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    Nonlinear precoding method for a digital broadcast channel
    5.
    发明申请
    Nonlinear precoding method for a digital broadcast channel 有权
    数字广播频道的非线性预编码方法

    公开(公告)号：US20060198459A1

    公开(公告)日：2006-09-07

    申请号：US10564832

    申请日：2004-07-07

    申请人： Robert Fischer ,  Christoph Windpassinger

    发明人： Robert Fischer ,  Christoph Windpassinger

    IPC分类号： H04L1/02

    CPC分类号： H04L25/4975 ,  H04L1/0618 ,  H04L25/03343 ,  H04L2025/0342

    摘要： Several subscriber signals are transmitted simultaneously and at the same frequency by a central transmitter to several decentralized receivers which do not cooperate with each other, by digital message transmission in a broadcast channel. A common transmission signal, which enables an error-free individual reception, should be generated with knowledge of all subscriber signals and of the current transmission conditions, by signal preprocessing methods on the transmission side. Known nonlinear precoding methods totally suppress the interference signals, so that the channel diversity cannot be used. In the claimed precoding method, the occurring interference signals are, on the contrary, taken into account. On the basis of a modulo arithmetic calculation, the transmission channel is not totally equalized, but virtually divided, so that the transmission of the subscriber signals is continued periodically; the signals are selected according to the minimal transmission power and pre-equalized, in a linear manner, and the residual interferences, still remaining between the subscriber signals, may assume special values from a preset set of values. The set of values is selected, so that the interference signals of the other subscribers are also merely reflected in the otherwise already existing periodic continuation and can be suppressed or used as required by a modulo decision, on the reception side.

    摘要翻译： 通过广播频道中的数字消息传输，多个用户信号由中央发射机同时传输，并以相同的频率被传输到不彼此协作的若干分散式接收机。 通过发送侧的信号预处理方法，可以利用所有用户信号和当前传输条件的知识来生成能够实现无错误的单独接收的公共传输信号。 已知的非线性预编码方法完全抑制干扰信号，使得不能使用信道分集。 在所要求的预编码方法中，相反地考虑了所发生的干扰信号。 在模运算的基础上，传输信道并不完全相等，而是虚拟分割，使得用户信号的传输周期性地继续; 根据最小传输功率选择信号并以线性方式进行预均衡，并且仍然保留在用户信号之间的残留干扰可以从预设的一组值采取特殊值。 选择这组值，使得其他用户的干扰信号也仅仅反映在另外已经存在的周期性继续中，并且可以在接收侧根据模决定的要求被抑制或使用。

    Remote-control access control device and method for operating the same
    8.
    发明授权
    Remote-control access control device and method for operating the same 失效
    遥控门禁控制装置及其操作方法

    公开(公告)号：US5552641A

    公开(公告)日：1996-09-03

    申请号：US300480

    申请日：1994-09-02

    申请人： Robert Fischer ,  Johannes Ilg ,  Christian Schneider ,  Ulrich Schrey

    发明人： Robert Fischer ,  Johannes Ilg ,  Christian Schneider ,  Ulrich Schrey

    IPC分类号： B60R25/04 ,  B60R25/40 ,  E05B85/00 ,  G07C9/00 ,  B60R25/00

    CPC分类号： G06K19/0712 ,  B60R25/04 ,  B60R25/406 ,  G06K19/0707 ,  G07C9/00309 ,  E05B85/01 ,  G07C2009/00357 ,  G07C2009/00484 ,  G07C2009/00587 ,  G07C2009/00793

    摘要： A remote-control access control device, particularly for motor vehicles, includes a stationary transmitter and receiver unit responding to actuation of tripping means for transmitting a question code signal, receiving an answer code signal, and furnishing an unlocking signal to an unlocking unit if the answer code signal matches a command code signal. A portable transponder has a receiver receiving the question code signal and a transmitter transmitting the answer code signal. The question code signal is repeatedly transmitted if no answer code signal has been received in response to an initial transmission, and a signal parameter is modified upon transmission of the answer code signal as a function of a field intensity of the question code signal or of a battery voltage of the transponder. Alternatively, a signal parameter is modified when the answer code signal is transmitted if an information content of the question code signal indicates an emergency operation state. As another alternative, the transmitter and receiver unit has both a transmission channel for receiving signals of low field intensity and a transmission channel for receiving signals of high field intensity. A method is also provided for operating the access control device.

    摘要翻译： 远程控制访问控制设备，特别是用于机动车辆的远程控制访问控制设备包括：固定发射器和接收器单元，其响应于用于发送问号码信号的跳闸装置的动作，接收应答码信号，以及如果解锁单元提供解锁信号 应答码信号匹配命令码信号。 便携式应答器具有接收问题码信号的接收器和发送应答码信号的发射机。 如果没有接收到响应于初始传输的应答码信号，则重复发送问题码信号，并且在作为问题码信号的场强度的函数的应答码信号发送时对信号参数进行修改， 应答器的电池电压。 或者，如果问题码信号的信息内容指示紧急操作状态，则当应答码信号被发送时，修改信号参数。 作为另一替代方案，发射机和接收机单元具有用于接收低场强信号的传输信道和用于接收高场强信号的传输信道。 还提供了一种用于操作访问控制装置的方法。