| Patent Number |
Title Of Patent |
Date Issued |
| 7327996 |
High sensitivity radio receiver |
February 5, 2008 |
| The invention relates to a high sensitivity receiver installed outdoors which may be used in a base station of a mobile communication system, for example. A received radio frequency signal is converted into a signal in a desired frequency band by a reception bandpass filter RXF3, is subj |
| 7227906 |
Radio communication method and apparatus for multiplex transmission of plural signals in the sam |
June 5, 2007 |
| Different carrier frequencies are chosen for plural transmitters of a transmitting device and signals are transmitted at frequency bands overlapping each other. In the receiving device weighting coefficients are provided in input-to-output paths of an interchannel interference cancel |
| 7203469 |
Supergain array antenna system and method for controlling supergain array antenna |
April 10, 2007 |
| To provide a super directional gain in a multi-element array antenna. An array antenna comprising a plurality of antenna elements A-1 A-4 spaced at intervals (equal to or less than a quarter of a wavelength) that provides a supergain is used. A weight generator circuit generates weight |
| 7186377 |
Absorption power measuring device |
March 6, 2007 |
| In an apparatus for measuring absorbed power including an electromagnetic field probe 1 fixedly mounted within a head simulation phantom 2 which simulates the configuration and the electromagnetic characteristics of a head of a human body, and wherein the strength of an electric field or |
| 7072409 |
Space multiplex radio communication method and radio communication apparatus |
July 4, 2006 |
| A radio communication system is comprised of: a transmitting system in which N transmission signals, frequency-converted to the same transmission frequency, are generated by N transmitters, N being an integer equal to or greater than 2, and the transmission signals are each applied t |
| 7013087 |
Communication system using optical fibers |
March 14, 2006 |
| A divider/combiner unit combines RF signals, then converts the combined signal into an optical signal and sends it over an optical fiber. N radio access units each convert the optical signal received from the optical fiber into an RF signal and transmits it from an antenna, and each radi |
| 6963758 |
High-sensitivity wireless receiving device and high-frequency unit used therefor |
November 8, 2005 |
| In a high sensitive radio receiver system for a diversity reception from two antennae per each of three sectors (SC1, SC3, SC3), a series connection of a bandpass filter (3.sub.1 to 3.sub.6) and a low noise amplifier (4.sub.1 to 4.sub.6) is contained in each of a plurality of vacuum |
| 6907269 |
Mobile communication base station equipment |
June 14, 2005 |
| A mobile communication base station determines the oncoming direction of a radio wave with a simple arrangement and transmits a narrow angle beam in this direction. Received signals from a pair of wide angle beam antennae 21-1 and 21-2 having an equal configuration and a common orientati |
| 6838934 |
Feedforward amplifier with dual loop |
January 4, 2005 |
| In a feedforward amplifier with a dual loop in which a distortion injection path of a distortion elimination circuit 50 is provided as a feedforward configuration composed of a first auxiliary amplifier distortion elimination circuit 60 and a first auxiliary amplifier distortion elim |
| 6621367 |
Signal power dynamic range compressing circuit and power amplifier using the same |
September 16, 2003 |
| In an input signal power dynamic range compressing circuit, an input signal is distributed by a directional coupler to a linear signal transfer path and a compressing signal generating path, and in the compressing signal generating path a compressing signal, which keeps the peak-to-a |
| 6515544 |
Multi-terminal power combining feed-forward amplifier |
February 4, 2003 |
| A feed-forward amplifier configuration 40.sub.n having a distortion detector circuit and a distortion canceller circuit is formed between an input port Ip.sub.n and an output port OP.sub.n of a multi-terminal power-combining power amplifier with a main amplifier 4M provided for each |
| 6480706 |
High sensitivity radio receiver |
November 12, 2002 |
| A receiver directs the center of the main beam of the antenna directivity response in a desired direction by passing signals received by n antenna elements 1a to 1d through a phase shifter 3. An output from the phase shifter 3 is passed through a receiving filter 5 and is then amplified |
| 6392483 |
Feed-forward amplifier |
May 21, 2002 |
| In a feed-forward amplifier a signal power dynamic range compressing circuit for compressing the power dynamic range of the input signal to the feed-forward amplifier is provided in a distortion detecting loop at the input side of a main amplifier, and the output backoff of the main |
| 6320464 |
Feedforward amplifier |
November 20, 2001 |
| In a distortion injection path (15) wherein a detected distortion component of a main amplifier (23) becomes amplified, distortion by an auxiliary amplifier (29a) is detected by an auxiliary distortion detector (42) composed of a variable attenuator (27a), a variable phase shifter (28a), |
| 6208204 |
Feedforward amplifier |
March 27, 2001 |
| In the balance adjustment using a pilot signal in a distortion detector and a distortion canceller of a feed-forward amplifier for amplifying a CDMA transmission signal, a pilot code is spread by a long code different from that of the CDMA transmission signal to obtain the pilot signal. |
| 6178158 |
Method and apparatus for transmission and reception |
January 23, 2001 |
| In a method for transmission and reception over N transmission channels, the transmitting side performs orthonormal transform processing of N-channel modulated signals so that the resulting transformed output signals have lower cross-correlation, and the transformed N-channel signals |
| 5907585 |
Digital signal detecting method and detector |
May 25, 1999 |
| An automatically gain-controlled analog received signal is AD converted to a digital signal, which is subjected to quadrature demodulation processing through operation. The quadrature demodulation result is subjected to low-pass filter processing through operation, that is, a digital det |
| 5812296 |
Fiber optics transmission system |
September 22, 1998 |
| In a fiber optics transmission system in which a plurality of access units are cascade-connected via up-link and down-link optical fiber lines and connected to a base unit, the base unit has a beat noise detector and a noise information generator and, upon detection of beat noise, noise |
| 5796307 |
Amplifying device having input and output nonlinear phase shifters of opposite phase-frequency c |
August 18, 1998 |
| An input signal is applied to a first phase shifter whose phase shift amount-vs.frequency characteristic is a square-law characteristic, then the output from the first phase shifter is amplified by an amplifier, and the amplified output is applied to a second phase shifter which has a |
| 5790555 |
Signal multiplexer and multiplexing method |
August 4, 1998 |
| The frequencies of input modulated signals fed via ports 11.sub.1 to 11.sub.n are converted by frequency converting parts 12.sub.1 to 12.sub.n to different bands, and the converted outputs are applied to power combining part 24 decides if 16 via variable attenuators 21.sub.1 to 21.su |
| 5715525 |
Radio frequency circuit for portable radion communication device |
February 3, 1998 |
| Band-pass filters BPF1, BPF2, and BPF3 correspond to the reception frequency band for FDD, the transmission band for FDD, and the band for TDD, respectively. An antenna A1 is used in common for transmission and reception in the FDD and TDD systems. Another antenna A2 is used for dive |
| 5412342 |
Power amplifier device comprising a plurality of feedforward distortion compensating circuits in |
May 2, 1995 |
| For supply to first and second feedforward distortion compensating circuits 33(1), 33(2) connected in parallel, a two-divider 31 divides into signals of a common phase and a common amplitude an input or composite radio frequency signal supplied to an input terminal 11. The composite radi |
| 5394120 |
Device for testing an amplifier |
February 28, 1995 |
| A device for testing an amplifier. A plurality of PN modulators are provided corresponding to a plurality of oscillators at stages preceding or following them, or fluctuation is given to division ratios at the oscillators. Since each of n carriers combined by a combiner contains phas |
| 5363072 |
High-frequency power divider-combiner |
November 8, 1994 |
| In a power amplifying apparatus which has a high-frequency power divider and combiner and two to four parallel-operated power amplifiers, in which a change is made in the number of the parallel-operated power amplifiers so as to adjust output power, there are provided a power dividing ci |
| 5327096 |
Control circuit for automatically controlled feed forward nonlinear distortion compensation ampl |
July 5, 1994 |
| A control circuit for an automatically controlled feed forward nonlinear distortion compensation amplifier. The control circuit controls a distortion detection loop and a distortion removal loop. The distortion detection loop is a loop for feeding forward input to a main amplifier in |
| 5313657 |
Receiver capable of reliably detecting a failure |
May 17, 1994 |
| In a receiver comprising a receiver filter (12) with a frequency attenuation band and a pilot oscillator (25) for generating a pilot oscillation signal with a pilot frequency in the frequency attenuation band, a coupler (26) couples the pilot oscillation signal and a filtered receive |
| 5302908 |
High precision phase comparator and phase locked loop |
April 12, 1994 |
| A modulus counter counts first clock pulses to modulus M and outputs the count value as an m-bit reference signal, M being an integer. A latch circuit samples and holds the reference signal in response to a trigger signal generated by a trigger signal generator in synchronism with an |
| 5251330 |
Linear transmitter |
October 5, 1993 |
| This invention relates to a linear transmitter which controls the bias voltage of either the drain electrode or collector electrode of an amplifier for radio frequency based on the envelope of the modulated signal, and is characterized in that it controls the bias voltage of the radi |
| 5231632 |
Radio communication equipment for a mobile station and traffic channel hand-off method using the |
July 27, 1993 |
| In radio communication equipment for use in a mobile station, provision is made for selectively applying either one of the oscillation outputs of first and second local oscillators to a transmitting part and a receiving part by first and second RF switches, respectively. In a traffic cha |
| 5166634 |
Feed-forward amplifier |
November 24, 1992 |
| In a feed-forward amplifier which has an error detection circuit for detecting a nonlinear distortion component of a main amplifier and an error rejection circuit for amplifying the detected distortion component by an auxiliary amplifier and injecting it into the main amplifier to ca |
| 5146178 |
Impedance-matched, class F high-frequency amplifier |
September 8, 1992 |
| An impedance matched class-F high frequency amplifier includes an input matching circuit receiving high frequency signals connected to the gate of the FET. The drain of the FET is connected to an output matching circuit which matches the fundamental frequency and the second harmonic freq |
| 4980652 |
Frequency synthesizer having compensation for nonlinearities |
December 25, 1990 |
| In a phase locked loop frequency synthesizer, the frequency of a VCO is switched by changing the division ratio of a variable ratio frequency divider in the feedback path of the loop. At the time of switching, a prepositioning voltage is applied to the VCO to realize fast frequency s |
| 4943783 |
Feed forward distortion correction circuit |
July 24, 1990 |
| In a feed forward type distortion correction circuit which detects a nonlinear distortion component of a main amplifier, amplifies the distortion component by an auxiliary amplifier and injects the amplified distortion component into the main amplifier output to cancel the distortion |
| 4902983 |
Nonlinear signal generating circuit and nonlinear compensating device using the same |
February 20, 1990 |
| A device for compensating for nonlinearity of amplifiers by use of a predistortion principle, and a nonlinear signal generating circuit built in such a device. The nonlinear signal generating circuit includes a quadrature hybrid of the type using a distributed constant line. Two diod |
| 4776032 |
Repeater for a same frequency with spillover measurement |
October 4, 1988 |
| The system for measuring the spillover signal from a transmitter to a receiver in a same frequency repeater or a booster has a frequency conversion device which slightly offsets the transmission frequency from the reception frequency, and a signal detector which measures the offset f |
| 4772856 |
Power amplifier |
September 20, 1988 |
| An input signal is divided equally by a divider and the equally divided outputs are applied to first and second amplifying means, respectively. A filter means, which rejects the fundamental wave component of the input signal but passes therethrough its harmonic component, is connected |
| 4329655 |
Adaptive equalization system for nonlinearities |
May 11, 1982 |
| An adaptive equalization system for compensating the nonlinearities generated in a traveling-wave tube amplifier comprises an equalization circuit connected to the traveling-wave tube amplifier. The equalization circuit has a series circuit having a distortion generator for providing a |
