Concatenated coding and decoding method based on LDPC codes and constellation rotation quasi-orthogonal space-time codes
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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
Inactive Publication Date: 2012-10-31
HARBIN INST OF TECH
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[0004] The present invention aims to solve the problem that the existing method cannot simultaneously meet the requirements of full diversity and full rate when LDPC and space-time block codes are concatenated, thereby providing concatenation based on LDPC codes and constellation rotation quasi-orthogonal space-time codes Coding and decoding method and its signal transmitting and receiving method
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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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Abstract
The invention provides a concatenated coding and decoding method based on LDPC codes and constellation rotation quasi-orthogonal space-time codes and a signal emitting and receiving method thereof, which relates to a coding and decoding method and a signal emitting and receiving method thereof. The invention solves the problem that when the LDPC and space-time block codes (STBC) are in cascade connection in the existing method, the requirements of full diversity and full rate can not be achieved simultaneously. The coding method comprises the following steps: transferring an information sequence of a digital source into an LDPC coder for coding, then carrying out QPSK modulation, and coding by a quasi-orthogonal STBC coder based on constellation rotation to acquire the coded information. The decoding method comprises the following steps: decoding by a quasi-orthogonal STBC decoder based on constellation rotation, and inputting the acquired decoding soft information into an LDPC decoder for iterative decoding to acquire the decoded information. In the emitting process, four emitting antennas are used for emitting the coded information. In the receiving process, four antennas are used for receiving and then decoding the coded information. The invention is suitable for wireless communication systems of quasi-static flat Rayleigh fading channels.
Description
technical field [0001] The present invention relates to a coding and decoding method and its signal transmitting and receiving method. Background technique [0002] Modern wireless communication systems require high data rates, high reliability, high power efficiency, and bandwidth utilization. MIMO systems achieve higher capacity gains than single-antenna systems by utilizing multiple input-output antennas. For MIMO systems, it is very necessary to adopt advanced channel coding and decoding technology. Space-time coding is a feasible and effective method to achieve or approach the capacity of MIMO wireless channel. Its purpose is to overcome the impact of multipath fading through diversity gain. Typical space-time codes include space-time layered codes, space-time trellis codes, and space-time block codes. In addition, there are several improved space-time codes, such as quasi-orthogonal space-time codes and quasi-orthogonal space-time block codes based on constellation...
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