James W Bishop

US Patent:

8068556, Nov 29, 2011

Filed:

Jun 26, 2008

Appl. No.:

12/147100

Inventors:

James W. Bishop - Ellicott City MD, US
Nazrul H. Mohd Zaki - Columbia MD, US
David Childress Newman - Salisbury MD, US
Steven N. Bundick - Pocomoke City MD, US

Assignee:

LJT & Associates, Inc. - Columbia MD

International Classification:

H04L 27/00

US Classification:

375295, 375219, 375135, 375146, 375297, 4551271, 455126

Abstract:

A flexible, reconfigurable, power efficient transmitter device and method is provided. In one embodiment, the method includes receiving outbound data and determining a mode of operation. When operating in a first mode the method may include modulation mapping the outbound data according a modulation scheme to provide first modulation mapped digital data, converting the first modulation mapped digital data to an analog signal that comprises an intermediate frequency (IF) analog signal, upconverting the IF analog signal to produce a first modulated radio frequency (RF) signal based on a local oscillator signal, amplifying the first RF modulated signal to produce a first RF output signal, and outputting the first RF output signal via an isolator. In a second mode of operation method may include modulation mapping the outbound data according a modulation scheme to provide second modulation mapped digital data, converting the second modulation mapped digital data to a first digital baseband signal, conditioning the first digital baseband signal to provide a first analog baseband signal, modulating one or more carriers with the first analog baseband signal to produce a second modulated RF signal based on a local oscillator signal, amplifying the second RF modulated signal to produce a second RF output signal, and outputting the second RF output signal via the isolator. The digital baseband signal may comprise an in-phase (I) digital baseband signal and a quadrature (Q) baseband signal.

US Patent:

20090323859, Dec 31, 2009

Filed:

Jun 17, 2009

Appl. No.:

12/486388

Inventors:

James W. Bishop - Ellicott City MD, US
Nazrul H. Mohd Zaki - Columbia MD, US
David Childress Newman - Salisbury MD, US
Steven N. Bundick - Pocomoke City MD, US

International Classification:

H04L 27/36
H04L 27/00

US Classification:

375298, 375295

Abstract:

A flexible, reconfigurable, power efficient transmitter device and method is provided. In one embodiment, the method includes receiving outbound data and determining a mode of operation. When operating in a first mode the method may include modulation mapping the outbound data according a modulation scheme to provide first modulation mapped digital data, converting the first modulation mapped digital data to an analog signal that comprises an intermediate frequency (IF) analog signal, upconverting the IF analog signal to produce a first modulated radio frequency (RF) signal based on a local oscillator signal, upconverting the first RF modulated signal to produce a first RF output signal, and outputting the first RF output signal via an isolator. In a second mode of operation method may include modulation mapping the outbound data according a modulation scheme to provide second modulation mapped digital data, converting the second modulation mapped digital data to a first digital baseband signal, conditioning the first digital baseband signal to provide a first analog baseband signal, modulating one or more carriers with the first analog baseband signal to produce a second modulated RF signal based on a local oscillator signal, upconverting the second RF modulated signal to produce a second RF output signal, and outputting the second RF output signal via the isolator. The digital baseband signal may comprise an in-phase (I) digital baseband signal and a quadrature (Q) baseband signal.