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A novel carrier sensing method with self-cancelation of the inter-carrier emission inevitably existent in OFDMA-based coexisting systems is proposed. Different from the conventional energy-based carrier detector, which directly compares the carrier energy with some predefined thresholds without considering such inter-carrier emissions, our proposed method can remove them before making decision, thus...
In this paper, we address the problem of subchannel, rate and power allocation in OFDM-based two-tier femtocell networks, which comprise a conventional macrocell and multiple femtocells. Our objective is maximizing the multiple femtocell users' weighted rate sum by jointly adjusting their subchannel, rate and power allocation, under the constraints of cross-tier interference (CTI) between macrocell...
Relay selection and subchannel pairing are important issues in OFDM based cooperative wireless systems to improve the system performance and reliability. Most of the relay selection schemes in modern literatures are centralized under the assumption that the overall channel condition is known at the source node, each relay node and the destination node which is impractical. In this paper, we will propose...
In OFDM systems, when the cyclic prefix (CP) is shorter than the channel order, a time domain equalizer (TEQ) is needed to partially equalize the channel to constrain its impulse response to a predetermined length. This paper derives sufficient conditions under which the time domain equalization is optimum in producing maximum throughput. A new criterion of TEQ design is proposed under the guidance...
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