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    DIVERSITY DEVICE IMPROVED IN ABILITY TO REPRODUCE CARRIER IN SYNCHRONOUS DETECTION
    2.
    发明申请
    DIVERSITY DEVICE IMPROVED IN ABILITY TO REPRODUCE CARRIER IN SYNCHRONOUS DETECTION 审中-公开
    改进了能够在同步检测中再现载体的多样性设备

    公开(公告)号：WO1997019536A1

    公开(公告)日：1997-05-29

    申请号：PCT/JP1996003432

    申请日：1996-11-21

    Applicant: SANYO ELECTRIC CO., LTD. ,  IINUMA, Toshinori

    Inventor： SANYO ELECTRIC CO., LTD.

    IPC: H04L01/02

    CPC classification number: H04L1/06 ,  H04B7/0865 ,  H04L27/2271

    Abstract: A diversity device is provided with detecting sections which output received phase data on each symbol by using a reference carrier reproduced from the signals received by means of a plurality of receiving systems, synthesizing sections which synthesize the I- and Q-components of the received phase data, and a judging section which demodulates digital symbol data from the synthesized I- and Q-components. The detection sections reproduce the reference carrier from the received signals by referring to the symbol data obtained from the synthesized I- and Q-components. Thus, a stable carrier can be reproduced, because the reference carrier is reproduced by using demodulated data obtained from diversity-synthesized received data.

    Abstract translation: 分集装置设置有检测部分，其通过使用从通过多个接收系统接收的信号再现的参考载波来输出每个符号上的接收相位数据，合成部分，其合成接收相位的I和Q分量 数据和从合成的I和Q分量解调数字符号数据的判断部分。 检测部分通过参考从合成的I和Q分量获得的符号数据，从接收到的信号中再现参考载波。 因此，由于通过使用从分集合成的接收数据获得的解调数据再现参考载波，所以可以再现稳定的载波。

    TIME DIVERSITY COMMUNICATION SYSTEM
    3.
    发明申请
    TIME DIVERSITY COMMUNICATION SYSTEM 审中-公开
    时间多样性通信系统

    公开(公告)号：WO1995024786A1

    公开(公告)日：1995-09-14

    申请号：PCT/JP1995000395

    申请日：1995-03-10

    Applicant: NTT MOBILE COMMUNICATIONS NETWORK INC. ,  ITO, Shogo ,  YAMAO, Yasushi ,  OHKUBO, Shinzo

    Inventor： NTT MOBILE COMMUNICATIONS NETWORK INC.

    IPC: H04L01/02

    CPC classification number: H04L1/0065 ,  H04B7/02 ,  H04L1/0061 ,  H04L1/02 ,  H04L1/08 ,  Y02D70/442

    Abstract: The reception rate of a radio selective call receiver is improved by a time diversity system. Time diversity reception is applied to both the address signal and message signal constituting a call signal. Namely, the time diversity reception is executed for every error correcting or detecting code word which is the unit constituting the address and message signals irrespective of whether the signal is the address or message signal. For example, out of the code words having the same contents received several times, code words which are judged to be properly decoded in accordance with the error detection decoding logic are selected, and thus receiving signals composed of properly decoded code words can be obtained. Alternatively, a code word having the minimum possibility of error correction can be selected out of the corrected code words having the same contents received several times, by selecting the code word having the smallest number of error-corrected bits from among the code words which are judged to be properly decoded in accordance with the error correcting decoding logic. Thus, the reception rate of the radio selective call receiver is improved. When a code word is properly decoded, in addition, part of the radio selective call receiver is made in operative by inhibiting the reception of the code words having the same contents transmitted thereafter. As a result, the battery consumption of the receiver is reduced.

    Abstract translation: 无线电选呼接收机的接收速率由时间分集系统改善。 时间分集接收被应用于构成呼叫信号的地址信号和消息信号。 即，无论该信号是地址还是信息信号，对于构成地址的单元和消息信号的每个纠错或检测码字都执行时间分集接收。 例如，在具有多次接收的相同内容的码字中，选择根据错误检测解码逻辑被判断为正确解码的码字，从而可以获得由适当解码的码字组成的接收信号。 或者，通过从代码字中选择具有最小数目的纠错位的代码字，可以从经过多次接收的相同内容的校正代码字中选出具有最小误差可能性的代码字， 判断为根据纠错解码逻辑正确解码。 因此，提高了无线电选呼接收机的接收速率。 当代码字被正确地解码时，另外通过禁止对其后发送的相同内容的代码字的接收，使无线电选呼接收机的一部分成为可操作的。 结果，接收机的电池消耗减少了。

    HIGH FREQUENCY COMMUNICATIONS
    5.
    发明申请
    HIGH FREQUENCY COMMUNICATIONS 审中-公开
    高频通信

    公开(公告)号：WO1982002633A1

    公开(公告)日：1982-08-05

    申请号：PCT/GB1982000025

    申请日：1982-01-27

    Applicant: UNITED KINGDOM GOVERNMENT ,  WILKINSON ROBERT GRAHAM

    Inventor： UNITED KINGDOM GOVERNMENT

    IPC: H04L01/02

    CPC classification number: H04L1/20 ,  H04L1/0083 ,  H04L1/02 ,  H04L27/30

    Abstract: A slow speed hf communications modem employs frequency and time diversity to overcome transmission problems due to noise, multipath etc. A digitally encoded signal is transmitted consecutively on five complementary 2-tone channels distributed within the hf band. A unique start-of-message (SOM) signal is generated (9) to precede a message transmission and an end-of-message signal (EOM) follows the message. The SOM signal is detected (18) to produce an accurate timing pulse (20) which initiates a clock in the receiver modem 3 arranged to sample each channel tone at times appropriate to receiving message signals. The noise in each channel tone is also sampled before (pre-data bit) and after (post-data bit) a signal data bit and the measured pre- and post-data bits are combined to assign a weighting factor to the associated message data bits. By providing SOM and EOM signals the modem is able to operate unattended.

    Abstract translation: 慢速通信调制解调器采用频率和时间分集来克服由于噪声，多径等引起的传输问题。数字编码的信号在分布在hf频带内的五个互补的2音频信道上连续传输。 在消息传输之前生成唯一的消息（SOM）信号（9），消息结束信息（EOM）跟随消息。 检测到SOM信号（18）以产生精确的定时脉冲（20），该定时脉冲在接收调制解调器3中启动时钟，接收器调制解调器3设置成在适于接收消息信号的时间采样每个信道音调。 每个通道色调中的噪声也在（预数据位）之前和之后（后数据位）一个信号数据位进行采样，并且测量的数据前和后数据位被组合以向相关联的消息数据分配加权因子 位。 通过提供SOM和EOM信号，调制解调器能够无人值守地操作。

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