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IS-95: IS-95 is a digital cellular standard from the United States that uses a Code Division Multiple Access
(CDMA) scheme. In a CDMA system, users share time and frequency resources simultaneously. This
occurs through assigning a distinct digital code to each user. This code is added to the information data
and modulated onto the carrier, using spread spectrum techniques. Although it anticipates providing
significant capacity improvement and increased interference rejection over other digital cellular
standards, IS-95 remains somewhat controversial because of its wide bandwidth requirements.
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PHS: The Personal Handphone System standard was developed in Japan specifically for indoor and
microcell usage.
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UMTS: Universal Mobile Telecommunications System. UMTS is one of the third-generation (3G) mobile
phone technologies. The currently most common form uses W-CDMA as the underlying air interface and
is standardized by the 3GPP. UMTS is the European answer to the ITU IMT-2000 requirements for 3G
cellular radio systems and was designed to succeed GSM.
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USDC: United States Digital Cellular, also known as IS-54 (Interim Standard 54), was developed to replace
the AMPS standard, particularly in urban areas where AMPS did not provide adequate channel capacity.
USDC allows the co-existence of AMPS so that providers can gradually phase out AMPS as needed.
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WiMAX: WiMAX is a wireless industry coalition whose members organized to advance IEEE 802.16
standards for broadband wireless access (BWA) networks. WiMAX 802.16 technology is expected to
enable multimedia applications with wireless connection and, with a range of up to 30 miles, enable
networks to have a wireless last mile solution.
Wi-Fi
The Wi-Fi Alliance is a global, non-profit organization that is responsible for testing and certifying
interoperability of wireless devices.
The Wi-Fi Alliance controls the Wi-Fi Certified logo which is permitted only on compliant equipment,
indicating that the device is interoperable with any other product also showing the logo. The following
illustration shows the Wi-Fi certified logo.
4
Introducing Wireless Networking
E-DOC-CTC-20060609-0001 v2.0
Chapter 1
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