TURBO-CODER/DECODER AND TURBO-CODING/DECODING METHOD

摘要

A turbo-code coder, etc., used for satellite communication, etc. Coded data (D152-1) are obtained by performing convolution algorithm on input data (D151) by means of a coding circuit (151-1). All input data (D153) including the termination bit at the coding circuit (151-1) are supplied to a series circuit of interleavers (152-1) to (152-(m-1)). Coded data (D152-2) to (D152-m) are obtained by performing convolution algorithm on the output data of the interleaves (152-1) to (152-(m-1)) by means of coding circuits (151-2) to (151-m), respectively. Each interleaver performs interleaving so that the coding circuits (151-2) to (151-m) may also simultaneously terminate each input data when the coding circuit (151-1) terminates each input data on the basis of a plurality of parts obtained by dividing each input data in accordance with their positions. Therefore, it becomes unnecessary to provide any termination circuit to the coding circuits (151-2) to (D151-m). In addition, a ROM, etc., for storing substitutional positional information becomes unnecessary, because each interleaver finds substitutional positions by calculation.