Basics of wireless technology: wireless signals and modulation

There was a time when homes, corporate-level offices and other institutions relied on computers and networking a lot were covered by mess of cables, even if the cables was managed to disguise the mess to some degree, still the wires were all over. Things have changed a lot since the dawn of wireless technology. Now with the power of wireless technology, majority of that mess of cables is gone and connection is built between one or more computer via the supernatural medium.

Wireless signals

Is it though? Is the connection built really on some supernatural medium? Of course not. All of these Wi-Fi gadgets that we use to transfer data or receive data and so on happens via unseen wave but existing medium which can be measured with some sort of device. Wireless signals are made possible via the electromagnetic radiation or waves travelling in the air.

Electromagnetic energy has a wide range of spectrum, from the shortest Gamma waves till the longest radio waves. The way this field is created is by electrical energy via piece of metal, for instance, the antenna of the radio, satellite etc. And waves are formed by the sort of aftereffects of the magnetic field being created. These waves can travel from smaller distance to long distance.

At this age, there are plenty of wireless technology we can see in the market which is exhaustive. The most common kind of wireless technologies which are massively used are AM, FM radio, WiFi, Television, Satellite signals for GPS, TV, walkie-talkie, Cellular phones and Bluetooth etc. Although they are all wireless, their functionality and characteristic vary. So what differs them from each other? This is where the Frequency comes in.


Not only wireless technology varies in terms of the frequencies but also how they transmit information as well. Wireless signals need modulation or charged to send data over signal. The type of modulation varies based on the make and model of the device and technology used.

For instance, the AM and FM modulation stands for ‘Amplitude Modulation’ and ‘Frequency Modulation’.

Other crucial parameters of wireless signals are frequency and amplitude. These ones we are going to describe in the next article dedicated to the technology used by wireless connections. Make sure you are also aware of the meaning of such important terms as receivers and transmitters.