Gerald L Fudge, Age 63973 Wisperwood Dr, Rockwall, TX 75087

6956517, Oct 18, 2005

Aug 11, 2004

10/916008

E. Scott Baker - Allen TX, US
Gerald L. Fudge - Rockwall TX, US

L-3 Integrated Systems Company - Greenville TX

H03M001/12

341155, 341120, 341118

Systems and methods for analog to digital conversion that may be implemented using a digital to analog converter (DAC) to provide negative feedback to cancel signals at the input of an analog to digital converter (ADC), and that may be used to extend the effective dynamic range of an ADC. The systems and methods may be implemented in multi-channel environments.

7091894, Aug 15, 2006

Jun 12, 2004

10/866532

Gerald L. Fudge - Rockwall TX, US

L-3 Integrated Systems Company - Greenville TX

H03M 1/12

341155, 341120, 341118

Systems and methods for analog to digital conversion that may be implemented using a digital to analog converter (DAC) to provide negative feedback to at least Partially cancel one or more signals (e. g. , one or more interfering signals present with one or more desired signals, one or more strong desired signals, etc. ) at the analog input of an analog to digital converter (ADC), and that may be used to extend the effective dynamic range of an ADC. The effective dynamic range of an ADC may be extended by detecting and isolating signals and using digital adaptive digital filtering along with a digital to analog converter (DAC) to provide negative feedback to cancel the signal/s at the input of the ADC.

7289049, Oct 30, 2007

Aug 21, 2006

11/465826

Gerald Lothair Fudge - Rockwall TX, US
Mark L. Wood - Garland TX, US
Chen-Chu Alex Yeh - Fate TX, US

L3 Communications Integrated Systems L.P. - Greenville TX

H03M 1/10

341123, 702 64

Embodiments of the present invention provide a method and apparatus for compressed sensing. The method generally comprises forming a first compressed sensing matrix utilizing a first set of time indices corresponding to a first sampling rate, forming a second compressed sensing matrix utilizing a plurality of frequencies and a second set of time indices corresponding to a second sampling rate, forming a combined compressed sensing matrix from the first compressed sensing matrix and the second compressed sensing matrix, and reconstructing at least a portion of the input signal utilizing the combined compressed sensing matrix. The first and second sampling rates are each less than the Nyquist sampling rate for the input signal.

7345603, Mar 18, 2008

Nov 7, 2006

11/557164

Mark L. Wood - Garland TX, US
Chen-Chu Alex Yeh - Greenville TX, US
Gerald Lothair Fudge - Rockwall TX, US

L3 Communications Integrated Systems, L.P. - Greenville TX

H03M 1/00

341122, 341123, 341155

Embodiments of the present invention provide a method and apparatus for compressed sensing. In some embodiments, the apparatus () generally includes a receiving element () operable to receive an input signal, an integrate/dump circuit (), a sampling element (), and a processor (). The integrate/dump circuit () is operable to integrate at least a portion of the received signal to provide an integrated signal and the sampling element () is operable to sample the integrated signal at a first sampling rate which is less than the Nyquist rate for the input signal. The processor () is operable to form a compressed sensing matrix utilizing a first set of time indices corresponding to the first sampling rate, form a measurement vector utilizing at least a portion of the sampled signal, and reconstruct at least a portion of the input signal utilizing the compressed sensing matrix and the measurement vector.

7436910, Oct 14, 2008

Oct 10, 2006

11/545310

Gerald L. Fudge - Rockwall TX, US
James E. Harvey - Heath TX, US
Mark A. Chivers - McKinney TX, US
Sujit Ravindran - Dallas TX, US

L-3 Communications Integrated Systems, L.P. - Greenville TX

H03D 1/00

375340

Reconfigurable direct radio frequency (RF) bandpass sampling receivers are disclosed that utilize analog interpolation filters to improve performance. The addition of the analog interpolation filter to the bandpass sampling receiver allows the quantization clock to be de-coupled from the RF sampling clock. As such, the quantization can be performed at a much slower rate than the initial RF sampling allowing the final analog bandwidth to be much narrower than the bandwidth of the first stage filter located before the high-speed sampler. The combination of a tunable bandpass filter, tunable bandpass sample clock and analog interpolation filter followed by a further stage of sampling and quantization at a slower rate than the bandpass sample clocking, therefore, provides significant advantageous by de-coupling the quantization sample rate from the high-speed sample rate. If desired, the analog interpolation filter may also be tunable. Other variations and implementations are also described.

7436911, Oct 14, 2008

Oct 10, 2006

11/545641

Gerald L. Fudge - Rockwall TX, US
James E. Harvey - Heath TX, US
Mark A. Chivers - McKinney TX, US
Sujit Ravindran - Dallas TX, US

L-3 Communications Integrated Systems L.P. - Greenville TX

H03D 1/00

375340

Nyquist folded bandpass sampling receivers are disclosed that utilize narrow band filters in parallel with wideband filters to enhance reception of ultra wideband (UWB) pulses. The addition of the narrow band filter facilitates the reception of ultra wideband signal pulses and, therefore, extends the Nyquist folding bandpass sampling receiver to allow improved processing of ultra wideband (UWB) pulses. RF sampling circuitry utilizing a modulated sampling clock signal can then better capture UWB pulse signals.

7436912, Oct 14, 2008

Oct 10, 2006

11/545642

Gerald L. Fudge - Rockwall TX, US
James E. Harvey - Heath TX, US
Mark A. Chivers - McKinney TX, US
Sujit Ravindran - Dallas TX, US

L-3 Communications Integrated Systems L.P. - Greenville TX

H03D 1/00

375340

Nyquist folded bandpass sampling receivers are disclosed that utilize wideband filters and modulated sampling clocks to identify received signals. In operation, multiple Nyquist zones are allowed to fold on top of each other during sampling. Because the RF sampling clock is modulated, separate frequency modulations can be induced within each Nyquist zone. The signals that are folded together from different Nyquist zones can then be identified and distinguished. In particular, when the Nyquist zones fold on top of each other, the different signals from different Nyquist zones can be separated and identified based on the fact that the added modulation is different for each Nyquist zone. Thus, by using one or more clock modulations to induce frequency modulations that are Nyquist zone dependent, multiple Nyquist zones can be aliased together while still allowing for signals from different Nyquist zones to be separated and identified. Other variations and implementations are also described.

7489745, Feb 10, 2009

Oct 11, 2005

11/247338

Gerald L. Fudge - Rockwall TX, US

L-3 Communications Integrated Systems L.P. - Greenville TX

H03K 9/00
H04L 27/00

375340, 375355

Reconfigurable direct radio frequency (RF) bandpass sampling receivers are disclosed that provide direct RF sampling of an input signal spectrum passed through a bandpass filter that is tunable over a wide frequency range of interest and that is sampled based on the bandwidth of the filter rather than the bandwidth of the total frequency range of interest. The bandwidth of the filter may further be variable to provide for optimized search against a variety of signal bandwidths. The reconfigurable direct RF bandpass sampling receiver may be implemented with a single fixed clock for applications where the signals of interest lie in adjacent non-overlapping frequency channels. For applications requiring arbitrary tuning, the reconfigurable direct RF bandpass sampling receiver can also use a programmable or switched sampling clock to avoid the Nyquist sample boundaries that occur with bandpass sampling and thus provide sampling of arbitrary frequencies. A high-speed analog pre-sampler may be included to extend the maximum frequency range that can be sampled.