GFSK vs FSK: Understanding the Key Differences

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fsk
modulation
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digital communication

This page compares GFSK and FSK modulation techniques across various system parameters. Let’s dive into the differences.

FSK (Frequency Shift Keying)

FSK stands for Frequency Shift Keying. This modulation technique is used to modulate a binary string of 1s and 0s, making it suitable for transmission using an RF carrier frequency from one end to another.

A simple example of FSK is Binary FSK (BFSK). In BFSK, binary information (1 and 0) is represented by a change in frequency. For example, binary 1 is represented by frequency f1, and binary 0 is represented by frequency f2.

FSK modulation

FSK modulation

The basic digital modulation types include ASK, FSK, and PSK.

One significant drawback of FSK modulation is its unlimited spectral width. In FSK, the carrier frequency (fc) jumps sharply to a different frequency (fd). This significantly decreases spectral efficiency.

Continuous phase FSK modulation with an index of 0.5 is referred to as MSK modulation.

GFSK (Gaussian Frequency Shift Keying)

GFSK stands for Gaussian Frequency Shift Keying modulation.

In GFSK, baseband pulses (consisting of -1 and 1) are first passed through a Gaussian filter before modulation. This process smooths the pulses and limits the modulated spectrum width. This is known as pulse shaping.

In GFSK, the spectral width is limited due to the filter. Here, fc climbs slowly and eventually reaches a value equal to fd.

PSK Advantages and Disadvantages: Phase Shift Keying

PSK Advantages and Disadvantages: Phase Shift Keying

Explore the pros and cons of Phase Shift Keying (PSK), a digital modulation technique, including bandwidth efficiency, error susceptibility, and implementation complexity.

modulation
psk
digital communication

GFSK Modulation: Advantages and Disadvantages

Explore the benefits and drawbacks of GFSK modulation, including its spectral efficiency, bandwidth usage, and limitations in noise sensitivity and constant envelope applications.

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modulation
spectral efficiency

QPSK vs MSK: Modulation Techniques Compared

Explore the key differences between QPSK and MSK modulation techniques, including phase change, amplifier requirements, bandwidth, and power spectral density.

modulation
qpsk
msk
PSK Modulation: Types and Applications

PSK Modulation: Types and Applications

Explore PSK (Phase Shift Keying) modulation techniques, including BPSK, QPSK, and higher-order PSK, with applications in wireless, satellite, and deep space communication.

modulation
psk
wireless