A system and method for communicating information signals using spread spectrum communication techniques. PN sequences are constructed that provide orthogonality between the users so that mutual interference will be reduced, allowing higher capacity and better link performance. With orthogonal PN codes, the cross-correlation is zero over a predetermined time interval, resulting in no interference between the orthogonal codes, provided only that the code time frames are time aligned with each other. In an exemplary embodiment, signals are communicated between a cell-site and mobile units using direct sequence spread spectrum communication signals. In the cell-to-mobile link, pilot, sync, paging and voice channels are defined. Information communicated on the cell-to-mobile link channels are, in general, encoded, interleaved, bi-phase shift key (BPSK) modulated with orthogonal covering of each BPSK symbol along with quadrature phase shift key (QPSK) spreading of the covered symbols. In the mobile-to-cell link, access and voice channels are defined. Information communicated on the mobile-to-cell link channels are, in general, encoded, interleaved, orthogonal signaling along with QPSK spreading.

System and method for generating signal waveforms in a CDMA cellular telephone system

In a data communication system capable of variable rate transmission, high rate packet data transmission improves utilization of the forward link and decreases the transmission delay. Data transmission on the forward link is time multiplexed and the base station transmits at the highest data rate supported by the forward link at each time slot to one mobile station. The data rate is determined by the largest C/I measurement of the forward link signals as measured at the mobile station. Upon determination of a data packet received in error, the mobile station transmits a NACK message back to the base station. The NACK message results in retransmission of the data packet received in error. The data packets can be transmitted out of sequence by the use of sequence number to identify each data unit within the data packets.

Method and apparatus for high-rate packet data transmission

A method and apparatus for tracking items automatically is described. A passive RFID (Radio Frequency IDentification) tag is used with a material tracking system capable of real-time pinpoint location and identification of thousands of items in production and storage areas. Passive RFID tags are attached to the item to be tracked, remote sensing antennas are placed at each remote location to be monitored, interrogators with several antenna inputs are connected to the sensing antennas to multiplex the antenna signals, and a host computer communicates with the interrogators to determine item locations to an exacting measure.

RFID material tracking method and apparatus

The system provides a gestural interface to various visually presented elements, presented on a display screen or screens. A gestural vocabulary includes ‘instantaneous’ commands, in which forming one or both hands into the appropriate ‘pose’ results in an immediate, one-time action; and ‘spatial’ commands, in which the operator either refers directly to elements on the screen by way of literal ‘pointing’ gestures or performs navigational maneuvers by way of relative or “offset” gestures. The system contemplates the ability to identify the users hands in the form of a glove or gloves with certain indicia provided thereon, or any suitable means for providing recognizable indicia on a user's hands or body parts. A system of cameras can detect the position, orientation, and movement of the user's hands and translate that information into executable commands.

System and method for gesture based control system

A programmer operating in association with a diverse number of implantable medical devices (IMDs) is in a bi-directional operable data, voice and video communications with a remote web-based expert data center. The programmer is in telemetric wireless communications with the IMDs. The data center is equipped to manage the operational and functional aspects of the programmer remotely thus importing expertise to the patient environment. Specifically the communications scheme is scalable and adaptable to enable high-speed interactions between the programmer and the remote center across various communications media. The remote center is able to remotely assess, monitor, evaluate for failure or conduct other performance checks on the programmer to implement a remote solution to those problems. Specifically, by utilizing the robust communication scheme integrated with the remote web-based expert data center, the system enables a real-time deployment of executable software commands to manage the programmer by remotely monitoring, updating software, performing remote repairs or replacement of components and alerting operators to significant problems before they become critical to the optimal performance and reliability of the programmer.

Apparatus and method for remote troubleshooting, maintenance and upgrade of implantable device systems

A method of selecting handover targets for a communication unit (40) exchanging a communicated signal through a serving base site (10-19) in a digital cellular system. The method uses timing advance to determine a relative distance of a communication unit (40) to the serving base site (10-19). The method comprises the steps of comparing a timing advance value with a first threshold. The first threshold may be equal to a distance one and one-half times the radius of the serving cell. When the timing advance value exceeds the first threshold, a base site frequency list is modified to include base sites non-adjacent the serving base site. The identity of the base sites non-adjacent the serving base sites may be determined from the directionality of communication unit (40). The method further includes the step of selecting a handover target providing highest relative RRSI value to the communication unit (40) from the modified base site frequency list.

Directional handover control in digital mobile radio systems employing maho

A method and apparatus for determining which sector antenna of a sectorized cellular radiotelephone system is receiving the strongest radio signal is disclosed. The signal strength of sector antennas is sequentially sampled, converted to digital representations, and stored according to which antenna received the signal. The digital representations are recalled from storage and the strongest signal along with an identification of the receiving antenna are determined. This determination may be used in the handoff process or in detecting when a remote unit requires a handoff.

Method and apparatus for signal strength measurement and antenna selection in cellular radiotelephone systems

A communication system (100) employs a method (400) and apparatus (101, 113) for mitigating interference (119) produced by a communication unit (113) communicating with a serving base site (101) in the communication system (100). While the communication unit (113) is communicating with the serving base site (101), the communication unit (113) monitors (405) a downlink communication signal (118) transmitted by an alternate base site (105). The communication unit (113) then determines (407) an indicia of signal usability for the monitored downlink signal (118) and adjusts (421) a transmit power of the communication unit (113) based on the indicia of signal usability.

Method and apparatus for mitigating interference produced by a communication unit in a communication system

A fixed site station for cellular systems is disclosed A plurality of radio transceivers are removably disposed in apertures of the common equipment housing and are provided unique parameters of operation by the system controller dependent upon the aperture in which the transceiver is located and the antenna configuration of the cell being served

Cellular radiotelephone land station

A method and apparatus for utilizing voice channel transceivers as temporary scanning receivers in a handoff event for a cellular radiotelephone system is disclosed. Voice channel transceiver identifications are stored in link lists according to priority, sectorization, and last use. When a signal strength measurement is required, those cell sectors having available voice channel transceivers are identified and a table providing optimum transceiver selection is utilized to select those voice channel transceivers which will make the signal strength measurement.

Barry J. Menich

Papers

Directional handover control in digital mobile radio systems employing maho

Method and apparatus for signal strength measurement and antenna selection in cellular radiotelephone systems

Method and apparatus for mitigating interference produced by a communication unit in a communication system

Cellular radiotelephone land station

Scanning receiver allocation method and apparatus for cellular radiotelephone systems