Multi-beam array antennas are being deployed in wireless cellular networks to implement space division multiple access (SDMA), using various forms of antenna sectorization, as a means to increasing the capacity of these networks. In this paper we propose a dynamic beam-forming strategy which provides superior SDMA performance. Specifically, we propose successive splitting of an original wide angle beam so as to spatially separate a number of initially interfering transmitters. This is shown to result in very drastic reductions in delays and computational loads while incurring no throughput penalties compared to standard random access protocols.
Modern optical transmission technology using wavelength division multiplexing can support aggregate transmission speeds on the order of hundreds of gigabits per second, but photonic switching speeds are relatively more constrained at the present time. Burst switching has recently been proposed as a solution, where long segments of data with identical destinations and quality-of-service objectives are handled together as unified switchable entities. In this paper we examine application of this concept to video-on-demand servers, and analyze the performance. A burst-switching distributed-server architecture is proposed. It is shown that the switch performance may be enhanced by using recent concepts of bifurcated input queueing switches.
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