Nicola Varanese

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The establishment of a common frequency reference in a distributed wireless network is a critical factor in enabling cooperative communication strategies. In this paper we employ distributed locked loops to entrain the frequencies of autonomous nodes with wireless communication capabilities. Leveraging recent results from the literature on distributed(More)
In this paper, two types of MIMO amplify-and-forward relay systems are considered: multi-hop and cooperative. For both cases, the problem of maximizing the achievable rate over the covariance matrices of the symbols transmitted by the source and relay linear processing matrix is formulated under the assumption of full channel state information at each node.(More)
In this paper, we consider a fading relay channel operating according to the amplify-and-forward protocol, where each node has full CSI and multiple-antennas are deployed at the relay node. Maximization of the achievable rate with respect to the linear processing at the relay and the power allocation at the source and relay is performed under an(More)
In infrastructure-less wireless systems network-wise time and frequency synchronization can be achieved by exchanging mutual synchronization errors among neighboring nodes. Cooperative synchronization is based on the use of distributed digital locked loops (D-DLLs), as the extension to distributed systems of the classical concept of (analog or digital)(More)
DISTRIBUTED SYNCHRONIZATION ALGORITHMS FOR WIRELESS SENSOR NETWORKS by Nicola Varanese The ability to distribute time and frequency among a large population of interacting agents is of interest for diverse disciplines, inasmuch as it enables to carry out complex cooperative tasks. In a wireless sensor network (WSN), time/frequency synchronization allows the(More)
Network synchronization can improve the performance of wireless networks in several ways, such as by enabling the use of slotted medium access protocols. Distributed synchronization is an appealing technique to achieve network synchronization in wireless ad-hoc and sensor networks. At the MAC layer, different signaling techniques and medium access protocols(More)
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