Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2008-07-29
2008-07-29
Phu, Phuong (Department: 2611)
Pulse or digital communications
Receivers
Interference or noise reduction
C375S260000, C375S349000, C375S232000
Reexamination Certificate
active
10526476
ABSTRACT:
A loop interference canceller that carries out an adaptive operation of responding to time variations of the phase or level of loop interference wave or key station wave at high speed and with high accuracy and reduces the size of an apparatus. The loop interference canceller of the present invention limits the number of data pieces of the transmission path characteristic estimation section, realizes expansion to the entire band not through interpolation but through 0 insertion in a frequency domain and windowing after time domain transformation to reduce the number of data pieces processed and speed up the adaptive operation of the loop interference canceller, and can thereby realize high trackability for time variations of the phase and level of loop interference wave or key station wave, increase the accuracy of processing inside, perform high accuracy cancellation operation, reduce the circuit scale and achieve an advantageous effect of realizing miniaturization of the apparatus.
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An article by K. Hasumi et al. at pp. 49 to 56 of The Institute of Electronics, Information and Communication Engineers Gijutsu Kenkyu Hokoku, vol. 98, No. 661 (Mar. 16, 1999).
Hamazumi et al., “A Study of Loop Interference Canceller for the Relay Stations in an SFN for Digital Terrestrial Broadcasting,” IEEE, vol. 1, pp. 167-171, published year 2000.
Hayashi Ken'ichiro
Kawai Yoshihito
Kunieda Yoshinori
Suzuki Kazuaki
Yomo Hidekuni
Greenblum & Bernstein P.L.C.
Phu Phuong
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