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公开(公告)号：US5881108A
公开(公告)日：1999-03-09
申请号：US605404
申请日：1996-02-22
CPC分类号： H04L25/4975 , H04L25/03343 , H04L2025/03802
摘要： The problem of error propagation is resolved by using the communications channel to adapt a pre-equalizer of a transmitter, in response to changes in the communications channel. In particular, the pre-equalizer adapts to changes in the communications channel by processing an error signal that is communicated over a reverse channel by a corresponding receiver.
摘要翻译： 响应于通信信道的变化，通过使用通信信道来适配发射机的前置均衡器来解决误差传播的问题。 特别地，预均衡器通过处理通过相应接收机在反向信道上传送的错误信号来适应通信信道的变化。
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公开(公告)号：US5751701A
公开(公告)日：1998-05-12
申请号：US690243
申请日：1996-07-19
摘要： The invention provides a transceiver which is preferably used for high speed communications between a customer location and a central office over a subscriber line. The transceiver uses a pseudorandom noise generator both to provide a correlation for a complementary transceiver to use in achieving synchronization and as a way to transmit data in an extremely robust fashion. In addition, the transceiver uses frequency domain multiplexing so that downstream data and upstream data are transmitted by their respective transceivers in completely separate and distinct frequency bands. In order to achieve high data transfer rates, the transceivers can operate in an asymmetrical manner, whereby either (but, typically, the central office) transceiver can transmit data at a higher rate than the other transceiver.
摘要翻译： 本发明提供一种收发器，其优选地用于在用户线路上的客户位置和中心局之间的高速通信。 收发器使用伪随机噪声发生器来提供互补收发器的相关性，以用于实现同步，并且作为以非常鲁棒的方式传输数据的方式。 此外，收发器使用频域复用，使得下行数据和上行数据由它们各自的收发器以完全分离和不同的频带发送。 为了实现高数据传输速率，收发器可以以非对称方式操作，由此（但是，通常，中心局）收发器可以以比另一个收发器更高的速率发送数据。
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公开(公告)号：US5703905A
公开(公告)日：1997-12-30
申请号：US602944
申请日：1996-02-16
申请人： Ehud Langberg
发明人： Ehud Langberg
CPC分类号： H04L7/0278 , H04L7/0062 , H04L7/0083
摘要： An "N" channel receiver system includes "N" A/D converters, one per channel, sampling the data received by their respective channels. The sampling rate of the A/D converters is controlled by a sampling clock signal generated by a timing recovery circuit. One rate of the sampling clock is a function of a timing signal applied to the timing recovery circuit. The system may be configured so that each channel produces N distinct timing signals, corresponding to the data signals received by each one of the N channels. The N distinct timing signals are coupled to a mechanism configured to selectively couple one of the N distinct timing signals to the timing recovery circuit. In a preferred embodiment, the signal-to-noise ratio (SNR) of the N received signals is sensed and the timing signal of the channel having the highest SNR is coupled via the controllable.
摘要翻译： “N”信道接收机系统包括“N”个A / D转换器，每个通道一个采样其各自信道接收的数据。 A / D转换器的采样率由定时恢复电路产生的采样时钟信号控制。 采样时钟的一个速率是施加到定时恢复电路的定时信号的函数。 该系统可以被配置为使得每个信道产生N个不同的定时信号，对应于由N个信道中的每一个接收的数据信号。 N个不同的定时信号被耦合到被配置为选择性地将N个不同定时信号之一耦合到定时恢复电路的机构。 在优选实施例中，感测N个接收信号的信噪比（SNR），并且具有最高SNR的信道的定时信号通过可控的耦合。
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公开(公告)号：US5513216A
公开(公告)日：1996-04-30
申请号：US322877
申请日：1994-10-13
申请人： Shlomo Gadot , Gi-Hong Im , Ehud Langberg , Jin-Der Wang
发明人： Shlomo Gadot , Gi-Hong Im , Ehud Langberg , Jin-Der Wang
IPC分类号： H03H21/00 , H04B3/14 , H04L25/03 , H04L25/497 , H04L27/01
CPC分类号： H04L25/4975 , H04L25/03057 , H04L25/03343 , H04L25/497 , H04L2025/03503 , H04L2025/03808
摘要： A hybrid type of decision feedback equalizer (DFE) structure that approaches optimal DFE performance is described. The hybrid DFE includes both an intersymbol interference DFE (ISI-DFE) and a noise predictive DFE (NP-DFE). The hybrid DFE structure is designed so that one form of tap values dominates over the other. This allows only the dominate tap values to be used by the transmitter during precoding and reduces the transmitter complexity. In particular, a hybrid DFE is designed so that the I(z) coefficient values dominate over the N(z) coefficient values, where the notation I(z) and N(z), as known in the art, represent the resulting coefficient values after adaptation of the ISI-DFE and the NP-DFE, respectively. A respective Tomlinson precoding scheme in the transmitter uses only the I(z) values. Since only the I(z) values are used in the precoder of the transmitter, the NP-DFE of the receiver is kept active during the communications phase. Conveniently, the continued use of the NP-DFE in the receiver allows the receiver to track small changes in the channel.
摘要翻译： 描述了接近最优DFE性能的混合型判决反馈均衡器（DFE）结构。 混合DFE包括符号间干扰DFE（ISI-DFE）和噪声预测DFE（NP-DFE）。 混合DFE结构被设计成使得一种形式的抽头值占主导地位。 这只允许发射机在预编码期间使用主要抽头值，并降低发射机的复杂度。 特别地，混合DFE被设计为使得I（z）系数值在N（z）系数值上占优势，其中本领域已知的符号I（z）和N（z）表示所得系数 分别适应ISI-DFE和NP-DFE后的值。 发射机中各自的Tomlinson预编码方案仅使用I（z）值。 由于在发射机的预编码器中仅使用I（z）值，因此接收机的NP-DFE在通信阶段保持有效。 方便地，在接收机中继续使用NP-DFE允许接收机跟踪信道中的小变化。
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