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Inventor:
Hiramatsu; Katsuhiko
Address:
Yokohama, JP
No. of patents:
21
Patents:












Patent Number Title Of Patent Date Issued
6519278 Transmitting/receiving apparatus using a plurality of spreading codes February 11, 2003
Transmitting/receiving apparatuses are installed in a base station and a mobile station, respectively, to perform mutual transmission and reception by using a plurality of spreading codes. The transmitting/receiving apparatus installed in the base station has a block for designating to t
6456677 Synchronization equipment September 24, 2002
The synchronizing apparatus includes a block for detecting a code from an input signal, a block for detecting from the code the variable points of the code at several times as high as the symbol rate, a block for calculating a histogram of the detected variables of the code to time, and
6289064 Synchronization equipment September 11, 2001
A synchronization equipment performs correlation processing between a first known pattern included in a received signal and a second known pattern, and detects reception timing of the received signal. A correlation value computing portion computes a correlation value between the first kn
6266363 Transmitting/receiving apparatus using a plurality of spreading codes July 24, 2001
Transmitting/receiving apparatuses are installed in a base station and a mobile station, respectively, to perform mutual transmission and reception by using a plurality of spreading codes. The transmitting/receiving apparatus installed in the base station has a block for designating to t
6236672 Transmitting/receiving apparatus using a plurality of spreading codes May 22, 2001
Transmitting/receiving apparatuses are installed in a base station and a mobile station, respectively, to perform mutual transmission and reception by using a plurality of spreading codes. The transmitting/receiving apparatus installed in the base station has a block for designating to t
6212407 Spread-spectrum transmitter and receiver providing suppressed interference between high-speed an April 3, 2001
A transmitter is provided in a base station which communicates with a mobile station of a high-speed communication user and a mobile station of a low-speed communication user according to a spread spectrum system. The transmitter includes a first antenna having a wide directivity, a seco
6208701 Synchronizing apparatus March 27, 2001
The synchronizing apparatus includes a block for detecting a code from an input signal, a block for detecting from the code the variable points of the code at several times as high as the symbol rate, a block for calculating a histogram of the detected variables of the code to time, and
6195402 Pattern matching apparatus February 27, 2001
In a multi-value modulation system such as M bits/1 symbol, a pattern matching apparatus is arranged by a coincident bit number detecting circuit for detecting a coincident bit number between a reception symbol and the known pattern owned by a receiver within 1 symbol; a delay circuit
6118987 Radio transmitting apparatus and gain control method for the same based on complex weight coeffi September 12, 2000
Gain control is performed on an input signal to an orthogonal modulator used in a radio transmitting apparatus in such a manner that the level of the input signal falls within the proper operation range of the orthogonal modulator. At the time of amplifying and outputting the output of t
6111921 Estimator of error rate August 29, 2000
An estimator of error rate is provided for reducing variations of an error pulse count value at burst signals of a received signal for digital mobile communications and thereby improving an accuracy of estimating an error rate. The estimator of error rate includes detectors for detecting
6075827 DQPSK mapping circuit June 13, 2000
A DQPSK mapping circuit is disclosed which comprises: a parallel decoding circuit having inputs for decoding first to 2Nth bits of input data and one symbol period prior I and Q data which are prior by one symbol period from the present decoding cycle thereof through the inputs and outpu
6069924 Differential detector with error correcting function May 30, 2000
A differential detector imparted with error correcting function for detecting a differentially phase shifted signal while performing error correction includes a one-symbol differential detector for performing phase comparison between a current input signal and a signal preceding by o
6009131 Synchronizer December 28, 1999
A detection circuit of a synchronizer detects a difference between a reference timing of a transmitter and a reference timing of a receiver based on a time of receiving a known transmission pattern sent from the transmitter. An average value calculation circuit calculates an average
5991281 ATM radio transmission apparatus November 23, 1999
An ATM radio transmission apparatus includes an ATM unit having a normal operation mode and a low power consumption mode, a CPU for determining a transmission request based on information of a radio section, and a control line for switching an operation mode of the ATM unit from the CPU.
5966664 Communication control method for requesting priority data October 12, 1999
When a second mobile machine requests the communication of priority data with a base station while a first mobile machine conducts the communication of non-priority data with the base station, the base station transmits wait information to the first mobile machine by using a down lin
5907303 CMA-based antenna system May 25, 1999
A CMA-based antenna system is disclosed which shows an improved receiving performance by reducing phase differences in the received signals which have been weighted. The CMA-based antenna system comprises a plurality of antenna, weight circuits, an adder, an error detector and a synthesi
5841400 Estimator of direction of desired signal November 24, 1998
A desired signal is received at first and second antennas. Output signals of the first and second antennas are orthogonal-detected by first and second signal conversion circuits and thereby converted into first and second baseband signals. A complex conjugation circuit generates a comple
5802121 Synchronization device for digital communications September 1, 1998
A synchronization device includes a first section for generating a predetermined signal. A second section is operative for detecting a correlation between a received signal and the predetermined signal generated by the first section for every sample interval. A third section is opera
5727035 Synchronization device for digital communications March 10, 1998
A synchronization device has a first section for generating a predetermined signal. A second section is operative for detecting a correlation between a received signal and the predetermined signal generated by the first section. A third section is operative for generating a predetermined
5625650 Synchronous adder device April 29, 1997
A synchronous adder device comprising an A/D converter for digitizing a receive signal transmitted through a plurality of subcarriers by sampling it and an adding unit for determining the value of synchronous addition for each sample is provided with synthetic waveform shaping filters fo
5574450 Synchronization adder circuit November 12, 1996
A synchronization adder circuit for digital data communication includes an A/D converter, a waveform-shaping circuit, a square circuit, a low-pass filter, and an adder. The A/D converter samples at given sampling points in time per sampling cycle a received signal transmitted through a










 
 
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