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Spread spectrum radios have primarily been used by the military to combat intentional enemy jamming of radio channels and to hide radio transmissions. Partly because of a 1985 United States Federal Communication Commission (FCC) Part 15.237 ruling and QUALCOMM's proposal for a high capacity spread spectrum code division multiple access (CDMA) system for cellular radios [l], there has been considerable interest in various commercial applications for spread spectrum radios. This paper will examine the use of spread spectrum radios for personal communication services (PCS). Both theoretical and practical issues will be presented to show the overall capacity advantage of spread spectrum CDMA over conventional MITOW band FDMA and TDMA. A specific PCS and wireless PBX system under development by CYLINK will be described.

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