition of constant false alarm rate (CFAR) in fading environment. Three antecedents, the small scale fading of the signal transmitted by a radar sensor (RS) to the base...
Even though the wireless positioning in sensor networks has been extensively studied in the past decades, there is no contribution discussing positioning the receiver that belongs to another system, i.e., the third-party receiver. In this paper, we propose a new scheme to solve the problem by full-duplex rtechnique. In our scheme, we let the sensors conduct the full-duplex relay for the target receiver...
In this paper, we propose a new estimation method to obtain the cross-channel gain, which avoids the severe interference to the primary receiver (PR) in existing relay-assisted estimation methods. In our method, we let the cognitive transmitter add a time delay when it conducts the full-duplex amplify-and-forward relaying. This forces the time-difference-of-arrival (TDOA) between the direct and relay...
Estimating the cross-channel gain from a small cell base station to an active macro user is critical in two-tier heterogeneous networks (HetNets). Conventional methods require the backhaul link, which is too complicated to be used in HetNets. In this paper, we propose a new method to simplify the system. We find that by measuring the signal-to-noise ratio (SNR) and recognizing the modulation level...
This paper proposes a method to improve the phase noise of a X-band sweep source. It is based on a PLL(Phase-locked loop) circuit driven by a DDS(Direct Digital Synthesizer), and an offset source is introduced in the PLL circuit. The DDS is used to generate low-frequency sweep signal, the PLL circuit is used to multiply the low-frequency sweep signal, and the offset is introduced to decrease the phase...
In this paper, we propose a novel method which can automatically find the preferable hidden neuron numbers in deep neural networks. This method is completed by two cooperating algorithms: Principle Components Analysis (PCA) and Reinforcement Learning (RL). PCA is used to find a range of hidden neuron numbers, and RL is applied to search a better number of hidden neurons and update the searching points...
We consider a device-to-device (D2D) caching network, in which the wireless users act as caching helpers and can provide the proximal users popular files via the D2D links. Since the caching allocation strategy is the essential part, we investigate the caching schemes to improve the hitting probability. Specifically, we first propose a cut-off random caching scheme and further extent it to an optimal...
This paper investigates the algebraic formulation and stability for a class of networked evolutionary games with switched topologies by using the semi-tensor product method, and presents a number of new results. Firstly, a kind of algebraic expressions are formulated for the given networked evolutionary games to model its mixed strategy dynamic. Secondly, under some certain assumptions, the existence...
Investigation in MIMO-RSN (Multi-input Multi-output radar sensor networks) is becoming more attractive in current literature. In a MIMO system, power allocation in accordance with the channel gain can significantly improve the system throughput performance. This paper investigates three power allocation methods in MIMO-RSN: water-filling, equal power and channel inversion. Their performances are analyzed...
Clustering performances by low energy adaptive clustering hierarchy (LEACH) and hybrid energy-efficient distributed clustering approach (HEED) are compared in radar sensor networks for the first time to the best of our knowledge. In the target detection performances, we also compare the constant threshold approach (CTH) with the constant false alarm rate (CFAR) approach for both LEACH and HEED. The...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.