David Wayne Love

US Patent:

7023931, Apr 4, 2006

Filed:

Nov 5, 2001

Appl. No.:

10/007142

Inventors:

David Patrick Magee - Plano TX, US
Srinath Hosur - Plano TX, US
David James Love - Garland TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H04L 23/02
H04L 5/12

US Classification:

375262, 370 20, 370339, 370442, 375261, 375298, 375316, 455 60, 714786, 714794, 714795

Abstract:

Methods and systems for performing iterative soft slicing methods are disclosed. A data signal is received and processed into individual data tones. A noise estimator provides noise estimates for each data tone. A beamformer utilizes the noise estimates to provide first and second components of a constellation point estimate. A ratio of the first and second components corresponds to the constellation point estimate. A soft slicer uses outputs from the beamformer and noise estimator to determine weighted constellation points without dividing the first component by the second component.

US Patent:

7248651, Jul 24, 2007

Filed:

Aug 20, 2003

Appl. No.:

10/644546

Inventors:

David J. Love - Garland TX, US
Srinath Hosur - Plano TX, US
Anuj Batra - Dallas TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H03D 1/00
H04L 27/06

US Classification:

375341

Abstract:

A reduced search space minimum distance decoding algorithm provides average probability of error performance close to that of optimal MAP decoding. The decoding algorithm provides dramatic complexity reductions compared with MAP decoding. A sub-optimal decoder receives signal vectors y. . . y. Soft output bits are generated as is a reduced search space V via a reduced search space table creation unit in response to the soft output bits and an estimated channel H. A signal vector b is generated via a maximum likelihood decoding unit in response to the reduced search space V and the signal vectors y. . . y.

US Patent:

7257170, Aug 14, 2007

Filed:

Aug 20, 2003

Appl. No.:

10/644489

Inventors:

David J. Love - Garland TX, US
Srinath Hosur - Plano TX, US
Anuj Batra - Dallas TX, US
Tarik Muharemovic - Richardson TX, US
Eko N. Onggosanusi - Allen TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H03D 1/00
H04L 27/06

US Classification:

375340

Abstract:

A channel norm-based ordering and whitened decoding technique (lower complexity iterative decoder) for MIMO communication systems performs approximately the same level of performance as an iterative minimum mean squared error decoder. Decoding a signal vector comprises receiving a signal vector y, multiplying the received signal vector yby a conjugate transpose of a channel matrix H*. A column vector zis generated. The entries of the column vector zare reordered and an estimated channel matrix {tilde over (H)} is generated. The estimated channel matrix {tilde over (H)} decomposed using a Cholesky decomposition and generating a triangular matrix L. Triangular matrix L is solved backwards and a signal vector {tilde over (s)}estimated. An estimate of the transmitted symbol vector Ŝis generated.

US Patent:

7280622, Oct 9, 2007

Filed:

Aug 20, 2003

Appl. No.:

10/644545

Inventors:

David J. Love - Garland TX, US
Srinath Hosur - Plano TX, US
Anuj Batra - Dallas TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H03D 1/00
H04L 27/06

US Classification:

375340

Abstract:

A reduced search space minimum distance decoding method provides average probability of error performance close to optimal MAP decoding. The decoding algorithm provides dramatic complexity reductions compared with MAP decoding. A a sub-optimal decoder receives a collection of signal vectors y. . . y, with k denoting a positive integer and generates an estimated transmitted multidimensional symbol {tilde over (S)}. The estimated transmitted multidimensional symbol {tilde over (S)} is decoded using hierarchical subset decoding a subset is determined therefrom. A reduced search space V is generated and minimum distance decoding is used to decode the received symbol vectors y. . . yin the reduced search space V. one or more of the following: an estimated multidimensional symbol {tilde over (S)}, soft bit information, or hard bit information are cienerated therefrom.

US Patent:

7321644, Jan 22, 2008

Filed:

Jun 8, 2004

Appl. No.:

10/863455

Inventors:

David J. Love - Garland TX, US
Srinath Hosur - Plano TX, US
Anuj Batra - Dallas TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H03D 1/00

US Classification:

375341, 375342

Abstract:

A greater likelihood decoder, a method of deriving a reduced substreams maximum likelihood (RSML) decoded symbol vector and a multiple-input, multiple-output (MIMO) receiver incorporating the decoder or the method. In one embodiment, the decoder includes: (1) a suboptimal decoder that analyzes a received symbol vector to generate substream indicators and a decoded symbol vector estimate, (2) weakest substreams decision logic, coupled to the suboptimal decoder, that receives the substream indicators and selects weakest ones thereof and (3) subspace search logic, coupled to the suboptimal decoder and the weakest substreams decision logic, that further selects a reduced substreams maximum likelihood (RSML) decoded symbol vector from a subspace of decoded symbol vector candidates derived from the decoded symbol vector estimate and the weakest ones.

US Patent:

7848713, Dec 7, 2010

Filed:

Sep 28, 2007

Appl. No.:

11/864338

Inventors:

Jose Cabanillas - San Diego CA, US
Prasad S. Gudem - San Diego CA, US
Sai Chong Kwok - Escondido CA, US
David Love - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04B 1/46

US Classification:

455 83, 455 78, 455 82, 4552481, 343861

Abstract:

Techniques for attenuating undesired signal components from a differential duplexer are described. The duplexer provides a differential received signal at RX+ and RX− ports. This differential received signal includes an undesired common mode signal, which may come from a transmit signal. The common mode signal is attenuated with a common mode trap in an impedance matching network coupled to the RX+ and RX− ports. The matching network includes a first passive circuit coupled between the RX+ port and a first node, a second passive circuit coupled between the RX− port and a second node, and the common mode trap coupled between the first and second nodes. In one design, the common mode trap includes a first inductor coupled between the first node and a common node, a second inductor coupled between the second node and the common node, and a capacitor coupled between the common node and circuit ground.

US Patent:

20050213686, Sep 29, 2005

Filed:

Mar 26, 2004

Appl. No.:

10/810764

Inventors:

David Love - Garland TX, US
Srinath Hosur - Plano TX, US
Anuj Batra - Dallas TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H04L027/20
H03H007/30

US Classification:

375299000, 375298000

Abstract:

A waterpouring system and method for use with a multiple-input, multiple-output (MIMO) transmitter. In one embodiment, the waterpouring system includes an encoding decision subsystem that selects a constellation combination based on gains in channels of the MIMO transmitter, and a vector modulator subsystem, coupled to the encoding decision system, that modulates a fixed number of bits in a bitstream with the constellation combination to generate a symbol vector. The waterpouring system also includes a normalization and precoding subsystem, coupled to the vector modulator subsystem, that weights the symbol vector based on the gains to yield a weighted symbol vector and distributes the weighted symbol vector among the channels.

US Patent:

20140003274, Jan 2, 2014

Filed:

Mar 19, 2012

Appl. No.:

14/005456

Inventors:

Bruno Clerckx - Seoul, KR
Duck Dong Hwang - Yongin-si, KR
Chun Kin Au Yeung - San Diego CA, US
David James Love - West Lafayette IN, US
Tae Joon Kim - West Lafayette IN, US

Assignee:

Samsung Electronics Co., Ltd. - Suwon-si, Gyeonggi-do

International Classification:

H04J 11/00

US Classification:

370252

Abstract:

The present invention relates to a method and apparatus for interference alignment in a wireless communication system. A method in which a terminal aligns interferences in a wireless communication system, which includes a first base station governing a first cell and a second base station governing a second cell, comprises: a step in which the terminal measures a serving channel from the first base station which is a serving base station and an interference channel from the second base station; a step of transmitting null space information orthogonal to the interference channel to the first base station; a step of measuring channels from the first base station and the second base station to which an inference alignment plane generated based on the null space information is applied, and generating a receiving filter; and a step of transmitting, to the first base station, the interference alignment plane, the receiving filter, and effective channel measurement value based on the channel from the first base station.