物理层无码率码的研究与实现

发布时间：2018-05-22 19:27

本文选题：SR-Kite码 + FPGA　；参考：《西安电子科技大学》2014年硕士论文

【摘要】：喷泉码的出现改变了人们对传统信道编码固定码率的认识。发送端不断发送编码符号,直到接收端能够正确接收。如今无喷泉码从删除信道推广到了有噪信道,对于有噪信道的喷泉码的设计与硬件实现仍需要研究。本文首先介绍了数字喷泉码的研究现状和使用在删除信道上的喷泉码,然后重点介绍了可以应用在AWGN信道上的无码率码Kite码。从易于硬件实现的角度,提出了半随机simi-random Kite(SR-Kite)码构造算法。其次,本文构造了信息位长度为1024的SR-Kite码,在分析了各类译码算法的优缺点基础上,提出了递增冗余的高效译码方案。并通过对该码的理论分析和性能仿真,确定了FPGA硬件实现中的关键参数。接着,本文针对SR-Kite码具有双对角结构的特点,采用了一种单向递归的流水编码方法。编码器采用一种块间并行列间串行的处理结构计算中间变量,有效提高了编码速率。并进行逻辑综合和时序仿真,验证了编码器结果的正确性最后,由于SR-Kite码校验矩阵不具备循环结构或者准循环结构,在之前码构造的基础之上提出了一种基于分层译码SR-Kite译码器的实现设计方案。并通过行间置换的手段,将原先不可分层的SR-Kite码转换成可分层码。给出了具体硬件实现方案,并验证了译码器结果的正确性。
[Abstract]:The appearance of fountain code has changed people's understanding of the fixed bit rate of traditional channel coding. The sender sends the coded symbols until the receiver can receive them correctly. Nowadays, fountain free code is extended from deleted channel to noisy channel. The design and hardware implementation of fountain code for noisy channel still need to be studied. This paper first introduces the research status of digital fountain code and the fountain code used in deleted channel, and then introduces the Kite code without rate code which can be applied to AWGN channel. From the point of view of easy hardware implementation, a semi-random simi-random SR-Kite) code construction algorithm is proposed. Secondly, SR-Kite codes with information bit length of 1024 are constructed in this paper. Based on the analysis of the advantages and disadvantages of various decoding algorithms, an efficient decoding scheme with incremental redundancy is proposed. Through the theoretical analysis and performance simulation of the code, the key parameters of FPGA hardware implementation are determined. Then, aiming at the double diagonal structure of SR-Kite codes, a one-way recursive pipelining coding method is proposed. The encoder uses a serial processing structure between blocks and rows to calculate the intermediate variables, which effectively improves the coding rate. Logic synthesis and timing simulation are carried out to verify the correctness of the encoder results. Finally, because the SR-Kite code check matrix does not have a cyclic structure or a quasi-cyclic structure, Based on the construction of previous codes, a design scheme of SR-Kite decoder based on layered decoding is proposed. By the method of interline substitution, the original unlayered SR-Kite codes are converted into layered codes. The hardware implementation scheme is given, and the correctness of the decoder results is verified.
【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

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