公开(公告)号：US4435823A

公开(公告)日：1984-03-06

申请号：US221020

申请日：1980-12-29

申请人： Robert C. Davis ,  Gautam H. Thaker

发明人： Robert C. Davis ,  Gautam H. Thaker

IPC分类号： H04L25/03 ,  H04B3/18

CPC分类号： H04L25/03038 ,  H04L25/03057

摘要： Equalizers are commonly used in digital data signaling systems to reduce the effects of intersymbol interference on a signal received over a transmission channel. However, conventional equalizers are relatively slow due to their use of multipliers. Also, generally such equalizers are limited to providing a linear response to the received input signal samples. Accordingly, to provide a high-speed equalizer which is capable of both linear and nonlinear response, a transmission channel signal containing intersymbol interference is passed through a delay means which provides sequential Q-bit samples of said transmission channel signal. These Q-bit samples are then applied to a weighting means which includes a memory having stored equalizing weighting values which are accessed in accordance with the Q-bit samples to provide predetermined weighted output words in response to the Q-bit samples. These output words can be either linear or nonlinear with respect to the Q-bit samples. This technique serves to reduce intersymbol interference in the received signal thereby equalizing this signal. Also, since no multipliers are necessary, the equalizing operation can be carried out at a very high speed.

摘要翻译： 均衡器通常用于数字数据信号系统，以减少符号间干扰对通过传输信道接收的信号的影响。 然而，由于使用乘法器，常规均衡器相对较慢。 此外，通常这种均衡器被限制为对接收到的输入信号样本提供线性响应。 因此，为了提供能够进行线性和非线性响应的高速均衡器，包含符号间干扰的传输信道信号通过提供所述传输信道信号的连续Q比特采样的延迟装置。 然后将这些Q位采样应用于加权装置，该加权装置包括具有存储的均衡加权值的存储器，其根据Q位采样进行访问，以响应于Q位采样来提供预定的加权输出字。 这些输出字可以是相对于Q位样本的线性或非线性。 该技术用于减少接收信号中的符号间干扰，从而均衡该信号。 此外，由于不需要乘法器，所以均衡操作可以以非常高的速度进行。

公开(公告)号：US4707832A

公开(公告)日：1987-11-17

申请号：US721645

申请日：1985-04-10

申请人： Raymond R. Glenn ,  Andrew T. Powshok ,  Robert S. Padgett ,  Pedro Uriarte ,  Joseph B. Cain ,  Gautam H. Thaker

发明人： Raymond R. Glenn ,  Andrew T. Powshok ,  Robert S. Padgett ,  Pedro Uriarte ,  Joseph B. Cain ,  Gautam H. Thaker

IPC分类号： H04L12/28 ,  H04J1/00 ,  H04J3/12

CPC分类号： H04L12/2801

摘要： A local area network employs a shared control channel over which control messages between frequency agile modems for each of the user nodes of a distributed architecture-configured network are exchanged. In addition to the shared control channel, a plurality of data channel pairs is available for effecting full duplex communications between any two nodes of the network. Because all data channel assignments depend upon successful use of the control channel, a prescribed control channel contention access scheme is employed to optimize use of the control channel by all users of the network irrespective of the demand for its use. Pursuant to this scheme, each requesting node must first compare an accumulated activity measure with a traffic density threshold that is continuously optimized for the current level of control channel activity. Unless the accumulated measure is less than the threshold, the requesting user node is temporarily forbidden access to the control channel by a period of time designed to reduce traffic to the optimal level.

摘要翻译： 局域网采用共享控制信道，交换分布式架构配置网络的每个用户节点的频率敏捷调制解调器之间的控制消息。 除了共享控制信道之外，多个数据信道对可用于实现网络的任何两个节点之间的全双工通信。 由于所有数据信道分配取决于控制信道的成功使用，所以采用规定的控制信道争用接入方案来优化网络的所有用户对控制信道的使用，而不管其使用的需求如何。 根据该方案，每个请求节点必须首先将累积的活动度量与针对当前控制信道活动级别持续优化的业务密度阈值进行比较。 除非累积措施小于阈值，否则请求用户节点暂时禁止访问控制信道一段时间，以将流量降低到最佳水平。