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1 Summary The Radon-Nikodym derivative between a centered fractional Brownian motion Z and the same process with constant drift is derived by nding an integral transformation which changes Z to a process with independent increments. A representation of Z through a standard Brownian motion on a nite interval is given. The maximum likelihood estimator of the… (More)

- Esa Hyytiä, Pasi E. Lassila, Jorma T. Virtamo
- IEEE Transactions on Mobile Computing
- 2006

The random waypoint model (RWP) is one of the most widely used mobility models in performance analysis of ad hoc networks. We analyze the stationary spatial distribution of a node moving according to the RWP model in a given convex area. For this, we give an explicit expression, which is in the form of a one-dimensional integral giving the density up to a… (More)

- Esa Hyytiä, Jorma T. Virtamo
- Wireless Networks
- 2007

In this paper we study the so-called random waypoint (RWP) mobility model in the context of cellular networks. In the RWP model the nodes, i.e. mobile users, move along a zigzag path consisting of straight legs from one waypoint to the next. Each waypoint is assumed to be drawn from the uniform distribution over the given convex domain. In this paper we… (More)

- Esa Hyytiä, Jorma T. Virtamo
- EURASIP J. Wireless Comm. and Networking
- 2007

Recommended by Stavros Toumpis We study the load balancing problem in a dense wireless multihop network, where a typical path consists of a large number of hops, that is, the spatial scales of a typical distance between source and destination and mean distance between the neighboring nodes are strongly separated. In this limit, we present a general… (More)

- E. Hyytia, J. Virtamo
- 2006 2nd Conference on Next Generation Internet…
- 2006

We study the load balancing problem in a dense wireless multihop network, where a typical path consists of large number of hops, i.e., the spatial scales of a typical distance between source and destination, and mean distance between the neighboring nodes are strongly separated. In this limit, we present a general framework for analyzing the traffic load… (More)

- Thomas Bonald, Laurent Massoulié, Alexandre Proutière, Jorma T. Virtamo
- Queueing Syst.
- 2006

We compare the performance of three usual allocations, namely max-min fairness, proportional fairness and balanced fairness, in a communication network whose resources are shared by a random number of data flows. The model consists of a network of processor-sharing queues. The vector of service rates, which is constrained by some compact, convex capacity… (More)

- Esa Hyytiä, Jorma T. Virtamo, Pasi E. Lassila, Jussi Kangasharju, Jörg Ott
- INFOCOM
- 2011

—We consider an opportunistic content sharing system designed to store and distribute local spatio-temporal " floating " information in uncoordinated P2P fashion relying solely on the mobile nodes passing through the area of interest, referred to as the anchor zone. Nodes within the anchor zone exchange the information in opportunistic manner, i.e.,… (More)

— Fountain coding principle introduced by Byers et al. in 1998 describes an efficient way to transfer information over erasure channels. In this paper, we focus on a particular class of fountain codes, the LT codes. The key component of LT codes is the so-called degree distribution used in the encoding procedure. The degree distribution is the sole… (More)

- Ilkka Norros, James W. Roberts, Alain Simonian, Jorma T. Virtamo
- IEEE Journal on Selected Areas in Communications
- 1991

- Esa Hyytiä, Tuomas Tirronen, Jorma T. Virtamo
- IEEE INFOCOM 2007 - 26th IEEE International…
- 2007

Fountain codes provide an efficient way to transfer information over erasure channels. We give an exact performance analysis of a specific type of fountain codes, called LT codes, when the message length N is small. Two different approaches are developed. In a Markov chain approach the state space explosion, even with reduction based on permutation… (More)