Inter-symbol interference canceller

Details Inter-symbol interference canceller Inter-symbol interference canceller

2007-10-02

2007-10-02

Ghayour, Mohammed (Department: 2611)

Pulse or digital communications

Receivers

Interference or noise reduction

C375S229000, C375S350000, C375S233000, C375S232000, C455S307000

Reexamination Certificate

active

10493463

ABSTRACT:
The invention relates to a device for cancelling inter-symbol interference in a sampled digital signal. The device comprises a first filter, for which the optimum transfer function is identical to that of the transmission channel, and which receives a sequence of samples ({{tilde over (d)}n}nεN) representative of the digital signal sent to the input of the transmission channel, a subtractor circuit to subtract the first filter output ({{tilde over (d)}′n}nεN) from the sequence of input samples ({rn}nεN), a second filter tuned to the transmission channel, with an optimum transfer function H*(f), to which the output ({en}nεN) from the subtractor circuit is input, and an adder circuit designed to add the output from the second filter to the sequence of samples ({{tilde over (d)}n}nεN) representative of the digital signal sent to the input of the transmission channel, and thus generating a sequence of complex symbols ({n}nεN) without any inter-symbol interference.

REFERENCES:
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patent: 5787131 (1998-07-01), Bottomley
patent: 6307901 (2001-10-01), Yu et al.
patent: 6363104 (2002-03-01), Bottomley
patent: 6717985 (2004-04-01), Poon
patent: 0 833 484 (1998-04-01), None
patent: WO93/22854 (1993-11-01), None
Gersho et al., “Adaptive Cancellation Of Channel Nonlinearities For Data Transmission,” Links for the Future, Amsterdam, International Conference on Communications, Amsterdam, North-Holland, NL, vol. 3, pp. 1239-1242, May 14-17, 1984.
Reed et al., “A Frequency Domain Time-Dependent Adaptive Filter For Interference Rejection,”, IEEE, pp. 0391-0397, 1988.

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