COMMUNICATION APPARATUS, TRANSMITTER, RECEIVER, AND ERROR CORRECTION OPTICAL COMMUNICATION SYSTEM

• US 20070162831A1
• Filed: 03/06/2007
• Published: 07/12/2007
• Est. Priority Date: 11/10/2005
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Suzuki, Naoki, Mizuochi, Takashi, Kozaki, Seiji
• Granted Patent: US 7,917,833 B2
• Time in Patent Office: Days
• US Class Current: 714/776
• CPC Class Codes: H03M 13/1515 Reed-Solomon codes
• CPC Class Codes: H03M 13/17 Burst error correction, e.g. error trapping, Fire codes
• CPC Class Codes: H03M 13/2707 Simple row-column interleaver, i.e. pure block interleaving
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27

Abstract

A communication apparatus includes a transmitter and a receiver, wherein the transmitter further includes: an interleaver that rearranges positions of bits of an information frame; an FEC encoder that performs an error correction encoding to the information frame whose bit positions have been rearranged; and a selector that inserts FEC parity into predetermined positions of the information frame, to thereby generate a transmission signal, whereas the receiver includes: a selector that extracts an information frame part and an FEC parity part from a reception signal; an interleaver that rearranges positions of the bits of the information frame part using the same rule as that used at that transmitter side; an FEC decoder that corrects an error of bits rearranged based on the error correction parity part; and a de-interleaver that reproduces an information frame by returning positions of error-corrected bits to original bit positions.

Claims

1. A communication apparatus that comprises a transmitting unit and a receiving unit each of which has an error correction function, and transmits and receives respectively a information frame sufficiently longer than a codeword, wherein

the transmitting unit includes

a first interleaver that rearranges positions of bits in an information frame based on a predetermined rule;

an error correction encoder that carries out an error correction encoding to the information frame whose bit positions have been rearranged; and

a transmission signal generator that inserts error correction parities obtained by the encoding operation into predetermined positions of the information frame, thereby generating a transmission signal, and

the receiving unit includes

a reception signal extractor that receives the transmission signal and extracts a part corresponding to the information frame and the other part corresponding to the error correction parities, from the thus received transmission signal;

a second interleaver that rearranges positions of the bits in the information frame part based on the same rule as that of the first interleaver;

a decoder that corrects an error of bits rearranged by the second interleaver, based on the error correction parity part; and

a de-interleaver that reproduces an information frame by returning positions of the error-corrected bits to the original bit positions.

2. The communication apparatus according to claim 1, wherein the information frame is an Ethernet®

frame.

3. The communication apparatus according to claim 1, wherein a Reed-Solomon error correction system is used for carrying out the error correction encoding operation.

4. A communication apparatus that comprises a transmitting unit and a receiving unit each of which has an error correction function, and transmits and receives respectively an information frame that is sufficiently short to an extent that a burst error cannot be corrected satisfactorily when the information frame is interleaved as a single frame, wherein

the transmitting unit includes

a first frame generator that generates a frame sufficiently longer than a codeword, by combining a plurality of information frames;

a first interleaver that rearranges positions of bits in the frame generated by the first frame generator, based on a predetermined rule;

an error correction encoder that carries out an error correction encoding to the frame whose bit positions have been rearranged; and

a transmission signal generator that inserts error correction parities obtained by the encoding operation, into predetermined positions of the information frame, and

the receiving unit includes

a reception signal extractor that receives the transmission signal and extracts a part corresponding to the information frame and the other part corresponding to the error correction parities, from the thus received transmission signal;

a second frame generator that generates a frame sufficiently longer than a codeword, by combining a plurality of information frames;

a second interleaver that rearranges positions of bits in the frame generated by the second frame generator, based on the same rule as that used by the first interleaver;

a decoder that corrects an error of bits rearranged by the second interleaver, based on the error correction parity part;

a de-interleaver that returns positions of the error-corrected bits to the original bit positions; and

a frame divider that divides the error-corrected frame obtained by the de-interleaver, into a plurality of the original information frames.

5. The communication apparatus according to claim 4, wherein the information frame is an Ethernet®

frame.

6. The communication apparatus according to claim 4, wherein a Reed-Solomon error correction system is used for carrying out the error correction encoding operation.

7. A transmitter that transmits an information frame sufficiently longer than a codeword, the transmitter comprising:

an interleaver that rearranges positions of bits in an information frame based on a predetermined rule;

an error correction encoder that carries out an error correction encoding to the information frame whose bit positions have been rearranged; and

a transmission signal generator that inserts error correction parities obtained by encoding into predetermined positions in the information frame, thereby generating a transmission signal.

8. A transmitter that transmits an information frame that is sufficiently short to an extent that a burst error cannot be corrected satisfactorily when the information frame is interleaved as a single frame, the transmitter comprising:

a frame generator that generates a frame sufficiently longer than a codeword, by combining a plurality of information frames;

an interleaver that rearranges positions of bits in the frame generated by the frame generator, based on a predetermined rule;

an error correction encoder that carries out an error correction encoding to the frame whose bit positions have been rearranged; and

a transmission signal generator that inserts error correction parities obtained by the encoding operation, into predetermined positions of the information frame.

9. A receiver that has an error correction function, and receives an information frame sufficiently longer than a codeword, the receiver comprising:

a reception signal extractor that extracts a part corresponding to an information frame and a part corresponding to an error correction parity, from a reception signal;

an interleaver that rearranges positions of the bits in the information frame part, based on the same rule as that used at a transmitter side;

a decoder that corrects an error of bits rearranged by the interleaver, based on the error correction parity part; and

a de-interleaver that reproduces an information frame by returning positions of the error-corrected bits to the original bit positions.

10. A receiver that has an error correction function, and receives an information frame that is sufficiently short to an extent that a burst error cannot be corrected satisfactorily when the information frame is interleaved as a single frame, the receiver comprising:

a reception signal extractor that extracts a part corresponding to an information frame and a part corresponding to a plurality of error correction parities, from a reception signal;

a frame generator that generates a frame sufficiently longer than a codeword, by combining a plurality of information frames;

an interleaver that rearranges positions of bits in the frame generated by the frame generator, based on the same rule as that used at a transmitter side;

a decoder that corrects an error of bits rearranged by the interleaver, based on the error correction parity part;

a de-interleaver that returns positions of the error-corrected bits to the original bit positions; and

a frame divider that divides the error-corrected frame obtained by the de-interleaver, into a plurality of original information frames.

11. An error-correction optical communication system that comprises a transmitting unit and a receiving unit each of which has an error correction function, and transmits and receives respectively a information frame sufficiently longer than a codeword, wherein

the transmitting unit includes

a first interleaver that rearranges positions of bits in an information frame based on a predetermined rule;

an error correction encoder that carries out an error correction encoding to the information frame whose bit positions have been rearranged; and

a transmission signal generator that inserts error correction parities obtained by the encoding operation into predetermined positions of the information frame, thereby generating a transmission signal, and

the receiving unit includes

a reception signal extractor that receives the transmission signal and extracts a part corresponding to the information frame and the other part corresponding to the error correction parities, from the thus received transmission signal;

a second interleaver that rearranges positions of the bits in the information frame part based on the same rule as that of the first interleaver;

a decoder that corrects an error of bits rearranged by the second interleaver, based on the error correction parity part; and

a de-interleaver that reproduces an information frame by returning positions of the error-corrected bits to the original bit positions.

12. The error-correction optical communication system according to claim 11, wherein the information frame is an Ethernet®

frame.

13. The error-correction optical communication system according to claim 11, wherein a Reed-Solomon error correction system is used for carrying out the error correction encoding operation.

14. An error-correction optical communication system that comprises a transmitting unit and a receiving unit each of which has an error correction function, and transmits and receives respectively an information frame that is sufficiently short to an extent that a burst error cannot be corrected satisfactorily when the information frame is interleaved as a single frame, wherein

the transmitting unit includes

a first frame generator that generates a frame sufficiently longer than a codeword, by combining a plurality of information frames;

a first interleaver that rearranges positions of bits in the frame generated by the first frame generator, based on a predetermined rule;

an error correction encoder that carries out an error correction encoding to the frame of whose bit positions have been rearranged; and

a transmission signal generator that inserts error correction parities obtained by the encoding operation, into predetermined positions of the information frame, and

the receiving unit includes

a reception signal extractor that receives the transmission signal and extracts a part corresponding to the information frame and the other part corresponding to the error correction parities, from the thus received transmission signal;

a second frame generator that generates a frame sufficiently longer than a codeword, by combining a plurality of information frames;

a second interleaver that rearranges positions of bits in the frame generated by the second frame generator, based on the same rule as that used by the first interleaver;

a decoder that corrects an error of bits rearranged by the second interleaver, based on the error correction parity part;

a de-interleaver that returns positions of the error-corrected bits to the original bit positions; and

a frame divider that divides the error-corrected frame obtained by the de-interleaver, into a plurality of the original information frames.

15. The error-correction optical communication system according to claim 14, wherein the information frame is an Ethernet®

frame.

16. The error-correction optical communication system according to claim 14, wherein a Reed-Solomon error correction system is used for carrying out the error correction encoding operation.

17. A communication apparatus that comprises a transmitting unit and a receiving unit each of which has an error correction function, and transmits and receives respectively an information frame sufficiently longer than a codeword, wherein

the transmitting unit includes

a first interleaver that rearranges positions of bits in an information frame based on a predetermined rule;

a first error correction encoder that carries out an error correction encoding using an outer code to the information frame whose bit positions have been rearranged;

a second interleaver that rearranges bit positions of the output of the first error correction encoder based on a predetermined rule;

a second error correction encoder that carries out an error correction encoding using an inner code to the output of the second interleaver; and

a transmission signal generator that inserts a first error correction parity obtained by the first error correction encoding and a second error correction parity obtained by the second error correction encoding into predetermined positions of the information frame, thereby generating a transmission signal, and

the receiving unit includes

a reception signal extractor that receives the transmission signal, and extracts a part corresponding to the information frame, a part corresponding to the first error correction parity, and a part corresponding to the second error correction parity, from the thus received transmission signal;

a third interleaver that rearranges positions of the bits in the information frame part based on the same rule as that of the first interleaver;

a first adder that inserts a first error correction parity extracted by the reception signal extractor into the signals rearranged by the third interleaver;

a fourth interleaver that rearranges the output of the first adder based on the same rule as that of the second interleaver;

a second adder that inserts a second error correction parity extracted by the reception signal extractor into the signals rearranged by the fourth interleaver;

a first decoder that corrects an error of the output of the second adder, using the second error correction parity included in the processed output;

a first de-interleaver that rearranges the signals of which error is corrected by the first decoder, in the order opposite to that of the rearrangement executed by the second interleaver;

a second decoder that corrects an error of the output of the first de-interleaver, using the first error correction parity included in the processed output; and

the second de-interleaver that reproduces an information frame by returning positions of the error-corrected bits to the original bit positions by rearranging the signals of which error is corrected by the output of the second decoder, in the order opposite to that of the rearrangement executed by the first interleaver.

18. The communication apparatus according to claim 17, wherein a Reed-Solomon error correction system is used for carrying out the error correction encoding operation.

19. The communication apparatus according to claim 17, wherein the communication apparatus employs a junction code including two or more codewords for the error correction encoding.

20. The communication apparatus according to claim 17, wherein the communication apparatus employs a product code including two or more codewords for the error correction encoding.

21. The communication apparatus according to claim 17, wherein the information frame is an Ethernet®

frame.

22. A communication apparatus that comprises a transmitting unit and a receiving unit each of which has an error correction function, and transmits and receives respectively an information frame that is sufficiently short to an extent that a burst error cannot be corrected satisfactorily when the information frame is interleaved as a single frame, wherein

the transmitting unit includes

a first frame generator that generates a frame sufficiently longer than a codeword by combining a plurality of information frames;

a first interleaver that rearranges positions of bits in an information frame generated by the first frame generator, based on a predetermined rule;

a first error correction encoder that carries out an error correction encoding using an outer code to the information frame whose bit positions have been rearranged;

a second interleaver that rearranges bit positions of the output of the first error correction encoder based on a predetermined rule;

a second error correction encoder that carries out an error correction encoding using an inner code to the output of the second interleaver; and

a transmission signal generator that inserts a first error correction parity obtained by the first error correction encoding and a second error correction parity obtained by the second error correction encoding into predetermined positions of the information frame, thereby generating a transmission signal, and

the receiving unit includes

a reception signal extractor that receives the transmission signal, and extracts a part corresponding to the information frame, a part corresponding to the first error correction parity, and a part corresponding to the second error correction parity, from the thus received transmission signal;

a second frame generator that generates a frame sufficiently longer than a codeword by combining a plurality of information frames;

a third interleaver that rearranges positions of the bits in the information frame generated by the second frame generator, based on the same rule as that of the first interleaver;

a first adder that inserts a first error correction parity extracted by the reception signal extractor into the signals rearranged by the third interleaver;

a fourth interleaver that rearranges the output of the first adder based on the same rule as that of the second interleaver;

a second adder that inserts a second error correction parity extracted by the reception signal extractor into the signals rearranged by the fourth interleaver;

a first decoder that corrects an error of the output of the second adder, using the second error correction parity included in the processed output;

a first de-interleaver that rearranges the signals of which error is corrected by the first decoder, in the order opposite to that of the rearrangement executed by the second interleaver;

a second decoder that corrects an error of the output of the first de-interleaver, using the first error correction parity included in the processed output; and

a second de-interleaver that reproduces an information frame by returning positions of the error-corrected bits to the original bit positions by rearranging the signals of which error is corrected by the output of the second decoder, in the order opposite to that of the rearrangement executed by the first interleaver.

23. The communication apparatus according to claim 22, wherein a Reed-Solomon error correction system is used for carrying out the error correction encoding operation.

24. The communication apparatus according to claim 22, wherein the communication apparatus employs a junction code including two or more codewords for the error correction encoding.

25. The communication apparatus according to claim 22, wherein the communication apparatus employs a product code including two or more codewords for the error correction encoding.

26. The communication apparatus according to claim 22, wherein the information frame is an Ethernet®

frame.

27. A transmitter that transmits an information frame sufficiently longer than a codeword, the transmitter comprising:

a first interleaver that rearranges positions of bits in an information frame based on a predetermined rule;

a first error correction encoder that carries out an error correction encoding using an outer code to the information frame whose bit positions have been rearranged;

a second interleaver that rearranges bit positions of the output of the first error correction encoder based on a predetermined rule;

a second error correction encoder that carries out an error correction encoding using an inner code to the output of the second interleaver; and

a transmission signal generator that inserts a first error correction parity obtained by the first error correction encoding and a second error correction parity obtained by the second error correction encoding into predetermined positions of the information frame, thereby generating a transmission signal.

28. A receiver that has an error correction function and that receives a signal transmitted from the transmitter according to claim 27, the receiver comprising:

a reception signal extractor that receives the transmission signal, and extracts a part corresponding to the information frame, a part corresponding to the first error correction parity, and a part corresponding to the second error correction parity, from the thus received transmission signal;

a third interleaver that rearranges positions of the bits in the information frame, based on the same rule as that of the first interleaver;

a first adder that inserts a first error correction parity extracted by the reception signal extractor into the signals rearranged by the third interleaver;

a fourth interleaver that rearranges the output of the first adder based on the same rule as that of the second interleaver;

a second adder that inserts a second error correction parity extracted by the reception signal extractor into the signals rearranged by the fourth interleaver;

a first decoder that corrects an error of the output of the second adder, using the second error correction parity included in the processed output;

a first de-interleaver that rearranges the signals of which error is corrected by the first decoder, in the order opposite to that of the rearrangement executed by the second interleaver;

a second decoder that corrects an error of the output of the first de-interleaver, using the first error correction parity included in the processed output; and

a second de-interleaver that reproduces an information frame by returning positions of the error-corrected bits to the original bit positions by rearranging the signals of which error is corrected by the output of the second decoder, in the order opposite to that of the rearrangement executed by the first interleaver.

29. A transmitter that transmits an information frame that is sufficiently short to an extent that a burst error cannot be corrected satisfactorily when the information frame is interleaved as a single frame, the transmitter comprising:

a first frame generator that generates a frame sufficiently longer than a codeword by combining a plurality of information frames;

a first interleaver that rearranges positions of bits in an information frame generated by the first frame generator, based on a predetermined rule;

a first error correction encoder that carries out an error correction encoding using an outer code to the information frame whose bit positions have been rearranged;

a second interleaver that rearranges bit positions of the output of the first error correction encoder based on a predetermined rule;

a second error correction encoder that carries out an error correction encoding using an inner code to the output of the second interleaver; and

a transmission signal generator that inserts a first error correction parity obtained by the first error correction encoding and a second error correction parity obtained by the second error correction encoding into predetermined positions of the information frame, thereby generating a transmission signal.

30. A receiver that has an error correction function and that receives a signal transmitted from the transmitter according to claim 29, the receiver comprising:

a reception signal extractor that receives the transmission signal, and extracts a part corresponding to the information frame, a part corresponding to the first error correction parity, and a part corresponding to the second error correction parity, from the thus received transmission signal;

a second frame generator that generates a frame sufficiently longer than a codeword by combining a plurality of information frames;

a third interleaver that rearranges positions of the bits in the information frame generated by the second frame generator, based on the same rule as that of the first interleaver;

a first adder that inserts a first error correction parity extracted by the reception signal extractor into the signals rearranged by the third interleaver;

a fourth interleaver that rearranges the output of the first adder based on the same rule as that of the second interleaver;

a second adder that inserts a second error correction parity extracted by the reception signal extractor into the signals rearranged by the fourth interleaver;

a first decoder that corrects an error of the output of the second adder, using the second error correction parity included in the processed output;

a first de-interleaver that rearranges the signals of which error is corrected by the first decoder, in the order opposite to that of the rearrangement executed by the second interleaver;

a second decoder that corrects an error of the output of the first de-interleaver, using the first error correction parity included in the processed output; and

a second de-interleaver that reproduces an information frame by returning positions of the error-corrected bits to the original bit positions by rearranging the signals of which error is corrected by the output of the second decoder, in the order opposite to that of the rearrangement executed by the first interleaver.

31. An error correction optical communication system that has an error correction function, and transmits and receives respectively an information frame sufficiently longer than a codeword, wherein

a communication apparatus at an information frame transmission side includes

a first interleaver that rearranges positions of bits in an information frame based on a predetermined rule;

a first error correction encoder that carries out an error correction encoding using an outer code to the information frame whose bit positions have been rearranged;

a second interleaver that rearranges bit positions of the output of the first error correction encoder based on a predetermined rule;

a second error correction encoder that carries out an error correction encoding using an inner code to the output of the second interleaver; and

a transmission signal generator that inserts a first error correction parity obtained by the first error correction encoding and a second error correction parity obtained by the second error correction encoding into predetermined positions of the information frame, thereby generating a transmission signal, and

a communication apparatus at an information frame reception side includes

a reception signal extractor that receives the transmission signal, and extracts a part corresponding to the information frame, a part corresponding to the first error correction parity, and a part corresponding to the second error correction parity, from the thus received transmission signal;

a third interleaver that rearranges positions of the bits in the information frame part based on the same rule as that of the first interleaver;

a first adder that inserts a first error correction parity extracted by the reception signal extractor into the signals rearranged by the third interleaver;

a fourth interleaver that rearranges the output of the first adder based on the same rule as that of the second interleaver;

a second adder that inserts a second error correction parity extracted by the reception signal extractor into the signals rearranged by the fourth interleaver;

a first decoder that corrects an error of the output of the second adder, using the second error correction parity included in the processed output;

a first de-interleaver that rearranges the signals of which error is corrected by the first decoder, in the order opposite to that of the rearrangement executed by the second interleaver;

a second decoder that corrects an error of the output of the first de-interleaver, using the first error correction parity included in the processed output; and

a second de-interleaver that reproduces an information frame by returning positions of the error-corrected bits to the original bit positions by rearranging the signals of which error is corrected by the output of the second decoder, in the order opposite to that of the rearrangement executed by the first interleaver.

32. The error-correction optical communication system according to claim 31, wherein a Reed-Solomon error correction system is used for carrying out the error correction encoding operation.

33. The communication apparatus according to claim 31, wherein the communication apparatus employs a junction code including two or more codewords for the error correction encoding.

34. The communication apparatus according to claim 31, wherein the communication apparatus employs a product code including two or more codewords for the error correction encoding.

35. The communication apparatus according to claim 31, wherein the information frame is an Ethernet®

frame.

36. An error correction optical communication system that has an error correction function, and transmits and receives respectively an information frame that is sufficiently short to an extent that a burst error cannot be corrected satisfactorily when the information frame is interleaved as a single frame, wherein

a communication apparatus at an information frame transmission side includes

a first frame generator that generates a frame sufficiently longer than a codeword by combining a plurality of information frames;

a first interleaver that rearranges positions of bits in an information frame generated by the first frame generator, based on a predetermined rule;

a first error correction encoder that carries out an error correction encoding using an outer code to the information frame whose bit positions have been rearranged;

a second interleaver that rearranges bit positions of the output of the first error correction encoder based on a predetermined rule;

a second error correction encoder that carries out an error correction encoding using an inner code to the output of the second interleaver; and

a transmission signal generator that inserts a first error correction parity obtained by the first error correction encoding and a second error correction parity obtained by the second error correction encoding into predetermined positions of the information frame, thereby generating a transmission signal, and

a communication apparatus at an information frame reception side includes

a reception signal extractor that receives the transmission signal, and extracts a part corresponding to the information frame, a part corresponding to the first error correction parity, and a part corresponding to the second error correction parity, from the thus received transmission signal;

a second frame generator that generates a frame sufficiently longer than a codeword by combining a plurality of information frames;

a third interleaver that rearranges positions of the bits in the information frame generated by the second frame generator, based on the same rule as that of the first interleaver;

a first adder that inserts a first error correction parity extracted by the reception signal extractor into the signals rearranged by the third interleaver;

a fourth interleaver that rearranges the output of the first adder based on the same rule as that of the second interleaver;

a second adder that inserts a second error correction parity extracted by the reception signal extractor into the signals rearranged by the fourth interleaver;

a first decoder that corrects an error of the output of the second adder, using the second error correction parity included in the processed output;

a first de-interleaver that rearranges the signals of which error is corrected by the first decoder, in the order opposite to that of the rearrangement executed by the second interleaver;

a second decoder that corrects an error of the output of the first de-interleaver, using the first error correction parity included in the processed output; and

a second de-interleaver that reproduces an information frame by returning positions of the error-corrected bits to the original bit positions by rearranging the signals of which error is corrected by the output of the second decoder, in the order opposite to that of the rearrangement executed by the first interleaver.

37. The error-correction optical communication system according to claim 36, wherein a Reed-Solomon error correction system is used for carrying out the error correction encoding operation.

38. The communication apparatus according to claim 36, wherein the communication apparatus employs a junction code including two or more codewords for the error correction encoding.

39. The communication apparatus according to claim 36, wherein the communication apparatus employs a product code including two or more codewords for the error correction encoding.

40. The communication apparatus according to claim 36, wherein the information frame is an Ethernet®

frame.