ty we get with the same cells within available bandwidth. On the other hand, the more aggressively we reuse channels, the more interference calls will experience. We must manage that in- terference to optimize the number of calls while ensuring satisfactory call quality. The potential of this new technology got the Federal Communications Commission (FCC) of the U.S. government to authorize 60 MHz in the 900-MHz (upper UHF) band for cellular telephones, with 20 MHz given to wireline companies (the Bell System tele- phone companies in those days), 20 MHz assigned to nonwireline companies (other than telephone companies), and 20 MHz held in reserve for future use. Let us add a bit of history from the Bell System Technical Journal (January 1979): "The cellu- lar concept and the realization that small cells with spectrum re-use could increase traffic capac- ity substantially seem to have materialized from nowhere, although both were verbalized in 1947 by D. H. Ring of Bell Laboratories in unpublished work." At Bell Telephone Laboratories, the spark that lit the cellular fire was the 1966 memorandum by Frenkiel and Porter. Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. Analog Wireless Telephony (AMPS) Key Radio Concepts In 1982, Bell Telephone Laboratories prepared a cellular business case for AT&T and Western Electric. Cost and revenue projections were based on a forecast of a million cel- lular telephones by the end of the century, the biggest believable number we could think of at the time. The cellular principle is capacity growth in fixed radio spectrum through frequency reuse and managed interference. Regions of radio coverage, cells, can be made smaller and smaller as needed to accommodate higher density of mobile telephone demand. By the end of 1983, there was commercial cellular service in Japan, Scandinavia, and the United States. As th