Description: 由4个.m文件组成，用于16QAM和64QAM调制的软信息的提取-By 4. M files for 16QAM and 64QAM modulation of the soft information extraction Platform: |
Size: 2048 |
Author:wwyy |
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Description: 提出了一种自动构造特定领域本体的方法，该方法应用术语抽取和多重聚类技术。在术语抽取阶段，通过术语在专业语料与背景语料中出现概率的对比，采用LLR公式对术语进行评分，取得了更好的抽取效果。在层级关系发现过程中，采用上下文共现信息结合HowNet中词语的语义相似度，进行术语间相似度度量，力求获得术语间最合理的相关状况。同时改进了k-medoids聚类算法，更准确地发现术语的层级关系，进而构造出特定领域的本体。-This paper presents an approach to mining domain-dependent ontologies using term extraction and relationship discovery technology.There are two main innovations in the approach. One is extracting terms using log-likelihood ratio, which is based on the contrastive probabilityofterm occurrence in domain corpus and background corpus. The other is fusing together information from multiple knowledge sources as evidencesfor discovering particular semantic relationships among terms. In the experiment, traditional k-mediods algorithm is improved for multi-levelclustering. The approach to produce an ontology for the domain of computer science is applied and promising results are obtained. Platform: |
Size: 100352 |
Author:xiaobai |
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Description: 通过MATLAB软件；通过仿真得出性能曲线；从而比较bpsk的性能-The bit-error rate (BER) of binary phase-shift keying
in Rayleigh fading, using the Alamouti transmission scheme and
receiver selection diversity in the presence of channel-estimation
error, is studied. Closed-form expressions for the BER of log-likelihood
ratio selection, signal-to-noise ratio (SNR) selection, switchand-
stay combining selection, and maximum ratio combining are
derived in terms of the SNR and the cross-correlation coefficient
of the channel gain and its corrupted estimate. Two new selection
schemes, space–time sum-of-squares combining selection diversity
and space–time sum-of-magnitudes selection diversity, are
proposed and proven to provide almost the same performance as
SNR selection, but with much simpler implementations. The effects
of channel- Platform: |
Size: 340992 |
Author:刘小洋 |
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Description: 对数似然比测度下低密度奇偶检验码的译码算法，有很大的价值啊 -Log-likelihood ratio measure under the low-density parity check codes decoding algorithm, there is great value to ah Platform: |
Size: 94208 |
Author:张力 |
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Description: 对数似然比测度下低密度奇偶检验码的译码算法，有很大的价值啊 -Log-likelihood ratio measure under the low-density parity check codes decoding algorithm, there is great value to ah Platform: |
Size: 342016 |
Author:张力 |
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Description: 本文利用软输入软输出信道译码器输出对数似然比随相位偏差变化的规律得到低信噪比MPSK信号的
相位偏差代价函数，并提出一种求解该代价函数的迭代相位搜索方法，以相对较小的运算量实现较高精度的相
位估计。仿真表明，该算法在低信噪比下具有稳定的性能，并且能够克服大多相位估计算法都存在的相位模糊
问题。-In this paper, the soft input soft output channel decoder output log-likelihood ratio with the variation of the phase error signal to noise ratio MPSK signals with low phase error cost function and propose a cost function for solving the iterative phase of the search method relatively less computation to achieve high accuracy phase estimates. Simulation results show that the algorithm is stable under low signal to noise ratio performance, and most of the phase estimation algorithm can overcome the phase ambiguity exists. Platform: |
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Author:motonula |
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Description: This document is about 16 QAM demapping of received data. But its a soft demapping method based Log likelihood ratio(llr). So results can be used as inputs for viterbi decoder or turbo decoder. It is very usefull to decrease BER for communication systems. In addition, QPSK, 64QAM etc. demappers can be derived based on this document. Platform: |
Size: 60416 |
Author:aydim turkken |
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Description: After identifying the best MNT− 1 nodes with the simplified branch metric and the accumulated branch metric at stage NT − 1, we then calculate the LLR of each coded bit utilizing the standard squared Euclidian distance metric.
The log-likelihood ratio (LLR) of a posteriori probability (APP) of each coded bit conditioned on the received signal y is normally calculated using the max-log approximation.-After identifying the best MNT− 1 nodes with the simplified branch metric and the accumulated branch metric at stage NT − 1, we then calculate the LLR of each coded bit utilizing the standard squared Euclidian distance metric.
The log-likelihood ratio (LLR) of a posteriori probability (APP) of each coded bit conditioned on the received signal y is normally calculated using the max-log approximation.
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Author:yuva |
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Description: This soft decoding algorithm for the sumproduct implementation of the ldpc codoes. The program calculates the log likelihood ratio.
And add them all in the . After running the programme type Eji to fing the final matrix of lg likelyhood ratios.H=LDPC parity Check Matrixrx :recieved Signal vector
H=LDPC parity Check Matrix
N0=Noise vriance
iter: Number pf iteration
xHat :Decoded Vector(0/1)-This is soft decoding algorithm for the sumproduct implementation of the ldpc codoes. The program calculates the log likelihood ratio.
And add them all in the . After running the programme type Eji to fing the final matrix of lg likelyhood ratios.H=LDPC parity Check Matrixrx :recieved Signal vector
H=LDPC parity Check Matrix
N0=Noise vriance
iter: Number pf iteration
xHat :Decoded Vector(0/1) Platform: |
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Author:rajen |
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Description: This function implements the composite objective measure
proposed in [1]. It returns three values: The predicted rating of
overall quality (Covl), the rating of speech distortion (Csig) and
the rating of background distortion (Cbak). The ratings are based on the 1-5 MOS scale.In addition, it returns the values of the SNRseg, log-likelihood ratio (LLR), PESQ
and weighted spectral slope (WSS) objective measures. -This function implements the composite objective measure
proposed in [1]. It returns three values: The predicted rating of
overall quality (Covl), the rating of speech distortion (Csig) and
the rating of background distortion (Cbak). The ratings are based on the 1-5 MOS scale.In addition, it returns the values of the SNRseg, log-likelihood ratio (LLR), PESQ
and weighted spectral slope (WSS) objective measures. Platform: |
Size: 5120 |
Author:sami |
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Description: LDPC码的软判决译码算法，概率域LLR—BP算法，其中，概率信息以对数似然比的形式表示。-The decoding algorithm of LDPC . The LLP-BP algorithm of probability field,in which,the probability informationv expressed by the form of log likelihood ratio. Platform: |
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Author:玄川鹤 |
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Description: LDPC码及其基于概率测度的和积译码算法.在此基础上对算法作融合,引入对数似然比概念,阐述了基于对数似然比测度的和积译码算法,对其校验节点消息传递实现技-LDPC codes based on their probability measure and product algorithm. Based on this algorithm for integration, the introduction of the log-likelihood ratio concept, elaborated based on the likelihood ratio measure and product algorithm, the number of its school check node message passing techniques to achieve Platform: |
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Author:孟 |
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Search - Log likelihood ratio