Motorola Corporation

Other

Apple Inc.

James A McDonald

Robert W Furtaw

Bradley Michael Hiben

Richard A Comroe

Arun Sobti

Paul M Bocci

Ross E Ruthenberg

Charles J Malek

William F Pickert

Thomas A Freeburg

Thomas V D'Amico

Thomas A Sexton

Anders A Eklof

Eric Deshan McDonald

Luke David McDonald

William J Wilson

Sophia Viktoria McDonald

Takehiko Tsutsumi

Ralph Arthur Schatz

Board game

A system for generating a short-range wireless data communication link through an over-the-air channel on a predetermined radio frequency (RF) carrier. The system integrates conventional RF techniques into a low-power and low-cost system for establishing short-range wireless data communication. The system generates short-range wireless data communication links between a transmitting unit (,) that transmits an operating signal carrying data, and a receiver unit (,) that receives the operating signal without a synthesizer or a heterodyne scheme.

Method and apparatus for generating a short-range wireless data communication link

A shared spectrum communications unit and system provides communications without interfering with incumbent point-to-point receivers. This system includes a transmitter (e.g., of a PCS device) and a geographical location device which is operatively associated with the transmitter. The geographical locating device determines the position of the transmitter, and provides position information to a frequency authorization device. Geographical information pertaining to the PCS device is compared with the locations of the incumbent point-to-point receivers, using a database of the frequency authorization device including the locations of the point-to-point receivers, and a frequency allocation/authorization is generated to the PCS device when the PCS device is located outside of a predetermined range associated with local point-to-point receivers. An authorized frequency is stored and employed by the frequency authorization device for control of the operating frequency of the PCS device.

Frequency allocation for shared spectrum transmitter based on location

A radio frequency communication system is coupled to a telephone network having automatic number identification (ANI) capabilities for communication thereover. The radio frequency communication system includes at least one relocateable base station (115) which shares a radio frequency channel with stationary communication devices for communicating over predetermined geographic areas. The radio frequency communication system further includes a service center (125) which, in response to a call from a base station (115), receives from the telephone network information indicative of at least a portion of a telephone number from which the base station (115) is calling. The service center (125) determines therefrom whether the base station (115) is located within any of the predetermined geographic areas. When the base station (115) is not located within any of the predetermined geographic areas, the service center (125) transmits an authorization signal over the telephone network indicating that the base station (115) is authorized for radio frequency communication over the shared radio frequency channel.

Method and apparatus for sharing radio frequency spectrum in a radio

A method of allowing use of small, low-power communication systems (20) within the coverage area (11) of larger trunked communication systems. A low-power communication system re-uses the same communication resources used by the larger trunked system whenever sufficient distance exists between large system communication units and the low power system so as to avoid interference. Large system communication units may also be constructed to operate in a dual mode format so as to transmit and receive in a low power mode and on re-used resources, whenever near a low power system or to transmit and receive in a high power mode whenever else necessary.

On-site system frequency sharing with trunking system

A radio frequency communication system is coupled to a telephone network (130) having automatic number identification (ANI) capabilities for communication thereover. The radio frequency communication system includes at least one relocateable base station (115) which shares a radio frequency channel with stationary communication devices (105) for communicating over predetermined geographic areas (110). The radio frequency communication system further includes a service center (125) which, in response to a call from a base station (115), receives from the telephone network (130) information indicative of at least a portion of a telephone number from which the base station (115) is calling. The service center (125) determines therefrom whether the base station (115) is located within any of the predetermined geographic areas (110). When the base station (115) is not located within any of the predetermined geographic areas (110), the service center (125) transmits an authorization signal over the telephone network (130) indicating that the base station (115) is authorized for radio frequency communication over the shared radio frequency channel.

Shown, herein, is a method of allowing use of small, low-power communication systems within the service coverage area of larger trunked systems. The small, low-power systems are constructed to reuse at least some of the communication resources, also used by the larger system. The large system measures signal strength values of large cell communication units and transfers such values to the small systems. A small system compares the transferred values with a threshold and when the threshold is exceeded, reuses the communication resources under a TDM format within the small system.

On-site/trunking system frequency sharing

In frequency-hopping spread-spectrum systems, it is necessary to maintain frequency and bit synchronization (sync) between the transmitter and receiver in order to maintain quality data recovery at the receiver. A protocol is described which includes a synthesizer lock field (109) to allow frequency sync, a clock sync field (123) to achieve quick clock sync, and a data sync field (125) to provide data sync. Other fields are provided in the protocol to allow both voice (141) and data (127) transmissions, inband signalling (139), and error correction (143). A method and apparatus, driven by a microprocessor (303) and ASIC (301) combination, are described that generate and transmit this protocol.

Digital communication signalling system

Shown, herein, is a method of allowing use of small, low-power communication systems within the service coverage area of larger trunked systems. The small, low-power systems are constructed to reuse at least some of the inbound frequencies of communication resources, also used by the larger system. The large system measures signal strength values of large cell communication units and transfers such values to the small systems. A small system also measures the signal strength and compares the measured and transferred values with thresholds and when the thresholds are exceeded, reuses the communication resources under a TDM format within the small system.

Near-field on-site/trunking system frequency sharing

A way of allowing small, low-power communication units to reuse trunked system communication resources within the service coverage area of the larger trunked system without experiencing significant interference from the trunked system. The low power units (requestors and targets) avoid interference through spread spectrum transmissions.

On-site system frequency sharing with trunking systems using spread

A conference call feature is offered for use with spread spectrum cordless communication systems. The conference call feature is achieved through the alternate use of redundant communication resources by units on the conference call. The redundant communication resources in spread spectrum communication systems transmit duplicate copies of messages in high noise environments. In residential environments, noise tends to be less of a problem and can, hence, be used to support a conference call feature.

Conference call feature for spread spectrum cordless telephone

In frequency-hopping spread-spectrum systems, it is necessary to maintain frequency and bit synchronization (sync) between the transmitter and receiver in order to maintain quality data recovery at the receiver. Two transmissions in adjacent hop-time intervals may overlap because of various time delays within the system. Collision bits (203 and 207) are used to realign the transmitted messages in time. The base station (103) manufactures (401) the collision bits (203 and 207) and transmits them to the communication unit (101), which echoes back (503) the bits on its next transmission. If the bits received at the base station do not match the bits sent (407), the base station (103) initiates (409) collision maintenance such that the communication unit (101) can adjust its DPLL (331) to realign its transmissions in time.

Signal overlap detection in a communication system

A method and apparatus is provided for synchronizing a spread spectrum communication site. The communication site receives a spread message signal from over a radio communication channel. Subsequently, the communication site synchronizes the received spread message signal with an estimate of the received spread message signal. The estimated received signal is a function of a predetermined message signal and a predetermined spreading code. The received and the estimated received spread message signals are synchronized by using a sliding correlator to incrementally increase the phase shift between the received and the estimated received spread message signal until the received and the estimated received spread message signals are synchronized. The communication site limits the increase of the phase shift between the received and the estimated received spread message signal to a predetermined maximum phase shift magnitude which is derived from known operating environment parameters of the spread spectrum communication site.

Method and apparatus for providing signal synchronization in a spread

An electromagnetic system for more efficiently utilizing energy wherein an outside power source is utilized to rotate a flywheel to a predetermined velocity. A plurality of armatures mounted on the periphery of the flywheel pass through a plurality of magnetic fields generated by stationary coils mounted at radially spaced locations around the rotating flywheel. The magnetic fields are generated by an electric current from a circuit that is so arranged that the magnetic fields are generated and collapsed in time relationship to the rotary movement of the armatures such that, as the armatures approach the magnetic field, they are drawn toward the center of the magnetic field at which point the magnetic field collapses and is regenerated with a reverse polarity so as to repel the armature from the center of the magnetic field whereby the flywheel rotation is maintained at the desired velocity.

Electromagnetic system

First and second batteries each connected in parallel with a load and a battery isolator connected between the first battery and the second battery and the load including a series pass transistor connected in series with the first battery and the load and circuitry for comparing the voltage across the load to the voltage across the first battery and turning off the series pass transistor when the voltage of the first battery drops below the voltage at the load plus a predetermined offset voltage, which offset voltage is developed by the battery isolator. The battery isolator operates like a diode isolation circuit having a near perfect diode therein.

Growing community of inventors

Buffalo Grove, IL, United States of America

James A McDonald