Patent ID: 8358717

Claim:
A binary phase shift key (BPSK) demodulating device, the device comprising: the BPSK demodulating device is configured to receive a BPSK signal; an I signal generator to generate an in-phase (I) signal from the received BPSK signal; a Q signal generator to generate a quadrature-phase (Q) signal from the received BPSK signal, and wherein the Q signal generator uses at least one of a plurality of phase shifters and modules having a function of phase shift; an oscillator to generate a first signal to separate a baseband signal from the received BPSK signal, and wherein the I signal and the Q signal are configure to be generated using the first signal from the oscillator, wherein the Q signal is further configure to be generated using at least the first signal from the oscillator and the at least one of the plurality of phase shifter and the modules having the function of phase shift, and wherein the Q signal generator further comprises: a first phase shifter to generate a second signal by shifting the first signal generated from the oscillator by a first shift angle; a second phase shifter to generate a third signal by shifting the received BPSK signal by the second phase angle; a second mixer to multiply the second signal with the third signal; and a second integrator to integrate a signal generated from the second mixer; and a determining unit to determine a transmission phase angle based on the I signal and the Q signal, wherein the determining unit generates a determination area using a rotational transformation of Equation 5 as [ X Y ] = [ cos ⁡ ( π / 4 ) sin ⁡ ( π / 4 ) - sin ⁡ ( π / 4 ) cos ⁡ ( π / 4 ) ] ⁡ [ I Q ] . [ Equation ⁢ ⁢ 5 ]