Abstract: A power delivery system for use in a radio frequency system is provided. The power delivery system including a power splitter and at least one sector amplifier that is responsive to the power splitter; where each of the sector amplifiers includes an input switch and an output switch that is responsive to the sector amplifier. The power delivery system also includes a power combiner that is responsive to each of the sector amplifiers; and at least one spare amplifier that is coupled by one or more relays to each of sector amplifiers that operates in conjunction with one or more of the sector amplifiers.

Abstract: A power delivery system (500) including a power splitter (502), a plurality of power amplifier modules (508) responsive to the power splitter (502), a power combiner (504), and a gateway controller (506) is provided. Each of the plurality of power amplifier modules (508) include an input switch (520), a variable attenuator (524), an RF power amplifier (526) responsive to the variable attenuator (524) and the input switch (520), an output switch (530) responsive to the RF power amplifier (526), and an alarm detector (532) for indicating an alarm condition of the RF power amplifier (526). The power combiner (504) is responsive to the plurality of power amplifier modules (508), and the gateway controller (506) is in communication with each of the plurality of power amplifier modules (508).

Abstract: Generally stated, an apparatus and method for routing a digitized radio frequency (RF) signal 140-143 to a plurality of paths is described herein. In accordance with a first preferred embodiment, the apparatus comprises a digital upconverter/modulator (DUC) 125, 129 coupled to a scaling and switching network 100N which is comprised of, at minimum, a first, second, third and fourth digital switch, and a first, second and third adder. Within the scaling and switching network 100N, the first digital switch is responsive to the DUC 125,129. The first adder is responsive to the first and second digital switches, while the second adder is responsive to the third and fourth digital switches. Finally, the third adder is responsive to the first and second adders.

Abstract: A method and apparatus is provided for encoding a signal within a radio frequency transmitter 10. The method includes the steps of dividing an information bit stream into a set of successive representations of constellation symbols, each with a symbol interval and finite impulse response filtering each constellation symbol of the set of successive representations of constellation symbols to produce at least one filtered symbol sample per symbol interval. The method further includes the steps of vector adding the at least one filtered symbol sample per symbol interval of the set of successive representations of constellation symbols to produce an output constellation symbol. An apparatus is provided with means for implementing the steps of the method. Included within the apparatus is a low-overhead means of selecting modulation method.

Abstract: An apparatus and method for recovering data in the presence of error transients is disclosed that includes a received waveform containing an information signal encoded at periodic time instants of a known period for eliminating an undesired amplitude error in the received waveform, where the error is slowly varying with respect to the known periods and recovering the desired periodic time instants. A delay element for delaying the received waveform by an amount equal to the period is included and a subtracting element for comparing the received waveform with the delayed waveform, and providing a timing recovery signal with zero crossing substantially less corrupted by the undesired amplitude error, and an averaging circuitry operating on the timing recovery signal for purposes of recovering the desired periodic time instants aids in recovering data in the presence of error transients.

Abstract: A data communication method provides management and control functions to allow access to a shared radio frequency communication device by multiple concurrently executing software applications. A predetermined set of commands common to all of the software applications enable a consistent, high-level software interface to the communication device. A single computer program controls the communication device and permits simultaneous independent interface to each of the software applications.

Abstract: A method and apparatus for performing authentication in a communication system. The method includes the steps of detecting an unexpected authentication message, updating a counter value, comparing the counter value to a threshold value, and performing an encryption key update operation in response to the comparison between the counter value and the threshold value. The apparatus includes a base station (152), a switching center (128) coupled to the base station (152), and an authentication center (149) responsive to the switching center (128). The switching center (128) detects an unexpected authentication message received by the base station (152). The authentication center (149) updates a counter when the switching center (128) detects the unexpected authentication message and compares the updated counter with a threshold value. The authentication center (149) initiates an encryption key update operation when the updated counter value exceeds the threshold value.

Abstract: A method of testing a speech transcoder is provided for testing a speech transcoder including at least a speech decoder module connected to a PCM format conversion module where the method of testing includes inputting a standard input vector into an input of the decoder module and outputting a reference vector from the PCM format conversion module.In an alternate embodiment, the method of testing a speech transcoder having a first PCM format conversion module connected to a speech coder module includes inputting a reference vector into the first PCM format conversion module and outputting a new vector from the speech coder that is equivalent to standard speech coder output or equivalent to a vector that was generated by inputting standard speech coder input into a combination of two PCM conversion modules and a reference speech coder.

Abstract: An amplifier circuit (100) for use in a radio frequency system. The circuit is comprised of a first amplifier (22) having a first input (20) receiving a first signal (16) and a first output (24). A first coupler (18) samples the first input (20) of the first amplifier (22) and a second coupler (26) samples the first output (24) of the first amplifier (22). A third coupler (36) then compares an output of the second coupler (28) and an output of the first coupler (34), producing an error signal (38) which is substantially indicative of the difference between the first input (20) and the first output (24). A fourth coupler (44) combines the error signal (38) with a second signal (48) to produce a composite signal (50), the second signal (48) at least partially correlated with the first signal (16) received by the first input (20) of the first amplifier. A second amplifier (52) is responsive to the composite signal (50) and produces a second output (54).

Abstract: A system for digital selection diversity includes receiving different versions of a signal sit different antennas (222, 226) of a receiver (210), and processing the different versions on separate branches each having a digital downconverter (224, 228) and filter (232, 236). The filters are controlled by a diversity switch selector (250) so that one acts to filter (the active branch), and the others decimate, their respective input signal versions, based on detected signal quality. The diversity switch selector also controls a demodulator (240) to demodulate the filtered signal. The decimated signals are used to provide both signal quality information, and phase history when a branch becomes active.

Abstract: An RF shield for use on tightly packed printed circuit boards has a normally-closed lid that can be opened to provide repair access to shielded components and then reclosed. The shield is a five-sided metal can having a top surface (12) with a lid defined on one edge by a fold line (20) and on the other three edges by partial shear lines (22, 24, 26) through the thickness of the metal top surface. The shear lines define frangible connections between the lid and top surface (18) that can be severed to allow the lid to open. The fold line serves as a hinge about which the lid can pivot for opening. Upon closing the lid can be spot-soldered to hold it shut.

Abstract: The present invention determines whether two discrete continuous segments of handwritten input S.sub.1 (210) and S.sub.2 (220) form part of the same handwritten input or are part of more than one, separate handwritten inputs. The present method calculates one or more substantially parallel distance disposed substantially parallel to the writing access (210) and compares these distances to one or more predefined thresholds. The predefined thresholds specify minimum distance measures which must be exceeded by the substantially parallel distances for the discrete continuous segments to be judged as belonging to separate segments of handwritten input.

Abstract: A mounting assembly to attach an radio frequency antenna to a housing of a communication device for removably securing the antenna to the communication device, the assembly includes an antenna and a circular base member extending from the antenna. The assembly allows for the quick and easy detachment of the antenna from the device without the use of tools. The communication device to which the antenna assembly is attached has a generally tubular shaped opening defining a communication device housing having a circular cross-section for removably receiving the circular base member. The housing includes an outside face, an inside face, and a recessed locking slot extending from the outside face towards the inside face.

Abstract: A peripheral card header (100) is disclosed including an alignment device (160) and a hold-down anchor (230). The peripheral card header (100) is for mounting on a surface (110) and has application in portable electronic devices, such as electronic organizers. The hold-down anchor (230) has a lead-in feature (430) to allow a peripheral card (310) to be inserted without snagging or otherwise jamming before the complete insertion of the card.