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Cross-layer design is becoming a popular design methodology for the next-generation mobile systems. In this paper, we try to exploit a cross-layer adaptive transmission algorithm for downlink OFDM system. This algorithm takes into consideration not only the channel state information and power limitation in the physical layer, but also traffic scheduling and(More)
In this paper, we focus on downlink zero forcing (ZF) beamforming design scheme for multiuser (MU) spatial multiplexing (SM) multiple-input multiple-output (MIMO) systems. Based on the minimum average probability of symbol error (PSE), we give the optimal design method of the beamforming weight matrices. Furthermore, we derive the upper bound PSEs to(More)
The combination of adaptive space-time coding at physical layer and truncated automatic repeat request at data link layer is considered in this paper. Three types of space-time code are analysed in the paper: V-BLAST, QOSTBC, and STBC. Furthermore, we deduce the approximate expression of packet error rate based on space-time code and propose a novel(More)
A pulsed-power generator using inductive adder technology is proposed for the case of a discharge gap. The merit of this generator is to merge the pulsed-voltage and pulsed-current adders via the dual secondary windings with special circuit. For the nonlinear impedance in any discharge gap, the standalone voltage-pulse and current-pulse can be outputted(More)
In a high-powered single pulse system, the graphite electrode is better than other common metal electrodes for high energy transfer and pulse discharge. In this paper, the erosion mechanism of graphite electrode is investigated with the thermodynamics theory and the experimental results. Based on a simplified mathematical model, the graphite electrode(More)