Gerhard G Kramer

Author:

Gerhard W. Kramer

ISBN #:

3486262351

Author:

Gerhard Kramer

ISBN #:

0821834673

Author:

Gerhard Kramer

ISBN #:

3875371585

US Patent:

20040002309, Jan 1, 2004

Filed:

Jun 26, 2002

Appl. No.:

10/180727

Inventors:

Alexei Ashikhmin - Morristown NJ, US
Gerhard Kramer - Bedminster NJ, US
Stephan Brink - Highlands NJ, US

International Classification:

H04B017/02

US Classification:

455/135000, 455/132000

Abstract:

A method and apparatus for reducing the number of erred bits in the decoded signal by using a channel decoder whose transfer characteristic is matched to the transfer characteristic of the MIMO detector. This means that the curve of the transfer characteristic of the MIMO detector is 1) above the curve of the reflected transpose of the transfer characteristic of the channel decoder for about 95% of the curve, and 2) close to the reflected transpose of the curve of the transfer characteristic of the channel decoder. Particularly, an LDPCC decoder can be used as the channel decoder and can be matched to the MIMO detector by matching 1) the transfer characteristic of the LDPCC decoder's CND to 2) the transfer characteristic of a combination of the MIMO detector and the LDPCC VND. Furthermore, the LDPCC can be similarly matched to any appropriate detector in addition to or instead of the MIMO detector. Additionally, a receiver can re-match the transfer characteristics of the detector and the channel decoder when the channel characteristics and/or SNR of the received signals change.

US Patent:

20050111564, May 26, 2005

Filed:

Nov 26, 2003

Appl. No.:

10/721100

Inventors:

Gerhard Kramer - Chatham NJ, US
Stephan Brink - Irvine CA, US

International Classification:

H04L005/12

US Classification:

375265000

Abstract:

A modulation and coding scheme for a communication system is based on use of nonsystematic repeat-accumulate codes for encoding channel information for transmission, and for employing a combined detection and decoding arrangement to decode the coded channel information. The nonsystematic repeat-accumulate codes may be generated by an encoder at a transmitter and decoded by a composite detector/decoder arrangement at a receiver.

US Patent:

20050210367, Sep 22, 2005

Filed:

Mar 17, 2004

Appl. No.:

10/802515

Inventors:

Alexei Ashikhmin - Morristown NJ, US
Gerhard Kramer - Chatham NJ, US
Stephan Brink - Irvine CA, US

Assignee:

Lucent Technologies, Inc. - Murray Hill NJ

International Classification:

H03M013/00
G06F011/00

US Classification:

714801000

Abstract:

Techniques and systems for design and use of generalized LDPC codes. A generalized LDPC code comprises a set of codewords producing valid results when submitted to a validator comprising a set of variable nodes and a set of check nodes, with outputs of the variable nodes being connected to inputs of the check nodes by interleaver edges. Each check node and variable node is in the form of a code, with the output of a node being valid if its inputs form a valid codeword. An extrinsic information transfer function (EXIT) chart is used to form a check node curve and a variable node curve is matched to the check node curve. The variable nodes are then constructed so as to provide the information transfer properties indicated by the variable node curve.

US Patent:

20070053134, Mar 8, 2007

Filed:

Sep 8, 2005

Appl. No.:

11/222476

Inventors:

Gerhard Kramer - Chatham NJ, US

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H01H 47/00

US Classification:

361160000

Abstract:

A network relay, a transmitter and methods of operating a network relay and transmitter. In one embodiment, the method of operating the network relay includes: (1) at a relay, receiving one or more symbols transmitted by a source in each of a first sequence of fundamental intervals, (2) from the relay, transmitting data extracted from the received ones of the symbols to a destination in each of a second sequence of fundamental intervals, the fundamental intervals of the first and second sequences interleaving to make a continuous period of time and (3) for each particular one of the fundamental intervals, selecting between performing the receiving and performing the transmitting based on one or more of the symbols received in an associated recent one of the fundamental intervals.

US Patent:

20070263711, Nov 15, 2007

Filed:

Apr 26, 2007

Appl. No.:

11/796366

Inventors:

Gerhard Theodor Kramer - Chatham NJ, US
Carl Nuzman - Union NJ, US
Philip Whiting - New Providence NJ, US
Miroslav Zivkovic - The Hague, NL

International Classification:

H04L 5/16

US Classification:

375222000

Abstract:

An apparatus includes a plurality of DSL modems. Each DSL modem is configured to be connected to a corresponding DSL subscriber line. A first of the DSL modems is configured to transmit a data stream to a DSL subscriber via inter-line cross-talk between the one of the DSL subscriber lines connected to the first of the DSL modems and the one of the DSL subscriber lines connected to a second of the DSL modems.

US Patent:

20070297498, Dec 27, 2007

Filed:

Jun 21, 2006

Appl. No.:

11/425608

Inventors:

Gerhard G. Kramer - Chatham NJ, US

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04B 3/36
H04L 27/00

US Classification:

375211, 375259

Abstract:

The present invention provides, in one embodiment, a method of transmitting a message. The method includes transmitting a first codeword from a transmitter to a relay. The method also includes subsequently transmitting a second codeword based on the first codeword from the relay and a third codeword from the transmitter wherein the second and third codewords are transmitted concurrently.

US Patent:

20090245081, Oct 1, 2009

Filed:

Apr 1, 2008

Appl. No.:

12/060653

Inventors:

Alexei Ashikhmin - Morristown NJ, US
Adriaan J. De Lind Van Wijngaarden - New Providence NJ, US
Gerhard Guenter Kramer - Chatham NJ, US
Carl Jeremy Nuzman - Union NJ, US
Philip Alfred Whiting - New Providence NJ, US

International Classification:

H04J 3/10

US Classification:

370201

Abstract:

At least one channel is joined to a group of active channels in a communication system by transmitting control signals to configure respective customer premises equipment (CPE) of the active channels into a joining mode of operation, and transmitting a joining signature sequence to CPE of the joining channel over a downstream data signal path of the joining channel. A central office (CO) or other access node of the system receives correlation results from respective active channel CPE, estimates crosstalk from the joining channel into the active channels based on the correlation results, configures a precoder based on the estimated crosstalk, and adds the joining channel to the group of active channels. The channels may comprise respective subscriber lines of a DSL communication system.

US Patent:

20090310502, Dec 17, 2009

Filed:

Jun 10, 2009

Appl. No.:

12/457412

Inventors:

Carl J. Nuzman - Union NJ, US
Adriaan J. de Lind van Wijngaarden - New Providence NJ, US
Philip A. Whiting - New Providence NJ, US
Jochen J. M. Maes - Veerle, BE
Gerhard G.T. Kramer - Los Angeles CA, US
Hungkei Chow - Livingston NJ, US
Alexei E. Ashikhmin - Morristown NJ, US

International Classification:

H04L 12/26

US Classification:

370252

Abstract:

The present invention relates to a crosstalk estimation device for estimating crosstalk between communication lines in a precoding group. The crosstalk estimation device comprises transmission means for transmitting a pilot sequence and reception means for receiving error feedback on one or more communication lines in the precoding group. The crosstalk estimation device further comprises crosstalk estimation means for combining the pilot sequence with the error feedback in order to obtain a crosstalk estimation between the communication lines. The device further comprises selection means for selecting a subset of one or more communication lines from the precoding group. The transmission means are adapted to transmit the pilot sequence only on the subset.