00321nam a2200109Ia 4500008004100000041000800041082001600049100001900065245006000084260005400144300001300198231228s1998    xx            000 0 und d  aeng  a658.45bCOU  aCOUCH (Leon W)  aModern communication systems principles and application  aNew DelhibPrentice Hall of India New Delhic1998  axxv, 597