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We have seen an ever-expanding set of location-aware services and devices become broadly available over the past years. Despite these promising applications and thorough research, indoor localization remains a very challenging topic and (near) perfect accuracy continues to be an open research challenge. In this paper, we acknowledge the growth and potential of smart home environments and focus on...
In this paper, we propose a scheme in which a communication relay unmanned aerial vehicle (UAV) estimates the distribution of the terminals and selects the optimal relay position for autonomous maneuvering. In order to accomplish mission success, warfighters on the battlefield must communicate with their commander all the time. Autonomous maneuvering of a relay UAV using the proposed scheme will support...
Location based services like localization in wireless network are drawing more and more attention in the recent years. According to published literatures, the fingerprint based method outperforms many other methods, where constructing an accurate fingerprint database is a new challenge. In this paper, we introduce a Bayesian regression model, Gaussian Process Regression(GPR) model to profile the signal...
This paper presents an approach to predict Quality of Experience (QoE) in WLAN networks based on information extracted from non-intrusive measurements which only require control and management frame capture. This procedure avoids costly equipment and it is forward compatible. Specifically, three measurements have been taken: the relative time duration of clear-to-send messages, the percentage of blocked...
Generalized frequency division multiplexing (GFDM) with the flexible structure is one of the promising candidates for the fifth generation wireless communication system. This paper focuses on training sequence design that is used in the estimation of in-phase(I) and quadrature(Q) imbalance parameters on GFDM receivers as well as frequency selective channel. Combining with the structure of low complexity...
Distributed, networked communication systems, such as relay beamforming networks are typically designed without considering how the positions of the respective nodes might affect the quality of the communication. That is, network nodes are either assumed to be stationary in space, or, if some of them are moving while communicating, their trajectories are assumed to be independent of the respective...
The features of compact-range communication system is introduced briefly. The system in presence of a shadowing object is simply modelled. Modified Edge Representation is applied to evaluate field strength of the system. In the end, bit error rate (BER) is roughly estimated under the multipath-free condition.
Mobile Broadband (MBB) access networks are becoming more and more used worldwide, and the devices adopted to access them are increasing in number and complexity (smart-phones, mobile hotspots, vehicular infotainment systems). The highly dynamic nature of such scenarios calls for continuous monitoring and measurement of the network. To this aim, the Available Bandwidth is a performance metric of the...
Transmission Power Control (TPC) protocols are poised for wide spread adoption in wireless sensor networks (wSNs) to address energy constraints. The link quality properties that need to be captured in order to identify the optimum transmission power (TP) have not been clearly defined and previous works have presented conflicting views on the matter. This has led to several current TPC protocols using...
In this work, a vector flow imaging (VFI) method based on synthetic aperture sequential beamforming and directional transverse oscillation (TO) is implemented in a commercial tablet. In comparison with previous tablet-based flow imaging implementations, the velocity estimation is extended to a 2-D angle-independent setup. The received data are pre-beamformed in the probe, which leads to a 64x data...
Link quality protocols employ link quality estimators to collect statistics on the wireless link either independently or cooperatively among the sensor nodes. Furthermore, link quality routing protocols for wireless sensor networks may modify an estimator to meet their needs. Link quality estimators are vulnerable against malicious attacks that can exploit them. A malicious node may share false information...
Utilization of millimeter-wave bands by next generation mobile networks is expected to make extremely high data rates realizable. However, at such high frequencies, phase noise (PHN) can significantly affect the performance of the communication system. Filter Bank Multi-Carrier systems with Offset Quadrature Amplitude Modulation (FBMC-OQAM) have received increased attention in recent years, but the...
Recent advances in information communication technologies will yield new systems/devices for the visually impaired. To realize such systems/devices, location information is essential, especially for indoor application. This paper proposes an indoor location estimation method that uses cost-effective radio frequency nodes. The proposed method uses received signal strength values to estimate the distance...
Wireless localization can provide position information for limitary, aerospace, emergency scheduling, rescue and relief work, fault diagnosis and many other related location-based services system in various application fields. Location information always supports critical decision-making of these application systems. So the localization accuracy is of great importance. As availability, low computation...
This work proposes a novel authentication method for identifying Unmanned Aerial Vehicles (UAVs) based on a channel-tap power. A ground control station utilized the channel-tap power as a radio-frequency fingerprint (RFF) to directly detect UAVs via physical (PHY) layer. The proposed authentication method uses the Neyman-Pearson test to discriminate between two UAVs, UAVI and UAVA, which are controlled...
This paper investigates direct beamformer estimation in dynamic time division duplexing (TDD) system with the objective of weighted sum rate maximization. For a given TDD frame, base stations (BS) are allocated to either uplink or downlink based on the instantaneous traffic state. The weighted sum mean-squared error minimization framework is used to obtain the decentralized iterative solution for...
The optimal sensor selection for scalar state parameter estimation in wireless sensor networks is studied in the paper. A subset of N candidate sensing locations is selected to measure a state parameter and send the observation to a fusion center via wireless AWGN channel. In addition to selecting the optimal sensing location, the sensor type to be placed in these locations is selected from a pool...
A random-vector-based beamforming scheme for Millimeter-Wave (mm-Wave) MIMO systems with asymptotic optimal performance at low signal-to-noise ratio (SNR) is proposed in this paper. Through transmitting random vectors from transmitter (TX) to receiver (RX) then back to TX, the proposed scheme can obtain the estimation of channel auto-correlation with low complexity operations and then obtain the nearly...
In order to describe the highly scattered property of millimeter wave (mmWave) multiple-input multiple-output (MIMO) channels, the existing high resolution frequency domain space-alternating generalized expectation-maximization (FD-SAGE) algorithm is studied and extended to three-dimentional (3D) MIMO case by including the estimation of elevation angles. The signal model and estimation procedure are...
The problem of two-dimensional (2D) direction of arrival (DOA) estimation with non-uniform L-shaped array is discussed. The generalized ESPRIT algorithm (GESPRIT) has an advantage of being suitable to arbitrary array geometry. However, the direct applying of (GESPRIT) algorithm in non-uniform L-shaped array (called 2D-GESPRIT) needs an exhaustive 2D spectral search, which makes it unfeasible in practice...
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