A. P. Petropulu

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In this paper, we propose a new media access protocol for wireless networks, that due to its ability to resolve collisions can achieve high throughput. We view the wireless network as a spatially distributed antenna with antenna elements linked via the wireless channel. When there is a collision, the collided packets are saved in a buffer. In the slots(More)
ALLIANCES is a new cooperative random access protocol which was proposed for resolving collisions in wireless networks. It can achieve high throughput and enables efficient use of energy with minimal scheduling overhead. The initial ALLIANCES approach was designed based on a small-scale network with fixed infrastructure, i.e., there is a base station (BS)(More)
A cooperation-based medium access protocol for wireless networks was recently proposed, that through its ability to resolve collisions can achieve high throughput. In this paper, we propose a new scheme for collision resolution that combines the idea of cooperative retransmissions and use of multi-beam adaptive arrays (MBAA) at the base station (BS). In the(More)
We present a novel framework for the identification of a multiple-input multiple-output (MIMO) system driven by white, mutually independent unobservable inputs. Samples of the system frequency response are obtained based on parallel factorization (PARAFAC) of three- or four-way tensors constructed based on, respectively, third- or fourth-order cross spectra(More)
It has been well established by now that high-speed wireline traffic exhibits self-similar behavior. Due to the important consequences of traffic self-similarity in network design, several studies have assumed that wireless traffic is also self-similar and looked at its effects on network performance. However, due to factors such as power limitations and(More)
Real packet channels are characterized by losses and delays as they both affect the performance of applications. A large number of techniques have been proposed in the literature for coding and recovery of lost information. In this paper we introduce a design framework to analyze, the impact of packet interleaving at the transmitter on the quality of(More)
Cooperative transmission schemes have recently been proposed to improve the uplink performance of wireless communications systems by increasing diversity without requiring use of multiple transmit antennas. We here propose a novel cooperative scheme that performs distributed coding of user data, uses only one channel per user and allows a flexible tradeoff(More)
Traditional medium access control protocols are designed to avoid collisions. However, due to the random arrival nature of the network traffic, collisions cannot be completely avoided in a decentralized fashion. Recently a random access protocol for wireless networks was proposed that via cooperation of network nodes can resolve collisions and thus achieve(More)
We consider the problem of frequency domain identification of a convolutive multiple-input multiple-output (MIMO) system driven by white, mutually independent unobservable inputs. In particular, we improve upon a method recently proposed that uses PARAFAC decomposition of a tensor that is formed based on third-order statistics of the system output. The(More)
A new medium access protocol for wireless networks based on cooperative retransmissions was recently proposed in [1], [2], that through its ability to resolve collisions can achieve high throughput. In this paper, we propose a new scheme for collision resolution that combines the idea of cooperative retransmissions and use of multiple-beam adaptive arrays(More)