基于SCMA的蜂窩系統(tǒng)下行鏈路無(wú)線(xiàn)資源管理研究
[Abstract]:5G network poses a great challenge to the next generation communication technology, especially the multiple access technology, in the aspects of user connection, system capacity, delay, stability and quality of service. Non-orthogonal multiple access (non-orthogonal multiple access, NMA) technology is popular in the industry because of its technical characteristics, which can carry more user data on traditional time-frequency resources. The sparse code division multiple access (Sparse Code Multiple Access, SCMA) technology proposed by Huawei is one of them. SCMA can realize different system overload by using sparse codebook. Moreover, SCMA can flexibly configure parameters according to the actual situation to generate different codebook resources, which makes it possible to realize mass links in the system. In addition, SCMA uplink can adopt Grant-Free access mechanism based on competitive mechanism. As a result, the system delay and signaling overhead are greatly reduced, so it has great potential in meeting 5G communication requirements. In view of the importance of wireless resource management (Radio Resource Management, RRM) in various wireless communication networks and the high degree of compatibility between SCMA technology and 5G communication requirements, The study of RRM in wireless communication system based on SCMA will have important theoretical and practical significance. This paper mainly focuses on the research of RRM in the downlink of wireless cellular system based on SCMA. Because of the introduction of SCMA, the basic unit of wireless resources in the system will be defined by several dimensions such as time domain, frequency domain, SCMA code domain and so on, and the SCMA codebook is closely related to time-frequency domain. In view of the correlation relationship and the frequency-selective fading characteristics of the wireless channel, different system performance will be obtained when the current row user uses different SCMA codebooks or allocates the same codebook to different downlink users. However, the current research on SCMA is random selection for users. Therefore, in the SCMA wireless downlink model, a SCMA codebook selection scheme based on channel state information (Channel State Information, CSI) will be adopted. To maximize system capacity. In addition, since power control is also an important part of RRM, and there is no effective power control scheme in the current SCMA research, this paper also studies the SCMA downlink power allocation scheme. Based on the results of codebook selection based on CSI, the classical water injection power allocation algorithm is used to optimize the capacity of SCMA system. At the same time, in order to synchronize with SCMA system, this paper also simulates the capacity of OFDMA downlink system with the same system resource allocation and similar resource allocation algorithm. The simulation results show that the SCMA codebook selection strategy and power allocation algorithm based on CSI are better than those under random codebook selection and power sharing schemes, and the performance of the system is better because of the overload characteristics of SCMA. Compared with OFDMA system, it can also achieve better system capacity performance. Finally, the other three scenarios of SCMA downlink (SU-SCMA, single user multiple SCMA layer / codebook transmission and user QoS guarantee requirements) are also discussed. The selection strategy of SCMA codebook and the applicability of power allocation algorithm based on CSI are analyzed in detail. The analysis shows that the downlink RRM algorithm based on SCMA has good applicability and is an effective RRM method to improve the performance of SCMA system.
【學(xué)位授予單位】:西南交通大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2016
【分類(lèi)號(hào)】:TN929.53
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