| Multi-antenna technology is one of the keys in communications technology development.And Multi-antenna technology of LTE communications system embraces space diversity,space multiplexing and beam forming.Thereof,space diversity and space multiplexing are able to control the multiple path impact in the process of communications,and to enhance the communications system performance at all dimensions.With providing diversity gain,space diversity is extensively introduced for signal stability enforcement;while,space multiplexing helps make good use of frequency band resource with offering multiplexing gain.Meanwhile,there exists a given optimal compromise between two different gains.In line with theoretical basis,OPNET18.0 software is utilized to build a simulation platform and to research open loop transmitter diversity and open loop spatial multiplexing technologies among 8 transmission modes in LET system.First of all,a research on the application of open loop spatial multiplexing technology in single housing estate scene and multi-housing estate scenes is conducted.The network performance is analyzed by channel utilization,delay and throughput,and the advantages of spatial multiplexing technology in improving system throughput/spectrum utilization are verified.Besides,The analysis of the parameters such as signal-to-noise ratio and packet loss rate is carried out to verify the advantages of spatial diversity technology in improving communication stability.Lastly,based on the technical features of spatial diversity and spatial multiplexing,the compromise issues between spatial diversity and spatial multiplexing is analyzed from the network aspect,and the performance and feasibility of spatial diversity and spatial multiplexing in multi-housing estate scenes are analyzed through a simulation analysis.The analysis results show that the compromise between spatial diversity and spatial multiplexing in network level can promote overall communication performance to a certain extent. |
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