Patent ID: 7111219

Claim:
A data reception apparatus comprising: a reception section that (i) receives data modulated and transmitted using a first constellation pattern, and (ii) receives all or a part of said data modulated and retransmitted using a second constellation pattern, and a demodulating section that demodulates said data, received in operation (i), using said first constellation pattern and demodulates said all or a part of said data, received in operation (ii), using said second constellation pattern, wherein: each of said first and second constellation patterns is a constellation for a 16 QAM modulation scheme, and said second constellation pattern is different from the first constellation pattern, with respect to a sequence of bits (i 1 q 1 i 2 q 2 ) in a symbol, by at least one of (a) exchanging the positions of the first bit i 1 and third bit i 2 as well as that of the second bit q 1 and fourth bit q 2 relative to one another and (b) inverting the third bit i 2 and fourth bit q 2 respectively.