Embedded Systems Design Europe - October 2007 - (Page 35)

wireless video The wireless home network offers lots of promise for equipment providers, but they must be able to guarantee QoS. Transporting video BY GIL EPSHTEIN over wireless networks ver the last ﬁve years, wireless data networks and the applications that access them have made our lives more convenient and provided us with precious ﬂexibility. Wireless technologies have become so entrenched in our everyday life that they have now permeated into the home entertainment market. While consumers used to watch DVDs or video clips in front of a stationary TV at a single location in the house, they now want to share and access their growing pool of DVRs, mobile devices, laptops, and other entertainment resources anywhere in the home, at any time. This presents a challenge for today’s developers, which is to provide seamless networking for multimedia and entertainment convergence. Consumers want their wireless network and applications to be just as reliable as if they were wired. Unlike transporting general data over wireless networks, however, video applications can’t tolerate bandwidth ﬂuctuations, so the challenge is signiﬁcantly more rigorous. There are many, many considerations to evaluate when pushing video content through a wireless network. Earlier wireless LAN technologies simply weren’t up to the task, and the industry responded with the most recent IEEE 802.11n speciﬁcation. Even this high-performance WLAN standard, however, isn’t enough for transporting video, and requires supplementary technologies to provide the kind of highquality entertainment experience that consumers demand. A number of critical factors contribute to satisfactory performance as perceived by the consumer. These include bandwidth, latency, breadth of coverage, and quality of service (QoS). Bandwidth is particularly important and is optimized through the use of MIMO (multiple-input multiple-output) and channel-bonding techniques. These O www.embedded.com/europe | embedded systems design europe | OCTOBER 2007 35 035-036-037-038_ESDE.indd 35 10/10/07 10:47:13 http://www.embedded.com/europe

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Embedded Systems Design Europe - October 2007 Contents Linux Set to Dominate Torvalds Updates Linux Kernel ARM Establishes Smart Card Foundry Program Emerson Buys Motorola's Embedded Comms Group LynuxWroks and TTTech to Cooperate on Avionics MontaVista CEO Looks for Acquisitions in Europe Ready: Multiprocessing Technology Provides Opportunity Automotive to Drive MCU Market New Supporters Join COM Express Group Analyst Weighs TI Versus Xilinx Versus PicoChip Cover Feature: Embedded Systems Security Has Moved to the Forefront Trace Exposes the Toughest Real-Time Bugs Employ a Secure Flavor of Linux Use an MCU's Low-Power Modes in Foreground/Background Systems Transporting Video Over Wireless Networks New Products Advertising Contacts

Embedded Systems Design Europe - October 2007

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