Multiplex communications – Wide area network – Packet switching
Patent
1991-06-21
1996-10-01
Cain, David C.
Multiplex communications
Wide area network
Packet switching
370 61, 342373, A04J 1500
Patent
active
055616674
ABSTRACT:
A novel band partitioned noise cancellation method and device is disclosed. In the invention, in which main and auxiliary channel data is transformed to the frequency domain by FFT's and then associated by frequency subbands. The noise is then cancelled using a sequence of operations including a commutating Gram-Schmidt canceller, an equivalent linear weight calculator, formation of a weight matrix, conversion of the weights to time domain by an inverse FFT and rotation of the weights. The weights are then combined with the main and auxiliary channel data in a transversal filter network to produce a noise-cancellation residue.
REFERENCES:
patent: 4588255 (1986-05-01), Tur et al.
patent: 4596986 (1986-06-01), Andrews et al.
patent: 4797807 (1989-01-01), Gerlach
patent: 5047784 (1991-09-01), Gerlach et al.
Karl Gerlach, A Systolic, Multiple-Channel, Band-Partitioned Noise Canceller NRL Report 9225, Naval Research Lab. Jun. 14, 1990.
Karl Gerlach, A Numerically Efficient Band-Partitioned Noise Canceller NRL Report 9050, Naval Research Lab. Jun. 29, 1987.
Memorandum dated Apr. 18, 1991, from C. D. Moultree to "Code 3008.2" re NRL Report 9225, by Gerlach.
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