We study photonic packet switching architecture that enables high node throughput and provides priority services. While an ultra-high-speed address-lookup capability can be realized in the optical domain for a photonic packet switch, the optical buffer must be managed in the electrical domain. In this paper, we propose a photonic buffer architecture that can support prioritized buffer managemen...

This paper introduces a collisionless wavelength division multiple access protocol for a passive star-coupled photonic network and shows that it possesses significant performance and flexibility advantages over alternative approaches. A performance modeling technique is introduced, basedon a semi-markov analytic model, that eliminates many of the unrealistic assumptions of past approaches to an...

The temporal and spatial coherence widths of the microscopic process by which a neutrino is detected are incorporated in the quantum mechanical wave packet treatment of neutrino oscillations, confirming the observation of Kiers, Nussinov and Weiss that an accurate measurement of the energies of the particles participating in the detection process can increase the coherence length. However, the ...

In recent years, AQM (Active Queue Management) mechanisms, which support the end-to-end congestion control mechanism of TCP (Transmission Control Protocol), have been widely studied. The AQM mechanism is a congestion control mechanism at a router to control its queue length by actively discarding arriving packets. Many AQM mechanisms such as RED (Random Early Detection) have been proposed. Howe...

A p-persistent CSMA protocol suitable for packetized mobile radiotelephone cellular networks with capture and a number of mobile terminals transmitting to a common receiver is considered. In a micro-cellular environment, messages from different transmitting terminals will suffer different attenuations (path loss and fading phenomena), yielding different levels of energy at the receiver. Thus, o...

In this paper, a hybrid overlay/underlay cognitive radio system is modeled as an M/M/1 queue where the rate of arrival and the service capacity are subject to Poisson alternations. Each packet as a customer arriving at the queue makes a decision to join the queue or not. Upon arrival, the individual decision of each packet is optimized based on his observation about the queue length and the sta...

In present packet-based wireless OFDM systems, such as IEEE802.11a/g, a preamble technique is used to accomplish the synchronization functions. Although this technique is well-developed, delay and bitrate loss due to preamble motivate us to adapt the superimposed pilot technique as an alternative approach for synchronization. In this paper1, we study the spectral bitrate loss due to both techni...

It is commonly believed that collision protocols are impractical for very fast bus networks, owing to the constraints on the minimum packet length. In this paper, we present two collision protocols that contradict this opinion. These protocols are two representatives of the so-called Piggyback Ethernet family. They incur no synchronisa-tion overhead under very light load, and under heavy traac ...