Robert C Elder

US Patent:

60091304, Dec 28, 1999

Filed:

Aug 18, 1997

Appl. No.:

8/817896

Inventors:

Daniel M. Lurey - Hoffman Estates IL
Alan P. Rottinghaus - Barrington IL
Sheila M. Rader - Wildwood IL
Yuda Y. Luz - Euless TX
Paul F. Smith - North Richland Hills TX
John M. Smith - Elgin IL
Danny T. Pinckley - Arlington TX
Kevin M. Laird - Haltom City TX
Anthony Kobrinetz - Hoffman Estates IL
Robert C. Elder - McHenry IL
Donald E. Bailey - Palatine IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04L 102
H04B 110
H04B 1702

US Classification:

375347

Abstract:

A digital receiver (200) and transmitter (300), wherein the digital receiver includes a plurality of antennas (202) for receiving uplink radio frequency signals; a plurality of analog to digital converters (210) for converting the received radio frequency signals into digital signals; a switched digital down converter (214) for down converting one of the digital signals to a baseband IF signal; and a channel processor (228) for recovering one of a plurality of communication channels contained within the baseband IF signal.

US Patent:

58126058, Sep 22, 1998

Filed:

Apr 15, 1997

Appl. No.:

8/835785

Inventors:

Paul Fielding Smith - North Richland Hills TX
John M. Smith - Elgin IL
Alan P. Rottinghaus - Barrington IL
Shelia Marie Rader - Wildwood IL
Danny Thomas Pinckley - Arlington TX
Yuda Yehuda Luz - Prairie View IL
Daniel Morris Lurey - Hoffman Estates IL
Kevin Michael Laird - Haltom City TX
Tony Kobrinetz - Hoffman Estates IL
Robert C. Elder - McHenry IL
Donald E. Bailey - Palatine IL

Assignee:

Motorola, inc. - Schaumburg IL

International Classification:

H04L 2720

US Classification:

375308

Abstract:

A multi-channel digital transceiver (400) receives uplink radio frequency signals and converts these signals to digital intermediate frequency signals. Digital signal processing, including a digital converter module (426), is employed to select digital intermediate frequency signals received at a plurality of antennas (412) and to convert these signals to baseband signals. The baseband signals are processed to recover a communication channel therefrom. Downlink baseband signals are also processed and digital signal processing within the digital converter module (426) up converters and modulates the downlink baseband signals to digital intermediate frequency signals. The digital intermediate frequency signals are converted to analog radio frequency signals, amplified and radiated from transmit antennas (420).

US Patent:

57967776, Aug 18, 1998

Filed:

Feb 27, 1996

Appl. No.:

8/607752

Inventors:

Daniel Joseph Terlep - Crystal Lake IL
Robert Charles Elder - McHenry IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 346
H04B 1700

US Classification:

375227

Abstract:

A method including the steps of digitizing a first radio frequency signal at a first clock rate to produce a first digitized signal, digitizing a second radio frequency signal at a second clock rate to produce a second digitized signal, performing a first signal quality measurement indicative of the signal quality of the first digitized signal, performing a second signal quality measurement indicative of the signal quality of the second digitized signal, and selecting one of the first and second digitized signals based on the first and second signal quality measurements.

US Patent:

56595468, Aug 19, 1997

Filed:

Mar 21, 1996

Appl. No.:

8/619193

Inventors:

Robert C. Elder - McHenry IL

International Classification:

H04J 105

US Classification:

370343

Abstract:

A wideband frequency signal digitizer and method for digitizing multiple bands of a wideband frequency signal. The digitizer and method providing for optimally positioning a segment (402) of the wideband frequency signal within a Nyquist band of an analog-to-digital converter. Remaining segments (402) of the wideband frequency signal are closely positioned relative to the first segment such that the entire wideband frequency signal (400) is easily digitized using a single or multiple analog-to-digital converters (36) while reducing or eliminating undesirable spurious signals.

US Patent:

56403852, Jun 17, 1997

Filed:

Jan 4, 1994

Appl. No.:

8/177363

Inventors:

James F. Long - Glen Ellyn IL
Robert C. Elder - McHenry IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04J 1300

US Classification:

370335

Abstract:

A wireless communication system for simultaneously communicating overlapping wideband and narrowband signals. The system includes a transmitting station for embedding one or more narrowband signals (3-5) in a wideband signal (1) having a frequency spectrum encompassing the narrowband signals, and transmitting the resulting composite wideband signal (2). The system also includes a receiving station for receiving a composite wideband signal (60) and separating the embedded narrowband signal(s) (62, 63) from the wideband signal (61). In one embodiment, a cellular radiotelephone base station (35) is operable as both the transmitting and receiving station, communicating with remote subscriber units (29-31) having conventional transceivers (FDMA, TDMA and/or CDMA). The base station transmitter circuitry (10-17) includes FM and CDMA signal generators (10, 12), a combiner (15) for embedding the narrowband signal (3-5) in the wideband signal (1), and an AGC (14) and power detectors (11, 13) for controlling the narrowband signal power. The receiving circuitry includes a CDMA processing circuit having an FFT circuit (41), a threshold detector (42), a notch filter (43), and an inverse FFT circuit (44) for separating narrowband signals (62, 63) from the CDMA signal (61).

US Patent:

58188835, Oct 6, 1998

Filed:

Jul 23, 1996

Appl. No.:

8/685123

Inventors:

Paul Fielding Smith - North Richland Hills TX
John M. Smith - Elgin IL
Alan P. Rottinghaus - Barrington IL
Shelia Marie Rader - Wildwood IL
Danny Thomas Pinckley - Arlington TX
Yuda Yehuda Luz - Prairie View IL
Daniel Morris Lurey - Hoffman Estates IL
Kevin Michael Laird - Haltom City TX
Tony Kobrinetz - Hoffman Estates IL
Robert C. Elder - McHenry IL
Donald E. Bailey - Palatine IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 708

US Classification:

375347

Abstract:

A multi-channel digital transceiver (400) receives uplink radio frequency signals and converts these signals to digital intermediate frequency signals. Digital signal processing, including a digital converter module (426), is employed to select digital intermediate frequency signals received at a plurality of antennas (412) and to convert these signals to baseband signals. The baseband signals are processed to recover a communication channel therefrom. Downlink baseband signals are also processed and digital signal processing within the digital converter module (426) up converters and modulates the downlink baseband signals to digital intermediate frequency signals. The digital intermediate frequency signals are converted to analog radio frequency signals, amplified and radiated from transmit antennas (420).

US Patent:

55793410, Nov 26, 1996

Filed:

Dec 29, 1994

Appl. No.:

8/366283

Inventors:

Paul F. Smith - North Richland Hills TX
John M. Smith - Elgin IL
Alan P. Rottinghaus - Barrington IL
Shelia M. Rader - Wildwood IL
Danny T. Pinckley - Arlington TX
Yuda Y. Luz - Prairie View IL
Daniel M. Lurey - Hoffman Estates IL
Kevin M. Laird - Haltom City TX
Tony Kobrinetz - Hoffman Estates IL
Robert C. Elder - McHenry IL
Donald E. Bailey - Palatine IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 702

US Classification:

375267

Abstract:

A multi-channel digital transceiver (400) receives uplink radio frequency signals and converts these signals to digital intermediate frequency signals. Digital signal processing, including a digital converter module (426), is employed to select digital intermediate frequency signals received at a plurality of antennas (412) and to convert these signals to baseband signals. The baseband signals are processed to recover a communication channel therefrom. Downlink baseband signals are also processed and digital signal processing within the digital converter module (426) up converters and modulates the downlink baseband signals to digital intermediate frequency signals. The digital intermediate frequency signals are converted to analog radio frequency signals, amplified and radiated from transmit antennas (420).