Some Other Types of Multiplexing
There are some more types of multiplexing that are discussed here.
1. Code Division Multiplexing
It is a type of multiplexing where each code is distributed among different spectrums so that each one of them can work at the same time simultaneously. It is also called Code Division Multiple Access (CDMA). CDMA makes use of spectrum technology along with analog-to-digital conversion(ADC). It is thus used by various radio communication technologies. Mainly, it is used for mobile communication.
Advantages of Code Division Multiplexing
- It provides enhanced data communication capabilities.
- It does not compress the bandwidth of other frequencies.
2. Orthogonal Frequency Division Multiplexing
Orthogonal frequency-division multiplexing (OFDM) is a digital communication technique initially developed for use in cable television systems. OFDM is similar to the broadcasting technique known as frequency division multiplexing (also known as FDM), which uses a multitude of transmitters and receivers to send information on different frequencies over a single wire, such as an electrical power cable.
OFDM vs FDM
Uses of OFDM
- OFDM is used in Digital radio, Digital Radio Mondiale, digital audio broadcasting, and satellite radio.
- OFDM is used in Wired data transmission.
3. Space Division Multiplexing
Space Division Multiplexing (SDM) is the combination of Frequency Division Multiplexing (FDM) and Time Division Multiplexing (TDM). It basically means that a particular channel is used against a particular frequency band for some time.
Advantages of Space Division Multiplexing
- It provides a high data transmission rate.
- Some Passive Optical Network (POV) implementations use SDM.
Multiplexing (Channel Sharing) in Computer Network
Multiplexing means multiple sources but one link. An alternative approach is a Direct point-to-point connection, but it has several problems as it requires an I/O port for each device, a need line for each device, and also a large amount of wiring needed if on different floors. Instead, if we use a multiplexer approach then all devices are connected to MUX and one line to the host, the link carries multiple channels of information and several lines equal to the number of lines out.