{"id":345,"date":"2012-11-16T23:29:29","date_gmt":"2012-11-17T01:29:29","guid":{"rendered":"http:\/\/efagundes.com\/openclass_networking\/?page_id=345"},"modified":"2022-01-16T17:50:56","modified_gmt":"2022-01-16T20:50:56","slug":"radio-digital","status":"publish","type":"page","link":"https:\/\/efagundes.com\/networking\/transmissao-sem-fio\/radio-digital\/","title":{"rendered":"R\u00e1dio Digital"},"content":{"rendered":"<p><a href=\"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide93.jpg\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"2444\" data-permalink=\"https:\/\/efagundes.com\/networking\/transmissao-sem-fio\/radio-digital\/slide9-4\/\" data-orig-file=\"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide93.jpg?fit=960%2C720&amp;ssl=1\" data-orig-size=\"960,720\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Slide9\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide93.jpg?fit=960%2C720&amp;ssl=1\" class=\"alignnone size-full wp-image-2444\" src=\"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide93.jpg?resize=960%2C720\" alt=\"Slide9\" width=\"960\" height=\"720\" srcset=\"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide93.jpg?w=960&amp;ssl=1 960w, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide93.jpg?resize=300%2C225&amp;ssl=1 300w\" sizes=\"auto, (max-width: 960px) 100vw, 960px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li>Usa ondas eletromagn\u00e9ticas (r\u00e1dio ou infravermelho) para transmitir informa\u00e7\u00e3o de um ponto a outro, sem necessitar de alguma uma conex\u00e3o f\u00edsica.<\/li>\n<li>Ondas de r\u00e1dio s\u00e3o geralmente referidas como portadoras de r\u00e1dio porque simplesmente fazem a fun\u00e7\u00e3o de entregar energia para um receptor remoto.<\/li>\n<li>O dado a ser transmitido \u00e9 sobreposto a uma portadora de modo a ser corretamente extra\u00eddo pelo receptor. Isto \u00e9 geralmente referido como modula\u00e7\u00e3o da portadora.<\/li>\n<li>Uma vez que o dado \u00e9 sobreposto (modulado) \u00e0 portadora, o sinal de r\u00e1dio ocupa mais de uma freq\u00fc\u00eancia simples, desde que a frequ\u00eancia ou taxa de bits da informa\u00e7\u00e3o da modula\u00e7\u00e3o soma\u2011se com a da portadora.<\/li>\n<li>M\u00faltiplas portadoras podem existem no mesmo espa\u00e7o ao mesmo tempo sem interferir com quaisquer outras, se as ondas de r\u00e1dio s\u00e3o transmitidas em diferentes frequ\u00eancias de r\u00e1dio.<\/li>\n<li>Para extrair os dados, um receptor de r\u00e1dio sintoniza-se em uma freq\u00fc\u00eancia de r\u00e1dio enquanto rejeita todas as outras.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; Usa ondas eletromagn\u00e9ticas (r\u00e1dio ou infravermelho) para transmitir informa\u00e7\u00e3o de um ponto a outro, sem necessitar de alguma uma conex\u00e3o f\u00edsica. Ondas de r\u00e1dio s\u00e3o geralmente referidas como portadoras de r\u00e1dio porque simplesmente fazem a fun\u00e7\u00e3o de entregar energia para um receptor remoto. O dado a ser transmitido \u00e9 sobreposto a uma portadora de [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":329,"menu_order":7,"comment_status":"closed","ping_status":"open","template":"","meta":{"footnotes":""},"class_list":["post-345","page","type-page","status-publish","hentry"],"jetpack_shortlink":"https:\/\/wp.me\/P8yKGp-5z","jetpack-related-posts":[{"id":418,"url":"https:\/\/efagundes.com\/networking\/sistema-telefonico\/tipos-de-modulacao-i\/","url_meta":{"origin":345,"position":0},"title":"Tipos de modula\u00e7\u00e3o (I)","author":"Eduardo Fagundes","date":"17\/11\/2012","format":false,"excerpt":"\u00a0 Para facilitar a transmiss\u00e3o do sinal atrav\u00e9s dos meios f\u00edsicos e adequar as frequ\u00eancias aos sistemas de comunica\u00e7\u00e3o se utiliza o que chamamos de onda portadora, sobre a qual \u00e9 transmitido o sinal com a informa\u00e7\u00e3o. A onda portadora \u00e9 um sinal senoidal caracterizado por tr\u00eas vari\u00e1veis: amplitude, freq\u00fc\u00eancia\u2026","rel":"","context":"Post similar","block_context":{"text":"Post similar","link":""},"img":{"alt_text":"Slide12","src":"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide124.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide124.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide124.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide124.jpg?resize=700%2C400 2x"},"classes":[]},{"id":650,"url":"https:\/\/efagundes.com\/networking\/lans-sem-fio\/802-11-a-camada-fisica\/","url_meta":{"origin":345,"position":1},"title":"802.11: a camada f\u00edsica","author":"Eduardo Fagundes","date":"17\/11\/2012","format":false,"excerpt":"A OFDM (Orthogonal Frequency Division Multiplexing) \u00e9 uma varia\u00e7\u00e3o da multiplexa\u00e7\u00e3o por divis\u00e3o de freq\u00fc\u00eancia (FDM) usada nos sistemas de telefonia e nas tecnologias de redes de acesso como o ADSL e VDSL, e mais recentemente nas redes wireless. A id\u00e9ia b\u00e1sica \u00e9 dividir um fluxo digital de alta taxa\u2026","rel":"","context":"Post similar","block_context":{"text":"Post similar","link":""},"img":{"alt_text":"Slide179","src":"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2012\/11\/Slide179.png?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2012\/11\/Slide179.png?resize=350%2C200 1x, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2012\/11\/Slide179.png?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2012\/11\/Slide179.png?resize=700%2C400 2x"},"classes":[]},{"id":414,"url":"https:\/\/efagundes.com\/networking\/sistema-telefonico\/modulacao-digital\/","url_meta":{"origin":345,"position":2},"title":"Modula\u00e7\u00e3o digital","author":"Eduardo Fagundes","date":"17\/11\/2012","format":false,"excerpt":"O sinal (bit) pode ser enviado basicamente de duas formas: digital e anal\u00f3gica. Para cada caso existem t\u00e9cnicas particulares a serem empregadas. A modula\u00e7\u00e3o constitui-se na t\u00e9cnica empregada para modificar um sinal com a finalidade de transportar uma informa\u00e7\u00e3o atrav\u00e9s do canal de comunica\u00e7\u00e3o e recuperar o sinal, na sua\u2026","rel":"","context":"Post similar","block_context":{"text":"Post similar","link":""},"img":{"alt_text":"Slide11","src":"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide117.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide117.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide117.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide117.jpg?resize=700%2C400 2x"},"classes":[]},{"id":632,"url":"https:\/\/efagundes.com\/networking\/subcamada-de-acesso-ao-meio\/protocolo-csmacd\/","url_meta":{"origin":345,"position":3},"title":"Protocolo CSMA\/CD","author":"Eduardo Fagundes","date":"17\/11\/2012","format":false,"excerpt":"A Ethernet usa um refinamento do protocolo ALOHA, conhecido como Carrier Sense Multiple Access (CSMA) que melhora desempenho quando houver um tr\u00e1fego alto de dados. Quando um NIC tiver dados para transmitir, o NIC escuta o cabo primeiro (usando um transceptor) para ver se existe portadora (sinal) e inicia a\u2026","rel":"","context":"Post similar","block_context":{"text":"Post similar","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide303.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide303.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide303.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide303.jpg?resize=700%2C400 2x"},"classes":[]},{"id":454,"url":"https:\/\/efagundes.com\/networking\/sistema-de-telefonia-movel\/edge\/","url_meta":{"origin":345,"position":4},"title":"EDGE","author":"Eduardo Fagundes","date":"17\/11\/2012","format":false,"excerpt":"O EDGE est\u00e1 relacionado ao aumento da capacidade de transmiss\u00e3o da interface a\u00e9rea no corrente padr\u00e3o GSM. A principal ideia \u00e9 adicionar novas caracter\u00edsticas na rede GSM mantendo compatibilidade com os telefones celulares GSM \/GPRS e com os equipamentos da rede (BSS, BSC, TRAU, MSC, SGSN e GGSN). 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