Pulse or digital communications – Receivers
Reexamination Certificate
2006-08-01
2006-08-01
Bocure, Tesfaldet (Department: 2611)
Pulse or digital communications
Receivers
C375S340000, C375S148000
Reexamination Certificate
active
07085332
ABSTRACT:
Method and apparatus for two-user join demodulation in a system having transmit diversity. A receiver includes at least a detector unit and a channel estimation unit, and exploits transmit diversity employed by at least one of two users or transmitters on a channel. Symbol detection and channel estimation are performed in block or batch fashion, or recursively on a symbol-by-symbol basis. Joint detection makes use of transmit diversity by at least one of the transmitting users. Channel estimates can be updated using channel tracking. If the signals from the first user and the second user are asynchronous, detection can be accomplished in part through reference to a pulse-shape component. The receiver may be incorporated into a mobile communication terminal.
REFERENCES:
patent: 5506861 (1996-04-01), Bottomley
patent: 5887035 (1999-03-01), Molnar
patent: 5930289 (1999-07-01), Laakso et al.
patent: 6304618 (2001-10-01), Hafeez et al.
patent: 6477210 (2002-11-01), Chuang et al.
patent: 6707864 (2004-03-01), Kim
patent: 6775260 (2004-08-01), Dabak et al.
patent: 2002/0110108 (2002-08-01), Kim et al.
patent: 2002/0136188 (2002-09-01), Kim
patent: 2003/0189992 (2003-10-01), Nefedov
patent: 2004/0174939 (2004-09-01), Wang
patent: 19818215 (1999-11-01), None
patent: 0993129 (2000-04-01), None
patent: 1133071 (2001-09-01), None
patent: WO 0000/13383 (2000-03-01), None
Cozzo et al., “Joint Channel Estimation and Data Detection in space-time communication” IEEE transaction on Communication vol. 51, No. 8, Aug. 2003, pp. 1266-1270.
Blanz et al., “Smart Antennas for Combined DOA and Joint Channel Estimation in Time-Slotted CDMA Mobile Radio Systems with Joint Detection,” IEEE Transaction on Vehicular Technology Vo., 49, No. 2, Mar. 2000., pp. 293-306.
H. Arslan et al., “Cochannel Interference Suppression with Successive Cancellation in Narrow-Band Systems”,IEEE Communications Letters, 5(2):37-39, Feb. 2001.
S. Alamouti, “A Simple Transmit Diversity Technique for Wireless Communications”,IEEE Journal on Sel. Areas of Comm., 16(8):1451-1458, Oct. 1998.
E. Lindskog et al., “A Transmit Diversity Scheme for Delay Spread Channels”,submitted to ICC'2000. pp. 1-5.
E. Lindskog et al., “Time-Reversal Space-Time Block Coding and Transmit Delay Diversity-Separate and Combined”.Submitted to 34thAnnual Conference on Signals. Systems and Computers.. Oct. 29-Nov. : 2000.
S. Wales, Technique for Cochannel Interference Suppression in TDMA Mobile Radio Systems.IEEE Proc. Comm.142(2), Apr. 1995.
P. Ranta et al., “Co-Channel Interference Canceling Receiver for TDMA Mobile Systems”.IEEE ICC.pp. 17-21, Feb. 1995.
U. Wachsmann et al., “Exploiting the Data-Rate Potential of MIMO Channels: Multi-Stratum Space-Time Coding”,IEEE Veh. Tech. Conf., May 2001.
S. Talwar et al., “Blind Separation of Synchronous Co-Channel Digital Signals Using an Antenna Array-Part I: Algorithms”.IEEE Trans. Signal Processing. 44(5): 1184-1197, May 1996.
S. Talwar et al., “Blind Separation of Synchronous Co-Channel Digital Signals Using an Antenna Array Part II: Performance Analysis”,IEEE Trans. Signal Processing. 45(3): 706-718, Mar. 1997.
A. Naguib, et al., “Increasing Data Rate Over Wireless Channels”.IEEE Signal Processing Magazine. 17(3): 76-92, May 2000.
A. Dabak et al., “Equalization and Multi-user Detection for Space Time Block Coding Based Transmit Diversity (STTD) in Frequency Selective Channels”. InProc. 52nd IEEE Veh Tech Conf., Sep. 24-28, 2000.
M. Varanasi et al., “Multistage Detection in Asynchronous Code-Division Multiple-Access Communications”.IEEE Trans. Comm.38:508-519, Apr. 1990.
R. Mowbray et al., “Increased CDMA System Capacity Through Adaptive Cochannel Interference Regeneration and Cancellation”,Proc Inst. Elec. Eng., pt 1. 139 515-524, Oct. 1992.
R. Konno et al., “Combination of an Adaptive Array Antenna and a Canceller of Interference for Direct-Sequence Spread-Spectrum Multiple-Access System”,IEEE Journal on Sel. Areas of Comm8 675-682 May 1990.
L. Lindbom, Simplified Kalman Estimation fo Fading Mobile Radio Channels: High Performance at Ims Computational Load,In. Proc. Of the Int. Conf. On Acoustics, Speech and Sig. Proc., Apr. 1993.
A. Hafeez et al., “Co-channel Interference Cancellation for D-AMPS Handsets”,In Proc. 49thIEEE Veh. Tech. Conf., May 1999.
A. Radovic et al., “Iterative Algorithms for Joint Data Detection and Delay Estimation for Code Division Multiple Access Communication System”,In Proc. Ann. Allerton Conf. Commun., Control and Computing, Sep./Oct.1999.
K. Giridhar et al., “Nonlinear Techniques for the Joint Estimation of Cochannel Signals”,IEEE Trans. Comm., 45(4):473-483, Apr. 1997.
Steiner et al., “Optimum and Suboptimum Channel Estimation for the Uplink of CDMA Mobile Radio Systems With Joint Detection”,European Transaction on Telecommunications, AEI, Milano, IT, vol. 5. No. 1, (1994) pp. 39-50.
Kocian A., et al., “Interative Joint Ssymbol Detection and Channel Estimation for DS/CDMA Via the Sage Algorithm”,IEEE International Symposium non Personal Indoor and Mobile Radio Communications, vol. 2, (Sep. 18, 2000) pp. 1410-1414.
Bocure Tesfaldet
Ericsson Inc.
Moore & Van Allen PLLC
Phillips Steven B.
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