TD-LTE中信道估计与均衡的SOC设计与实现
发布时间：2018-11-28 11:24
【摘要】：随着人们对多媒体业务和数据通信的需求越来越大,近十几年间无线移动通信有了迅猛的发展。以第四代移动通信为主的通信方式在全球已经得到了广泛的普及,4G技术相比上一代通信技术,提供了更高的带宽以及更低的时延。在无线信道环境下的高速数据通信,所受到的来自信道的干扰和衰落对数据的影响更加显著。因此,信道估计与信道均衡作为消除信道衰弱以及信号符号间干扰和子载波间干扰的重要方法,受到了研究人员越来越多的重视。 本文在分析了传统的信道估计及均衡算法的研究之后,提出了一个基于TD-LTE基带硬件平台的信道估计与均衡的设计并完成了面向SOC的硬件实现。由于SOC设计的限制,需要对算法的可实现性以及复杂度有很高要求,而传统的最小均方误差信道估计算法在实现上太过复杂,因此本设计的目标是易于实现且也能满足系统在TD-LTE下的性能需求。 本文提出的信道估计算法分为粗信道估计、时偏及频偏估计和精信道估计三部分,在粗信道估计之后计算导频的时间偏移与频率偏移,在精信道估计中通过对时间偏移进行补偿来消除其引起的相位旋转,然后在频域上对导频进行滤波平均,最后补偿频率偏移并对两个时隙的估计结果进行平均,使得估计结果更加准确。本文首先简要介绍了信道估计与均衡的算法研究以及SOC设计的设计流程及准则,然后重点介绍了本文使用的TD-LTE系统的基带平台的架构及功能,以及信道估计与均衡模块在基带平台中的硬件设计过程和硬件实现过程,最后通过硬件仿真和Matlab仿真进行了对比验证,证明设计的模块满足TD-LTE系统的性能需求。
[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.
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN929.5;TN47
本文编号：2362690
[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.
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN929.5;TN47
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