Method for carrying out data transmission using the low-density parity check code

A low-density parity and data technology, which is applied in the field of data transmission of low-density parity check LDPC codes at the sending end and the receiving end. problems, to the effect of increasing the likelihood

Inactive Publication Date: 2007-09-12
NOKIA SOLUTIONS AND NETWORKS SYSTEM TECHNOLOGY (BEIJING) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, when the network condition is poor and the signal-to-noise ratio of the transmission channel is lower than the minimum signal-to-noise ratio required for successful decoding of the LDPC-encoded codeword, even if all redundant bits are sent to the receiving end, it cannot successfully decoded
Therefore, the throughput improvement cannot be obtained at low signal-to-noise ratio
[0010] In addition, in the case of low signal-to-noise rati

Method used

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  • Method for carrying out data transmission using the low-density parity check code
  • Method for carrying out data transmission using the low-density parity check code
  • Method for carrying out data transmission using the low-density parity check code

Examples

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Embodiment 1

[0035] In this embodiment, the sending end sends all the information bits and redundant bits to the receiving end during the initial transmission. If the receiving end cannot perform LDPC decoding correctly, the sending end punctures the information bits and places Insert dummy bits, then perform LDPC encoding, and send the new redundant bits to the receiving end; the receiving end determines the value of the information bits that have not been punched according to the new redundant bits, as the value of all information bits Auxiliary for LDPC decoding. In this embodiment, data retransmission is performed only once.

[0036] Before the data transmission in this embodiment is executed, the network system performing data transmission pre-sets the puncturing mode and the number of punctures for each sending end and receiving end, so that the sending end removes information bits and the receiving end adds dummy bits. be consistent.

[0037] In this embodiment, the redundant bits...

Embodiment 2

[0057] In order to further improve the success rate of LDPC decoding at the receiving end, two retransmissions may be performed. In this embodiment, during the second retransmission, the sender punctures the information bits again, that is, removes a part of the information bits from the information bits that were not punctured in the first puncture, and then punctures the remaining bits Charge with 0 塡. Then the receiving end performs LDPC encoding on the re-punctured information bits to form third redundant bits, and sends the third redundant bits to the receiving end. The receiving end uses the third redundant bit to perform LDPC decoding, obtains the value corresponding to the unpunctured information bit in the re-punching, and updates the received information bit; and then uses the second redundant bit in the same way bits and the first redundant bits are LDPC decoded.

[0058] FIG. 5 shows a schematic diagram of data transmission according to the method of Embodiment 2...

Embodiment 3

[0076] As shown in Figure 8, in the prior art, the receiving end uses bit nodes and check nodes to perform LDPC decoding, where bit nodes correspond to information bits and redundant bits as decoding objects, and check bits correspond to parity equation. When multiple times of LDPC decoding is performed using redundant bits retransmitted, the data corresponding to each information bit corresponds to the bit node in the same way, and each check node only performs decoding on the content of the bit node at a fixed position according to the decoding algorithm Verify. When the decoding fails due to the error of some information bits in multiple retransmissions, that is, the bit nodes corresponding to these information bits constitute the termination set, such as the bit nodes v1, v2 and v4 in Figure 8, due to the Each bit node of LDPC is checked by a fixed check node every time LDPC is decoded, even if the information bits are continuously punched to form redundant bits that are ...

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PUM

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Abstract

This invention disclosesa low-density parity-check application LDPC in the transmitter and receiver for data transmission. The transmitter will first make information transmission LDPC code, and the bits of information and the first redundant bits sent to the receiver. Information referred to the receiver to receive data and the corresponding bit redundant bits, LDPC decoder and request when it is failed. The transmitter receiving data Retransmission request, and will do LDPC coding to the information bits after it drilled them .Then it will send the left bits to receiver. The receiver will drill the received data in the same way as before, and then will do LDPC decoding to the second left bits, then to getthe bits of information are not drilling, and then use the bits of information have not been updated to replace the received data it will do LDPC decoding to the new data to get information bits.

Description

technical field [0001] The invention relates to data communication technology, in particular to a data transmission method using a low-density parity check LDPC code at a sending end and a receiving end in data communication. Background technique [0002] In the existing data communication technology, in order to increase the protection of the data to be transmitted, the LDPC code with a sparse check matrix is ​​usually used to encode and decode the data at the sending end and the receiving end respectively. [0003] FIG. 1 shows a schematic diagram of an existing data transmission using LDPC codes; FIG. 2 shows a flow chart of an existing data transmission method using LDPC codes. As shown in FIG. 1 , during data transmission, the sending end sends all the information bits and part of the redundant bits R1 to the receiving end during the initial transmission. When the signal-to-noise ratio of the channel is low, if the receiving end cannot correctly decode the data packet ...

Claims

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Application Information

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IPC IPC(8): H04L1/00H03M13/11
Inventor 兰普·马蒂尔斯朱嘉张海滨施惠丰
Owner NOKIA SOLUTIONS AND NETWORKS SYSTEM TECHNOLOGY (BEIJING) CO LTD
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