Method and system for transmitting and receiving signals

摘要

The present invention relates to methods of efficiently transmitting signals. In particular, the present invention applies LDPC encoder for encoding a data stream. After bit-interleaving the encoded data stream, a demultiplexer is applied for identifying a type of a demultiplexer according to a code rate and a modulation format and demultiplexing the bit-interleaved data stream according to the identified type by changing output order of the bit interleaved data stream. The demultiplexed data stream is then symbol mapped using the modulation format and then OFDM modulated.