Ethernet coding method and apparatus
This application discloses an Ethernet coding method and apparatus, to adapt to a scenario in which a higher transmission bit error rate is caused by a high bandwidth. The method includes: a transmit end encodes first to-be-encoded information by using a first forward error correction (FEC) codeword, to obtain first encoded data, where the first forward error correction FEC codeword is a Reed-Solomon forward error correction (RS-FEC) codeword; and the transmit end encodes the first encoded data by using a second FEC codeword, to obtain second encoded data, where a code length N and an information bit length K of the second FEC codeword satisfy the following formula: M1*N/K≤M2, where M1 is a throughput of the first encoded data, and M2 is a throughput of the second encoded data.
1. A coding method, comprising:
encoding, by a transmit end, first to-be-encoded information by using a first forward error correction (FEC) codeword, to obtain first encoded data, wherein the first FEC codeword is a Reed-Solomon forward error correction (RS-FEC) codeword; and
encoding, by the transmit end, the first encoded data by using a second FEC codeword, to obtain second encoded data, wherein a code length N and an information bit length K of the second FEC codeword satisfy the following formula: M1*N/K≤M2, wherein M1 is a rate of the first encoded data, and M2 is a rate at a physical media dependent (PMD) layer;
wherein encoding, by the transmit end, the first to-be-encoded information by using the first FEC codeword, to obtain the first encoded data comprises:
performing, by the transmit end, FEC encoding on the first to-be-encoded information by using y first FEC codewords, to obtain y groups of encoded data, wherein y is an even number greater than or equal to 2; and
performing, by the transmit end, first interleaving on the y groups of encoded data to obtain the first encoded data, wherein the first interleaving meets an interleaving matrix in which quantities of rows and columns are respectively L and P, L and P are even numbers greater than or equal to 2, and P is a quantity of data output lanes that transmit the first encoded data;
wherein encoding, by the transmit end, the first encoded data by using the second FEC codeword comprises:
encoding the first encoded data transmitted through P data output lanes.
2. The method according to claim 1 , wherein the data output lanes comprise physical medium attachment (PMA) lanes or physical coding sublayer (PCS) lanes.
3. The method according to claim 1 , wherein row elements in a row of the interleaving matrix respectively correspond to data obtained from the y groups of encoded data in a round robin distribution.
4. The method according to claim 2 , wherein a same round robin rule is used for each of the L rows, or different round robin rules are used for every consecutive y rows in the L rows.
5. The method according to claim 1 , wherein the method further comprises:
transmitting, by the transmit end, the second encoded data through P physical medium attachment (PMA) lanes, and processing the second encoded data transmitted through the P PMA lanes.
6. The method according to claim 2 , wherein performing, by the transmit end, the first interleaving on the y groups of encoded data comprises:
transmitting, by the transmit end, the y groups of encoded data through P PMA lanes; and
performing the first interleaving on the y groups of encoded data transmitted through the P PMA lanes.
7. The method according to claim 6 , wherein the P PMA lanes correspond to sequence numbers 0 to (P−1), and the P columns of the interleaving matrix respectively one-to-one correspond to encoded data from the P PMA lanes; and row elements whose column sequence numbers are odd numbers in a row of the interleaving matrix respectively correspond to encoded data of PMA lanes whose sequence numbers are 0 to (P/2−1), and row elements whose column sequence numbers are even numbers in the row of the interleaving matrix respectively correspond to encoded data of PMA lanes whose sequence numbers are P/2 to P.
8. The method according to claim 1 , wherein a value of P is 16 or 32.
9. The method according to claim 1 , wherein N/K=18/17.
10. The method according to claim 1 , wherein construction of the second FEC codeword is (N,K,m) and m is an order of a Galois field in which the second FEC codeword is located; and
the second FEC codeword comprises any one of the following codewords, comprises a spatially coupled code constructed by using any one of the following codewords as a subcode, or comprises a multi-level code constructed by using any one of the following codewords as a subcode: Hamming code Hamming(144,136,8), Hamming(180,170,10), extended Hamming code eHamming(180,170,9), double extended Hamming code DE-Hamming(180,170,8), Bose, Ray-Chaudhuri, and Hocquenghem code BCH(360,340,10), double extended BCH code DE-BCH(360,340,9), DE-BCH(576,544,10), or BCH(594,561,11).
11. The method according to claim 1 , wherein construction of the second FEC codeword is (N,K,m) and m is an order of a Galois field in which the FEC codeword is located; and
the second FEC codeword comprises any one of the following codewords, comprises a spatially coupled code constructed by using any one of the following codewords as a subcode, or comprises a multi-level code constructed by using any one of the following codewords as a subcode: Hamming(126,119,7), Hamming(127,119,8), Hamming(145,136,9), Hamming(179,170,9), eHamming(127,119,7), eHamming(145,136,8), eHamming(179,170,8), eHamming(181,170,10), Bose, Ray-Chaudhuri, and Hocquenghem code BCH(290,272,9), BCH(358,340,9), BCH(574,544,10), extended BCH code eBCH(291,272,9), eBCH(359,340,9), eBCH(361,340,10), eBCH(575,544,10), or DE-BCH(362,340,10).
12. The method according to claim 1 , wherein the method further comprises:
performing, by the transmit end, one or more of the following processing on the second encoded data: transmission through P data output lanes, second interleaving, data modulation, or optical-to-electrical conversion, wherein P is an even number greater than or equal to 2; and
sending, by the transmit end, processed data to a receiving device.
13. An apparatus, comprising:
an input interface circuit, configured to obtain first to-be-encoded information;
one or more logic circuits, configured to:
encode the first to-be-encoded information by using y first forward error correction (FEC) codewords, to obtain y groups of encoded data, wherein y is an even number greater than or equal to 2, wherein the first FEC codewords are Reed-Solomon forward error correction (RS-FEC) codewords;
perform first interleaving on the y groups of encoded data to obtain a first encoded data, wherein the first interleaving meets an interleaving matrix in which quantities of rows and columns are respectively L and P, L and P are even numbers greater than or equal to 2, and P is a quantity of data output lanes that transmit the first encoded data; and
encode the first encoded data transmitted through P data output lanes by using a second FEC codeword to obtain second encoded data, wherein a code length N and an information bit length K of the second FEC codeword satisfy the following formula: M1*N/K≤M2, wherein M1 is a rate of the first encoded data, and M2 is a rate at a physical media dependent (PMD) layer; and
an output interface circuit, configured to output the second encoded data.
14. An apparatus comprising:
at least one memory; and
one or more processors, configured to:
encode, first to-be-encoded information by using y first forward error correction (FEC) codewords, to obtain y groups of encoded data, wherein y is an even number greater than or equal to 2, wherein the first FEC codewords are Reed-Solomon forward error correction (RS-FEC) codewords; and
perform first interleaving on the y groups of encoded data to obtain the first encoded data, wherein the first interleaving meets an interleaving matrix in which quantities of rows and columns are respectively L and P, L and P are even numbers greater than or equal to 2, and P is a quantity of data output lanes that transmit the first encoded data; and
encode, the first encoded data transmitted through P data output lanes by using a second FEC codeword, to obtain second encoded data, wherein a code length N and an information bit length K of the second FEC codeword satisfy the following formula: M1*N/K≤M2, wherein M1 is a rate of the first encoded data, and M2 is a rate at a physical media dependent (PMD) layer.
15. The apparatus according to claim 14 , wherein the data output lanes comprise physical medium attachment (PMA) lanes or physical coding sublayer (PCS) lanes.
16. The method according to claim 1 , wherein the P data output lanes are real lanes or virtual lanes.
17. The method according to claim 1 , wherein y=4.
18. The method according to claim 1 , wherein N=x*n and K=x*k; and x, n, and k are positive integers, wherein x=8.
19. The apparatus according to claim 14 , wherein the P data output lanes are real lanes or virtual lanes.
20. The apparatus according to claim 14 , wherein y=4.
21. The apparatus according to claim 14 , wherein N=x*n and K=x*k; and x, n, and k are positive integers, wherein x=8.