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In this paper we study the application of Diversity Coding to enable near-instantaneous recovery from link failures in 5G wireless Cloud Radio Access Network (C-RAN) networks. We focus on networks where remote radio heads in a C-RAN are connected to the baseband unit in two hierarchical tiers with optical and wireless fronthaul links. In order to avoid retransmissions and re-routing delays due to...
Multicell cooperation in 5G next-generation wireless networks is essential to increasing multiuser channel capacity. Multiple base stations need to coherently process their transmitted (or received) data streams to mitigate inter-cell interference and achieve significant diversity gains. This is only possible if the correct base stations are selected. As users demand higher data rates at higher mobility,...
In this paper we study the application of Diversity Coding to enable near-instantaneous recovery from link failures in 5G Centralized Radio Access Network (C-RAN) networks. We focus on networks where remote radio heads in a C-RAN are connected to the baseband unit with wireless fronthaul links. In order to avoid retransmissions and rerouting delays due to link failures, we investigate use Diversity...
Next generation 5G wireless networks pose several important security challenges. One fundamental challenge is key management between the two communicating parties. The goal is to establish a common secret key through an unsecured wireless medium. In this paper, we introduce a new physical layer paradigm for secure key exchange between the legitimate communication parties in the presence of a passive...
Energy efficiency is essential for Wireless Body Area Network (WBAN) applications because of the battery-operated nodes. Other requirements such as throughput, delay, quality of service, and security levels also need to be considered in optimizing the network design. In this paper, we study the case in which the nodes access the medium probabilistically and we formulate an energy efficiency optimization...
Network life time of Wireless Body Area Network (WBANs) is essential for its operation. An integral part of the network life time is the energy efficiency of the devices and enabling their transmissions with the optimal choice of Physical layer (PHY) and Medium Access Control (MAC) parameters. Particularly, in the next generation wireless networks, where devices and sensors are heterogeneous and coexist...
Atrial fibrillation (AF) is the most common cardiac arrhythmia and is associated with an increased risk of stroke and mortality. Research into the prediction of AF onset has been motivated by the necessity to develop better pacing therapy to reduce the incidence of AF and maintain the heart's normal sinus rhythm. In this paper, we address a similar problem to that posed in the Computers in Cardiology...
Advances in sensor networks enable pervasive health monitoring and patient-specific treatments that take into account the patients medical history, current state, genetic background, and personal habits. However, sensors are often battery power limited and vastly differ in their application related requirements. In this paper, we address both of these problems. Specifically, we study IEEE 802.15.6...
Technological advances in biomedical engineering have significantly improved the quality of life and increased the life expectancy of many people. One component of such advanced technologies is represented by wireless in vivo sensors and actuators, such as pacemakers, internal drug delivery devices, nerve stimulators, and wireless capsule endoscopes (WCEs). In vivo wireless body area networks (WBANs)and...
We are in the midst of a major change in mobile wireless networks. Driven by the massive number of mobile-connected devices and the constant increase in the data rates, the primary objective of wireless network operators has been to satisfy the throughput of users and maximize the network capacity. However, this has lead to an energy inefficient network design. Our goal in this paper is to discuss...
Massive MIMO (multiple-input multiple-output) antenna technology can provide significant performance improvement for cellular systems in terms of both throughput and energy efficiency. It is widely recognized that inter-user interference can be eliminated with a large number of antennas because of the asymptotical orthogonality among users when linear MF (Matched Filter) downlink precoding is used...
Massive MIMO (multiple-input multiple-output) antenna technology can provide significant performance improvement for cellular systems in terms of both throughput and energy efficiency. It is widely recognized that inter-user interference can be eliminated with a large number of antennas because of the asymptotical orthogonality among users when linear MF (Matched Filter) downlink precoding is used...
Wireless communications are increasingly important in health-care applications, particularly in those that use implantable medical devices (IMDs). Such systems have many advantages in providing remote healthcare in terms of monitoring, treatment and prediction for critical cases. However, the existence of malicious adversaries, referred to as nodes, which attempt to control implanted devices, constitutes...
We are designing an integrated wireless Vectorcardiogram (iVCG) that is portable and worn on the chest of the patient and is capable of continuously recording and transmitting the heart vector, which is a comprehensive measure of the electrical activity of the heart. The VCG contains the same information as the classic electrocardiogram (ECG). Although a physician or trained technician will initially...
In this paper, we explore user-specific QoS requirements and associated schedulers that are very critical in optimizing the spectral allocation for wireless systems. Two user-specific QoS aware schedulers are proposed that considers the user-specific QoS requirements in the allocation of resources. Depending upon whether improving the MOS (Mean Opinion Score) or both the system capacity and the MOS...
Channel modeling is of fundamental importance for in vivo wireless communication, since it is essential in order to optimize transmitter and receiver signal processing. In this paper, we build a phenomenological model for the distance and frequency dependent path loss of the in vivo wireless channel. Measured data is produced through HFSS simulations in the range of 0.4–6 GHz for frequency and λ/50–3λ...
We are designing an integrated wireless Vectorcardiogram (iVCG) that is portable and placed on the chest of the patient and is capable of recording and transmitting cardiac rhythm signals. We present a solution to the problem of transforming the three VCG component signals to the familiar 12-lead ECG for the convenience of cardiologists. The least squares (LS) method is employed on the VCG signals...
This paper describes how user-specific QoS requirements may improve spectral utilization in heterogeneous networks. Throughput improvements of FTP (File Transfer Protocol) applications benefiting from the rate adaptation and MAC scheduling algorithms for video applications that incorporate user-specific QoS to improve system capacity are demonstrated. These improvements are achieved while user satisfaction...
In vivo wireless communications and networking of biomedical devices has the potential of being a critical component in advancing health care delivery. Such systems offer the promise of improving the effectiveness of sophisticated cyber-physical biomedical systems. This paper provides an overview of our research on characterizing the in vivo wireless channel and contrasting this channel with the familiar...
Our long-term research goal is to model the in vivo wireless channel. As a first step towards this goal, in this paper we performed in vivo path loss measurements at 2.4 GHz and make a comparison with free space path loss. We calculate the path loss by using the electric field radiated by a Hertzian-Dipole located inside the abdominal cavity. The simulations quantify and confirm that the path loss...
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