Abstract: A distributed voice recognition system and method for obtaining acoustic features and speech activity at multiple frequencies by extracting high frequency components thereof on a device, such as a subscriber station and transmitting them to a network server having multiple stream processing capability, including cepstral feature processing, MLP nonlinear transformation processing, and multiband temporal pattern architecture processing. The features received at the network server are processed using all three streams, wherein each of the three streams provide benefits not available in the other two, thereby enhancing feature interpretation. Feature extraction and feature interpretation may operate at multiple frequencies, including but not limited to 8 kHz, 11 kHz, and 16 kHz.

Abstract: Techniques to search for pilots over code space in a CDMA system. In one aspect, the pilot search is performed using a number of substages, and the search windows for each substage are selected such that the relevant code space is searched while reducing search time. In one specific implementation, two substages are used to search for pilots. The detect substage searches through (e.g., fixed-size) search windows to detect for peaks in the received signal. The dwell substage then searches through (e.g., variable-size) search windows to re-evaluate the detected peaks and remove noise peaks. The dwell windows may be formed such that a code space as small as possible is searched (to reduce search time) but large enough to account for possible drift in the detected peaks. Variable number of peaks may be provided by the dwell substage for the variable-size dwell windows.

Abstract: A novel and improved method and apparatus for performing closed loop forward link power control using a selected dedicated and power controlled forward link signal is described. A “Selected Signal Bit Error Rate” (SSBER) is estimated, where each selected signal “bit” consists of a number selected signal chips distributed over a frame. In addition, the method estimates the normalized variance of the signal energy (or C/I) for each packet. The average number of fingers in lock is also used to determine the power control set point.

Abstract: In a communication system, a method and an accompanying apparatus determine a number of available fingers (110A-N) in a receiver (100). A controller (121) adjusts a threshold based on the determined number of the available fingers (110). The adjusted threshold may be one of, or any combination of, a pilot signal search threshold, a lock/unlock threshold, and a combine/un-combine threshold. The number of available fingers (110) may change after the threshold is adjusted.

Abstract: A programmable capacitor bank includes multiple tuning elements. Each tuning element includes two tuning capacitors and a pass transistor that electrically connects or disconnects the capacitors to/from common nodes. For a thermometer decoded capacitor bank, the tuning capacitors for all tuning elements have equal capacitance. Each tuning element further includes at least one pull-up transistor that provides high bias voltage for the pass transistor and at least one pull-down transistor that provides low bias voltage for the pass transistor. The multiple tuning elements may be arranged in a ladder topology such that (1) the tuning elements are turned on in sequential order starting from one end of the ladder and going toward the other end of the ladder and (2) each tuning element receives biasing from a preceding tuning element and provides biasing to a succeeding tuning element. The capacitor bank may be used for VCOs and other circuits.

Abstract: Methods and apparatus for scheduling grant channels to carry grant messages to a plurality of scheduled mobile stations. The scheduling of grant channels involves dynamically assigning to a current mobile station of the plurality of scheduled mobile stations, a previously unassigned grant channel from a list of grant channels monitored by the current mobile station. If there are more mobile stations to be processed in the plurality of scheduled mobile stations, then the scheduling moves to a next mobile station in the plurality of scheduled mobile stations, and the assignment process is repeated. Furthermore, if not every grant channel has been assigned a mobile station, then the order of the plurality of scheduled mobile stations is rearranged, and the assignment and the movement processes are repeated.

Abstract: An apparatus for wireless communication, including a plurality of slave transceivers spatially separated from one another within an enclosed region. Each of the slave transceivers is adapted to receive a reverse radio frequency (RF) signal generated by a mobile transceiver within the region. Furthermore, each slave transceiver processes the RF signal based on at least one adjustable operational parameter and generates a reverse slave signal. Each of the slave transceivers includes an associated slave central processing unit (slave-CPU) adapted to control at least one adjustable operational parameter of the slave transceiver. Control is provided in response to at least one characteristic of the reverse RF signal. The apparatus also includes a master transceiver. The master transceiver is coupled to receive and process the reverse slave signals from the plurality of slave transceivers. Corresponding reverse master signals are then generated by the slave transceiver.

Abstract: The invention is a method for limiting the peak transmit power in a CDMA communication system. At least one of first and second high transmit power regions are separated into a plurality of high transmit power subregions. The high transmit power subregions of the plurality of high subregions are shifted by time offsets of differing durations to provide a plurality of time offset subregions. First and second low transmit power regions are also provided. At least one of the first and second low transmit power regions is also separated into a plurality of transmit power subregions and the low transmit power subregions are shifted by time offsets of differing time durations. The subregions can be time offset by a predetermined time duration or by a random time duration.

Abstract: The described embodiments provide devices and methods for creating an electrical connection in an electronic system. The devices and methods include a standoff that connects a circuit element with a circuit board and supports the circuit element at a sufficient height above the circuit board to create an additional layout area. The additional layout area may be utilized to mount additional circuit elements to the circuit board.

Abstract: In a dual mode Bluetooth/wireless mobile unit, the next sleep mode Bluetooth wakeup time is rescheduled to synchronize with any upcoming idle mode wireless wakeup time that will otherwise precede the Bluetooth wakeup time. The Bluetooth clock is advanced, or other reconfiguration made to the Bluetooth module, as appropriate to prevent the scanning frequency from changing during a sleep mode Bluetooth wakeup/scanning interval commencing at the resynchronized Bluetooth wakeup time.

Abstract: A novel method and apparatus is disclosed for performing seamless handoff of a mobile station (MS) between Radio Access Networks (RANs) that use different types of wireless interfaces. The described embodiments enable an MS to handoff between different RANs without causing routing ambiguity, and without substantial loss of network data. Upon moving from the coverage area of a first RAN using a first wireless interface to the coverage area of a second RAN using a second wireless interface, an MS determines whether routing ambiguity may result from the change of RAN and, based on the determination, triggers a re-registration of its network address. A foreign agent (FA) within a packet data serving node (PDSN) monitors network address re-registrations in order to determine whether multiple RAN-PDSN (R-P) connections are being created for the same MS. Based on this determination, the PDSN terminates redundant R-P network connections resulting from movement of the MS between different RANs.

Abstract: In a system, method, and apparatus according to an embodiment of the invention, traffic on a basic access channel and a reserved access channel is managed to maximize use of the basic access channel while minimizing delays.

Abstract: A method and apparatus for arbitrating between a first communication device having floor control in a group communication network and a second communication device competing for floor control provides receiving a floor-control request from the second communication device, comparing respective priority levels of the first communication device and the second communication device, and granting floor control to the second communication device if the second communication device has a higher or equal priority level. In one embodiment, the controller receives the request for floor control from a push-to-talk (PTT) device.

Abstract: A system and method for detecting a correct transmission format upon encountering a decoding error in a variable-format transmission scheme, wherein the decoding error results from an unsuccessful decoding of a frame. The invention provides for prioritizing the permissible formats, resulting in a prioritized order. The frame data is then decoded according to one or more of the permissible formats in the prioritized order, and if the decoding is successful in accordance with one of the formats, that format is selected as the correct transmission format.

Abstract: System for providing transitions between operating modes of a device. The system includes a method for providing transitions between a privileged and a non-privileged operating mode. The method comprises executing an application in the non-privileged mode, generating an interrupt to request the services of a privileged function, and transitioning to the privileged mode to execute the privileged function, wherein the privileged function is executed as part of the same thread of execution as the application.

Abstract: Techniques for controlling the transmit power for a number of data streams in a wireless multi-channel (e.g., MIMO) communication system. In one method, a number of received symbol streams are initially processed in accordance with a particular (e.g., CCMI, CCMI-SC, MMSE, or MMSE-SC) receiver processing technique to provide a number of detected data streams. The post-detection SNRs of the detected data streams are estimated, and each SNR that exceeds a setpoint is identified. This setpoint may correspond to (1) the SNR needed to achieve the maximum allowed spectral efficiency or (2) the target SNR needed to achieve a specified spectral efficiency. A new (or adjusted) transmit power for each detected data stream associated with a post-detection SNR that exceeds the setpoint is determined and used for the data stream. Different power control schemes are provided for different classes of receiver processing techniques with different characteristics.

Abstract: A direct downconversion receiver architecture having a DC loop to remove DC offset from the signal components, a digital variable gain amplifier (DVGA) to provide a range of gains, an automatic gain control (AGC) loop to provide gain control for the DVGA and RF/analog circuitry, and a serial bus interface (SBI) unit to provide controls for the RF/analog circuitry via a serial bus. The DVGA may be advantageously designed and located as described herein. The operating mode of the VGA loop may be selected based on the operating mode of the DC loop, since these two loops interact with one another. The duration of time the DC loop is operated in an acquisition mode may be selected to be inversely proportional to the DC loop bandwidth in the acquisition mode. The controls for some or all of the RF/analog circuitry may be provided via the serial bus.

Abstract: A technique for calibrating the open-loop transmit power of a wireless communication device overcomes the inherent nonlinearities in the gain control input of a variable gain amplifier (VGA). In one embodiment, a feedback circuit generates a signal indicative of the transmit power. This signal is compared with a desired transmit power level, which comprises an open-loop gain component and a closed-loop gain component. The desired transmit power level is compared with the actual transmit power level and an error signal is generated. The error signal is used to alter the gain of the VGA in the transmitter to thereby adjust the actual transmit power level to correspond with the desired transmit power level. In alternative embodiment, the receiver portion, which also contains a VGA, is pre-calibrated in a conventional manner. During a transmitter calibration process, the transmitter is coupled to the receiver input through a mixer and filter. The pre-calibrated receiver determines the actual transmit power level.

Abstract: A mechanism for securely locking and easily releasing a wireless device in a cradle is comprised of a release button located on an outer housing, accessible to a user. The release button extends through the outer housing to an interior in the cradle. An actuator is disposed in the housing and has an arm extending into the interior receptacle area of the cradle, wherein movement of the arm activates the mechanism. A lever is disposed within the housing and is rotatable between a first and a second position. A first end of the lever is located adjacent to the actuator, while a second end of the lever is located adjacent to the release button. A protrusion extends from the lever into the receptacle area when the lever is in the first position and is housed inside the housing when the lever is rotated to the second position. A spring connects the actuator to the lever.

Abstract: A method and device is disclosed for outer loop power control for communication over a channel employing DTX. A device having DTX detection compensates for a known non-zero probability of DTX detection given an Erasure frame, P(D|E), by determining a compensation factor and adjusting a desired or expected target FER with the compensation factor to achieve a compensated target FER. The P(D|E) may be known or estimated to be a constant value, the value of P(D|E) may also be dynamically determined based on channel conditions. The method and device may also compensate for a non-zero P(E|D), i.e. a probability of an Erasure detection given a DTX. A number of consecutive DTX indications triggers the outer loop to reduce the power control setpoint by a predetermined value or by a dynamically determined value. A dynamic value may be determined from an identified number of Erasure frame detections.