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Retransmission method and equipment based on low density checkout code

By using a priori information between the sender and the receiver to replace some bits of the information sequence to be retransmitted for LDPC encoding and decoding, the problem of low system throughput in HARQ technology is solved and the verification performance and error correction capabilities are improved. , meeting the needs for higher data transmission rates and error correction capabilities.

Inactive Publication Date: 2009-03-04
HUAWEI TECH CO LTD
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Problems solved by technology

However, the inventors of the present invention have found that to support IR, both encoding and decoding ends need to support multi-rate, and the complexity is higher than that of Chase, but the system throughput using Chase is lower

Method used

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Embodiment Construction

[0034] In order to make the purpose, technical solution and advantages of the present invention clearer, the following will further describe the implementation of the present invention in detail in conjunction with the accompanying drawings.

[0035] The first embodiment of the present invention relates to an LDPC-based retransmission method. In this embodiment, the sending end uses prior information to replace some bits on the information sequence to be retransmitted, and performs LDPC encoding on the replaced information sequence to obtain an LDPC check sequence; send the LDPC check sequence to the receiving end . Wherein, the prior information is information known by both the sending end and the receiving end. The receiving end uses the LDPC check sequence received this time to decode the information sequence containing a priori information; if the decoding is successful, remove the a priori information from the decoded information sequence and refill it In the received i...

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Abstract

The invention relates to the communication field, and discloses a retransmitting transmission method based on low-density parity check code (LDPC) and transmission equipment to improve the system throughput. In the invention, when the retransmitting is in need, the prior information known by both a transmitting terminal and a receiving terminal is adopted to replace part bits on an information sequence to be transmitted; the information sequence after replaced is carried out LDPC so as to obtain an LDPC checking sequence which is transmitted to the receiving terminal, wherein, the prior information is the information known by both the transmitting and receiving terminals; after receiving the LDPC checking information, the receiving terminal utilizes the LDPC checking information to carry out decoding on the information sequence containing the prior information; if the decoding is succeed, after removing the prior information, the information sequence obtained by decoding is re-filled into the information sequence previously obtained; and an LDPC checking sequence corresponding to the information sequence previously obtained is used for re-decoding to obtain a complete information sequence.

Description

technical field [0001] The present invention relates to the communication field, in particular to channel codec transmission technology. Background technique [0002] Channel coding and decoding technology has a relatively independent position in the whole mobile communication system, and it is one of its key technologies, which determines the performance of the mobile communication system. Channel coding and decoding is mainly to reduce the signal propagation power and solve the inevitable signal fading problem in the wireless propagation environment. [0003] The use of channel coding and decoding technology combined with interleaving technology can reduce the bit error rate performance. Compared with the case of no coding, the traditional convolutional code can reduce the bit error rate by two orders of magnitude to 10-3~10-4, while the Turbo code can Further reduce the bit error rate to 10-6. The Low Density Parity Check (LDPC for short) code is another hot spot in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18H04L1/00
CPCH04L1/0057H03M13/6356H04L1/1819H03M13/1185H03M13/6306
Owner HUAWEI TECH CO LTD
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