Eastern Mediterranean University
Faculty of Engineering
Department of Electrical and Electronic Engineering
EENG 360 Communication System I Laboratory
LAB 6
TIME DIVISION MULTIPLEXING AND DEMULTIPLEXING
Objectives:
1. To examine signal sampling, aliasing and signal reconstruction.
2. To implement a time division multiplexing system using MATLAB
Simulink.
Theory
While two or more messages need to be transmitted in a RF channel
simultaneously, some transmission schemes, such as TDM, FDM and
CDMA, etc, have been proposed for satisfying this requirement. Among
these, the TDM is the most fundamental one. The time division Multiplexer
(TDM MUX) module is used to recombine two analog signals into one data
stream. It should be noted that, each signal should be sampled at the Nyquist
rate ( in order to avoid aliasing. Also, time division Demultiplexer
(TDM DEMUX) is used to reconstruct the original signals from the
multiplexed data stream. Multiplexing and Demultiplexing are illustrated in
Fig. 1.
Fig. 1: Illustration of TDM MUX and TDM DEMUX
Procedure
1. Arrange the functional blocks as shown in Simulink model.
2. Assign required parameters to each functional block.
3. Observe the outputs on scope.
Simulink Model
Parameters
Output
