Data communication system using an adaptive hybrid ARQ scheme.

摘要

In order to combine an ARQ system and an FEC system, an error correction code is inserted between an error detection code for a variable-length ARQ frame and a frame boundary flag pattern. Information to be transmitted is divided into blocks having a suitable length by a block divider (11) in accordance with a line quality judged by a line quality judger (37), and then subjected to a framing operation by an information frame preparer (12). The information subjected to the framing operation is attached with a CRC code by a CRC code generation/application circuit (16), subjected by a zero insertion circuit (18) to an insertion of a suitable number of zero bits therein to provide a distinguished frame boundary with a flag, and the transmitted.