EC6512 Communication System Lab Manual – ECE 5th SEM Anna University

EC6512 Communication System Lab Manual

Anna University Regulation 2013 Electronics and Communication Engineering (ECE) EC6512 COMM SYS LAB Manual for all experiments is provided below. Download link for ECE 5th SEM EC6512 Communication System Lab Manual is listed down for students to make perfect utilization and score maximum marks with our study materials.

Anna University Regulation 2013 Electronics and Communication Engineering (ECE) 5th SEM EC6512 COMM SYS LAB-Communication System Lab Manual

SIGNAL SAMPLING AND RECONSTRUCTION

AIM:
To study the process of sampling and time division multiplexing of four signals using pulse amplitude modulation and De-modulation and to reconstruct the signals at the receiver using filters.

APPARATUS REQUIRED:

1. Sampling and TDM Communication trainer kit:
2. Multi Output Power Supply.
3. Patch cords.
4. CRO (60MHz)

THEORY

The Sample and Hold circuit uses two buffers to keep a voltage level stored in a capacitor. Sample will charge the capacitor to the present signal level, while the input buffer ensures the signal won’t be changed by the charging process. From there, the output buffer will make sure that the voltage level across the storage cap won’t decrease over time. Sclear will short out the storage cap, discharging it and setting the output to 0V.In actual practice, the switches used are various forms of transistor switch, which provides cleaner switching and also allows another circuit to control the sample and clearing operations. Excellent Sample and Hold circuits like the LF398 are available on a single chip for cheap and easy use.

Sample and Hold circuits are used internally in Analog to Digital conversion. We might also use them to hold a given signal value from any particular sensor on a robot, for analysis and later use.

In TDM, by interleaving samples of several source waveforms in time, it is possible to transmit enough information to a receiver, via only one channel to recover all message waveforms.

The conceptual implementation of the time multiplexing of N similar messages fn(t) where n= 1,2,3,…..N is illustrated in fig 1. the time allocated to one sample of one message is called time slot. The time intervals over which all message signals are sampled atleast once is called a Frame. The portion of the time slot not used by the system may be allocated to other functions like signaling, monitoring, synchronization, etc.

EC6512 Comm Sys Lab Manual with all experiments – Download Here

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