全双工中继中的功率分配研究

发布时间：2018-05-12 05:31

本文选题：全双工 + 功率分配　；参考：《西安电子科技大学》2014年硕士论文

【摘要】：近年来,随着通信技术不断发展,系统中的用户及人们对于通信服务质量的需求也不断提高。如何充分利用稀缺的资源扩大信道传输容量、提高频谱利用率以及改善服务质量,一直以来都是亟需解决的问题。中继技术在扩大覆盖范围,提高可靠性和有效性等方面表现出了极其强大的性能优势。通信节点的工作模式主要有全双工和半双工两种。半双工节点利用相互正交的资源处理信号,这将导致低的频谱效率。全双工节点可以在同一时隙或者相同频率内同时进行信号的接收和发送,这可以改善半双工模式的缺陷,但其自身机制会导致自干扰的产生。相关干扰处理技术的进步使得全双工技术的应用成为可能。全双工与中继技术相结合,可以充分发挥两者的优势,进一步提高系统性能,进而满足通信发展的需求。本文介绍了全双工技术在中继系统中的应用,主要研究了全双工单向和双向中继的功率分配问题,并分别对各种功率分配算法进行了性能分析和仿真验证。首先,在考虑直传链路的全双工无线单向中继系统中,分别针对于放大转发型和译码转发型中继,对不同条件下的功率分配算法进行了总结归纳,同时也求解了全双工和半双工系统的容量损益平衡点。功率分配算法主要分为等功率分配、单独约束分配和联合约束分配算法。与等功率分配算法相比,单独约束功率分配和联合约束功率分配算法均有更好的性能表现。其次,研究了全双工双向中继系统的功率分配问题。双向中继模型采用了模拟网络编码,剩余自干扰采用了更贴合实际的模型。除了引入matlab凸优化工具箱gpposy进行各节点的功率分配外,还针对于双向中继系统的具体应用环境,运用二分法的思想,提出了非对称和对称功率分配算法。与gpposy工具箱相比,两种次优功率分配方法虽损失一定的性能增益,但求解的复杂度降低,因此具有一定的实际意义。
[Abstract]:In recent years, with the continuous development of communication technology, users and people in the system of communication quality of service demand is also increasing. How to make full use of scarce resources to expand the channel transmission capacity, improve spectrum efficiency and improve the quality of service, has always been an urgent problem. Relay technology has a strong performance advantage in expanding coverage, improving reliability and effectiveness. There are two main working modes of communication nodes: full duplex and half duplex. Half-duplex nodes process signals using mutually orthogonal resources, which leads to low spectral efficiency. Full-duplex nodes can simultaneously receive and transmit signals in the same time slot or at the same frequency, which can improve the defect of half-duplex mode, but its own mechanism will lead to the generation of self-interference. The application of full duplex technology is possible with the development of correlation interference processing technology. The combination of full duplex and relay technology can give full play to the advantages of both and further improve the system performance to meet the needs of communication development. In this paper, the application of full duplex technology in relay system is introduced. The power allocation problem of full duplex unidirectional and bidirectional relay is mainly studied, and the performance analysis and simulation of various power allocation algorithms are carried out. First of all, in the full-duplex wireless one-way relay system considering direct link, the power allocation algorithms under different conditions are summarized respectively for amplifying hairstyle and decoding transponder. At the same time, the capacity gain and loss equilibrium of full duplex and half duplex systems is also solved. Power allocation algorithms are mainly divided into equal power allocation, single constraint allocation and joint constraint allocation algorithm. Compared with the equal-power allocation algorithm, the single constrained power allocation algorithm and the joint constrained power allocation algorithm have better performance. Secondly, the power allocation problem of full duplex bidirectional relay system is studied. The bidirectional relay model uses analog network coding, and the residual self-interference model is more practical. In addition to the introduction of matlab convex optimization toolbox gpposy for power allocation of each node, asymmetric and symmetric power allocation algorithms are proposed for the specific application environment of bidirectional relay system using the idea of dichotomy. Compared with the gpposy toolbox, the two sub-optimal power allocation methods lose a certain performance gain, but the complexity of the solution is reduced, so they have some practical significance.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5

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