of this work is to assess the impact of such MU detecPacketized random access based on Code Division Multiple Access (CDMA) is considered. Our primary aim is to assess the impact of (uncoded) multi-user (MU) detectors on the performance of CDMA with slotted ALOHA. The impact of respective multiple packet reception capability for the matched filter and MMSE detector on delay/throughput improveme...

In this paper, a simple frame size adjustment of dynamic framed slotted Aloha for tag identification in RFID networks is proposed. In dynamic framed slotted Aloha, the reader is required to announce the frame size for every frame. To achieve maximum system efficiency, it is essential to set the frame size according to the number unidentified tags appropriately. The proposed approach utilizes th...

Silvano Pupolin , Luciano Tomba , Michele Zorzi Dipartimento di Elettronica e Informatica, University of Padova Via G. Gradenigo 6/A, I-35131 Padova (Italy) Dipartimento di Elettronica e Informazione, Politecnico of Milano Piazza Leonardo da Vinci 32, I-20133 Milano (Italy) Abstract—The actual trend towards Personal Communication Systems suggests to devote considerable research efforts to find ...

We propose a frame slotted ALOHA (FSA)-based protocol for random access network where sources transmit status updates to their intended destinations. evaluate the effect of such on network’s timeliness performance using Age Information (AoI) metric. Specifically, we leverage tools from stochastic geometry model spatial positions source-destination pairs and capture entanglement amongst nodes’ s...

In this paper, we describe our work on developing and evaluating detailed OPNET simulation models of an enhanced Very Small Aperture Terminal (VSAT) satellite Internet gateway and an enhanced satellite hub based on Cerona SkySPAN technology with capacity and latency optimizations in the return channel so as to allow significantly higher number of users and a better user experience. The Cerona S...

A multichannel reservation-based channel-access protocol is investigated in this paper. Under this protocol, one channel is used to exchange reservation messages and the remaining channels are used for information-bearing trajjic. The performance of this scheme is compared to that of a singlechannel reservation-based protocol. A simple contentionbased slotted-Aloha protocol is also considered. ...

We consider the problem of stability of slotted ALOHA for a system consisting of N users communicating with a common receiver, which employs spatial diversity to receive multiple transmissions simultaneuosly. We introduce a general packet reception model to incorporate multiple packet receptions since the collision channel model is no longer valid in such a scenario. We characterize the stabili...

For the slotted ALOHA protocol in a mobile radio environment, a retransmission control scheme is proposed, and a rigorous analysis is developed to prove the stability of the resulting system. This analysis is shown to apply to virtually any model for the spatial distribution of the users. It is also shown that the use of retransmission control is unavoidable if the network performance predicted...