毕业设计 CDMA移动通信功率控制设计.docVIP

毕业论文 设计（论文）题目： CDMA移动通信系统功率控制 的研究与仿真 CDMA移动通信系统功率控制的研究与仿真 摘 要 本文通过分析CDMA移动通信的关键技术之一：功率控制技术；设计了一个自适应变步长仿真控制模块，该模块是基于信噪比SIR（Signal Interference Ratio）IS-95移动通信系统链路上进行仿真，检验其对接收功率平稳性的影响，利用MATLAB仿真，得出结果并分析。 由于CDMA系统为一干扰受限系统，即干扰大小影响系统容量，“远近效应”和“多址干扰”将会导致系统容量的下降。所以如果每个移动台的信号到达基站时都达到最小所需的信干比，系统容量将会达到最大值，解决这些问题的一个有效方法是采用自动功率控制技术。TPC性能，有效减小MAI，消除远近效应，保证通信质量的通知最大化系统容量。 最后，通仿真结果表明：自适应变步长功率控制方案具有更好的控制效果，使得发射功率能够快速并准确的补偿信道的多径快衰落。 关键词：码分多址，功率控制，基于SIR测量，自适应变步长 ABSTRACT Through the analysis of one of the key technologies in CDMA mobile communication: Power Control; I design an adaptive step-size closed-loop power control algorithm in CDMA mobile system. Strictly speaking, this algorithm is a Step adaptive reverse link closed-loop open-loop power control which based on SIR（Signal Interference Ratio），and simulated on the IS-95 mobile system link, demonstrating the smooth of the received power. Using MATLAB simulation, and analyzing the results. The capacity of code division multiple access (CDMA) systems is limited by interference. Any method to decrease transmitting power and interference to other users will increase the system capacity and communication quality. At present, how to adopt appropriate power control technology to effectively reduce multiple access interference and improve the quality of communication and maximize the system capacity is one of the hot points the research of CDMA cellular systems. Adaptive step-sized power control algorithm overwhelmed the faults of the traditional fixed-step power control algorithm. The mobile station can precede the linear prediction for the received power control bit. The linear prediction can reduce the transformational errors for the power control bit and the negative impact of the transmission delay, compensating the channel fading, reducing the errors of the power control; besides, the SIR’ s waveform can be assured to be steady in the adaptive-sized power control algorithm. Thus, the algorithm can be used as an additional mob