Michael E Locke

US Patent:

6598188, Jul 22, 2003

Filed:

May 10, 2000

Appl. No.:

09/569104

Inventors:

Michael Locke - Santa Clara CA
Kapil Gulati - Sunnyvale CA

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

G06F 1100

US Classification:

714704, 714759, 714779

Abstract:

Modem selection of Reed-Solomon codeword configuration to maximize error-corrected data rate given channel analysis. A lookup table of maximal codeword size given parity bytes and channel MSE allows precomputation.

US Patent:

6993099, Jan 31, 2006

Filed:

Nov 7, 2001

Appl. No.:

10/011203

Inventors:

Thomas Nicholas Zogakis - Mountain View CA, US
Michael Locke - Santa Clara CA, US
Brian Robert Wiese - San Francisco CA, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H04L 27/06

US Classification:

375340, 37524021, 375345, 375350

Abstract:

A receiver architecture featuring a decimation filter and a bypass around said decimation filter is disclosed along with a method for optimizing said receiver's sampling phase and programmable gain amplifier. Said method utilizes said receiver architecture to modify said receiver's receive path to simplify optimizations.

US Patent:

7190717, Mar 13, 2007

Filed:

Sep 22, 2005

Appl. No.:

11/233452

Inventors:

Channamallesh G. Hiremath - Plano TX, US
Udayan Dasgupta - Irving TX, US
Zigang Yang - Plano TX, US
Umashanker S. Iyer - Plano TX, US
Michael E. Locke - Santa Clara CA, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H04L 5/16

US Classification:

375222, 375316, 375341, 375365, 375260

Abstract:

A system and method for reordering tones of a DMT signal within a communication system is described. Cross tone correlated noise in a received signal is identified and rearranged such that tones with correlated noise are spread out throughout the received signal before being processed by a decoder such as, Viterbi decoder. In an embodiment, two tones with the most correlated noise are placed at each end of the sequence of tones presented to the Viterbi decoder. In some embodiment, the tones with correlated noise can be spread such that two adjacent tones with correlated noise have a minimum distance of at least three tones between them at the input to the Viterbi decoder. In other embodiment, tones in the received signal can be processed in various kinds of interleavers for reordering according to the interleaver scheme.

US Patent:

7782930, Aug 24, 2010

Filed:

Jul 20, 2007

Appl. No.:

11/781137

Inventors:

Michael E. Locke - Santa Clara CA, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H04B 1/38

US Classification:

375222

Abstract:

A digital subscriber line (DSL) system that provides fast exit from an idle state includes a central office (CO) modem for communicating with a customer premises equipment (CPE) modem. Prior to entry into a low-power or idle state for the DSL link between the CO modem and the CPE modem, seamless rate adaptation is performed in order to improve the operating margin from that used in full-on operation, for example by selecting a reduced data rate. Transmission parameters, including data rate, and bits and gains, and corresponding to the improved operating margin are stored at the modems. Upon executing short initialization to return from the idle state, the stored transmission parameters are more likely to be adequate to meet current channel conditions, so the exchange of transmission parameters during short initialization is more likely to be avoided.

US Patent:

7787558, Aug 31, 2010

Filed:

Jul 24, 2007

Appl. No.:

11/880940

Inventors:

Michael Locke - Santa Clara CA, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H04L 25/49

US Classification:

375293, 375295, 375222, 375259, 370208, 370210, 370335

Abstract:

A method of synchronizing a receiver with a transmitter. The method includes determining number of bits, j, for adjusting a bit stream, where the bit stream is generated from n tones and is dividable into codewords having a codeword length of N bytes, and the number of bits for adjusting the bit stream is determined based upon n and N. The method includes detecting a loss of synchronization indication. In response to detection of the loss of synchronization indication, the method includes adjusting the bit stream by j bits. The method includes determining whether synchronization has been regained. When synchronization has not been regained, the method includes adjusting the bit stream again by j bits. When synchronization has been regained, the method includes terminating adjustment of the bit stream.

US Patent:

7929626, Apr 19, 2011

Filed:

Jul 24, 2007

Appl. No.:

11/881137

Inventors:

Michael Locke - Santa Clara CA, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H04K 1/10
H04L 27/28

US Classification:

375260

Abstract:

A method of varying the power output of a transmitter. The method includes providing bit-loading information associated with each tone of multiple tones, where the multiple tones include a first set of tones. The method also includes producing, for transmission, on the first set of tones a first set of constellation symbols based upon the bit-loading information. The method also includes producing a second set of constellation symbols for transmission, where there is a difference of n bits between the bit size of the second bit sequence constellation symbol on each tone of the second set of tones and the bit-loading information associated with each tone of the first set of tones, and where n is an integer greater than or equal to 0.

US Patent:

20080084939, Apr 10, 2008

Filed:

Oct 6, 2006

Appl. No.:

11/539552

Inventors:

Michael Eugene Locke - Santa Clara CA, US

International Classification:

H04L 27/28

US Classification:

375260, 375E07021

Abstract:

A communication system and method for a multiple channel communication system includes separating a symbol into two or more channels; performing a transform operation on each of the channels; and timing the output of each of the transform operations to enable one or more sample buffers to receive the output of each of the channels substantially when the one or more sample buffers require the output of each of the transform operations. Another method for receiving a symbol for use in a digital subscriber line communication system includes receiving the symbol in two or more components at one or more receive buffers; and timing the output of each of the receive buffers to enable one or more receive buffers to transmit the output to each of two or more transform components substantially when the one or more receive buffers hold a multiple of a full frequency domain symbol.

US Patent:

55880452, Dec 24, 1996

Filed:

Feb 3, 1995

Appl. No.:

8/383031

Inventors:

Michael E. Locke - Santa Clara CA

Assignee:

Siemens Rdm Communications Inc. - Santa Clara CA

International Classification:

H04M 350

US Classification:

379 67

Abstract:

The reliability of call transfer in a PBX can be improved by verifying the availability of a destination port before a transfer is attempted. The incoming call is routed to an alternate line after the interrogation occurs. Once the availability of the desired facility is confirmed, the call can be picked up by the destination port.