Method and system for down-converting and up-converting an electromagnetic signal, and transforms for same
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Accused Products
Abstract
Methods, systems, and apparatuses, and combinations and sub-combinations thereof, for down-converting and up-converting an electromagnetic (EM) signal are described herein. Briefly stated, in embodiments the invention operates by receiving an EM signal and recursively operating on approximate half cycles (½, 1½, 2½ etc.) of the carrier signal. The recursive operations can be performed at a sub-harmonic rate of the carrier signal. The invention accumulates the results of the recursive operations and uses the accumulated results to form a down-converted signal. In an embodiment, the EM signal is down-converted to an intermediate frequency (IF) signal. In another embodiment, the EM signal is down-converted to a baseband information signal. In another embodiment, the EM signal is a frequency modulated (FM) signal, which is down-converted to a non-FM signal, such as a phase modulated (PM) signal or an amplitude modulated (AM) signal. Up-conversion is accomplished by controlling a switch with an oscillating signal, the frequency of the oscillating signal being selected as a sub-harmonic of the desired output frequency.
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Citations
28 Claims
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1-3. -3. (Cancelled)
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4. A method for down-converting a signal comprising:
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(a) recursively applying a matched filter operation to said signal at a rate sub-harmonically related to said signal;
(b) retaining and accumulating a result of said matched filter operation to provide an initial condition for subsequent recursions of said matched filter operation, wherein said accumulation is approximated as a zero order data hold filter; and
(c) generating a down-converted signal from said accumulated results. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification