期刊名称：International Journal of Computer Science Issues
印刷版ISSN：1694-0784
电子版ISSN：1694-0814
出版年度：2011
卷号：8
期号：4
出版社：IJCSI Press
摘要：In this paper, for the first time, virtual antennas are used in an underwater acoustic wireless sensor network and their effects on total system performance are studied. In multiple input single output (MISO) channels, spacial diversity is used to improve the system performance. In certain networks, especially in underwater networks, nodes are too small to have more than one antenna. Therefore, to achieve spacial diversity gain, cooperation between adjacent nodes can be a proper alternate method. For this purpose, each node of network tries to use its nearest adjacent node as a virtual antenna at some portions of time and with the aid of space time coding this new antenna profits from spacial diversity. It means that a cooperative virtual MISO scenario must be devised to determine the transmission and cooperation method in the network. Thus, the most frequently used cooperation schemes "decode and forward," and "amplify and forward," are applied, simulated and studied in an arbitrary underwater acoustic wireless sensor network and compared with the noncooperation mode. In this paper the alamouti space time coding, and the maximum ratio combiner are used to transmit, and combine data, respectively. Simulations show that virtual antenna in underwater wireless sensor networks can improve system performance up to 12.08%.
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