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High-Tech Dictionary >> Wireless
Word Definition
VSB: Vestigial Sideband
Vestigial sideband (VSB) is a type of amplitude modulation technique that encodes data by varying the amplitude of a single carrier frequency. Portions of one of the redundant sidebands are removed to form a vestigial sideband signal. Television broadcasts (regardless of NTSC, PAL, or SECAM analog video format) use this method if the video is transmitted in AM, due to the enormous bandwidth used. It may also be used in digital transmission, such as the ATSC-standardized 8-VSB. The Milgo 4400/48 modem used vesitigial sideband and phase-shift keying to provide 4800 bit/s transmission over a 1600 Hz channel.
VSELP: Vector Sum Excited Linear Predictive
Vector Sum Excited Linear Predictive (VSELP) is a type of speech coding using an excitation signal generated from three components: the output of a long-term, pitch filter and two codebooks. VSELP was used in the IS-54 standard and operated at a rate of 8 kbps.
WAE: Wireless Application Environment
The Wireless Application Environment (WAE) is the top most level in the Wireless Application Protocol (WAP) suite, which combines both the WWW and Mobile Telephony technologies. WAE provides the operators and service providers an interoperable environment on which they can build applications and services for handheld client devices. WAE includes the micro-browser that contains functionality for using not only WML and WML Script as previously stated, but also Wireless Telephony Application, namely WTA and WTAI -- telephony services and programming interfaces as well as content formats including well-defined data formats, images, phone book records and calendar information.
Walsh Code
Walsh Code is a group of spreading codes having good autocorrelation properties and poor crosscorrelation properties. Walsh codes are the backbone of CDMA systems and are used to develop the individual channels in CDMA. For IS-95, here are 64 codes available. Code 0 is used as the pilot and code 32 is used for synchronization. Codes 1 though 7 are used for control channels, and the remaining codes are available for traffic channels. Codes 2 through 7 are also available for traffic channels if they are not needed. For cdma2000, there exists a multitude of Walsh codes that vary in length to accommodate the different data rates and Spreading Factors of the different Radio Configurations.
WAP Forum
The WAP Forum has consolidated into the Open Mobile Alliance (OMA) and no longer exists as an independent organization.
WAP: Wireless Access Point
A wireless access point (WAP), also known as Access Point (AP), is a device that "connects" wireless communication devices together to create a wireless network. WAPs act as a central transmitter and receiver of WLAN radio signals. Access points used in home or small business networks are generally small, dedicated hardware devices featuring a built-in network adapter, antenna, and radio transmitter. Access points support Wi-Fi wireless communication standards. Many WAPs can be connected together to create a larger network that allows "roaming".
WAP: Wireless Application Protocol
The Wireless Application Protocol (WAP) is a set of specifications, developed by the WAP Forum, that lets developers using Wireless Markup Language build networked applications designed for handheld wireless devices. WAP was designed to work within the constraints of these devices: a limited memory and CPU size, small, monochrome screens, low bandwidth and erratic connections. WAP browsers are intended to be implemented on small mobile devices such as cell phones, pagers, and PDAs. Instead of developing content in HTML and JavaScript, WAP developers use WML and WMLScript.
War chalking
War chalking refers to marking buildings or sidewalks with chalk to show others where it's possible to access an exposed company wireless network. These access points are typically found through war drivin
War driving
War driving (wardriving) is the process of traveling around looking for wireless access point signals that can be used to get network access. Some computer hackers are content to simply map any open, unsecured WLANs they find. Others have adopted the practice of warchalking, tagging nearby pavement to allow others to tap in and steal bandwidth from those hotspots.
WASP: wireless application service provider
Wireless Application Service Provider (WASP) provides hosted wireless applications so that companies will not have to build their own sophisticated wireless infrastructures.
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Tech Word for Today
 Word : DID (Direct Inward Dial)
 Explanation : A customized phone line allowing internal users to directly call within the organization without see
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