Patent ID: 8571123

Claim:
A method of mapping transmission data to a symbol in a symbol mapping apparatus, the method comprising: encoding the transmission data to output a plurality of information bits and a plurality of redundancy bits; mapping the information bits and the redundancy bits to symbols according to a first mapping scheme at a first transmission; and mapping the information bits and the redundancy bits to the symbols according to a second mapping scheme at a second transmission, the second mapping scheme being different from the first mapping scheme, wherein mapping the information bits and the redundancy bits to the symbols according to the first mapping scheme comprises: mapping the information bits to first bits of the symbols; and mapping the redundancy bits to second bits of the symbols, wherein mapping the information bits and the redundancy bits to the symbols according to the second mapping scheme comprises: mapping the information bits to the second bits of the symbols; and mapping the redundancy bits to the first bits of the symbols, and wherein the positional reliability of the first bits is higher than that of the second bits or the positional reliability of the first bits is lower than that of the second bits.