Timothy F Dyson

US Patent:

7770087, Aug 3, 2010

Filed:

Jan 19, 2007

Appl. No.:

11/624904

Inventors:

Maria Laprade - Palm Bay FL, US
Matthew C. Cobb - West Melbourne FL, US
Timothy F. Dyson - Melbourne FL, US

Assignee:

Harris Corporation - Melbourne FL

International Classification:

H03M 13/00

US Classification:

714755, 714758

Abstract:

A serial concatenated convolutional code (SCCC) decoder is provided. The SCCC decoder is comprised of an input buffer memory (), one or more processing loop modules (), and an output buffer memory (). Each processing loop module is comprised of a permutation module (), an inner decoder module (), a depermutation module (), and an outer decoder module (). The inner decoder module is subdivided into two (2) or more inner decoding engines (-) configured for concurrently performing a decoding operation based on an inner convolutional code. The outer decoder module is subdivided into two (2) or more outer decoding engines (-) configured for concurrently performing a decoding operation based on an outer convolutional code. The inner convolutional code and the outer convolutional code are designed in accordance with a maximum aposteriori probability based decoding algorithm.

US Patent:

7870458, Jan 11, 2011

Filed:

Mar 14, 2007

Appl. No.:

11/685849

Inventors:

Maria Laprade - Palm Bay FL, US
Matthew C. Cobb - W. Melbourne FL, US
Timothy F. Dyson - Melbourne FL, US

Assignee:

Harris Corporation - Melbourne FL

International Classification:

H03M 13/00

US Classification:

714752, 714758, 714755

Abstract:

A decoding system () is provided. The decoding system is comprised of two or more serial concatenated convolutional code (SCCC) decoders (-) operating in parallel. The SCCC decoders are configured to concurrently decode codeblocks which have been encoded using a convolutational code. The decoding system is also comprised of a single common address generator () and data store (). The address generator is responsive to requests for data needed by two or more of the SCCC decoders for permutation and depermutation. The data store is comprised of two or more memory blocks (-). The SCCC decoders concurrently generate requests for two or more different data types. Selected ones of the different data types are exclusively stored in different ones of the memory blocks. Selected ones of the different data types are comprised of data which is requested at the same time by a particular one of the SCCC decoders.

US Patent:

7904784, Mar 8, 2011

Filed:

Mar 14, 2007

Appl. No.:

11/685919

Inventors:

Maria Laprade - Palm Bay FL, US
Matthew C. Cobb - W. Melbourne FL, US
Timothy F. Dyson - Melbourne FL, US

Assignee:

Harris Corporation - Melbourne FL

International Classification:

H03M 13/00

US Classification:

714755, 714784, 714786

Abstract:

A serial concatenated convolutional code (SCCC) decoder is provided. The SCCC decoder includes an input buffer memory one or more processing loop modules, and an output buffer memory. Each processing loop module includes a permutation module, inner decoding engines, a depermutation module, and outer decoding engines. The depermutation module includes a concatenating device and two or more depermutation buffer memories. The concatenating device is configured for writing a codeword segment containing a plurality of soft-decision bits to each of the depermutation buffer memories in a single write operation. The permutation module also includes a concatenating device and two or more permutation buffer memories. The concatenating device is configured for writing a codeword segment containing a plurality of soft-decision bits to each of the depermutation buffer memories in a single write operation.

US Patent:

7948864, May 24, 2011

Filed:

Jul 17, 2009

Appl. No.:

12/504696

Inventors:

Timothy F. Dyson - Melbourne FL, US

Assignee:

Harris Corporation - Melbourne FL

International Classification:

H04J 11/00

US Classification:

370204, 370208

Abstract:

A communications system () includes a segmenter () for dividing a plurality of bits into a first segment and a second segment and a symbol mapper () for generating a plurality of symbols based on the first segment. The system also includes a co-set selector () for selecting a plurality of co-set waveforms from a plurality of orthogonal waveforms based on a co-set address defined by the second segment, a number (K) of the plurality of co-set waveforms being less than a number (N) of the plurality of orthogonal waveforms. The system further includes a modulator () for modulating the plurality of symbols based on the plurality of co-set waveforms.

US Patent:

7991082, Aug 2, 2011

Filed:

Oct 31, 2007

Appl. No.:

11/931156

Inventors:

Maria Laprade - Palm Bay FL, US
Matthew C. Cobb - W. Melbourne FL, US
Timothy F. Dyson - Melbourne FL, US

Assignee:

Harris Corporation - Melbourne FL

International Classification:

H03M 13/03

US Classification:

375341, 375262, 714794, 714796

Abstract:

A method is provided for performing a MAP probability decoding of a sequence R(n) including N bits of encoded data. The method includes the steps of: (a) generating a sequence rof sot-values by processing the sequence R(n); (b) performing a forward recursion by computing alpha values αutilizing the soft-decision values; (c) performing a backward recursion by computing beta values βutilizing the soft-decision values; and (d) performing an extrinsic computation by computing probability values p′. The alpha values αare relative log-likelihoods of an encoding process arriving at various states. The beta values βare relative log-likelihoods of the encoding process arriving at various states. The probability values p′represent a set of probabilities indicating that each data bit of an input sequence dhad a value equal to zero or one. The sequence R(n) represents an encoded form of the input sequence d.

US Patent:

8024636, Sep 20, 2011

Filed:

May 4, 2007

Appl. No.:

11/744440

Inventors:

Maria Laprade - Palm Bay FL, US
Matthew C. Cobb - W. Melbourne FL, US
Timothy F. Dyson - Melbourne FL, US

Assignee:

Harris Corporation - Melbourne FL

International Classification:

H03M 13/00
H03M 13/03

US Classification:

714755, 714786

Abstract:

A Serially Concatenated Convolutional Code (SCCC) decoding system includes an outer decoder module (), permutation module (), and data store (). The outer decoder module is configured to generate a first sequence of soft-decision bits x[n] for n=0, 1, 2,. . . , N−1. The permutation module is configured to permute the first sequence of soft-decision bits x[n] to generate a second sequence of soft-decision bits y[n]. The first sequence of soft-decision bits x[n] is generated by the outer decoder module in accordance with a mapping v[n]. The second sequence of soft-decision bits y[n] is generated for communication to an inner decoder module (). The data store contains a mapping v[n]. The mapping v[n] satisfies a mathematical equation v[k+m(N/M)] modulo (N/M)=v[k] modulo (N/M) for m=0,. . . , M−1 and k=0,. . . , (N/M−1).

US Patent:

63078902, Oct 23, 2001

Filed:

Dec 6, 1999

Appl. No.:

9/455982

Inventors:

Timothy F. Dyson - San Clemente CA
Steven J. Davis - Hermosa Beach CA
Gordon E. Kaiser - San Juan Capistrano CA

Assignee:

Cue Corporation - Irvine CA

International Classification:

H04L 2302
H04L 512

US Classification:

375265

Abstract:

The present invention provides a system for multiplexing DARC encoded source channels using an FM subcarrier, wherein the system includes a plurality of channels. Each channel within the plurality of channels is coupled to its own DARC encoded source channel. Within each channel of the system, the DARC encoded source channel is block encoded to produce parity and data bytes. The parity bytes and data bytes are separately trellis code modulated to form a first and second set of complex signals, respectively. A first digital modulator modulates a first set of orthogonal signals using the first set of complex signals. A second digital modulates a second set of orthogonal signals using the second set of complex signals.

US Patent:

20170102466, Apr 13, 2017

Filed:

Oct 9, 2015

Appl. No.:

14/879135

Inventors:

- Melbourne FL, US
Timothy F. Dyson - Melbourne FL, US
Jason Plew - Malabar FL, US
Joshua P. Bruckmeyer - West Melbourne FL, US
Charles Zahm - Indialantic FL, US

International Classification:

G01S 19/46

Abstract:

Systems () and methods () for space-based geolocation. The methods involve receiving by at least two first satellites a maritime signal transmitted from a vessel on or near Earth. The first satellites are deployed in space so as to have overlapping coverage areas. The maritime signal (received at the at least two first satellites) is then used to determine a geographic location of the vessel on Earth using at least one of a Time Difference of Arrival (“TDOA”) and a Frequency Difference of Arrival (“FDOA”).