The growing demand of mobile multicast services such as IPTV and video streaming requires effective radio resource management (RRM) to handle traffic with strict Quality of Service constraints over Long Term Evolution (LTE) and beyond systems. Special care is needed to limit the system performance degradation when multiple multicast streams are simultaneously transmitted. To this […]
Read moreMobile data traffic is expected to increase 11-fold between 2013 and 2018. A more dynamic and flexible network is needed to cope with the growing data volume. Software defined networking (SDN) enabled by, for example, the OpenFlow protocol is a potential solution to improve the flexibility and agility of the mobile data network by decoupling […]
Read moreThe use of wirelessly internetworked miniaturized biomedical devices is promising a significant leap forward in medical treatment of many pervasive diseases. Recognizing the limitations of traditional radio-frequency wireless communications in interconnecting devices within the human body, in this paper, we propose for the first time to develop network protocols for implantable devices based on ultrasonic transmissions. We start off by […]
Read more
No Comments
The NLMS Algorithm with Time-Variant Optimum Stepsize Derived from a Bayesian Network Perspective
In this letter, we derive a new stepsize adaptation for the normalized least mean square algorithm (NLMS) by describing the task of linear acoustic echo cancellation from a Bayesian network perspective. Similar to the well-known Kalman filter equations, we model the acoustic wave propagation from the loudspeaker to the microphone by a latent state vector […]
Read moreCognitive radio is a potential technique to solve the spectrum shortage problem in wireless communications. Integrating wireless relaying into the cognitive radio networks can further improve the spectrum efficiency. In this study, a multiple-input multiple-output cognitive relay network is considered, where the primary network (PN) consists of one transmitter-receiver pair and the secondary network consists […]
Read moreTo increase the energy efficiency of Ethernet networks, in 2010, the IEEE published the IEEE 802.3az amendment, known as Energy Efficient Ethernet (EEE). The amendment introduces a new operational mode, defined as Low Power Idle (LPI), that allows to considerably reduce the power consumption of inactive Ethernet links. In this paper, we address the application […]
Read more
No Comments
An Opportunistic Transmission Protocol for Body Sensor Networks using RSSI and on-board accelerometer
Inter-communication between nodes in Body Sensor Networks can be interrupted by body movement. Body parts can reflect and absorb radio frequencies or block the radio signal that can disrupt the radio communication. In this paper, we have proposed an opportunistic radio transmission that uses the Received Signal Strength Indicator as feedback mechanism to improve the […]
Read more
No Comments
Folded Cavity-Backed Crossed-Slot Antenna
A folded, cavity-backed crossed-slot antenna is proposed for antenna miniaturization. The cavity dimensions of a conventional cavity-backed crossed-slot antenna are about a half-guided-wavelength along each side, which is unsuitable in many applications like a handheld device or body area network(BAN). To reduce the size of the cavity, a folded cavity is proposed in this letter. The center plate […]
Read moreNon-invasive human sensing based on radio signals has attracted numerous research interests and fostered a broad range of innovative applications of localization, gesture recognition, smart health-care, etc, for which a primary primitive is to detect human presence. Previous works have studied to detect moving humans via signal variations caused by human movements. For stationary people, […]
Read more
No Comments
Coordinated voltage control in distribution grids with LTE based communication infrastructure
In modern distribution grids voltage problems are likely to be more common and more significant, due to the high penetration of Distributed Generation (DG) that can vary their in-feed in short times. Coordinating these DGs, either in a centralized or distributed fashion, to maintain voltage at prescribed limits may be one effective solution. However, this […]
Read more