Loss correction encoding device and loss correction encoding method

A coding apparatus that is applied to a communication apparatus that performs packet communication, comprising:

• an arranging section that arranges information data included in a plurality of information packets according to constraint length Kmax and coding rate (q−1)/q of a parity check polynomial of equation 1 of a low-density parity-check convolutional code;
• an erasure correction encoding section that applies erasure correction coding to arranged information data using the parity check polynomial and generates first parity packets to output the first parity packets;
• and
• an error correction coding section that applies error correction coding to the information data and the output first parity packets to generate second parity packets,
• wherein the arranging section arranges the information data to make, a bit sequence which is decided based on the constraint length Kmax and the coding rate (q−1)/q in the arranged information data, be formed with bits respectively included in the different information packets,
• (Da#k,1,1+Da#k,1,2+ . . . +Da#k,1,L1k+1)X1(D)+(Da#k,2,1+Da#k,2,2+ . . . +Da#k,2,L2k+1)X2(D)+ . . .
• +(Da#k,q-1,1Da#k,q-1,2+ . . . +Da#k,q-1,Lq-1k+1)Xq-1(D)+(Db#k,1+Db#k,2+ . . . Db#k,Lk+1)P(D)=0 (Equation 1)
• where D is a delay operator, and, if a#k,x,y and b#k,y (k=1, 2, 3, . . . , g) each are an order of the parity check polynomial of equation 1 and a maximum value (maximum order) of a#k,x,y and b#k,y is amax, constraint length Kmax=amax+1.