CINXE.COM
Just a moment...
<!DOCTYPE html><html lang="en-US"><head><title>Just a moment...</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=Edge"><meta name="robots" content="noindex,nofollow"><meta name="viewport" content="width=device-width,initial-scale=1"><style>*{box-sizing:border-box;margin:0;padding:0}html{line-height:1.15;-webkit-text-size-adjust:100%;color:#313131;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji}body{display:flex;flex-direction:column;height:100vh;min-height:100vh}.main-content{margin:8rem auto;max-width:60rem;padding-left:1.5rem}@media (width <= 720px){.main-content{margin-top:4rem}}.h2{font-size:1.5rem;font-weight:500;line-height:2.25rem}@media (width <= 720px){.h2{font-size:1.25rem;line-height:1.5rem}}#challenge-error-text{background-image:url(data:image/svg+xml;base64,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);background-repeat:no-repeat;background-size:contain;padding-left:34px}@media (prefers-color-scheme:dark){body{background-color:#222;color:#d9d9d9}}</style><meta http-equiv="refresh" content="120"></head><body class="no-js"><div class="main-wrapper" role="main"><div class="main-content"><noscript><div class="h2"><span id="challenge-error-text">Enable JavaScript and cookies to continue</span></div></noscript></div></div><script>(function(){window._cf_chl_opt={cvId: '3',cZone: "publications.waset.org",cType: 'non-interactive',cRay: '91354950ea33cdde',cH: 'hxpchuck2Wq_1E6MLpE7GoZbJr1ERwes3V6g0ZWGPh0-1739790159-1.2.1.1-ASHfNeRbcPxM_X0AoieeEcIVi8zpKvLCQycW9sVeFjtgVAPkj_4dA15FMeMfrlik',cUPMDTk: "\/search?q=spectrum%20analysis&__cf_chl_tk=2ZD0O4BEmz6VpzM3G6V5JaPlLwsjqTQwthV1DiAA__Q-1739790159-1.0.1.1-m75RZBpPIvFknfrT2N18VKoh_F2T_o7o36qMBogHBMY",cFPWv: 'b',cITimeS: '1739790159',cTTimeMs: '1000',cMTimeMs: '120000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/search?q=spectrum%20analysis&__cf_chl_f_tk=2ZD0O4BEmz6VpzM3G6V5JaPlLwsjqTQwthV1DiAA__Q-1739790159-1.0.1.1-m75RZBpPIvFknfrT2N18VKoh_F2T_o7o36qMBogHBMY",md: "pkwdm9xJCtvLoGSTqFWBcS8C4pRRkB23cftU9s0gnfE-1739790159-1.2.1.1-6kwn8buEMFWMXWuK4RIlIlRkYUqn_GFADb45I2NnhchHGFe3n6Un4hs7Ouj6z4T4CGbGueT5deuX96oiAkJI60DvRvrriXP7qfIrrbfaP1B24wnFhDR29H_lxqlFyb5ZHXAndwGEiC6X0zOe2tm5uO4nTmOlak3zmQZPF0tjvuL3VmMCcrYj2cVuASXmGyJ2St..Gwrq3JFz5r5VhuM8LQpKfXb52JZgrd0FwwlEfTOwybZ14SHrrfBrVK.2ZqfTvVrLq3.mQ3CocELktHL97oFoSFekiZjc8zolxvG4eOP0gcPr._5AGwft8pacrCR_fz2WvOiE6.XloQS.iCHp5lTbJy1.IbS6twvto9bHtA6O2HhSGBiYQWFJxLEAR6EtUFvD4sfMSmYBMgmjm4psteicVxfFdEZr97nhXm89ir98gFDzaO5N6XQSi80UbPNW0XdE5CjC4oAC08JNy.qoaTwXsi_RnK_QwPtIn8T4DopJ7uroPSqBW42do_l__pj83lqYq7fjuEOn1lRC8YBn1bAMIOJ2bVejGYQLkj26sM6B.FWQU2CXNTXRz06JnK94yT2SRoccq5rILQAKcBG__BZGdt0jqMcf.BgI2N3VzdpwONk6uWWf22LmqNCriIlIhJ2RT_rjxlBcglav_RVhxUPgLbc_3Y.pz9nrEwv4hizvm2W.ZDF6NV43cU5J4GsGYK2QHhkLH3x2EqaAHin9zziGydgqcG.zT6YJ3Afu1faYmCeampMEEchWYJXOpcm_gABFfnxITbFG1iHRYmXDinXz1MDOUBHp9YM2Vo.5ELKLaj4WKcFvoy8dnPsminvB8n3hG_CMZ7Q.7pS8J2HfnJocNNpFlFZK4XqbqPFYE3Op_M_sxFaPl1HHCXzltEkxI42qig0OSJOPO7YFoTh2AaSvbpum4GVhde.Po846vKOrpK0kRjpOLllcFZQOS.wVe1UmzLmNH4zXmJ1zCJTPqIYRgTHc5Db3CCnE6oVtHHhK9NECwg6XBPOnEp4H2yHt.kvG_3J55cFrTT3Z2Gn.3HOkFtsNdhHOXRe5e3eQf_cp4NdDszz2yLaD8Axf04UclDRtz1Mxc8viWdMGy.7fzl7A6Ij.PRBO5L1U.uagKw0uNFxbnXRNAUnx5GzLoTwUHbxPPQZFNMEgY0q9IrH7ydFmrqY3DiW5QI7gfnnBUUejT5WAqhmIEJbDrOM9kPDjh34ETv62q2jq77x6u2s_f2CSwT79IIq6ansHhE7OSQ7glnQGeAe6Q8MvQs7posH9TRYsnPT.9sc969EuY4u.rQ4RNQS2gxJYUIcUwy0PlvXO4k4SRPWPHTZyp8TC8lTHzq86nsJ7OFRbyPAhrJa9iUXG5L0YHKLxwselK4SMXfmw0PoHaxx9DkbIzE.jucdo0xtFXe506CRCP_kox2iZUE1NAXv8TQMuntWGmHlR4pdILTqTM4Elt7MVfJrlC2nbtJMkrqEBkhyQdMKehIu3QHI_yNLOZv3WSPguNiGd3WjQBCz1dwu.3IfydRwSftlLTjYxI13u56lEoC.fWTHIN5c5OB61j1fGx5yrmRVmgGt1j.AArXP87hhEUnoqGMtY4hChfz5ZAM1iLPfGXwRef8.1o9pLvkDkKEK7OqTQ_y00Br3dQNdo6RPnIjSJ0qhSXTHDMbqw_FnkWrVnbxqZkkXHwNK0TTxe5kOTjWqx5I8ysvBz17SGHmiE0TWCRkeXMLp6y7xcDCqmdoJliQCL39NJHlZM3G05DCtx77PSO3ho8ykhWq6QAkutupj3og0HhE2DdjkXJ9mQ70sm8nmnOP8eFYZpxllCbhMmFxcHLgpGPnqQ7niYFtbBgHIUy9zqUEZ9eaXAH.zO_NJXHcrYy45_uGTj5lqguRo4qcdZpRo3rBqRcUhL3ko6M17NXaSWSoKoeFYfC6Z9e.pUDMvZEg",mdrd: "aGka1WMsG2oHOFpHasSTenwdKtJnu5A9lO0A9KM.qnk-1739790159-1.2.1.1-ho_sg6fh.n5f69oXUl_euOji.nWBl9hgvAmbYS8v9btK0rcHW900T_1L9vWj6_jXRdw9TZ1Sbl.NG2p2IQR55bSeMTO498WNFpQGjANPkWq7ROnRuQBURECbw2xwng745K2AFNnYSEsry6vylxS4zkdvfdA.iuOwPEoO.rNmDU.yw.u41HbDihsoFTGkcOnFcwdXVanfwrabFvaFQyhRCCNjgBs6HpwX.1H16sDISzVvUCepaSQVFOatdZnErgvOgfeXL6w391aWQmYUXiKRs1TxGpkvMXlLoYVmAqdF.pI_9tUieCXvghz3SRfzmTy1deNE2NOZk.1HkdJOjEYqqvk5A63_dFAwRJj9Juw3J_tCSJy5iE8NXlZK60zDN96yW7EjpMf.cwzeZfMfPIOFRhdSa7wOLvy_ez_Eous7mbajjc3NoA_fzK5J8ef56B0POhvcoQhm_zA8e0.PACvFUOUyVP.goFjsHUX8TCEooA6QD6idDA7suxM9iXNm.z3OKeZ04XbgifK2NXCyhBjemFjujTg6T5lOTRjCT7kg0BTxVGFDvXO.akKzqCFn64ZZUxCUFZtjaJ1n68IuIrl0W6vCReExH5pAw.2gG17LaKFZDLWdkHqVMZtvDiJQTt7q6qs9qRpvxG1HkxYMIDnE3MIA60E4iPdW1P4Gm94AMUjalDJW3SuGE5BKnIfElf_xWbWIF0xboys61lTFn8SEi7jd7JPSgZV4xkItWPHCPgPL5btlmk4zbFuMH0un7TRY7gOEAecf7ZJxJIKEKIw2aSR4ZsB6px9ROSU.BZrVUmcUjTEZneTt4lsPxr2Kxt3GM.j_splGpE.n87DWMBPHfSwdENhCEt4d8qIhEEFpotFXHb2bdlonnrU9KGsAqNi_ry38iq_9GM9sNiswpdJTcLzJYs5usWqO9hzJwhLTLLb6mfgu5_HM1aNF1LNR4QmYB4reJcLpqnOToDcNrXINs7zgUS3tOIUK3Q53I6SJ20c7O63UBUD4TM9_OGaFUCHJKEIRnG4xk4D9PntXp8cC54igAuKDlzzus7DQhmzZhOI9nnCONzEGeiKJ5TCI9wyOq4miTM8096lCt3rLp32XjKVOxGkwIc4PqjzZHa6ooLfMQgyw4vM3X.O.IJIgWjQ0_2bMT5BNTw_X4oM312JayS3mg_cGdbx3G7NHwwPo7H4zyzkqyOtNt.k4Jy.ce.2xuhqO2o1luYUZTaa7nBq6gRM.Se1eqvi6cbpXCv9lSyzeZIVBwa9Y5uEcQg2_3iGP0RDc66wapYgQkQB3vL3rc5oci1GcNAs15YXmoPkmSQVNb9.o9RSohftRns3ZA2YhwE1EZtfnztA9inA.ONu1kj2PHtZ.aSwoJvS0FXWxWt3X1V8jcJ.tSp3ZvO1SxIrkJtD.exoaMeDOfiA5fZoAbMK6KmeF91g4fbOwX5ThLvYO7iP1EboiXnH8UmBQH1nRTFwfArt31E4usE5gdvCfeb9qhcNS66E4OcLShp3qcDb97B6jrCbb3na.vFcOibbbIwIim4odgpMVRMwuAt8yEVAApjMywE2yvevWpuIA9_PMrXM_83ATG09LhKZ7YhPYd9WWb0xT7HiscrlyPvsUmcw1hhKq8c5VYeP1qXEr83aP7.tIdgthRB5rO0jMeLoJrWnwDfxsfIALg9vUnKHJrC3QVb_KIU7jWV4mroPLA.JFZbRroupFBRAAXqR5a_z.IT61m.FMkvAMqhvMJ.x5DLRQVfntqpmXgZh8XAKbID9.QLNmLTYLhFFK7vZhLw5_hH5RJ2oJn7ndYmceu6FHnkPQhQzmJG0EOw9QiUP60LAnnv1tPUxj_RJtNpiXX1C7ADhpGyOSYVYZTS_7mJsdbpLFzEfDi5QnUymxRicvzHIFJBgNGG4pE_Ma1uU554DJfEFuDx9AIxLGIGwHtF39U1MjNKhJAvslzrLE5QYTMCcjSnQ5FOi_7NaHIZFQo1F3"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=91354950ea33cdde';window._cf_chl_opt.cOgUHash = location.hash === '' && location.href.indexOf('#') !== -1 ? '#' : location.hash;window._cf_chl_opt.cOgUQuery = location.search === '' && location.href.slice(0, location.href.length - window._cf_chl_opt.cOgUHash.length).indexOf('?') !== -1 ? '?' : location.search;if (window.history && window.history.replaceState) {var ogU = location.pathname + window._cf_chl_opt.cOgUQuery + window._cf_chl_opt.cOgUHash;history.replaceState(null, null, "\/search?q=spectrum%20analysis&__cf_chl_rt_tk=2ZD0O4BEmz6VpzM3G6V5JaPlLwsjqTQwthV1DiAA__Q-1739790159-1.0.1.1-m75RZBpPIvFknfrT2N18VKoh_F2T_o7o36qMBogHBMY" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>