Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1996-04-10
1997-11-25
Tse, Young T.
Pulse or digital communications
Receivers
Interference or noise reduction
375233, 455133, 4552781, H04B 708, H04L 2722
Patent
active
056920180
ABSTRACT:
An interference canceler comprises a first complex multiplier for multiplying a signal recovered from a quadrature modulated carrier by a first correlation value, and a second complex multiplier for multiplying a delayed version of the recovered signal by a second correlation value. The outputs of the multipliers are additively combined in an adder and subtractively combined in a subtractor. The output of the adder is amplified by an AGC amplifier to produce a reference signal representative of the envelope of the adder output. First correlation between the recovered signal and the reference signal is detected and the first correlation value is derived therefrom and second correlation is detected between the delayed version of the recovered signal and the reference signal and the second correlation value is derived therefrom. One of the outputs of the amplifier and the subtractor is selected by a selector. A decision feedback equalizer operates on the output of the selector to produce a decision output and a decision error. The decision error is compared with a threshold value and the selector is controlled depending on whether the decision error is higher or lower than the threshold value.
REFERENCES:
patent: 4281411 (1981-07-01), Bonn et al.
patent: 4328585 (1982-05-01), Monsen
patent: 5285482 (1994-02-01), Sehier et al.
patent: 5335251 (1994-08-01), Onishi et al.
patent: 5349609 (1994-09-01), Tsujimoto
patent: 5398259 (1995-03-01), Tsujimoto
patent: 5424023 (1995-06-01), Tsujimoto
patent: 5424125 (1995-06-01), Tsujimoto
patent: 5425059 (1995-06-01), Tsujimto
Li, M. et al., "Rejection of CW Interference in QPSK Systems Using Decision-Feedback Filters", IEEE Transactions on Communications, vol. COM-31, No. 4, Apr. 1983, pp. 473-483.
NEC Corporation
Tse Young T.
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