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OFDM is a digital modulation process that splits a communication signal into several narrow bandwidth channels operating at different frequencies to prevent crosstalk and external interference. It has applications in radio networks, amateur radio systems, digital television, internet connections, and wireless local area networks.
Orthogonal frequency division multiplexing, or OFDM, is a digital modulation process used today in computer technology. Essentially, OFDM is configured to split a communication signal into several channels. Each of these channels is formatted in narrow bandwidth modulation, with each channel operating at a different frequency. The process of OFDM allows multiple channels to operate within close frequency levels without affecting the integrity of the data transmitted in a channel.
The history of OFDM dates back to the 1960s. At the time, there was a need to use broadband transmissions more efficiently without creating situations where signals would be subject to a phenomenon called crosstalk. Basically, crosstalk occurs when two audio sources transmit at the same time. The end result is that the message of each broadcast is partially obscured for anyone attempting to listen to one of the messages. Crosstalk can be likened to two people choosing to talk while another individual is already talking.
Generally, the OFDM process is focused on preventing the occurrence of crosstalk, or any other type of external interference with the quality of the transmission. However, the method has some limited capabilities for attempting to improve the quality of the broadcast proper. For example, OFDM can sometimes be used to minimize background noise residing in the broadcast or to raise the volume level if the broadcast has poor sound clarity.
The use of OFDM is common all over the world. Many radio networks around the world use OFDM to service their broadcast ranges. Some amateur radio systems also employ elements of OFDM to send signals. There are some applications of OFDM that lend themselves well to the audio component of digital television, and it is also possible to use OFDM to increase the speed of an Internet connection over a standard telephone line. With the emergence of more wireless communication methods, OFDM is also finding its place in wireless local area networks.
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