| 摘要 |
PROBLEM TO BE SOLVED: To perform a low power consumption by reducing a scale of a circuit when an amplitude and a phase of a transmission signal are controlled to realize a transmission diversity. SOLUTION: When signals of I and Q of QPSK modulation signals are mapped on a phase flat surface, first sign (+ and -) is converted by a sign converter 60, and phase offset of magnification of 90 deg. is realized. Then, the amplitude is regulated by an amplitude regulator 61. Then, offset smaller than 90 deg. (e.g. fixed 45 deg. offset) is realized by a phase offset arithmetic unit 62. Since the phase offset of magnification of 90 deg. is realized by the sign conversion at a stage of the original data, a circuit constitution can be very simplified. The phase offset smaller than 90 deg. can be easily realized, and a circuit simplification and the low power consumption can be performed. |
