Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2004-06-09
2009-06-30
Fan, Chieh M (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
C375S229000, C375S340000
Reexamination Certificate
active
07555047
ABSTRACT:
A method, apparatus and computer program for detecting an echo signal including interpolating at least one fast Fourier transformed OFDM signal received in the time-domain, interpolating the at least one signal generated by the time-domain interpolation in the frequency-domain, using a time-domain varying bandwidth low pass filter (LPF), with bandwidth that varies in response to a bandwidth control signal, measuring at least one signal to power ratio between a scattered pilot signal of the at least one signal generated by the time-domain interpolation and another scattered pilot signal of the at least one signal generated by the frequency-domain interpolation, and comparing the signal to power ratio to a threshold value to determine a state of an echo signal, and providing the bandwidth control signal with the determined echo state information to adjust the bandwidth of the time-domain LPF, based on the bandwidth control signal.
REFERENCES:
patent: 7212569 (2007-05-01), Clark
patent: 2002/0178195 (2002-11-01), Ryu
patent: 2004/0254969 (2004-12-01), Pisoni
patent: 2005/0259727 (2005-11-01), Benvenuto et al.
patent: WO 03/105432 (2003-06-01), None
patent: WO 03/105432 (2003-12-01), None
Chinese Office Action dated Nov. 7, 2008.
Fan Chieh M
Harness Dickey & Pierce PLC
Joseph Jaison
Samsung Electronics Co,. Ltd.
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