Edgar H Callaway

7295638, Nov 13, 2007

Nov 17, 2003

10/715222

Frederick L. Martin - Plantation FL, US
Edgar H. Callaway - Boca Raton FL, US
Paul E. Gorday - West Palm Beach FL, US
David B. Taubenheim - Plantation FL, US

Motorola, Inc. - Schaumburg IL

H03D 1/06
H03D 11/04
H03K 5/01
H04B 1/10
H04L 1/00

375348, 375238, 375239, 375242, 375256, 375257, 375286, 375353, 3072001, 329300, 329304, 341126, 455130, 455296

A direct sequence spread spectrum (DSSS) receiver () consistent with certain embodiments has a frequency generator () that generates a local oscillator signal without use of a piezoelectric crystal. A frequency converter () receives the local oscillator signal and mixes the local oscillator signal with a received DSSS signal to produce a down-converted signal. The received DSSS signal is encoded using a first set of DSSS code. A differential chip detector () receives the down-converted signal and converts the down-converted signal to a differentially detected signal. A correlator () receives the differentially detected signal and correlates the detected signal with a set of DSSS codes that are time-shifted from the first set of DSSS codes. This abstract is not to be considered limiting, since other embodiments may deviate from the features described in this abstract.

7339976, Mar 4, 2008

Jul 18, 2005

11/183683

Edgar H. Callaway - Boca Raton FL, US
Paul E. Gorday - West Palm Beach FL, US
David B. Taubenheim - Plantation FL, US

Motorola, Inc. - Schaumburg IL

H04B 1/00

375136, 375142, 375150, 375343

A method and apparatus for reducing power consumption within a wireless receiver is provided herein. Particularly, the use of partial chip sequence correlation to reduce the average power consumption of a direct sequence spread spectrum (DSSS) wireless transceiver is provided herein. During operation, the receiver will attempt to correlate, or de-spread, less than all chips that constitute a symbol. A partial correlation may be performed on M chips, where M may be much less than N, the number of chips that represent a whole symbol. In a preferred embodiment, the M chips are the first M chips in the symbol.

7400595, Jul 15, 2008

Dec 20, 2004

11/017274

Edgar H. Callaway - Boca Raton FL, US
Monique J. Bourgeois - Sunrise FL, US

Motorola, Inc. - Schaumburg IL

G08C 17/00

370311, 370338, 4553433, 455574

An “identical beacons” field () is inserted near the beginning of a transmitted beacon () that contains either an integer equal to the number of consecutive identical beacons sent (i. e. , identical to the one presently being transmitted) or a repetition bit indicating whether or not the beacon contains changed information when compared to a prior-sent beacon. After sleeping awhile, a node (-) wakes up, receives a first portion of the beacon containing the identical beacons field, and analyzes the identical beacons field. Based on the analysis, the node makes a decision on whether to remain “awake” for reception of the remaining beacon or to return to sleep.

20020009158, Jan 24, 2002

Sep 28, 2001

09/967282

Slim Souissi - Ft. Worth TX, US
Edgar Callaway - Boca Raton FL, US

H04L027/04
H04L027/12
H04L027/20
H04L027/06

375/295000, 375/341000

A transceiver device (or ) operates as a source of a data transmission in a communication system () capable of dynamically allocating spectrum for transmission of the data transmission between the transceiver device () and a second transceiver device (). The transceiver device () includes a transmitter, a receiver coupled to the transmitter and a processor or controller () coupled to the transmitter and receiver. The transceiver device is programmed to monitor the spectrum (channels -of FIG. ) to determine if a portion (channels -for example in time slot ) of the spectrum is available. The transceiver determines what portion of the spectrum is desired for data transmission and then transmits (see time slots and ) the data transmission within a dynamically selected portion of the available spectrum.

20020106995, Aug 8, 2002

Feb 6, 2001

09/777767

Edgar Callaway - Boca Raton FL, US

H03C007/02

455/101000, 455/562000, 455/277100, 375/267000

A wireless information device () receives and processes a message () within a wireless information communication system (). The wireless information device () includes an antenna system (), a radio frequency switch (), a controller () and a display (). The antenna system has a plurality of antennas for receiving the message (). The radio frequency switch () activates a first antenna () of the plurality of antennas as an active antenna () in response to an antenna control signal () sent from the controller (). The antenna control signal () is generated by the controller () in response to the determination of the display orientation of the display ().

20020126627, Sep 12, 2002

Mar 9, 2001

09/803322

Qicai Shi - Coral Springs FL, US
Jian Huang - Coral Springs FL, US
Edgar Callaway - Boca Raton FL, US

G08C017/00

370/311000

A low power consumption protocol for low power communication devices attached to an asynchronous network is described. In this protocol, a communication device is used as a high communication duty cycle Mediation Device (MD), thus permitting other communication devices to use a low communication duty cycle framing structure. The MD functions as a storage and retrieval service for messages between two devices when one device is not able to communicate. When the previously unavailable device becomes available, it can check in with the MD to retrieve any missed messages and respond to these messages accordingly. In a communication network, each of the low power communication devices can be configured to behave as MD's for a small amount of time. Sharing this responsibility among all communication devices in the network allows each device to maintain an low average communication duty cycle. This technique is applicable to a low power, low cost, zero-configuring, self-organizing, asynchronous network.

20020126738, Sep 12, 2002

Mar 9, 2001

09/803258

Edgar Callaway - Boca Raton FL, US
Frederick Martin - Plantation FL, US
Qicai Shi - Coral Springs FL, US

H04B001/69

375/141000

A signaling system is provided in which a spread spectrum code is cyclically shifted by a cyclical shift dictated by a bit pattern of one or more bits. The cyclically shifted spread spectrum code is used to modulate a carrier frequency, and transmitted from a transmitter to a receiver. At the receiver the signal including the cyclically shifted spectrum code is demodulated to recover the cyclically shifted code. The cyclical shift is then determined and the bit pattern which is associated with the cyclical shift is output. The method can be used in direct sequence spread spectrum communication.

20020168943, Nov 14, 2002

Apr 30, 2001

09/845467

Edgar Callaway - Boca Raton FL, US
Matthew Perkins - Sunrise FL, US
Qicai Shi - Tamarac FL, US
Neal Patwari - Plantation FL, US

H04B017/00

455/067100, 455/456000, 455/067400, 455/449000, 455/524000

A technique for intra-piconet location determination and tomography is described. This technique uses received signal strength indicator (RSSI) values in conjunction with transmitted power levels to determine the relative location of each device within a small network employing frequency hopped spread spectrum transmission. In addition to the location determination properties of the invention, the geometry of the devices in the network, as well as the path loss information between pairs of devices, may be used to infer the location of absorbers and reflectors within the piconet. This absorption and reflection information may be used in creating the piconet tomography. The approach described in this specification may be applied in conjunction with the Bluetooth wireless Personal Area Network (PAN) specification to determine device locations, mitigate the effects of multi-path, and perform indoor location and security functions, and other application functions requiring cost-effective location determination.