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-According to the requirement of the Physics Data Challenge and many years of experiences from the actual operations, we propose the Grid Architecture for the ALICE Experiment. This architecture builds on AliEn2 framework and AliEn2 is the grid framework for the whole system's management and also provides the client interface for accessing the ALICE Grid platform. On the base of AliEn2, we adopt some middlewares to make the platform more flexible, availability and efficiency. At the end, the whole system has been worldwide deployed at around 88 sites for distributed production of raw data and Monte Carlo data, detector simulation, reconstruction and real data analysis. We observe the activities of the platform from different point of view and report the performance of the whole ALICE grid platform. The whole Grid Architecture for ALICE experiment plays an important role in High Energy Physics. It successfully manages the resources distributed all over the world and has a great efficiency system to make all peoples from and in different countries working together. The experiments show the whole system works fine and efficient.

Abstract:Next generation communication systems aim mainly to data throughput improvement for any wireless channel conditions. According to Shannon formula, UWB system with gigahertz band can reach ultra-high data transmission rate. Multiband orthogonal frequency division multiplexing (MB-OFDM) for ultra wideband (UWB) technology presents a potential candidate for the diverse set of high-rate performance short-range applications. When combined with a multiple-input multiple-output (MIMO) and a space time code (STC) transmission scheme, MB-OFDM UWB presents a viable way to improve channel capacity and expand coverage area. This paper presents an analysis on the capacity and performance of MIMO STC-MB-OFDM systems over UWB channels. Also, this work will compare the Alamouti code and the algebraic space-time-code (ASTC) capacity when used in MIMO MB-OFDM system. It will be shown that ASTC code can provide significantly higher channel capacity and better BER performance when used in a MIMO MB-OFDM system.

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