Concatenated coding and decoding method based on LDPC codes and constellation rotation quasi-orthogonal space-time codes
An LDPC code, concatenated coding technology, applied in multi-carrier systems, through diversity reception to prevent/detect errors, etc., can solve the problem of not being able to meet the requirements of full diversity and full rate at the same time
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specific Embodiment approach 1
[0040] Specific implementation mode 1. Combination figure 1 Illustrate this specific embodiment, based on the concatenated encoding and decoding method of LDPC code and constellation rotation quasi-orthogonal space-time code, it is completed by the following steps:
[0041] Encoding method:
[0042] Step 1, sending the information sequence of the digital information source into the LDPC encoder for encoding to obtain the LDPC encoding output sequence;
[0043] Step 2, performing QPSK modulation on the LDPC encoded output sequence to obtain a modulated codeword symbol;
[0044] Step 3, encoding the modulated codeword symbols obtained in step 2 through a quasi-orthogonal space-time block code encoder based on constellation rotation, to obtain encoded codeword symbols;
[0045] Decoding method:
[0046] Step 4, the encoded codeword symbol described in step 3 is decoded by a quasi-orthogonal space-time block code decoder based on constellation rotation to obtain decoded soft in...
specific Embodiment approach 2
[0054]Specific embodiment two, based on the signal transmission and reception method of the concatenated encoding and decoding method based on LDPC code and constellation rotation quasi-orthogonal space-time code described in specific embodiment one:
[0055] Launch process:
[0056] Step 1, send the information sequence of the digital information source into the LDPC coder to encode, and obtain the coded sequence c=(c 1 , c 2 ,...,c n );
[0057] Step 2, the coding sequence c=(c described in step 1 1 , c 2 ,...,c n ) performs QPSK modulation to obtain modulated codeword symbols;
[0058] Step 3. According to the modulated codeword symbols obtained in step 2, match the best constellation and perform constellation rotation to obtain the coding matrix X:
[0059] X = x 1 x 2 ...
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