| 摘要 |
First two dimensional plane is defined by phase of modulated signal and first vector corresponding to first signal point to be decided is defined. Then, first inner product by the first vector and second vector corresponding to last decided signal point is made and the second vector is transformed into third vector which is ninety degrees advanced. Next, second inner product of the first vector and third vector is made and the region of the first signal is decided in the two dimensional plane in accordance with the first and second inner product.
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