Communication apparatus, transmitter, receiver, and error correction optical communication system

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.

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.