Abstract: A method of adjusting transmit power in a CDMA portable phone to maintain adjacent channel power rejection (ACPR) passing margin includes the steps of amplifying a first radio frequency (RF) signal according to a first gain to produce a second RF signal, and amplifying the second RF signal according to a second gain to produce a third RF signal. A desired power level of the third RF signal is determined and a new gain value is computed from the desired power level. The first gain value is adjusted to the new value. A system for adjusting transmit power in a CDMA portable phone to maintain adjacent channel power rejection (ACPR) passing margin includes an automatic gain control (AGC) amplifier having an AGC input terminal, an AGC output terminal, and a control signal input terminal. The system also includes a power amplifier (PA) having a PA input terminal and a PA output terminal, wherein the PA input terminal is connected to the AGC output terminal.

Abstract: A system and method for selecting from a plurality of data service options in a wireless communication system having mobile data service support. The system comprises a terminal device includes a terminal device for originating a call and transmitting and receiving data in accordance with a selected data service option. The terminal device includes a communications interface for inputting a sequence of one or more alpha-numeric characters representing an AT dial command string in order to originate the call and for including information that indicates the selected data service option. The system also includes a communication device, coupled to the terminal device, for interfacing with the wireless communication system and for sending signaling messages to the terminal device. The communication device receives the AT dial command string from the terminal device and examines the contents of the received AT dial command string.

Abstract: A system and method for accounting for clock slew during autobauding. Upon identifying an AT command and the baud rate of the incoming data stream, the present invention accounts for clock slew in one of two ways, depending upon the baud rate of the incoming data stream. If the baud rate of the incoming data stream is 9600 or greater, the present invention accounts for slew by utilizing a feature associated with ASCII characters and RS-232 protocol, that is the stop bit being nicely framed on both sides by spaces. This feature is used to determine whether negative or positive clock slew exists. If negative clock slew exists and it is determined that negative clock slew falls within a certain threshold, a sample is skipped. If positive clock slew exists and falls within a certain threshold, positive clock slew is converted to negative clock slew by taking an extra sample.

Abstract: A spreader architecture for direct sequence spread spectrum communications is disclosed. This single architecture can perform OOK, BPSK, or QPSK spreading modulation of a carrier. In the QPSK and BPSK modes, input data is spread by pseudonoise signals to produce digital representations of phase-modulated baseband in-phase and quadrature components. In the OOK mode, the spectrum of the baseband components is selectively spread according to the input data. In an exemplary application, the various modulation modes are used to encode the control and traffic channels of a code-division multiple-access cellular telephone system.

Abstract: A method to enhance performance of a dual-mode or dual-band mobile phone includes, after the phone has initially connected to a CDMA wireless network, monitoring a level of total power received by the phone. This power level is compared to a preset threshold level. If the power level remains below the threshold level for over two seconds, the dual-mode or dual-band phone switches to an AMPS or other network retrieved from the preferred roaming list that is stored in the phone. If the power level is above the threshold, the phone moves into the idle state. Once in the idle state, both the pilot strength and Received Signal Strength Indication are monitored. If both of these levels are below respective thresholds for over eight seconds, the phone switches to another network stored in the preferred roaming list. If the mobile phone is not a dual-mode or dual-band phone, the mobile phone can perform similar measurements and switch between service provider systems compatible with the mobile phone.

Abstract: A system and method for aiding emergency service providers in locating an incapacitated individual by use of a wireless communications device. The invention has two major modes of operation based upon whether the line of communication between the handset and call destination is open or closed. If the connection between the handset and the call destination is open, the audible beacon periodically generates a preselected tone through the built-in speaker of the telephone. The audible beacon may be initiated from the call destination location, after there has been an established link between the telephone and the call destination, whether the connection is open or closed. Once the audible beacon is initiated, the stored volume settings of the handset are replaced by the volume settings of the audible beacon system and the preselected tone of a telephone ringer or a beep. The tone remains activated until manually turned off.

Abstract: A first printed wiring board (PWB, 102) has a first set of parallel printed wires (108) on one face and a second set of parallel printed wires (214) on the other face. The second set is generally orthogonal to the first set. The first set terminates in a first adaptor (110), which adapts to an interface (1034) having many parallel channels. The second set terminates in a second adaptor (112), which adapts to a second PWB (1036). Development of the second PWB is enhanced when any input or output on the second PWB can be connected to any channel of the interface. Thus, a hole is drilled through the first PWB at the intersection of the appropriate printed wires of the first and second sets, and is plated. The plated hole (416) may be drilled out (rendering it non-conductive) and effectively replated many times. Alternatively, the (inexpensive) first PWB may be replaced.

Abstract: A wireless telephone (302) digitizes the voice of the user in response to the depression of a push-to-talk button (110), either physical or virtual. It sends the digitized voice, in data mode, to a base station (308). The base station places the data, through the Internet, or an Intranet or Extranet, on a server (312). Other wireless phones (304)-(306) recover the data from the server through the same (308) or different (310) base station, through the Internet, Intranet, or Extranet, and convert the data back to digitized voice. The base stations transmit the digitized voice to other wireless telephones (306), which convert them back to voice in response to the recognition of voice frames on the data channel by the CODEC manager software. Networked computers (314) may be configured to emulate a combined base station and wireless telephone.

Abstract: A wireless communication device contains a prefix storage area containing one or more prefixes that may be automatically pre-pended to a destination telephone number. The destination telephone number may be entered manually by the user using a keypad or automatically entered from a telephone number storage area. The system analyzes the destination telephone number and determines whether one or more prefix pre-pending levels have been enabled. If enabled, the system automatically pre-pends the selected prefixes to the user-entered destination telephone number to generate a complete destination telephone number. The automatic pre-pending can extend to all telephone numbers entered by the user, or may be limited to telephone numbers in the telephone number storage area. Similarly, the system can be enabled continuously, or may be disabled when the user turns off the wireless communication device.

Abstract: A receiver that downconverts input signals modulated using first, second, third and fourth modulation formats to a common intermediate frequency range. The first and second modulation formats are transmitted to the receiver in a first frequency range, the third modulation format is transmitted to the receiver in a second frequency range, and the fourth modulation format is transmitted to the receiver in a third frequency range. The input signals are provided to first, second and third band selection filters that respectively select first, second and third frequency ranges. A first downconverter is coupled to an output of the first band selection filter, and downconverts signals from the first frequency range to the common intermediate frequency range.

Abstract: A passive suspension system for supporting an instrument relative to a rigid support structure while preserving angular alignment of the instrument. The suspension system includes an instrument platform, the instrument being secured to the platform, and first and second vibration isolator systems. The first ends of the isolator systems are attached to the rigid support structure so that axes of the vibration isolators extend transverse to the instrument axis. The first and second isolator systems resist motion transverse to the instrument axis and provide shock and vibration isolation transverse to the instrument axis. First, second and third stabilizing struts extend parallel to each other and the instrument axis, and are of equal length. A first set of bearings connects ends of the struts to the instrument platform in a spaced relationship, and allows motion transverse to the struts. A second set of bearings connects opposing ends of the struts to the rigid support structure in a spaced relationship.

Abstract: A method and apparatus for determining the position of a wireless communication device using global positioning system (GPS) satellites, base stations synchronized to GPS time and base stations that are unsynchronized with GPS time. The unsynchronized base stations are synchronized with one another. Time of arrival information is adjusted to take into account the fact that wireless communication devices that received GPS time information from a base station receive that information biased by the one-way delay that is encountered by the signal that communicates that information to the wireless communication device. In addition, time difference of arrival information for base stations that are not synchronized to GPS time allows the bias between these base stations GPS time to be eliminated.

Abstract: A Voltage Controlled Oscillator (VCO) with the ability to tune its operating frequency over a wide range using a limited control voltage range. The VCO implements a novel resonant circuit that provides the wide frequency tuning range and simultaneously provides increased immunity to induced low frequency noise. The resonant circuit utilizes an element configuration that includes high pass filters on each input to the resonant circuit. Varactor diodes are used to couple a conventional tuning circuit to the remainder of the resonant circuit. This configuration allows the resonant frequency to tune over a wide range using a limited control voltage range.

Abstract: A mobile telephone system and a method for answering a mobile telephone incoming call by a user's verbal command, to allow hands-free voice. The mobile telephone system includes a carkit and a mobile telephone. The mobile telephone has a programming key for pre-programming the user's voice greeting, a keypad for answering the call in telephone mode, a microphone for entering a user's verbal command for answering the call in carkit mode, a digital processor connected to the microphone for performing spectrum analysis and feature extractions of the user's verbal command in carkit mode, and a memory connected to the digital processor, having a database for storing the user's pre-programmed voice greeting digitized speech pattern. The pre-programmed voice greeting may be a factory-programmed voice greeting or the user's pre-programmed voice greeting, if previously initialized after pressing the programming key.

Abstract: A low power sample rate converter adapted for use with a telecommunications system transceiver. The sample rate converter includes a first circuit that provides an input signal characterized by a first sample rate and a delayed version of the input signal. A second circuit periodically multiplies, at a second sample rate, samples in the input signal by a first predetermined coefficient in accordance with a predetermined transfer function and provides a first signal in response thereto. A third circuit periodically multiplies, at the second sample rate, samples in the delayed version of the input signal by a second predetermined coefficient in accordance with the predetermined transfer function and provides a second signal in response thereto. A fourth circuit combines the first signal and second signal providing a rate-converted version of the input signal as an output signal in response thereto.

Abstract: A portable phone has a cavity at one end in which a hinge pin is rotatably mounted, with opposite ends of the hinge pin releasably secured to a flip panel rotatable between a closed position extending over part of one face of the phone, and an open position. The hinge pin includes a cam formation, and a biasing spring secured in the cavity has a bearing portion acting against the cam portion to releasably retain the flip panel in its open and closed positions. A cam retainer is mounted in the cavity to extend over the hinge pin and resist bending of the hinge pin out of a straight, axial orientation.

Abstract: The present invention discloses a system and system of performing an add-compare-select butterfly operation in an implementation of the Viterbi algorithm. The system includes a first memory element for storing a plurality of source state metrics. The first memory element is coupled to a multiplexer which is capable of selecting between a first and second operating path based on even and odd clock cycles. The multiplexer is coupled to an add-compare-select mechanism, which calculates the target state metrics for each of the source state metrics. A second storage element, coupled to the add-compare-select mechanism and the multiplexer, is used to temporarily store the target state metrics while a third storage element stores a predetermined logic bit which corresponds to the lowest value target state metric.

Abstract: A method and circuit for controlling a mobile station operating in a slotted paging environment. The circuit comprises a low power clock for generating a low frequency clock signal; a clock signal generator for generating a high frequency clock signal; a synchronization logic circuit for synchronizing the low frequency clock signal to the high frequency clock signal; a frequency error estimator for measuring an estimated low frequency clock error; and a sleep controller for removing power from the clock signal generator for the corrected sleep duration value, thereby conserving power between assigned paging slots. During the awake time, the low frequency clock signal is resynchronized to the high frequency clock, thereby correcting for any frequency error in the less accurate low power clock during sleep mode.

Abstract: Method and apparatus providing enhanced sensitivity for GPS receivers by allowing coherent integration of a correlation over several code periods of a GPS signal in one embodiment, and by performing a time to frequency domain conversion to the output from a correlation processor in a second embodiment. In the case in which coherent integration is performed over several code periods, advantage is taken of the fact that CDMA cellular telephone base stations transmit information that allows the receiver to determine GPS time before beginning a GPS signal acquisition process. The integration can be expanded to include code periods from more than one bit period, if the GPS receiver takes advantage of the fact that known bit patterns are transmitted at particular times within the transmission from a GPS satellite.

Abstract: The present invention is a novel and improved method and apparatus for performing position location in wireless communications system. One embodiment of the invention comprises a method for performing position location on a subscriber unit in a terrestrial wireless telephone system using a set of satellites each transmitting a signal, the terrestrial wireless telephone system having base stations, including the steps of transmitting an aiding message from the base station to the subscriber unit, said aiding message containing information regarding a data boundary for each signal from the set of satellites, applying correlation codes to each signal yielding corresponding correlation data and accumulating said correlation data over an first interval preceding a corresponding data boundary yielding a first accumulation result, and a second interval following said corresponding data boundary yielding a second accumulation result.