William Lamar Lindsey

US Patent:

6952439, Oct 4, 2005

Filed:

Oct 13, 2000

Appl. No.:

09/687024

Inventors:

William C. Lindsey - Pasadena CA, US
Young M. Kim - L.A. CA, US

Assignee:

The Titan Corporation - San Diego CA

International Classification:

H04B001/707

US Classification:

375140

Abstract:

Data at a transmitter is modulated, in accordance with instructions from a receiver, to provide M different modulations in successive sequences. N spreading codes are also provided in successive sequences at the transmitter, in accordance with instructions from the receiver, alternately with the M data modulations. The alternate sequences of the M data modulations and the N spreading codes are paired and individual ones of the M data modulations and the N spreading codes in the paired sequences are combined (e. g. multiplied). The paired combinations of the individual ones of the M data modulations and the N spreading codes are transmitted to the receiver, which uses correlation or matched filter techniques to recover each combination of the individual one of the data modulations and the individual one of the spreading codes. A single spreading code may be used instead of the N spreading codes.

US Patent:

6990139, Jan 24, 2006

Filed:

Jul 16, 2004

Appl. No.:

10/892871

Inventors:

William C. Lindsey - Pasadena CA, US
Young M. Kim - L.A. CA, US

Assignee:

The Titan Corporation - San Diego CA

International Classification:

H04B 1/707

US Classification:

375146, 375140

Abstract:

Data at a transmitter is modulated, in accordance with instructions from a receiver, to provide M different modulations in successive sequences. N spreading codes are also provided in successive sequences at the transmitter, in accordance with instructions from the receiver, alternately with the M data modulations. The alternate sequences of the M data modulations and the N spreading codes are paired and individual ones of the M data modulations and the N spreading codes in the paired sequences are combined (e. g. multiplied). Alternatively, an individual one of the M data modulations is combined (e. g. multiplied) with an individual one of the N spreading codes in the adjacent sequence. The modulator and the spreader may be included at the transmitter with (a) a channel encoder which provides channel coding in accordance with instructions from the receiver, (b) a puncturer which removes particular data in accordance with instructions from the receiver and (c) an interleaver. The paired combinations of the individual ones of the M data modulations and the N spreading codes are transmitted to the receiver, which uses correlation or matched filter techniques to recover each combination of the individual one of the data modulations and the individual one of the spreading codes. The recovered data is de-spread in accordance with instructions from the receiver, demodulated in accordance with instructions from the receiver and de-interleaved.

US Patent:

7184473, Feb 27, 2007

Filed:

Oct 22, 2003

Appl. No.:

10/691133

Inventors:

Ernest C. Chen - San Pedro CA, US
Tung-Sheng Lin - Claremont CA, US
Weizheng Wang - Rancho Palos Verdes CA, US
William C. Lindsey - Pasadena CA, US

Assignee:

The DirecTV Group, Inc. - El Segundo CA

International Classification:

H03H 7/30

US Classification:

375229

Abstract:

A method and apparatus for equalizing digital data signals is disclosed. The method comprises the steps of demodulating and decoding an input signal having input data to produce a data output, remodulating the data output to produce a training sequence including an idealized input signal, wherein the training sequence is comprised of adjacent symbols in the input data, and generating equalizer parameters from the training sequence. The apparatus comprises a demodulator (for demodulating an input signal to produce a data output), a modulator communicatively coupled to the demodulator (for remodulating the data output to produce a training sequence including an idealized input signal wherein the training sequence is comprised of adjacent symbols in the input data), and a parameter generation module communicatively coupled to the modulator (for generating equalizer parameters from the training sequence).

US Patent:

7184489, Feb 27, 2007

Filed:

Oct 24, 2003

Appl. No.:

10/693140

Inventors:

Weizheng Wang - Rancho Palos Verdes CA, US
Guangcai Zhou - Reseda CA, US
Tung-Sheng Lin - Claremont CA, US
Ernest C. Chen - San Pedro CA, US
Joseph Santoru - Agoura Hills CA, US
William C. Lindsey - Pasadena CA, US

Assignee:

The DirecTV Group, Inc. - El Segundo CA

International Classification:

H04L 27/04

US Classification:

375295

Abstract:

A method and apparatus for optimizing a system for transmitting a layered modulated signal is disclosed. The method comprises the steps of defining the system in terms of a set of system parameters, including an optimal power separation S between a power of a first modulation layer and a power of a second modulation layer and a required system carrier-to-noise ratio (CNR), determining an optimal power separation S to minimize the error rate of a lower layer modulated signal BER, and selecting the remaining system parameters in the set of system parameters using the determined optimal power separation S.

US Patent:

7403574, Jul 22, 2008

Filed:

Aug 27, 2004

Appl. No.:

10/568384

Inventors:

Ernest C. Chen - San Pedro CA, US
Dennis Lai - Cerritos CA, US
Tung-Sheng Lin - Alhambra CA, US
William C. Lindsey - Pasadena CA, US
Shamik Maitra - Redondo Beach CA, US
Joseph Santoru - Agoura Hills CA, US
Guangcai Zhou - Reseda CA, US

Assignee:

The DIRECTV Group, Inc. - El Segundo CA

International Classification:

H03C 3/00

US Classification:

375302, 380268

Abstract:

A simplified scrambling scheme that unifies all signals of a satellite broadcasting system, including frame header (), frame body () and pilot symbols () with a common reference phase. This results in the simplification and increased flexibility of the receiver front-end design without affecting the overall system performance. In many current communications systems with frame headers and pilot symbols, the phases of frame headers and pilot syrnbols are not designed to be aligned with any constellation points of the modulated data from the frame body. This scrambling scheme takes into account possible impact due to irregular phase changes between frame headers/pilot symbols and modulated data.

US Patent:

7469019, Dec 23, 2008

Filed:

Jan 18, 2007

Appl. No.:

11/655001

Inventors:

Weizheng Wang - Rancho Palos Verdes CA, US
Guangcai Zhou - Reseda CA, US
Tung-Sheng Lin - Alhambra CA, US
Ernest C. Chen - San Pedro CA, US
Joseph Santoru - Agoura Hills CA, US
William C. Lindsey - Pasadena CA, US

Assignee:

The DIRECTV Group, Inc. - El Segundo CA

International Classification:

H04L 27/04

US Classification:

375295, 375260

Abstract:

A method and apparatus for optimizing a system for transmitting a layered modulated signal is disclosed. The method comprises the steps of defining the system in terms of a set of system parameters, including an optimal power separation S between a power of a first modulation layer and a power of a second modulation layer and a required system carrier-to-noise ratio (CNR), determining an optimal power separation S to minimize the error rate of a lower layer modulated signal BER, and selecting the remaining system parameters in the set of system parameters using the determined optimal power separation S.

US Patent:

7483505, Jan 27, 2009

Filed:

Oct 22, 2003

Appl. No.:

10/691032

Inventors:

Weizheng W. Wang - Rancho Palos Verdes CA, US
Tung-Sheng Lin - Alhambra CA, US
Ernest C. Chen - San Pedro CA, US
William C. Lindsey - Pasadena CA, US

Assignee:

The DIRECTV Group, Inc. - El Segundo CA

International Classification:

H04B 1/10

US Classification:

375350, 375229, 375231

Abstract:

A method and apparatus for equalizing digital data signals is disclosed. The method comprises the steps of demodulating and decoding an input signal having input data to produce a data output, remodulating the data output to produce a pseudo-training sequence including an idealized input signal, and generating equalizer parameters from the pseudo-training sequence. The apparatus comprises a demodulator for demodulating an input signal to produce a data output, a modulator, communicatively coupled to the demodulator, for remodulating the data output to produce a pseudo-training sequence including an idealized input signal, and a parameter generation module, communicatively coupled to the modulator for generating equalizer parameters from the pseudo-training sequence.

US Patent:

7583728, Sep 1, 2009

Filed:

Jan 22, 2007

Appl. No.:

11/656662

Inventors:

Ernest C. Chen - San Pedro CA, US
Tung-Sheng Lin - Claremont CA, US
Weizheng Wang - Rancho Palos Verdes CA, US
William C. Lindsey - Pasadena CA, US

Assignee:

The DIRECTV Group, Inc. - El Segundo CA

International Classification:

H03H 7/30

US Classification:

375229, 375233

Abstract:

A method and apparatus for equalizing digital data signals is disclosed. The method comprises the steps of demodulating and decoding an input signal having input data to produce a data output, remodulating the data output to produce a training sequence including an idealized input signal, wherein the training sequence is comprised of adjacent symbols in the input data, and generating equalizer parameters from the training sequence. The apparatus comprises a demodulator (for demodulating an input signal to produce a data output), a modulator communicatively coupled to the demodulator (for remodulating the data output to produce a training sequence including an idealized input signal wherein the training sequence is comprised of adjacent symbols in the input data), and a parameter generation module communicatively coupled to the modulator (for generating equalizer parameters from the training sequence).

Address:

22138 Moross Rd, Grosse Pointe, MI 48236

Phone:

(313)8399668

VIN:

5LMFU28507LJ09134

Make:

LINCOLN

Model:

NAVIGATOR

Year:

2007