PSK星座对象（constellation.cc）

constellation_bpsk::constellation_bpsk()
{
d_constellation.resize(2);
d_constellation[0] = gr_complex(-1, 0);
d_constellation[1] = gr_complex(1, 0);
d_rotational_symmetry = 2;
d_dimensionality = 1;
calc_arity();
}

constellation_qpsk::constellation_qpsk()
{
d_constellation.resize(4);
// Gray-coded
d_constellation[0] = gr_complex(-SQRT_TWO, -SQRT_TWO);
d_constellation[1] = gr_complex(SQRT_TWO, -SQRT_TWO);
d_constellation[2] = gr_complex(-SQRT_TWO, SQRT_TWO);
d_constellation[3] = gr_complex(SQRT_TWO, SQRT_TWO);

/*
d_constellation[0] = gr_complex(SQRT_TWO, SQRT_TWO);
d_constellation[1] = gr_complex(-SQRT_TWO, SQRT_TWO);
d_constellation[2] = gr_complex(SQRT_TWO, -SQRT_TWO);
d_constellation[3] = gr_complex(SQRT_TWO, -SQRT_TWO);
*/

d_pre_diff_code.resize(4);
d_pre_diff_code[0] = 0x0;
d_pre_diff_code[1] = 0x2;
d_pre_diff_code[2] = 0x3;
d_pre_diff_code[3] = 0x1;

d_rotational_symmetry = 4;
d_dimensionality = 1;
calc_arity();
}

constellation_dqpsk::constellation_dqpsk()
{
// This constellation is not gray coded, which allows
// us to use differential encodings (through diff_encode and
// diff_decode) on the symbols.
d_constellation.resize(4);
d_constellation[0] = gr_complex(+SQRT_TWO, +SQRT_TWO);
d_constellation[1] = gr_complex(-SQRT_TWO, +SQRT_TWO);
d_constellation[2] = gr_complex(-SQRT_TWO, -SQRT_TWO);
d_constellation[3] = gr_complex(+SQRT_TWO, -SQRT_TWO);

// Use this mapping to convert to gray code before diff enc.
d_pre_diff_code.resize(4);
d_pre_diff_code[0] = 0x0;
d_pre_diff_code[1] = 0x1;
d_pre_diff_code[2] = 0x3;
d_pre_diff_code[3] = 0x2;
d_apply_pre_diff_code = true;

d_rotational_symmetry = 4;
d_dimensionality = 1;
calc_arity();
}