Channel coding method using concatenated code structure and apparatus therefor
Disclosed herein is a concatenated code encoding method for improving a turbo code. The concatenated code encoding method of the present disclosure includes encoding an input signal based on a repetition-accumulation (RA) code as an outer code, adding a tail bit to the encoded input signal, and encoding the encoded input signal based on the a turbo code. The concatenated code encoding method may further include interleaving the encoded input signal after application of the outer code.
1. A method of transmitting data encoded by a concatenated code, the method comprising:
generating a first codeword from an input signal using a repetition-accumulation (RA) code as an outer code;
adding at least one tail bit to a last region of the generated first codeword;
generating a second codeword from the generated first codeword and the added tail bit by using a turbo code as an inner code, the generated second codeword comprising a plurality of regions encoded in reverse order of the plurality of regions; and
transmitting the encoded data,
wherein the tail bit is added to a last of the plurality of regions.
2. The method according to claim 1 , further comprising performing interleaving on the generated first codeword and the added tail bit.
3. The method according to claim 2 , wherein the interleaving is performed on the generated first codeword and the added tail bit.
4. The method of claim 1 , wherein generating the second codeword comprises:
acquiring a start state of an N+1th of the plurality of regions by encoding the N+1th region, N being a natural number; and
encoding the N+1th of the plurality of regions using the acquired start state as an end state of an Nth of the plurality of regions.
5. A method of receiving data encoded by a concatenated code, the method comprising:
receiving the encoded data corresponding to a plurality of regions of a second codeword, at least one tail bit is added to a last of the plurality of regions;
decoding the last of the plurality of regions to obtain the tail bit;
decoding a first codeword from the plurality of regions based on a turbo code by using the tail bit; and
decoding an input signal from the decoded first codeword based on a repetition-accumulation (RA) code, the decoding performed in reverse order of the plurality of regions.
6. The method of claim 5 , wherein decoding the first codeword comprises:
acquiring a start state of an N+1th region of the plurality of regions by decoding the N+1th region, N being a natural number; and
decoding the N+1th of the plurality of regions using the acquired start state as an end state of an Nth of the plurality of regions.
7. The method of claim 5 , further comprising performing deinterleaving on the decoded first codeword.
8. The method of claim 7 , where the deinterleaving is performed on the decoded first codeword and the tail bit.