{"id":272,"date":"2016-07-13T16:20:21","date_gmt":"2016-07-13T19:20:21","guid":{"rendered":"https:\/\/sbia.org.br\/lnlm\/?page_id=272"},"modified":"2016-07-13T16:20:21","modified_gmt":"2016-07-13T19:20:21","slug":"vol2-no1-art3","status":"publish","type":"page","link":"https:\/\/sbia.org.br\/lnlm\/publicacoes\/vol2-no1\/vol2-no1-art3\/","title":{"rendered":"Combining modulation diversity and index assignment to improve image VQ for a rayleigh fading channel"},"content":{"rendered":"<p><strong>T\u00edtulo:<\/strong> Combining modulation diversity and index assignment to improve image VQ for a rayleigh fading channel<\/p>\n<p><strong>Autores:<\/strong> Lopes, Waslon Terllizzie Ara\u00fajo; Madeiro, Francisco; Aguiar Neto, Benedito Guimar\u00e3es; Alencar, Marcelo Sampaio de<\/p>\n<p align=\"justify\"><strong>Resumo:<\/strong> Vector quantization (VQ) has been widely used in many image coding systems. However, it is highly sensitive to channel errors, which may lead to very annoying blocking artifacts in the reconstructed images. In the present paper, modulation diversity (MD) is combined with index assignment (IA) by simulated annealing for improving the transmission of vector quantized images over a Rayleigh fading channel: MD is used to reduce the bit error rate while IA is used as an attempt to reduce the visual impact of channel errors.<\/p>\n<p><strong>Palavras-chave:<\/strong> Modulation diversity; Rayleigh fading channel; vector quantization; index assignment; simulated annealing; image transmission<\/p>\n<p><strong>P\u00e1ginas:<\/strong> 12<\/p>\n<p><strong>C\u00f3digo DOI:<\/strong> <a href=\"http:\/\/dx.doi.org\/10.21528\/lnlm-vol2-no1-art3\">10.21528\/lmln-vol2-no1-art3<\/a><\/p>\n<p><strong>Artigo em PDF:<\/strong> <a href=\"https:\/\/sbia.org.br\/lnlm\/wp-content\/uploads\/sites\/4\/2016\/07\/vol2-no1-art3.pdf\" rel=\"\">vol2-no1-art3.pdf<\/a><\/p>\n<p><strong>Arquivo BibTex:<\/strong> <a href=\"https:\/\/sbia.org.br\/lnlm\/wp-content\/uploads\/sites\/4\/2016\/07\/vol2-no1-art3.bib\" rel=\"\">vol2-no1-art3.bib<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>T\u00edtulo: Combining modulation diversity and index assignment to improve image VQ for a rayleigh fading channel Autores: Lopes, Waslon Terllizzie Ara\u00fajo; Madeiro, Francisco; Aguiar Neto, Benedito Guimar\u00e3es; Alencar, Marcelo Sampaio de Resumo: Vector quantization (VQ) has been widely used in <a href=\"https:\/\/sbia.org.br\/lnlm\/publicacoes\/vol2-no1\/vol2-no1-art3\/\" class=\"read-more\">Read More &#8230;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":251,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-272","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Combining modulation diversity and index assignment to improve image VQ for a rayleigh fading channel - Learning and NonLinear Models<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/sbia.org.br\/lnlm\/publicacoes\/vol2-no1\/vol2-no1-art3\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Combining modulation diversity and index assignment to improve image VQ for a rayleigh fading channel - Learning and NonLinear Models\" \/>\n<meta property=\"og:description\" content=\"T\u00edtulo: Combining modulation diversity and index assignment to improve image VQ for a rayleigh fading channel Autores: Lopes, Waslon Terllizzie Ara\u00fajo; Madeiro, Francisco; Aguiar Neto, Benedito Guimar\u00e3es; Alencar, Marcelo Sampaio de Resumo: Vector quantization (VQ) has been widely used in Read More ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/sbia.org.br\/lnlm\/publicacoes\/vol2-no1\/vol2-no1-art3\/\" \/>\n<meta property=\"og:site_name\" content=\"Learning and NonLinear Models\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. tempo de leitura\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minuto\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/sbia.org.br\/lnlm\/publicacoes\/vol2-no1\/vol2-no1-art3\/\",\"url\":\"https:\/\/sbia.org.br\/lnlm\/publicacoes\/vol2-no1\/vol2-no1-art3\/\",\"name\":\"Combining modulation diversity and index assignment to improve image VQ for a rayleigh fading channel - Learning and NonLinear Models\",\"isPartOf\":{\"@id\":\"https:\/\/sbia.org.br\/lnlm\/#website\"},\"datePublished\":\"2016-07-13T19:20:21+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/sbia.org.br\/lnlm\/publicacoes\/vol2-no1\/vol2-no1-art3\/#breadcrumb\"},\"inLanguage\":\"pt-BR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/sbia.org.br\/lnlm\/publicacoes\/vol2-no1\/vol2-no1-art3\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/sbia.org.br\/lnlm\/publicacoes\/vol2-no1\/vol2-no1-art3\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Browse issues\",\"item\":\"https:\/\/sbia.org.br\/lnlm\/publicacoes\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Learning &#038; 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