基于SIR的TD-SCDMA功率控制算法研究与仿真
发布时间：2019-04-12 09:22
【摘要】：随着移动通信的发展,3G已经逐渐走入我们的生活。其中,3G技术之一的TD-SCDMA是我国自主研发。本文主要研究的是TD-SCDMA系统中的关键技术:功率控制。作为码分多址(CDMA)系统,“远近效应”和“多址干扰”一直是CDMA系统难以解决的问题。功率控制正是克服此问题的办法,精准的功率控制可以保证通信有效性的同时,提高系统容量。 本文首先介绍了TD-SCDMA系统中功率控制技术的准则和机制。针对现有的上行链路固定步长功率控制算法在深度快衰落时跟不上信道变化的问题,本文提出了一种改进的功率控制算法。新算法基于信干比测量,对其进行预测,这样可以反映不同的信道变化,最后以较准确的值与外环提供的目标信干比进行比较,产生功率控制命令,然后由Markov状态对应不同的功率控制步长,选择合适的步长进行功率调整。与传统功率控制算法相比,改进算法更好的跟踪了信道变化,并且针对于固定步长的功率控制算法,改进算法对步长有了更多的选择,对功率控制效果起到提高的作用,最后,本文使用MATLAB软件进行仿真,在仿真中建立TD-SCDMA系统的物理层链路模型以及数据的发射传送、接收模型。仿真结果包括:改进算法与固定步长算法的性能对比和改进算法对系统性能改进的分析。仿真结果表明改进算法强于传统的固定步长算法,有效的控制了发射功率,增加了系统的稳定性,使性能得到提高。
[Abstract]:With the development of mobile communication, 3G has gradually entered our life. Among them, TD-SCDMA, one of the 3G technologies, is the independent research and development of our country. This paper mainly studies the key technology of TD-SCDMA system: power control. As code division multiple access (CDMA) systems, "near-far effect" and "multiple access interference" have always been difficult to solve in CDMA systems. Power control is the way to overcome this problem. Accurate power control can ensure the communication efficiency and improve the system capacity. This paper first introduces the criterion and mechanism of power control technology in TD-SCDMA system. In this paper, an improved power control algorithm is proposed to solve the problem that the existing uplink fixed step-size power control algorithms can not keep up with the channel changes when the depth of fast fading occurs. Based on the signal-to-interference ratio measurement, the new algorithm can predict the signal-to-interference ratio, so that it can reflect different channel changes. Finally, compared with the target signal-to-interference ratio provided by the outer loop, a power control command can be generated by comparing the accurate value with the target signal-to-interference ratio. Then the Markov state corresponds to the different power control step, and the appropriate step size is selected to adjust the power. Compared with the traditional power control algorithm, the improved algorithm tracks the channel changes better, and for the fixed step-size power control algorithm, the improved algorithm has more choices for the step size, and plays an important role in improving the power control effect. In this paper, MATLAB software is used to simulate the physical layer link model of TD-SCDMA system and the transmitting and receiving model of data. The simulation results include: the performance comparison between the improved algorithm and the fixed step algorithm and the analysis of the system performance improvement by the improved algorithm. The simulation results show that the improved algorithm is better than the traditional fixed step-size algorithm, which effectively controls the transmission power, increases the stability of the system and improves the performance.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TN929.533
本文编号：2456899
[Abstract]:With the development of mobile communication, 3G has gradually entered our life. Among them, TD-SCDMA, one of the 3G technologies, is the independent research and development of our country. This paper mainly studies the key technology of TD-SCDMA system: power control. As code division multiple access (CDMA) systems, "near-far effect" and "multiple access interference" have always been difficult to solve in CDMA systems. Power control is the way to overcome this problem. Accurate power control can ensure the communication efficiency and improve the system capacity. This paper first introduces the criterion and mechanism of power control technology in TD-SCDMA system. In this paper, an improved power control algorithm is proposed to solve the problem that the existing uplink fixed step-size power control algorithms can not keep up with the channel changes when the depth of fast fading occurs. Based on the signal-to-interference ratio measurement, the new algorithm can predict the signal-to-interference ratio, so that it can reflect different channel changes. Finally, compared with the target signal-to-interference ratio provided by the outer loop, a power control command can be generated by comparing the accurate value with the target signal-to-interference ratio. Then the Markov state corresponds to the different power control step, and the appropriate step size is selected to adjust the power. Compared with the traditional power control algorithm, the improved algorithm tracks the channel changes better, and for the fixed step-size power control algorithm, the improved algorithm has more choices for the step size, and plays an important role in improving the power control effect. In this paper, MATLAB software is used to simulate the physical layer link model of TD-SCDMA system and the transmitting and receiving model of data. The simulation results include: the performance comparison between the improved algorithm and the fixed step algorithm and the analysis of the system performance improvement by the improved algorithm. The simulation results show that the improved algorithm is better than the traditional fixed step-size algorithm, which effectively controls the transmission power, increases the stability of the system and improves the performance.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TN929.533
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