TD-LTE-A系統(tǒng)下行鏈路資源分配算法研究
[Abstract]:With the advent of the data age and the complexity of Internet business requirements, people put forward higher requirements for the service rate and other performance of wireless communication systems, which promotes the development of wireless communication systems from generation to generation. The LTE system and the subsequent LTE-A system put forward by 3GPP organization have been widely studied, and their research results have been gradually promoted to marketization and industrialization. In 2004, China put forward the TD-LTE standard using OFDMA technology to 3GPP organizations. On this basis, the 4G standard: TD-LTE-A. is improved. Although the physical layer technology has been relatively mature development, the bandwidth of wireless system and the limited base station transmission power resources are still very scarce, only rely on the improvement of physical layer technology, it is difficult to meet the higher and higher wireless communication performance requirements. Therefore, the efficient management and allocation of wireless resources has become a hot research topic. The optimal allocation of downlink resources in TD-LTE-A system based on OFDMA technology will become an important means to improve the performance of wireless networks. The main content of this paper is the power allocation algorithm in TD-LTE-A downlink resource allocation, which is used to adapt to the diversified service environment of TD-LTE-A system and improve the satisfaction of users in the system. In this paper, the research background, purpose and significance of this subject are briefly described. Secondly, the channel gain model of TD-LTE-A system and the OFDM technology used are studied and analyzed. Thirdly, the idea of cross-layer optimization is studied, and the application of cross-layer optimization design in TD-LTE-A system resource allocation is introduced. Fourth, the resource allocation scheduling process, performance evaluation standard and resource block allocation method of TD-LTE-A downlink are studied. Fifth, the downlink power allocation algorithm of TD-LTE-A system is studied emphatically. by analyzing the traditional water injection algorithm and the principle of simple cooperative power allocation algorithm, the shortcomings of the two methods are summarized. The genetic algorithm of joint optimization design is proposed as the solution of power allocation problem in this paper. Finally, the simple cooperative power allocation algorithm and genetic algorithm are simulated in combination with the actual scene. In this paper, the simple cooperative power allocation algorithm and genetic algorithm are analyzed in detail through theoretical and simulation results, and the two algorithms are obtained to guarantee the QoS user service and the BE user service performance. The performance results of three main aspects of the service performance of all users of the system. By comparing the performance of the two algorithms, it is concluded that the performance of genetic algorithm is better than that of simple cooperative power allocation algorithm with the increase of the number of QoS users in the system.
【學(xué)位授予單位】:哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類號(hào)】:TN929.5
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