ANALOG AND DIGITAL COMMUNICATION SYSTEMS

  MULTIPLEXING TECHNIQUES :- Define multiplexing ? need for multiplexing ? Types of multiplexing techniques ? Block diagram of FDM ? Block diagram of TDM ? Applications of TDM,FDM? Advantages & Disadvantages  of TDM ? Advantages & Disadvantages  of FDM ? Compare FDM,TDM ? NEED for MODEM ? Define modem ?different types of modem ? Draw block diagram of DSL ? Draw block diagram of ADSL ? Draw band diagram for ADSL ?

  TRANSMITTERS AND RECEIVERS Specifications of AM transmitters ? Specifications of FM transmitters ? Differences between AM low level & AM high level transmitters ? Block diagram of AM low level transmitter ? Block diagram of AM high level transmitter ? Block diagram of Arm strong FM transmitter *(indirect method) ? Define sensitivity, selectivity, fidelity ? Block diagram of TRF receiver? Define Heterodyning , Super Heterodyning ? Block diagram of Super heterodyne AM receiver? Need of AVC/AGC ? Draw circuit diagram of demodulation in AM receiver ? Draw circuit diagram of Foster Seely Discriminator ?

 UNIT 3 PREPARATION SHORTS :- Give different types of encoding  formats in digital encoding ? Different types of data transmission techniques ? Advantages and disadvantages of parallel data transmission ? Advantages and disadvantages of serial data transmission ? Short notes on asynchronous transmission? Short notes on synchronous transmission? Need for start and stop bits in asynchronous transmission ? Advantages and disadvantages asynchronous transmission ? Advantages and disadvantages synchronous transmission ? Define bit overhead ,overhead efficiency ? What are error control techniques ? Different types of error detection and control / correction methods? Need for digital modulation ? Define bit rate and baud rate ? Basic types of digital modulation techniques ? Draw the wave forms for ASK , PSK, FSK ? Compare ASK , FSK, PSK? Block diagram of  ask , fsk , psk ?

  DIGITAL COMMUNICATION PRINCIPLES:- Define communication ?classification of communication? Define analog and digital signals Advantages and disadvantages of digital communication over analog communication ? Information capacity of a channel ? Convertion of analog signal to digital signal? Define sampling ? explain sampling theorem? Define nyquist and aliasing effect ? Draw the waveform for PAM,PWM,PPM? Compare PAM , PWM ,PPM? Define sampling ,quantization,encoding ? Draw the block diagram for PCM coding and decoding ? Applications ,advantages,disadvantages of PCM ?

  ANALOG MODULATION TECHNIQUES:- Basic elements of communication system? Applications of different frequencies in spectrum? Define modulation ? need for modulation ? Classification of various modulation techniques? Difference between base band,carrier,modulated signal ? Define AM,FM,PM? Define modulation index ?draw the wave forms for M<1,M=1,M>1 ? Dffects of over modulation? Advantages & dis advantages of FM over AM? Advantages and dis advantages of DSB-SC, SSB-SC? Define pre-emphasis & de-emphasis with circuits diagrams ? Advantages of pre-emphasis and de-emphasis ? Define noise ? effects of noise in communication systems ? Classification of noise ? Define signal to noise ration ,noise figure ,noise temperature ?

  BASIC ELEMENTS OF COMMUNICATION SYSTEM      INFORMATION SOURCE :   It produces message signal which we want to send.   It converts message signal to electrical signal .(it is also called as input transducer)     TRANSMITTER :   It converts the message signal to suitable form of propagating signal over communication channel.   The process of conversion is possible by modulation. And finally sends the signal through the channel.     CHANNEL :   The path for transmitting a signal is called channel.    It is a medium between transmitter and receiver ( wire / wireless ),use for signal transmission.                      NOISE :      The unwanted form of signal energy is known as noise.        It enters the communication system through channel.          RECEIVER :     The main function of receiver is receiver the message signal from channel     And it produces the original message signal by demodulation process.        DESTINATION :   It is the final stage of communication system     It con