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We study a cognitive channel reuse approach for autonomous femtocell deployment in an OFDMA-based cellular network. The objective is to manage the uplink interference from macrocell users to femtocell access points. Macrocell users are normally far away from the base station and may cause strong uplink interference to the close-by femtocells. By cognitive interference recognition, a femtocell access...
The ever growing demand for wireless services has placed enormous burden on valuable resources such as spectral bandwidth. Cognitive Radio (CR) with dynamic access is becoming the main trend of the next generation wireless communication system as it can greatly increase the efficiency of spectrum utilization. OFDM, which can allocate spectrum resource conveniently, is the main modulation scheme of...
The carrier frequency offset (CFO) could destroy the orthogonality of OFDM subcarriers and induce the inter-carrier interference (ICI) spread. However, the generalized multi-carrier (GMC) system reflects different interference characters in the presence of CFO. In this paper, we exactly analyze the CFO effect on GMC, which multiplexes several single band single carrier based frequency division multiple...
We propose a methodology to evaluate the voice-over-IP (VoIP) capacity and performance of orthogonal frequency-division multiple-access (OFDMA)-based systems. The approach combines the queuing and interference analyses to find the delay and power outage. Using this analytical framework, we provide insight into tradeoffs among capacity-limiting factors, including channel dimensions, power, interference...
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