Communication systems : analog & digital 
Singh, R.P. 
 - Second edition. 
 -  Tata McGraw-Hill Publishing Company Limited.  2007 
 - xi, 584 pages 
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<br/><br/><label>ISBN: </label>978-0-07-063454-1 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Digital communications.
<br/><br/><label>Dewey Class. No.: </label>621.382 Si6c 2007