Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2006-02-07
2006-02-07
Patel, Jay K. (Department: 2637)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
C375S362000
Reexamination Certificate
active
06996188
ABSTRACT:
A modulator, and demodulator, apparatus and method for use in a multiple sub-channel communication system is taught. A commutator is employed for fractionally sampling, or distributing, signals from, or to, a multiple channel polyphase filter. The filter is coupled with a discrete Fourier transform, or its inverse, such that the relationship between the base-band sampling rate of a plurality of sub-channel signals, the frequency spacing of the sub-channel signals, and the sampling rate of a composite signal can be related by any rational number, thereby freeing designers to optimize system design respecting channel spacing, bandwidth, and signaling rates. The advantages of the present invention are realized by adjusting the interpolation and decimation rates of the filter, and by adjusting the resolution and decimation rates of the transform.
REFERENCES:
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patent: 6005900 (1999-12-01), Zangi
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patent: 2002/0176509 (2002-11-01), Gatherer et al.
Brown Daniel R.
CynTrust Communications, Inc.
Dan Brown Law Office
Ghulamali Qutub
Patel Jay K.
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