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We study the energy-optimal subcarrier power allocation for OFDM-based cognitive radio (CR) networks. A CR transmitter communicates with CR receivers on a channel borrowed from licensed primary users (PUs) when PUs' transmission are detected absence on those channels. Due to non-orthogonality of the transmitted signals in the adjacent bands, both the PU and the secondary user (SU) cause mutual-interference...
To extend indoor coverage and offload cellular network traffic, femtocell technology becomes more promising. Multi-carrier spread spectrum technology has proven to be effective in multiple access and provides robust performance in fading radio channels. In this paper, VSF-OFCDM is utilized for sub-carrier allocation with two dimensional spreading (2D) for femto users (FUEs) in small cells that are...
The downlink subcarrier allocation in a cooperative multiuser system with an amplify-and-forward relaying is studied for OFDM systems. We use the cooperation coefficient (Γ) from the literature as a basis for subcarrier allocation. Mean of the coefficient is first derived for Rayleigh faded channel. Then, a well known subcarrier allocation algorithm namely Max-Min is modified to make use of Γ. In...
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