基于SRS的LTE上行定時同步算法研究
[Abstract]:In 2004, 3GPP proposed the long-term evolution of 3G (Long Term Evolution, (LTE) program to meet the requirements of mobile communication service rate and quality of service, to maintain the competitiveness of 3G. LTE can effectively improve the data transmission rate. Reduce system delay, increase system capacity and coverage, improve quality of service. Therefore, LTE technology will become the technical standard and development direction of communication for a long time in the future, which is of great significance to the research of LTE. In this paper, the timing synchronization of LTE uplink based on probe reference signal (SRS) is studied in FDD mode. First of all, this paper introduces the historical background of LTE technology and its development status at home and abroad, performance requirements and system architecture, and describes the related concepts of the physical layer of LTE technology, including transmission technology, data frame structure, time-frequency resource lattice. Physical channels and reference signals. The generation and mapping mode of SRS and the transmission period and position are introduced in detail. Secondly, after analyzing the influence of timing error on received signal and the process of uplink synchronization by LTE, this paper discusses the characteristics of SRS signal in the transmission process, and then focuses on the synchronization algorithm of reference sequence based on this characteristic. Including the classical SC algorithm, as well as the improved Minn algorithm, Adegbenga B and Zhang algorithm. In the AWGN channel, the performance of these algorithms is simulated, the timing metric curves of various algorithms are observed, and their advantages and disadvantages are compared. The results show that the timing performance of SC algorithm and Zhang algorithm is poor due to the existence of the platform, and the timing performance of Minn algorithm and Adegbenga B algorithm is better, but at the cost of high computational complexity. Finally, this paper introduces the simulation channel model of LTE, and then gives two improved timing synchronization algorithms based on SRS signal. The first one is to improve the SC algorithm from the point of view of time domain, and the second is to extract the timing information from the frequency domain. The two improved algorithms are simulated in AWGN channel and multipath EVA channel under single-user and two-user communication conditions, and their performance under various communication conditions are observed. By comparing the two improved algorithms, it is found that the improved SC algorithm has better timing performance in AWGN channel and multipath EVA channel, and can effectively resist noise and frequency offset. The improved algorithm in frequency domain not only improves the timing performance but also reduces the computational complexity.
【學(xué)位授予單位】:西安電子科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:TN929.5
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