公开(公告)号：JP4815087B2

公开(公告)日：2011-11-16

申请号：JP2001557298

申请日：2001-02-01

Applicant: ゼネラル・エレクトリック・キャピタル・コーポレーション

Inventor： アハメド、エス．アリフ ,  キム、デ−ヨン ,  パリシスキー、ウラジミル ,  ピロッジ、ジョン ,  メウラバンザッド、セプール ,  リュウ、ジャック

IPC: H04L7/00 ,  H04L25/49

CPC classification number: H04L25/4927

公开(公告)号：JP5010084B2

公开(公告)日：2012-08-29

申请号：JP2001557182

申请日：2001-02-01

Applicant: ゼネラル・エレクトリック・キャピタル・コーポレーション

Inventor： キム、デ−ヨン ,  ピロッジ、ジョン ,  メウラバンザッド、セプール

IPC: H04L29/08 ,  H04L1/00 ,  H04L25/03 ,  H04M11/00

CPC classification number: H04L25/03343 ,  H04L1/0001 ,  H04L2025/03808

Abstract: In a full duplex PCM modem system having an analog and digital modem, a method and apparatus is provided for on-the-fly reconfiguring of analog or digital modem transmitter parameters without switching back to a retrain or startup mode. In one embodiment, the transmitter parameters for the analog modem are modified to take into account channel impairments, in which modified precompensation parameters are sent from the digital modem to the analog modem without switching out of the data mode. In another embodiment, transmit power levels sensed at the analog modem which are non-optimal are adjusted by new parameters sent from the digital modem without having to switch back to the startup mode. In a further embodiment, transmitter parameters in the digital modem are reconfigured to provide more an increased downstream data rate from the digital modem upon sensing improvement in the quality of the downstream channel without switching to the startup mode.

公开(公告)号：JP5081356B2

公开(公告)日：2012-11-28

申请号：JP2001522683

申请日：2000-08-25

Applicant: ゼネラル・エレクトリック・キャピタル・コーポレーション

Inventor： メウラバンザッド、セプール ,  キム、デ−ヨン ,  ピロッジ、ジョン

IPC: H04L29/08 ,  H04M11/00 ,  H04L5/14 ,  H04L25/49

CPC classification number: H04L5/1438 ,  H04L25/4927

公开(公告)号：JP4651259B2

公开(公告)日：2011-03-16

申请号：JP2001557203

申请日：2001-02-01

Applicant: ゼネラル・エレクトリック・キャピタル・コーポレーション

Inventor： アハメド、エス．アリフ ,  キム、デ−ヨン ,  パリシスキー、ウラジミル ,  ピロッジ、ジョン ,  マウレアー、パトリック ,  メウラバンザッド、セプール ,  リュウ、ジャック

IPC: H04B14/04 ,  H04J3/00 ,  H04J3/12 ,  H04L25/49 ,  H04M7/06

CPC classification number: H04B14/04 ,  H04J3/125 ,  H04L25/4927

Abstract: A system and method for shifting the relative phases of a PCM data frame and a network RBS frame by one or more symbols is disclosed. The method includes determining whether or not RBS is present. If RBS is present, the slots affected by RBS are identified. Next it is determined what data slots, if any, are affected by encoding. The PCM data frame is shifted so the RBS constraint and the encoding constraint do not coincide at any particular data slot. For one particular PCM upstream modulation scheme, the digital modem adjusts the relative phases of the data-mode frame and network RBS frame such that a minimum number of trellis-modified symbols fall on network RBS affected slots. This information is transmitted to an analog modem. The amount of shift can be conveyed to an analog modem in the same data sequence used to send upstream constellation sets and mapping parameters during an initial training sequence. The present invention improves the performance of any PCM modem that employs a data frame structure in which not all symbols are subject to the same constraints, for example, due to trellis coding.

公开(公告)号：JP4856343B2

公开(公告)日：2012-01-18

申请号：JP2001557180

申请日：2001-02-01

Applicant: ゼネラル・エレクトリック・キャピタル・コーポレーション

Inventor： キム、デ−ヨン ,  ピロッジ、ジョン ,  レズリー ブラウン、ウィリアム ,  メウラバンザッド、セプール

IPC: H04L25/38 ,  H04L5/16 ,  H04L7/02 ,  H04L25/49

CPC classification number: H04L7/0091 ,  H04J3/0682 ,  H04L7/0029

Abstract: In a PCM modem system, a method and apparatus for optimizing the fractional sampling phase offset in the upstream direction to maximize the upstream data rate utilizes a probing signal from the analog modem generated during startup and having at least two distinct phases of a pure tone, with the probing signal being detected at the digital modem where an optimum sampling phase value is calculated. From this calculated value, a signal representing the appropriate amount to delay the input data stream is transmitted back to the analog modem for adjustment of the fractional sampling phase so that the fractional sampling phase offset at the central office quantizer is optimized.

公开(公告)号：JP4719397B2

公开(公告)日：2011-07-06

申请号：JP2001557183

申请日：2001-02-01

Applicant: ゼネラル・エレクトリック・キャピタル・コーポレーション

Inventor： キム、デ−ヨン ,  ピロッジ、ジョン ,  メウラバンザッド、セプール

IPC: H04B3/06 ,  H04L25/03 ,  H04B3/04 ,  H04B7/005 ,  H04L25/49

CPC classification number: H04B3/04 ,  H04L25/4927 ,  H04W52/28 ,  H04W52/50

Abstract: A method and apparatus is provided for controlling the transmit power of an analog modem when the transmit power level does not match the desired transmit power level, thus conforming to FCC regulations on transmit power and/or eliminating non-linearities associated with higher than required power levels and loss of signal-to-noise ratio and concomitant at loss of data rate if the transmit power levels are less than that desired. In one embodiment, the power level at the analog modem is sensed to ascertain if it is not at the desired transmit power level, with adjustment being provided by transmitting the desired change in the transmit power level to the digital modem, whereupon mapping parameters are redefined by adjusting the number of equivalence classes, thus to adjust transmit power at analog modem.

Abstract translation: 提供了一种方法和装置，用于当发射功率电平与期望的发射功率电平不匹配时控制模拟调制解调器的发射功率，从而符合关于发射功率的FCC规定和/或消除与高于所需功率相关联的非线性 水平和信噪比的损失，如果发射功率水平低于所需的数据速率，则伴随数据速率的丢失。 在一个实施例中，感测模拟调制解调器处的功率电平以确定其是否不在期望的发射功率电平，通过将发射功率电平的期望变化发送到数字调制解调器来提供调整，由此重新定义映射参数 通过调整等价类的数量，从而调整模拟调制解调器的发射功率。