Mobile communications promise personal freedom

Article Abstract:

Mobile communications, particularly in terms of digital cellular telephones and personal communication networks (PCNs), was the area receiving the most attention in the telecommunications industry in 1990. Work continues on definition and design of second-generation car phones for the 900-MHz band for increased capacity and reduced interference. Among the technologies competing to become the channel-accessing standard are time-division multiple access (TDMA), which has a set number of users share a single carrier by being assigned an equal portion of time slots for their information, and code-division multiple access (CDMA), which uses signals made up of a different binary sequence that modulates the carrier. PCNs differ from digital cellular systems in that they can operate independently or interface with the standard telephone network; their design and operation are described.

Telephone communications, exc. radio, Standard, Standardization, Digital communications, Business conditions, Telecommunications, Industry Analysis, Mobile Phones, Telecommunications Industry, Digital Communication, Enhancements, Review of Past Year

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The courage to convert

Article Abstract:

Several professionals present their views on the economic conversion occurring in the defense and aerospace engineering industries. Experts in their own fields, they argue for federal initiatives in the form of tax incentives, clear-cut technology transfer policies, reemployment opportunities, small business support and programs aimed at maintaining the US competitive edge in military and aerospace electronics. Such measures would help the two industries adapt to the commercial world and allow them to concentrate on core capabilities in their research and development efforts. These proposals are espoused by professionals with varied work experiences in the academe, Congress, Dept of Defense, military electronics industry and aerospace industry.

Employment, Employment services, Career development, Engineers, Job security, Conversion, Conversion (Religion), Outlook, National Government, Incentives, Military

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Spread spectrum goes commercial

Article Abstract:

The commercial market is beginning to exploit spread-spectrum radio communications. The military has always favored this technology because it is hard to jam or intercept. Spread-spectrum signals travel over a wide range of frequencies before being collected back to their original frequency by a receiver. The Federal Communications Commission (FCC) approved a two-year demonstration project by Millicom Inc, a cellular telephone company that plans a new spread-spectrum personal communications network (PCN) in Houston and Orlando. The PCN will share the same microwave-radio airwaves used by local electric and gas utilities. The use of spread spectrum will lead to a more efficient use of the frequency spectrum.

Radiotelephone communications, Telecommunications systems, Product introduction, Radio Communication, Pilot Project, New Technique, Millicom International Cellular S.A., MILL, Frequency Multipliers

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