Pulse or digital communications – Receivers
Reexamination Certificate
2006-10-10
2010-02-23
Bocure, Tesfaldet (Department: 2611)
Pulse or digital communications
Receivers
C375S326000, C375S340000
Reexamination Certificate
active
07668260
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: 5867528 (1999-02-01), Verbueken
patent: 5867539 (1999-02-01), Koslov
patent: 5883921 (1999-03-01), Andren et al.
patent: 6122332 (2000-09-01), Ogata et al.
patent: 6181714 (2001-01-01), Isaksson et al.
patent: 6243423 (2001-06-01), Sakoda et al.
patent: 6295382 (2001-09-01), Karanovic
patent: 6320918 (2001-11-01), Walker et al.
patent: 6385261 (2002-05-01), Tsuji et al.
patent: 6577851 (2003-06-01), Ecklund et al.
patent: 6647070 (2003-11-01), Shalvi et al.
patent: 6721373 (2004-04-01), Frenkel et al.
patent: 6920194 (2005-07-01), Stopler et al.
patent: 7302024 (2007-11-01), Arambepola
patent: 7366264 (2008-04-01), Henriksson
patent: 2001/0018331 (2001-08-01), Kuehn
patent: 2003/0022650 (2003-01-01), Tsuji et al.
patent: 2003/0142764 (2003-07-01), Keevill et al.
patent: 2007/0121760 (2007-05-01), Yang et al.
patent: 0763949 (1997-03-01), None
patent: 0802669 (1997-10-01), None
patent: 0930719 (1999-07-01), None
patent: 1043874 (2000-10-01), None
patent: 1180851 (2002-02-01), None
patent: 1180851 (2002-02-01), 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 Summar Report (Oct. 2000).
Blakely , Sokoloff, Taylor & Zafman LLP
Bocure Tesfaldet
Intel Corporation
Williams Lawrence B
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