A base station apparatus, comprising: a downlink signal generation circuit (104_1, 104_2, 104_n) that is configured to generate a downlink signal including a first data signal for a first reception apparatus (402_1) mapped on a first set of subcarriers and a second data signal for a second reception apparatus (402_2) mapped on a second set of subcarriers; and a transmitter (109_A, 109_B, 111_A, 111_B) that is configured to transmit the downlink signal; the downlink signal generation circuit is further configured to determine whether to map Reference Signals for Phase Tracking, PT-RS (503, 603), to the first data signal based on a first modulation order of a first modulation scheme, configured for the first data signal and determines whether to map the PT-RS (503, 603) to the second data signal based on a second modulation order of a second modulation scheme configured for the second data signal, in a case where Binary Phase Shift Keying, BPSK, or Quadrature Phase Shift Keying, QPSK, is used as a modulation scheme, determine not to map the PT-RS (503, 603), and responsive to determining to map the PT-RS (503, 603), map first PT-RS (503, 603) to the first data signal for the first reception apparatus and map second PT-RS (503, 603) to the second data signal for the second reception apparatus, characterized in that a first correction coefficient of transmission power for the first PT-RS is associated with an insertion pattern of the first PT-RS (503, 603); and a second correction coefficient of transmission power for the second PT-RS is associated with an insertion pattern of the second PT-RS (503, 603). a downlink signal generation circuit (104_1, 104_2, 104_n) that is configured to generate a downlink signal including a first data signal for a first reception apparatus (402_1) mapped on a first set of subcarriers and a second data signal for a second reception apparatus (402_2) mapped on a second set of subcarriers; and a transmitter (109_A, 109_B, 111_A, 111_B) that is configured to transmit the downlink signal; the downlink signal generation circuit is further configured to determine whether to map Reference Signals for Phase Tracking, PT-RS (503, 603), to the first data signal based on a first modulation order of a first modulation scheme, configured for the first data signal and determines whether to map the PT-RS (503, 603) to the second data signal based on a second modulation order of a second modulation scheme configured for the second data signal, in a case where Binary Phase Shift Keying, BPSK, or Quadrature Phase Shift Keying, QPSK, is used as a modulation scheme, determine not to map the PT-RS (503, 603), and responsive to determining to map the PT-RS (503, 603), map first PT-RS (503, 603) to the first data signal for the first reception apparatus and map second PT-RS (503, 603) to the second data signal for the second reception apparatus, characterized in that a first correction coefficient of transmission power for the first PT-RS is associated with an insertion pattern of the first PT-RS (503, 603); and a second correction coefficient of transmission power for the second PT-RS is associated with an insertion pattern of the second PT-RS (503, 603).