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In this paper we investigate the optimum power allocation in a random access wireless orthogonal frequency division multiple access (OFDMA) communication system with multiple source and multiple destination nodes. The multiple sources in the system each transmits information to multiple destinations at a fixed signal to noise ratio (SNR) target and cooperates via an orthogonal amplify and forward...
Two-tier networks, comprising a conventional cellular network overlaid with shorter range hotspots (e.g. femtocells, distributed antennas, or wired relays), offer an economically viable way to improve cellular system capacity. The capacity-limiting factor in such networks is interference. The cross-tier interference between macrocells and femtocells can suffocate the capacity due to the near-far problem,...
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