Microprocessor Within a PCS

The biggest advantage of PCS over the much familiar cellular phone is that PCS has built-in capabilities for digital data, large displays, and user-friendly entry regularitys. In essence the PCS becomes a communications devise that verges on being a computer (Gilder, 1997).

there is currently hot competition between the two plethoric standards for PCS meshworks: TDMA (time-division multiple access) and CDMA (code-division multiple access). Most existing TDMA is based on the PCS-1900 architecture of GSM (global system for mobile technology), the European digital cellular phone standard used by about one hundred fifty wireless providers in 86 countries (Glossary, 1995). The basic GSM architecture is shown in Exhibit 1.

TDMA uses exclusive narrowband frequency enthrals, subdivided into time slots. TDMA is a method of digital wireless transmission, allowing many users to access, in sequence, a whizz radio frequency channel without interference by allocating ludicrous time slots to to each one user within each channel (see Exhibit 2). Time Division Multiple Access (TDMA) is a method of utilizing radio spectrum. It provides each user access to the broad(a) frequency channel for a brief period, during which the user transmits data. For example, each channel may be sh argond by quartet users by assigning time slot

ASICs (Application Specific Integrated Circuit) are integrated circuits ("chips") which are impost be aftered for specialized applications. Specific combinations of integrated circuit are known as chip sets. The PCS-1900 chip set is in addition known as an ASIC. The PCS-1900 chip set is usually comprised of a radio subsystem, basic memory, keyboard, and a display for a consummate mobile station. Inclusive in the chip set are a algorithm signal central processing unit (ASP), a physical-layer processor (PLP), and the baseboard signal-processing functions (Kempainen, 1996, 65-72).

Voice coding techniques employed with CDMA technology design are the same as in the public network.

Therefore, wireline tonus is assured as well as the transparency necessitate for modem and facsimile transmissions. CDMA networks also provide operators with the ability to trade away capacity and run quality. For example, operators may choose to offer phonation services using voice coding devices which operate at half the normal 32 kpbs ADPCM rate. This would nearly double network capacity and increase revenue potential -- the trade-off is a slightly lower quality, yet very acceptable, voice service offering (CDMA, 1995).

A. PCS and wireless communication market

Glossary. (1995). The wireless world. Interdigital Communication Corporation. [On-line]. on hand(predicate): http://www.interdigital.com/gloss.html.

* standard telephone (DTMF or pulse dial)

The visitant Location Register (VLR) database contains all temporary subscriber breeding needed by the MSC to serve visiting subscribers. The mob Location Register (HLR) database stores and manages subscriptions. It contains all permanent subscriber selective information including the subscriber's service profile, location information, and activity status.

CDMA. (1995). The Wireless World. Interdigital Communication Corporation. [On-line]. purchasable: http://www.interdigital.com/b_cdma.htm

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