Multiplexelésnél

Multiplexelésnél is a concept that refers to the process of combining multiple signals or data streams into a single channel. This allows for more efficient use of communication resources, such as bandwidth. There are several types of multiplexing, each with its own advantages and applications.

Frequency Division Multiplexing (FDM) divides the total bandwidth of a communication channel into several non-overlapping frequency bands. Each signal is assigned its own unique frequency band, and they are transmitted simultaneously. This method is commonly used in radio broadcasting and traditional telephone systems.

Time Division Multiplexing (TDM) divides the available time on a communication channel into discrete time slots. Each signal is allocated a specific time slot during which it can transmit its data. This ensures that multiple users can share the same channel without interfering with each other. TDM is often used in digital communication systems.

Code Division Multiplexing (CDM) uses unique codes to differentiate signals that are transmitted over the same frequency band and at the same time. Each signal is modulated with a unique spreading code, and the receiver can selectively decode the desired signal by correlating it with the corresponding code. CDM is employed in some mobile communication systems, such as CDMA.

Statistical Time Division Multiplexing (STDM) is a variation of TDM that dynamically allocates time slots based on the traffic demand of each signal. It is more efficient than traditional TDM when the data traffic is bursty or unpredictable.

Orthogonal Frequency Division Multiplexing (OFDM) is a digital modulation technique that divides a single data stream into multiple lower-rate streams, each transmitted on a separate sub-carrier frequency. This technique is robust against multipath interference and is widely used in modern wireless communication standards like Wi-Fi and 4G/5G cellular networks.