Research On Key Technologies Of Space Time Coding And Spatial Mulitplexing Combined System

With the fast development of the high rate transmit operation such as multi-media and wide band internet, the need of high rate wireless access is increased. In wireless communication environment, high rate communications must cope with critical performance-limiting challenges that include limited availability of radio frequency spectrum and a complex time-varying wireless environment (fading and multi-path). It is difficult to resolve these questions using traditional way. With the increasing demand for higher data rates, better quality of service, fewer dropped calls, higher network capacity, and user coverage, calls for innovative techniques that improve spectral efficiency and link reliability. The use of multiple antennas at the receiver and transmitter in a wireless system, popularly known as MIMO (Multiple-Input Multiple-Output) technique is one of these measures. A growing acknowledgment of the performance gains from MIMO technology has spurred the insertion of this technology into wireless standards.Aim to improve the performance gain of wireless communication system, decrease the detection cost, and eliminate the co-channel inference in multi-user combined system, The content of research is as follows:1) Complete transmit diversity is gained for the wireless communication system gain by using Space Time Orthogonal Block Code technology, on the other hand, the transmit rate can be improved using spatial multiplexing, while the system bandwidth is not increased. Both diversity and multiplexing can be gained if combined the space time orthogonal block code and spatial multiplexing in space. Aim at the Space Time Orthogonal Block Code and Spatial Multiplexing combined system, using the matrix theory, the equation that can convert the Space Time Orthogonal Block Code and Spatial Multiplexing combined system into spatial multiplexing system is derived here. , and in addition the equivalent linear and non-linear force zero detection algorithms are purposed. Simulation results show the performance gain of the Space Time Orthogonal Block Code and Spatial...