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

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 havenot 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] figure 1 A schematic diagram showing existing data transmission using LDPC codes; figure 2 A flow chart of an existing method for data transmission using LDPC codes is shown. Such as figure 1 As shown, 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...

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 ratio, both information bits and redundant bits will be greatly affected by noise during transmission.

If an error occurs in the information bits during transmission, even if the receiving end obtains all the redundant bits, it cannot be decoded successfully

If there is a bit error in the redundant bits during transmission, the receiving end still cannot decode successfully because the sending end only transmits the same part of the redundant bits once.

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