ELECTRONICS AND COMMUNICATION ENGINEERING


WDC


Unit -I    Sampling process and wave form coding 



Basic elements of a digital communication system-Sampling Theorem - Sampling and signal recovery -PAM, PCM -Channel noise and error- Quantization Noise-SNR -TDM -DM– ADMLinear prediction, - DPCM


Unit -II      Baseband Pulse Transmission


Discrete PAM signals - Matched filter - Intersymbol Interference- Nyquist’s criterion for Distortion less Transmission- Correlative coding –Baseband M-ary PAM systems -Adaptive Equalization-Eye patterns 


Unit -III      Pass band transmission



Gram-Schmidt Orthogonalization Procedure; Geometric Interpretation of Signals; Correlation Receiver- Introduction to digital modulation schemes- Generation, Detection, BW,PSD of ASK, FSK, PSK, DPSK, QPSK, Comparison of digital modulation systems - Carrier and symbol synchronization. 


Unit -IV      Error Control Coding       



Channel coding theorem -Linear block codes - Cyclic codes –Convolutional codes - Maximum likelihood decoding - Viterbi Algorithm- Trellis coded modulation.


Unit -V      Wireless Channel Models



Basic cellular concepts- propagation effects-Fading- Channel models- statistical characterization of multipath channels, Delay spread and Doppler spread, classification of multipath channels. Diversity techniques