This video explains the Generation of Binary Phase Shift Keying Modulation (BPSK). Block Diagram for the generation (Production) of BPSK has been given to clear the basics. You will get the Basic introduction, Definition and Waveform of Binary Phase Shift Keying Modulation (BPSK). Here we will also discuss the derivation of the Binary Phase Shift Keying (BPSK Modulation) equations. The conceptual difference between digital modulation and analog modulation is also explained here.
You will also know how the Analog Phase Modulation (PM) and Phase Shift Keying (PSK) are different from the Binary Phase Shift Keying (BPSK Modulation).
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Phase Shift Keying (PSK)
In phase shift keying, phase of the carrier wave (analog) is varied as per the digital input signal. Phase shift keying is analogous to Phase Modulation (analogue phase modulation).
The phase shift keying is very much similar to Phase Modulation (PM), because in both of these modulation techniques, the phase of the carrier wave is changed, according to the instantaneous value of the modulating signal. The difference is only of the nature of the modulating signal. In phase modulation, the modulating signal is analog but in case of phase shift keying, modulating signal is of digital nature.
The carrier wave is of analogue kind in both of these modulation techniques.
Now we will understand the basic concept of Phase Shift Keying (PSK), with the help of an example shown in the image given below-
Phase Shift Keying, PSK, PSK Waveform, Phase Shift Keying (PSK) Waveform
Phase Shift Keying (PSK) Waveform
The Image contains three parts-
#The digital input signal (011001)
#The sinusoidal carrier wave (analog)
#PSK waveform
Now let's understand the basic concept, how the phase shift keying takes place-
In Phase Shift Keying (PSK), the phase of the carrier wave is changed (switched) according to the digital input signal. Therefore the information of this digital input signal is present in the phase shift variations of the carrier wave.
Now observe the image carefully-
Here we will Try to understand the concept of PSK with the help of an example given in this image.
Notice here that, whenever the digital input changes the bit (either from '0' to '1' or from '1' to '0'), a phase shift of 180 degrees (π) takes place in the carrier wave. But no phase change occurs when there is no change in the digital bit.
In this image, observe; the phase shift of 180 degrees takes place in the carrier wave at three places. At all these three places, the digital input bit has either change from '0' to '1' or from '1' to '0'. No phase shift takes place when two two successive (back to back) 1's or two successive 0's are to be transmitted (as per the image). Hence we get the PSK waveform in this way.
This was all about three kinds of digital modulation techniques, amplitude shift keying, frequency shift keying and phase shift keying.
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