Although there is a large market for satellite based

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Unformatted text preview: ipment that are equipped with a modem can transfer data over analog cellular telephone networks. Although the data rates supported by this technology are low (of the order of few Kbps), it is one of the most popular methods for wireless data communications due to the wide availability of modems and analog cellular services. Digital Cellular By using this communication technology, computing equipment can transfer digital data over digital cellular telephone networks without the need for a modem. The various standards available for digital cellular c transmission are 1. Time Division Multiple Access (TDMA), 2. Code Division Multiple Access (CDMA), and 3. Global System for Mobile Communication (GSM). The effective data transfer rate of digital cellular technology is less than that of analog cellular technology. Cellular Digital Packet Data (CDPD) In this method, digital data to be transferred is broken into small packets and inserted into analog cellular telephone networks. The technology employs unused analog channels available in the analog telephone cellular infrastructure. That is, transmitters use a channel for a short transmission burst and release the channel for analog voice links. The effective data rate that can be achieved using this technique is 19.2 Kbps. Mobile Radio Networks The Specialized Mobile Radio (SMR) and Extended Specialized Mobile Radio (ESMR) technologies employ narrow bands for creating mobile radio network infrastructure. Such an infrastructure is primarily used for utility, dispatch, and other service-oriented metropolitan area users. Due to the use of narrow bands, mobile radio networks have limited data rates (of the order of 20 Kbps). Personal Communications Services (PCS) PCS technology is used to offer greater network complexity and lower end-to-end latency in wireless networks. It has two variations. The low-tier PCS is used for microcell coverage for frequency reuse and low-power benefits. On the other hand, the high-tier PCS is used for early digital cellular systems such as GSM, TDMA, and CDMA. It is used for large macrocells of the order of 0.5 and 3.0 kilometers. PCS technology may be use...
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This document was uploaded on 04/07/2014.

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