Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Reexamination Certificate
2007-07-31
2007-07-31
Ghebretinsae, Temesghen (Department: 2611)
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
C375S229000, C375S230000, C375S231000, C375S232000, C375S233000, C375S348000
Reexamination Certificate
active
09989367
ABSTRACT:
A method for identifying and modeling nonlinearities in communications channels, particularly optical communication channels. A channel in general is modeled as a summation of linear and non linear terms having memory. The terms are functions of the input to the channel with respect to time, such as a sequence of input bits to the channel. In one embodiment the most recent input bits are used to access a value in a look up table. The value accessed is compared to an actual value received from the channel. The difference between the value in the table and the actual channel value may be used to correct the value in the table. When the look up table and the channel converge the look up table contains a model of the channel with memory that can model nonlinearities. A nonlinear channel having memory may also be modeled in terms of Volterra Kernels.
REFERENCES:
patent: 4747094 (1988-05-01), Sakaguchi et al.
patent: 5726965 (1998-03-01), Hajjar et al.
patent: 6600794 (2003-07-01), Agarossi et al.
Sands, “Non-linear identification on the digital magnetic recording channel”, Nov. 4-6, 1991, Twenty-Fifth Asilomar Conference on Signals, Systems and Computers. pp. 6-10 vol. 1.
Bellini,“Nonlinear cross talk cancellation for high density optical recording”, 1999, Global Telecommunications Conference, 1999. GLOBECOM '99 vol. 1B,pp. 933-938 vol. 1b.
Agarossi, “An effective Non Linear Receiver for high density optical disk”, IEEE Global Telecommunications Conference, 1998. GLOBECOM 98. The Bridge to Global Integration. IEEE vol. 6, Nov. 8-12, 1998 pp. 3374-3378 vol. 6.
Winters, Jack H. et al., Reducing the Effects of Transmission Impairments in Digital Fiber Optic Systems, IEEE Communications Magazine, Jun. 1993, pp. 68-76.
Kasturia, Sanjay et al., Techniques for High-Speed Implementation of Nonlinear Cancellation, IEEE Journal on Selected Areas in Communications, Jun. 1991, pp. 711-717, vol. 9, No. 5.
Sauer-Greff, W., et al., Maximum-Likelihood Sequence Estimation of Nonlinear Channels in High-Speed Optical Fiber Systems, Slide Presentation Material, Apr. 6, 2001, 29 pages.
Kasper, B.L., Equalization of Multimode Optical Fiber Systems, The Bell System Technical Journal, Sep. 1982, pp. 1367-1388, vol. 61, No. 7, American Telephone and Telegraph Company.
Winters, Jack H. et al., Electrical Signal Processing Techniques in Long-Haul Fiber-Optic Systems, IEEE Transactions on Communications, Sep. 1990, pp. 1439-1453, vol. 38, No. 9.
Humblet, Pierre A., et al., On the Bit Error Rate of Lightwave Systems with Optical Amplifiers, IEEE Journal of Lightwave Technology, Nov. 1991, pp. 1576-1582, vol. 9, No. 11.
Black, William C., Jr., et al., Time Interleaved Converter Arrays, IEEE Journal of Solid-State Circuits, Dec. 1980, pp. 1022-1029, vol. SC-15, No. 6.
Ellersick, William, et al., GAD: A 12-GS/s CMOS 4-bit A/D Converter for an Equalized Multi-Level Link, 1999 Symposium on VLSI Circuits Digest of Technical Papers, pp. 49-52.
Ellersick, William, et al., A Serial-Link Transceiver Based on 8GSample/s A/D and D/A Converters in 0.25 μm CMOS, IEEE International Solid State Circuits Conference, 2001/Session 4/High Speed Digital Interfaces/4.1, 3 pgs.
Yang, Chih-Kong Ken, et al., A Serial-Link Transceiver Based on 8-GSamples/s A/D and D/A Converters in 0.25-μm CMOS, IEEE Journal of Solid-State Circuits, Nov. 2001, pp. 1684-1692, vol. 36, No. 11.
Dally; William J., et al., Transmitter Equalization for 4Gb/s Signalling, Proceedings of Hot Interconnects IV, Palo Alto, 1996, 10 pgs.
Jenq, Yih-Chyun, Digital Spectra of Nonuniformly Sampled Signals: A Robust Sampling Time Offset Estimation Algorithm for Ultra High-Speed Waveform Digitizers Using Interleaving, IEEE Transactions on Instrumentation and Measurement, Feb. 1990, pp. 71-75 vol. 39, No. 1.
Eklund, Jan-Erik, et al., Digital Offset Compensation of Time-Interleaved ADC Using Random Chopper Sampling, IEEE International Symposium on Circuits and Systems, May 2000, pp. 447-450, Geneva, Switzerland.
Fu, Daihong, et al., A Digital Background Calibration Technique for Time-Interleaved Analog-to-Digital Converters, IEEE Journal of Solid-State Circuits, Dec. 1998, pp. 1904-1911, vol. 33, No. 12.
Izzard, M.J., et al., Analog versus Digital Control o a Clock Synchronizer for 3 Gb/s Data with 3.0V Differential ECL, 1994 Symposium on VLSI Circuits Digest of Technical Papers, pp. 39-40.
Jin, Huawen, et al., A Digital-Background Calibration Technique for Minimizing Timing-Error Effects in Time-Interleaved ADC's, IEEE Transactions on Circuits and Systems—II: Analog and Digital Signal Processing, Jul. 2000, pp. 603-613, vol. 47, No. 7.
Conroy, Cormac S.G., et al., An 8-b 85-MS/s Parallel Pipeline A/D Converter in 1- μm CMOS, IEEE Journal of Solid-State Circuits, Apr. 1993, pp. 447-454, vol. 28, No. 4.
T. Thormundsson et al.,Cancellation of Nonlinear Intersymbol Interference in Voiceband Communication Channels, Mar. 1997, pp. 862-865, 0-7803-3905, Engineering Research Institute, University of Iceland.
S. Bellini et al.,Nonlinear Cross Talk Cancellation for High Density Optical Recording, Global Telecommunications Conference—Globecom '99, May 1999, pp. 933-938, O-7803-5796, Politecnico de Milano, Italy.
N. Sands et al.,Non-Linear Identification on the Digital Magnetic Recording Channel, Information Systems Laboratory, Mar. 1991, pp. 6-10, 1058-6393/91, Stanford University, Stanford, CA.
International Search Report, dated Jul. 1, 2002.
Broadcom Corporation
Ghebretinsae Temesghen
Torres Juan Alberto
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