Michael D Rice

US Patent:

7302016, Nov 27, 2007

Filed:

Aug 13, 2003

Appl. No.:

10/640065

Inventors:

Michael Rice - Provo UT, US
William K. McIntire - Sandy UT, US

Assignee:

L-3 Communicaations Corporation - New York NY

International Classification:

H03D 3/22

US Classification:

375329, 375326, 4555531

Abstract:

A method and serial detector for demodulating a phase-modulated signal are presented. In particular, a carrier phase estimator applies a phase estimate to an output of a matched serial filter. The filter output is matched to the first Laurent pulse of the received signal, and the phase estimate corrects for a phase bias introduced by using the first Laurent pulse. The method and detector are particularly valuable in Gaussian Minimum Shift Keying (GMSK) modulated systems and where then product of the bandwidth B and the bit rate Tis less than about 0. 3, and where a training sequence in a header of a burst system has a length Lless than about 5000. Three estimates of phase offset are given, each taking the inner product of x and the conjugate transpose of either a or p; wherein x is a vector of data samples, a is a vector of pseudo symbols, and p is a vector of the data and ISI portions of the samples.

US Patent:

7529524, May 5, 2009

Filed:

Oct 26, 2005

Appl. No.:

11/259850

Inventors:

Thomas R. Giallorenzi - Riverton UT, US
Michael Rice - Provo UT, US
William K. McIntire - Sandy UT, US
June Sun - Salt Lake City UT, US

Assignee:

L3 Communications Corporation - New York NY

International Classification:

H04B 1/04

US Classification:

455126, 4551143, 4551942, 455311, 375295, 375296, 375297

Abstract:

In an aspect of the invention, a method is performed in a transceiver for adaptive power amplifier linearization in time division duplex communication systems. The method comprises, in response to a first condition, performing, using a feedback signal generated by receiving subsystem circuitry, adaptive power amplifier linearization on a signal to be transmitted. The method additionally comprises, in response to a second condition, performing operations in order to determine receive data from a received radio frequency (RF) signal. The operations use at least the receiving subsystem circuitry. In a further aspect of the present invention, a transceiver is disclosed.

US Patent:

7558238, Jul 7, 2009

Filed:

Jan 18, 2006

Appl. No.:

11/335439

Inventors:

June Sun - Salt Lake City UT, US
Thomas R. Giallorenzi - Riverton UT, US
Michael Rice - Provo UT, US
Samuel C. Kingston - Salt Lake City UT, US
Johnny M. Harris - Centerville UT, US

Assignee:

L-3 Communications Corporation - New York NY

International Classification:

H04B 7/216

US Classification:

370335, 370337, 370342, 370442, 370210, 4555521

Abstract:

A method for partitioning communication resource among multiple users partitions a portion of an available communication resource into a series of time-frequency slots, and allows multiple users to transmit in one of at least two available modes within a time-frequency slot. Preferably, one mode is time division of the time-frequency slot into time sub-slots, and another mode is code division of the time-frequency slot according to different spreading codes that spread an individual user's signal only within the subject time-frequency slot. Further details as to pilot signals, guard intervals, and payloads are described.

US Patent:

7701999, Apr 20, 2010

Filed:

May 2, 2006

Appl. No.:

11/416656

Inventors:

Christian Schlegel - Park City UT, US
Samuel C. Kingston - Salt Lake City UT, US
Thomas R. Giallorenzi - Riverton UT, US
Michael Rice - Provo UT, US
June Sun - Salt Lake City UT, US

Assignee:

L3 Corrections Corporation - New York NY

International Classification:

H04B 1/00

US Classification:

375144, 375148, 375346, 455501, 455 631, 455296

Abstract:

Disclosed is a method for acquiring a user signal from among several received from multiple users in a single burst. The method includes receiving a plurality of user signals in a single transmission burst, suppressing multiuser interference among at least some of the plurality of received signals, and determining a carrier frequency of at least one signal from among the interference suppressed plurality of received signals. Said signals may rotate due to a lack of synchronization while being equalized. Also described is a multiuser receiver for acquiring at least one user signal from among several user signals received from multiple users in a single burst. An antenna is for receiving a plurality of user signals in a single spread spectrum transmission burst, a matched filter is for despreading the signals, a multiuser equalizer is for suppressing mutual interference among at least a portion of the plurality of user signals, and a carrier lock circuit is for determining a carrier frequency of at least one user signal of the portion.

US Patent:

7768990, Aug 3, 2010

Filed:

Feb 9, 2006

Appl. No.:

11/351363

Inventors:

Christian Schlegel - Park City UT, US
Samuel C. Kingston - Salt Lake City UT, US
Thomas R. Giallorenzi - Riverton UT, US
Michael Rice - Provo UT, US
June Sun - Salt Lake City UT, US

Assignee:

L3 Communications Corporation - New York NY

International Classification:

H04J 3/00

US Classification:

370345, 370347, 375147, 375148

Abstract:

A method for acquiring signals received from multiple users in a single burst groups signals by power and sequentially processes the signal groups. A received sum of a plurality of user signals received in a burst is stored, and the transmitted symbols for each signal within a first group of the stored signals is estimated. A modified set of signals is then determined that excludes the signals of the first group. From the modified set of signals, the method continues by canceling multiuser interference among signals within a second group, and estimating transmitted symbols for each signal within the second group. The first and second groups includes all signals within a power band that defines the group, and the first band represents a higher power band than the second. Such iterative processing may continue for sequentially lower power bands until all signals are processed. A receiver is also detailed.

US Patent:

20060093049, May 4, 2006

Filed:

Oct 18, 2005

Appl. No.:

11/252443

Inventors:

Michael Jensen - Springville UT, US
Michael Rice - Provo UT, US
Norman Nelson - Spanish Fork UT, US
Adam Anderson - La Jolla CA, US

International Classification:

H04L 27/00

US Classification:

375259000

Abstract:

A dual antenna transmitter includes a diversity encoding module that receives a data stream and provides a pair of encoded data streams selected to cause generation of overlapping symbols that provide substantially constant signal power to a receiver when the first and second antennas are unobstructed from the receiver. The diversity encoding module may compensate for the state retention of standard modulators thereby enabling the implementation of the Alamouti transmit diversity scheme. A wireless receiver capable of receiving data transmitted from the aforementioned transmitter includes a metric extraction module that repetitively extracts a metric from a transmitted signal at a selected rate to provide a first and a second metric stream, the first metric stream comprising data that is time offset from data in the second metric stream, the time offset corresponding to a differential time delay to the receiver for symbols emitted from the transmitter antennas.