【摘要】：隨著人們對多媒體業(yè)務(wù)和數(shù)據(jù)通信的需求越來越大,近十幾年間無線移動通信有了迅猛的發(fā)展。以第四代移動通信為主的通信方式在全球已經(jīng)得到了廣泛的普及,4G技術(shù)相比上一代通信技術(shù),提供了更高的帶寬以及更低的時延。在無線信道環(huán)境下的高速數(shù)據(jù)通信,所受到的來自信道的干擾和衰落對數(shù)據(jù)的影響更加顯著。因此,信道估計與信道均衡作為消除信道衰弱以及信號符號間干擾和子載波間干擾的重要方法,受到了研究人員越來越多的重視。 本文在分析了傳統(tǒng)的信道估計及均衡算法的研究之后,提出了一個基于TD-LTE基帶硬件平臺的信道估計與均衡的設(shè)計并完成了面向SOC的硬件實現(xiàn)。由于SOC設(shè)計的限制,需要對算法的可實現(xiàn)性以及復(fù)雜度有很高要求,而傳統(tǒng)的最小均方誤差信道估計算法在實現(xiàn)上太過復(fù)雜,因此本設(shè)計的目標(biāo)是易于實現(xiàn)且也能滿足系統(tǒng)在TD-LTE下的性能需求。 本文提出的信道估計算法分為粗信道估計、時偏及頻偏估計和精信道估計三部分,在粗信道估計之后計算導(dǎo)頻的時間偏移與頻率偏移,在精信道估計中通過對時間偏移進(jìn)行補償來消除其引起的相位旋轉(zhuǎn),然后在頻域上對導(dǎo)頻進(jìn)行濾波平均,最后補償頻率偏移并對兩個時隙的估計結(jié)果進(jìn)行平均,使得估計結(jié)果更加準(zhǔn)確。本文首先簡要介紹了信道估計與均衡的算法研究以及SOC設(shè)計的設(shè)計流程及準(zhǔn)則,然后重點介紹了本文使用的TD-LTE系統(tǒng)的基帶平臺的架構(gòu)及功能,以及信道估計與均衡模塊在基帶平臺中的硬件設(shè)計過程和硬件實現(xiàn)過程,最后通過硬件仿真和Matlab仿真進(jìn)行了對比驗證,證明設(shè)計的模塊滿足TD-LTE系統(tǒng)的性能需求。
[Abstract]:With the increasing demand for multimedia services and data communication, wireless mobile communication has developed rapidly in recent years. The fourth generation mobile communication mode has been widely used in the world. Compared with the previous generation, 4G technology provides higher bandwidth and lower delay. In high speed data communication in wireless channel, the interference and fading from the channel have a more significant effect on the data. Therefore, channel estimation and channel equalization, as an important method to eliminate channel weakness and inter-symbol interference and inter-carrier interference, have been paid more and more attention by researchers. After analyzing the traditional channel estimation and equalization algorithms, this paper proposes a design of channel estimation and equalization based on TD-LTE baseband hardware platform, and completes the hardware implementation for SOC. Due to the limitation of SOC design, the realizability and complexity of the algorithm are very high, but the traditional minimum mean square error channel estimation algorithm is too complex. Therefore, the goal of this design is easy to implement and can also meet the performance requirements of the system under TD-LTE. The proposed channel estimation algorithm is divided into three parts: coarse channel estimation, time offset and frequency offset estimation and refined channel estimation. After coarse channel estimation, the time offset and frequency offset of pilot are calculated. In the fine channel estimation, the phase rotation caused by the time offset is eliminated by compensating the time offset, then the pilot frequency is filtered average in the frequency domain, finally the frequency offset is compensated and the estimation results of the two time slots are averaged. It makes the estimation more accurate. This paper firstly introduces the algorithms of channel estimation and equalization, and the design flow and criterion of SOC design, then introduces the architecture and function of the baseband platform of the TD-LTE system used in this paper. The hardware design process and hardware implementation process of channel estimation and equalization module in baseband platform are also discussed. Finally, the hardware simulation and Matlab simulation are compared to verify that the designed module meets the performance requirements of TD-LTE system.
【學(xué)位授予單位】：北京郵電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN929.5;TN47

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