Abstract: The invention includes methods and systems to improve the signal diversity between a repeater and a base station in a wireless communication system. A communications device transmits a wireless signal. The repeater receives two versions of the wireless signal using a first receiver system and a second receiver system. The repeater transmits two versions of the wireless signal that correspond to the two received versions. The repeater transmits the two versions with different signal polarizations so they can be isolated from one another at the base station. The base station receives the two versions from the repeater and isolates each version based on the difference in polarization. The base station processes the two diverse versions to produce a high-quality signal. The use of different polarizations to provide diverse signals between the repeater and the base station lowers signal power requirements and increases the capacity of CDMA systems.
Abstract: The invention is CDMA quadrature signal technology that controls the transmit power of a CDMA signal. The CDMA quadrature signal technology receives a CDMA signal, and in response, process quadrature components of the CDMA signal to generate a power control signal. The CDMA quadrature signal technology adjusts the gain of the CDMA signal in response to the power control signal. A CDMA transmitter transmits the CDMA signal after the gain is adjusted. One example of the CDMA transmitter is a CDMA base station. Using the invention, a multi-sector CDMA base station can control power without transferring gain information to base station components for all sectors. The invention eliminates unnecessary data transfer and storage.
March 10, 1999
Date of Patent:
April 9, 2002
Bruce S. Schwartz, Brian K. Harms, Anthony C. K. Soong, Todd A. Pressley, Robin D. Knight
Abstract: A system for reducing wireless telecommunications network resources required to successfully route calls to a wireline network of the present invention. A first mechanism routes a call originated from a wireless party connected to a wireless network to a wireline party connected to a wireline network. A second mechanism determines if the wireline network is congested in response to the mechanism for routing and provides a signal in response thereto. A third mechanism selectively queues the call in response to the signal. A fourth mechanism connects the wireless party to the wireline party when the call reaches a front of the queue and the wireline network can accept the call. In a specific embodiment, the first mechanism for routing the call includes a mobile switching center in communication with a base station or base station controller. The base station or base station controller communicates with a mobile station associated with the wireless party.
Abstract: A system and method for determining a position of a mobile wireless transceiver. The inventive system merges GPS position location and wireless communication technologies to achieve a precise position location in dense urban and other environments when line-of-sight to the satellites is somewhat obscured. The inventive method uses signals from only two GPS satellites and the serving terrestrial base station. In a most general sense, the inventive method includes the steps of receiving at a base station a first signal transmitted from a first GPS satellite and a second signal transmitted from a second GPS satellite. The mobile transceiver is adapted to receive these GPS signals as well and transmit a third signal to the base station in response thereto. The base station receives the third signal and uses it to calculate the position of the wireless unit. In a specific implementation, the base station sends aiding information to the wireless unit.
Abstract: A method and apparatus for efficiently transmitting location assistance information to a mobile communication device over a control channel with a minimal impact on the capacity of the control channel. A position location server provides a difference between satellite locations which have been computed using Almanac data and then Ephemeris data. Sending only the difference between the locations and clock corrections computed using the two different data types, the total amount of information to be transmitted to a mobile communication device is significantly reduced. Furthermore, by providing rate of change information, the method and apparatus allows the location assistance information to remain valid for a relatively long time after it is has been received by the mobile communication device.
February 12, 1999
Date of Patent:
May 2, 2000
Parag A. Agashe, Alkinoos Hector Vayanos, Samir S. Soliman
Abstract: A battery pack having a battery pack controller that combines the functions of a battery pack protection circuit, battery charger, current and voltage regulator, and a data monitor circuit. In one embodiment, the battery pack controller is implemented as a single integrated circuit (IC). In another embodiment, two external field effect transistors (FETs) are used along with a single IC battery controller. This combination of functions within one IC allows battery pack manufacturers to construct inexpensive and safe battery pack systems that do not require an external charger or a carefully regulated DC power supply to charge the battery pack. In one embodiment a voltage regulator includes a pulse charging circuit for pulse charging the batteries within the battery pack. Advantageously, the battery pack controller further includes a current regulator that regulates a charge current flowing into the first battery cell.
Abstract: A bearing friction testing apparatus includes a bearing support structure having a support arm with a bearing mount for mounting a test bearing with a bi-directional load support ring for attachment to the bearing race with a pendulum attachable to the support ring for adding one direction of force and a tension line attached to the ring for applying a second direction of force transverse to the first direction of force with a pendulum latching device for latching the pendulum in a loaded position and releasing the pendulum with a measuring instrument for measuring the rate of decay in the amplitude of oscillation of the pendulum.