Amplitude cancellation topology for multichannel applications
First Claim
1. A multichannel dynamic range adaptor comprising:
- a multichannel signal input for carrying an input signal with an input bandwidth spanning multiple communication channels; and
a multichannel signal attenuator connected to the multichannel signal input, the multichannel signal attenuator comprising a signal output and a signal attenuation input responsive to an attenuation control signal;
whereby the multichannel signal attenuator is adapted to provide, on the signal output, an output signal corresponding to the input signal reduced in dynamic range in accordance with the attenuation control signal.
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Abstract
A multichannel dynamic range adaptor (102) includes a multichannel signal input (116) for carrying an input signal with an input bandwidth spanning multiple communication channels, and a multichannel signal attenuator (118) connected to the multichannel signal input (116). The multichannel signal attenuator (118) includes a signal output (120) and a signal attenuation input (134) responsive to an attenuation control signal. The multichannel signal attenuator (118) is adapted to provide, on the signal output (120), an output signal corresponding to the input signal reduced in dynamic range in accordance with the attenuation control signal. The output signal dynamic range is generally constrained to be no greater than the dynamic range capability (e.g., 60 dB or less) of an analog to digital (A/D) converter (122) coupled to the multichannel signal attenuator (118) for digitizing the output signal.
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Citations
29 Claims
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1. A multichannel dynamic range adaptor comprising:
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a multichannel signal input for carrying an input signal with an input bandwidth spanning multiple communication channels; and
a multichannel signal attenuator connected to the multichannel signal input, the multichannel signal attenuator comprising a signal output and a signal attenuation input responsive to an attenuation control signal;
whereby the multichannel signal attenuator is adapted to provide, on the signal output, an output signal corresponding to the input signal reduced in dynamic range in accordance with the attenuation control signal. - View Dependent Claims (2, 3, 5, 6, 7, 9, 10, 11)
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4. A multichannel dynamic range adaptor comprising:
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a multichannel signal input for carrying an input signal with an input bandwidth spanning multiple communication channels; and
a multichannel signal attenuator connected to the multichannel signal input, the multichannel signal attenuator comprising a signal output and a signal attenuation input responsive to an attenuation control signal;
whereby the multichannel signal attenuator is adapted to provide, on the signal output, an output signal corresponding to the input signal reduced in dynamic range in accordance with the attenuation control signal;
wherein the multichannel signal attenuator is a reactive power summer.
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8. A multichannel dynamic range adaptor comprising:
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a multichannel signal input for carrying an input signal with an input bandwidth spanning multiple communication channels; and
a multichannel signal attenuator connected to the multichannel signal input, the multichannel signal attenuator comprising a signal output and a signal attenuation input responsive to an attenuation control signal;
whereby the multichannel signal attenuator is adapted to provide, on the signal output, an output signal corresponding to the input signal reduced in dynamic range in accordance with the attenuation control signal;
wherein the attenuation control signal comprises scaled signal information from a prior input signal.
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12. A method for modifying dynamic range of an input signal, the method comprising:
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obtaining an input signal with an input bandwidth spanning multiple communication channels;
coupling the input signal through a multichannel signal attenuator; and
reducing input signal dynamic range in accordance with an attenuation control signal, thereby generating an output signal on a signal output of the multichannel equalizer. - View Dependent Claims (13, 14, 15, 17, 18)
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16. A method for modifying dynamic range of an input signal, the method comprising:
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obtaining an input signal with an input bandwidth spanning multiple communication channels;
coupling the input signal through a multichannel signal attenuator; and
reducing input signal dynamic range in accordance with an attenuation control signal, thereby generating an output signal on a signal output of the multichannel equalizer;
wherein obtaining comprises obtaining a radio frequency input signal with an input bandwidth spanning multiple wireless communication channels.
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19. A method for modifying dynamic range of an input signal, the method comprising:
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obtaining an input signal with an input bandwidth spanning multiple communication channels;
coupling the input signal through a multichannel signal attenuator; and
reducing input signal dynamic range in accordance with an attenuation control signal, thereby generating an output signal on a signal output of the multichannel equalizer;
wherein reducing further comprises reducing input signal dynamic range to be no greater than a predetermined dynamic range;
wherein coupling comprises coupling the input signal through a reactive power summer.
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20. A method for modifying dynamic range of an input signal, the method comprising:
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obtaining an input signal with an input bandwidth spanning multiple communication channels;
coupling the input signal through a multichannel signal attenuator; and
reducing input signal dynamic range in accordance with an attenuation control signal, thereby generating an output signal on a signal output of the multichannel equalizer;
wherein reducing further comprises reducing input signal dynamic range to be no greater than a predetermined dynamic range;
wherein reducing comprises reducing input signal dynamic range in accordance with scaled signal information from a prior input signal.
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21. A multichannel receiver comprising:
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a multichannel signal input for carrying an input signal with an input bandwidth spanning multiple communication channels;
a multichannel signal attenuator connected to the multichannel signal input, the multichannel signal attenuator comprising a signal output and a signal attenuation input responsive to an attenuation control signal;
whereby the multichannel signal attenuator provides on the signal output an output signal corresponding to the input signal reduced in dynamic range in accordance with the attenuation control signal; and
a channelizer coupled to the analog to digital converter and comprising a plurality of recovered-channel outputs. - View Dependent Claims (22, 23, 27, 28, 29)
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24. A multichannel receiver comprising:
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a multichannel signal input for carrying an input signal with an input bandwidth spanning multiple communication channels;
a multichannel signal attenuator connected to the multichannel signal input, the multichannel signal attenuator comprising a signal output and a signal attenuation input responsive to an attenuation control signal;
whereby the multichannel signal attenuator provides on the signal output an output signal corresponding to the input signal reduced in dynamic range in accordance with the attenuation control signal; and
a channelizer coupled to the analog to digital converter and comprising a plurality of recovered-channel outputs;
further comprising a multiplexer coupled to the recovered-channel outputs for providing a summed channel cancellation output signal;
wherein the summed channel cancellation output signal comprises recovered-channel signal data from at least one recovered-channel signal with an output level exceeding a predetermined threshold. - View Dependent Claims (25)
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26. A multichannel receiver comprising:
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a multichannel signal input for carrying an input signal with an input bandwidth spanning multiple communication channels;
a multichannel signal attenuator connected to the multichannel signal input, the multichannel signal attenuator comprising a signal output and a signal attenuation input responsive to an attenuation control signal;
whereby the multichannel signal attenuator provides on the signal output an output signal corresponding to the input signal reduced in dynamic range in accordance with the attenuation control signal; and
a channelizer coupled to the analog to digital converter and comprising a plurality of recovered-channel outputs;
further comprising a multiplexer coupled to the recovered-channel outputs for providing a summed channel cancellation output signal;
wherein the summed channel cancellation output signal comprises recovered-channel signal data from at least two recovered-channel signals, each with an output level exceeding a predetermined threshold.
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Specification