公开(公告)号：US06577598B1

公开(公告)日：2003-06-10

申请号：US09286996

申请日：1999-04-07

申请人： Chien-Meen Hwang ,  Hungming Chang ,  Eugen Gershon ,  Muoi Huynh ,  Maged F. Barsoum

发明人： Chien-Meen Hwang ,  Hungming Chang ,  Eugen Gershon ,  Muoi Huynh ,  Maged F. Barsoum

IPC分类号： H04J1500

CPC分类号： H04L27/2608

摘要： A random-access local network having multiple nodes provides data communication across residential wiring such as telephone line as a network medium, where each node accesses the network medium using discrete multi-tone (DMT) modulated symbols. The effects of amplitude and phase distortion of transmitted DMT symbols are overcome, without the necessity of complex equalizers, by differentially encoding data prior to transmission, and recovering the transmitted data by comparing phase differentials between consecutive symbol tones. Each transmitted symbol is composed of a plurality of tone signals, each tone signal modulated according to a constellation point in a complex domain. A transmitter in a first node transmits a training symbol onto a network medium, where the DMT tones of the training symbol have an equal predetermined amount of energy. A second node, having received the training symbol from the network medium, transmits the received symbol as a retransmitted training symbol back onto the network medium. The first node receives the retransmitted training symbol and checks the energy level of each DMT tone of the retransmitted training symbol. Hence, the first node can identify certain DMT tones of the retransmitted training symbol as highly attenuated if the respective energy levels fall below a prescribed threshold. The first node then selects the DMT tones for transmission by avoiding the certain DMT tones that are highly attenuated.

摘要翻译： 具有多个节点的随机接入本地网络提供诸如作为网络媒体的电话线等住宅布线之间的数据通信，其中每个节点使用离散多音（DMT）调制符号来访问网络介质。 通过在传输之前对数据进行差分编码，并且通过比较连续符号音之间的相位差来恢复发送的数据，克服了传输的DMT符号的幅度和相位失真的影响，而不需要复数均衡器。 每个发送的符号由多个音调信号组成，每个音调信号根据复杂域中的星座点进行调制。 第一节点中的发射机将训练符号发送到网络介质上，其中训练符号的DMT音调具有相等的预定量的能量。 已经从网络介质接收到训练符号的第二节点将接收的符号作为重传的训练符号发送回网络介质。 第一节点接收重传的训练符号并且检查重传的训练符号的每个DMT音调的能级。 因此，如果相应的能量级别低于规定的阈值，则第一节点可以将重传的训练符号的某些DMT音调识别为高度衰减。 然后，第一节点通过避免高度衰减的某些DMT音调来选择用于发送的DMT音调。

公开(公告)号：US06175316B1

公开(公告)日：2001-01-16

申请号：US09287263

申请日：1999-04-07

申请人： Maged F. Barsoum ,  Hungming Chang ,  Eugen Gershon ,  Chien-Meen Hwang ,  Muoi V. Huynh

发明人： Maged F. Barsoum ,  Hungming Chang ,  Eugen Gershon ,  Chien-Meen Hwang ,  Muoi V. Huynh

IPC分类号： H03M510

CPC分类号： H04L27/2602 ,  H03M5/10

摘要： A discrete multi-tone communication system employing bin-to-bin differential encoding of data frames to be transmitted within the communication system. The bin-to-bin differential encoding utilizes the phase angle of previously encoded data to encode the current data relative to that phase angle. Hence, only a single reference tone is required to encode a first portion of the data frame into a discrete tone, and then the remaining data portions of the data frame are each subsequently encoded into discrete tones with reference to the phase angle of data already encoded into a discrete tone. Thus, to achieve decoding, a decoding device only requires the reference tone to begin decoding the discrete tones to the correct phase angle for an accurate reproduction of the original data frame.

摘要翻译： 一种离散的多音通信系统，采用在通信系统内发送的数据帧的二进制差分编码。 bin到bin的差分编码利用先前编码的数据的相位角来相对于该相位角对当前数据进行编码。 因此，仅需要单个参考音来将数据帧的第一部分编码成离散音调，然后参考已经编码的数据的相位角，数据帧的剩余数据部分随后被编码成离散音调 变成离散的音调。 因此，为了实现解码，解码装置仅需要参考音开始将离散音调解码为正确的相位角，以准确再现原始数据帧。

公开(公告)号：US06246267B1

公开(公告)日：2001-06-12

申请号：US09286998

申请日：1999-04-07

申请人： Maged F. Barsoum ,  Hungming Chang ,  Eugen Gershon ,  Chien-Meen Hwang ,  Muoi V. Huynh

发明人： Maged F. Barsoum ,  Hungming Chang ,  Eugen Gershon ,  Chien-Meen Hwang ,  Muoi V. Huynh

IPC分类号： G01R2500

CPC分类号： G01R19/25

摘要： A method and apparatus for detecting a sinusoidal signal samples a received signal. An error signal generator receives at its inputs a previous sample of the received signal and a current sample of the received signal and generates an error signal based on these previous and current samples. A comparison circuit compares the generated error signal for the current sample to an error threshold value and generates a threshold comparison signal with a first value that indicates the generated error signal is below the error threshold value for a second value that indicates a generated error signal is above the error threshold value. A determination circuit then determines whether the received signal is a sinusoidal signal based on a threshold comparison signal generated for a plurality of samples. The determination circuit includes a counter that maintains a count of the number of threshold comparison signals having the first value within a sampling period.

摘要翻译： 用于检测正弦信号的接收信号的采样方法和装置。 误差信号发生器在其输入端接收接收信号的先前采样和接收信号的当前采样，并根据这些先前和当前采样产生误差信号。 比较电路将当前采样的所产生的误差信号与误差阈值进行比较，并产生具有第一值的阈值比较信号，该第一值指示所产生的误差信号低于第二值的误差阈值，该第二值指示所产生的误差信号为 高于误差阈值。 然后，确定电路基于为多个样本生成的阈值比较信号来确定接收到的信号是否是正弦信号。 确定电路包括计数器，其维持在采样周期内具有第一值的阈值比较信号的数量的计数。

公开(公告)号：US06590893B1

公开(公告)日：2003-07-08

申请号：US09286997

申请日：1999-04-07

申请人： Chien-Meen Hwang ,  Eugen Gershon ,  Maged F. Barsoum ,  Hungming Chang ,  Muoi V. Huynh ,  Fred Berkowitz ,  Bin Guo

发明人： Chien-Meen Hwang ,  Eugen Gershon ,  Maged F. Barsoum ,  Hungming Chang ,  Muoi V. Huynh ,  Fred Berkowitz ,  Bin Guo

IPC分类号： H04J306

CPC分类号： H04L1/1819 ,  H04L1/1678 ,  H04L1/189 ,  H04L27/2608

摘要： A network node configured for transmitting and receiving data to and from other network nodes is able to adapt the transmission rate based on the network conditions. The node initially transmits the data to a receiving node at a first rate. If the data is not received error-free, the node is able to reduce the number of data bits of the current packet that are being transmitted and to increase the amount of redundant data. The node repeats the process until error-free transmission is obtained.

摘要翻译： 配置用于向和从其他网络节点发送和接收数据的网络节点能够根据网络条件来适应传输速率。 节点首先以第一速率将数据发送到接收节点。 如果数据没有无错误地接收，则该节点能够减少正在发送的当前分组的数据比特数，并增加冗余数据量。 节点重复该过程，直到获得无差错的传输。

公开(公告)号：US06252428B1

公开(公告)日：2001-06-26

申请号：US09286991

申请日：1999-04-07

申请人： Maged F. Barsoum ,  Hungming Chang ,  Eugen Gershon ,  Chien-Meen Hwang ,  Muoi V. Huynh

发明人： Maged F. Barsoum ,  Hungming Chang ,  Eugen Gershon ,  Chien-Meen Hwang ,  Muoi V. Huynh

IPC分类号： H03K906

CPC分类号： G01R29/04 ,  G01R19/2506

摘要： A method and apparatus for detecting a sinusoidal signal samples a received signal. An error signal generator receives at its inputs two previous samples of the signal and a current sample of the signal and generates an error signal based on these previous and current samples. A comparison circuit compares the generated error signal for the current sample to an error threshold value and generates a threshold comparison signal that indicates whether the generated error signal is below the error threshold value. A determination circuit then determines whether the received signal is a sinusoidal signal based on the threshold comparison signals that are generated for a plurality of samples.

摘要翻译： 用于检测正弦信号的接收信号的采样方法和装置。 误差信号发生器在其输入端接收信号的两个先前样本和信号的当前样本，并且基于这些先前和当前采样产生误差信号。 比较电路将当前采样的所生成的误差信号与误差阈值进行比较，并产生指示所生成的误差信号是否低于误差阈值的阈值比较信号。 然后，确定电路基于为多个样本生成的阈值比较信号来确定接收到的信号是否是正弦信号。

公开(公告)号：US06449262B1

公开(公告)日：2002-09-10

申请号：US09286993

申请日：1999-04-07

申请人： Chien-Meen Hwang ,  Muoi V. Huynh ,  Maged F. Barsoum ,  Hungming Chang ,  Eugen Gershon

发明人： Chien-Meen Hwang ,  Muoi V. Huynh ,  Maged F. Barsoum ,  Hungming Chang ,  Eugen Gershon

IPC分类号： H04J400

CPC分类号： H04L27/0002 ,  H04L27/2626 ,  H04L27/2647

摘要： A physical layer device (PHY) device in a home LAN employs discrete multitone technology (DMT). The DMT system enables usage of existing residential wiring, which typically is telephone system grade twisted copper pair. The PHY device comprises an analog front end (AFE) circuit that frequency shifts the spectral images by using a clock signal. The multiplication of the clock signal is accomplished using a digital mixer or, in the alternative, an analog switch.

摘要翻译： 家庭LAN中的物理层设备（PHY）设备采用离散多音频技术（DMT）。 DMT系统能够使用现有的住宅布线，这通常是电话系统级双绞线对。 PHY设备包括通过使用时钟信号对频谱图像进行频移的模拟前端（AFE）电路。 时钟信号的相乘使用数字混频器或者替代的模拟开关实现。

公开(公告)号：US06434188B1

公开(公告)日：2002-08-13

申请号：US09286989

申请日：1999-04-07

申请人： Chien-Meen Hwang ,  Hungming Chang ,  Maged F. Barsoum ,  Muoi V. Huynh ,  Eugen Gershon ,  Fred Berkowitz ,  Bin Guo

发明人： Chien-Meen Hwang ,  Hungming Chang ,  Maged F. Barsoum ,  Muoi V. Huynh ,  Eugen Gershon ,  Fred Berkowitz ,  Bin Guo

IPC分类号： H04B138

CPC分类号： H04L27/2602

摘要： A random-access local network having multiple nodes provides data communication across residential wiring such as telephone line as a network medium, where each node accesses the network medium using discrete multi-tone (DMT) modulated symbols. The effects of amplitude and phase distortion of transmitted DMT symbols are overcome, without the necessity of complex equalizers, by differentially encoding data prior to transmission, and recovering the transmitted data by comparing phase differentials between consecutive symbol tones. Each transmitted symbol is composed of a plurality of tone signals, each tone signal modulated according to a constellation point in a complex domain. A transmitter modulates data, such as a bit-pair, to a new constellation point based on the value of the bit-pair and a prior position of a consecutively-preceding constellation point, such that the data is represented by the difference in positions between the consecutively-preceding constellation point and the new constellation point. The constellation points are then used to modulate a selected one of the tone signals. Although a receiver detecting the modulated tone signal may recover the transmitted constellation points at different absolute positions due to distortion on he network medium, the relative difference between the consecutively-preceding constellation point and the new constellation point is preserved, enabling the receiver to recover the transmitted data based on the relative difference in positions of the consecutive constellation points. Hence, entire bit stream can reliably transmitted using position changes between consecutive constellation points.

摘要翻译： 具有多个节点的随机接入本地网络提供诸如作为网络媒体的电话线等住宅布线之间的数据通信，其中每个节点使用离散多音（DMT）调制符号来访问网络介质。 通过在传输之前对数据进行差分编码，并且通过比较连续符号音之间的相位差来恢复发送的数据，克服了传输的DMT符号的幅度和相位失真的影响，而不需要复数均衡器。 每个发送的符号由多个音调信号组成，每个音调信号根据复杂域中的星座点进行调制。 发射机基于比特对的值和连续前面的星座点的先前位置，将诸如比特对的数据调制到新的星座点，使得数据由 连续前面的星座点和新的星座点。 然后使用星座点来调制所选择的一个音调信号。 虽然检测调制音信号的接收机可以由于网络介质上的失真而恢复在不同绝对位置处的发射星座点，但保持连续前面的星座点与新星座点之间的相对差异，使得接收机能够恢复 基于连续星座点的位置的相对差异发送数据。 因此，使用连续星座点之间的位置变化可以可靠地发送整个比特流。

公开(公告)号：US6075795A

公开(公告)日：2000-06-13

申请号：US286994

申请日：1999-04-07

申请人： Maged F. Barsoum ,  Chien-Meen Hwang ,  Hungming Chang ,  Muoi V. Huynh ,  Eugen Gershon

发明人： Maged F. Barsoum ,  Chien-Meen Hwang ,  Hungming Chang ,  Muoi V. Huynh ,  Eugen Gershon

IPC分类号： H04J3/24

CPC分类号： H04L12/413 ,  H04W74/0825 ,  H04L27/2626 ,  H04L5/0046 ,  H04L5/006 ,  H04L5/0091

摘要： A novel collision detecting method is provided at the physical layer for use in a multi-point DMT communication network having stations transmitting over common media. The method includes generating a collision code corresponding to ID information of a station. A collision symbol representing the collision code is transmitted at the beginning of a portion of a random access data communication. A station in the network receives the collision symbol and decodes a collision signal carried by the collision symbol. A collision event is detected if the collision signal does not satisfy pre-set requirements. For example, energy of each component of the collision signal may be compared with a predetermined minimum energy level to generate a code element for each component having energy exceeding the predetermined minimum energy level. Validity of the code having the generated code elements is determined based on a predetermined validity criterion. Also, the distance in frequency domain between components of the collision signal corresponding to the generated code elements is compared with a predetermined minimum distance in frequency domain, to confirm validity of the detected code.

摘要翻译： 在物理层提供了一种新颖的冲突检测方法，用于具有通过公共媒体传送的站点的多点DMT通信网络。 该方法包括生成与站的ID信息对应的冲突码。 在随机访问数据通信的一部分的开始处发送表示冲突码的冲突符号。 网络中的站接收冲突符号并解码由碰撞符号携带的冲突信号。 如果碰撞信号不满足预先设定的要求，则检测到碰撞事件。 例如，可以将冲突信号的每个分量的能量与预定的最小能级进行比较，以产生具有超过预定最小能级的能量的每个分量的代码元素。 基于预定的有效性标准确定具有生成的代码元素的代码的有效性。 此外，将与生成的代码元素相对应的冲突信号的分量之间的频域的距离与频域中的预定最小距离进行比较，以确认检测到的代码的有效性。

公开(公告)号：US06456602B1

公开(公告)日：2002-09-24

申请号：US09286992

申请日：1999-04-07

申请人： Chien-Meen Hwang ,  Muoi V. Huynh ,  Maged F. Barsoum ,  Hungming Chang ,  Eugen Gershon

发明人： Chien-Meen Hwang ,  Muoi V. Huynh ,  Maged F. Barsoum ,  Hungming Chang ,  Eugen Gershon

IPC分类号： H04J300

CPC分类号： H04L7/033 ,  H04B7/12 ,  H04L27/2647

摘要： A physical layer device (PHY) device in a home LAN employs discrete multitone technology (DMT). The DMT system enables usage of existing residential wiring, which typically is telephone system grade twisted copper pair. The PHY device comprises a spectral image selection circuit to increase frequency diversity by examining all the images captured by a filter and restoring the transmitted signal based upon an image that may not be associated with the carrier frequency but its harmonics. Alternatively, the PHY device adjusts the sampling rate of its digital to analog convertor and accordingly filters to achieve desired grouping of spectral images.

摘要翻译： 家庭LAN中的物理层设备（PHY）设备采用离散多音频技术（DMT）。 DMT系统能够使用现有的住宅布线，这通常是电话系统级双绞线对。 PHY设备包括频谱图像选择电路，以通过检查由滤波器捕获的所有图像来增加频率分集，并且基于可能不与载波频率但其谐波相关联的图像来恢复所发送的信号。 或者，PHY设备调整其数模转换器的采样率，并因此滤波以实现期望的光谱图像分组。

公开(公告)号：US06339599B1

公开(公告)日：2002-01-15

申请号：US09286987

申请日：1999-04-07

申请人： Chien-Meen Hwang ,  Hungming Chang ,  Maged F. Barsoum ,  Muoi V. Huynh ,  Eugen Gershon ,  Fred Berkowitz

发明人： Chien-Meen Hwang ,  Hungming Chang ,  Maged F. Barsoum ,  Muoi V. Huynh ,  Eugen Gershon ,  Fred Berkowitz

IPC分类号： H04J324

CPC分类号： H04L27/2626 ,  H04L27/2071 ,  H04L27/2647 ,  H04M11/062

摘要： A novel collision detecting method at the physical layer is provided for use in a multi-point DMT communication system. A time mark transmitted at the beginning of a portion of a random access data communication is followed by an ID signal for identifying the communication station. The ID signal produced based on the time mark may be transmitted between the time mark and a data portion of the random access data communication. The time mark distorted by a communication channel is received by a receiver of the station that transmitted it. An additional ID signal representing the same ID data as the ID signal is produced based on the received time mark. The additional ID signal is compared with the ID signal received from the communication channel. A collision event is detected if the incoming ID signal does not match the additional ID signal. In response to the detection of the collision event, the transmission of the data portion is terminated.

摘要翻译： 提供了一种用于物理层的新型碰撞检测方法，用于多点DMT通信系统。 在随机访问数据通信的一部分的开始处发送的时间标记之后是用于识别通信站的ID信号。 可以在时间标记与随机访问数据通信的数据部分之间发送基于时间标记产生的ID信号。 由通信信道失真的时间标记由发送它的站的接收机接收。 基于接收到的时间标记产生表示与ID信号相同的ID数据的附加ID信号。 将附加ID信号与从通信信道接收的ID信号进行比较。 如果进入的ID信号与附加的ID信号不匹配，则检测到碰撞事件。 响应于碰撞事件的检测，数据部分的传输被终止。