多進(jìn)制線性分組碼的線性規(guī)劃譯碼算法研究
[Abstract]:Since the error-correcting code theory was put forward more than 60 years ago, great achievements have been made in both theory and engineering application, among which Linear programming LP decoding is one of them. In this paper, a new LP decoding algorithm with polynomial time complexity is proposed. The theoretical and experimental results show that the method satisfies the requirements of "ML characteristics" and "codeword independence" under certain conditions. The results show that the algorithm is more efficient than LP decoding algorithm proposed by Flanagan. The main contents and research results are as follows: 1. This paper first introduces the basic concept of linear block code and its Tanner graph representation, and introduces the basic concept of linear programming. Since the optimal value of linear programming is always obtained at the vertex of polyhedron composed of feasible domains, Feldman and others creatively put forward LP decoding theory. Secondly, the LP decoding algorithm of Feldman is discussed, and the LP decoding algorithm based on parity check polyhedron is designed for binary linear block codes. Finally, the simulation results show that the performance of this method is equivalent to that of Feldman LP decoding algorithm. In this paper, the decoding of multiary linear block codes is studied. Firstly, the flow of Belief propagation BP decoding algorithm is described by combining the check matrix of multiary linear block codes and the representation of Tanner diagram. Secondly, the principle of Flanagan LP decoding method and its mathematical optimization model are introduced in detail from the Maximum LikelihoodML decoding algorithm. It is found that the complexity of the Flanagan LP decoding algorithm increases exponentially with the line repetition of the check matrix, and it is difficult to be implemented in engineering. At the same time, the problem of high complexity of the Flanagan LP decoding model is verified by simulation experiments. The study of linear programming polyhedron structure is also an important part of this paper. This paper mainly discusses the basic method of describing multivariate parity check polyhedron, constructs a new 2Q element parity check polyhedron, and gives several important properties of the polyhedron. At last, it analyzes these theories and proves them. In this paper, the problem of LP decoding for multiary linear block codes is discussed, and a new LP decoding algorithm with polynomial time complexity for multiary linear block codes is proposed. For multi-ary linear block codes, the parity-check polyhedron is used to relax ML decoding into a new LP decoding. The linear programming model contains only auxiliary variables and constraints of polynomial complexity. Finally, it is not only proved that if the equivalent binary codeword of the multiary codeword can form the subspace based on GF (2) and the channel satisfies the symmetry characteristic, the LP decoding algorithm has "ML characteristics" and "codeword independence". At the same time, the simulation results show that the LP decoding algorithm not only approximates ML decoding algorithm, but also achieves the same performance as Flanagan LP decoding algorithm, and its execution efficiency under 16QAM modulation is nearly 15 times higher than that of Flanagan LP decoding algorithm.
【學(xué)位授予單位】:西安電子科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:TN911.22
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