Multiplex communications – Communication over free space – Combining or distributing information via code word channels...
Patent
1995-07-26
1997-03-25
Kizou, Hassan
Multiplex communications
Communication over free space
Combining or distributing information via code word channels...
375200, 375206, H04J 1300
Patent
active
056152094
ABSTRACT:
Orthogonalization techniques are disclosed which can be used, for example, to improve subtration of CDMA signals from a composite spread spectrum signal or to improve detection of CDMA signals from the composite spread spectrum signal. According to exemplary embodiments, a Gram-Schmidt orthogonalization process is used to modify signature sequences which are each associated with a particular CDMA signal in the spread spectrum composite signal. These modified signature sequences can then be used to spread correlations of the original signature sequences in the subtraction process or in the detection process to improve performance. Pre-orthogonalization according to the present invention, eliminates or mitigates multiple access interference.
REFERENCES:
patent: 5099493 (1992-03-01), Zeger et al.
patent: 5101417 (1992-03-01), Richley et al.
patent: 5105435 (1992-04-01), Stilwell
patent: 5151919 (1992-09-01), Dent
patent: 5157686 (1992-10-01), Omura et al.
patent: 5204874 (1993-04-01), Falconer et al.
patent: 5272721 (1993-12-01), Mikoshiba et al.
patent: 5345468 (1994-09-01), Bi
patent: 5345472 (1994-09-01), Lee
patent: 5414699 (1995-05-01), Lee
patent: 5416797 (1995-05-01), Gilhousen et al.
A. J. Viterbi, "Very Low Rate Convolutional Codes for Maximum Theoretical Performance of Spread-Spectrum Multiple-Access Channels," IEEE J. Select. Areas Commun., vol. 8. pp. 641-649, May 1990.
W. L. Brogan, "Modern Control Theory", Englewood Cliffs, NJ: Prentice-Hall, 1982. (Section 4.7).
M. K. Varanasi and B. Aazhang, "Multistage Detection in Asynchronous Code-Division Multiple-Access Communications," IEEE Trans. Commun., vol. 38, pp. 509-519, Apr. 1990.
T. K. Kashihara, "Adaptive Cancellation of Mutual Interference in Spread Spectrum Multiple Access," ICC '80, 1980.
R. Kohno et al., "Combination of an Adaptive Array Antenna and a Canceller of Interference for Direct-Sequence Spread-Spectrum Multiple-Access System," IEEE J. Sel. Areas Commun., vol. 8, pp. 675-682, May 1990.
R. Kohno et al., "An Adaptive Canceller of Co-Channel Interference for Spread Spectrum Multiple-Access Communication Networks in a Power Line", IEEE J. Sel. Areas Commun., vol. 8, pp. 691-699, May 1990.
R. Kohno et al., "Adaptive Cancellation of Interference in Direct-Sequence Spread-Spectrum Multiple Access Systems", Proc. IEEE Global Telecommun. Conf. 1987, vol. 1, pp. 630-634, Nov. 1987.
R. Kohno et al., "Combination of Cancelling Intersymbol Interference and Decoding of Error-Correcting Code," IEE Proc., vol. 113, Pt. F, No. 3, pp. 224-231, Jun. 1986.
T. Masamura, "Spread Spectrum Multiple Access System with Intrasystem Interference Cancellation," Trans. IECE, vol. E71, No. 3, pp. 223-231, Mar. 1988.
Y. C. Yoon et al., "A Spread-Spectrum Multiaccess System with Cochannel Interference Cancellation for Multipath Fading Channels," IEEE J. Sel. Areas Commun., vol. 11, pp. 1067-1075, Sep. 1993.
Ericsson Inc.
Kizou Hassan
Yao Kwang B.
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