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Cripps et al 375/1

Drapac et al 455/38.3

Kaufmann et al 375/1

Abrahamson et al 375/1

Dent 375/1

Gilhousen et al 455/33.1

Dent 379/59

Gilhousen et al 455/33.2

Gilhousen et al 370/209

Gilhousen et al 375/1

Schreiber 375/1

Wieczorek et al 370/311

Dent 375/1

Omura 375/1

Schilling 375/1

Nguyen 455/38.3

Tiedemann, Jr. et al. ... 370/311

FOREIGN PATENT DOCUMENTS

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OTHER PUBLICATIONS

R. Kohno et al. "Adaptive Cancellation of Interference in Direct-Sequence Spread-Spectrum Multiple Access Systems," Proceedings IEEE Global Telecommunications Conference, vol. 1, pp. 630-634 (Nov. 15, 1987. T. Masamura, "Spread Spectrum Multiple Access System with Intrasystem Interference Cancellation," Trans, of the Institute of Electronics and Communication Engineers of Japan, Section E71, No. 3, pp. 224-231 (Mar. 1, 1988). M.K. Varanasi et al., "An Iterative Detector for Asynchronous Spread-Spectrum Multiple-Access Systems," Proceeding IEEE Global Telecommunications Conference, vol. 1, pp. 556-560 (Nov. 28, 1988).

Tzannes, N.S., Communication and Radar Systems, New Jersey; Prentice-Hall, Inc. 1985, pp. 227-239.

Stremler, F.G., Introduction to Communication Systems, Massachusetts Addison-Wesley Publishing Co., 1982, pp. 406-418.

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"Introduction to Spread-Spectrum Antimultipath Tech-
niques and Their Application to Urban Digital Radio," G.
Turin, Proceedings of the IEEE, vol. 68, No. 3, Mar. 1980.
"A Communication Technique for Multipath Channels," R.
Price et al., Proceedings of the IRE, Mar. 1958, pp. 555-570.
"Fading Channel Communications," P. Montes, IEEE Com-
munications Magazine, Jan. 1980, pp. 16-25.
Proakis, JG, Digital Communications, New York:
McGraw-Hill 1989, pp. 728-739.

"Origins of Spread-Spectrum Communications," Scholtz, IEEE Transactions on Communications, vol. COM-30, No. 5, May 1982, pp. 18-21.

"A Class of Low-Rate Nonlinear Binary Codes," A. Kerdock, Information and Control, vol. 20, pp. 182-187 (1972). MacWilliams, F., The Theory of Error-Correcting Codes, Part I and Part II, New York: North-Holland, 1988, pp. 93-124, 451-465.

"Natural Dyadic, and Sequency Order Algorithms and Processors for the Walsh-Hadamard Transforms," Y. Geadah, IEEE Trans, on Computers, vol. V-26, No. 5, May 1977. "Very Low Rate Convolutional Codes for Maximum Theoretical Performance of Spread-Spectrum Multiple-Access Channels," A. Viterbi, IEEE Journal on Selected Areas in Communications, vol. 8, No. 4, May 1990. "On the Capacity of a Cellular CDMA System," K. Gilhousen, IEEE Trans, on Vehicular Technology, vol. 40, No. 2, May 1991.

Goncalves et al., "A Generalized Serial Approach to Offset QAM-Type Modulations", 6th Mediterranean Electrotechnical Conference vol. 1, May 1991, Ljubljana, Yu, pp. 566-569.

Ronald et al., "A DS Spread Spectrum RAKE Receiver with Narrowband Interference Rejection Capability: Operation in Fading Channels", IEEE Military Communications Conference, vol 3, Oct. 1989, Boston, US, pp. 704-708.

IEEE International Conference on Communications, "Spread Spectrum in a Fading, Interference-Limited Environment," Boston, MA, Jun. 10-14, 1979, pp. 42.5.1-42.5.5.

Copy of Singapore (Austria) Examination Report for Application No. 9602960-8, Apr. 7, 2000.

Copy of European Examination Report prepared for EP Application No. 93 850 072.5-221, Nov. 25, 1997.

* cited by examiner

Primary Examiner—Chi Pham

Assistant Examiner—Ronald Abelson

(74) Attorney, Agent, or Firm—Myers Bigel Sibley &

Sajovec

(57) ABSTRACT

A Code Division Multiple Access (CDMA) communication system which contains a calling channel which is used to inform silent mobiles that they are being called. In the system, the calling channel is chosen to be the strongest overlapping signal so that it reaches mobiles which are located on the cells extreme boundaries. The interference other signals experience because the overlap with the calling channel may be avoided by having the mobiles first demodulate the calling channel signal and then subtract it out before demodulating their own signal.

56 Claims, 7 Drawing Sheets

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