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    METHOD AND APPARATUS FOR SIGNAL RECEPTION, AND MEDIUM
    3.
    发明公开
    METHOD AND APPARATUS FOR SIGNAL RECEPTION, AND MEDIUM 有权
    方法和装置接收和MEDIUM

    公开(公告)号：EP0998068A4

    公开(公告)日：2003-05-07

    申请号：EP99907836

    申请日：1999-02-19

    Applicant: SONY CORP

    Inventor： IKEDA YASUNARI ,  OKADA TAKAHIRO

    IPC: H04L27/00 ,  H04J11/00 ,  H04L25/02 ,  H04L25/03 ,  H04L27/26

    CPC classification number: H04L5/0048 ,  H04L5/0007 ,  H04L25/022 ,  H04L25/0232 ,  H04L25/03159 ,  H04L27/2647 ,  H04L2025/03414 ,  H04L2025/03522

    Abstract: The intermediate frequency signals of OFDM signals received by a tuner (2) are multiplied by the carrier wave by multipliers (3 and 4) to generate OFDM signals of the base band. An FFT circuit (5) processes the OFDH signals of the base band and then supplies them to a pilot signal extraction circuit (8) and a division circuit (10) in an equalizer circuit (13). The pilot signals extracted by the pilot signal extraction circuit (8) are supplied to an interpolation filter (9). The amplitude and phase components of the interpolated pilot signals are supplied to the division circuit (10). The division circuit (l0) divides the signals input from the FFT circuit (5) by the amplitude and the phase received from the interpolation filter (9) and supplies the resulting signals to a demapping circuit (11). An FFT window circuit (6) detects the length of the guard interval from the outputs of the multipliers (3 and 4) and supplies it to a control circuit (21). In response to the received guard interval, the control circuit (21) controls the bandwidth of the interpolation filter (9) to restrict the deterioration of the equalization characteristic due to noise.

    OFDM (ORTHOGONALE FREQUENZMULTIPLEXIERUNG)-EMPFÄNGER
    6.
    发明专利
    OFDM (ORTHOGONALE FREQUENZMULTIPLEXIERUNG)-EMPFÄNGER 未知

    公开(公告)号：DE69924804D1

    公开(公告)日：2005-05-25

    申请号：DE69924804

    申请日：1999-02-19

    Applicant: SONY CORP

    Inventor： IKEDA YASUNARI ,  OKADA TAKAHIRO

    IPC: H04L27/00 ,  H04J11/00 ,  H04L25/02 ,  H04L25/03 ,  H04L27/26

    Abstract: An intermediate frequency signal of an OFDM signal received by a tuner (2) is multiplied by a carrier wave by a multiplier (3) and a multiplier (4) to thereby generate an OFDM signal in a base band. The OFDM signal in the base band is FFT processed by an FFT circuit (5) and a resultant signal is outputted to a dividing circuit (10) and a pilot signal extracting circuit (8) in an equalizing circuit (13). A pilot signal extracted by the pilot signal extracting circuit (8) is supplied to an interpolating filter (9) and subjected to an interpolating process. An amplitude component and a phase component in the pilot signal are supplied to the dividing circuit (10). The dividing circuit (10) divides the signal input from the FFT circuit (5) by the amplitude and phase supplied from the interpolating filter (9) and a resultant signal is output to a demapping circuit (11). An FFT window circuit (6) detects the length of the guard interval from outputs of the multipliers (3) and (4) and outputs the detection signal to a control circuit (21). The control circuit (21) controls the band width of the interpolating filter (9) in accordance with the length of the input guard interval, thereby suppressing deterioration in the equalizing characteristics by noises.

    Method and apparatus for radio reception.
    7.
    发明专利
    Method and apparatus for radio reception. 未知

    公开(公告)号：HK1047834A1

    公开(公告)日：2003-03-07

    申请号：HK02107798

    申请日：2002-10-28

    Applicant: SONY CORP

    Inventor： IKEDA YASUNARI ,  OKANOBU TAIWA

    IPC: H04B1/26 ,  H04J11/00 ,  H04L27/26 ,  H04J

    Abstract: An interference signal from an adjacent signal is prevented and a desired signal demodulated. A frequency conversion circuit 4 converts a received signal frequency to a first intermediate frequency signal of a first intermediate frequency higher than the frequency of the signal to be demodulated by 57 MHz. The first intermediate frequency signal is further converted to a second intermediate frequency signal of a second intermediate frequency by a frequency conversion circuit 8 . The second intermediate frequency is a frequency lower than the 57 MHz of the first intermediate frequency by exactly a frequency ½ of an FFT sampling f-clock. A clock generation circuit 11 generates a signal of a frequency two times the FFT sampling clock, that is, four times the second intermediate frequency. The second intermediate frequency is sampled by the A/D conversion circuit 10 based on the signal supplied from the clock generation circuit 11 , demodulated by a demodulation circuit 12 , and subjected to an FFT operation by an FFT circuit 13 , whereby the signal is demodulated.

    Method and apparatus for radio reception, and medium
    9.
    发明专利
    Method and apparatus for radio reception, and medium 未知

    公开(公告)号：AU3195100A

    公开(公告)日：2000-10-04

    申请号：AU3195100

    申请日：2000-03-17

    Applicant: SONY CORP

    Inventor： IKEDA YASUNARI ,  OKANOBU TAIWA

    IPC: H04B1/26 ,  H04J11/00 ,  H04L27/26

    Abstract: An interference signal from an adjacent signal is prevented and a desired signal demodulated. A frequency conversion circuit 4 converts a received signal frequency to a first intermediate frequency signal of a first intermediate frequency higher than the frequency of the signal to be demodulated by 57 MHz. The first intermediate frequency signal is further converted to a second intermediate frequency signal of a second intermediate frequency by a frequency conversion circuit 8 . The second intermediate frequency is a frequency lower than the 57 MHz of the first intermediate frequency by exactly a frequency ½ of an FFT sampling f-clock. A clock generation circuit 11 generates a signal of a frequency two times the FFT sampling clock, that is, four times the second intermediate frequency. The second intermediate frequency is sampled by the A/D conversion circuit 10 based on the signal supplied from the clock generation circuit 11 , demodulated by a demodulation circuit 12 , and subjected to an FFT operation by an FFT circuit 13 , whereby the signal is demodulated.

    Transmitting device and method, and providing medium
    10.
    发明专利
    Transmitting device and method, and providing medium 未知

    公开(公告)号：AU2830100A

    公开(公告)日：2000-09-21

    申请号：AU2830100

    申请日：2000-03-06

    Applicant: SONY CORP

    Inventor： OKADA TAKAHIRO ,  IKEDA YASUNARI

    IPC: H04J11/00 ,  H04B1/04 ,  H04J20060101 ,  H04L5/06

    Abstract: A transmission apparatus which prevents adversely affects from an adjacent channel even without provision of a guard band. An information sequence 1 input to a mapping unit 21 - 1 of the transmission apparatus is mapped onto predetermined signal points by QAM modulation, etc. and output to a frequency converter 22 - 1 . The frequency converter 22 - 1 converts the frequency according to a center frequency of an input signal and outputs the result to a multiplexer 23 . The other data series are processed in the same way as the data series 1 are output to the multiplexer 23 . The multiplexer 23 multiplexes a plurality of input signals, while an IFFT processor 24 performs an inverse Fourier transform on the multiplexed signals all at once. The inverse Fourier transformed signal is quadrature-modulated by a quadrature modulator 26 , converted to the RF band signal by the frequency converter 28 , and transmitted from an antenna 30.

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