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Fractional frequency reuse (FFR) and soft frequency reuse (SFR) are efficient interference avoidance techniques for emerging OFDMA cellular networks in improving system performance by regularly reusing the frequencies. In this paper, we evaluate the energy efficiency (EE) in bits/J and EE per channel per cell in bits/J/Hz/cell for both the static FFR and SFR systems, in Nakagami-m fading and path-loss...
This paper explores the attributes, layering models and objective functions in cross layer designs for mobile ad hoc wireless networks by taking all the statistical characteristics and constraints from the physical (PHY) layer, media access control (MAC) layer and network (NET) layer into consideration. This paper reviews the entire network optimization across all the PHY/MAC/NET layers. At the PHY...
In this paper, we propose a cognitive radio-based multi-user resource allocation framework for mobile ad hoc networks using multi-carrier DS CDMA modulation over a frequency-selective fading channel. In particular, given pre-existing communications in the spectrum where the system is operating, in addition to potential narrow-band interference, a channel sensing and estimation mechanism is provided...
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