Multiplex communications – Communication over free space – Combining or distributing information via code word channels...
Patent
1997-09-29
2000-01-11
Olms, Douglas W.
Multiplex communications
Communication over free space
Combining or distributing information via code word channels...
370441, 370479, 375206, 375207, 375343, 375346, 380 34, H04B 1707
Patent
active
060143738
ABSTRACT:
A spread-spectrum code division multiple access interference canceler for reducing interference in a direct sequence CDMA receiver having N chip-code channels. The interference canceler includes a plurality of correlators or matched filters, a plurality of spread-spectrum-processing circuits, subtracting circuits, and channel correlators or channel-matched filters. Using a plurality of chip-code signals, the plurality of correlators despreads the spread-spectrum CDMA signal as a plurality of despread signals, respectively. The plurality of spread-spectrum-processing circuits uses a timed version of the plurality of chip-code signals, for spread-spectrum processing the plurality of despread signals, respectively, with a chip-code-signal corresponding to a respective despread signal. For recovering a code channel using an i.sup.th chip-code-signal, the subtracting circuits subtracts from the spread-spectrum CDMA signal, each of the N-1 spread-spectrum-processed-despread signals thereby generating a subtracted signal. The N-1 spread-spectrum-processed-despread signals do not include the spread-spectrum-processed-despread signal of the i.sup.th channel of the spread-spectrum CDMA signal. The channel correlator or channel-matched filter despreads the subtracted signal.
REFERENCES:
patent: 4470138 (1984-09-01), Gutlber
patent: 4901307 (1990-02-01), Gilhousen et al.
patent: 4928274 (1990-05-01), Gilhousen et al.
patent: 5028887 (1991-07-01), Gilmore
patent: 5099493 (1992-03-01), Zeger et al.
patent: 5103459 (1992-04-01), Gilhousen et al.
patent: 5151919 (1992-09-01), Dent
patent: 5218619 (1993-06-01), Dent
patent: 5224122 (1993-06-01), Bruckert
patent: 5237586 (1993-08-01), Bottomley
patent: 5276704 (1994-01-01), Dixon
patent: 5343496 (1994-08-01), Honig et al.
patent: 5353304 (1994-10-01), Mochizuki
patent: 5377225 (1994-12-01), Davis
patent: 5418814 (1995-05-01), Hulbert
patent: 5467368 (1995-11-01), Takeuchi et al.
patent: 5579304 (1996-11-01), Sugimoto et al.
S. Moshavi, E. Kanterakis, and D. Schilling, "Multistage Linear Receivers for DS-CDMA Systems," (1994), (unpublished Ph.D. dissertation, City University of New York).
H.V. Poor and S. Verdu, "Single-User Detectors for Multiuser Channels," IEEE Tans. Commun., vol. 36, No. 1, pp. 50-60, Jan. 1988.
A.M. Monk, M. Davis, L.B. Milstein, and C.W. Helstrom, "A Noise-Whitening Approach to Multiple Access Noise Rejection-Part I: Theory and Background," IEEE J. Select. Areas Commun., vol. 12, No. 5, pp. 817-827, Jun. 1994.
M. Rupf, F. Tarkoy, and J.L. Massey, "User-Separating Demodulation for Code-Divisoin Multiple-Access Systems," IEEE J. Select. Aras Commun., vol. 12, No. 5, pp. 786-795, Jun. 1994.
S. Verdu, "Minimum Probability of Error for Asynchronous Gaussian Multiple-Access Channels," IEEE Trans. Inform. Theory, vol. IT-32, No. 1, pp. 85-96, Jan. 1986.
Z. Xie, C.K. Rushforth, and R.T. Short, "Multiuser Signal Detection Using Sequential Decoding," IEEE Trans. Commun., vol. 38, No. 5, pp. 578-583, May 1990.
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, No. 4, pp. 641-649, May 1992.
P. Patel and J. Holtzman, "Analysis of a Simple Successive Interference Cancellation Scheme in a DS/CDMA System," IEEE J. Select. Areas Commun., vol. 12, No. 5, pp. 796-807, Jun. 1994.
S. Kubota, S. Kato, and K. Feher, "Inter-Channel Interference Cancellation Technique for CDMA Mobile/Personal Communication Base Stations," IEEE Int. Symp. Spread Spectrum Tech. Appl (ISSSTA '92), pp. 91-94, Nov. 1992).
P. Dent, B. Gudmundson, and M. Ewerbring, "CDMA-IC: A Novel Code Division Multiple Access Scheme based on Interference Cancellation," Proc. PIMRC, Boston, MA, Oct. 1992, pp. 98-102.
M.K. Varanasi and B. Aazhang, "Multistage Detection in Asynchronous Code-Division Multiple-Access Communications," IEEE Trans. Commun., vol. 38, No. 4, pp. 509-519, Apr. 1990.
R. Kohno, H. Imai, M. Hatori, and S. Pasupathy "An Adaptive Canceller of Cochannel Interference for Spread-Spectrum Multiple-Access Communication Networks in a Power Line," IEEE J. Select. Areas Commun., vol. 8, No. 4, pp. 691-699, May 1990.
Y.C. Yoon, R. Kohno, and H. Imai, "A Spread-Spectrum Multiaccess System with Cochannel Interference Cancellation for Multipath Fading Channels," J. Select. Areas Commun., vol. 11, No. 7, pp. 1067-1075, Sep. 1993.
M.K. Varanasi and B. Aazhang, "Near-Optimum Detection in Synchronous Code-Division Multiple-Access Systems," IEEE Trans. Commun., vol. 39, No. 5, pp. 725-736, May 1991.
D. Divsalar and M.K. Simon, "Improved CDMA Performance using Parallel Interference Cancellation," MILCOM '94, Fort Monmouth, NJ, Oct. 1994.
K.S. Schneider, "Optimum Detection of Code Division Multiplexed Signals," IEEE Trans. Aerospace Electronic. Syst., vol. AES-15, No. 1, pp. 181-185, Jan. 1979.
R. Lupas and S. Verdu, "Linear Multiuser Detectors for Synchronous Code-Division Multiple-Access Channels," IEEE Trans. Inform. Theory, vol. 35, No. 1, pp. 123-136, Jan. 1989.
R. Lupas and S. Verdu, "Near-Far Resistance of Multiuser Detectors in Asynchronous Channels," IEEE Trans. Commun., vol. 38, No. 4, pp. 496-508, Apr. 1990.
Z. Zvonar and D. Brady, "Coherent and Differentially Coherent Multiuser Detectors for Asynchronous CDMA Frequency-Selective Channels," Proc. IEEE MILCOM '92, pp. 442-446.
Z. Xie, R.T. Short, and C.K. Rushforth, "A Family of Suboptimum Detectors for Coherent Multiuser Communications," IEEE J. Select. Areas Commun., vol. 8, No. 4, pp. 683-690, May 1990.
A. Kajiwara and M. Nakagawa, "Microcellular CDMA System with a Linear Multiuser Interference Canceller," IEEE J. Select Areas Commun., vol. 12, No. 4, pp. 605-611, May 1994.
B. Aazhang, B. Paris, and G.C. Orsak, "Neural Networks for Multiuser Detection in Code-Division Multiple-Access Communications," IEEE Trans. Commun., vol. 40, No. 7, pp. 1212-1222, Jul. 1992.
R.A. Iltis and L. Mailaender, "An Adaptive Multiuser Detector with Joint Amplitude and Delay Estimation," IEEE J. Select. Areas Commun., vol. 12, No. 5, pp. 774-785, Jun. 1994.
D.S. Chen and S. Ray, "An Adaptive Multiuser Receiver for CDMA System," IEEE J. Select. Areas Commun., vol. 12, No. 5, pp. 808-816, Jun. 1994.
A. Duel-Wallen, "Decorrelating Decision-Feedback Multiuser Detector for Synchronous Code-Division Multiple-Access Channel," IEEE Trans. Commun., vol. 41, No. 2, pp. 285-290, Feb. 1993.
L. Wei and C. Schlegal, "Synchronous DS-SSMA system with Improved Decorrelating Decision-Feedback Multiuser Detection," IEEE Trans. Veh. Technol., vol. 43, No. 3, pp. 767-772, Aug. 1994.
Jalloul, Louary M.A. and Holtzman, Jack M., "Performance Analysis of DS/CDMA with Noncoherent M-ary Orthogonal Modulation in Multipath Fading Channels," WINLAB, Dept. Of Electrical Engineering, Rutgers, The State University of New Jersey.
Patel, Pulin and Holtzman, Jack, "Analysis of a Simple Successive Interference Cancellation Scheme in DS/CDMA System," WINLAB, Dept. Of Electrical Engineering, Rutgers, The State University of New Jersey.
Kowalski John
Moshavi Shimon
Schilling Donald L.
InterDigital Technology Corporation
Olms Douglas W.
Rao Seema S
LandOfFree
Spread spectrum CDMA subtractive interference canceler system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Spread spectrum CDMA subtractive interference canceler system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spread spectrum CDMA subtractive interference canceler system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1467575