The Resarch On Distrubuted Space-Time Codes

In order to meet the needs of high-rate and multi-service communication, the next generationwireless communication systems must be able to provide better mechanisms and techniques, notonly to increase the transfer rate, but also to meet the various QoS requirements.Multiple-input-multiple-output (MIMO) technology can improve system capacity, as the result ofmobile terminal's size, it's unrealistic to configure multi-antenna on it, which leads to the limiteduse of MIMO technology. However, cooperative communication system combined MIMOtechnology through the relay nodes created a virtual antenna array could achieve spatial diversityand time diversity.As the sub-topics of National Natural Science Foundation (Project No.:61071089), this thesismajor research on the problem of power distribution between the source node and relay nodes incooperative communication system. The thesis first described the MIMO technical and cooperativecommunication system, simply analyzed the development of these technologies at the present stage;then this thesis described MIMO technology and cooperative communication system's models,basic realization of the principle, implementation process and the cooperative approach to beclassifi ed; Second, analyzed MIMO communication system according to pair-wise error rate,described the design criteria for space-time code, analyzed several typical space-time codes anddecode, then compared these typical space-time codes method by simulation; After that, accordingto the cooperative communication system's model derived the guidelines of distributed space-timecode, then analyzed several typical distributed space-time codes, compared and analyzed thesetypes of distributive space-time codes and its space-time codes by simulation; Finally, the thesisaccording to the design of distributed space-time code criteria derived the optimal solution powerdistribution between source node and relay nodes, then simulated and compared the distribution ofoptimal power allocation scheme between average power allocation scheme based on a few typicaldistributed space-time codes, the simulations shows that the optimal power allocation scheme cansignificantly improved the cooperative communication system's average bit error rate (BER).