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Cellular heterogeneous networks (HetNets) with densely deployed small cells can effectively boost network capacity. The co-channel interference and the prominent energy consumption are two crucial issues in HetNets which need to be addressed. Taking the traffic variations into account, in this paper, the performances of HetNets with joint further-enhanced inter-cell interference coordination (FeICIC)...
Heart rate (HR) monitoring is necessary for daily healthcare. Wrist-type photoplethsmography (PPG) is a convenient and non-invasive technique for HR monitoring. However, motion artifacts (MA) caused by subjects' movements can extremely interfere the results of HR monitoring. In this paper, we propose a high accuracy method using motion decision, singular spectrum analysis (SSA) and spectral peak searching...
The Reduced Power Subframes (RPS) are encouraged to be applied in the LTE-Advanced Heterogeneous Networks (HetNets), to reduce the capacity loss caused by the Almost Blank Subframes (ABS). However, the RPS are supposed to be used in the macrocells only. In fact, the RPS can also be used in femtocells to mitigate the interference that the macrocell edge users suffers, but its performance is not investigated...
Channel-width adaptation can significantly improve the connectivity, capacity and reduce the power consumption in wireless networks. The OFDMA-based channel-width adaptation based on traffic demand has been studied in wireless networks with sufficient spectral resources. However, the traffic demand may not be fully satisfied in resource-limited scenarios. In this paper, we study the channel-width...
Sensor networks have attracted much attention in the recent years for its wide applications in biology, medicine, security and battlefield, etc. Data gathering is one of the most important operations in wireless sensor networks. In this paper, we present an energy-delay efficient data gathering protocol, SODG, for sensor networks while taking the transmission interference into considerations. The...
In this paper, PLF, LSFA and DKAP, three linear hydrogen-bond acidic (HBA) polymers synthesized in our laboratory and one commercial available hyperbranched HBA polymer HC were coated on 434 MHz surface acoustic wave (SAW) devices for rapid detection of volatile organic sulfur compounds (VOSCs). Sensitivity and selectivity of the polymer-coated sensors were studied by exposing to VOSCs in the concentration...
Spectrum-sLICed Elastic optical path (SLICE) networks enable elastic and flexible allocation of spectral resources. SLICE networks distribute data on a number of sub-carriers overlapped in frequency domain to provide efficient sub-wavelength and super-wavelength traffic accommodation. In SLICE networks, a routing and spectrum allocation algorithm assigns a spectrum path to any demand with just enough...
In this paper, we propose a new adaptive frequency hopping (AFH) scheme, Priority-based AFH (PAFH), for Bluetooth by introducing traffic prioritization to provide better QoS for the traffic of high priority in multi-piconet environments, especially under severe self-interference. To provide differentiated QoS, PAFH pre-classifies the whole band into non-overlapping sub hopsets that correspond to traffics...
We propose novel sub-carrier (re)allocation approaches to accommodate dynamic traffic while minimizing the reconfiguration cost in SLICE networks, with or without planning based on the traffic prediction.
Abstract-Load control is an important component of wireless resource management (RRM).It detect system load in period and provide a suitable solution to make sure that system load below threshold.Load control algorithms can be devised from a multi-cell perspective.This allows the reduction of the load in a given reference cell.In particular,this can be beneficial when service distribution is not homogeneous...
Interference nulling (IN) is a linear precoding tech-nique for downlink multiuser multiple-input multiple-output(MU-MIMO) systems. With perfect channel knowledge at the transmitter, IN eliminates other users' interference at each cell, thus improving the sum rate of the users in the system. To evaluate its suitability in a multicell setup, we have implemented the real-time system based on IN as well...
Multi-cell MIMO technique theoretically promises large improvement in spectral efficiency and fairness in cellular networks and is regarded as the key enabling technique for solving the troublesome issue of inter-cell interference. To evaluate its practical performance in the cellular network, we have implemented the real-time downlink multi-cell MIMO trial system operating over bandwidth of 20 MHz...
Partial discharge (PD) is one of the most important factors in shortening the service life of the insulation. However, it is much difficult to detect PD signal under pulse-width modulation (PWM) voltages. In this paper, signal processing model is put forward to study the factors influencing PD signal processing under square voltages based on wavelet analysis. Slew rate is an important factor influencing...
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