| 摘要 |
PROBLEM TO BE SOLVED: To simplify the configuration of an inverse spread section with respect to the CDMA receiver that receives and demodulates a direct spread code division multiple access CDMA signal by a quadrature phase shift keying QPSK spread modulation. SOLUTION: An inverse spread section 10 where a direct spread CDMA signal by QPSK spread modulation is received by an antenna 1, orthogonally demodulated by demodulators 4,5 and a demodulation in-phase signal and a demodulation quadrature signal converted into digital signals by A/D converters 8,9 are received to conduct inverse spread processing is provided with a selector section 13 that selects and outputs the demodulated in-phase signal and the demodulated quadrature signal, and inverted in-phase signal and inverted quadrature signal that are inverse of the demodulated in-phase signal and the demodulated quadrature signal as the in-phase signal or the quadrature signal according to the inverse spread code for in-phase or quadrature phase. |
