CDMA communication system

Details CDMA communication system CDMA communication system

1993-03-03

1994-09-13

Barron, Jr., Gilberto

Pulse or digital communications

Repeaters

Testing

455 523, 4552761, H04B 704

Patent

active

053475356

ABSTRACT:
A CDMA communication system using a spreading code has a plurality of mobile stations and at least one base station. The mobile stations and the base station are provided with respective receiving sections, each of which has a path diversity function for reducing multipath fading. The base station includes an array antenna having a plurality of integrated antenna elements spaced by a distance substantially equal to one to several wavelengths from each other so as to produce a space diversity effect. A plurality of delay devices are coupled with the respective antenna elements, for applying time delays to signals which pass through the respective antenna elements. The time delay are different from each other by a one symbol period of the spreading code or more.

REFERENCES:
patent: 3633107 (1972-01-01), Brady
patent: 4349914 (1982-09-01), Evans
"Overview of Cellular CDMA", Lee, IEEE Transactions on Vehicular Technology, vol. 40, No. 2, May 1991, pp. 291-302.
"Introduction to Spread-Spectrum Antimultipath Techniques and Their Application to Urban Digital Radio", Turin, Proceedings of the IEEE, vol. 68, No. 3, Mar. 1980, pp. 328-353.
"Propagation Data and Prediction Methods for the Terrestrial Land Mobile Service Using the Frequency Range 30 MHz to 3 GHz", Rep. 567-4, pp. 310-311, 333-334 and 340.
"Correlation Coefficient on Base Station Diversity for Land Mobile Communication Systems", Kozono et al., Japanese Electronics and Communication, vol. J 70-B, No. 4, Apr. 1987, pp. 476-482.

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