公开(公告)号：US07936679B2

公开(公告)日：2011-05-03

申请号：US12322097

申请日：2009-01-29

申请人： Alfred K. Mui ,  Christopher M. Chow ,  Hojat Khelghati ,  Jalal O. Azim

发明人： Alfred K. Mui ,  Christopher M. Chow ,  Hojat Khelghati ,  Jalal O. Azim

IPC分类号： G01R31/08

CPC分类号： H04M11/062

摘要： A transceiver having shared and discrete components forming a transmit path and a receive path configured to couple to a subscriber line for establishing a communication channel with a remote transceiver. The transceiver comprises a pseudo link manager coupled between the transmit and receive path components to manage pseudo links on the subscriber line prior to entry into a session with the remote transceiver. The pseudo link manager includes: a line monitor and a disruptor. The line monitor monitors the subscriber line, prior to initiating a session, for a received communication signal indicative of a pre-existing session on the remote transceiver. The disruptor transmits a disruptor signal over the subscriber line to the remote transceiver responsive to the detection by the monitor of the received communication signal; thereby disrupting the remote transmitter's pre-existing session and allowing a new session to be established with the remote transceiver.

摘要翻译： 具有形成发送路径的共享和离散组件的收发器和被配置为耦合到用户线路以与远程收发器建立通信信道的接收路径。 收发器包括耦合在发送和接收路径组件之间的伪链路管理器，以在与远程收发器进入会话之前管理用户线路上的伪链路。 伪链路管理器包括：线路监视器和中断器。 线路监视器在发起会话之前监视用户线路，用于接收到指示远程收发器上的现有会话的通信信号。 响应于监视器对接收到的通信信号的检测，干扰器通过用户线路将干扰信号发送到远端收发器; 从而破坏远程发射机的预先存在的会话并允许与远程收发器建立新的会话。

公开(公告)号：US06445688B1

公开(公告)日：2002-09-03

申请号：US09652858

申请日：2000-08-31

申请人： Rodrigo Garces ,  Padmasheela Rayala ,  Hojat Khelghati

发明人： Rodrigo Garces ,  Padmasheela Rayala ,  Hojat Khelghati

IPC分类号： H04Q700

CPC分类号： H04B7/0608 ,  H04W16/26 ,  H04W40/06

摘要： A method and a system are provided to determine and thus select the best choice for antenna to be used by a network device having a plurality of directional antennas for a particular sending source. The determination is made using on a metric based on the success rate of packets received at a particular directional antenna from the sending source and secondarily on a received signal strength indicator. The determination is stored and made available for processing such that a router is able to request communication through a device with a destination via the second wireless communication device without knowledge of the best antenna match. In a specific method the first communication device broadcasts packets, via each associated directional antenna, to query for the existence of the second wireless communication devices. The first device then receives a plurality of information packets about existence of the second wireless communication devices in response to the broadcast packets or in response to a query about third parties. As between each directional antenna and each second wireless communication device, a packet success metric is determined for each directional antenna, which becomes the basis for antenna selection.

摘要翻译： 提供了一种方法和系统，以确定并因此为具有用于特定发送源的多个定向天线的网络设备使用的天线选择最佳选择。 基于在来自发送源的特定定向天线处接收的分组的成功率的度量来进行确定，其次在接收到的信号强度指示符上进行。 该确定被存储并使其可用于处理，使得路由器能够通过经由第二无线通信设备的具有目的地的设备来请求通信，而不知道最佳天线匹配。 在具体方法中，第一通信设备经由每个相关联的定向天线广播分组，以查询第二无线通信设备的存在。 然后，第一设备响应于广播分组或响应于关于第三方的查询，接收关于第二无线通信设备的存在的多个信息分组。 在每个定向天线和每个第二无线通信设备之间，为每个定向天线确定分组成功度量，其成为天线选择的基础。

公开(公告)号：US06718019B1

公开(公告)日：2004-04-06

申请号：US09955616

申请日：2001-09-18

申请人： Sam Heidari ,  Behrooz Rezvani ,  Hojat Khelghati ,  Yuwen Su ,  Qasem Aldrubi

发明人： Sam Heidari ,  Behrooz Rezvani ,  Hojat Khelghati ,  Yuwen Su ,  Qasem Aldrubi

IPC分类号： H04M1100

CPC分类号： H04M1/24 ,  H04M3/30

摘要： The current invention provides a method and apparatus for wireline characterization is disclosed. The method may be implemented with any modulation protocol but is particularly suited for multi-carrier modulation protocols such as discrete multi-tone (DMT). The apparatus may be incorporated into physical or logical modems. In an embodiment of the invention an apparatus for wireline characterization in a modem with a transmit path and a receive path each configured to couple with a remote modem via a wireline in which available communication bandwidth is split into a number of independent sub-channels is disclosed. The apparatus comprises: a tone selector, a cumulative loss estimator and a shift register. The tone selector selects a subset of the number of sub-channels within the bandwidth of a received wireline communication for which subset the sum of the square roots of the corresponding sub-channel indices may be expressed as an integer power “n” of 2. The cumulative loss estimator cumulates the insertion losses across the selected subset of the sub-channels and outputs a binary value corresponding thereto. The shift register couples to the cumulative loss estimator to scale a magnitude of the binary value received from the cumulative loss estimator by an amount proportionate to “n” to obtain a scaled electrical distance estimate for the wireline. Corresponding method and means are disclosed.

摘要翻译： 本发明提供一种用于电缆表征的方法和装置。 该方法可以用任何调制协议实现，但是特别适用于诸如离散多音调（DMT）的多载波调制协议。 该装置可以并入到物理或逻辑调制解调器中。 在本发明的一个实施例中，公开了一种用于具有发射路径和接收路径的调制解调器中的有线线路表征的装置，每个发送路径和接收路径被配置为经由有线将远程调制解调器耦合到其中，其中可用通信带宽被分割成多个独立子信道 。 该装置包括：音调选择器，累积损耗估计器和移位寄存器。 音调选择器选择接收的有线通信的带宽内的子信道数量子集，相应子信道索引的平方根的和可以表示为2的整数幂“n”。 累积损耗估计器累积跨所选择的子信道子集的插入损耗，并输出对应于其的二进制值。 移位寄存器耦合到累积损耗估计器，以将从累积损耗估计器接收的二进制值的大小缩放与“n”成比例的量，以获得用于有线的缩放电距离估计。 公开了相应的方法和手段。

公开(公告)号：US06516049B1

公开(公告)日：2003-02-04

申请号：US09876195

申请日：2001-06-06

申请人： Sam Heidari ,  Behrooz Rezvani ,  Hojat Khelghati ,  Yuwen Su ,  Qasem Aldrubi

发明人： Sam Heidari ,  Behrooz Rezvani ,  Hojat Khelghati ,  Yuwen Su ,  Qasem Aldrubi

IPC分类号： H04M124

CPC分类号： H04M1/24 ,  H04M3/30

摘要： The current invention provides a method and apparatus for determining insertion loss in wireline communication systems. The method may be implemented with any modulation protocol but is particularly suited for multi-carrier modulation protocols such as discrete multi-tone (DMT). The method for calculation of the insertion loss uses a received signal and a discrete subset of frequency ranges, e.g. DMT tones, within that signal. For each of the subset of frequency ranges the average received power on each of the selected set of tones is determined. Next the average power on each received subset of tones is converted to log2 using a simple log2 estimation circuit that avoids the complexity associated with log tables and other prior art methods of computing logarithms. Then the sum of the log2 of the average power received in each of the selected subset of tone bins is determined. Next, the known transmitted power for the selected subset of tones is expressed as log2, is summed and is then subtracted from the sum of the log2 of the average power received. Then using a simple electrical length estimation circuit the insertion loss is calculated. A corresponding apparatus is disclosed.

摘要翻译： 本发明提供了一种用于确定有线通信系统中的插入损耗的方法和装置。 该方法可以用任何调制协议实现，但是特别适用于诸如离散多音调（DMT）的多载波调制协议。 用于计算插入损耗的方法使用接收信号和频率范围的离散子集，例如， 该信号内的DMT音调。 对于频率范围的每个子集，确定所选择的一组音调中的每一个的平均接收功率。 接下来，使用简单log2估计电路将每个接收的音调子集的平均功率转换为log2，以避免与日志表和其他现有技术的计算对数方法相关联的复杂度。 然后确定在所选择的每个音调分组子集中接收的平均功率的log2的和。 接下来，用于所选择的音调子集的已知发射功率表示为log2，被求和，然后从所接收的平均功率的log2的和中减去。 然后使用简单的电长度估计电路计算插入损耗。 公开了相应的装置。

公开(公告)号：US20090190636A1

公开(公告)日：2009-07-30

申请号：US12322097

申请日：2009-01-29

申请人： Alfred K. Mui ,  Christopher M. Chow ,  Hojat Khelghati ,  Jalal O. Azim

发明人： Alfred K. Mui ,  Christopher M. Chow ,  Hojat Khelghati ,  Jalal O. Azim

IPC分类号： H04B1/38

CPC分类号： H04M11/062

摘要： A transceiver having shared and discrete components forming a transmit path and a receive path configured to couple to a subscriber line for establishing a communication channel with a remote transceiver. The transceiver comprises a pseudo link manager coupled between the transmit and receive path components to manage pseudo links on the subscriber line prior to entry into a session with the remote transceiver. The pseudo link manager includes: a line monitor and a disruptor. The line monitor monitors the subscriber line, prior to initiating a session, for a received communication signal indicative of a pre-existing session on the remote transceiver. The disruptor transmits a disruptor signal over the subscriber line to the remote transceiver responsive to the detection by the monitor of the received communication signal; thereby disrupting the remote transmitter's pre-existing session and allowing a new session to be established with the remote transceiver.

摘要翻译： 具有形成发送路径的共享和离散组件的收发器和被配置为耦合到用户线路以与远程收发器建立通信信道的接收路径。 收发器包括耦合在发送和接收路径组件之间的伪链路管理器，以在与远程收发器进入会话之前管理用户线路上的伪链路。 伪链路管理器包括：线路监视器和中断器。 线路监视器在发起会话之前监视用户线路，用于接收到指示远程收发器上的现有会话的通信信号。 响应于监视器对接收到的通信信号的检测，干扰器通过用户线路将干扰信号发送到远端收发器; 从而破坏远程发射机的预先存在的会话并允许与远程收发器建立新的会话。

公开(公告)号：US07035326B1

公开(公告)日：2006-04-25

申请号：US10071536

申请日：2002-02-08

申请人： Sam Heidari ,  Mazen M. Shihabi ,  Saman Behtash ,  Hojat Khelghati ,  John Gevargiz ,  Avadhani Sridhar ,  Fernando Ramirez-Mireles

发明人： Sam Heidari ,  Mazen M. Shihabi ,  Saman Behtash ,  Hojat Khelghati ,  John Gevargiz ,  Avadhani Sridhar ,  Fernando Ramirez-Mireles

IPC分类号： H03H7/40 ,  H04B1/38

CPC分类号： H04L5/0046 ,  H04L5/1438

摘要： The present invention provides a method and apparatus for demodulating data received over a communication medium carrying a transmission having multiple pilot tones with pilot data modulated thereon and message tones with message data modulated thereon and with the pilot tones and message tones frequency division multiplexed with respect to one another. In an embodiment of the invention the communication protocol utilized for modulation and demodulation is discrete multi tone (DMT). The invention allows message processing and equalizer training to proceed in parallel before equalizer training tables have been completed thus reducing the time associated with modem initialization. The apparatus in one embodiment of the invention includes on the receive path of a DMT or other multi-tone modem, a fast Fourier transform engine (FFT), a message processor, and a decoder. The FFT converts the received data from a time domain to a frequency domain. The received data in the frequency domain includes successive sets of pilot tones together with message tones. The message processor selects pairs of message and pilot tones proximate to one another in the frequency domain in each set of pilot tones and message tones. The message tone in each pair is then equalized with the pilot tone in the pair to substantially remove frequency dependent phase shifts imparted by the communication medium to the message tone. The equalized message tone is then decoded in the decoder to the corresponding specific set of message data which it represents.

摘要翻译： 本发明提供一种方法和装置，用于解调在载有具有调制其上的导频数据的多个导频音调的传输的通信媒体上接收的数据，以及在其上调制了消息数据的消息音，并且相对于 另一个。 在本发明的实施例中，用于调制和解调的通信协议是离散多音（DMT）。 本发明允许消息处理和均衡器训练在均衡器训练表已经完成之前并行进行，从而减少与调制解调器初始化相关联的时间。 本发明的一个实施例中的装置包括在DMT或其他多音调制解调器的接收路径上，快速傅里叶变换引擎（FFT），消息处理器和解码器。 FFT将接收的数据从时域转换为频域。 频域中接收到的数据包括连续的导频音集以及消息音。 消息处理器在每组导频音和消息音中在频域中选择彼此接近的消息和导频音对。 然后，每对中的消息音调与该对中的导频音调相等，以基本上消除由通信媒体向消息音色赋予的频率相关相移。 然后，均衡消息音在解码器中被解码为它所表示的对应的特定消息数据组。