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A full-duplex radio over fiber link scheme with 16 quadrature amplitude modulation (16-QAM) 10 Gb/s downstream and 2.5 Gb/s upstream signals is proposed. In the downlink, the 60 GHz dual-tone optical millimeter-(mm-) wave signal carrier is generated by the 15 GHz local oscillator via a Mach-Zehnder modulator with frequency quadrupling. The 16-QAM 5 GHz IF signal is up-converted to 65 GHz by modulating...
In this paper, we consider a rural infostation system where power and bandwidth limited infostations are deployed in a large network area with sparsely populated mobile nodes. Direct transmission services are provided to each mobile node, whereas message dissemination services facilitated by relaying are provided to a subgroup of mobile nodes. We investigate radio resource allocation at infostations,...
In this paper, we consider a wireless communication network for both low-speed mobile nodes in densely populated hotspots and high-speed mobile nodes roaming in a large area. Wireless local area networks (WLANs) are deployed in the hotspots, while a delay/disruption tolerant network (DTN) provides services to roaming nodes in the large area with low node density. We investigate radio resource allocation...
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