COMMUNICATION DEVICE PEAK-POWER SUPPRESSING METHOD

摘要

PROBLEM TO BE SOLVED: To suppress peak power in the summed value of a signal transmitted simultaneously to plural users. SOLUTION: A modulation circuit 101 through a modulation circuit 104 modulate four user's transmission signals (using a basic slot, where a pilot symbol is periodically inserted into transmission data) or a control signal including a pilot signal and three user's transmission signals (using a basic slot, where a pilot symbol is not inserted into transmission data). A phase rotation circuit 105 through a phase rotation circuit 108 perform phase rotation of output signals of the modulation circuit 101 through the modulation circuit 104, according to the number of total users. An adding circuit I (109) adds the in-phase components of output signals of the circuit 105 through the circuit 108, and an adding circuit Q (110) adds the quadrature components of the output signals of the circuit 105 through the circuit 108. A radio part 115 modulates output signals of the adding circuits I (109) and Q (110) into radio frequency and further amplifiers it.