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Description: The Viterbi algorithm is the same as the binary case with one main difference: The survivor sequences include the uncoded bits, which are decided at each trellis stage when selecting one of two parallel branches with the largest correlation metric.
Presently, only 8-PSK modulation is considered. Extensions to higher-order modulations can be implemented following a similar procedure.
-The Viterbi algorithm is the same as the bin Indigenous case with one main difference : The survivor sequences include the uncoded bit s, which are decided at each trellis stage when sel ecting one of two parallel branches with the deviation gest correlation metric. Presently, only 8-PSK modulation is considered. Extensio ns to higher-order modulations can be implemen ted following a similar procedure.
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Size: 5377 |
Author: 里海 |
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Description:
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Size: 5120 |
Author: 里海 |
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Description: 基于Turbo码的网格编码调制的c代码，包括了VQ，TCQ、TCVQ、SQ以及维特比算法等，内容非常全面，不过要在linux平台上运行。-Turbo codes based on trellis coded modulation c code, including the VQ, TCQ, TCVQ, SQ and the Viterbi algorithm, the content is very comprehensive, but in linux platform.
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Size: 51200 |
Author: jiangyan |
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Description: SOVADEC is an implementation of the soft input soft output Viterbi
algorithm. The algorithm can be called using
DEC = SOVADEC( MSG, LLR, TRELLIS, WIN )-SOVADEC is an implementation of the soft input soft output Viterbi algorithm. The algorithm can be called using DEC = SOVADEC (MSG, LLR, TRELLIS, WIN)
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Size: 3072 |
Author: aeou607 |
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Description: Viterbi based trellis decoder for (7,4) - binary BCH code-Viterbi based trellis decoder for (7,4)- binary BCH code
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Size: 1024 |
Author: shahifaqeer |
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Description: viterbi trellis generator
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Size: 3072 |
Author: amnass |
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Description: Viterbi解码器Matlab版.生成输入、输出表、状态转移表，沿Trellis进行剪枝，记录保留路径，最后返回并得到最终解码。-Matlab version of Viterbi decoder. Generate input, output tables, state transition table, along the Trellis for pruning, record succeed path, finally trace back and get eventually decoding sequence.
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Size: 3072 |
Author: 苏英 |
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Description: a code from me for forming for a trellis table to write a viterbi codes
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Size: 2048 |
Author: jerry |
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Description: Viterbi, Trellis and Turbo Code implementation on a next-generation DSP
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Size: 20480 |
Author: yahyajasim |
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Description: It is a verilog code for viterbi decoding with trellis diagram
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Size: 409600 |
Author: Murthy |
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Description: trellis generation is used for viterbi decoding of convolutional coding
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Size: 1024 |
Author: rick |
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Description: This function implememts Soft Output Viterbi Algorithm in trace back mode
Input:
rec_s: scaled received bits. rec_s(k) = 0.5 * L_c(k) * y(k)
L_c = 4 * a * Es/No, reliability value of the channel
y: received bits
g: encoder generator matrix in binary form, g(1,:) for feedback, g(2,:) for feedforward
L_a: a priori information about the info. bits. Extrinsic info. from the previous
component decoder
ind_dec: index of the component decoder.
=1: component decoder 1 The trellis is terminated to all zero state
=2: component decoder 2 The trellis is not perfectly terminated.
Output:
L_all: log ( P(x=1|y) ) / ( P(x=-1|y) )
Frame size, info. + tail bits- This function implememts Soft Output Viterbi Algorithm in trace back mode
Input:
rec_s: scaled received bits. rec_s(k) = 0.5 * L_c(k) * y(k)
L_c = 4 * a * Es/No, reliability value of the channel
y: received bits
g: encoder generator matrix in binary form, g(1,:) for feedback, g(2,:) for feedforward
L_a: a priori information about the info. bits. Extrinsic info. from the previous
component decoder
ind_dec: index of the component decoder.
=1: component decoder 1 The trellis is terminated to all zero state
=2: component decoder 2 The trellis is not perfectly terminated.
Output:
L_all: log ( P(x=1|y) ) / ( P(x=-1|y) )
Frame size, info. + tail bits
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Size: 1024 |
Author: yk |
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Description: 有一个基本的格子结构必须提供的Viterbi译码算法。因此，有两个步骤需要在一个特定组合的格子和调制的仿真：第一就是棚架结构。-
Trellis structure，TCM schemes have an underlying trellis structure that must be provided to the Viterbi decoding algorithm. Therefore, there are two steps required in the simulation of a particular combination of trellis and modulation
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Size: 1024 |
Author: karen |
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Description: SOVATEC是实施软输入软输出维特比
算法。该算法可以使用被称为其中味精是软输入（码字），LLR是每比特的先验信息对位（对数似然比），棚架棚架结构描述卷积编码器，用于编码的原始信息的消息。- SOVADEC is an implementation of the soft input soft output Viterbi
algorithm. The algorithm can be called using
DEC = SOVADEC( MSG, LLR, TRELLIS, WIN )
where MSG is the soft input (codeword), LLR is a priori information
per bit about the bits (log likelihood ratios), TRELLIS is the
trellis structure describing the convolutional encoder used to
encode the original information message.
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Size: 3072 |
Author: 冬瓜 |
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Description: matlab实现8PSK TCM网格编码调制，包含维特比译码和与未编码的QPSK误码性能比较-matlab implementation of TCM trellis coded modulation 8PSK, including Viterbi decoding and uncoded QPSK BER performance
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Size: 5120 |
Author: 高哲 |
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Description: 在这项工作中，我们对待这个问题的恢复正确的消息，如果额外的位（假报警）已加入的消息体中，在随机的位置。这的情况是常见的一些是与选择性嵌入水印系统
典型的当人类视觉系统（或录音）注册成立，以提高质量水印系统。我们提出一个有效的解码方案
使用一些修改的“维特比算法的代码。添加额外的状态表示可能的误报率和一个新的扩展算法的改进网格提出图。仿真结果表明，我们的算法在高效率的检测随机的误报率很高。-In this work, we treat the problem of recovering the correct message if
extra bits (false alarms) are added to the body of the message at random locations. This
situation is common for some watermarking systems with selective embedding which is
typical when the human visual (or audio) system is incorporated to enhance the quality of
the watermarking system. We propose an efficient decoding scheme for convolutional
codes using some modifications of‘ the Viterbi algorithm. Extra states are added to
represent the possible false alarms and a new expansion algorithm of the modified trellis
diagram is proposed. The simulation results show the high efficiency of our algorithm in
detecting random false alarms with high rates.
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Size: 382976 |
Author: 白合 |
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Description: 4 State trellis for Mimo using viterbi hard decoding
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Size: 4096 |
Author: Gun Zha Xin |
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Description: trellis based hard viterbi decoder for conultional encoder with rate 1/2 and generator polynomial [13,15] with initial zero state
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Size: 1024 |
Author: Ahmed Ibrahim |
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