Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2007-11-27
2007-11-27
Ghayour, Mohammed (Department: 2611)
Pulse or digital communications
Receivers
Interference or noise reduction
C375S346000, C375S227000
Reexamination Certificate
active
10283915
ABSTRACT:
In a digital receiver for receiving COFDM modulated television signals or the like, consecutive samples are compared with a detection threshold and the number of samples having amplitudes greater than the threshold is determined. This is compared with a further threshold and, if the number of such samples exceeds the further threshold, affected samples are blanked to zero. Similarly, an automatic gain control loop is disabled when the samples are blanked. A demodulator forms the difference in phase of pilot carriers from symbol to symbol. If the variance of the phase differences exceeds an averaged value, this indicates the presence of impulsive noise and is used to inhibit signal correction techniques within the demodulator. Noise energy is thus reduced and propagation of effects resulting from impulsive noise from symbol to symbol is substantially reduced.
REFERENCES:
patent: 3840891 (1974-10-01), Hellwarth
patent: 4154980 (1979-05-01), Schmidt et al.
patent: 4353093 (1982-10-01), Durbin et al.
patent: 5507037 (1996-04-01), Bartkowiak et al.
patent: 5586192 (1996-12-01), De Bijl et al.
patent: 5794136 (1998-08-01), Buchwald et al.
patent: 5867539 (1999-02-01), Koslov
patent: 6122332 (2000-09-01), Ogata et al.
patent: 6181714 (2001-01-01), Isaksson et al.
patent: 6317473 (2001-11-01), Stott et al.
patent: 6320918 (2001-11-01), Walker et al.
patent: 6647070 (2003-11-01), Shalvi et al.
patent: 6920194 (2005-07-01), Stopler et al.
patent: 2001/0018331 (2001-08-01), Kuehn
patent: 2007/0030931 (2007-02-01), Arambepola
patent: 0763949 (1997-03-01), None
patent: 0802669 (1997-10-01), None
patent: 1043874 (2000-10-01), None
patent: 1043874 (2000-10-01), None
patent: 1180851 (2002-02-01), None
patent: 0930719 (2005-04-01), None
Sanchez et al., “Impulsive Noise Measurements and Characterization in a UHF Digital TV Channel,”IEEE Transactions of Electromagnetic Compatibility, vol. 41, No. 2, pp. 124-136 (May 1999).
“Summary report of some findings on impulsive interference in DVB-T reception,” Interference Group Summary Report (Oct. 2000).
Blakely , Sokoloff, Taylor & Zafman LLP
Ghayour Mohammed
Williams Lawrence
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