本文關(guān)鍵詞： LTE 隨機(jī)接入 關(guān)鍵技術(shù) 前導(dǎo)檢測 門限算法　出處：《哈爾濱理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨機(jī)接入過程作為通信過程中用戶請求接入網(wǎng)絡(luò)的第一步，是LTE通信網(wǎng)絡(luò)的重要組成部分。目前廣泛應(yīng)用于LTE系統(tǒng)的隨機(jī)接入前導(dǎo)檢測算法是一種時域檢測算法，，傳統(tǒng)的時域檢測算法主要有動態(tài)門限檢測算法和固定門限檢測算法。在隨機(jī)接入前導(dǎo)檢測中傳統(tǒng)動態(tài)門限檢測算法要根據(jù)信噪比動態(tài)調(diào)整閾值，這樣會使得計算復(fù)雜度比較大，給網(wǎng)絡(luò)造成巨大的時延和負(fù)擔(dān)。而采用傳統(tǒng)固定門限檢測算法雖然計算效率高，但其檢測性能還有待提高。 在此背景下，本論文主要針對LTE的FDD模式下隨機(jī)接入過程的關(guān)鍵技術(shù)即前導(dǎo)檢測技術(shù)進(jìn)行了深入研究，分析了如何對前導(dǎo)序列進(jìn)行接收和檢測，為了滿足計算效率的同時達(dá)到提高檢測性能的目的，對傳統(tǒng)的固定門限檢測的方法進(jìn)行了改進(jìn)。給出了隨機(jī)接入接收端在FPGA上的實現(xiàn)方案和具體的模塊設(shè)計。設(shè)計并建立了基于Matlab的隨機(jī)接入前導(dǎo)檢測的仿真平臺，通過圖形化的界面可以設(shè)置各種仿真參數(shù)。在此基礎(chǔ)上按照LTE-FDD標(biāo)準(zhǔn)的測試要求，在高速和低速兩種不同的速度場景下，分別采用不同的信道條件和配置參數(shù)對改進(jìn)后的算法性能進(jìn)行了仿真，結(jié)果表明采用改進(jìn)后算法的前導(dǎo)序列檢測性能完全達(dá)到了LTE規(guī)定的標(biāo)準(zhǔn)。最后對比了高速模式下采用傳統(tǒng)的固定門限檢測算法和改進(jìn)后的門限檢測算法的性能仿真結(jié)果，表明了改進(jìn)后的算法能夠有效的提高隨機(jī)接入信號的檢測性能。
[Abstract]:Random access process, as the first step of user request access network, is an important part of LTE communication network. At present, random access preamble detection algorithm, which is widely used in LTE system, is a time-domain detection algorithm. The traditional time domain detection algorithms mainly include dynamic threshold detection algorithm and fixed threshold detection algorithm. The traditional fixed threshold detection algorithm has high computational efficiency, but its detection performance still needs to be improved. Under this background, this paper mainly focuses on the key technology of random access process in FDD mode of LTE, which is the leading detection technology, and analyzes how to receive and detect the leading sequence. In order to satisfy the calculation efficiency and improve the detection performance, The traditional method of fixed threshold detection is improved. The implementation scheme of random access receiver on FPGA and the specific module design are given. The simulation platform of random access preamble detection based on Matlab is designed and established. All kinds of simulation parameters can be set by graphical interface. On this basis, according to the test requirements of LTE-FDD standard, under two different speed scenarios of high speed and low speed, The performance of the improved algorithm is simulated with different channel conditions and configuration parameters. The results show that the performance of the improved algorithm is up to the standard specified by LTE. Finally, the performance simulation results of the traditional fixed threshold detection algorithm and the improved threshold detection algorithm in high speed mode are compared. It shows that the improved algorithm can effectively improve the detection performance of random access signals.
【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】：2014
【分類號】：TN929.5

【引證文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 宋輝;LTE隨機(jī)接入前導(dǎo)信號的檢測算法研究[D];北京郵電大學(xué);2015年

本文編號：1534470