公开(公告)号：US20140022943A1

公开(公告)日：2014-01-23

申请号：US13948444

申请日：2013-07-23

Applicant: MaxLinear, Inc.

Inventor： Curtis Ling ,  Sridhar Ramesh ,  Timothy Gallagher

IPC: H04L12/24

CPC classification number: H04L41/0823 ,  H04B17/318 ,  H04L1/0009 ,  H04L1/0026 ,  H04L12/2801 ,  H04L27/2601 ,  H04L27/2602 ,  H04L43/08 ,  H04L43/12

Abstract: A cable modem termination system (CMTS) may determine, for a plurality of cable modems served by the CMTS, a corresponding plurality of SNR-related metrics. The CMTS may assigning the modems among a plurality of service groups based on the SNR-related metrics. For any one of the modems, the CMTS may configure physical layer communication parameters to be used by the one of the modems based on a SNR-related metric of a service group to which the one of the modems is assigned. The physical layer communication parameters may include one or more of: transmit power, receive sensitivity, timeslot duration, modulation type, modulation order, forward error correction (FEC) type, and FEC code rate. The CMTS and the modems may communicate using orthogonal frequency division multiplexing (OFDM) over a plurality of subcarriers, and the physical layer communication parameters may be determined on a per-subcarrier basis.

Abstract translation: 对于由CMTS服务的多个电缆调制解调器，电缆调制解调器终端系统（CMTS）可以确定相应的多个SNR相关度量。 CMTS可以基于SNR相关度量来分配多个服务组中的调制解调器。 对于任何一个调制解调器，CMTS可以基于调制解调器之一分配到的服务组的与SNR相关的度量来配置物理层通信参数以由调制解调器之一使用。 物理层通信参数可以包括以下中的一个或多个：发射功率，接收灵敏度，时隙持续时间，调制类型，调制阶数，前向纠错（FEC）类型和FEC码率。 CMTS和调制解调器可以在多个子载波上使用正交频分复用（OFDM）进行通信，并且物理层通信参数可以在每个子载波的基础上确定。

公开(公告)号：US20140022926A1

公开(公告)日：2014-01-23

申请号：US13948401

申请日：2013-07-23

Applicant: MaxLinear, Inc.

Inventor： Curtis Ling ,  Sridhar Ramesh ,  Timothy Gallagher

IPC: H04L12/24

CPC classification number: H04L12/2801 ,  H04L1/0003 ,  H04L1/0009 ,  H04L5/001 ,  H04L5/0046 ,  H04L5/006 ,  H04L12/2898 ,  H04L27/2646 ,  H04L41/083

Abstract: A cable modem termination system (CMTS) may communicate with a plurality of cable modems using a plurality of orthogonal frequency division multiplexed (OFDM) subcarriers. The CMTS may determine a performance metric of each of the cable modems. For each of the OFDM subcarriers and each of the cable modems, the CMTS may select physical layer parameters to be used for communication with that cable modem on that OFDM subcarrier based on a performance metric of that cable modem. The parameters may be selected for each individual modem and/or each individual subcarrier, or may be selected for groups of modems and/or groups of subcarriers. The parameters may include, for example, one or more of: transmit power, receive sensitivity, timeslot duration, modulation type, modulation order, forward error correction (FEC) type, and FEC code rate.

Abstract translation: 电缆调制解调器终端系统（CMTS）可以使用多个正交频分复用（OFDM）子载波与多个电缆调制解调器进行通信。 CMTS可以确定每个有线调制解调器的性能度量。 对于每个OFDM子载波和每个电缆调制解调器，CMTS可以基于该电缆调制解调器的性能度量来选择要用于与该OFDM子载波上的该电缆调制解调器通信的物理层参数。 可以为每个单独的调制解调器和/或每个单独的子载波选择参数，或者可以针对调制解调器和/或子载波组的组选择参数。 参数可以包括例如以下中的一个或多个：发射功率，接收灵敏度，时隙持续时间，调制类型，调制阶数，前向纠错（FEC）类型和FEC码率。

公开(公告)号：US20130337740A1

公开(公告)日：2013-12-19

申请号：US13917794

申请日：2013-06-14

Applicant: MaxLinear, Inc.

Inventor： Raja Pullela ,  Glenn Chang ,  Sridhar Ramesh

IPC: H04B7/185

CPC classification number: H04B7/18513 ,  H04L7/0054 ,  H04L7/0331

Abstract: A signal processing circuit, which is within a satellite reception assembly, may be operable to analyze actual frequency information corresponding to a plurality of downconverted signals. Each of the downconverted signals may be downconverted using one or more corresponding local oscillators (LOs). Based on the analyzing, one or more of the following may be determined: one or more frequency offsets associated with the one or more corresponding LOs and one or more actual guard bands. The signal processing circuit may generate information on the determined frequency offsets and the determined actual guard bands. The signal processing circuit may perform, based on the generated information, one or both of a band stacking operation and a channel stacking operation so as to prevent channels/bands being stacked on each other or being overlapped. The signal processing circuit may perform, based on the generated information, frequency corrections for channel tuning in a gateway.

Abstract translation: 在卫星接收组件内的信号处理电路可以用于分析对应于多个下变频信号的实际频率信息。 每个下变频信号可以使用一个或多个相应的本地振荡器（LO）进行下变频。 基于分析，可以确定以下中的一个或多个：与一个或多个对应的LO和一个或多个实际保护带相关联的一个或多个频率偏移。 信号处理电路可以产生关于确定的频率偏移和所确定的实际保护频带的信息。 信号处理电路可以基于生成的信息执行频带堆叠操作和信道堆叠操作中的一个或两个，以防止信道/频带彼此堆叠或重叠。 信号处理电路可以基于生成的信息执行用于网关中的信道调谐的频率校正。