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This paper presents a new cross-layer resource allocation model for multiuser packet-based Orthogonal Frequency Division Multiplexing (OFDM) systems, where the packet arrival process, delay QoS in the application layer and the subcarrier conditions for all users in the physical layer are considered in the MAC layer design. The objective of the proposed(More)
In this paper a novel time and frequency synchronization method for orthogonal frequency-division multiplexing (OFDM) system is proposed. Preamble symbols are not used for synchronization like traditional solutions, thus the overhead of preambles can be eliminated and the spectrum efficiency of the system can be increased greatly, especially for short data(More)
A new scheme, selective time domain filtering, that has significantly reduced complexity compared to the SLM scheme, which only relies on conventional channel estimation and demodulation techniques for multipath fading channels to recover the data, is proposed. Computer simulations indicate that the new scheme suffers only a small loss in performance in(More)
Though cooperative relaying is believed to be a promising technology to improve the energy efficiency of cellular networks, the relays’ static power consumption might worsen the energy efficiency therefore can not be neglected. In this paper, we focus on whether and how the energy efficiency of cellular networks can be improved via relays. Based on the(More)