Parametric channel estimation for massive MIMO

Channel state information is crucial to achieving the capacity of multi-antenna (MIMO) wireless communication systems. It requires estimating the channel matrix. This estimation task is studied, considering a sparse channel model particularly suited to millimeter wave propagation, as well as a general measurement model taking into account hybrid architectures. The contribution is twofold. First, the Cram{\'e}r-Rao bound in this context is derived. Second, interpretation of the Fisher Information Matrix structure allows to assess the role of system parameters, as well as to propose asymptotically optimal and computationally efficient estimation algorithms

An Ultra-Wide Band Umbilical Cord for Cognitive Radio Systems

This paper describes how Cognitive Radio (CR) could benefit from Software-Defined Radio (SDR) compatible Ultra-Wide Band (UWB) systems. It introduces the notion of umbilical cord that can keep a CR device connected to its surrounding world, thanks to sensing and low speed over-the-air reconfiguration (OTAR) means provided by Low-Data Rate (LDR) systems, and to fast OTAR downloading facilities based on High-Data Rate (HDR) hot spots. A particular UWB architecture supporting SDR-compatible technological constraints is proposed as candidate to realize this promising combination of capabilities

Global Throughput Maximization of a Hybrid Unicast-Broadcast Network for Linear Services

International audienceAn exponential growth of the mobile data traffic is expected in future networks. The reason of this growth is related to the increasing popularity of linear services such as mobile TV, live and sports events, which may lead to the delivery of the same contents to a large audience. Recent studies have shown that network cooperation is a promising candidate to deal with such an issue. This paper investigates, from a planning perspective, the optimization of a hybrid unicast/broadcast network for linear services. We introduce an analytical approach with the aim of stating an optimization problem on the hybrid network configuration, namely in terms of the sharing between the unicast and broadcast modes to deliver a particular service. We show by simulation the existence of an optimal operation point which leads to the maximization of the overall throughput of the hybrid network under the constraint of a minimum service success rate

A Multi-Band IR-UWB HDR Transceiver: Architecture and Indoor Channel Measurements

ISBN: 978-1-4244-4316-1 - WOSInternational audienceThis paper presents an architecture of a lowpower non-coherent multi-band IR-UWB transceiver. The proposed system was studied and a prototype was realized. Also, it concerns with the study of the performance and a future implementation of such a system based on energy detection. Channel measurements performed in both LOS and NLOS short-range communications in real indoor environment are provided. Finally, the performance of a communicating system based on energy detection and a data rate evaluation are given