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  1. 1. EEP316 Laboratory Pulse Amplitude Modulation and Time Division Multiplexing 13/3/13 Indra Bhushan 2010EE50548 Umang Gupta 2010EE50564 Vivek Mangal 2010EE50566
  2. 2. PAM and Time Division Multiplexing Aim: 1. To generate time division multiplexed PAM signal. 2. Channel selection from PAM-TDM signal by demultiplexing. Theory: By Nyquist theorem we know that a signal of Bandwidth W can be regenerated completely from its time-domain samples that are sampled 1/2w. Hence only this samples need to be transmitted to transmit the signal. A channel normally has higher BW than signal and hence most of the spectrum gets wasted. So we can multiplex two signals in a single time period so that they do not affect each other while transmitting. This can be achieved by sampling at slightly different times. This actually helps in utilising the channel in efficient way. The message can be reconstructed by taking back those samples, or by using a switch that switches every T sec and hence taking out only the required signal. Observations: Here, we did only demultiplexing of the signal.
  3. 3. Signals can be de-multiplexed by having knowledge about the sampling clock. Also differnet signals can be sent simultaneously this way.