{"id":8840,"date":"2021-08-11T09:00:46","date_gmt":"2021-08-11T17:00:46","guid":{"rendered":"https:\/\/www.linquip.com\/blog\/?p=8840"},"modified":"2023-01-17T05:39:12","modified_gmt":"2023-01-17T13:39:12","slug":"what-is-frequency-division-multiplexing-fdm","status":"publish","type":"post","link":"https:\/\/www.linquip.com\/blog\/what-is-frequency-division-multiplexing-fdm\/","title":{"rendered":"What is Frequency Division Multiplexing &#8211; FDM: A Brief Review"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_83 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.linquip.com\/blog\/what-is-frequency-division-multiplexing-fdm\/#What_is_Frequency_Division_Multiplexing_%E2%80%93_FDM\" >What is Frequency Division Multiplexing &#8211; FDM?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.linquip.com\/blog\/what-is-frequency-division-multiplexing-fdm\/#Frequency_Division_Multiplexing_Working_Principle\" >Frequency Division Multiplexing Working Principle<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.linquip.com\/blog\/what-is-frequency-division-multiplexing-fdm\/#What_Is_Guard_Band\" >What Is Guard Band?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.linquip.com\/blog\/what-is-frequency-division-multiplexing-fdm\/#Frequency_Division_Multiplexing_Diagram\" >Frequency Division Multiplexing Diagram<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.linquip.com\/blog\/what-is-frequency-division-multiplexing-fdm\/#Frequency_Division_Multiplexing_Application\" >Frequency Division Multiplexing Application<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.linquip.com\/blog\/what-is-frequency-division-multiplexing-fdm\/#Frequency_Division_Multiplexing_Advantages\" >Frequency Division Multiplexing Advantages<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.linquip.com\/blog\/what-is-frequency-division-multiplexing-fdm\/#Frequency_Division_Multiplexing_Disadvantages\" >Frequency Division Multiplexing Disadvantages<\/a><\/li><\/ul><\/nav><\/div>\n<p><span style=\"font-weight: 400;\">Nowadays, the exchange of information is an inseparable part of society. With the great advances in communication technologies, communication has become more affordable and faster. A technology that is widely used in telephony, data communications, and audio\/video broadcasting is multiplexing which can combine multiple communication signals for them to traverse an otherwise single signal communication medium simultaneously. This article will discuss <\/span><span style=\"font-weight: 400;\">what Frequency Division Multiplexing &#8211; FDM<\/span><span style=\"font-weight: 400;\"> and its application. Follow this new blog in Linquip to find out more.\u00a0<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_is_Frequency_Division_Multiplexing_%E2%80%93_FDM\"><\/span>What is Frequency Division Multiplexing &#8211; FDM?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Frequency division multiplexing (FDM) is a multiplexing technique that divides the available bandwidth into multiple sub-bands each of which can carry a signal. Therefore, FDM enables concurrent transmissions over a shared communication medium. As another common use, FDM enables the system to send a huge amount of data through several segments transmitted over independent frequency sub-bands.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Frequency_Division_Multiplexing_Working_Principle\"><\/span>Frequency Division Multiplexing Working Principle<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">In FDM, the total bandwidth is divided into a set of frequency bands that do not overlap. Each of these bands is a carrier of a different signal that is generated and modulated by one of the sending devices. The frequency bands are separated from one another by strips of unused frequencies called the guard bands, to prevent overlapping of signals.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The modulated signals are combined using a multiplexer (MUX) in the sending end. The combined signal is transmitted over the communication channel, thus allowing multiple independent data streams to be transmitted simultaneously. At the receiving end, the individual signals are extracted from the combined signal by the process of demultiplexing (DEMUX).<\/span><\/p>\n<p><span style=\"font-weight: 400;\">FDM can be used with analog signals. The spectrum of the FDM signal is illustrated in the figure below.<\/span><\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-8841\" src=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/06\/1-4.jpg\" alt=\"what is Frequency Division Multiplexing - FDM\" width=\"658\" height=\"183\" title=\"\" srcset=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/06\/1-4.jpg 658w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/06\/1-4-300x83.jpg 300w\" sizes=\"(max-width: 658px) 100vw, 658px\" \/><\/p>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_Is_Guard_Band\"><\/span>What Is Guard Band?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">For FDM to work properly, frequency overlap must be avoided. A guard band is a narrow frequency range that separates two ranges of wider frequency. This ensures that simultaneously used communication channels do not experience interference which would result in decreased quality of both transmissions. The guard band is shown in the figure below.<\/span><\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-8842\" src=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/06\/2-3.jpg\" alt=\"what is Frequency Division Multiplexing - FDM\" width=\"468\" height=\"169\" title=\"\" srcset=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/06\/2-3.jpg 468w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/06\/2-3-300x108.jpg 300w\" sizes=\"(max-width: 468px) 100vw, 468px\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Frequency_Division_Multiplexing_Diagram\"><\/span>Frequency Division Multiplexing Diagram<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">The following diagram conceptually represents multiplexing using FDM. It has 4 frequency bands, each of which can carry a signal from 1 sender to 1 receiver. Each of the 4 senders is allocated a frequency band. The four frequency bands are multiplexed and sent via the communication channel. At the receiving end, a demultiplexer regenerates the original four signals as outputs.<\/span><\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-8843\" src=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/06\/3-3.jpg\" alt=\"what is Frequency Division Multiplexing - FDM\" width=\"600\" height=\"245\" title=\"\" srcset=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/06\/3-3.jpg 600w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/06\/3-3-300x123.jpg 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Frequency_Division_Multiplexing_Application\"><\/span>Frequency Division Multiplexing Application<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">The applications of FDM are as follows.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">FDM is commonly used in TV networks.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">FDM is used in Radio Broadcasting. Every Radio Station has its frequency band. When we turn on our radio then signals from all radio stations are coming on our radio. We can choose the frequency band by rotating the knob to connect our radio with a particular radio station.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The first-generation cellular telephone uses FDM.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Frequency Division Multiplexing System is also used in Satelite Communication system. It helps to transmit multiple channels of data in satellite communication.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Frequency Division Multiplexing System is used in the telephone system. FDM helps to transmit multiple phone calls over a single transmission line or a single link.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">In our broadband connection system, FDM is also used. The FDM system is used in Digital Subscriber Line or DSL Modems, which helps to transmit a huge amount of computer data for accessing the Internet over a single transmission line. It is a very important application of FDM.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">FDM is used in stereo Frequency Modulation or FM transmission systems.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">FDM is also used in Amplitude Modulation or AM radio transmission system.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Frequency Division Multiplexing or FDM system is used for multimedia data such as video, audio, image transmission.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">In earlier days, FDM was used in harmonic telegraphy communication systems.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">In earlier days, FDM was used in the cellular telephone system.<\/span><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Frequency_Division_Multiplexing_Advantages\"><\/span>Frequency Division Multiplexing Advantages<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">The important advantages of FDM are given below.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">\u00a0Frequency Division Multiplexing or FDM does not need synchronization but TDM or Time Division Multiplexing needs synchronization. It is an advantage of FDM over TDM.<\/span><\/li>\n<\/ul>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">FDM provides more latency than TDM.<\/span><\/li>\n<\/ul>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The demodulation process in FDM is very easy and simple.<\/span><\/li>\n<\/ul>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Using the FDM system a large amount of data can be transmitted than TDM. It is a great advantage of FDM over TDM.<\/span><\/li>\n<\/ul>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Using the FDM system multimedia data can be transferred with very high efficiency and low noise and distortion.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">FDM system has high reliability.<\/span><\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-8845\" src=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/06\/2-4.jpg\" alt=\"what is Frequency Division Multiplexing - FDM\" width=\"510\" height=\"301\" title=\"\" srcset=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/06\/2-4.jpg 510w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/06\/2-4-300x177.jpg 300w\" sizes=\"(max-width: 510px) 100vw, 510px\" \/><\/p>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Frequency_Division_Multiplexing_Disadvantages\"><\/span>Frequency Division Multiplexing Disadvantages<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Some disadvantages of FDM are given below.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The Frequency Division Multiplexing system needs a carrier wave or carrier signal but the Time Division Multiplexing system does not need a carrier signal.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The circuitry for FDM is complex than TDM. FDM requires more hardware than TDM.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The Frequency Division Multiplexing system extremely expensive.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">There is intermodulation distortion that occurs in FDM.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">There is a need for a large number of system modulators and filters in FDM.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">FDM provides less throughput.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The full bandwidth of a channel cannot be used in the Frequency Division Multiplexing system.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">FDM has not dynamic coordination.<\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">So, now you know the answer to the question \u201c<\/span><span style=\"font-weight: 400;\">what is Frequency Division Multiplexing &#8211; FDM<\/span><span style=\"font-weight: 400;\">?\u201d. If you enjoy this article in Linquip, let us know what you think by leaving a reply in the comment section. We will be more than glad to have your viewpoint on the article. Is there any question we can help you through? Feel free to <a href=\"https:\/\/www.linquip.com\/sign-up?client_redirect=\/\" target=\"_blank\" rel=\"noopener\" data-schema-attribute=\"\">sign up<\/a> on our website where our experts are prepared to provide you with the most professional advice.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h3><b>Buy Equipment or Ask for a Service<\/b><\/h3>\n<p>By using Linquip RFQ Service, you can expect\u00a0to receive quotations from various suppliers across multiple industries and regions.<\/p>\n<p style=\"text-align: center;\"><strong><a href=\"http:\/\/linquip.com\/get-quote?utm_source=blog&amp;utm_medium=content&amp;utm_campaign=product_list&amp;utm_term=product_list&amp;utm_content=rfq\" target=\"_blank\" rel=\"noopener\">Click Here to Request a Quotation From Suppliers and Service Providers<\/a><\/strong><\/p>\n<p><em><strong>Read More In Linquip<\/strong><\/em><\/p>\n<ul>\n<li><span style=\"text-decoration: underline;\"><strong><span style=\"font-family: verdana, geneva, sans-serif; font-size: 10pt;\"><a href=\"https:\/\/www.linquip.com\/blog\/difference-between-fdm-and-tdm\/\" target=\"_blank\" rel=\"noopener\">Difference Between FDM and TDM: Basic Points<\/a><\/span><\/strong><\/span><\/li>\n<li><span style=\"text-decoration: underline;\"><strong><span style=\"font-family: verdana, geneva, sans-serif; font-size: 10pt;\"><a href=\"https:\/\/www.linquip.com\/blog\/what-is-time-division-multiplexing-tdm\/\" target=\"_blank\" rel=\"noopener\">What is Time Division Multiplexing \u2013 TDM: A Basic Guide<\/a><\/span><\/strong><\/span><\/li>\n<li><span style=\"text-decoration: underline;\"><strong><span style=\"font-family: verdana, geneva, sans-serif; font-size: 10pt;\"><a href=\"https:\/\/www.linquip.com\/blog\/what-is-multiplexing-and-their-types\/\" target=\"_blank\" rel=\"noopener\">What is Multiplexing and Their Types? A Complete Guide<\/a><\/span><\/strong><\/span><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Nowadays, the exchange of information is an inseparable part of society. With the great advances in communication technologies, communication has become more affordable and faster. A technology that is widely used in telephony, data communications, and audio\/video broadcasting is multiplexing which can combine multiple communication signals for them to traverse an otherwise single signal communication &#8230;<\/p>\n","protected":false},"author":6,"featured_media":8844,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","footnotes":""},"categories":[21],"tags":[],"class_list":["post-8840","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-electrical-component"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/posts\/8840","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/comments?post=8840"}],"version-history":[{"count":2,"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/posts\/8840\/revisions"}],"predecessor-version":[{"id":25761,"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/posts\/8840\/revisions\/25761"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/media\/8844"}],"wp:attachment":[{"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/media?parent=8840"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/categories?post=8840"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/tags?post=8840"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}