Space-time oversampling and error shaping for coarsely quantized arrays
AssigneeThe Board of Trustees of the University of Illinois
InventorsAndrew Carl Singer, Ryan Michael Corey
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Abstract
Methods and apparatus for shaping and filtering quantization errors conjointly in space and time to produce a higher-precision output in a spatially and temporally oversampled array. A space-time error-shaping array system has an array of sensors, each sensor producing a temporal signal comprising quantized waveforms. A multi-input multiple-output (MIMO) discrete-time filter structure with multiple inputs, each coupled to a sensor of the array of sensors, shapes quantization errors of the array of sensors on the basis of temporal aspects of the quantized waveforms conjointly with spatial aspects of the quantized waveforms.
Claims21
A space-time error-shaping array system comprising:
- a. an array of sensors, characterized by a spatial configuration, each sensor of the array producing a temporal signal comprising quantized waveforms;
- and
- b. a multi-input multiple-output (M1MO) discrete-time filter structure having a plurality of inputs and a plurality of outputs, each input coupled to a sensor of the array of sensors, for shaping quantization errors of the array of sensors on the basis of temporal aspects of the temporal signals conjointly with spatial aspects of the quantized waveforms.
A space-time error-shaping array system comprising:
- a. an array of sensors, characterized by a spatial configuration, each sensor of the array producing a temporal signal comprising quantized waveforms;
- b. a set of mixers for receiving at least one of the temporal signals of quantized waveforms and generating, at a mixer output, bandlimited intermediate frequency (IF) signals;
- and
- c. a MIMO discrete-time filter structure having a plurality of inputs and a plurality of outputs, each input coupled to receive a mixer output, for shaping quantization errors of the array of sensors on the basis of at least one of temporal and spatial aspects of the IF signals.
A method for processing signals derived from a plurality of sensors together constituting an array of sensors, characterized by a spatial configuration, the method comprising:
- a. quantizing the signals derived from each of the plurality of sensors to form a temporal signal comprising quantized waveforms;
- and
- b. in a MIMO discrete-time filter structure, shaping quantization errors in each of the quantized waveforms using feedback on the basis of temporal aspects of the quantized waveforms conjointly with spatial aspects of the quantized waveforms.
Dependencies are inferred from the claim text.