Distributed Mimo System In The Transport Mechanism And Methods

One form of distributed MIMO implementation, virtual MIMO (VMIMO), uses mobile terminal antenna to form a virtual antenna array (VAA), and can meet the independence requirements among MIMO subchannels. However, such distributed MIMO relies on the independence terminals working together closely,that is,cooperative; At the same time, relay communication based on virtual antenna array need to be researched adequately. But, the existing literatures just focus on conventional MIMO models and theoretical analysis, it cann't construct common model of MIMO and give the practical mechanism or methods.Therefor, this disseration mainly studies transmison mechanism and methods of distributed MIMO system, and gives multi-terminal cooperative relay selection scheme and channel matrix forming methods. Besides, distributed MIMO system is sensitive to the order of antenna, so this dissertation uses network coding to solve the problem. Main contents of this paper are listed as follows:1 This dissertation studies the cooperative communication of distributed MIMO as well as relay transmision mechanisms and methods, gives a relay terminal selecting scheme with two-hop multi-terminal cooperative relay selection scheme in VMIMO system and information transmission MAC control mechanisms. The scheme contains two basic processes: 1) selection of relay nodes (RN) in two-hop relay transmission.2) mothod of multi-relay cooperative communication in two-hop relay transmission.2 This dissertation presents a distributed MIMO system channel matrix forming method, and gives a specific mechanism for implementation.This method mainly use cross-layer cooperative and information-sharing idea.Terminals submit the channel information measurement of physical layer to MAC layer , and share the channel information in local group through broadcasting or unicasting.Because of random distribution,the disorder channel information vector cause the channel matrix different in each terminals.So, the sequence of channel matrix vector is based on ID number.The condition that terminals enter or quit communication group is often existent in distributed MIMO system. Therefore, the main terminals need to monitor the local terminals real-time, and to make corresponding countermeasures.3 For the distributed MIMO system is sensitive to the order of antenna, this dissertation uses network coding to solve the problem. Using network coding, the information is distributed in network by sharing method.Then, the relay nodes can receive information and send out the encoded information.Therefore, network coding improves the network throughput and robustness greatly. In case the existing network does a lot of modifications to the right hardware and software equipment, especially to the corresponding protocol, network coding can be implemented at high-layer.At the same time, in this dissertation, network coding techniques has been improved in order to improve the success rate of the transmission system, as well as greatly reduce transmission of information over wireless networks.On the whole, there are the following contributions in the dissertation:1 We study the cooperative relay mechanism of distributed MIMO system, and give relay nodes selection method and multi-relay cooperative communication.2 We propose channel matrix forming method of distributed MIMO system,and implement it in practice.3 We improve on network coding and make use of it at distributed MIMO system.All of the contributions have been accepted by State Intellectual Office of the People's Republic of China as form of patent.