无线通信接收端关键算法及FPGA实现研究
发布时间：2018-08-06 14:35
【摘要】：随着信息时代的到来，人们需要的信息量也越来越来，而随着DVB-S2标准的确立，更高的灵活性，更强的纠错性能，更大的传输容量的接收机拥有更好的市场空间。而在无线通信系统中，当码率一定的情况下，接收端设计的好坏关系到解码端解码性能。 本文主要工作包括如下几部分： （1）基带处理中的定时同步，载波恢复，DAGC（自动增益控制），均衡以及SNR（信噪比）估计都对直流分量敏感，因此在数字处理之前需要进行去直流分量的操作。本文结合系统的特征，通过对分块平均求值法和滑动平均求值法进行深入的分析，找出一种在资源和性能上平衡的新算法。 （2）数字信号是以帧为单位来进行发送，而解码端正确解码必须知道帧的起始位置，因此帧同步的实现是系统正常运行的首要条件。由于本系统有一部分辅助信号，在合理利用辅助信号的基础上，本文设计出既能在低信噪比（最低可到0dB）,又能在有频偏相偏条件下的帧同步方法。 （3）接收端将接收到的有用信号首先经过模拟AGC，将信号放大到一个合适的范围，再将信号输送给后面的基带处理。但是由于模拟AGC的性能所限，并不能满足解码端的需求，为了更精准的还原信号，，在利用已知信号的基础上，利用拉格朗日插值方法设计DAGC算法，为后面的解码模块提供更好的数据。 （4）SNR估计可以使系统解调性能得到有效提高。本文在充分利用辅助信息的基础上，根据辅助信息的特性，设计出较低复杂度和较高性能的SNR估计方法。 本文提出的上述方法，可以有效的提高无线传输系统的接收端解码性能。
[Abstract]:With the arrival of the information age, people need more and more information, and with the establishment of DVB-S2 standards, higher flexibility, stronger error-correcting performance, larger transmission capacity of the receiver has a better market space. In wireless communication system, when the bit rate is fixed, the design of the receiver is related to the decoding performance of the decoder. The main work of this paper is as follows: (1) timing synchronization, carrier recovery DAGC, equalization and SNR estimation are sensitive to DC components in baseband processing. Therefore, the operation of dedirect current component is needed before digital processing. According to the characteristics of the system, this paper analyzes the block average evaluation method and the moving average evaluation method, and finds out a new algorithm to balance the resource and performance. (2) the digital signal is transmitted in the unit of frame. The decoder must know the starting position of the frame correctly, so the realization of frame synchronization is the most important condition for the system to run normally. Because the system has a part of auxiliary signal, on the basis of reasonable utilization of auxiliary signal, In this paper, a frame synchronization method is designed, which can achieve low signal-to-noise ratio (0dB) and frequency offset. (3) the useful signal received by the receiver is first simulated to amplify the signal to a suitable range. The signal is then transmitted to the subsequent baseband processing. However, due to the performance limitation of analog AGC, it can not meet the needs of decoder. In order to restore the signal more accurately, the Lagrange interpolation method is used to design the DAGC algorithm based on the known signal. (4) SNR estimation can effectively improve the demodulation performance of the system. On the basis of making full use of auxiliary information and according to the characteristics of auxiliary information, a low complexity and high performance SNR estimation method is designed in this paper. The proposed method can effectively improve the receiver decoding performance of wireless transmission systems.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN92;TN791
[Abstract]:With the arrival of the information age, people need more and more information, and with the establishment of DVB-S2 standards, higher flexibility, stronger error-correcting performance, larger transmission capacity of the receiver has a better market space. In wireless communication system, when the bit rate is fixed, the design of the receiver is related to the decoding performance of the decoder. The main work of this paper is as follows: (1) timing synchronization, carrier recovery DAGC, equalization and SNR estimation are sensitive to DC components in baseband processing. Therefore, the operation of dedirect current component is needed before digital processing. According to the characteristics of the system, this paper analyzes the block average evaluation method and the moving average evaluation method, and finds out a new algorithm to balance the resource and performance. (2) the digital signal is transmitted in the unit of frame. The decoder must know the starting position of the frame correctly, so the realization of frame synchronization is the most important condition for the system to run normally. Because the system has a part of auxiliary signal, on the basis of reasonable utilization of auxiliary signal, In this paper, a frame synchronization method is designed, which can achieve low signal-to-noise ratio (0dB) and frequency offset. (3) the useful signal received by the receiver is first simulated to amplify the signal to a suitable range. The signal is then transmitted to the subsequent baseband processing. However, due to the performance limitation of analog AGC, it can not meet the needs of decoder. In order to restore the signal more accurately, the Lagrange interpolation method is used to design the DAGC algorithm based on the known signal. (4) SNR estimation can effectively improve the demodulation performance of the system. On the basis of making full use of auxiliary information and according to the characteristics of auxiliary information, a low complexity and high performance SNR estimation method is designed in this paper. The proposed method can effectively improve the receiver decoding performance of wireless transmission systems.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN92;TN791
【参考文献】
相关期刊论文 前10条
1 张玉;杨晓静;;集中插入式帧同步识别方法[J];兵工学报;2013年05期
2 白英芝;;单脉冲跟踪接收机的设计[J];电子设计工程;2011年10期
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4 孙德红;肖e
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