公开(公告)号：US07555049B2

公开(公告)日：2009-06-30

申请号：US11220089

申请日：2005-09-06

Applicant: Murtaza Ali ,  Shahedolla Molla ,  Narasimhan Venkatraman ,  Channamallesh Hiremath ,  Umashankar S. Iyer ,  Udayan Dasgupta ,  Austin Paul Hunt ,  Dennis G. Mannering

Inventor： Murtaza Ali ,  Shahedolla Molla ,  Narasimhan Venkatraman ,  Channamallesh Hiremath ,  Umashankar S. Iyer ,  Udayan Dasgupta ,  Austin Paul Hunt ,  Dennis G. Mannering

IPC: H04K1/10 ,  H04L27/28 ,  G06F15/16

CPC classification number: H04M11/062

Abstract: A client premises digital subscriber line (DSL) modem having multi-mode capability is disclosed. In initialization, the modem estimates whether channel conditions are such that digital processing of the received data according to a lower data rate DSL standard, such as ADSL2, may result in a higher effective data rate than receipt and processing according to a higher data rate DSL standard, such as ADSL2+. If so, the DSL modem configures itself, such as by configuring its filter characteristics and sampling frequency, to receive and process data according to the lower data rate DSL standard; the transmitting modem, for example at a central office or service area interface, may continue to operate according to the higher data rate standard (with its bit loading corresponding to a subset of subchannels). The receiving DSL modem processes the payload data according to the lower standard, while processing control messages according to the higher standard.

Abstract translation: 公开了具有多模式能力的客户端数字用户线（DSL）调制解调器。 在初始化中，调制解调器估计信道条件是否使得根据诸如ADSL2的较低数据速率DSL标准的接收数据的数字处理可以导致比根据较高数据速率DSL的接收和处理更高的有效数据速率 标准，如ADSL2 +。 如果是这样，则DSL调制解调器通过配置其滤波器特性和采样频率来配置自身，以根据较低数据速率DSL标准接收和处理数据; 发射调制解调器例如在中心局或服务区接口处可以根据较高的数据速率标准（其位加载对应于子信道子集）继续运行。 接收DSL调制解调器根据较低的标准处理有效载荷数据，同时根据较高的标准处理控制消息。

公开(公告)号：US07541884B2

公开(公告)日：2009-06-02

申请号：US11932258

申请日：2007-10-31

Applicant: Mohammad A. Rahman ,  Umashankar S. Iyer

Inventor： Mohammad A. Rahman ,  Umashankar S. Iyer

IPC: H03L1/02 ,  H04B1/06 ,  H04L7/00 ,  H04L27/06

CPC classification number: H03J7/04 ,  H03J1/0008

Abstract: In at least some disclosed embodiments, a method includes receiving a burst of data out of multiple bursts of data subject to long-term frequency drift and short-term frequency drift, determining an intercept of the long-term frequency drift based on, at most, the entire burst, and compensating for the long-term drift of a subsequent burst based on the intercept. The method further includes determining a slope of the short-term frequency drift, and compensating for the short-term frequency drift of a subsequent burst based on the slope.

Abstract translation: 在至少一些所公开的实施例中，一种方法包括：接收经过长期频率漂移和短期频率漂移的数据的多个脉冲串中的数据脉冲串，至多基于最多确定长期频率漂移的截距 ，整个脉冲串，并补偿基于截距的后续脉冲串的长期漂移。 该方法还包括确定短期频率漂移的斜率，并且基于该斜率补偿随后的脉冲串的短期频率漂移。

公开(公告)号：US20080273645A1

公开(公告)日：2008-11-06

申请号：US11932258

申请日：2007-10-31

Applicant: Mohammad A. Rahman ,  Umashankar S. Iyer

Inventor： Mohammad A. Rahman ,  Umashankar S. Iyer

IPC: H04L7/00

CPC classification number: H03J7/04 ,  H03J1/0008

Abstract: In at least some disclosed embodiments, a method includes receiving a burst of data out of multiple bursts of data subject to long-term frequency drift and short-term frequency drift, determining an intercept of the long-term frequency drift based on, at most, the entire burst, and compensating for the long-term drift of a subsequent burst based on the intercept. The method further includes determining a slope of the short-term frequency drift, and compensating for the short-term frequency drift of a subsequent burst based on the slope.

Abstract translation: 在至少一些所公开的实施例中，一种方法包括：接收经过长期频率漂移和短期频率漂移的数据的多个脉冲串中的数据脉冲串，至多基于最多确定长期频率漂移的截距 ，整个脉冲串，并补偿基于截距的后续脉冲串的长期漂移。 该方法还包括确定短期频率漂移的斜率，并且基于该斜率补偿随后的脉冲串的短期频率漂移。