To make the circuit easily understandable, a decision-making circuit may also be inserted at the 2 nd stage of detection. If the bit rate is a sub-multiple of the carrier frequency, then the bit clock regeneration is simplified. In the next stage of demodulation, the bit clock rate is needed at the detector circuit to produce the original binary message signal. The base band signal which is band limited is obtained and this signal is used to regenerate the binary message bit stream. The diagram is as follows.īy recovering the band-limited message signal, with the help of the mixer circuit and the band pass filter, the first stage of demodulation gets completed. The block diagram of BPSK demodulator consists of a mixer with local oscillator circuit, a bandpass filter, a two-input detector circuit. The output sine wave of the modulator will be the direct input carrier or the inverted (180° phase shifted) input carrier, which is a function of the data signal. For a zero binary input, the phase will be 0° and for a high input, the phase reversal is of 180°.įollowing is the diagrammatic representation of BPSK Modulated output wave along with its given input. The modulation of BPSK is done using a balance modulator, which multiplies the two signals applied at the input. Following is the diagrammatic representation. The block diagram of Binary Phase Shift Keying consists of the balance modulator which has the carrier sine wave as one input and the binary sequence as the other input. ![]() PSK technique is widely used for wireless LANs, bio-metric, contactless operations, along with RFID and Bluetooth communications. If this kind of techniques are further extended, PSK can be done by eight or sixteen values also, depending upon the requirement. Phase Shift Keying PSK P S K is the digital modulation technique in which the phase of the carrier signal is changed by varying the sine and cosine inputs at a particular time. This is the phase shift keying technique, in which the sine wave carrier takes four phase reversals such as 0°, 90°, 180°, and 270°. In this technique, the sine wave carrier takes two phase reversals such as 0° and 180°.īPSK is basically a Double Side Band Suppressed Carrier (DSBSC) modulation scheme, for message being the digital information. This is also called as 2-phase PSK or Phase Reversal Keying. ![]() They are − Binary Phase Shift Keying (BPSK) Most digital radio modulation types are based on either Phase Shift Keying (PSK) or Frequency Shift Keying (FSK). PSK is of two types, depending upon the phases the signal gets shifted. Phase Shift Keying (PSK) is the digital modulation technique in which the phase of the carrier signal is changed by varying the sine and cosine inputs at a particular time. This lab will have you create and deomodulate (in the presence of noise) a simple amplitude shift-keyed (ASK), frequency shift-keyed (FSK), and phase shift-keyed (PSK) waveform. Phase Shift Keying (PSK) is the digital modulation technique in which the phase of the carrier signal is changed by varying the sine and cosine inputs at a particular time. EE354: Lab 13-ASK, FSK, and PSK Demodulation.
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