Abstract: To provide an amplifying device with reduced size, weight and cost. The amplifying device delays input signals using digital delay sections in a main signal system, performs offset rotation processing of digital input signals in carrier offset sections and power detection in a power detecting section in a control system, matches phases of a multi-carrier signal of the main signal system and a power value signal of the control system in a phase control section, and gives distortion compensation in a predistorter for canceling a nonlinear characteristic generated in an amplifier.

Abstract: A peak limiter for use in a system for amplifying a multi-carrier signal receives a baseband signal of each carrier of the multi-carrier signal. The multi-carrier signal is computationally estimated to have carriers combined in an RF band, and obtains power information of the multi-carrier signal to limit an amplitude of the baseband signal based on the power information of the estimated multi-carrier signal to thereby provide peak-limited baseband signals. Thus, the distortion generated by performing the unnecessary peak limitation can be effectively prevented to thereby improve the reliability of the entire system.

Abstract: A telecommunications device is provided that enables monitoring of the directivity of a wireless communications system that wirelessly transmits signals using multiple communications antennas while controlling the overall directivity of the multiple antennas.

Abstract: A communication device for transmitting and/or receiving signals using a communication antenna includes signal characteristic information detection means for detecting information regarding signal characteristics of a calibration signal contained in a signal received by the communication antenna, calibration means for calibrating a communication antenna chain based on the detected signal characteristic information, cancellation signal generating means for generating a cancellation signal corresponding to a calibration signal contained in the signal received by the communication antenna based on the calibration signal, signal cancellation-by-subtraction means for subtracting the generated cancellation signal from the signal received by the communication antenna; and receive signal processing means for processing the received signal diminished by the cancellation signal.

Abstract: A distortion compensation apparatus for compensating for the distortion occurring in an amplifier with high precision is provided. Distortion generating devices generate a distortion of amplitude or phase on a signal to be provided for an amplifier. A signal level detecting device detects a level of the signal provided for the amplifier, and a distortion amount control system controls the amount of distortion generated by the distortion generating devices on the basis of the level detected by the signal level detecting device, and at this time, a control timing adjusting system adjusts the timing for controlling the distortion amount by a distortion amount control system (D/A converters) so that the distortion occurring in the amplifier maybe compensated sufficiently.

Abstract: A receiver that uses multiple antennas to receive signals arriving over multiple paths and is configured for enhanced received signal path detection accuracy and improved reception quality includes receive weight generating means that generates receive weights for every antenna based on signals received from the antennas, summing means that calculates sums of results obtained by multiplying the signals from the antennas and the receive weights of the individual antennas generated by the receive weight generating means, and path detection means that detects the paths of the received signals based on the sums calculated by the summing means.

Abstract: A distortion compensation apparatus for compensating for the distortion occurring in an amplifier with high precision is provided. Distortion generating devices generate a distortion of amplitude or phase on a signal to be provided for an amplifier. A signal level detecting device detects a level of the signal provided for the amplifier, and a distortion amount control system controls the amount of distortion generated by the distortion generating devices on the basis of the level detected by the signal level detecting device, and at this time, a control timing adjusting system adjusts the timing for controlling the distortion amount by a distortion amount control system (D/A converters) so that the distortion occurring in the amplifier maybe compensated sufficiently.

Abstract: There is disclosed a despreading circuit which can reduce a circuit scale and power consumption. In the despreading circuit of the present invention, A/D converter converts a CDMA modulated analog signal to a digital signal of N bits, a searcher detects a synchronization phase from high-order small bits of the N bits and outputs synchronization phase information to a control circuit, the control circuit transmits a signal for allowing despreading to be performed to a sliding correlator based on the phase information, and the sliding correlator despreads the N bit digital signal outputted by the A/D converter and transmits the resulting correlation output as a demodulated signal to the outside.

Abstract: A distortion compensation apparatus for compensating the distortion occurring in the amplifier at high precision is provided. Distortion generating means (2), (3) generate distortion of amplitude or phase on the signal to be provided for an amplifier (4), signal level detecting means (5) detects the level of the signal provided for the amplifier (4), and distortion amount control means (12), (7), (8) control the amount of distortion generated by the distortion generating means (2), (3) on the basis of the level detected by the signal level detecting means (5), and at this time, control timing adjusting means (9), (19), (11) adjust the timing for controlling the distortion amount by distortion amount control means (D/A converters (7), (8) in the illustrated embodiments) so that the distortion occurring in the amplifier (4) may be compensated sufficiently.

Abstract: A cell search determination circuit is provided which is capable of reducing misdetections in the identification of a scramble code number. A mobile station in W-CDMA cellular communications confirms a scramble code identified by cell search.

Abstract: The present invention intends to provide a receiver which receives a signal by switching a plurality of communication systems, wherein a circuit scale is reduced to intend to the miniaturization of a device. The receiver converts a received signal to a base band signal by a local oscillation frequency based on the selected communication system by a mixer, limits a band by an LPF through which signals of all communication systems can pass, performs a band limitation based on the communication system by weighting with a tap coefficient based on the selected communication system to synthesis by a transversal filter, and demodulates a signal by a demodulation system based on the selected communication system by a demodulating unit.

Abstract: A despreading circuit which can reduce a circuit scale and power consumption is described. The circuit includes an A/D converter which converts a CDMA modulated analog signal to a digital signal of N bits, and a searcher which detects a synchronization phase from high-order small bits of the N bits and outputs synchronization phase information to a control circuit. The control circuit transmits a signal for allowing despreading to be performed to a sliding correlator based on the phase information. The sliding correlator despreads the N bit digital signal outputted by the A/D converter and outputs the resulting correlation output as a despreading signal.

Abstract: A multi-user demodulator eliminates synchronization problems without interference cancellation. A threshold process is applied to a despread signal to extract each user's signal. The extracted signals are respread, and those respread signals other than a specifier user's signal are subtracted from the received signal to ideally extract the specific user's signal.