Coding and decoding method and device, and system

A method of decoding data, wherein the method is implemented by a receive device and comprises:

• receiving data from a transmit device;
• and
• decoding the data by:
• performing one-codeword forward error correction (FEC) decoding on to-be-decoded data by using a first FEC decoding type related to the length of the to-be-decoded data,
• when the to-be-decoded data is not entirely decoded, continually performing one-codeword FEC decoding on the remaining to-be-decoded data by using a second FEC decoding type related to the length of the remaining to-be-decoded data, wherein a length of parity bits of the first FEC decoding type is longer than a length of parity bits of the second FEC decoding type.

A device for coding data, comprising

• a processor, a memory, a sending device, and a communications interface, wherein the memory stores instructions for implementing a coding method, and the processor is connected to both the memory and the sending device through the communications interface;
• and
• when the processor invokes the instructions in the memory, the following steps are executed:
• performing one-codeword forward error correction (FEC) coding on to-be-coded data by using a first FEC coding type related to the length of the to-be-coded data;
• and,
• when the to-be-coded data is not entirely coded, continually performing one-codeword FEC coding on the remaining to-be-coded data by using a second FEC coding type related to the length of the remaining to-be-coded data, wherein a length of parity bits of the first FEC coding type is longer than a length of parity bits of the second FEC coding type;
• wherein sending device sends coded data to a receive device.

A device for decoding data, wherein the decoding device comprises:

• a receiving device that receives data;
• a processor, a memory, and a communications interface, wherein the memory stores instructions for implementing a decoding method, and the processor is connected to both the memory and the receiving device through the communications interface;
• and
• when the processor invokes the instructions in the memory, the following steps are executed:
• performing one-codeword forward error correction (FEC) decoding on to-be-decoded data by using a first FEC decoding type related to the length of the to-be-decoded data, and,
• when the to-be-decoded data is not entirely decoded, continually performing one-codeword FEC decoding on the remaining to-be-decoded data by using a second FEC decoding type related to the length of the remaining to-be-decoded data, wherein a length of parity bits of the first FEC decoding type is longer than a length of parity bits of the second FEC decoding type.