This is due to the fact that data are represented by 2 carrier phase shifts with respect to the main carrier frequency
The figure-3 depicts 2FSK power spectrum and 4FSK power spectrum.Īs shown there are 2 carrier peaks in 2FSK modulation while 4 carrier peaks in 4FSK modulation. Where in 4 different Δf as shown in table-2 are used to represent 4 diferent binary dibits in 4FSK to Similar to the equations mentioned above 4FSK modulation can also be expressed using following equation. The table-1 below mentions mapping between input and corresponding output used in 2FSK modulation.Īs mentioned each symbol carries 1 bit of information.ĢFSK is same as FSK modulation technique.Ĭoding (carrier+Δf value used to map input dibits) As shown bits or binary digits (0 or 1) are used as inputs while symbols are generated as Respect to the reference carrier frequency used in the FSK modulator and FSK demodulator design.įigure-1 depicts 2FSK modulator block. In the FSK demodulator, data are demodulated from symbols after distinguishing different frequency deviation with It is one of the digital modulation technique in which different frequencies represent different digital binary data. In this modulation technique, carrier frequency is varied in accordance with the baseband digital inputs while amplitude remains constant.ĭue to this it is widely employed in modern digital radio systems due to its immunity against noise. The links to difference between various modulation types such as QAM, BPSK, QPSK, OQPSK are also mentioned.
This page compares 2FSK modulation vs 4FSK modulation and mentions difference between 2FSK modulation and 4FSK modulation types.ĢFSK Modulator and 4FSK modulator are used for these modulation types. 2FSK vs 4FSK | Difference between 2FSK modulation and 4FSK modulation
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