Abstract: A method and system are presented in which communication redundancy is provided. Multicast packets having the same audio and/or control data are simultaneously transmitted between an RF site and different switches through different communication links. The packets from the RF site have different origination addresses and a unique ID, which permits duplicate packets having different origination addresses but the same unique ID and data to be eliminated and only one set of packets to be transmitted over the air to a receiving end device for which the packets are intended. A switch communication link between the switches permits the primary switch to establish operating characteristics for the alternate switch.

Abstract: A power amplifier module and corresponding system for linearizing the output from a power amplifier includes both a feedback system, containing a compensator and the power amplifier in a feedback loop, and a pre-distortion compensation system injecting pre-distortion signals into or before the feedback system are used to compensate for non-linearities in the overall system. The pre-distortion signals may be mixed with signals from the compensator or may be filtered to take into account the loop compensator transfer function of the feedback loop, mixed with baseband signals and then converted into analog signals that are provided to the feedback loop. In modules containing a tracking power supply, an envelope calculator calculates an RF envelope of the baseband signals, which the pre-distortion system uses in conjunction with the baseband signals to generate the pre-distortion signals mixed with the signals from the compensator.

Abstract: A communication device contains multiple microphones that receive acoustic signals from a user and from the background. The acoustic signals from the user are enhanced using the background acoustic signals to reduce background noise. The enhanced signal are transmitted to an emergency network when an emergency call is made from the communication device. The raw signals are stored in the communication device for later retrieval or are transmitted simultaneously with the enhanced signals. The enhanced signals are transmitted using a circuit-switched voice mode while the raw signals are transmitted using a packet-switched voice mode.

Abstract: Methods and systems are described in which the feedback between a transmitter and collocated receiver is reduced so that the overall feedback loop gain is less than 0 dB. Audio is transmitted from the transmitter to the receiver through a primary RF link while RSSI or TOA information to determine the separation between the end devices is exchanged using an ancillary RF link. The total loop gain is calculated using the gain of each end device and the separation. If the distance is less than a threshold distance, the gain of one or more components in the transmitter and/or receiver is reduced.

Abstract: A wireless communication system and portable radio repeater are described. The system includes a portable magazine having multiple portable radio repeaters disposed therein. One or more of the repeaters are automatically or manually ejected based on a received signal strength measurement. Once ejected, each repeater communicates from the ejected location, automatically switching between passive and active receive modes based on received signal strength. The repeater has a sensor to transmit environmental data or a visual or audible locator. The magazine has a dispensing mechanism with a mechanical or electro-mechanical release mechanism that holds the repeater to be ejected in a substantially fixed position. The dispensing mechanism detects when the repeater switches to the active mode and dispenses the repeater in response thereto, as well as detecting the number repeaters remaining within the magazine and communicating this information.

Abstract: A method for synchronizing media reproduction across heterogeneous networks is presented. The networks include end-to-end IP broadband and narrowband simulcast networks that contain broadband and narrowband devices associated with a common communications group. A controller in the networks determines delay times for reproduction of a media stream across devices in the networks and establishes the longest delay time. The longest delay time is used to calculate appropriate transmission and reproduction timestamps to permit the devices to reproduce the provided media stream in synchronization. Narrowband base stations repeat the media stream at the time specified by a transmission timestamp, and broadband end devices reproduce the media stream at the time specified by a reproduction timestamp. By synchronizing the presentation time, the devices present the media at substantially the same time and are granted fair rights to communicate with one another.

Abstract: Latch circuit and clock signal dividing circuit comprises sequentially connected latch circuits. Each latch circuit has D-type latch with latch clock input, data input and data output. A difference detector is coupled to D-type latch, and has a difference output that provides a difference signal when data at input is different than data at output. Each latch circuit has an edge triggered gate that has gate clock input, output coupled to latch clock input and gate control input coupled to difference output of difference detector. In operation, when both a transition of clock signal supplied at gate clock input is detected by edge triggered gate, and the difference signal is provided to gate control input, will edge triggered gate allow an edge of a clock signal supplied at gate clock input to determine logic values supplied to latch clock input. As a result, data at input is transferred to output.

Abstract: A hybrid power control system (102) that selectively applies voltage-based gain control and current-based gain control and method (300) of controlling a power amplifier (104) gain are presented. A voltage-based gain control signal (120) is applied to control the gain of the power amplifier when a level output power is indicated by a power contour signal (132). Whether the power amplifier is saturated is identified. A current-based gain control signal (122) is applied to control the gain of the power amplifier when the power amplifier is saturated and a decrease in output power is indicated by the power contour signal.

Abstract: A wireless broadband communications system that provides increased reliability in environments in which portions of the available operating frequency band are subject to interference. The system determines whether the operating frequency band is being subjected to interference. If so, then the system determines whether such interference is affecting one or more portions of the band. If interference is affecting just portions of the band, then the system reduces the data rate and the number of sub-carriers used to transmit data. Next, the system allocates the data to be transmitted to the sub-carriers currently being subjected to the lowest levels of interference, while allocating no data to the sub-carriers currently being subjected to the highest levels of interference. In this way, the system allocates the data to be transmitted to the sub-carriers occupying optimal portions of the operating frequency band, in response to detected changes in the interference environment.

Abstract: A battery charger and method for communicating battery pack charging status information of a battery pack coupled to both the battery charger and an electronic device such as a radio is presented. An authenticity battery pack identifier and battery status information provided by the battery pack to the battery charger is read. The authenticity battery pack identifier and charging status information is transmitted over a wireless link from the battery charger to the radio. The charging status information is then processed by the radio when the authenticity battery pack identifier matches a currently coupled battery pack identifier stored on the radio. The currently coupled battery pack identifier identifies the battery pack that is coupled to the radio.

Abstract: An apparatus and method for adjusting transmission phasing in a point-to-point communication link is disclosed. The relative phases of the transmissions from each antenna are adjusted before transmission to give optimum gain when received by two or more antenna elements and a signal combining element. The signal includes a data component, consisting of a subset of the subcarriers modulated with the input data, which is common to transmissions from all antenna elements; and a phase reference component consisting of a subset of the subcarriers that are modulated with a predetermined phase. The signal combining element is operable to receive the components and extract phase information.

Abstract: An apparatus and method are provided for reducing the output voltage in a power amplifier. The power amplifier contains a power supply, an amplifier stage, an impedance matching circuit, and a voltage reduction unit connected between the power supply and the amplifier stage. A power amplifier device within the amplifier stage has a gain bandwidth that covers multiple frequency bands. The output voltage of the power amplifier device is a composite voltage that contains fundamental and harmonic components that lie within the gain bandwidth. The voltage reduction unit reduces the supply voltage of the power amplifier device such that the composite output voltage is less than the breakdown voltage in the power amplifier device. The impedance matching circuit is coupled to the power amplifier device output and provides impedance matching for output signals of the fundamental and harmonic frequencies.

Abstract: A circuit board connector assembly mounted in a housing and method of mounting are described. The assembly has orthogonal first and second circuit boards (CB). The CB has a CB connector containing a CB housing with CB electrical contacts. A flexible electrical link has a link connector mounted in a link connector housing with link electrical contacts. A resilient pad is mounted on a link connector housing and a flexible sheet is mounted to both the pad and the link. The sheet spans a length of the link. When the length of the link is substantially planar, the sheet provides a ramp tapering away from the pad. During mounting of the assembly in the housing, the CB connector is operatively coupled to the link connector thereby forming a first connector assembly, and an abutment edge of the second circuit board slidably engages the sheet thereby compressing the pad.

Abstract: A system and method for conveying supervisory signaling and power over the same twisted wire pairs in a cable as are used to carry data communications in accordance with a predetermined communications protocol. Supervisory signals having first and second differential components are generated. The first component is coupled to both wires of one of the twisted wire pairs as a common mode signal and the second component of the supervisory signal is coupled to both wires of another twisted pair as a common mode signal. The first and second components are recovered at the remote end of the cable. Physical interfaces are AC coupled to the respective twisted pairs at both ends of the cable and positive and negative voltage rails powered by a power sourcing device are coupled to predetermined twisted pairs to convey a DC voltage over the cable which may be used to power a remote electronic device.

Abstract: A method and apparatus of controlling battery charging of an RF power amplifier are disclosed. The RF power amplifier is supplied by the battery when charging is progressing normally, but switches supply to the charger if the charging process is interrupted. A thermal detector detects a threshold temperature in the battery. A power controller provides feedback to a charger. The charger output is regulated in response to the battery feedback and the charging is suspended when the battery temperature exceeds the threshold temperature. After the charging is suspended, the charger output is regulated to maintain a minimum output voltage. Using a signal from logic circuitry, if charging has been suspended a first switching means disconnects the negative terminal of battery from ground and a second switching means connects the RF power amplifier to the charger.