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- Pavlos Kazakopoulos, Panayotis Mertikopoulos, Aris L. Moustakas, Giuseppe Caire
- IEEE Transactions on Information Theory
- 2011

A large deviations approach is introduced, which calculates the probability density and outage probability of the multiple-input multiple-output (MIMO) mutual information, and is valid for large antenna numbers <i>N</i> . In contrast to previous asymptotic methods that only focused on the distribution close to its most probable value, this methodology… (More)

- Giacomo Bacci, Elena Veronica Belmega, Panayotis Mertikopoulos, Luca Sanguinetti
- IEEE Trans. Wireless Communications
- 2015

This work proposes a distributed power allocation scheme for maximizing energy efficiency in the uplink of orthogonal frequency-division multiple access (OFDMA)-based heterogeneous networks (HetNets) where a macro-tier is augmented with a mix of small cell access points – broadly varying in capabilities. The user equipment (UE) in the network are modeled as… (More)

In this paper, we examine the fundamental trade-off between radiated power and achieved throughput in wireless multi-carrier, multiple-input and multiple-output (MIMO) systems that vary with time in an unpredictable fashion (e.g. due to changes in the wireless medium or the users’ QoS requirements). Contrary to the static/stationary channel regime, there is… (More)

- Panayotis Mertikopoulos, William H. Sandholm
- Math. Oper. Res.
- 2016

We investigate a class of reinforcement learning dynamics in which players adjust their strategies based on their actions’ cumulative payoffs over time – specifically, by playing mixed strategies that maximize their expected cumulative payoff minus a strongly convex, regularizing penalty term. In contrast to the class of penalty functions used to define… (More)

- Joon Kwon, Panayotis Mertikopoulos
- ArXiv
- 2014

We consider a family of learning strategies for online optimization problems that evolve in continuous time and we show that they lead to no regret. From a more traditional, discrete-time viewpoint, this continuous-time approach allows us to derive the no-regret properties of a large class of discretetime algorithms including as special cases the… (More)

- Panayotis Mertikopoulos, Aris L. Moustakas
- IEEE Journal on Selected Areas in Communications
- 2008

We investigate the behavior of a large number of selfish users that are able to switch dynamically between multiple wireless access-points (possibly belonging to different standards) by introducing an iterated non-cooperative game. Users start out completely uneducated and naı̈ve but, by using a fixed set of strategies to process a broadcasted training… (More)

- Salvatore D'Oro, Laura Galluccio, Panayotis Mertikopoulos, Giacomo Morabito, Sergio Palazzo
- Computer Networks
- 2017

In this paper, we investigate the allocation of network resources (such as Flow Table entries and bandwidth) in multitenant Software-Defined Networks (SDNs) that are managed by a FlowVisor. This resource allocation problem is modeled as an auction where the FlowVisor acts as the auctioneer and the network Controllers act as the bidders. The problem is… (More)

- Panayotis Mertikopoulos, Elena Veronica Belmega, Aris L. Moustakas, Samson Lasaulce
- IEEE Journal on Selected Areas in Communications
- 2012

We analyze the problem of distributed power allocation for orthogonal multiple access channels by considering a non-cooperative game whose strategy space corresponds to the users’ distribution of transmission power over the network’s channels. When the channels are static, we find that this game admits an exact potential function and this allows us to show… (More)

- Panayotis Mertikopoulos, Elena Veronica Belmega, Aris L. Moustakas
- 2012 IEEE International Symposium on Information…
- 2012

We analyze the problem of finding the optimal signal covariance matrix for multiple-input multiple-output (MIMO) multiple access channels by using an approach based on ”ex-ponential learning”, a novel optimization method which applies more generally to (quasi-)convex problems defined over sets of positive-definite matrices (with or without… (More)

- Panayotis Mertikopoulos, Elena Veronica Belmega
- IEEE Journal on Selected Areas in Communications
- 2014

In this paper, we examine cognitive radio systems that evolve dynamically over time due to changing user and environmental conditions. To combine the advantages of orthogonal frequency division multiplexing (OFDM) and multipleinput, multiple-output (MIMO) technologies, we consider a MIMO–OFDM cognitive radio network where wireless users with multiple… (More)