公开(公告)号：US06788728B1

公开(公告)日：2004-09-07

申请号：US09478265

申请日：2000-01-05

申请人： Mohit K. Prasad ,  Sam Heidari

发明人： Mohit K. Prasad ,  Sam Heidari

IPC分类号： H04B1713

CPC分类号： H04J13/10 ,  H04B2201/70706 ,  H04L27/18

摘要： A reverse link modulator modulates the incoming data sequence for the I and Q channels of a wireless device such that the resulting spreading sequence never undergoes a transition through the origin. Consequently, the modulator has a reduced peak-to-average ratio and provides an improved battery life.

摘要翻译： 反向链路调制器调制无线设备的I和Q信道的输入数据序列，使得所得到的扩展序列从不经历通过原点的转换。 因此，调制器具有降低的峰均比，并提供改善的电池寿命。

公开(公告)号：US08514917B1

公开(公告)日：2013-08-20

申请号：US12661243

申请日：2010-03-12

申请人： Sam Heidari ,  Qasem Aldrubi ,  Felipe Fuks ,  Hossein Dehghan-Fard

发明人： Sam Heidari ,  Qasem Aldrubi ,  Felipe Fuks ,  Hossein Dehghan-Fard

IPC分类号： H04L5/16

CPC分类号： H04L5/16 ,  H04B3/32 ,  H04M11/062

摘要： A digital subscriber line ‘XDSL’ communication system for provisioning multi-tone modulated communications over two subscriber lines with two modems. The first modem has shared and discrete components forming a transmit path coupled exclusively to an end of a first of the two subscriber lines and a receive path coupled exclusively to an end of a second of the two subscriber lines. The second modem also has shared and discrete components forming a transmit path and a receive path having couplings of transmit and receive path components to corresponding opposing ends of the two subscriber lines diametrically opposite to those of the first modem, whereby the modems provision the first subscriber line exclusively for unidirectional communication from the first to the second modem, and provision the second subscriber line for unidirectional communication in the opposite direction, specifically from the second modem to the first modem. A related method and modem are disclosed.

摘要翻译： 一种用于通过具有两个调制解调器的两个用户线路提供多音调调制通信的数字用户线“XDSL”通信系统。 第一调制解调器具有形成专用于两个用户线中的第一个的一端的发送路径的共享和离散组件，以及专用于两条用户线中的第二个用户线的一端的接收路径。 第二调制解调器还具有形成传输路径的共享和离散组件以及具有发射和接收路径组件的耦合的接收路径到与第一调制解调器的两个用户线的直径相反的两个用户线的对应端的接收路径，由此调制解调器提供第一订户 专用于从第一调制解调器到第二调制解调器的单向通信，并且将第二用户线路在相反方向，特别是从第二调制解调器提供给第一调制解调器的单向通信。 公开了一种相关方法和调制解调器。

公开(公告)号：US08345859B2

公开(公告)日：2013-01-01

申请号：US12009196

申请日：2008-01-16

申请人： Sam Heidari ,  Sigurd Schelstraete ,  Aner Tennen ,  Elango Pakriswamy ,  Chun-Sup Kim ,  Luiz Felipe Fuks

发明人： Sam Heidari ,  Sigurd Schelstraete ,  Aner Tennen ,  Elango Pakriswamy ,  Chun-Sup Kim ,  Luiz Felipe Fuks

IPC分类号： H04M1/00 ,  H04M9/00 ,  H04M7/00

CPC分类号： H04M11/062

摘要： A XDSL line card including an allocator for allocating power to the multi-tone modulated communications on each of the subscriber lines, and for selecting control parameters sufficient to effect communications on each of the subscriber lines at a power level proximate to an allocated power level therefore. The line card also includes configurable components coupled to one another to form a transmit path and a receive path to couple to the digital subscriber lines. The configurable components are responsive to the control parameters selected by the allocator to initialize multi-tone communications over each of the plurality of subscriber lines at a power level proximate the allocated power level.

摘要翻译： 一种XDSL线路卡，包括用于为每个用户线路上的多音调调制通信分配功率的分配器，并且用于选择足以在接近分配的功率电平的功率电平上在每个用户线上进行通信的控制参数 。 线卡还包括彼此耦合的可配置组件以形成发送路径和接收到数字用户线路的接收路径。 可配置组件响应于由分配器选择的控制参数，以在接近分配的功率电平的功率电平上初始化多个用户线中的每一个上的多音通信。

公开(公告)号：US20080069193A1

公开(公告)日：2008-03-20

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。 信道控制器，被配置为基于专用于传输鲁棒通信信道的每个音调集合中的第一音调子集，确定每个连续符号或音调集合的比特加载（...） RCC），并且基于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小于噪声余量目标的2 nd nd噪声容限目标。 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：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。

公开(公告)号：US06963603B1

公开(公告)日：2005-11-08

申请号：US09876263

申请日：2001-06-06

申请人： Behrooz Rezvani ,  Sam Heidari ,  Dale Smith

发明人： Behrooz Rezvani ,  Sam Heidari ,  Dale Smith

IPC分类号： H04B1/38 ,  H04B3/56

CPC分类号： H04B3/56 ,  H04B2203/5408 ,  H04B2203/5425 ,  H04B2203/5491 ,  H04L5/0007 ,  H04L5/0042 ,  H04L5/0044 ,  H04L5/006 ,  H04L5/008 ,  H04L25/03159 ,  H04L25/03343 ,  H04L2025/03414 ,  H04L2025/03522 ,  H04L2025/03802

摘要： An apparatus and method is provided for minimizing frequency distortion in the transmit path of an XDSL modem implementing digital multi-tone (DMT) line code. The current invention provides a means for both determining and correcting for distortion in the frequency domain. The apparatus may be incorporated in an existing X-DSL architecture without additional circuitry. In an embodiment of the invention the apparatus may include a calibration phase which may be implemented using the existing analog-to-digital (ADC) conversion and demodulation capabilities on the receive path of the modem. This calibration phase takes place before the training phase associated with establishing communications with a remote site. During the calibration phase a calibration sequence with known spectral characteristics in the frequency domain is injected digitally at the beginning of the transmit path into each of the tone bins of the inverse Fourier Transform engine (IFFT). The receive path is configured to receive feedback of a resultant analog output signal from the transmit path. A frequency analyzer is used to determine the spectral properties of the feedback from the analog output signal and a normalizer is used to compute a local gain table with gain factors for each tone bin which effect the required normalization.

摘要翻译： 提供了一种用于最小化实现数字多音（DMT）线路码的XDSL调制解调器的发送路径中的频率失真的装置和方法。 本发明提供了一种用于确定和校正频域中的失真的装置。 该装置可以并入现有的X-DSL架构中，而不需要附加的电路。 在本发明的实施例中，该装置可以包括校准阶段，其可以使用在调制解调器的接收路径上的现有模数（ADC）转换和解调能力来实现。 该校准阶段在与远程站点建立通信相关联的训练阶段之前进行。 在校准阶段期间，在频域中具有已知频谱特性的校准序列在发射路径的开始被数字地注入到逆傅里叶变换引擎（IFFT）的每个音调块中。 接收路径被配置为从发送路径接收所得到的模拟输出信号的反馈。 使用频率分析器来确定来自模拟输出信号的反馈的频谱特性，并且使用归一化器来计算具有影响所需归一化的每个音调单元的增益因子的局部增益表。

公开(公告)号：US08671128B1

公开(公告)日：2014-03-11

申请号：US11981847

申请日：2007-10-30

申请人： Hossein Dehghan ,  Karl Kowk Ho Yick ,  Sam Heidari

发明人： Hossein Dehghan ,  Karl Kowk Ho Yick ,  Sam Heidari

IPC分类号： G06F17/10 ,  H03H7/30 ,  H03H7/40 ,  H03K5/159

CPC分类号： H03H17/06 ,  H03H17/0223 ,  H03H17/0292 ,  H03H17/0294 ,  H04B1/71057

摘要： A finite impulse response filter (FIR) for processing a communication channel. The FIR comprises a delay line, a tap processor and a summer. The delay line has “N” taps to successive portions of the communication channel. The delay line shifts the successive portions of the communication channel once in each symbol processing interval. The tap processor subjects each of the “N” taps to a first scaling utilizing first scaling coefficients associated with filtering the current symbol interval and further subjects at least one of the “N” taps to a second scaling by a second scaling coefficient associated with filtering the prior symbol interval. The summer generates in each symbol interval a filtered output comprising a sum of the “N” scaled taps from the first scaling in the prior symbol interval and the second scaling of the at least one tap in the current symbol interval, thereby increasing an order of the FIR without corresponding increase in an order of the delay line.

摘要翻译： 一种用于处理通信信道的有限脉冲响应滤波器（FIR）。 FIR包括延迟线，抽头处理器和夏季。 延迟线对通信信道的连续部分具有“N”个抽头。 延迟线在每个符号处理间隔中移动通信信道的连续部分一次。 抽头处理器利用与滤波当前符号间隔相关联的第一缩放系数对“N”抽头中的每一个进行第一缩放，并且使“N”个抽头中的至少一个进行第二缩放，与通过滤波相关联的第二缩放系数 先前符号间隔。 夏天在每个符号间隔产生包括来自先前符号间隔中的第一缩放的“N”个标度的抽头和当前符号间隔中的至少一个抽头的第二缩放的滤波输出，从而增加 FIR没有相应增加延迟线的顺序。

公开(公告)号：US08432826B2

公开(公告)日：2013-04-30

申请号：US12913200

申请日：2010-10-27

申请人： Sam Heidari ,  Kapil Gulati ,  Ali Rouhi ,  Ravi Narasimhan ,  Rajkumar Samuel

发明人： Sam Heidari ,  Kapil Gulati ,  Ali Rouhi ,  Ravi Narasimhan ,  Rajkumar Samuel

IPC分类号： H04L12/28 ,  H04W4/00 ,  H04W72/00 ,  H04B7/212

CPC分类号： H04W72/085 ,  H04W36/06 ,  H04W48/16

摘要： A method and apparatus to select the best channel of a wireless network for data communication at any given time, during normal operation of the network, is described. The network may be an IEEE standard 802.11 compliant network. Channel scanning may be performed in any station on the wireless network, such as an access point (AP) or a mobile station, or both. Channel scanning may be performed during data communication idle time, or simultaneously with data communication on the network. The technique can be implemented in a multiple-input multiple-output (MIMO) communication system, where the antenna or antennas used for channel scanning can be selected dynamically during operation, to optimize one or more performance characteristics.

摘要翻译： 描述了在网络的正常操作期间在任何给定时间选择用于数据通信的无线网络的最佳信道的方法和装置。 网络可以是IEEE标准的802.11兼容网络。 频道扫描可以在诸如接入点（AP）或移动台之类的无线网络上的任何站中执行，或者两者。 信道扫描可以在数据通信空闲时间期间执行，或者与网络上的数据通信同时进行。 该技术可以在多输入多输出（MIMO）通信系统中实现，其中可以在操作期间动态地选择用于信道扫描的天线或天线，以优化一个或多个性能特征。

公开(公告)号：US20110293027A1

公开(公告)日：2011-12-01

申请号：US13120419

申请日：2009-09-23

申请人： Behrooz Rezvani ,  Farrokh R. Farrokhi ,  Sam Heidari

发明人： Behrooz Rezvani ,  Farrokh R. Farrokhi ,  Sam Heidari

IPC分类号： H04L27/28

CPC分类号： H04B7/0413

摘要： Wireless devices capable of one or more of extended multiple input multiple output (MIMO), dual bonded, and dual concurrent operation are disclosed. Methods for switching between the operational states for wireless devices capable of multiple operational states are also disclosed.

摘要翻译： 公开了能够进行扩展多输入多输出（MIMO），双重绑定和双重并发操作中的一个或多个的无线设备。 还公开了能够进行多种操作状态的无线设备的操作状态之间切换的方法。

公开(公告)号：US07359444B1

公开(公告)日：2008-04-15

申请号：US11081419

申请日：2005-03-15

申请人： Rouben Toumani ,  Sam Heidari

发明人： Rouben Toumani ,  Sam Heidari

IPC分类号： H04L27/28

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.