Patents by Inventor Haruhiro Shiino

Haruhiro Shiino has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20100229054
    Abstract: A wireless communication apparatus performs data communication with a base station using a plurality of transport channels (TRCHs) that share a frequency band, and selects a reference TRCH using coding schemes of data to be transmitted using the TRCHs. After that, the wireless communication apparatus performs outer loop control so that a block error rate (BLER) of the data to be transmitted using the reference TRCH is set to a target BLER.
    Type: Application
    Filed: March 5, 2010
    Publication date: September 9, 2010
    Applicant: FUJITSU LIMITED
    Inventors: Yoshifumi Uchiyama, Haruhiro Shiino
  • Patent number: 6452936
    Abstract: A spread-spectrum communication apparatus transmits and receives packets of data preceded by reference signals used in demodulating the packets of data. A control unit in the communication apparatus estimates channel conditions, and varies the length of the transmitted packets, hence the intervals between reference signals, using longer packets under better channel conditions. Configuration information indicating the packet length may also be transmitted. Excessive overhead can thus be avoided without impairing the accuracy of channel estimates used in demodulating the received data.
    Type: Grant
    Filed: October 13, 1998
    Date of Patent: September 17, 2002
    Assignee: Oki Electric Industry Co., Ltd.
    Inventor: Haruhiro Shiino
  • Patent number: 6163566
    Abstract: A spread spectrum communications system is provided for reducing the number of required matched filters to simplify the configuration associated with the reception. In a spread spectrum transmitter, a plurality of spread channel signals are synthesized by shifting their respective phases by a time sufficiently shorter than one symbol period. In a spread spectrum receiver, a plurality of spread code sequences are set one by one at a tap of a single matched filter in one symbol period in a time division manner to recover transmitted data.
    Type: Grant
    Filed: October 2, 1998
    Date of Patent: December 19, 2000
    Assignee: Oki Electric Industry Co., Inc.
    Inventor: Haruhiro Shiino
  • Patent number: 6021161
    Abstract: An adaptive equalizer increases the estimation accuracy of a channel, and prevents the modulation characteristics from degrading. A sampling circuit generates a sampled sequence from a received signal. The sampled sequence is supplied from a buffer to an equalizing circuit, a channel estimating circuit and a delay amount estimating circuit. The equalizing circuit obtains an estimated transmitted symbol sequence from the sampled sequence and an estimated impulse response sequence. The channel estimating circuit obtains the estimated impulse response sequence from the sampled sequence, estimated transmitted symbol sequence and the estimated error. The delay amount estimating circuit supplies an estimated delay amount to a step-size control circuit. An error extracting circuit obtains the estimated error.
    Type: Grant
    Filed: April 25, 1997
    Date of Patent: February 1, 2000
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Norio Yamaguchi, Haruhiro Shiino
  • Patent number: 5946607
    Abstract: An analog input signal is fed to an amplifier having a gain level that is determined by a gain control signal, and the amplified input signal is then converted into a digital received signal. A direct-current offset is detected from the digital received signal. The gain control signal is generated based in part on the direct-current offset.
    Type: Grant
    Filed: March 28, 1997
    Date of Patent: August 31, 1999
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Haruhiro Shiino, Norio Yamaguchi, Toshimichi Naoi
  • Patent number: 5867531
    Abstract: When a maximum likelihood sequence estimator according to the present invention is used as an equalizer or the like for a receiver, a Viterbi algorithm processing portion 331 in the maximum likelihood sequence estimator estimates a transmission symbol Ea.sub.n with a reception signal y.sub.n and an estimated impulse response {Eh.sub.k } corresponding to Viterbi algorithm so as to estimate a maximum likelihood sequence corresponding to a soft decision regardless of a modulating method. A transmission logic code decoder 34 converts a transmission symbol Ea.sub.n into hard decision data Eb.sub.m with a value "1" or "0". An envelope detector 333 that is a transmission line quality evaluating means detects an envelope level p.sub.n of the reception signal y.sub.n. A soft decision value converting portion 334 converts the envelope level p.sub.
    Type: Grant
    Filed: February 22, 1996
    Date of Patent: February 2, 1999
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Haruhiro Shiino, Norio Yamaguchi, Toshimichi Naoi
  • Patent number: 5761211
    Abstract: A timing recovery circuit samples an input signal, correlates the resulting sample stream with a reference pattern at different timings, then compares the resulting correlation values with each other and with a threshold, and estimates a timing at which a peak correlation can be obtained. The peak correlation timing is estimated with a precision exceeding the precision given by the sampling period. The estimated timing can be used by a receiving circuit for bit synchronization, symbol synchronization, or frame synchronization, or to adjust the sampling timing.
    Type: Grant
    Filed: July 30, 1996
    Date of Patent: June 2, 1998
    Assignee: OKI Electric Industry Co., Ltd.
    Inventors: Norio Yamaguchi, Haruhiro Shiino, Ryoichi Miyamoto
  • Patent number: 5751776
    Abstract: A receiver to be employed in a digital mobile communication system, more particularly to a receiver for performing complex correlation against a received signal so as to establish and supervise the synchronization with the received signal. The receiver estimates a transmission channel between sending and receiving stations using the received signal and a predetermined reference signal (S11). The phase of the received signal is compensated for using the estimated phase error resulting from the estimation (S12). Complex correlation of the received signal which is compensated for in phase is performed against the reference signal (S13) to obtain a correlation value. The correlation value is compared with a predetermined threshold value (S14). The presence or absence of synchronization between the sending and receiving stations can be detected based on the result of the comparison.
    Type: Grant
    Filed: October 25, 1996
    Date of Patent: May 12, 1998
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Haruhiro Shiino, Norio Yamaguchi, Toshimichi Naoi
  • Patent number: 5680421
    Abstract: A frame synchronization apparatus is applied to the TDMA (Time Division Multiple Access) communication system, particularly, where a plurality of transmission rates are available. The frame synchronization apparatus calculates correlations between sampled sequences of a received signal and an assigned sync sequence during the longest or shortest frame period in the plurality of transmission rates. The apparatus stores positions where the correlations exceed a given threshold. Then, the apparatus sets a search gate at a position after a lapse of the longest or shortest frame period from each of those positions. The apparatus calculates correlations between the sync sequence and sampled sequences of the received signal for all the search gates. The actual transmission rate is determined from the plurality of transmission rates based on a time interval of positions where the correlations beyond a second threshold were detected. Synchronization is thus established.
    Type: Grant
    Filed: February 22, 1996
    Date of Patent: October 21, 1997
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Haruhiro Shiino, Norio Yamaguchi, Toshimichi Naoi, Ryoichi Miyamoto
  • Patent number: 5602881
    Abstract: A receiver to be employed in a digital mobile communication system, more particularly to a receiver for performing complex correlation against a received signal so as to establish and supervise the synchronization with the received signal. The receiver estimates a transmission channel between sending and receiving stations using the received signal and a predetermined reference signal (S11). The phase of the received signal is compensated for using the estimated phase error resulting from the estimation (S12). Complex correlation of the received signal which is compensated for in phase is performed against the reference signal (S13) to obtain a correlation value. The correlation value is compared with a predetermined threshold value (S14). The presence or absence of the synchronization between the sending and receiving stations can be detected, based on the result of the comparison.
    Type: Grant
    Filed: December 21, 1993
    Date of Patent: February 11, 1997
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Haruhiro Shiino, Norio Yamaguchi, Toshimichi Naoi
  • Patent number: 5533066
    Abstract: A sampling phase calculating part calculates a complex cross-correlation function; of a part corresponding to a training sequence of an equalizer of each sequence with respect to individual sample value sequences i of a reception signal y(t) which are sampled in a plurality of different sampling phases and selects a sampling phase where the absolute value of the complex cross-correlation functions is maximized, then selects a sampling phase .tau.s where the bit error rate is minimized according to a calculation based on the above selected sampling phase. A sampling processing part samples the reception signals y(t) in the sampling phase .tau.s for use in obtaining estimated values E of a transmission symbol sequence in a Viterbi algorithm processing part (130) and a transmission line estimating part (140), thereby to obtain a transmission symbol sequence with an improved bit error rate and higher accuracy.
    Type: Grant
    Filed: February 2, 1994
    Date of Patent: July 2, 1996
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Norio Yamaguchi, Haruhiro Shiino
  • Patent number: 5479419
    Abstract: An adaptive maximum likelihood sequence estimator includes a channel estimator and a Viterbi algorithm processor for estimating the maximum likelihood transmission symbol sequences. The algorithm processor includes a branch metric computer in which common components are found from regularity in computations of coded alphabets of the transmission symbols and are used for all branch metric computation to reduce the total amount of the operations. Such effective computations are implemented by either of hardware and software in accordance with the constitution of the system of the adaptive maximum likelihood sequence estimator.
    Type: Grant
    Filed: June 28, 1994
    Date of Patent: December 26, 1995
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Toshimichi Naoi, Haruhiro Shiino, Yasuo Shoji
  • Patent number: 5303263
    Abstract: An equalizer including a channel estimator allowing a Viterbi algorithm processor to estimate transmitted symbols accurately, so that the impulse response of a transmission channel may not deviate from the correct one. The equalizer outputs an transmitted symbol sequence estimate having the largest path metric by correcting the channel impulse response by parameter coefficients of the LMS (Least Mean Square) or RLS (Recursive Least Square) algorithm, by compensating for phase fluctuations due to the frequency offset and phase jitter of received signals, or by using a sequence included in an intermediate portion of a TDMA (Time Division Multiple Access) frame format.
    Type: Grant
    Filed: June 24, 1992
    Date of Patent: April 12, 1994
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Yasuo Shoji, Haruhiro Shiino, Norio Yamaguchi, Masami Abe
  • Patent number: 4961160
    Abstract: An LPC analyser calculates LPC coefficients using signals bandlimited to half the sampling frequency of the LPC coefficients to be calculated. Thef calculated LPC coefficients are continuous in time scale and free from aliasing distortion. A bandlimiting circuit suitable for use in the LPC analyser is also disclosed.
    Type: Grant
    Filed: April 27, 1988
    Date of Patent: October 2, 1990
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Shinichi Sato, Atsushi Fukasawa, Takuro Sato, Yasuo Shoji, Haruhiro Shiino, Yukio Suzuki, Hiromi Ando