Transmission Performance In The Distributed Wireless Communication System

Along with the rapid development of wireless communication technology, the key point of wireless communication services transfers to the direction of multimedia communication, which needs wider frequency spectrum and higher transmission speed. To further improve the communication system transmission rate and reliability, MIMO technology and cooperative communication technology have been widespread concerned.Cooperative communication could make the mobile with one single antenna to share other mobile users'antennas, in multi-user enviroment, thus can generate many virtual antennas, like a kind of virtual MIMO system. So, it can get the corresponding diversity and multiplexing gain, and improve mobile communication system pereformance.In this paper, we consider a distributed cooperation communication system, in which the source node and relay cooperate with each other, sending signal to destination node. Decode-and-forward protocol is adopted; the paper applied the method of analysis based on system capacity and outage rate. Established the system model, and gave the general assumption about model, defined the multiplexing gain. This paper studied the single relay network environment cooperation plan, and the system transmission performance.Based on the detailed research on the literature [8], this paper analysised the system performance based on the channel model and power restricted condition, and verify it by dada simulation. Based on the literature, we analyses the characteristics of the actual transmission environment, put forward a new channel model, and a new power restricted condition, which make it more in line with the actual transmission environment.In the fourth chapter, we re-established the channel model, that is, the source-relay link modeling for Rician fading channel, and source+relay-link to target still Rayleigh fading channel, thus formed a kind of Rician-Rayleigh hybrid channel. In addition, we the researched the new power constraints. Finally, according to the data simulation curve, we analysised system transmission performance under the improving channel model and the power restricted condition.