APPARATUS AND METHOD FOR QUADRATURE PHASE SHIFT KEYING

摘要

A method and apparatus for quadrature phase shift keying (QPSK) are provided. According to the apparatus and method, the symbol error probability performance of a conventional QPSK method can be improved by a maximum of 3dB, and when the same symbol error rate (SER) as that of the conventional method is obtained, the power consumption can be reduced to half that required by the conventional method. The apparatus includes: an oscillator generating a sine wave signal; an IQ sine wave signal generation unit adjusting the phase of the sine wave signal based on I channel data and Q channel data, thereby generating an I channel sine wave signal and a Q channel sine wave signal such that a signal obtained by mixing a first signal and a second signal satisfies the condition that the mixed signal has a phase on a signal constellation diagram corresponding to the I and Q channel data, in which the first signal is obtained by applying the I channel data to the I channel sine wave signal and the second signal obtained by applying the Q channel data to the Q channel sine wave signal; and a transmission signal generation unit generating a transmission signal corresponding to the I and Q channel data, by respectively applying the I channel data and the Q channel data to the I channel sine wave signal and the Q channel sine wave signal.