Pulse or digital communications – Equalizers – Automatic
Reexamination Certificate
2005-10-04
2005-10-04
Patel, Jay K. (Department: 2637)
Pulse or digital communications
Equalizers
Automatic
C375S259000, C375S295000
Reexamination Certificate
active
06952445
ABSTRACT:
The present invention is a machine or method used in digital communications. Symbols are selected in periodic fashion from at least two different symbol constellations. At least one of the symbol constellations has a non-conjugated second moment not equal to zero. The non-conjugated second moment is a second-order statistic. Symbol selection leads to second-order input statistics having cyclostationary phase, and thus to second-order output statistics having cyclostationary phase. These statistics can be used for low-complexity identification and equalization of both linear and nonlinear channels. The invention allows for low-complexity identification and equalization of linear channels and of nonlinear channels without requiring constant-modulus constellations.
REFERENCES:
patent: 4922506 (1990-05-01), McCallister et al.
patent: 6463099 (2002-10-01), Cao et al.
E. Serpedin & G.B. Giannakis, “Blind Channel Identification and Equalization with Modulation-Induced Cyclostationarity” IEEE Trans. on Signal Processing, vol. 46, No. 7, pp. 1930-1944.
G.B. Giannakis, “Filterbanks for Blind Channel Identification and Equalization,” IEEE Signal Processing Letters, vol. 4, No. 6, pp. 184-187, Jun. 1997.
MK Tsatsanis & GB Giannakis, “Transmitter Induced Cyclostationarity for Blind Channel Equalization,” IEEE Trans. on Signal Processing, vol. 45, No. 7, pp1785-1799.
D. Hatzinakos and CL Nikias, “Blind Equalization Based on Higher-Order Statistics (H.O.S.),” in Blind Deconvolution, ed. S. Haykin, Englewood Cliffs: PTR Prentice Hall, 1994.
L.Tong, G. Xu, and T. Kailath, “Blind Identification and Equalization Based on Second-Order Statistics: A Time Domain Approach,” IEEE Trans. on Information Theory, vol. 40, No. 2, pp. 340-349, Mar. 1994.
CB Papadias and DTM Slock, “Fractionally Spaced Equalization of Linear Polyphase Channels and Related Blind Techniques based on Multichannel Linear Prediction,” IEEE Trans. on Signal Processing, vol. 47, No. 3, pp. 641-654, Mar. 1999.
A. Furuskar, S. Mazur, F. Muller, and H. Olofsson, “EDGE: Enhanced Data Rated for GSM and TDMA/136 Evolution,” IEEE Personal Communications, vol. 6, No. 3, pp. 56-66, Jun. 1999.
D. Boss, K.D. Kammeyer, and T. P. Petermann, “Is Blind Channel Estimation Feasible in Mobile Communication Systems? A Study Based on GSM,” IEEE Journal on Selected Areas in Communications, vol. 16, No. 8, pp. 1479-1492, Oct. 1998.
J.G. Proakis, “Digital Communications,” New York: McGraw Hill, 1995.
R.L. Freeman, “Telecommunications Transmission Handbook,” 4th edition, New York: John Wiley & Sons, 1998.
W.A. Gardner (editor) “Cyclostationarity in Communications and Signal Processing,” New York: IEEE Press, 1994.
JS Bendat, “Nonlinear System Analysis and Identification from Random Data”, New York: John Wiley & Sons, 1990.
Y. Sato, “A Method of Self-Recovering Equalization for Multilevel Amplitude-Modulation Systems,” IEEE Trans. on Communications, vol. COM-23, pp. 679-682, Jun. 1975.
D.N. Godard, “Self-Recovering Equalization and Carrier Tracking in Two Dimensional Data Communication Systems,” IEEE Trans. on Communications, vol. COM28, pp. 1867-1875, Nov. 1980.
JR Treichler & BG Agee, “A New Approach to Multipath Correction of Constant-Modulus Signals,” IEEE Trans. on Acoustics, Speech, & Signal Processing, vol. 31, No. 2, pp. 459-471, Apr. 1983.
J. Gomes & V. Barroso, “Using an RBF Network for Blind Equalization: Design and Performance Evaluation,” Proceedings of ICASSP 1997, pp. 3285-3288.
S.Theodoridis, CFN Cowan, CP Callender, and CMS See, “Schemes for Equalisation of Communication Channels with Nonlinear Impairments,” IEE Proceedings on Communications, vol. 142, No. 3, pp. 165-171, Jun. 1995.
A.M. Saleh, “Frequency Independent and Frequency Dependent Nonlinear Models of TWT Amplifiers,” IEEE Trans. on Communications, vol. COM-29, pp. 1715-1720, Nov. 1981.
D. Dardari, V. Tralli, and A. Vaccari, “A Novel Low Complexity Technique to Reduce Non-linear Distortion Effects in OFDM Systems,” Proceedings of IEEE PIMRC Sep. 1998.
Lugo David B.
Patel Jay K.
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