Transmission apparatus and method, and reception apparatus and method

Abstract

An encoding method changes an encoding rate of an erasure correcting code. One cycle is defined as 12k bits (wherein k represents a natural number) which is an encoding output using LDPC-CC with an encoding rate of 1/2, and includes information and parity. From the one cycle, only the information is arranged in the output order of the encoding output to obtain 6k bit information X6i, X6i+1, X6i+2, X6i+3, X6i+4, X6i+5, . . . , X6(i+k−1) X6(i+k−1)+1, X6(i+k−1)+2, X6(i+k−1)+3, X6(i+k−1)+4, and X6(i+k−1)+5. Known information is inserted in 3k pieces of information (Xj) among the 6k bit information, so that when 3k pieces of mutually different j is divided by 3, there is a remainder of 0 regarding k pieces, there is a remainder of 1 regarding k pieces, and there is a remainder of 2 regarding k pieces, to thereby obtain the parity from the information containing the known information.

1 . A transmission apparatus comprising:
 a packet generator configured to generate a plurality of information packets from an input data sequence;   an interleaver configured to interleave the input data sequence within each of the plurality of information packets;   an encoder configured to perform an encoding processing for the plurality of interleaved information packets to generate a plurality of parity packets and output the plurality of interleaved information packets and the plurality of parity packets as a transmission data sequence;   a modulator configured to modulate the transmission data sequence using a predetermined modulation scheme to generate a modulated signal; and   a transmitter configured to transmit the modulated signal.   
     
     
         2 . The transmission apparatus according to  claim 1 , wherein the encoder further includes:
 an erasure correction encoder configured to perform an erasure correction encoding processing for the plurality of interleaved information packets to generate the plurality of parity packets; and   an error correcting encoder configured to perform an error correcting encoding processing for the plurality of interleaved information packets and the plurality of parity packets to generate a transmission data sequence.   
     
     
         3 . The transmission apparatus according to  claim 1 , wherein the encoder generates the plurality of parity packets using a low-density parity check coding scheme. 
     
     
         4 . A transmission method comprising:
 generating, by a processor, a plurality of information packets from an input data sequence;   interleaving the input data within each of the plurality of information packets;   performing an erasure correction encoding processing for the plurality of interleaved information packets to generate a plurality of parity packets as a transmission data sequence;   modulating the transmission data sequence using a predetermined modulation scheme to generate a modulated signal; and   transmitting the modulated signal.   
     
     
         5 . The transmission method according to  claim 5 , wherein
 the plurality of parity packets are generated by performing an erasure correction encoding processing for the plurality of interleaved information packets, and   the transmission data sequence is generated by performing an error correcting encoding processing for the plurality of interleaved information packets and the plurality of parity packets.   
     
     
         6 . The transmission method according to  claim 4 , wherein the erasure correction encoding processing generates the plurality of parity packets using a low-density parity check coding scheme. 
     
     
         7 . A reception apparatus comprising:
 a receiver configured to receive a modulated signal;   a de-modulator configured to de-modulate the received modulated signal using a predetermined modulation scheme to generate a de-modulated signal; and   a decoder configured to perform a decoding processing for the de-modulated signal to generate a plurality of information packets; and   a de-interleaver configured to de-interleave a data sequence within each of the plurality of information packets.   
     
     
         8 . The reception apparatus according to  claim 7 , wherein the decoder performs the decoding processing for the de-modulated signal using Belief Propagation. 
     
     
         9 . A reception method comprising:
 receiving, by a receiver, a modulated signal;   de-modulating the received modulated signal using a predetermined modulation scheme to generate a de-modulated signal; and   performing a decoding processing for the de-modulated signal to generate a plurality of information packets; and   de-interleaving a data sequence within each of the plurality of information packets.   
     
     
         10 . The reception method according to  claim 9 , wherein the de-modulated signal is de-modulated by using Belief Propagation.