Uncertainity,Huffmann Coding Techniques,SOURCE CODING,Entropy,Property of entropy,source coding therom,Huffman coding,Input,Output,Extended Huffman coding,Extended Huffman codebook,Channel Capacity Theorem, Channel capacity in wireless communications,AWGN channel,Frequency-selective channel..

GSM Services,GSM functional architecture,System architecture,Radio subsystem,Base station controller,Mobile station,Network and switching subsystem,Mobile services switching center,Mobile services switching center.

use of data communication network,history of data communication,standard organisition for data communication,some of the standard organisation of data communication are as,internal standard organization,consultative commite for international telephony and telegraphy.

effects of noise on a signal,types of signal,correlated and un correlated,types of uncorrelated noise,external noise and internal noise,atmospheric noise,extraterrestrial noise,solar noise,man made noise,internal noise,transist time noise,practicability of antena,to remove interference,reduction of noise,multiplexing.