Robert L Mccarty

US Patent:

6697439, Feb 24, 2004

Filed:

Mar 23, 2000

Appl. No.:

09/534251

Inventors:

Akshaya Trivedi - Richardson TX
Robert Joseph McCarty - Rockwall TX

Assignee:

CynTrust Communications, Inc. - Dallas TX

International Classification:

H04L 2722

US Classification:

375326, 375344

Abstract:

Carrier wave frequency is quickly acquired without burdensome MIPs requirements by limiting the spectral analysis of the incoming channel to the expected band edges. The right and left band edges spectral energy is compared and clock frequency correction is made from the results of this comparison. A band pass filter, such as a Goertzel algorithm filter, is employed to quickly and with processing efficiency perform the spectral analysis at the band edges. Once the direction of the frequency error is derived, the correct frequency can be acquired through a feedback loop employing various iterative correction techniques, such as a gearshift approach in which certain predefined frequency corrections are imposed in decreasing steps until the desired carrier frequency has been acquired.

US Patent:

RE42538, Jul 12, 2011

Filed:

Aug 1, 2007

Appl. No.:

11/882449

Inventors:

Chiaming Lo - Plano TX, US
Robert Joseph McCarty - Plano TX, US

Assignee:

Soar S.K., Limited Liability Company - Wilmington DE

International Classification:

H04L 7/00
H04L 7/06

US Classification:

375354, 375364

Abstract:

A system and method for information content-independent synchronization with a received signal. A variable of the signal (e. g. , average energy or magnitude) which is related to the energy distribution, is measured over a period of time. The signal's information bearing point is found at the point within the information period of the signal with the highest averaged energy. The point may be found, for example, by detecting the sample point with highest average energy, or by correlating multiple sample points to a stored template. Interpolation may be performed to locate an information bearing point that is between sample points. Because the relative energy content of the signal is effectively independent of the specific information content, synchronization with the information bearing point is accomplished without requiring the insertion of any special information content or fixed content patterns into the signal.

US Patent:

20010031015, Oct 18, 2001

Filed:

May 24, 2001

Appl. No.:

09/865912

Inventors:

Randall West - Bedford TX, US
Alvin Kluesing - Southlake TX, US
Robert McCarty - Rockwall TX, US

International Classification:

H04K001/10
H04L027/28

US Classification:

375/260000

Abstract:

Efficient usage of available spectrum is increased by logically dividing government licensed frequency channels into sub-channels, each of which can individually transmit a signal between a base unit and terminal. The sub-channels are each offset from the center of the frequency channel by a unique offset amount to avoid interference. Power control, sub-channel interference cancellation, and frequency control are employed to minimize the effects of out-of-band sub-channel signals on adjacent sub-channels. Any given sub-channel can be dynamically configured to transmit voice or data signals. Further spectral efficiency is realized using time division multiplexing on some or all of the sub-channels.

US Patent:

20020136288, Sep 26, 2002

Filed:

Jan 31, 2001

Appl. No.:

09/774832

Inventors:

Robert McCarty - Plano TX, US

Assignee:

ComSpace Corporation

International Classification:

H03K005/159
H03H007/30
H03H007/40
H04B001/66

US Classification:

375/232000, 375/240000, 375/350000

Abstract:

A system and method for improving the performance of digital filters is disclosed. The data bandwidth and spectral control are improved by adaptively selecting ramp-up and ramp-down symbols based on the actual filtered data. Thus, the energy in the truncated tail of the filter is minimized for a given filter design. The invention is of particular utility in systems that filters intermittent data streams, thus requiring the filter to energize and deenergize repeatedly.

US Patent:

20020159553, Oct 31, 2002

Filed:

Apr 17, 2001

Appl. No.:

09/835709

Inventors:

Robert McCarty - Plano TX, US
William Priest - Plano TX, US

Assignee:

ComSpace Corporation

International Classification:

H04L007/04

US Classification:

375/362000, 370/509000

Abstract:

A method of apparatus for achieving and maintaining alignment of a data receiver to data frames in the presence of noise is taught. A statistical weighting process is employed to sample synchronization symbols that reoccur in data frames. The information is used to maintain alignment to the data frames by tolerating a greater number of data errors. A plurality of synchronization symbols are decoded with a weighted probability of error in decoding determined for each. The weighted probabilities are combined and the resultant value is compared to a threshold value. If the threshold is met, then alignment is achieved or maintained based upon the statistical process. Improved performance in lower SNR environments is achieved.

US Patent:

20030016622, Jan 23, 2003

Filed:

Jul 13, 2001

Appl. No.:

09/904933

Inventors:

Robert McCarty - Plano TX, US

Assignee:

ComSpace Corporation

International Classification:

H04J011/00

US Classification:

370/207000, 370/480000

Abstract:

A method and apparatus that differentially encodes and decodes data symbols in dual domains is taught. Data packets are encoded, transmitted, and decoded during a plurality of symbol intervals on a plurality of sub-carriers. Encoding and decoding are accomplished across both the time and frequency domains such that the minimum number of carrier states are employed as reference only states that do not encode a symbol of data in and of themselves. A rule of adjacency is followed, both across time and frequency, so that decorrelation is minimized. Any modulation scheme that is applicable to differential encoding and decoding can be utilized. Communication systems that couple via radio waves, through metallic conductors, or over fiber optic paths can be employed.

US Patent:

62529102, Jun 26, 2001

Filed:

Apr 21, 1999

Appl. No.:

9/295660

Inventors:

Randall J. West - Bedford TX
Alvin Dale Kluesing - Southlake TX
Robert Joseph McCarty - Rockwall TX

Assignee:

ComSpace Corporation - Coppell TX

International Classification:

H04L 512
H04L 2302

US Classification:

375261

Abstract:

Efficient usage of available spectrum is increased by logically dividing government licensed frequency channels into sub-channels, each of which can individually transmit a signal between a base unit and terminal. The sub-channels are each offset from the center of the frequency channel by a unique offset amount to avoid interference. Power control, sub-channel interference cancellation, and frequency control are employed to minimize the effects of out-of-band sub-channel signals on adjacent sub-channels. Any given sub-channel can be dynamically configured to transmit voice or data signals. Further spectral efficiency is realized using time division multiplexing on some or all of the sub-channels.