Project Analog - March 2008 - (Page 21)

fig. 1 a schEmatic rEPrEsEntation of thE validation ProcEss for thE Pct. (multiple inputs, multiple outputs) technology exploits channel multipath to simultaneously transmit multiple data streams on the same frequency. MIMO therefore has the potential to provide spectral efficiency gains which can exceed the classical Shannon Hartley capacity limits! MIMO techniques rely on accurate channel estimation. OFDM (Orthogonal Frequency Division Multiplexing) is a modulation technique that divides the signal into many narrowly spaced carriers. The use of OFDM simplifies the MIMO channel estimation equations as the narrow frequency spacing allows each carrier to be modelled assuming narrowband fading channels. For these reasons the combination of MIMO and OFDM is very attractive for high-speed wireless data. Quality of serviCe in an ip world WiMAX is one of the first wireless standards to be developed on the assumption that the communications world is dominated by IP (Internet Protocol), and it can be used to support all types of services. To address multiple service types the 802.16 standards group has developed the following quality of service category types: • Best Effort (BE) • Unsolicited Grant Service (UGS) • Real-time Polling Service (rtPS) • Extended real-time Polling Service (ertPS) • Non real-time Polling Service (nrtPS) A key factor of the performance of WiMAX technology is how well these QoS categories perform in the presence of multiple service flows on a congested wireless network. ConvergenCe WiMAX technology is intended to be used in both the computing and communication devices. As a result it needs to develop solutions that support the use models and technologies used in both markets. This means supporting different security algorithms, intersystem handover, and idle mode to support voice as well as data services. Contents Viewpoint Wireless Communication Using IrDA® Wireless Design Choices Advanced Communication Solutions for Lighting Analog news Microchip analog page Interface products overview Sample center microchipDIRECT Reference designs/ app notes Technical training 21 · ProjeCt ANALog · mAr 08 http://www.microchip.com http://www.microchip.com/analog http://www.microchip.com/analog http://www.microchip.com/interface http://www.microchip.com/interface http://sample.microchip.com/Default.aspx?testCookies=true http://www.microchipdirect.com/catalogselection.aspx?returnURL=default.aspx http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1469&filter1=function&redirects=appnotes http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1469&filter1=function&redirects=appnotes http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1423

Table of Contents Feed for the Digital Edition of Project Analog - March 2008

Project Analog - March 2008 Contents Viewpoint About Project Analog Sponsor Wireless Communication Using the IrDA® Standard Protocol Wireless Design Choices Advanced Communication Solutions for Lighting Putting 10-GbE PHY Options Into Perspective Ease Into the Flexible CANbus Network Technology and Drivers for Mobile WiMAX Analog News—Analog News from Multiple Sources Enter to Win an iPhone Contact Project Analog Sponsor Treelink Microchip Advanced Parts Selector (MAPS)

Project Analog - March 2008

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