Explore the four common electromagnetic wave multiplexing techniques: FDM, TDM, CDM, and WDM, crucial in modern data transmission.
Four Most Common Electromagnetic Wave Multiplexing Techniques
Multiplexing is a method used in data communication to combine multiple signal types into a single carrier signal for transmission. This article explores four common types of multiplexing techniques used with electromagnetic waves.
1. Frequency Division Multiplexing (FDM)
Frequency Division Multiplexing (FDM) is a technology that divides the total bandwidth available into a series of non-overlapping frequency sub-bands, each of which is used to carry a separate signal. This technique allows multiple users to share a common communication channel simultaneously.
2. Time Division Multiplexing (TDM)
Time Division Multiplexing (TDM) is a technique where multiple signals are combined for transmission on a single communications channel. Each signal is broken into segments and each segment is assigned a time slot, enabling the simultaneous transmission of multiple signals.
3. Code Division Multiplexing (CDM)
Code Division Multiplexing (CDM), also known as Code Division Multiple Access (CDMA), is a digital multiplexing technique that uses spread-spectrum technology and a special coding scheme to allow multiple users to be multiplexed over the same physical channel.
4. Wavelength Division Multiplexing (WDM)
Wavelength Division Multiplexing (WDM) is a technology in fiber-optic communications where multiple wavelengths of light (i.e., different colours of the optical spectrum) are used to transmit signals simultaneously over a single fiber.
In Summary
In conclusion, these multiplexing techniques are critical to maximizing the efficiency of data transmission in modern communication systems. Each technique has its advantages and specific applications, but all serve the common goal of allowing multiple signals to share a single communication channel.
