Performance Analysis of the D-STTD Communication System with AMC Scheme

In this paper, we propose a Double-Space Time Transmit Diversity (D-STTD) communication system with Adaptive Modulation and Coding (AMC) scheme and analyze its performance using simulation experiments. The simulation results show that the probability of selecting a high Modulation and Coding Scheme (MCS) level increased as the Signal to Noise Ratio (SNR) improved. Furthermore, the D-STTD communication system with AMC scheme provided a more uniform throughput distribution throughout the entire SNR range compared to its counterpart which did not apply AMC scheme. Also, the maximum throughput of the D-STTD communication system with AMC scheme was twice that of a conventional AMC communication system or a Space Time Transmit Diversity (STTD) communication system with AMC scheme.

利用降压法分解天然气水合物试验研究

在世界的很多地区都发现了大范围的天然产出的气体水合物。由于水合物储存了大量的甲烷气体，所以被认为是未来的新能源。尽管人们已经清楚自然产出的天然气水合物存在于海洋和永久冻土带，但是对于如何从水合物储层中获取天然气的技术却知之甚少。本文讨论了在室内测试中水合物储层中气体的采收率。在本次研究当中，为分析水合物在多孔岩石里的分解现象而设计制造了实验设备。利用降压试验研究气体水合物的分解特性和分解气产量。通过试验，得出了水合物在不同条件下降压时的气体的产能，以及水合物随时间分解过程的比较结果。同时对分解气在多孔岩石内的流动规律和产量进行了研究。研究结果对提高水合物储层气体采收率将会有所帮助。