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OFDMA: The interface for 4G wireless

Posted: 09 Sep 2008     Print Version  Bookmark and Share

Keywords:OFDMA  4G  3G  ADSL 

Even as third generation (3G) wireless equipment continues deployment, the wireless ecosystem is identifying and designing fourth generation (4G) systems. 3G systems, such as high-speed packet access (HSPA), provide up to around 15-20Mbps downlink and about 5-10Mbps uplink. 4G systems are being designed to support 5 to 10 times those rates with greater than 100Mbps or more in the downlink and over 50Mbps in the uplink.

OFDMA is based on orthogonal frequency division multiplexing. This technology has been around for some time and has been used in ADSL, Wi-Fi (802.11a/g), DVB-H and other high-speed digital transmission systems. It is not surprising that the first foray of OFDM into the cellular wireless world was fixed-access WiMAX 802.16d. This wireless standard has been used to provide high-speed internet access either as a replacement for other access technologies like ADSL or cable, or to provide service in regions where the other access technologies were not deployed.

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