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Spatial subchannels in multiuser multiple-input multiple-output/orthogonal frequency-division multiplexing (MIMO/OFDM) systems are invested. With the goal of maximizing the overall system throughput, we derive the criterion of subcarrier allocation and introduce an adaptive resource allocation algorithm. Furthermore, a time-frequency blockwise loading design which may decrease the computational complexity...
With the development of cognitive radio technologies, dynamic spectrum sharing has become a promising approach to increasing the efficiency of spectrum use. This paper describes dynamic resource renting and offering mechanism for dynamic spectrum sharing in a multi cell context for OFDMA systems. A credit token based mechanism using auctioning is proposed in support of dynamic spectrum sharing between...
In mobile OFDM communication systems, Doppler spread leads to the loss of orthogonality between the sub-carriers, limiting the achievable throughput of the moving transceivers. In this paper, the effect of Doppler spread in Rayleigh fading channels is investigated, and a method of time-variant Doppler frequency estimation and compensation is proposed for mobile OFDM systems. Computer simulation results...
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