PSK星座对象（constellation.cc）

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BPSK：

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();    }

QPSK：

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();    }

DQPSK:

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();    }

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