公开(公告)号：US08711741B1

公开(公告)日：2014-04-29

申请号：US11807006

申请日：2007-05-24

申请人： Sam Heidari ,  Hossein Dehghan ,  Sigurd Schelstraete

发明人： Sam Heidari ,  Hossein Dehghan ,  Sigurd Schelstraete

IPC分类号： H04J1/12 ,  H04J1/16 ,  H04B3/20 ,  H04J4/00 ,  H04L5/16

CPC分类号： H04B3/20 ,  H04B3/235 ,  H04B3/54 ,  H04L5/0007 ,  H04L5/0044 ,  H04L5/0064 ,  H04L5/143 ,  H04L5/1461 ,  H04L27/265

摘要： Networked modems configurable to establish a communication system on a wired communication medium. Each modem includes: a network module, transmit and receive path modules and a frequency domain echo canceller. The network module is configured to communicate with network modules of remaining ones of the at least three modems to allocate bandwidth of the shared communications medium for at least two discrete point-to-point communication links between corresponding pairs of the at least three modems. The transmit and receive path modules are configured for multi-tone modulation and demodulation of communications on the wired communication medium and are responsive to the bandwidth allocation of the network module to concurrently process at least a first discrete point-to-point communication link with a first modem among remaining ones of the at least three modems and at least a second discrete point-to-point communication link with a second among remaining ones of the at least three modems. The frequency domain echo canceller is configured to substantially cancel leakage of the communications transmitted on the transmit path into the receive path and to enable each point-to-point communication link to support full duplex communications.

摘要翻译： 网络调制解调器可配置为在有线通信介质上建立通信系统。 每个调制解调器包括：网络模块，发射和接收路径模块和频域回波消除器。 所述网络模块被配置为与所述至少三个调制解调器中的剩余调制解调器的网络模块通信，以为所述至少三个调制解调器的相应对之间的至少两个离散点对点通信链路分配共享通信介质的带宽。 发送和接收路径模块被配置用于有线通信介质上的通信的多频调制和解调，并且响应于网络模块的带宽分配来同时处理至少第一离散点对点通信链路 所述至少三个调制解调器的剩余的调制解调器中的第一调制解调器和至少三个调制解调器的剩余的调制解调器中的至少一个的至少第二离散点对点通信链路中的第二调制解调器。 频域回波消除器被配置为基本上消除在发送路径上发送的通信到接收路径的泄漏，并且使得每个点对点通信链路能够支持全双工通信。

公开(公告)号：US08599780B2

公开(公告)日：2013-12-03

申请号：US13096885

申请日：2011-04-28

申请人： Sam Heidari ,  Ali Rouhi ,  Rajkumar Samuel

发明人： Sam Heidari ,  Ali Rouhi ,  Rajkumar Samuel

IPC分类号： H04W84/02

CPC分类号： H04W24/02 ,  H04B7/2606 ,  H04W16/20 ,  H04W16/26 ,  H04W84/045 ,  H04W84/12

摘要： A technique for expanding the range of coverage for a wireless local area network (WLAN) involves locating a wireless access point (WAP) away from an interworking unit (IWU) at the edges of the WLAN and a (typically) wired network. The WAP, when located away from the IWU, can be referred to as an untethered access point (UAP) because it communicates with the IWU on a wireless channel. Stations on the WLAN will be capable of communicating with the WAP, whether or not it is a UAP, via a known or convenient wireless protocol, such as Wi-Fi, and may or may not be capable of communicating with one another via a direct station-to-station protocol.

摘要翻译： 用于扩展无线局域网（WLAN）的覆盖范围的技术涉及将无线接入点（WAP）远离WLAN和（通常）有线网络的边缘处的互通单元（IWU）定位。 当远离IWU时，WAP可以被称为无限制接入点（UAP），因为它与无线信道上的IWU进行通信。 WLAN上的站将能够通过已知或方便的无线协议（例如Wi-Fi）与WAP通信，无论它是否是UAP，并且可能或可能不能够通过直接的方式彼此通信 站对站协议。

公开(公告)号：US20120307934A1

公开(公告)日：2012-12-06

申请号：US13513191

申请日：2011-01-12

申请人： Sam Heidari ,  Rajkumar Samuel ,  Sigurd Schelstraete

发明人： Sam Heidari ,  Rajkumar Samuel ,  Sigurd Schelstraete

IPC分类号： H04L27/00

CPC分类号： H04L1/0017 ,  H04B7/0413 ,  H04L1/0003 ,  H04L1/0009 ,  H04L2001/0098

摘要： Adjusting a Modulation and Coding Scheme (MCS) or more generally, Layer One parameters, for a data packet based on packet information and priority is disclosed. The packet information can typically be extracted from the packet's header. Considering packet-specific information enables cross-layer optimization that can include consideration of packet error rate (PER) constraints, delay constraints, relative importance of packets within a data stream, beamforming (e.g., off or on, implicit or explicit—longer distances are more likely to merit implicit beamforming) constraints, and aggregation as a function of MCS or channel condition (more aggregation is generally desirable for higher MCS or better channels), to name several examples. It is also possible to differentiate drop probability based on the importance of frames like anchor frames, etc.

摘要翻译： 公开了基于分组信息和优先级调整调制和编码方案（MCS）或更一般地，针对数据分组的第一层参数。 分组信息通常可以从分组报头中提取出来。 考虑到分组特定的信息使跨层优化能够包括考虑分组错误率（PER）约束，延迟约束，数据流内分组的相对重要性，波束成形（例如，关闭或接通，隐式或显式更长的距离） 更可能优于隐含波束形成）约束，并且聚合作为MCS或信道条件的函数（对于更高的MCS或更好的信道，更多的聚合通常是期望的），举出几个例子。 还可以根据帧的重要性来区分丢弃概率，例如锚帧等。

公开(公告)号：US08223859B2

公开(公告)日：2012-07-17

申请号：US12459129

申请日：2009-06-25

申请人： Sam Heidari ,  Sivannarayana Nagireddi ,  Sigurd Schelstraete ,  Avadhani Shridhar

发明人： Sam Heidari ,  Sivannarayana Nagireddi ,  Sigurd Schelstraete ,  Avadhani Shridhar

IPC分类号： H04K1/10 ,  H04L27/28

CPC分类号： H04B3/542 ,  H04B2203/5408 ,  H04B2203/5445 ,  H04B2203/5454 ,  H04L5/0037 ,  H04L5/0064 ,  H04L5/0092 ,  H04L5/1438

摘要： A multi-tone modem with shared and discrete components forming a transmit path and a receive path configured to couple to a wired communication medium to communicate at least one multi-tone modulated communication channel thereon. The modem includes a multi-tone modulator component and a configurable frequency up converter component. The multi-tone modulator component is configured for multi-tone modulation and demodulation of a transmitted and received communication channel at a base band frequency range. The configurable frequency up converter component is coupled to the multi-tone modulator to selectably up convert the frequency range of the transmitted base band signal from the multi-tone modulator to that of a selected communication band and down convert received signals from the selected communication band to the base band for demodulation by the multi-tone modulator.

摘要翻译： 具有形成发送路径的共享和分立组件的多音调制解调器和被配置为耦合到有线通信介质以在其上通信至少一个多音调调制通信信道的接收路径。 调制解调器包括多音调制器组件和可配置的升频转换器组件。 多音调制器部件被配置为在基带频率范围内对发送和接收的通信信道进行多音调制和解调。 可配置的上变频器组件耦合到多音调制器以可选择地将来自多音调制器的发射基带信号的频率范围转换成所选择的通信频带的频率范围，并且将来自所选择的通信频带的接收信号 到基带以进行多音调制器的解调。

公开(公告)号：US20110058535A1

公开(公告)日：2011-03-10

申请号：US12800309

申请日：2010-05-11

申请人： Amir Hadi Djahanshahi ,  Ravi Narasimhan ,  Jim Wood ,  Farrokh Farrokhi ,  Sam Heidari ,  Vahbod Pourahmad ,  Jihoon Yoon

发明人： Amir Hadi Djahanshahi ,  Ravi Narasimhan ,  Jim Wood ,  Farrokh Farrokhi ,  Sam Heidari ,  Vahbod Pourahmad ,  Jihoon Yoon

IPC分类号： H04W40/00

CPC分类号： G01S7/021 ,  H04L1/0071 ,  H04W16/14

摘要： A low complexity primary user detection system is disclosed. Signals are filtered to reduce the number of signals that must be processed. Width and PRI of the signals are used to match a constellation associated with a primary user. If the constellation is matched, communication parameters are adjusted to make way for the primary user.

摘要翻译： 公开了一种低复杂度的主用户检测系统。 信号被过滤以减少必须处理的信号数量。 信号的宽度和PRI用于匹配与主用户相关联的星座。 如果星座匹配，则调整通信参数以使主用户方便。

公开(公告)号：US07881362B2

公开(公告)日：2011-02-01

申请号：US11901346

申请日：2007-09-15

申请人： Avadhani Shridhar ,  Sam Heidari ,  Rouben Toumani ,  Ying Wu

发明人： Avadhani Shridhar ,  Sam Heidari ,  Rouben Toumani ,  Ying Wu

IPC分类号： H04B1/38

CPC分类号： H04L5/006 ,  H04L5/0042 ,  H04L5/0046

摘要： A multi-tone transceiver including: a channel controller and a plurality of components forming a transmit path and a receive path. The channel controller configured to determine bit-loading for each successive symbol or tone set based on a 1st noise margin target for a first subset of tones in each tone set dedicated to transport of a robust communications channel (RCC) and based on a 2nd noise margin target less than the 1st noise margin target for remaining tones in each tone set dedicated to a standard communications channel (SCC). The plurality of components forming the transmit and receive paths are responsive to the channel controller to select for data modulated on a given tone at least one of smaller constellations and higher gain scaling levels when the given tone corresponds to an RCC tone as compared to an SCC tone, whereby the first set of tones dedicated to the RCC exhibit greater immunity to noise variations than the remaining tones dedicated to the SCC.

摘要翻译： 一种多音调收发器，包括：信道控制器和形成发送路径和接收路径的多个组件。 所述信道控制器被配置为基于专用于传输鲁棒通信信道（RCC）的每个音调集合中的第一音调子集的第一噪声容限目标以及基于第二噪声来确定每个连续符号或音调集合的比特加载 余量目标小于专用于标准通信信道（SCC）的每个音调集合中的剩余音调的第一噪声容限度目标。 形成发送和接收路径的多个组件响应于信道控制器，以便在给定音调对应于RCC音调与SCC相比时，为给定音调调制的数据中的至少一个较小星座和较高增益缩放级别 音调，由此专用于RCC的第一组音调比专用于SCC的剩余音调具有更大的对噪声变化的抗扰度。

公开(公告)号：US20100046738A1

公开(公告)日：2010-02-25

申请号：US12583694

申请日：2009-08-24

申请人： Sigurd Schelstraete ,  Sam Heidari

发明人： Sigurd Schelstraete ,  Sam Heidari

IPC分类号： H04M9/08

CPC分类号： H04B3/32 ,  H04L25/03343 ,  H04L2025/03426 ,  H04M11/062

摘要： An apparatus for precoding multi-tone modulated transmissions of a plurality of communication channels over bundled subscriber lines. The apparatus includes a pseudo symbol controller and a precoder. The pseudo symbol controller detects a victim communication channel and an interferer communication channel having non-matching symbol rates, and transforms the interferor channel into a pseudo-symbol having both a substantially similar length as a corresponding symbol of the victim channel together with defined tonal characteristics expressed in terms of the interferor channel. The precoder assigns crosstalk coefficients to selected sub-channels or tones of the pseudo symbol and precodes the victim channel with the pseudo symbol using the crosstalk coefficients; thereby generating a precoded victim symbol which exhibits reduced crosstalk between the selected victim and interferor.

摘要翻译： 一种用于通过捆绑用户线路预编码多个通信信道的多音调调制传输的装置。 该装置包括伪符号控制器和预编码器。 伪符号控制器检测受害者通信信道和具有不匹配符号率的干扰信道，并将干扰信道转换成具有与受害信道的对应符号基本相似的长度的伪符号以及定义的音调特征 以干扰信道表示。 预编码器将串扰系数分配给伪符号的选择子信道或音调，并使用串扰系数对伪信号进行预编码; 从而产生在所选择的受害者和干扰者之间表现出减少的串扰的预编码的受害者符号。

公开(公告)号：US07443918B1

公开(公告)日：2008-10-28

申请号：US11980832

申请日：2007-10-30

申请人： Rouben Toumani ,  Sam Heidari

发明人： Rouben Toumani ,  Sam Heidari

IPC分类号： H04K1/10

CPC分类号： H04L5/14 ,  H04L27/2601

摘要： An inverse discrete Fourier transform (IDFT) processor processing a lower frequency image of a selected transmit band along with base images of remaining transmit bands called for in a corresponding X-DSL standard. A hybrid upconverter processing the IDFT output by generating a higher frequency replication of the imaged transmit band falling in the standards based frequency range along with the base band images of remaining transmit bands and selectively passing onto the communication medium only images or replications called for by the standards. A hybrid downconverter processing at least one of the received bands at sampling rates below Nyquist thereby creating a lower frequency image within the range of a discrete Fourier transform (DFT) processor. The hybrid downconverter clears the frequency band in which the image processed at sub-Nyquist rates will fold. The DFT then transforms only the images or replications falling within its frequency range.

摘要翻译： 逆离散傅里叶变换（IDFT）处理器处理所选发射频带的较低频率图像以及在相应的X-DSL标准中所要求的剩余发射频带的基本图像。 混合上变频器通过产生落在基于标准的频率范围内的成像发射频带的较高频率复制以及剩余发射频带的基带图像来处理IDFT输出，并且仅选择性地传递到通信介质上仅图像或由 标准。 混合下变频器以低于奈奎斯特采样速率处理接收频带中的至少一个，从而在离散付里叶变换（DFT）处理器的范围内产生较低频率图像。 混合下变频器清除以奈奎斯特速率处理的图像将折叠的频带。 DFT然后仅转换落在其频率范围内的图像或复制。

公开(公告)号：US07076010B1

公开(公告)日：2006-07-11

申请号：US09876201

申请日：2001-06-06

申请人： Sam Heidari ,  Raminder S. Bajwa ,  Behrooz Rezvani ,  Dale Smith ,  Prem Ramaswamy

发明人： Sam Heidari ,  Raminder S. Bajwa ,  Behrooz Rezvani ,  Dale Smith ,  Prem Ramaswamy

IPC分类号： H03K5/01

CPC分类号： H04B3/142 ,  H04L25/0216 ,  H04L25/03038 ,  H04L25/03133 ,  H04L2025/03414 ,  H04L2025/03585

摘要： The current invention provides a method and apparatus for time domain equalization in an XDSL modem. A received communication channel is analyzed to determine the highest frequency component thereof. Typically, there is an inverse relationship between the length of a subscriber line and the highest frequency component over which communications can be supported. In response to the frequency determination, the sampling rate for the channel is reduced to the lowest sample rate consistent with maintaining signal integrity on the highest frequency component of the channel. The sampling rate reduction may accomplished in the analog portion of the receive path, e.g. the analog-to-digital converter (ADC) or in a digital decimator coupled thereto. Concurrently the demodulator complexity is also scaled back. Where the XDSL protocol is digital multi-tone (DMT) the input sample size to the discrete Fourier transform (DFT) engine is reduced accordingly. With these adjustments in place TEQ resources may be scaled inversely. Thus as line length increases and the available bandwidth on the subscriber line is reduced more TEQ resources are made available to deal with the increased delay interval over which intersymbol interference is evidenced. Scaling of TEQ resources may be accomplished using a TEQ architecture which allows either the length or the tap line or the delay between taps to be varied.

摘要翻译： 本发明提供了一种用于XDSL调制解调器中时域均衡的方法和装置。 分析接收到的通信信道以确定其最高频率分量。 通常，用户线的长度与可以支持通信的最高频率分量之间存在反比关系。 响应于频率确定，信道的采样率降低到与在信道的最高频率分量上保持信号完整性一致的最低采样率。 可以在接收路径的模拟部分中实现采样率降低，例如， 模数转换器（ADC）或与之耦合的数字抽取器。 同时，解调器的复杂度也缩小了。 在XDSL协议是数字多音调（DMT）的情况下，离散傅里叶变换（DFT）引擎的输入采样大小相应减少。 通过这些调整，TEQ资源可能会相对缩小。 因此，当线路长度增加并且用户线路上的可用带宽减少时，更多的TEQ资源可用于处理增加的符号间干扰的延迟间隔。 TEQ资源的缩放可以使用允许长度或抽头线或抽头之间的延迟进行变化的TEQ架构来实现。

公开(公告)号：US07076002B1

公开(公告)日：2006-07-11

申请号：US10117823

申请日：2002-04-05

申请人： Fernando Ramirez-Mireles ,  Robert Ayrapetian ,  Dale Smith ,  Max Chien ,  Sam Heidari

发明人： Fernando Ramirez-Mireles ,  Robert Ayrapetian ,  Dale Smith ,  Max Chien ,  Sam Heidari

IPC分类号： H04L27/14 ,  H04L7/00 ,  H04J3/06 ,  H04J3/12

CPC分类号： H04L27/2662 ,  H04L27/2675

摘要： The apparatus for symbol boundary synchronization in one embodiment includes on the receive path of a multi-tone modem a window synchronizer, a converter and a symbol boundary component. The window synchronizer obtains windowed portions of the received datastream which includes symbols each expressed with a corresponding set of tones in a time domain. The windowed portions obtained in the training phase exhibit varying degrees of misalignment with the corresponding symbol boundaries. The window synchronizer is responsive to an alignment signal to obtain succeeding windowed portions of the incoming datastream aligned with the corresponding symbol boundaries therein. The converter couples to the window synchronizer to convert the set of tones from each windowed portion from the time domain to a frequency domain. The symbol boundary module couples to the converter to evaluate a phasor angle characteristic of selected tones from each windowed portion converted by the converter and to convert the phasor angle characteristic of the selected tones from a selected one of the windowed portions to the alignment signal to align the window synchronizer with the symbol boundaries in the received datastream. In an alternate embodiment of the invention the symbol boundary component couples to the window synchronizer to correlate sign values of the selected tones with a reference set and to output the alignment signal identifying the corresponding windowed portion which exhibits maximum correlation with the reference set to align the window synchronizer.

摘要翻译： 在一个实施例中，用于符号边界同步的装置在多音调制解调器的接收路径上包括窗口同步器，转换器和符号边界部件。 窗口同步器获得接收到的数据流的窗口化部分，其包括在时域中用相应的一组音调表示的符号。 在训练阶段获得的窗口部分与相应的符号边界呈现不同程度的不对准。 窗口同步器响应于对准信号以获得与其中的对应符号边界对准的输入数据流的后续窗口部分。 转换器耦合到窗口同步器，以将来自每个窗口部分的音调集从时域转换到频域。 符号边界模块耦合到转换器以评估来自由转换器转换的每个窗口部分的所选音调的相量角特性，并将所选择的音调的相量角特性从所选择的一个窗口部分转换为对准信号以对准 窗口同步器与接收到的数据流中的符号边界。 在本发明的替代实施例中，符号边界分量耦合到窗口同步器以将所选择的音调的符号值与参考集相关联，并输出识别与参考集合具有最大相关性的对应窗口部分的对准信号，以对准 窗口同步器