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In this paper, the results of quality and intelligibility assessment of speech masked by stationary and nonstationary noise have been proposed. Subjective speech quality assessment technique has been used to show that white noise masking ability is lower than one for pink and even for brown noise when SNR is less than 0 dB. Two algorithms of nonstationary noise forming have been proposed. They are...
High Resolution Range Profiles (HRRPs) are widely used in the field of Radar Non-Cooperative Target Recognition (NCTR). An exhaustive set of classification algorithms can be found in the scientific literature but it is not common to find the description of the architectures capable of generating range profiles. This work proposes a specific scheme of a 1-D high resolution imaging radar for maritime...
Next generation (5G) mobile communication systems has a goal of ultra-high peak data rate. Ultra-Dense Network (UDN) is viewed as one of the key technologies to meet this challenge. The trend of network densification brings more complex interference. To solve this problem, a novel user-centric virtual cell design is proposed. Considering the changes of virtual cell load, we propose a load-aware virtual...
Measuring the performance of hearing aids in the real-world is challenging because it depends on both the subject's auditory abilities and the auditory context in which they use their hearing aids. The auditory context includes characteristics of the listening activity, social context, and acoustic environment. Ecological momentary assessment is the state-of-the-art method for evaluating the performance...
Recently, rateless codes make a remarkable progress on achieving maximum network performance without incurring CSI feedback overhead, under dynamic contexts with time-varying channels. However, existing rateless codes are only optimal for single-carrier channels, but are far from optimal for multi-subcarrier OFDM channels that are dominantly adopted in modern high-speed wireless networks. In this...
In this paper, we study the power allocation and power splitting problem for simultaneous wireless information and power transfer (SWIPT) in a multi-user MISO broadcast system, in which there are two types of single-antenna users: traditional users that only receive information and modern users that receive information and energy simultaneously from a multi-antenna base station via power splitting...
This study employed red and blue light-emitting diodes (LEDs) and cold cathode fluorescent lamps (CCFLs) to stimulate orchid seedlings and examine the influence of various light sources in mother stock flasks. Using the Taguchi method, we identified the optimal parameter combination to be photoperiod 12 hours, ON-period 30 %, CCFL 0 Lux, red LED 500 Lux, and blue LED 150 Lux. The results show that...
millimeter wave (mmW) communication systems have the potential to increase data rates with low-latency, highly directional communication links. Due to the geometric nature of the propagation, mmW signals can also be used for accurate positioning. This paper explores the trade-off between communication rate and positioning quality in mmW systems. We show how rate and positioning quality interact as...
In this paper we investigate the localization performance limits of massive arrays working at mm-wave frequencies and adopting two different beamforming strategies. In the first one, array weights are set in order to point towards a precise direction (classic beamforming), whereas in the second one, such weights are randomly chosen (random beamforming). Thanks to the large set of measurements as well...
This paper analyzes the downlink performance of ultra-dense networks with elevated base stations (BSs). We consider a general dual-slope pathloss model with distance-dependent probability of line-of-sight (LOS) transmission between BSs and receivers. Specifically, we consider the scenario where each link may be obstructed by randomly placed buildings. Using tools from stochastic geometry, we show...
Supporting Public Protection and Disaster Relief (PPDR) services are mandatory in modern wireless access networks. The sub-1GHz band is particularly suited to provide PPDR services due to the better propagation characteristics and attendant increase in link budget. In this work, we describe a novel transmit mode under a multi-operator non-orthogonal spectrum sharing framework, which can provide robust...
To increase the communication range of multi-hop cognitive radio networks (CRNs) while avoiding the implied loss in throughput, use of incremental relaying has been suggested. In this paper, we discuss an incremental relaying (IR) protocol for cooperative multi-hop CRNs (CMHCRNs). A CMHCRN with multiple decode-and-forward relays in each hop is considered. In each hop, the relays whose received signal-to-noise-ratio...
In this article, we investigate how the performance of Massive MIMO cellular systems can be enhanced by introducing D2D communication. We consider a scenario where the base station (BS) is equipped with large, but finite number of antennas and the total number of UEs is kept fixed. The key design question is that what fraction of users should be offloaded to D2D mode in order to maximize the aggregate...
The spectrum sensing is a vital stage in cognitive radio networks. The performance of energy-based spectrum sensing scheme degrades under noise uncertainty, which can be improved by covariance-based sensing methods. In this paper, a double threshold-based spectrum sensing scheme using sample covariance matrix of received signal is presented, that improves the performance of conventional covariance-based...
The performance of a low-complexity detection technique for OFDM-IM over the Nakagami-m fading channel has been analyzed. The orthogonal frequency-division multiplexing with index modulation (OFDM-IM) has recently been used in conjunction with the subcarriers using on-off keying modulation. The result shows improved performance in comparison with the conventional OFDM. The closed-form expression for...
Efficient spectrum sensing is a crucial function in cognitive radio (CR) networks and that enables secondary users (SUs) to detect primary user (PU) activities and make a decision to utilize vacant channels in the spectrum. Cooperative spectrum sensing, which is a prominent sensing approach in the literature due to its ability to increase sensing accuracy, is based on sharing information about channel...
This paper proposes detection of anomaly acoustic scenes based on a temporal dissimilarity model. The periodicity in the temporal variation of acoustic scenes is first pointed out and then used to build a new stochastic model. In the new model, the temporal variation is expressed by dissimilarity between current and previous acoustic scenes. Anomaly acoustic scenes are detected based on the 24-hour...
Electroencephalogram (EEG) is a widely used signal for analyzing the activities of brain. It has extensively used for the diagnosis of different nervous system disorders such as Alzheimer's, Parkinson's, Seizures, Epilepsy, etc. Ocular activity creates significant artifacts in electroencephalogram recordings. These artifacts increase complexity in analyzing the EEG and obtaining the clinical information...
In underlay heterogeneous networks (HetNets), the distance between a macro base station (MBS) and a macro user (MU) is crucial for a small-cell base station (SBS) to control the interference to the MU and achieve the coexistence. To obtain the distance between the MBS and the MU, the SBS needs a backhaul link from the macro system, such that the macro system is able to transmit the information of...
We propose a user selection algorithm for the downlink multi-user millimeter wave systems. Our design aims to classify favorable users in terms of the achievable rate based on the channel state information. The phased-zero-forcing scheme is introduced to find the analog precoder gain easily under the multi-user environment. In order to maximize the overall sum-rate of selected users, we then establish...
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