Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2006-09-22
2008-03-18
Wang, Ted (Department: 2611)
Pulse or digital communications
Receivers
Interference or noise reduction
C370S484000, C704S200000, C708S300000, C708S819000
Reexamination Certificate
active
07346137
ABSTRACT:
A non-uniform filter bank is created by joining sections of oversampled uniform filter bands that are based on complex exponential modulation (as opposed to cosine modulation). Each filter bank handles a given, non-overlapping frequency band. The bands are not of uniform bandwidth, and the filters of different banks have different bandwidths. The frequency bands of the different filter banks cover the frequency of interest with gaps in the neighborhoods of the filter band edges. A set of transition filters fills those gaps.
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A generalized polyphase principle for uniform digital filter banks, Twicken, J.D.; Acoustics, Speech, and Signal Processing, 1988. ICASSP-88., 1988 International Conference on Apr. 11-14, 1988 pp. 1790-1793 vol. 3, Digital Object Identifier 10.1109/ICASSP.1988.196968.
Zoran Cvetkovitc, On Discrete Shotr-Time Fourier Analysis, pp. 2628-2640, vol. 48, No. 9, Sep. 2000, IEEE Transactions on Signal Processing.
R. Bernardini, et al., “Arbitrary Tilings of the Time-Frequency Place Using Local Bases”, IEEE Transactions on Signal Processing, vol. 47, No. 8, Aug. 1999.
H. Bolcskei, et al., “Oversampled Cosine Modulated Filter Banks with Perfect Reconstruction”, IEEE Transactions on Circuits and Systems-II: Analog and Digital Signal Processing, vol. 45, No. 8, Aug. 1998.
AT&T Corp.
Brendzel Henry T.
Wang Ted
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