Pulse or digital communications – Transmitters – Antinoise or distortion
Reexamination Certificate
2006-11-07
2006-11-07
Tse, Young T. (Department: 2611)
Pulse or digital communications
Transmitters
Antinoise or distortion
C375S233000
Reexamination Certificate
active
07133465
ABSTRACT:
A precoding circuit for minimizing distortion of an input signal in a communication channel having a compound transfer function in the Z-Domain: H(z)=(1+a1.z−1+a2.z−2+a3.z31 3+ . . . +an.z−n)/(1+b1.z−+b2.z−2+b−3.z−3+ . . . +bp.z−p). A feedback circuit comprises a first FIR filter and a transfer function corresponding to the inverse of a feedforward part of a transfer function of the communication channel. A feedforward circuit comprises a second FIR filter and a transfer function corresponding to the inverse of a feedback part of a transfer function of the communication channel. A first subtracting circuit subtracts a feedback signal of the feedback circuit from a feedforward signal of the feedforward circuit and outputs a difference signal which is added to a transmit end signal by a first adding circuit. The difference signal is also added to the input signal by a second adding circuit, the output from the second adding circuit is fed to a quantizing circuit which outputs a value kM which is subtracted from the input signal by a second subtracting circuit.
REFERENCES:
patent: 5249200 (1993-09-01), Chen et al.
patent: 5265127 (1993-11-01), Betts et al.
patent: 6314135 (2001-11-01), Schneider et al.
patent: 6324220 (2001-11-01), Sellars
patent: 6650698 (2003-11-01), Liau et al.
patent: 2003/0035495 (2003-02-01), Laamanen et al.
patent: 2003/0063680 (2003-04-01), Nedic et al.
M. Sellers, et al. “Stabilized precoder with antenna diversity for wireless LANs” IEEE Transactions on Consumer Electronics, IEEE Inc., New York, US, vol. 45, No. 4, Nov. 1999, pp. 1169-1175, XP002137332.
G. D. Forney, Jr., et al. “Combined Equalization and Coding Using Precoding”, IEEE Communication Magazine IEEE Service Center. Piscataway, N.J., US, vol. 29, No. 12, Dec. 1, 1991, pp. 25-34, XP000287979.
R Fischer et al.; “Signalformung Zur Begrenzung Der Dynamik Bei Der Tomlinson-Harashima-Vercodierung” Vortrage Der ITG-Fachtagung, Munchen, Oct. 26-28, 1994, Berlin, VDE Verlag, DE, vol. No. 130, 1994, pp. 457-466, XP000503821.
Inter-Tel, Inc.
Tse Young T.
Whittington, Esq. Michelle
LandOfFree
Modified Tomlinson-Harashima precoding method circuit for... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Modified Tomlinson-Harashima precoding method circuit for..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modified Tomlinson-Harashima precoding method circuit for... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3652295