基于FPGA的均衡与译码算法设计与实现
发布时间：2018-08-18 19:37
【摘要】：在军事通信领域,短波通信是一种非常重要的通信方式,但由于其通常采用电离层进行远距离的信号传输,不可避免地要受到电离层信道的时变色散性以及多径传播效应的影响,引起信号衰落和码间干扰,Turbo均衡是克服这些缺点的有效方法。在工程中,使用DSP+FPGA是较为常见的实现方法,其能有效地将DSP运算能力强以及FPGA并行工作的特点相结合。首先对基于MMSE准则的频域Turbo均衡以及软干扰抵消(SIC)的均衡进行了分析研究,然后讨论了LDPC码的基本原理、编译码算法,并给出了一种适合在FPGA平台上实现的改进的量化译码算法。最后,本文提出一种新的解决方案,该方案在FPGA上设计并实现了Turbo均衡系统中的uPP接口模块、傅里叶变换与反傅里叶变换模块、MMSE均衡与SIC均衡模块、软信息计算模块、均值与方差计算模块、交织与解交织模块和LDPC译码模块,并给出了各模块的仿真结果。
[Abstract]:In the field of military communication, shortwave communication is a very important communication mode, but because it usually uses the ionosphere for long-distance signal transmission, it will inevitably be affected by the ionospheric channel time-varying dispersion and multipath propagation effect, resulting in signal fading and intersymbol interference. Turbo equalization is to overcome these shortcomings. In engineering, using DSP + FPGA is a common implementation method, which can effectively combine the strong DSP computing power with the characteristics of parallel operation of FPGA. Firstly, the frequency domain Turbo equalization and soft interference cancellation (SIC) equalization based on MMSE criterion are analyzed and studied, then the basic principle of LDPC code, coding and decoding algorithms are discussed. Finally, a new solution is proposed. The UPP interface module, Fourier transform and inverse Fourier transform module, MMSE equalization and SIC equalization module, and soft information computing module in Turbo equalization system are designed and implemented on FPGA. Value and variance calculation module, interleaving and de-interleaving module and LDPC decoding module, and the simulation results of each module are given.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN911.22
本文编号：2190474
[Abstract]:In the field of military communication, shortwave communication is a very important communication mode, but because it usually uses the ionosphere for long-distance signal transmission, it will inevitably be affected by the ionospheric channel time-varying dispersion and multipath propagation effect, resulting in signal fading and intersymbol interference. Turbo equalization is to overcome these shortcomings. In engineering, using DSP + FPGA is a common implementation method, which can effectively combine the strong DSP computing power with the characteristics of parallel operation of FPGA. Firstly, the frequency domain Turbo equalization and soft interference cancellation (SIC) equalization based on MMSE criterion are analyzed and studied, then the basic principle of LDPC code, coding and decoding algorithms are discussed. Finally, a new solution is proposed. The UPP interface module, Fourier transform and inverse Fourier transform module, MMSE equalization and SIC equalization module, and soft information computing module in Turbo equalization system are designed and implemented on FPGA. Value and variance calculation module, interleaving and de-interleaving module and LDPC decoding module, and the simulation results of each module are given.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN911.22
【参考文献】
相关期刊论文 前1条
1 马卓;杜栓义;王新梅;;基于量化的LDPC译码算法的高效实现[J];电子与信息学报;2011年09期
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