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Basics of Wireless Telecommunications
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Introduction to Wireless Telecommunications
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technologies based on TDMA (time division multiple access) and CDMA (code division multiple access) The cellular radio spectrum (range of allowable and available radio frequencies) used for these cellular system technologies is regulated by government agencies in different countries In the United States, cellular service providers are categorized by one of two sets of non-contiguous 25 MHz radio frequency bandwidths PCS service providers are categorized by six sets of noncontiguous bandwidths: three sets of 30-MHz radio frequency bandwidths and three sets of 10-MHz radio frequency bandwidths
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Cellular A-band and B-band Carriers
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The two sets of bandwidths licensed for cellular radio service are known as the A-band and the B-band A-band carriers are cellular service providers originally termed the nonwire line licensees These original licensees are companies that provide cellular service and are not associated with any local wire line telephone company B-band carriers are cellular service providers originally termed the wire line licensees These licensees are companies that provide cellular service and are associated with the local wire line telephone company (ie, the original Regional Bell Operating Company or RBOC) in the area where they provide cellular service The concept of A-band and B-band carriers was devised as part of the Modification of Final Judgment (MFJ) consent decree in 1982 that broke up the AT&T/Bell system monopoly in 1984 The AMPS technology originally developed by Bell Laboratories was given up to the seven RBOCs as part of the compromise to divest them from AT&T The mandated provision to allow two cellular service provider licenses in a given geographic area was designed to provide competition between an independent cellular carrier and the cellular carrier owned by the local wire line carrier Note that the cellular A- and B-band licenses are allowed to support analog or digital radio technologies Figure 11 depicts the cellular radio spectrum licenses in use today
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Basics of Wireless Telecommunications
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Phone Transmit
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Basics of Wireless Telecommunications
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Base Station Transmit
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A band (10 MHz) 333 - 30 KHz channels
B band (10 MHz) 333 - 30 KHz channels
A'' band
A'' band
A' band B' band
transmit groups
(1 MHz) 33 - 30 KHz channels
(15 MHz) 50 - 30 KHz channels
(15 MHz) 83 - 30 KHz channels
(1 MHz) 33 - 30 KHz channels
(15 MHz) 50 - 30 KHz channels
A' band
Figure 11 Cellular licensed frequencies that are in use today The A , B , and A bands were originally set aside for control functions, but can be used for normal traffic
PCS A F-band Carriers
In 1994, the US government publicly auctioned six new sets of nationwide wireless telecommunications licenses These licenses had restrictions on who could own them different from those of the original A and B-band licenses They were no longer limited to what type of carrier could own them (ie, local wire line or independent wireless); rather, restrictions were put on the total number and types of wireless licenses that a single carrier could own in a given market In the US, PCS service providers are categorized by one of three sets of noncontiguous 30-MHz radio frequency bandwidths or one of three sets of noncontiguous 10 MHz radio frequency bandwidths Note that the PCS A- through F-band licenses (see Figure 12) are allowed to support only digital radio technologies, typically operating among cell sizes of much smaller radii than analogous cellular systems Figure 12 depicts the PCS radio spectrum licenses in use today
Frequency Reuse
Cellular frequency licenses provide for each mobile station to occupy 60 kHz of bandwidth (30 kHz for transmission and 30 kHz for reception) within an entire radio frequency (RF) allocation of 25 MHz for each of the two cellular carriers (A and B) in a given area (ie, 125 MHz for transmit and 125 MHz for receive for each carrier) PCS frequency licenses provide for each mobile station to occupy 60 kHz of bandwidth
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