Abstract: power supply module comprises a voltage converter coupled to first and second inputs. The voltage converter comprises a boosting circuit configured to boost an input voltage and comprises an input voltage selector (IVS) selectively connect and disconnect the first and second inputs to the boosting circuit. A first sensing circuit is coupled to the first input and comprises a pair of inputs coupled to the first input, a rectifier assembly, a resistor bank coupled between the pair of inputs and the rectifier assembly, a sense resistor coupled to the rectifier assembly, and a voltage sensor coupled to the sense resistor. A DC converter is configured to generate and supply an auxiliary voltage to the first sensing circuit. The resistor bank filters an electromagnetic interference (EMI) signal transmitted from the DC converter to a value below a threshold value.

Abstract: Simulation devices for simulating communication lines are provided. In some embodiments, different parameters are used along a line length.

Abstract: A personal audio device, such as a wireless telephone, includes an adaptive noise canceling (ANC) circuit that adaptively generates an anti-noise signal from a reference microphone signal and injects the anti-noise signal into the speaker or other transducer output to cause cancellation of ambient audio sounds. An error microphone is also provided proximate to the speaker to provide an error signal indicative of the effectiveness of the noise cancellation. A secondary path estimating adaptive filter is used to estimate the electro-acoustical path from the noise canceling circuit through the transducer so that source audio can be removed from the error signal. A level of the source audio with respect to the ambient audio is determined to determine whether the system may generate erroneous anti-noise and/or become unstable.

Abstract: A wireless network allocates uplink resources to wireless communication devices (WCDs) based on power headroom reports, with more resources being allocated to WCDs reporting greater power headrooms. Each WCD may determine a respective power headroom as a difference between its maximum transmit power and a transmit power requirement for its current uplink resource allocation. However, a WCD may report an adjusted power headroom that is obtained, for example, by decreasing its respective power headroom by an adjustment value. The WCD may then receive an uplink resource allocation that is based on the adjusted power headroom that it reported. The adjustment value could be based on a priority level of the WCD, a priority level of data to be transmitted by the WCD, and/or an instruction from the wireless network. In one example, basic-priority WCDs report adjusted power headrooms so that more uplink resources are available for high-priority WCDs.

Abstract: A terminal random access procedure is improved by allowing a mobile terminal to correctly map signature indexes onto cyclic shifted Zadoff-Chu (ZC) sequences when the deployed cells support a high-speed mobility by informing a mobile terminal whether a cell supports high-speed mobility.

Abstract: Systems and methods can provide for preventing a false alarm generated during a planned network outage during a maintenance window. Security systems can generate and report alarms to a security center through a communications network. Intruders are known to disable the communication network thereby preventing reporting of an alarm to the security center. Security systems can generate local alarms upon detecting loss of the communications network. It is advantageous for a communications network operator to prevent false alarm generation during periods of planned network outages.

Abstract: A receiver may train its equalizer using consecutive pilot bursts, divide the traffic between the consecutive pilot bursts into multiple sub-segments, and interpolate the trained equalizer coefficients to obtain the coefficients for equalizing one or more of the sub-segments. The receiver may also determine signal to interference and noise ratio (SINR) values based on each of the consecutive pilot bursts, and interpolate the SINR for decoding one or more of the sub-segments. The receiver may be an access terminal receiver operating in a code division multiple access (CDMA) cellular system.

Abstract: A system and method for establishing a high speed, substantially constant circuit based data connection over a conventional telephone line is provided. The circuit based connection is non-switched, thereby eliminating the need to establish a connection through a dial-up process. The circuit based connection is established between a user's terminal device and a digitizer, such as a basic rate interface transmission exchange card. The user's terminal device may be a modified version of a conventional integrated services digital connection modem. A user's computer, telephone, or other device may be connected to the user's terminal device to access an external network. The connection established in accordance with the present invention can transmit data at a rate far exceeding that of traditional dial-up connections.

Abstract: An OFDM (Orthogonal Frequency Division Multiplexing) system may utilize pilot symbol structures including two or more pilot symbols with pilot information on alternate tones. The pilot information in one symbol is transmitted on mirror tones in another of the symbols. The pilot symbol structure may include a copy of one of the pilot symbols to aid in frequency offset estimation.

Abstract: Disclosed are systems and methods which provide for processing of calls by determining when a called number is associated with telephone having a portable interface and providing call processing adapted for addressing issues associated with a portable interface. Call processing may provide for point of demand processing of calls to facilitate completion of calls in real-time, even when such calls are directed to a wireless telephone, a telephone for which LNP has been utilized, or other telephone having a portable interface. If an appropriate relationship has not been already been established for facilitating a call to a telephone having a portable interface, embodiments operate to establish such a relationship. When it is determined that a called number is associated with telephone having a portable interface, embodiments operate to invoke rating schemes appropriate to the called number, possibly including flat rate schemes and rating determined using current location determination.

Abstract: A method is provided for controlling the transmitting power in a mobile radio system a corresponding mobile radio system is also provided. A signal emitted from a transmitter is received by a receiver via a transmission channel of the mobile radio system. The transmitted signal is evaluated and a power control information item is generated based on the result of the evaluation. The power control information item is then transmitted back to the transmitter for adjusting the transmitting power. In order to determine the power control information item, the time response of the transmission channel is estimated and the transmitting power needed in the future is deduced therefrom.

Abstract: Systems and methods are described for digital subscriber loop repeaters. A method of transforming a digital subscriber loop signals includes increasing a gain with a digital subscriber loop repeater including: isolating an upstream signal band by passing an upstream signal through an upstream pass filter; amplifying the isolated upstream signal with an upstream amplifier; isolating a downstream signal band by passing a downstream signal through a downstream pass filter; and amplifying the isolated downstream signal with a downstream amplifier. The systems and methods provide advantages because DSL can be provided over long loops and/or over coil loaded loops.

Abstract: A method and telecommunication system for tracking the carrier phase of a received signal includes the addition of a pilot signal to the data component of the signal prior to modulation and transmission. The pilot signal is specified to have a frequency equal to the inverse of twice a data symbol interval with zero crossings positioned at the midpoint of each symbol interval to avoid interference with the data. The received signal is demodulated to produce a complex data signal from which the pilot signal is detected to provide an estimate of the phase error in the complex data signal. The elimination of the phase error from the complex data signal is accomplished through a corrective phase shift that is equal and opposite to the estimated phase error. A sample timing estimate may also be obtained in a similar manner.

Abstract: A control system and method suppress noise in a power-line-based system which has a device repeater connected to an electrical device, and which may be capable of remote control by signals transmitted through the power-line-based system. The control system includes a control device and a communications bus. The communications bus connects the control device to the device repeater. The control device, using a control repeater, controls a phase signal of the device repeater to suppress noise during operation of the electrical device associated with the device repeater.

Abstract: An improved, more intelligent network interface unit capable of processing signals received from a high speed transmission media and outputting the received signals without substantial amplification or reduction. The network interface unit comprises a regenerator circuit which detects T1 signals from said high-speed transmission media and outputs a digital stream to a serial data processor for processing via a micro-controller. A wave shaper circuit receives the output from the serial data processor and, in conjunction with the micro-controller and a level detector circuit, regenerates signals having substantially the same wave shape and amplitude as the original T1 signals received from said transmission media.

Abstract: A terrestrial flight telephone system comprises a number of air stations which communicate on a common frequency with a ground station. The ground station can handle calls from a number of air stations in respective slots of sequential frames defined by the ground station. Accurate synchronisation is critical to the functioning of the system and drift in an oscillator of the air station, which controls the timing of transmissions from the air station, is corrected by signals received from the ground station.

Abstract: In a communications system containing signal enhancement circuitry capable of selectively enhancing portions of a plurality of signals carried on a corresponding plurality of channels through the signal enhancement circuitry, a system and method for controlling enhancement on a per call basis. The system includes: (1) command generation circuitry for generating an enhancement command for transmission to the signal enhancement circuitry and (2) command reception circuitry, associated with the signal enhancement circuitry, for receiving the enhancement command from the command generation circuitry and selectively enhancing the portion of the signals on the per call basis according to the enhancement command.

Abstract: A communications station (10) couples a bidirectional input-output signal path (16') to two unidirectional signal paths; a transmit signal path (12') and a receive signal path (14'), using a controllable hybrid (20). A feedback control system in the station minimizes the amount of transmit signal appearing at the receive output port (24) of the hybrid (20). The control system spreads the spectrum of a pilot signal (40) by means of a biphase modulator (46) and a pseudorandom generator (42) to produce a spread-spectrum pilot, which is added, in a summer 30, to the transmit signal. The spread-spectrum pilot signal covers the bandwidth of the information signal, and is reflected in an amount and with a phase which depends upon the relative impedance presented to the hybrid (20) by the bidirectional signal path (16').

Abstract: Methods and apparatus are disclosed for improving the clarity and intelligibility of incoming speech in a telephone connection. Improved sound quality is provided by automatically selecting, or enabling the selection of, an appropriate sound enhancement for a particular individual at a given telephone number. Sound enhancements applied to calls originating from or terminating at a given telephone station are determined on a call-by-call basis. The sound enhancement set at the beginning of a telephone call can be changed mid-call to a different sound enhancement. Thus, different occupants of a household may select their own sound enhancement, or may select no enhancement at all.

Abstract: An autoequalizing hybrid circuit for providing a cancelation path to minimize the two-wire receive path signals that are reflected onto a two-wire transmit path from a subscriber line interface circuit is disclosed. The hybrid circuit includes a variable impedance balance network. A tone generator injects a set of equalization signals into the receive path which are used to control the setting, or equalization, of the balance network. The tone generator also generates a supervisory signal into the receive path used to monitor the performance of the balance network. A detect circuit monitors the level of the reflected equalization sidetone signals and produces balance signals whenever the equalization signals fall to a null level. The detect circuit also monitors the supervisory sidetone signals and produces a recalibration signal whenever an abrupt change in the signals indicates that the balance network is no longer adequately cancelling their reflected signals.

Abstract: A facility for establishing a signaling link over a telecommunications network connection formed by a number of network switches is provided so that an upstream switch may communicate with a downstream switch in the connection. The facility is particularly useful in controlling the number of times that signals traveling over the connection are subjected to a particular function.

Abstract: A radio relay method for digital communication using a heterodyne relay system consisting of terminal stations and relay stations each having radio repeaters using radio frequency of microwave or millimeter wave. The radio repeater usually receives a desired signal as a correct signal for a route to which the terminal and relay stations belong, however, the radio repeater can receive an undesired signal, whose level is beyond the threshold level of a squelch circuit in the radio repeater, produced by interference with an radio signal from an adjacent different route for example. When the desired signal decays due to fading for example and the undesired wave becomes dominant, the terminal station of the route must distinguish which relay station has a trouble.