A phase-shift keying (PSK) receiver includes a carrier wave generator generating a carrier wave, an extracting unit extracting an in-phase component I and a quadrature component Q from a received signal on the basis of the carrier wave and the received signal, a comparator comparing the in-phase component I and the quadrature component Q extracted from the received signal to a predetermined threshold values respectively and acquiring 1-bit digital signals corresponding to the in-phase component I and the quadrature component Q respectively; and a BPSK demodulator demodulating the received signal using a binary phase-shift keying (BPSK) scheme on the basis of positional relationship on I-Q constellation between the 1-bit digital signals corresponding to the in-phase component I and the quadrature component Q acquired by the comparator.