本文選題：TD-LTE + 主同步信號�。� 參考：《電子科技大學(xué)》2014年碩士論文

【摘要】：近30多年來無線移動通信技術(shù)飛速發(fā)展,各種新技術(shù)層出不窮,而正交頻分復(fù)用(OFDM)技術(shù)憑借其獨(dú)特的優(yōu)勢脫穎而出,成為了當(dāng)代通信系統(tǒng)的主流技術(shù)。OFDM系統(tǒng)的一個(gè)最大的缺點(diǎn)就是系統(tǒng)對同步誤差非常敏感,因此同步技術(shù)的研究變得非常重要。本文圍繞以O(shè)FDM技術(shù)為核心的TD-LTE系統(tǒng)下行時(shí)頻同步技術(shù)而展開,完成了下行主同步信號(PSS)同步的具體FPGA鏈路設(shè)計(jì)與實(shí)現(xiàn)。同時(shí),本文在傳統(tǒng)基于互相關(guān)的PSS檢測算法上提出了一種改進(jìn)的PSS相關(guān)檢測算法及其實(shí)現(xiàn)結(jié)構(gòu),該改進(jìn)算法能大幅降低實(shí)現(xiàn)復(fù)雜度,減少了所需的硬件資源。首先,本文簡要介紹了TD-LTE的物理層相關(guān)結(jié)構(gòu),著重介紹了下行同步信號,特別針對下行同步小區(qū)搜索算法進(jìn)行了研究,并對其中主同步信號檢測同步算法和粗頻偏估計(jì)算法進(jìn)行了重點(diǎn)分析與性能仿真。其次,本文以基于互相關(guān)的PSS檢測定時(shí)算法和基于PSS的頻偏估計(jì)算法為核心,根據(jù)3GPP規(guī)范,進(jìn)行了TD-LTE下行主同步信號同步的FPGA鏈路具體設(shè)計(jì)與實(shí)現(xiàn),完成了5ms系統(tǒng)半幀定時(shí),小區(qū)組內(nèi)ID識別,小數(shù)倍載波頻偏估計(jì),輔同步信號(SSS)提取等功能。并對其中ADC基帶接口,FIR低通濾波,截位與下采樣,匹配相關(guān)計(jì)算,定時(shí)脈沖生成,載波頻偏估計(jì),輔同步信號提取等幾個(gè)關(guān)鍵模塊進(jìn)行了詳細(xì)的仿真與測試,測試結(jié)果表明設(shè)計(jì)鏈路達(dá)到了預(yù)期功能。最后,本文在傳統(tǒng)基于互相關(guān)的PSS檢測算法上提出了一種改進(jìn)型低復(fù)雜度PSS相關(guān)檢測算法及其實(shí)現(xiàn)結(jié)構(gòu),該算法是傳統(tǒng)PSS互相關(guān)算法的數(shù)學(xué)近似,僅用一組實(shí)數(shù)匹配濾波處理就能完成復(fù)雜的PSS相關(guān)計(jì)算。由于引進(jìn)了噪聲項(xiàng),改進(jìn)算法在性能上相比傳統(tǒng)算法有所下降,但是能非常有效的降低實(shí)現(xiàn)復(fù)雜度和所需的硬件資源,在信噪比較高,信道環(huán)境較好的場景下有著不錯的適用性。
[Abstract]:In recent 30 years, with the rapid development of wireless mobile communication technology, a variety of new technologies emerge in endlessly. Orthogonal Frequency Division Multiplexing (OFDM) technology stands out because of its unique advantages. One of the biggest disadvantages of OFDM system, which has become the mainstream technology of modern communication system, is that the system is very sensitive to synchronization error, so the research of synchronization technology becomes very important. This paper focuses on the downlink time-frequency synchronization technology of TD-LTE system with OFDM technology as the core, and completes the FPGA link design and implementation of downlink main synchronous signal (PSS) synchronization. At the same time, this paper proposes an improved PSS correlation detection algorithm and its implementation structure based on the traditional cross-correlation-based PSS detection algorithm. The improved algorithm can greatly reduce the complexity of the implementation and reduce the required hardware resources. Firstly, the physical layer correlation structure of TD-LTE is briefly introduced, and the downlink synchronization signal is introduced, especially for the downlink synchronous cell search algorithm. The main synchronous signal detection synchronization algorithm and coarse frequency offset estimation algorithm are analyzed and simulated. Secondly, based on cross-correlation detection timing algorithm and frequency offset estimation algorithm, according to 3GPP specification, the design and implementation of 5ms downlink main synchronous signal synchronization link is carried out, and the half-frame timing of 5ms system is completed. In-cell ID identification, fractional double carrier frequency offset estimation, auxiliary synchronous signal (SSS) extraction and other functions. Several key modules, such as Fir low-pass filter, intercept and down-sampling, matching correlation calculation, timing pulse generation, carrier frequency offset estimation, auxiliary synchronous signal extraction and so on, are simulated and tested in detail, including ADC baseband interface Fir low-pass filtering, intercept and down-sampling, matching correlation calculation, timing pulse generation, carrier frequency offset estimation, auxiliary synchronous signal extraction and so on. The test results show that the designed link achieves the expected function. Finally, an improved low complexity PSS correlation detection algorithm and its implementation structure are proposed in this paper, which is a mathematical approximation of the traditional PSS cross-correlation algorithm. The complex PSS correlation calculation can be accomplished by only a set of real matched filter processing. Because of the introduction of noise terms, the performance of the improved algorithm is lower than that of the traditional algorithm, but it can reduce the complexity of implementation and the required hardware resources very effectively, and has a higher signal-to-noise ratio (SNR). The channel environment under the better scenario has a good applicability.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN929.5

【共引文獻(xiàn)】

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相關(guān)博士學(xué)位論文 前3條

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相關(guān)碩士學(xué)位論文 前10條

1 張海超;3GPP LTE系統(tǒng)中的動態(tài)干擾管理技術(shù)研究[D];西安電子科技大學(xué);2011年

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本文編號：2083634