{"id":2761,"date":"2011-06-24T12:00:07","date_gmt":"2011-06-24T10:00:07","guid":{"rendered":"http:\/\/msc.ds.unipi.gr\/?p=2761"},"modified":"2022-07-13T12:56:28","modified_gmt":"2022-07-13T10:56:28","slug":"wireless-and-satellite-communications-2","status":"publish","type":"post","link":"https:\/\/masters.ds.unipi.gr\/dcomms\/wireless-and-satellite-communications-2\/","title":{"rendered":"\u0391\u03c3\u03cd\u03c1\u03bc\u03b1\u03c4\u03b5\u03c2 \u03ba\u03b1\u03b9 \u0394\u03bf\u03c1\u03c5\u03c6\u03bf\u03c1\u03b9\u03ba\u03ad\u03c2 \u0395\u03c0\u03b9\u03ba\u03bf\u03b9\u03bd\u03c9\u03bd\u03af\u03b5\u03c2"},"content":{"rendered":"<h3>\u03a3\u03c4\u03cc\u03c7\u03bf\u03c2<\/h3>\n<p style=\"text-align: justify;\">\u03a3\u03c4\u03cc\u03c7\u03bf\u03c2 \u03c4\u03bf\u03c5 \u03bc\u03b1\u03b8\u03ae\u03bc\u03b1\u03c4\u03bf\u03c2 \u03b5\u03af\u03bd\u03b1\u03b9 \u03b7 \u03b5\u03bc\u03b2\u03ac\u03b8\u03c5\u03bd\u03c3\u03b7 \u03c4\u03c9\u03bd \u03c6\u03bf\u03b9\u03c4\u03b7\u03c4\u03ce\u03bd \u03c3\u03b5 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\u03ba\u03b1\u03b9 \u03c7\u03c9\u03c1\u03b9\u03ba\u03ac \u03bf\u03bc\u03bf\u03b9\u03cc\u03bc\u03bf\u03c1\u03c6\u03b5\u03c2 \u03c3\u03c4\u03bf\u03b9\u03c7\u03b5\u03b9\u03bf\u03ba\u03b5\u03c1\u03b1\u03af\u03b5\u03c2. \u039f\u03c1\u03b1\u03c4\u03ae \u03c0\u03b5\u03c1\u03b9\u03bf\u03c7\u03ae. \u03a4\u03c1\u03bf\u03c6\u03bf\u03b4\u03cc\u03c4\u03b7\u03c3\u03b7 \u03c3\u03c4\u03bf\u03b9\u03c7\u03b5\u03b9\u03bf\u03ba\u03b5\u03c1\u03b1\u03b9\u03ce\u03bd. \u03a0\u03b1\u03c1\u03ac\u03bc\u03b5\u03c4\u03c1\u03bf\u03b9 \u03b4\u03b9\u03b1\u03b3\u03c1\u03ac\u03bc\u03bc\u03b1\u03c4\u03bf\u03c2 \u03b1\u03ba\u03c4\u03b9\u03bd\u03bf\u03b2\u03bf\u03bb\u03af\u03b1\u03c2. \u03a3\u03c4\u03c1\u03bf\u03c6\u03ae \u03b4\u03b9\u03b1\u03b3\u03c1\u03ac\u03bc\u03bc\u03b1\u03c4\u03bf\u03c2 \u03b1\u03ba\u03c4\u03b9\u03bd\u03bf\u03b2\u03bf\u03bb\u03af\u03b1\u03c2<\/li>\n<li>\u03a3\u03c4\u03b1\u03c4\u03b9\u03c3\u03c4\u03b9\u03ba\u03ae \u03b5\u03c0\u03b5\u03be\u03b5\u03c1\u03b3\u03b1\u03c3\u03af\u03b1 \u03c3\u03b7\u03bc\u03ac\u03c4\u03c9\u03bd \u03b1\u03c0\u03cc \u03c3\u03c4\u03bf\u03b9\u03c7\u03b5\u03b9\u03bf\u03ba\u03b5\u03c1\u03b1\u03af\u03b5\u03c2. \u0395\u03c0\u03b5\u03be\u03b5\u03c1\u03b3\u03b1\u03c3\u03af\u03b1 \u03c3\u03c4\u03b5\u03bd\u03ae\u03c2 \u03b6\u03ce\u03bd\u03b7\u03c2. Conventional beamformer, null steering beamformer. \u03a6\u03af\u03bb\u03c4\u03c1\u03b1 Wiener \u03ba\u03b1\u03b9 \u03c4\u03b5\u03c7\u03bd\u03b9\u03ba\u03ad\u03c2 \u03c8\u03b7\u03c6\u03b9\u03b1\u03ba\u03bf\u03cd beamforming<\/li>\n<li>\u03a4\u03b5\u03c7\u03bd\u03b9\u03ba\u03ad\u03c2 \u03b5\u03ba\u03c4\u03af\u03bc\u03b7\u03c3\u03b7\u03c2 \u03c4\u03b7\u03c2 \u03ba\u03b1\u03c4\u03b5\u03cd\u03b8\u03c5\u03bd\u03c3\u03b7\u03c2 \u03ac\u03c6\u03b9\u03be\u03b7\u03c2 (Bartlett, Capon, MUSIC, Root-MUSIC, Minimum-Norm Method, ESPRIT)<\/li>\n<li>\u0391\u03bd\u03ac\u03c0\u03c4\u03c5\u03be\u03b7 \u03b4\u03bf\u03c1\u03c5\u03c6\u03bf\u03c1\u03b9\u03ba\u03ce\u03bd \u03c3\u03c5\u03c3\u03c4\u03b7\u03bc\u03ac\u03c4\u03c9\u03bd \u03ba\u03b1\u03b9 \u03b5\u03be\u03ad\u03bb\u03b9\u03be\u03b7 \u03c5\u03c0\u03b7\u03c1\u03b5\u03c3\u03b9\u03ce\u03bd. \u0393\u03b5\u03c9\u03bc\u03b5\u03c4\u03c1\u03b9\u03ba\u03ad\u03c2 \u03c0\u03b1\u03c1\u03ac\u03bc\u03b5\u03c4\u03c1\u03bf\u03b9 \u03ba\u03b1\u03b9 \u03c3\u03b7\u03bc\u03b1\u03bd\u03c4\u03b9\u03ba\u03ad\u03c2 \u03c4\u03c1\u03bf\u03c7\u03b9\u03ad\u03c2. \u0394\u03b9\u03b1\u03c4\u03ac\u03be\u03b5\u03b9\u03c2 \u03ba\u03b1\u03b9 \u03b5\u03af\u03b4\u03b7 \u03b1\u03bd\u03b1\u03bc\u03b5\u03c4\u03b1\u03b4\u03bf\u03c4\u03ce\u03bd. \u03a3\u03c4\u03bf\u03b9\u03c7\u03b5\u03b9\u03ce\u03b4\u03b7 \u03b4\u03bf\u03bc\u03b9\u03ba\u03ac \u03c7\u03b1\u03c1\u03b1\u03ba\u03c4\u03b7\u03c1\u03b9\u03c3\u03c4\u03b9\u03ba\u03ac. \u039a\u03b5\u03c1\u03b1\u03af\u03b5\u03c2 \u03b4\u03bf\u03c1\u03c5\u03c6\u03bf\u03c1\u03b9\u03ba\u03ce\u03bd \u03c3\u03c5\u03c3\u03c4\u03b7\u03bc\u03ac\u03c4\u03c9\u03bd. \u03a0\u03b1\u03b3\u03ba\u03cc\u03c3\u03bc\u03b9\u03bf\u03b9 \u03bf\u03c1\u03b3\u03b1\u03bd\u03b9\u03c3\u03bc\u03bf\u03af \u03b4\u03bf\u03c1\u03c5\u03c6\u03bf\u03c1\u03b9\u03ba\u03ce\u03bd \u03c3\u03c5\u03c3\u03c4\u03b7\u03bc\u03ac\u03c4\u03c9\u03bd<\/li>\n<li>\u0398\u03cc\u03c1\u03c5\u03b2\u03bf\u03c2 \u03c3\u03c4\u03b1 \u03b4\u03bf\u03c1\u03c5\u03c6\u03bf\u03c1\u03b9\u03ba\u03ac \u03c3\u03c5\u03c3\u03c4\u03ae\u03bc\u03b1\u03c4\u03b1 \u03b5\u03c0\u03b9\u03ba\u03bf\u03b9\u03bd\u03c9\u03bd\u03b9\u03ce\u03bd (\u03b4\u03ad\u03ba\u03c4\u03b5\u03c2-\u03ba\u03b5\u03c1\u03b1\u03af\u03b5\u03c2). \u0394\u03b9\u03b1\u03c4\u03ac\u03be\u03b5\u03b9\u03c2 \u03b4\u03b5\u03ba\u03c4\u03ce\u03bd. \u0394\u03bf\u03c1\u03c5\u03c6\u03bf\u03c1\u03b9\u03ba\u03bf\u03af \u03b5\u03bd\u03b9\u03c3\u03c7\u03c5\u03c4\u03ad\u03c2 \u03ba\u03b1\u03b9 \u03b6\u03b7\u03c4\u03ae\u03bc\u03b1\u03c4\u03b1 \u03bc\u03b7 \u03b3\u03c1\u03b1\u03bc\u03bc\u03b9\u03ba\u03bf\u03c4\u03ae\u03c4\u03c9\u03bd. \u0394\u03b5\u03af\u03ba\u03c4\u03b5\u03c2 \u03b5\u03c0\u03af\u03b4\u03bf\u03c3\u03b7\u03c2 \u03c3\u03b5 \u03c3\u03c5\u03bd\u03b8\u03ae\u03ba\u03b5\u03c2 \u03ba\u03b1\u03b8\u03b1\u03c1\u03bf\u03cd \u03bf\u03c5\u03c1\u03b1\u03bd\u03bf\u03cd \u03ba\u03b1\u03b9 \u03b2\u03c1\u03bf\u03c7\u03ae\u03c2<\/li>\n<li>\u03a4\u03b5\u03c7\u03bd\u03b9\u03ba\u03ad\u03c2 \u03bc\u03b5\u03c4\u03ac\u03b4\u03bf\u03c3\u03b7\u03c2 (\u03ba\u03c5\u03c1\u03af\u03c9\u03c2 \u03c8\u03b7\u03c6\u03b9\u03b1\u03ba\u03ae\u03c2) \u03ba\u03b1\u03b9 \u03c3\u03c7\u03b5\u03b4\u03af\u03b1\u03c3\u03b7 \u03c4\u03c9\u03bd \u03b6\u03b5\u03cd\u03be\u03b5\u03c9\u03bd. \u03a0\u03b1\u03c1\u03b1\u03b4\u03b5\u03af\u03b3\u03bc\u03b1\u03c4\u03b1 \u03c3\u03c7\u03b5\u03b4\u03af\u03b1\u03c3\u03b7\u03c2 \u03b3\u03b9\u03b1 \u03c3\u03c4\u03b1\u03b8\u03b5\u03c1\u03ac \u03ba\u03b1\u03b9 \u03ba\u03b9\u03bd\u03b7\u03c4\u03ac \u03c3\u03c5\u03c3\u03c4\u03ae\u03bc\u03b1\u03c4\u03b1 \u03b4\u03bf\u03c1\u03c5\u03c6\u03bf\u03c1\u03b9\u03ba\u03ce\u03bd \u03b5\u03c0\u03b9\u03ba\u03bf\u03b9\u03bd\u03c9\u03bd\u03b9\u03ce\u03bd<\/li>\n<li>\u03a4\u03b5\u03c7\u03bd\u03b9\u03ba\u03ad\u03c2 \u03c0\u03bf\u03bb\u03bb\u03b1\u03c0\u03bb\u03ae\u03c2 \u03c0\u03c1\u03cc\u03c3\u03b2\u03b1\u03c3\u03b7\u03c2 \u03c3\u03c4\u03b1 \u03b4\u03bf\u03c1\u03c5\u03c6\u03bf\u03c1\u03b9\u03ba\u03ac \u03b4\u03af\u03ba\u03c4\u03c5\u03b1 (TDMA, FDMA, CDMA). \u0394\u03af\u03ba\u03c4\u03c5\u03b1 VSATs, \u03c4\u03bf\u03c0\u03bf\u03bb\u03bf\u03b3\u03af\u03b5\u03c2 \u03ba\u03b1\u03b9 \u03b1\u03c1\u03c7\u03b9\u03c4\u03b5\u03ba\u03c4\u03bf\u03bd\u03b9\u03ba\u03ad\u03c2 \u03c3\u03c5\u03c3\u03c4\u03b7\u03bc\u03ac\u03c4\u03c9\u03bd<\/li>\n<\/ul>\n<p><!--more--><\/p>\n<h3>\u03a0\u03c1\u03bf\u03c4\u03b5\u03b9\u03bd\u03cc\u03bc\u03b5\u03bd\u03b1 \u03a3\u03c5\u03b3\u03b3\u03c1\u03ac\u03bc\u03bc\u03b1\u03c4\u03b1<\/h3>\n<ul>\n<li>\u03a6. \u039a\u03c9\u03bd\u03c3\u03c4\u03b1\u03bd\u03c4\u03af\u03bd\u03bf\u03c5, \u0391. \u039a\u03b1\u03bd\u03ac\u03c4\u03b1\u03c2, \u0393. \u03a0\u03ac\u03bd\u03c4\u03bf\u03c2, \u201c\u03a3\u03c5\u03c3\u03c4\u03ae\u03bc\u03b1\u03c4\u03b1 \u039a\u03b9\u03bd\u03b7\u03c4\u03ce\u03bd \u0395\u03c0\u03b9\u03ba\u03bf\u03b9\u03bd\u03c9\u03bd\u03b9\u03ce\u03bd\u201d, \u0395\u03ba\u03b4\u03cc\u03c3\u03b5\u03b9\u03c2 \u03a0\u03b1\u03c0\u03b1\u03c3\u03c9\u03c4\u03b7\u03c1\u03af\u03bf\u03c5, 2\u03b7 \u03ad\u03ba\u03b4\u03bf\u03c3\u03b7, 2013<\/li>\n<li>Huang, C. Papadias, and S. Venkatesan, \u201cMIMO Communication for Cellular Networks\u201d, Springer, 2012<\/li>\n<li>A. \u039a\u03b1\u03bd\u03ac\u03c4\u03b1\u03c2, \u0393. \u03a0\u03ac\u03bd\u03c4\u03bf\u03c2, &#8220;\u0391\u03c3\u03cd\u03c1\u03bc\u03b1\u03c4\u03b5\u03c2 \u0395\u03c0\u03b9\u03ba\u03bf\u03b9\u03bd\u03c9\u03bd\u03af\u03b5\u03c2&#8221;, \u0395\u03ba\u03b4\u03cc\u03c3\u03b5\u03b9\u03c2 \u03a0\u03b1\u03c0\u03b1\u03c3\u03c9\u03c4\u03b7\u03c1\u03af\u03bf\u03c5, 2\u03b7 \u03ad\u03ba\u03b4\u03bf\u03c3\u03b7, 2017<\/li>\n<li>T. Pratt, C.W. Bostian, J.E. Allnutt, \u0395\u03c0\u03b9\u03c3\u03c4\u03b7\u03bc\u03bf\u03bd\u03b9\u03ba\u03ae \u0395\u03c0\u03b9\u03bc\u03ad\u03bb\u03b5\u03b9\u03b1 \u0391. \u039a\u03b1\u03bd\u03ac\u03c4\u03b1\u03c2, \u201c\u0394\u03bf\u03c1\u03c5\u03c6\u03bf\u03c1\u03b9\u03ba\u03ad\u03c2 \u0395\u03c0\u03b9\u03ba\u03bf\u03b9\u03bd\u03c9\u03bd\u03af\u03b5\u03c2\u201d, 2\u03b7 \u0388\u03ba\u03b4\u03bf\u03c3\u03b7, \u0395\u03ba\u03b4\u03cc\u03c3\u03b5\u03b9\u03c2 \u03a0\u03b1\u03c0\u03b1\u03c3\u03c9\u03c4\u03b7\u03c1\u03af\u03bf\u03c5, 2009<\/li>\n<li>G. Maral, M. Bousquet, \u201cSatellite Communications Systems\u201d, John Wiley &amp; Sons, 4th Edition, 2002<\/li>\n<li>\u0394. \u0392\u03bf\u03c5\u03b3\u03b9\u03bf\u03cd\u03ba\u03b1\u03c2, &#8220;\u0394\u03bf\u03c1\u03c5\u03c6\u03bf\u03c1\u03b9\u03ba\u03ad\u03c2 \u0395\u03c0\u03b9\u03ba\u03bf\u03b9\u03bd\u03c9\u03bd\u03af\u03b5\u03c2- \u03a4\u03b5\u03c7\u03bd\u03bf\u03bb\u03bf\u03b3\u03af\u03b5\u03c2, \u03a3\u03c5\u03c3\u03c4\u03ae\u03bc\u03b1\u03c4\u03b1 \u03ba\u03b1\u03b9 \u0395\u03c6\u03b1\u03c1\u03bc\u03bf\u03b3\u03ad\u03c2&#8221;, \u03a3\u0395\u0391\u0392, \u039a\u03ac\u03bb\u03bb\u03b9\u03c0\u03bf\u03c2, \u0391\u03b8\u03ae\u03bd\u03b1 2016<\/li>\n<\/ul>\n<p><!--\n\n<h3><span data-mce-type=\"bookmark\" style=\"display: inline-block; width: 0px; overflow: hidden; line-height: 0;\" class=\"mce_SELRES_start\"><\/span>\u03a3\u03c4\u03cc\u03c7\u03bf\u03c2<\/h3>\n\n\n\n<p style=\"text-align: justify;\">\u03a3\u03c4\u03cc\u03c7\u03bf\u03c2 \u03c4\u03bf\u03c5 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\u03b5\u03bd\u03cc\u03c4\u03b7\u03c4\u03b5\u03c2. \u03a3\u03c4\u03b7\u03bd \u03c0\u03c1\u03ce\u03c4\u03b7 \u03b5\u03bd\u03cc\u03c4\u03b7\u03c4\u03b1 \u03b3\u03af\u03bd\u03b5\u03c4\u03b1\u03b9 \u03b1\u03bd\u03b1\u03c3\u03ba\u03cc\u03c0\u03b7\u03c3\u03b7 \u03c4\u03c9\u03bd \u03b2\u03b1\u03c3\u03b9\u03ba\u03ce\u03bd \u03b5\u03bd\u03bd\u03bf\u03b9\u03ce\u03bd \u03c4\u03b7\u03c2 \u03c4\u03b5\u03c7\u03bd\u03bf\u03bb\u03bf\u03b3\u03af\u03b1\u03c2 \u03c4\u03c9\u03bd \u03ba\u03b5\u03c1\u03b1\u03b9\u03ce\u03bd \u03ba\u03b1\u03b9 \u03c4\u03b7\u03c2 \u0397\u03bb\u03b5\u03ba\u03c4\u03c1\u03bf\u03bc\u03b1\u03b3\u03bd\u03b7\u03c4\u03b9\u03ba\u03ae\u03c2 (\u0397\/\u039c) \u03b4\u03b9\u03ac\u03b4\u03bf\u03c3\u03b7\u03c2 \u03ba\u03b1\u03b9 \u03b1\u03bd\u03b1\u03bb\u03cd\u03bf\u03bd\u03c4\u03b1\u03b9 \u03b4\u03b9\u03b5\u03b8\u03bd\u03ae \u03c0\u03c1\u03cc\u03c4\u03c5\u03c0\u03b1 (ITU-R) \u03ba\u03b1\u03b9 \u03c3\u03c5\u03c3\u03c4\u03ac\u03c3\u03b5\u03b9\u03c2 \u03b3\u03b9\u03b1 \u03c4\u03b7 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\u03b4\u03b9\u03b1\u03bc\u03cc\u03c1\u03c6\u03c9\u03c3\u03b7\u03c2 \u03b4\u03b9\u03b1\u03b3\u03c1\u03b1\u03bc\u03bc\u03ac\u03c4\u03c9\u03bd \u03b1\u03ba\u03c4\u03b9\u03bd\u03bf\u03b2\u03bf\u03bb\u03af\u03b1\u03c2.<\/li>\n\n\n \t\n\n<li>\u0395\u03c0\u03b5\u03be\u03b5\u03c1\u03b3\u03b1\u03c3\u03af\u03b1 \u03a3\u03b7\u03bc\u03ac\u03c4\u03c9\u03bd \u03b1\u03c0\u03cc \u03c3\u03c4\u03bf\u03b9\u03c7\u03b5\u03b9\u03bf\u03ba\u03b5\u03c1\u03b1\u03af\u03b5\u03c2. \u0393\u03c1\u03b1\u03bc\u03bc\u03b9\u03ba\u03ad\u03c2 \u03ba\u03b1\u03b9 \u03c7\u03c9\u03c1\u03b9\u03ba\u03ac \u03bf\u03bc\u03bf\u03b9\u03cc\u03bc\u03bf\u03c1\u03c6\u03b5\u03c2 \u03c3\u03c4\u03bf\u03b9\u03c7\u03b5\u03b9\u03bf\u03ba\u03b5\u03c1\u03b1\u03af\u03b5\u03c2. \u039f\u03c1\u03b1\u03c4\u03ae \u03c0\u03b5\u03c1\u03b9\u03bf\u03c7\u03ae. \u03a4\u03c1\u03bf\u03c6\u03bf\u03b4\u03cc\u03c4\u03b7\u03c3\u03b7 \u03c3\u03c4\u03bf\u03b9\u03c7\u03b5\u03b9\u03bf\u03ba\u03b5\u03c1\u03b1\u03b9\u03ce\u03bd. \u03a0\u03b1\u03c1\u03ac\u03bc\u03b5\u03c4\u03c1\u03bf\u03b9 \u03b4\u03b9\u03b1\u03b3\u03c1\u03ac\u03bc\u03bc\u03b1\u03c4\u03bf\u03c2 \u03b1\u03ba\u03c4\u03b9\u03bd\u03bf\u03b2\u03bf\u03bb\u03af\u03b1\u03c2. \u03a3\u03c4\u03c1\u03bf\u03c6\u03ae \u03b4\u03b9\u03b1\u03b3\u03c1\u03ac\u03bc\u03bc\u03b1\u03c4\u03bf\u03c2 \u03b1\u03ba\u03c4\u03b9\u03bd\u03bf\u03b2\u03bf\u03bb\u03af\u03b1\u03c2.<\/li>\n\n\n \t\n\n<li>\u03a3\u03c4\u03b1\u03c4\u03b9\u03c3\u03c4\u03b9\u03ba\u03ae \u03b5\u03c0\u03b5\u03be\u03b5\u03c1\u03b3\u03b1\u03c3\u03af\u03b1 \u03c3\u03b7\u03bc\u03ac\u03c4\u03c9\u03bd \u03b1\u03c0\u03cc \u03c3\u03c4\u03bf\u03b9\u03c7\u03b5\u03b9\u03bf\u03ba\u03b5\u03c1\u03b1\u03af\u03b5\u03c2. \u0395\u03c0\u03b5\u03be\u03b5\u03c1\u03b3\u03b1\u03c3\u03af\u03b1 \u03c3\u03c4\u03b5\u03bd\u03ae\u03c2 \u03b6\u03ce\u03bd\u03b7\u03c2. Conventional beamformer, null steering beamformer. \u03a6\u03af\u03bb\u03c4\u03c1\u03b1 Wiener \u03ba\u03b1\u03b9 \u03c4\u03b5\u03c7\u03bd\u03b9\u03ba\u03ad\u03c2 \u03c8\u03b7\u03c6\u03b9\u03b1\u03ba\u03bf\u03cd beamforming.<\/li>\n\n\n \t\n\n<li>\u0391\u03bd\u03ac\u03c0\u03c4\u03c5\u03be\u03b7 \u03b4\u03bf\u03c1\u03c5\u03c6\u03bf\u03c1\u03b9\u03ba\u03ce\u03bd \u03c3\u03c5\u03c3\u03c4\u03b7\u03bc\u03ac\u03c4\u03c9\u03bd \u03ba\u03b1\u03b9 \u03b5\u03be\u03ad\u03bb\u03b9\u03be\u03b7 \u03c5\u03c0\u03b7\u03c1\u03b5\u03c3\u03b9\u03ce\u03bd. \u0393\u03b5\u03c9\u03bc\u03b5\u03c4\u03c1\u03b9\u03ba\u03ad\u03c2 \u03c0\u03b1\u03c1\u03ac\u03bc\u03b5\u03c4\u03c1\u03bf\u03b9 \u03ba\u03b1\u03b9 \u03c3\u03b7\u03bc\u03b1\u03bd\u03c4\u03b9\u03ba\u03ad\u03c2 \u03c4\u03c1\u03bf\u03c7\u03b9\u03ad\u03c2. \u0394\u03b9\u03b1\u03c4\u03ac\u03be\u03b5\u03b9\u03c2 \u03ba\u03b1\u03b9 \u03b5\u03af\u03b4\u03b7 \u03b1\u03bd\u03b1\u03bc\u03b5\u03c4\u03b1\u03b4\u03bf\u03c4\u03ce\u03bd. \u03a3\u03c4\u03bf\u03b9\u03c7\u03b5\u03b9\u03ce\u03b4\u03b7 \u03b4\u03bf\u03bc\u03b9\u03ba\u03ac \u03c7\u03b1\u03c1\u03b1\u03ba\u03c4\u03b7\u03c1\u03b9\u03c3\u03c4\u03b9\u03ba\u03ac. \u039a\u03b5\u03c1\u03b1\u03af\u03b5\u03c2 \u03b4\u03bf\u03c1\u03c5\u03c6\u03bf\u03c1\u03b9\u03ba\u03ce\u03bd \u03c3\u03c5\u03c3\u03c4\u03b7\u03bc\u03ac\u03c4\u03c9\u03bd. \u03a0\u03b1\u03b3\u03ba\u03cc\u03c3\u03bc\u03b9\u03bf\u03b9 \u03bf\u03c1\u03b3\u03b1\u03bd\u03b9\u03c3\u03bc\u03bf\u03af \u03b4\u03bf\u03c1\u03c5\u03c6\u03bf\u03c1\u03b9\u03ba\u03ce\u03bd \u03c3\u03c5\u03c3\u03c4\u03b7\u03bc\u03ac\u03c4\u03c9\u03bd.<\/li>\n\n\n \t\n\n<li>\u0398\u03cc\u03c1\u03c5\u03b2\u03bf\u03c2 \u03c3\u03c4\u03b1 \u03b4\u03bf\u03c1\u03c5\u03c6\u03bf\u03c1\u03b9\u03ba\u03ac \u03c3\u03c5\u03c3\u03c4\u03ae\u03bc\u03b1\u03c4\u03b1 \u03b5\u03c0\u03b9\u03ba\u03bf\u03b9\u03bd\u03c9\u03bd\u03b9\u03ce\u03bd (\u03b4\u03ad\u03ba\u03c4\u03b5\u03c2-\u03ba\u03b5\u03c1\u03b1\u03af\u03b5\u03c2). \u0394\u03b9\u03b1\u03c4\u03ac\u03be\u03b5\u03b9\u03c2 \u03b4\u03b5\u03ba\u03c4\u03ce\u03bd. \u0394\u03bf\u03c1\u03c5\u03c6\u03bf\u03c1\u03b9\u03ba\u03bf\u03af \u03b5\u03bd\u03b9\u03c3\u03c7\u03c5\u03c4\u03ad\u03c2 \u03ba\u03b1\u03b9 \u03b6\u03b7\u03c4\u03ae\u03bc\u03b1\u03c4\u03b1 \u03bc\u03b7 \u03b3\u03c1\u03b1\u03bc\u03bc\u03b9\u03ba\u03bf\u03c4\u03ae\u03c4\u03c9\u03bd. \u0394\u03b5\u03af\u03ba\u03c4\u03b5\u03c2 \u03b5\u03c0\u03af\u03b4\u03bf\u03c3\u03b7\u03c2 \u03c3\u03b5 \u03c3\u03c5\u03bd\u03b8\u03ae\u03ba\u03b5\u03c2 \u03ba\u03b1\u03b8\u03b1\u03c1\u03bf\u03cd \u03bf\u03c5\u03c1\u03b1\u03bd\u03bf\u03cd \u03ba\u03b1\u03b9 \u03b2\u03c1\u03bf\u03c7\u03ae\u03c2.<\/li>\n\n\n \t\n\n<li>\u03a4\u03b5\u03c7\u03bd\u03b9\u03ba\u03ad\u03c2 \u03bc\u03b5\u03c4\u03ac\u03b4\u03bf\u03c3\u03b7\u03c2 (\u03ba\u03c5\u03c1\u03af\u03c9\u03c2 \u03c8\u03b7\u03c6\u03b9\u03b1\u03ba\u03ae\u03c2) \u03ba\u03b1\u03b9 \u03c3\u03c7\u03b5\u03b4\u03af\u03b1\u03c3\u03b7 \u03c4\u03c9\u03bd \u03b6\u03b5\u03cd\u03be\u03b5\u03c9\u03bd. \u03a0\u03b1\u03c1\u03b1\u03b4\u03b5\u03af\u03b3\u03bc\u03b1\u03c4\u03b1 \u03c3\u03c7\u03b5\u03b4\u03af\u03b1\u03c3\u03b7\u03c2 \u03b3\u03b9\u03b1 \u03c3\u03c4\u03b1\u03b8\u03b5\u03c1\u03ac \u03ba\u03b1\u03b9 \u03ba\u03b9\u03bd\u03b7\u03c4\u03ac \u03c3\u03c5\u03c3\u03c4\u03ae\u03bc\u03b1\u03c4\u03b1 \u03b4\u03bf\u03c1\u03c5\u03c6\u03bf\u03c1\u03b9\u03ba\u03ce\u03bd \u03b5\u03c0\u03b9\u03ba\u03bf\u03b9\u03bd\u03c9\u03bd\u03b9\u03ce\u03bd.<\/li>\n\n\n \t\n\n<li>\u03a4\u03b5\u03c7\u03bd\u03b9\u03ba\u03ad\u03c2 \u03c0\u03bf\u03bb\u03bb\u03b1\u03c0\u03bb\u03ae\u03c2 \u03c0\u03c1\u03cc\u03c3\u03b2\u03b1\u03c3\u03b7\u03c2 \u03c3\u03c4\u03b1 \u03b4\u03bf\u03c1\u03c5\u03c6\u03bf\u03c1\u03b9\u03ba\u03ac \u03b4\u03af\u03ba\u03c4\u03c5\u03b1 (TDMA, FDMA, CDMA). \u0394\u03af\u03ba\u03c4\u03c5\u03b1 VSATs, \u03c4\u03bf\u03c0\u03bf\u03bb\u03bf\u03b3\u03af\u03b5\u03c2 \u03ba\u03b1\u03b9 \u03b1\u03c1\u03c7\u03b9\u03c4\u03b5\u03ba\u03c4\u03bf\u03bd\u03b9\u03ba\u03ad\u03c2 \u03c3\u03c5\u03c3\u03c4\u03b7\u03bc\u03ac\u03c4\u03c9\u03bd.<\/li>\n\n\n<\/ul>\n\n\n--><br \/>\n<!--more--><br \/>\n<!--\n\n<ul>\n \t\n\n<li>\u0391. \u039a\u03b1\u03bd\u03ac\u03c4\u03b1\u03c2, \u03a6. \u039a\u03c9\u03bd\u03c3\u03c4\u03b1\u03bd\u03c4\u03af\u03bd\u03bf\u03c5, \u0393. \u03a0\u03ac\u03bd\u03c4\u03bf\u03c2, \u201c\u0391\u03c3\u03cd\u03c1\u03bc\u03b1\u03c4\u03b5\u03c2 \u0395\u03c0\u03b9\u03ba\u03bf\u03b9\u03bd\u03c9\u03bd\u03af\u03b5\u03c2\u201d, \u0391\u03c5\u03c4\u03bf\u03ad\u03ba\u03b4\u03bf\u03c3\u03b7, 2010.<\/li>\n\n\n \t\n\n<li>\u0394\u03b9\u03b1\u03c6\u03ac\u03bd\u03b5\u03b9\u03b5\u03c2 \u0394\u03b9\u03b1\u03bb\u03ad\u03be\u03b5\u03c9\u03bd<\/li>\n\n\n \t\n\n<li>T. Pratt, C.W. Bostian, J.E. Allnutt, \u0395\u03c0\u03b9\u03c3\u03c4\u03b7\u03bc\u03bf\u03bd\u03b9\u03ba\u03ae \u0395\u03c0\u03b9\u03bc\u03ad\u03bb\u03b5\u03b9\u03b1 \u0391. \u039a\u03b1\u03bd\u03ac\u03c4\u03b1\u03c2, \u201c\u0394\u03bf\u03c1\u03c5\u03c6\u03bf\u03c1\u03b9\u03ba\u03ad\u03c2 \u0395\u03c0\u03b9\u03ba\u03bf\u03b9\u03bd\u03c9\u03bd\u03af\u03b5\u03c2\u201d, 2\u03b7 \u0388\u03ba\u03b4\u03bf\u03c3\u03b7, \u0395\u03ba\u03b4\u03cc\u03c3\u03b5\u03b9\u03c2 \u03a0\u03b1\u03c0\u03b1\u03c3\u03c9\u03c4\u03b7\u03c1\u03af\u03bf\u03c5, 2009<\/li>\n\n\n \t\n\n<li>\u03a3\u03c5\u03c3\u03c4\u03ac\u03c3\u03b5\u03b9\u03c2 \u03c4\u03b7\u03c2 ITU-R<\/li>\n\n\n \t\n\n<li>G. Maral, M. Bousquet, \u201cSatellite Communications Systems\u201d, John Wiley &amp; Sons, 4th Edition, 2002.<\/li>\n\n\n \t\n\n<li>C. Balanis, \u201cAntenna Theory Analysis and Design\u201d, 2nd Edition, John Wiley &amp; Sons, 2005.<\/li>\n\n\n \t\n\n<li>T. Rappaport, \u201cWireless Communications\u201d, 2nd edition, Prentice Hall, 2002.<\/li>\n\n\n \t\n\n<li>\u201cPropagation of Radiowaves\u201d, Les Barclay, 2nd Edition, IEE, 2002.<\/li>\n\n\n<\/ul>\n\n\n--><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u03a3\u03c4\u03cc\u03c7\u03bf\u03c2 \u03a3\u03c4\u03cc\u03c7\u03bf\u03c2 \u03c4\u03bf\u03c5 \u03bc\u03b1\u03b8\u03ae\u03bc\u03b1\u03c4\u03bf\u03c2 \u03b5\u03af\u03bd\u03b1\u03b9 \u03b7 \u03b5\u03bc\u03b2\u03ac\u03b8\u03c5\u03bd\u03c3\u03b7 \u03c4\u03c9\u03bd \u03c6\u03bf\u03b9\u03c4\u03b7\u03c4\u03ce\u03bd \u03c3\u03b5 \u03b8\u03ad\u03bc\u03b1\u03c4\u03b1 \u03b1\u03c3\u03cd\u03c1\u03bc\u03b1\u03c4\u03c9\u03bd \u03b5\u03c0\u03b9\u03ba\u03bf\u03b9\u03bd\u03c9\u03bd\u03b9\u03ce\u03bd \u03bc\u03b5 \u03ad\u03bc\u03c6\u03b1\u03c3\u03b7 \u03c3\u03c4\u03b9\u03c2 \u03c4\u03b5\u03c7\u03bd\u03b9\u03ba\u03ad\u03c2 \u039c\u0399\u039c\u039f \u03b3\u03b9\u03b1 \u03b5\u03c0\u03af\u03b3\u03b5\u03b9\u03b1 \u03ba\u03b1\u03b9 \u03b4\u03bf\u03c1\u03c5\u03c6\u03bf\u03c1\u03b9\u03ba\u03ac \u03c3\u03c5\u03c3\u03c4\u03ae\u03bc\u03b1\u03c4\u03b1 \u03b5\u03c0\u03b9\u03ba\u03bf\u03b9\u03bd\u03c9\u03bd\u03b9\u03ce\u03bd. \u03a4\u03bf \u03bc\u03ac\u03b8\u03b7\u03bc\u03b1 \u03c0\u03b5\u03c1\u03b9\u03bb\u03b1\u03bc\u03b2\u03ac\u03bd\u03b5\u03b9 \u03b4\u03cd\u03bf \u03b5\u03bd\u03cc\u03c4\u03b7\u03c4\u03b5\u03c2. \u03a3\u03c4\u03b7\u03bd \u03c0\u03c1\u03ce\u03c4\u03b7 \u03b5\u03bd\u03cc\u03c4\u03b7\u03c4\u03b1 \u03b3\u03af\u03bd\u03b5\u03c4\u03b1\u03b9 \u03b1\u03bd\u03b1\u03c3\u03ba\u03cc\u03c0\u03b7\u03c3\u03b7 \u03c4\u03c9\u03bd \u03b2\u03b1\u03c3\u03b9\u03ba\u03ce\u03bd \u03b5\u03bd\u03bd\u03bf\u03b9\u03ce\u03bd \u03c4\u03b7\u03c2 \u03c4\u03b5\u03c7\u03bd\u03bf\u03bb\u03bf\u03b3\u03af\u03b1\u03c2 \u03c4\u03c9\u03bd \u03ba\u03b5\u03c1\u03b1\u03b9\u03ce\u03bd \u03c0\u03bf\u03bb\u03bb\u03b1\u03c0\u03bb\u03ce\u03bd \u03b5\u03b9\u03c3\u03cc\u03b4\u03c9\u03bd-\u03c0\u03bf\u03bb\u03bb\u03b1\u03c0\u03bb\u03ce\u03bd \u03b5\u03be\u03cc\u03b4\u03c9\u03bd, \u03b5\u03bd\u03ce \u03c3\u03c4\u03b7 \u03b4\u03b5\u03cd\u03c4\u03b5\u03c1\u03b7 \u03b5\u03bd\u03cc\u03c4\u03b7\u03c4\u03b1 \u03b3\u03af\u03bd\u03b5\u03c4\u03b1\u03b9 \u03b1\u03bd\u03b1\u03c3\u03ba\u03cc\u03c0\u03b7\u03c3\u03b7 \u03c4\u03b7\u03c2 \u03c4\u03b5\u03c7\u03bd\u03bf\u03bb\u03bf\u03b3\u03af\u03b1\u03c2 \u03c4\u03c9\u03bd \u0394\u03bf\u03c1\u03c5\u03c6\u03bf\u03c1\u03b9\u03ba\u03ce\u03bd \u0394\u03b9\u03ba\u03c4\u03cd\u03c9\u03bd [&hellip;]<\/p>\n","protected":false},"author":36,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[168,158],"tags":[],"_links":{"self":[{"href":"https:\/\/masters.ds.unipi.gr\/dcomms\/wp-json\/wp\/v2\/posts\/2761"}],"collection":[{"href":"https:\/\/masters.ds.unipi.gr\/dcomms\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/masters.ds.unipi.gr\/dcomms\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/masters.ds.unipi.gr\/dcomms\/wp-json\/wp\/v2\/users\/36"}],"replies":[{"embeddable":true,"href":"https:\/\/masters.ds.unipi.gr\/dcomms\/wp-json\/wp\/v2\/comments?post=2761"}],"version-history":[{"count":11,"href":"https:\/\/masters.ds.unipi.gr\/dcomms\/wp-json\/wp\/v2\/posts\/2761\/revisions"}],"predecessor-version":[{"id":5869,"href":"https:\/\/masters.ds.unipi.gr\/dcomms\/wp-json\/wp\/v2\/posts\/2761\/revisions\/5869"}],"wp:attachment":[{"href":"https:\/\/masters.ds.unipi.gr\/dcomms\/wp-json\/wp\/v2\/media?parent=2761"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/masters.ds.unipi.gr\/dcomms\/wp-json\/wp\/v2\/categories?post=2761"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/masters.ds.unipi.gr\/dcomms\/wp-json\/wp\/v2\/tags?post=2761"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}