【摘要】：隨著移動通信的發(fā)展,3G已經(jīng)逐漸走入我們的生活。其中,3G技術(shù)之一的TD-SCDMA是我國自主研發(fā)。本文主要研究的是TD-SCDMA系統(tǒng)中的關(guān)鍵技術(shù):功率控制。作為碼分多址(CDMA)系統(tǒng),“遠(yuǎn)近效應(yīng)”和“多址干擾”一直是CDMA系統(tǒng)難以解決的問題。功率控制正是克服此問題的辦法,精準(zhǔn)的功率控制可以保證通信有效性的同時(shí),提高系統(tǒng)容量。 本文首先介紹了TD-SCDMA系統(tǒng)中功率控制技術(shù)的準(zhǔn)則和機(jī)制。針對現(xiàn)有的上行鏈路固定步長功率控制算法在深度快衰落時(shí)跟不上信道變化的問題,本文提出了一種改進(jìn)的功率控制算法。新算法基于信干比測量,對其進(jìn)行預(yù)測,這樣可以反映不同的信道變化,最后以較準(zhǔn)確的值與外環(huán)提供的目標(biāo)信干比進(jìn)行比較,產(chǎn)生功率控制命令,然后由Markov狀態(tài)對應(yīng)不同的功率控制步長,選擇合適的步長進(jìn)行功率調(diào)整。與傳統(tǒng)功率控制算法相比,改進(jìn)算法更好的跟蹤了信道變化,并且針對于固定步長的功率控制算法,改進(jìn)算法對步長有了更多的選擇,對功率控制效果起到提高的作用,最后,本文使用MATLAB軟件進(jìn)行仿真,在仿真中建立TD-SCDMA系統(tǒng)的物理層鏈路模型以及數(shù)據(jù)的發(fā)射傳送、接收模型。仿真結(jié)果包括:改進(jìn)算法與固定步長算法的性能對比和改進(jìn)算法對系統(tǒng)性能改進(jìn)的分析。仿真結(jié)果表明改進(jìn)算法強(qiáng)于傳統(tǒng)的固定步長算法,有效的控制了發(fā)射功率,增加了系統(tǒng)的穩(wěn)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.
【學(xué)位授予單位】：哈爾濱理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TN929.533

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本文編號：2456899