Active interference suppressor utilizing recombinant transmultiplexing
First Claim
1. A signal suppression system having an input and an output, a composite signal having desired and undesired signal components being applied to the input, the signal suppression system being adapted to provide an output signal at the output thereof with the undesired component suppressed therein, the signal suppression system including in combination:
- signal cancellation means having inverting and non-inverting inputs and an output;
a first path between the input of the signal suppression system and said signal cancellation means;
said first path providing said composite signal to one of said inverting and non-inverting inputs; and
a second path between the input of the signal suppression system and the other of said inverting and non-inverting inputs of said signal cancellation means, said second path including a transmultiplexer means, said transmultiplexer means being adapted to respond to the undesired component to provide a cancellation signal to said other of said inverting and non-inverting inputs of said signal cancellation means so that said signal cancellation means can suppress said undesired component in the output signal thereof.
3 Assignments
0 Petitions
Accused Products
Abstract
An active signal suppression system utilizes multi-rate recombinant transmultiplexer (56) to suppress or cancel an undesired signal (46) from a wideband composite signal (40) to be applied to an analog to digital converter (20). The transmultiplexer (56) includes a first demultiplexer (88,90), multiplier (100), switch (120), and multiplexer (128,130). The demultiplexer and multiplexer each have a poly phase filter and Fast Fourier Transform pair which permit channelization and facilitate the generation of a cancellation signal (145) for suppression of the undesired signal. Signal cancellation circuit (60) receives the composite signal (40) at one input (70) and the cancellation signal (145) at another input (76). A minimum mean square estimation circuit (MMSE) (158) and a second demultiplexer (145, 146) are included in a feedback circuit to provide error correction. A detector and automatic gain control circuit (138) is coupled to the first demultiplexer (88,90) and the multiplier (100) to detect the undesired signal (46) for controlling the switch and to provide automatic gain control to a variable gain amplifier (214) connected to the signal cancellation circuit.
33 Citations
20 Claims
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1. A signal suppression system having an input and an output, a composite signal having desired and undesired signal components being applied to the input, the signal suppression system being adapted to provide an output signal at the output thereof with the undesired component suppressed therein, the signal suppression system including in combination:
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signal cancellation means having inverting and non-inverting inputs and an output;
a first path between the input of the signal suppression system and said signal cancellation means;
said first path providing said composite signal to one of said inverting and non-inverting inputs; and
a second path between the input of the signal suppression system and the other of said inverting and non-inverting inputs of said signal cancellation means, said second path including a transmultiplexer means, said transmultiplexer means being adapted to respond to the undesired component to provide a cancellation signal to said other of said inverting and non-inverting inputs of said signal cancellation means so that said signal cancellation means can suppress said undesired component in the output signal thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A active signal suppression system having an input and an output, a composite signal having desired and undesired components being applied to the input, the signal suppression system being adapted to suppress the undesired component, the signal suppression system including in combination:
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signal cancellation means having inverting and non-inverting inputs and an output;
a first path between the input of the signal suppression system and said signal cancellation means;
said first path providing said composite signal to one of said inverting and non-inverting inputs;
a second path between the input of the suppression system and the other of said inverting and non-inverting inputs of said cancellation means, said second path including a series arrangement of first circuit means providing said composite signal, demultiplexer means having an input coupled to said first circuit means and having an output including said composite signal, switch means having a control terminal, multiplexer means and second circuit means;
detector means coupled to receive said output of said demultiplexer means;
said detector means being responsive to the existence of said undesired components to provide a control signal to said switch means so that said switch means is responsive to the undesired component to provide a cancellation signal through said multliplexer means and said second circuit means to said other of said inverting and non-inverting inputs of said signal cancellation means so that said cancellation means can suppress said undesired signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 18, 19, 20)
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17. An active wideband signal suppression system for canceling an undesired component from a composite signal having desired and undesired components, the suppression system including in combination:
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signal cancellation circuit having inputs and an output;
first circuit means for applying said composite signal to one of said inputs of said signal cancellation means;
transmultiplexer in a series path coupled to another input of said signal cancellation circuit, said transmultiplexer having a first demultiplexer, a multiplier;
a switch, and a multiplexer;
detector means coupled between said multiplier means and said switch, said detector means providing control signals to enable said transmultiplexer to provide a cancellation signal to said another input; and
a feedback path from said output of said signal cancellation circuit to said multiplier;
said feedback path including a second demultiplexer and a minimum means square estimation circuit for providing a feedback signal which fine tunes the output of the multiplier to optimize said cancellation signal.
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Specification