当然，sum product algorithm 有另一个名字叫 belief propagation。 他的变种非常多，不仅仅是 implementat...
Sum-Product算法如下: Sum-Product(x){ if(x是变量节点){ if(x为叶子节点) return 1; subFx = {x的子节点(全为因子节点)}; result = 1; for(x_i in subFx){ result = result * Sum-Product(x_i); } return result ; } if(x是因子节点) { if(x是叶子节点) return f(xp);//f为x表示...
The sum-product algorithm, which belongs to the class of message-passing algorithms, is an iterative decoding algorithm for LDPC codes that is based on passing likelihood ratios between variable and check nodes. The variable nodes receive the outputs of the channel and pass the likelihoods of cod...
In this work, we introduce a novel decoding algorithm named "Reliability Ratio Weighted Bit Flipping鈥揝um Product" (RRWBFSP) is proposed for regular LDPC codes. "Sum Product" [4] and "Reliability Ratio Weighted Bit Flipping" [6] are two separate methods that are combined in the new ...
We use this method with high dimensional parity codes and array-LDPC codes as its constituent codes. We show that we can employ the sum-product algorithm with appropriate likelihood functions in this scheme and analyze the performance of these coding schemes.关键词:...
Introduces the factor graph and presents the sum-product algorithm which operates in a factor graph. Operation of the sum-product algorithm in a factor gr... Kschischang,Frank,R.,... - 《IEEE Transactions on Information Theory》 被引量: 0发表: 2001年 Factor Graphs and the Sum Product Al...
A simple, yet effective decoding algorithm is proposed for low-density parity-check (LDPC) codes, which significantly simplifies the check node update computation of the optimal sum-product algorithm. It achieves essentially optimal performance by applying scaling in the decoder's extrinsic information....
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Turbo code has been adopted for the third-generation mobile phone standard (3GPP standard), and it will be adopted for next generation mobile communication standard with high-speed communication.To apply 3GPP standard Turbo code for high-speed communication, sum-product algorithm (SPA) decoding which...
Use the sum-to-product formulas to write the sum or difference as a product. cos(ϕ+2π)+cosϕ Sum-to-Product Formulas: When taking the sum of two different cosine functions, it will be helpful to employ a sum-to-product trigonometric identity...