公开(公告)号：US06665355B1

公开(公告)日：2003-12-16

申请号：US09391973

申请日：1999-09-08

Applicant: Ting-Yin Chen ,  Ravi Bhaskaran ,  Christopher Keate ,  Kedar D. Shirali

Inventor： Ting-Yin Chen ,  Ravi Bhaskaran ,  Christopher Keate ,  Kedar D. Shirali

IPC: H03D124

CPC classification number: H03D1/24

Abstract: An inexpensive synchronous detection module is disclosed for a sideband signal receiver that provides for flexibility in design of the tuner. The detection module is adaptable to detection of upper or lower sideband signals. One embodiment includes an analog-to-digital converter, a Hilbert transform filter, a sideband selection switch, a complex multiplier, a carrier recovery. loop, a matched filter, and a decimator. The analog-to-digital converter oversamples an intermediate frequency (IF) signal from the tuner, and the Hilbert transform filter generates a Hilbert transform of the digital IF signal. An analytic IF signal can be generated from the digital IF signal by multiplying the Hilbert transform of the digital IF signal by j(=sqrt(−1)), and adding the resulting imaginary-valued signal to the digital IF signal. The sideband selection switch can “flip” the analytic IF signal by inverting the imaginary-valued signal. The complex multiplier multiplies the analytic IF signal by a complex-value sinusoid to shift the analytic IF signal to baseband. The resulting analytic baseband signal is match filtered and decimated to form a baseband double sideband signal with one sample per symbol period. The carrier recovery loop operates on the imaginary part of the analytic baseband signal to generate the complex sinusoid that shifts the analytic IF signal to baseband.

Abstract translation: 公开了一种边缘信号接收机的便宜的同步检测模块，其提供了调谐器设计的灵活性。 检测模块适用于检测上或下边带信号。 一个实施例包括模数转换器，希尔伯特变换滤波器，边带选择开关，复数乘法器，载波恢复。 循环，匹配滤波器和抽取器。 模数转换器从调谐器中抽取中频（IF）信号，希尔伯特变换滤波器产生数字IF信号的希尔伯特变换。 通过将数字IF信号的希尔伯特变换乘以j（= sqrt（-1）），并将产生的虚值信号与数字IF信号相加，可以从数字IF信号产生分析IF信号。 边带选择开关可以通过反相虚值信号来“翻转”分析IF信号。 复数乘法器将分析的IF信号乘以复数值正弦波，以将分析的IF信号移位到基带。 所得到的分析基带信号被匹配滤波和抽取以形成基带双边带信号，每个符号周期具有一个样本。 载波恢复循环在分析基带信号的虚部上运行，以产生将分析IF信号转换为基带的复数正弦波。

公开(公告)号：US09057508B1

公开(公告)日：2015-06-16

申请号：US14520353

申请日：2014-10-22

Applicant: Jeff Williams ,  Ravi Bhaskaran ,  Charlie Martin

Inventor： Jeff Williams ,  Ravi Bhaskaran ,  Charlie Martin

IPC: G02B27/20 ,  F21V21/08 ,  G02B5/32 ,  F21V14/02 ,  G06Q10/08 ,  F21W131/402

CPC classification number: F21V21/0832 ,  F21V14/02 ,  G02B5/32 ,  G02B27/20 ,  G06Q10/087

Abstract: Disclosed are a system, device and/or an apparatus of modular hanging lasers to enable real-time control in a distribution center. A laser assembly includes a first support member and a second support member having a curved upper hook. The laser assembly includes a printed circuit board in between the first support member and the second support member that is physically coupled with the first support member at a first rotation point of the printed circuit board and the second support member at a second rotation point of the printed circuit board. The printed circuit board has a laser whose orientation is adjustable when a protrusion of the printed circuit board extends from a curved guide of the first support member. The second support member is manually adjusted by shifting the protrusion along the curved guide based on a graduation indicator adjacent to the curved guide.

Abstract translation: 公开了一种用于在配送中心实现实时控制的模块化悬挂激光器的系统，装置和/或装置。 激光组件包括第一支撑构件和具有弯曲上钩的第二支撑构件。 激光组件包括在第一支撑构件和第二支撑构件之间的印刷电路板，其在印刷电路板的第一旋转点处与第一支撑构件物理耦合，并且第二支撑构件在第二旋转点处 印刷电路板。 印刷电路板具有当印刷电路板的突起从第一支撑构件的弯曲引导件延伸时的方向可调的激光器。 通过基于与弯曲引导件相邻的刻度指示器沿着弯曲的引导件移动突起来手动地调节第二支撑构件。

公开(公告)号：US07606188B2

公开(公告)日：2009-10-20

申请号：US11633630

申请日：2006-12-05

Applicant: Mark Dale ,  David Hartman ,  Dorothy Lin ,  Rocco Brescia ,  Alan Gin ,  Ravi Bhaskaran ,  Jen-chieh Chien ,  Adel Fanous

Inventor： Mark Dale ,  David Hartman ,  Dorothy Lin ,  Rocco Brescia ,  Alan Gin ,  Ravi Bhaskaran ,  Jen-chieh Chien ,  Adel Fanous

IPC: H04B7/212

CPC classification number: H04B7/18523

Abstract: Satellite communications are carried out using the Data Over Cable Interface Specification (DOCSIS). Satellite modems are notified of upstream channel congestion by inserting a congestion notification message in a medium access protocol (MAP) message for the upstream channel. Specifically, the congestion notification message is inserted in an unused field of the MAP message, such as the explicit congestion notification (ECN) field. The MAP message can also carry other characteristics of the upstream channel, including priority threshold, multicast access burst availability, and available bandwidth.

Abstract translation: 卫星通信使用数据通过电缆接口规范（DOCSIS）进行。 通过在上游信道的媒体接入协议（MAP）消息中插入拥塞通知消息，向卫星调制解调器通知上行信道拥塞。 具体地说，将拥塞通知消息插入MAP消息的未使用字段中，例如显式拥塞通知（ECN）字段。 MAP消息还可以携带上行信道的其他特性，包括优先权阈值，组播接入突发可用性和可用带宽。

公开(公告)号：US20090028187A1

公开(公告)日：2009-01-29

申请号：US12219504

申请日：2008-07-23

Applicant: Mark Dale ,  David L. Hartman ,  Dorothy D. Lin ,  Rocco J. Brescia, JR. ,  Alan Gin ,  Ravi Bhaskaran ,  Jen-chieh Chien ,  Adel Fanous

Inventor： Mark Dale ,  David L. Hartman ,  Dorothy D. Lin ,  Rocco J. Brescia, JR. ,  Alan Gin ,  Ravi Bhaskaran ,  Jen-chieh Chien ,  Adel Fanous

IPC: H04J3/22

CPC classification number: H04B7/18513

Abstract: A system and method for providing upstream adaptive modulation. Burst parameters associated with a range of data interval usage codes (IUCs) are defined. Each of the data IUCs has a different modulation order and forward error correction (FEC). The SNR and codeword error rate for each satellite modem in the network are monitored. The data IUCs are dynamically assigned to different satellite modems within an upstream channel based on SNR and/or codeword error rate to enable each of the satellite modems in the upstream channel to achieve maximum bandwidth efficiency during upstream data transmissions. Bandwidth requests are received from the satellite modems and granted. The grant includes the assigned data IUC. The data bursts received in the upstream channel are each processed using the parameters from the assigned IUC for each of the satellite modems sending data in the upstream channel. When any of the satellite modems' SNR and/or codeword error rate changes, the data IUC for that satellite modem is changed accordingly.

Abstract translation: 一种用于提供上行自适应调制的系统和方法。 定义与数据间隔使用代码（IUC）的范围相关联的突发参数。 每个数据IUC具有不同的调制阶数和前向纠错（FEC）。 监测网络中每个卫星调制解调器的SNR和码字错误率。 基于SNR和/或码字错误率，数据IUC被动态地分配给上游信道内的不同卫星调制解调器，以使上游信道中的每个卫星调制解调器能够在上行数据传输期间实现最大带宽效率。 带宽请求从卫星调制解调器接收并被授权。 授权包括分配的数据IUC。 在上游信道中接收的数据突发信号都使用来自所分配的IUC的参数来处理，每个卫星调制解调器在上行信道中发送数据。 当任何卫星调制解调器的SNR和/或码字错误率改变时，该卫星调制解调器的数据IUC相应地改变。

公开(公告)号：US5926489A

公开(公告)日：1999-07-20

申请号：US754875

申请日：1996-11-22

Applicant: Daniel A. Luthi ,  Ravi Bhaskaran ,  Dojun Rhee ,  Advait M. Mogre

Inventor： Daniel A. Luthi ,  Ravi Bhaskaran ,  Dojun Rhee ,  Advait M. Mogre

IPC: H03M13/00 ,  H03M13/15 ,  H03M13/27 ,  H04L1/00 ,  H04L1/20 ,  H03M13/22

CPC classification number: H04L1/0057 ,  H03M13/00 ,  H03M13/151 ,  H03M13/2703 ,  H04L1/0071

Abstract: A communications receiver system is presented for detecting burst errors and providing erasure information to a block decoder, thereby effectively doubling the conventional correction capability of the block decoder with only a minimal increase in complexity. In one embodiment, the receiver includes a demodulator which includes circuitry to detect error bursts in the received symbol sequence. Once detected, the locations of symbols in error are marked in the form of erasure flags. An error correction decoder is then able to correct up to twice as many errors with the additional information provided by the erasure flags.

Abstract translation: 提出了一种用于检测突发错误并向块解码器提供擦除信息的通信接收机系统，从而仅以最小的复杂度增加来有效地加倍了块解码器的常规校正能力。 在一个实施例中，接收机包括解调器，其包括检测接收到的符号序列中的错误突发的电路。 一旦被检测到，错误的符号的位置被标记为擦除标志的形式。 然后纠错解码器能够利用擦除标志提供的附加信息来纠正多达两倍的错误。

公开(公告)号：US08555134B2

公开(公告)日：2013-10-08

申请号：US13613328

申请日：2012-09-13

Applicant: Ravi Bhaskaran ,  Bruce J. Currivan ,  Thomas J. Kolze ,  Ba-Zhong Shen

Inventor： Ravi Bhaskaran ,  Bruce J. Currivan ,  Thomas J. Kolze ,  Ba-Zhong Shen

IPC: G06F11/00

CPC classification number: H04N21/437 ,  H03M13/29 ,  H03M13/2957 ,  H03M13/2966 ,  H03M13/6511 ,  H04L12/2801 ,  H04N7/17309

Abstract: A method of transmitting data in a cable modem system includes the steps of encoding the data using forward error correction. The data is then encoded with Turbo encoding. The data is then sent to a modulation scheme. The data is then transmitted over a cable channel. The data is then demodulated. The data is then decoded using a Turbo decoder. An inverse of the forward error correction is then applied to the data.

Abstract translation: 在电缆调制解调器系统中发送数据的方法包括使用前向纠错对数据进行编码的步骤。 然后使用Turbo编码对数据进行编码。 然后将数据发送到调制方案。 然后通过有线信道传输数据。 然后解调数据。 然后使用Turbo解码器对数据进行解码。 然后将前向纠错的逆向应用于数据。

公开(公告)号：US20110274151A1

公开(公告)日：2011-11-10

申请号：US12980137

申请日：2010-12-28

Applicant: Mark DALE ,  David L. Hartman ,  Dorothy D. Lin ,  Rocco J. Brescia, JR. ,  Alan Gin ,  Ravi Bhaskaran ,  Jen-chieh Chien ,  Adel Fanous

Inventor： Mark DALE ,  David L. Hartman ,  Dorothy D. Lin ,  Rocco J. Brescia, JR. ,  Alan Gin ,  Ravi Bhaskaran ,  Jen-chieh Chien ,  Adel Fanous

IPC: H04B17/00

CPC classification number: H04B7/18513

Abstract: A system and method for providing upstream adaptive modulation. Burst parameters associated with a range of data interval usage codes (IUCs) are defined. Each of the data IUCs has a different modulation order and forward error correction (FEC). The SNR and codeword error rate for each satellite modem in the network are monitored. The data IUCs are dynamically assigned to different satellite modems within an upstream channel based on SNR and/or codeword error rate to enable each of the satellite modems in the upstream channel to achieve maximum bandwidth efficiency during upstream data transmissions. Bandwidth requests are received from the satellite modems and granted. The grant includes the assigned data IUC. The data bursts received in the upstream channel are each processed using the parameters from the assigned IUC for each of the satellite modems sending data in the upstream channel. When any of the satellite modems' SNR and/or codeword error rate changes, the data IUC for that satellite modem is changed accordingly.

Abstract translation: 一种用于提供上行自适应调制的系统和方法。 定义与数据间隔使用代码（IUC）的范围相关联的突发参数。 每个数据IUC具有不同的调制阶数和前向纠错（FEC）。 监测网络中每个卫星调制解调器的SNR和码字错误率。 基于SNR和/或码字错误率，数据IUC被动态地分配给上游信道内的不同卫星调制解调器，以使上游信道中的每个卫星调制解调器能够在上行数据传输期间实现最大带宽效率。 带宽请求从卫星调制解调器接收并被授权。 授权包括分配的数据IUC。 在上游信道中接收的数据突发信号都使用来自所分配的IUC的参数来处理，每个卫星调制解调器在上行信道中发送数据。 当任何卫星调制解调器的SNR和/或码字错误率改变时，该卫星调制解调器的数据IUC相应地改变。

公开(公告)号：US20070147281A1

公开(公告)日：2007-06-28

申请号：US11633630

申请日：2006-12-05

Applicant: Mark Dale ,  David Hartman ,  Dorothy Lin ,  Rocco Brescia ,  Alan Gin ,  Ravi Bhaskaran ,  Jen-chieh Chien ,  Adel Fanous

Inventor： Mark Dale ,  David Hartman ,  Dorothy Lin ,  Rocco Brescia ,  Alan Gin ,  Ravi Bhaskaran ,  Jen-chieh Chien ,  Adel Fanous

IPC: H04B7/212 ,  H04L12/413

CPC classification number: H04B7/18523

Abstract: Satellite communications are carried out using the Data Over Cable Interface Specification (DOCSIS). Satellite modems are notified of upstream channel congestion by inserting a congestion notification message in a medium access protocol (MAP) message for the upstream channel. Specifically, the congestion notification message is inserted in an unused field of the MAP message, such as the explicit congestion notification (ECN) field. The MAP message can also carry other characteristics of the upstream channel, including priority threshold, multicast access burst availability, and available bandwidth.

Abstract translation: 卫星通信使用数据通过电缆接口规范（DOCSIS）进行。 通过在上游信道的媒体接入协议（MAP）消息中插入拥塞通知消息，向卫星调制解调器通知上行信道拥塞。 具体地说，将拥塞通知消息插入MAP消息的未使用字段中，例如显式拥塞通知（ECN）字段。 MAP消息还可以携带上行信道的其他特性，包括优先权阈值，组播接入突发可用性和可用带宽。

公开(公告)号：US07145888B2

公开(公告)日：2006-12-05

申请号：US10420909

申请日：2003-04-23

Applicant: Mark Dale ,  David Hartman ,  Dorothy Lin ,  Rocco Brescia ,  Alan Gin ,  Ravi Bhaskaran ,  Jen-chieh Chien ,  Adel Fanous

Inventor： Mark Dale ,  David Hartman ,  Dorothy Lin ,  Rocco Brescia ,  Alan Gin ,  Ravi Bhaskaran ,  Jen-chieh Chien ,  Adel Fanous

IPC: H04B7/212

CPC classification number: H04B7/18523

Abstract: Satellite communications are carried out using the Data Over Cable Interface Specification (DOCSIS). Satellite modems are notified of upstream channel congestion by inserting a congestion notification message in a medium access protocol (MAP) message for the upstream channel. Specifically, the congestion notification message is inserted in an unused field of the MAP message, such as the explicit congestion notification (ECN) field. The MAP message can also carry other characteristics of the upstream channel, including priority threshold, multicast access burst availability, and available bandwidth.

公开(公告)号：US06549591B1

公开(公告)日：2003-04-15

申请号：US09712403

申请日：2000-11-13

Applicant: Christopher Keate ,  Ravi Bhaskaran ,  Dariush Dabiri

Inventor： Christopher Keate ,  Ravi Bhaskaran ,  Dariush Dabiri

IPC: H04L2508

CPC classification number: H04B1/123

Abstract: Digital interference rejection of a signal is accomplished by first converting the signal to digital. Then a second signal is generated and mixed with the first signal. This combined signal is then filtered. The signal can then be scaled as needed, resulting in a finely tuned, interference free signal.

Abstract translation: 信号的数字干扰抑制是通过首先将信号转换为数字来实现的。 然后产生第二信号并与第一信号混合。 然后对该组合信号进行滤波。 然后可以根据需要对信号进行缩放，从而产生微调，无干扰的信号。