Johnny M Harris

US Patent:

7054286, May 30, 2006

Filed:

Apr 9, 2001

Appl. No.:

09/829092

Inventors:

Richard B. Ertel - Midvale UT, US
Eric K. Hall - Holliday UT, US
Thomas R. Giallorenzi - Riverton UT, US
Philip L. Stephenson - Salt Lake City UT, US
Johnny M. Harris - Centerville UT, US
Edward P. Newren - Woods Cross UT, US

Assignee:

L-3 Communications Corporation - New York NY

International Classification:

H04Q 7/00

US Classification:

370329, 370335

Abstract:

This invention provides a highly flexible multiplexing scheme for Direct Sequence CDMA systems enabling the CDMA system to flexibly allocate CDMA channel resources between packet-switched broadcast channels and fast-circuit-switched dedicated channels in order to optimize system throughput. A method and system are provided for operating a communication system. The method has steps of: flexibly allocating CDMA channel resources between packet-switched broadcast channels and fast-circuit-switched dedicated channels in order to optimize system throughput, and employing a side channel as required to send all or a part of a total amount of data, depending on the total amount of the data. A bandwidth allocation scheme allocates a set of CDMA channels for burst packet-switched channels, and data is time division multiplexed over the set of burst CDMA channels providing a wide bandwidth data pipe for packet-switched data. Subscriber stations are equipped with multiple CDMA channel receivers tuned to the burst CDMA channels.

US Patent:

7369606, May 6, 2008

Filed:

Feb 19, 2004

Appl. No.:

10/783048

Inventors:

Richard B. Ertel - Midvale UT, US
Dan M. Griffin - Bountiful UT, US
Johnny M. Harris - Centerville UT, US
Eric K. Hall - Holliday UT, US
Thomas R. Giallorenzi - Riverton UT, US

Assignee:

L-3 Communications Corporation - New York NY

International Classification:

H04B 3/46

US Classification:

375226

Abstract:

A method is presented for estimating a phase error for first (r) and second (r) orthogonal signal components spread respectively by different first cand second cspreading codes. A cross-despread value IdQ and/or QdI is determined by despreading one signal component with the spreading codes associated with the other signal component (rwith cor rwith c). In parallel, the same signal component is also despread with its associated spreading code to determine an estimated data symbol for that component. An interference of Q into I or I into Q is calculated and multiplied by the estimated data symbol, and subtracted from the cross-despread value to achieve an estimate of phase error. Preferably, both cross-despread values are obtained, normalized to a common data rate, scaled to maximize signal to noise ratio, and combined into one phase error estimate. A phase error detector includes despreaders, multipliers, and adders to determine the cross-despread value and subtract the interference from it.

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:

7596113, Sep 29, 2009

Filed:

Sep 28, 2006

Appl. No.:

11/540138

Inventors:

Samuel C. Kingston - Salt Lake City UT, US
Thomas R. Giallorenzi - Herriman UT, US
Johnny M. Harris - Centerville UT, US

Assignee:

L-3 Communications, Corp. - New York NY

International Classification:

H04B 7/216

US Classification:

370320, 370350, 370519

Abstract:

A technique for scheduling transmissions for a plurality of transmitters in a TDMA network is described. The technique includes assigning guard time between each pair of successive transmitters, where the guard time is related to the propagation delay between the pair of successive transmitters. Total guard time is minimized by selecting an order of transmission for the plurality of transmitters to minimize the total guard time.

US Patent:

7602834, Oct 13, 2009

Filed:

Sep 28, 2006

Appl. No.:

11/540139

Inventors:

Thomas R. Giallorenzi - Herriman UT, US
Johnny M. Harris - Centerville UT, US
Dan M. Griffin - Bountiful UT, US
Sam Kingston - Salt Lake City UT, US

Assignee:

L-3 Communications, Corp. - New York NY

International Classification:

H04B 1/00

US Classification:

375130, 375136, 375142, 375143, 375147, 375150, 375152

Abstract:

A system and method for determining a fine frequency offset of a composite code spread spectrum signal is disclosed. The method includes despreading at least one component of the composite spread spectrum signal to form a partially despread composite spread spectrum signal. A set of on-time samples are selected from the signal. The set of on-time samples are rotated by a predetermined frequency amount. The set of rotated samples are placed into a plurality of frequency bins, with each frequency bin representative of a different frequency estimate. An energy for the signal in each frequency bin is determined to find the bin having the greatest energy.

US Patent:

7602835, Oct 13, 2009

Filed:

Aug 10, 2004

Appl. No.:

10/915777

Inventors:

Samuel C. Kingston - Salt Lake City UT, US
Johnny M. Harris - Centerville UT, US
Thomas R. Giallorenzi - Riverton UT, US
Dan M. Griffin - Bountiful UT, US
David W. Thorson - Salt Lake City UT, US

Assignee:

L-3 Communications Corporation - New York NY

International Classification:

H04B 1/00

US Classification:

375142, 375134, 375135, 375136, 375137, 375140, 375143, 375145, 375146, 375147, 375149, 375150, 375152, 375253, 375306, 375307, 375316, 375326, 375350, 375367

Abstract:

A correlator despreads a P/N long code constructed from two or more constituent codes A, B, C having N, M and L elements respectively. In a third stage, L filter taps decorrelate elements of the third constituent code from the input received signal, leaving elements of code AB. The outputs of the third stage delay line are summed and input into a second stage delay line having M filter taps to decorrelate the elements of the second constituent code from the input to the second stage, leaving elements of code A. The outputs of the second stage delay line are summed and input to a first stage delay line having N filter taps. The output of the first stage delay line is summed and input into a shift register. An energy peak in the shift register indicates the phase of the P/N elements in the register is proper.

US Patent:

7609751, Oct 27, 2009

Filed:

May 24, 2005

Appl. No.:

11/136783

Inventors:

Thomas R. Giallorenzi - Riverton UT, US
Johnny M. Harris - Centerville UT, US
Eric K. Hall - Holliday UT, US
Richard B. Ertel - Midvale UT, US
Dan M. Griffin - Bountiful UT, US

Assignee:

L-3 Communications Corporation - New York NY

International Classification:

H04B 1/00

US Classification:

375142, 375140, 375141, 375143, 375145, 375146, 375295, 375354, 375357, 375359, 375367

Abstract:

A first node initiating communications with a second node already in a secure network sends a discovery burst having a preamble portion and a payload portion. The preamble portion is sent at a varying frequency between high and low thresholds that are reflective of Doppler uncertainty between the nodes. The second node continuously listens at a frequency, termed an acquisition frequency. A data sequence in the preamble portion, known to the second node, is received and used to determine the receive instant in the preamble portion, and thereby compare against the known frequency ramp to determine the frequency at which the payload portion will be received. Preferably, the first node varies the preamble portion between thresholds more than once within the time span of a single preamble portion, and the preamble and payload portions are spread with different spreading codes. The preamble portion may also be disguised with noise generated by the first node.

US Patent:

7633995, Dec 15, 2009

Filed:

Feb 10, 2006

Appl. No.:

11/351608

Inventors:

Thomas R. Giallorenzi - Herriman UT, US
Johnny M. Harris - Centerville UT, US
Dan M. Griffin - Bountiful UT, US
Richard Ertel - Sandy UT, US
Eric K. Hall - Sandy UT, US

Assignee:

L-3 Communications, Corp. - New York NY

International Classification:

H04B 1/00

US Classification:

375148, 375141, 375140, 375130, 375343, 375340, 375316

Abstract:

A technique for receiving multiple spread spectrum bursts is disclosed. Each spread spectrum burst is encoded with a common spreading code and may include an individual message and unique signal parameters. The technique includes the detection of the spread spectrum encoded bursts and estimation of the reception signal parameters. A single one of a plurality of burst receivers is assigned to each detected burst to extract the individual message of the detected burst.