期刊名称：International Journal of Computer Science & Technology
印刷版ISSN：2229-4333
电子版ISSN：0976-8491
出版年度：2012
卷号：3
期号：1Ver4
出版社：Ayushmaan Technologies
摘要：Wireless networks have quickly become part of everyday life. However, wireless devices are range and data rate limited. To overcome these limitations one method is to use Multiple-Input Multiple Output (MIMO) links. The multiple antenna allow MIMO systems to perform precoding (multi-layer beamforming) ,diversity coding(space-time coding),and spatial multiplexing. In the novel Space-Time Shift Keying (STSK) modulation scheme for MIMO communication systems, the concept of spatial modulation is extended to include both the space and time dimensions, in order to provide a general shift-keying framework .More specifically, in the proposed STSK scheme one out of Q dispersion matrices is activated during each transmitted block, which enables us to strike a flexible diversity and multiplexing tradeoff. This is achieved by optimizing both the space-time block duration as well as the number of the dispersion matrices in addition to the number of transmit and receive antennas. The concept of Generalized Space Time Shift Keying acts as united MIMO framework. The Spatial Multiplexing (SM)/Space Shift Keying (SSK) concept is extended into two dimension, mainly space as well as time. In this paper, power management solution for MIMO STSK system called antenna management is introduced. The key idea is to adaptively disable a subset of antennas and their RF chains to reduce circuit power consumption, when the capacity improvement of using a large number of antennas is small. Antenna management judiciously determines the number of active antennas to minimize energy per bit while satisfying the data rate requirement. Simulation results are provided to validate our analysis.
