follows data block is transmitted by byte and inputted into the block interleaver from left to right column by column until the kth column with each column having mi bytes the rs encoding is performed by row and the verifying bytes are filled to the latter 240 k columns the encoded data is outputted from left to right column by column as the order of inputting until all 240 columns are finished the above rs encoding and the byte interleaving are undertaken based on physical logical channels the upper layer packages of the same physical logical channel are inputted into the byte interleaver in turn for byte interleaving and rs encoding the first byte of the 0 th column in the byte interleaver is defined as a start byte of the byte interleaver each output of the byte interleaver m1 u00d7 240 bytes are always mapped to a integer number of time slots to be transmitted in which the start byte of the byte interleaver is mapped to a start point of a certain time slot to be transmitted after the rs encoding and byte interleaving the transmission data is transmitted based on the rule of bit of higher order having higher priority for transmitting and each byte is mapped to form a 8 bit stream to be transmitted into the ldpc encoder the first byte of the 0 th column in the byte.