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    COMMUNICATION SYSTEM
    11.
    发明专利
    COMMUNICATION SYSTEM 未知

    公开(公告)号：CA2652875A1

    公开(公告)日：1994-09-26

    申请号：CA2652875

    申请日：1994-03-25

    Applicant: PANASONIC CORP

    Inventor： OSHIMA MITSUAKI

    IPC: H04N5/455 ,  H04B1/68 ,  H04L1/00 ,  H04L1/22 ,  H04L5/00 ,  H04L27/00 ,  H04L27/02 ,  H04L27/04 ,  H04L27/18 ,  H04L27/26 ,  H04L27/34 ,  H04L27/38 ,  H04N5/44 ,  H04N7/015 ,  H04N7/24 ,  H04N7/26 ,  H04N19/89

    Abstract: At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and second, data streams. The signal points are divided into signal point groups to which data of the first data stream are assigned. Also, data of the second data stream are assigned to the signal points of each signal point group. A difference in the transmission error rate between first and second data streams is developed by shifting the signal points to other positions in the space diagram expressed at least in the polar coordinate system. At the receiver side, the first and/or second data streams can be reconstructed from a received signal. In TV broadcast service, a TV signal is divided by a transmitter into, low and high, frequency band components which are designated as a first and a second data streams respectively. Upon receiving the TV signal, a receiver can reproduce only the low frequency band component or both the low and high frequency band components, depending on its capability. Furthermore, a communication system based on an OFDM system is utilized for data transmission of a plurality of subchannels, wherein the subchannels are differentiated by changing the length of a guardtime slot or a carrier wave interval of a symbol transmission time slot, or changing the transmission electric power of the carrier.

    COMMUNICATION SYSTEM
    12.
    发明专利
    COMMUNICATION SYSTEM 未知

    公开(公告)号：CA2652602A1

    公开(公告)日：1994-09-26

    申请号：CA2652602

    申请日：1994-03-25

    Applicant: PANASONIC CORP

    Inventor： OSHIMA MITSUAKI

    IPC: H04B1/68 ,  H04L1/00 ,  H04L1/22 ,  H04L5/00 ,  H04L27/02 ,  H04L27/04 ,  H04L27/18 ,  H04L27/26 ,  H04L27/34 ,  H04L27/38 ,  H04N5/44 ,  H04N7/015 ,  H04N7/24 ,  H04N7/26 ,  H04N19/89

    Abstract: At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and second, data streams. The signal points are divided into signal point groups to which data of the first data stream are assigned. Also, data of the second data stream are assigned to the signal points of each signal point group. A difference in the transmission error rate between first and second data streams is developed by shifting the signal points to other positions in the space diagram expressed at least in the polar coordinate system. At the receiver side, the first and/or second data streams can be reconstructed from a received signal. In TV broadcast service, a TV signal is divided by a transmitter into, low and high, frequency band components which are designated as a first and a second data streams respectively. Upon receiving the TV signal, a receiver can reproduce only the low frequency band component or both the low and high frequency band components, depending on its capability. Furthermore, a communication system based on an OFDM system is utilized for data transmission of a plurality of subchannels, wherein the subchannels are differentiated by changing the length of a guardtime slot or a carrier wave interval of a symbol transmission time slot, or changing the transmission electric power of the carrier.

    COMMUNICATION SYSTEM
    20.
    发明专利
    COMMUNICATION SYSTEM 未知

    公开(公告)号：CA2652876C

    公开(公告)日：2009-09-15

    申请号：CA2652876

    申请日：1994-03-25

    Applicant: PANASONIC CORP

    Inventor： OSHIMA MITSUAKI

    IPC: H04L27/00 ,  H04B1/68 ,  H04J11/00 ,  H04L1/00 ,  H04L1/22 ,  H04L5/00 ,  H04L27/02 ,  H04L27/04 ,  H04L27/18 ,  H04L27/26 ,  H04L27/34 ,  H04L27/38 ,  H04N5/44 ,  H04N7/015 ,  H04N7/24 ,  H04N7/26 ,  H04N19/89

    Abstract: At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and second, data streams The signal points are divided into signal point groups to which data of the first data stream are assigned. Also, data of the second data stream are assigned to the signal points of each signal point group. A difference in the transmission error rate between first and second data streams is developed by shifting the signal points to other positions in the space diagram expressed at least in the polar coordinate system. At the receiver side, the first and/or second data streams can be reconstructed from a received signal. In TV broadcast service, a TV signal is divided by a transmitter into, low and high, frequency band components which are designated as a first and a second data streams respectively. Upon receiving the TV signal, a receiver can reproduce only the low frequency band component or both the low and high frequency band components, depending on its capability. Furthermore, a communication system based on an OFDM system is utilized for data transmission of a plurality of subchannels, wherein the subchannels are differentiated by changing the length of a guard time slot or a carrier wave interval of a symbol transmission time slot, or changing the transmission electric power of the carrier.

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