Elbowing Into Crowded Airwaves

Backers of an experimental wireless phone system called personal communications network (PCN) say it could someday be even more popular than cellular telephones, because PCN can handle more callers at a lower cost. But finding spare room for PCNs in the crowded radio spectrum isn't easy. New York-based Millicom Inc. hopes to dodge that problem with a technology that blends PCN calls into the background noise of microwave-communications frequencies--without interfering with the calls that already travel by microwave.

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