2016 IEEE International Conference on Communications Workshops (ICC)

Device-free localization (DFL) systems have emerged in the last years as a powerful technology for tracking mobile targets without the need of radio tags. Perturbations induced by moving objects on the electromagnetic (EM) wavefield generated by a dense wireless network are measured and processed by the DFL system to track target trajectories. Despite several solutions have been explored in the li... View full abstract»

This paper presents ways of enhancing the performance of spatial shift keying (SSK) in optical wireless communication systems with correlated channel gains. One method involves varying the pulse width and the other involve varying the pulse amplitude to provide additional differentiation to the signal transmitted by each optical source. Closed form expressions are derived for the error performance... View full abstract»

We present a novel 2D-MUSIC algorithm that can jointly estimate the angles and times of arrival of multiple signals in the presence of local scattering. We focus on a scenario where the received signal is a sum of “clusters”, and each cluster is composed of multi-incident rays that show similar angles and times of arrival. The setting is composed of a Single-Input-Multiple-Output (SIMO) link where... View full abstract»

In this work, a synchronization algorithm for visible light communication power switched baseband modulation forms is elaborated. Based on the equal received signal energy content during a bit time, a dedicated convolution and summation scheme is developed, where the minimum of the summation formula indicates the start of a bit time. It is shown that the functionality of the algorithm is invariant... View full abstract»

This paper presents a novel and unique concept of color cell (CC) for bidirectional visible light communications (VLCs). The proposed CC based VLC provides a comprehensive and practical solution to the issues associated with full coverage and user mobility in a comparatively larger indoor environment. In the CC scheme, color filter array (CFA) is utilized at the receiver end with a novel user mobi... View full abstract»

The problem of estimating receiver-sender node positions from measured receiver-sender distances is a key issue in different applications such as microphone array calibration, radio antenna array calibration, mapping and positioning using UWB and mapping and positioning using round-trip-time measurements between mobile phones and Wi-Fi-units. Thanks to recent research in this area we have an incre... View full abstract»

In this work, we present novel Architectural Design Patterns towards open, cloud-based 5G communications. We provide a brief classification of technologies that cannot be ignored in the design process of 5G systems and illustrate how a new technological added value can be created, when current methodologies, design paradigms, as well as design patterns and their extensions are properly exploited i... View full abstract»

Zone-level occupancy tracking is a critical technology for smart buildings and can be used for applications such as building energy management, surveillance, and security. Existing occupancy tracking techniques typically require installation of large number of occupancy monitoring sensors inside a building as well as an established network. In this study, in order to achieve occupancy tracking, we... View full abstract»

While physically disabled people usually do not need to be followed by educators, the circumstances are reversed when dealing with patients affected by any form of mental illness. In this cases, the main focus should be on personal awareness and social rehabilitation requirements. In this context, the increasing availability of broadband technology at home, along with wireless (sensor) networks an... View full abstract»

Requirements and use cases for the 5G era are demanding in key dimensions such as throughput, latency, scalability, convergence and automation. From these, an end-to-end architectural vision has been developed in a holistic way and including novel architectural concepts such as 5G access domain, next generation fixed, programmable transport and 5G era horizontal layers in conjunction with cloud, s... View full abstract»

We propose an optical-wireless 5G infrastructure offering converged fronthauling/backhauling functions to support both operational and end-user cloud services. A layered architectural structure required to efficiently support these services is shown. The data plane performance of the proposed infrastructure is evaluated in terms of energy consumption and service delay through a novel modelling fra... View full abstract»

Wireless localization systems are of great importance for a variety of modern applications. Recently, cooperation among agents (nodes with unknown positions) becomes attractive in localization networks, especially in the infrastructure-limited scenario. In many cases, synchronization of the agents' clocks to the anchors (nodes with known positions) has to be performed together with the localizatio... View full abstract»

The 5G vision is to create a network that outperforms the current mobile networks in terms of flexibility, performance and use cases. This raises the requirements of the network to a totally new level. In order to achieve the latency goals the related applications and network functions need to be placed into the network edge. Full mobility support requires also enhancements to the current mobility... View full abstract»

Based on the Cloud-Radio Access Network (C-RAN) structure and massive Multi-Input Multi-Output (MIMO), we propose one comprehensive system model and give the Energy Efficiency (EE) analysis of this system. The C-RAN structure is amended for better antenna control in massive MIMO based C-RAN system model. Furthermore, system EE optimization problem is modeled from a comprehensive way, and its solut... View full abstract»

Three-node full-duplex is a promising new transmission mode between a full-duplex capable wireless node and two other wireless nodes that use half-duplex transmission and reception respectively. Although three-node full-duplex transmissions can increase the spectral efficiency without requiring full-duplex capability of user devices, inter-node interference - in addition to the inherent self-inter... View full abstract»

With the ever-increasing demand for data traffic, high dense cellular networks are gaining extensive attention. But at the same time dense deployment of small cells results in high energy consumption and operating cost. Sleep mode for high dense cellular networks is emerging as a promising way to meet green communication. The aim of this paper is to use the two-stage strategy for reducing the ener... View full abstract»

We propose a pilot decontamination method for noncooperative cellular massive MIMO systems using pilot and data alignment in the time-frequency plane. In this method, pilot and data channels are assigned such that the terminals in any two adjacent cells operate over non-overlapping pilot channels but the terminals may share data channels. The former condition is imposed to circumvent pilot contami... View full abstract»

Recent work has demonstrated the advantage of full-duplex (FD) network over half-duplex (HD) network in bidirectional sum rate under the assumption of full-buffer and symmetric uplink-downlink traffics. In this paper, we consider asymmetric bidirectional traffics, and study the performance gain of FD network over both the traditional time-division duplex (TDD) network with static time slot splitti... View full abstract»

In this paper, the impact of in-band full-duplex (IBFD) wireless communications on secret key generation via physical layer channel state information is investigated. A key generation strategy for IBFD wireless devices to increase the rate of generated secret keys over multipath fading channels is proposed. Conventionally, due to the half-duplex (HD) constraint on wireless transmissions, sensing s... View full abstract»

Physical Layer Security (PHYSEC) has the potential to offer substantial advantages for key management for small resource-constrained devices. In this paper, we investigate two PHYSEC primitives: channel reciprocity based key generation (CRKG) and channel reciprocity based relay detection (CRRD). The security and entry performance of such systems in real-world scenarios are still open research ques... View full abstract»

Public key based authentication is not amenable for implementation in IoT environments due to its high complexity and resource requirements. In this paper, we propose a low-complexity scalable authentication framework suitable for low-power IoT environments and applications that uses physical layer information obtained from prior legitimate communications between the two parties as the source of s... View full abstract»