Hardik Y Gandhi

US Patent:

8306149, Nov 6, 2012

Filed:

Oct 1, 2009

Appl. No.:

12/571435

Inventors:

Fernando Alberto Mujica - Allen TX, US
Hardik Prakash Gandhi - Mountain View CA, US
Lei Ding - Plano TX, US
Milind Borkar - Dallas TX, US
Zigang Yang - Plano TX, US
Roland Sperlich - Dallas TX, US
Lars Morten Jorgensen - Royal Oaks CA, US
William L. Abbott - Portola Valley CA, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H04L 25/03
H04L 25/49

US Classification:

375296, 375297, 4551143, 708316

Abstract:

An apparatus is provided. In the apparatus, an input to index (I2I) module maps a complex input into a real signal. A real data tap delay line is coupled to the I2I module and includes N delay-elements. A complex data tap delay line is configured to receive the complex input and includes M delay elements. A set of K of non-linear function modules is also provided. Each non-linear function module from the set has at least one real input, at least one complex input, and at least one complex output. A configurable connectivity crossbar multiplexer couples K of the N real tap delay line elements to real inputs of the set non-linear functions and couples K of the M complex tap delay line elements to complex inputs of the set non-linear function modules.

US Patent:

8416893, Apr 9, 2013

Filed:

Nov 30, 2010

Appl. No.:

12/957278

Inventors:

Hardik Prakash Gandhi - Mountain View CA, US
Zigang Yang - Plano TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H04L 27/08

US Classification:

375345, 375224, 375260, 375262, 375267, 375316

Abstract:

Crest factor reduction algorithms described herein may be used to improve power amplifier efficiency during low signal power conditions compared to traditional static threshold techniques. Techniques described herein insure that the signal power level at the output of the crest fact reduction block is held constant relative to the input power level under all signal power level conditions. Two different solutions may be implemented together or separately to achieve the desired conditions. The first technique provides constant ratio between input power and output power. Constant ratio of peak and average output levels keeps the amount of crest factor reduction applied to the signal constant, irrespective of the signal power level. A second technique is to hold signal power level constant in respect to the amount of crest factor reduction applied.

US Patent:

8478210, Jul 2, 2013

Filed:

May 10, 2011

Appl. No.:

13/104578

Inventors:

Hardik P. Gandhi - Sunnyvale CA, US
Lei Ding - Plano TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H04B 1/04

US Classification:

4551143, 455 6711, 455 6713, 455 631, 4551142, 455126, 455500, 455501, 375296, 375254, 375278, 375297, 375284, 330148, 330268, 330274, 330263, 330271

Abstract:

Power amplifiers (PAs) using a Doherty or other power output level sensitive configuration have been employed for several years in telecommunications (as well as other applications) to take advantage of efficiency gains. For many of these applications, baseband signals are predistorted to compensate for nonlinearities in the PAs, but because there is a “switching event” in a Doherty-type amplifier (for example), the nonlinearities become dynamically varying. As a result, digital predistortion (DPD) becomes increasingly difficult to perform. Here, DPD modules are provided that adapt to changes in dynamically varying PAs based on a determination of the average power or other relevant metric prior to transmission.

US Patent:

20100158166, Jun 24, 2010

Filed:

Dec 23, 2008

Appl. No.:

12/342310

Inventors:

Hardik Prakash GANDHI - Mountain View CA, US

Assignee:

Texas Instruments, Inc. - Dallas TX

International Classification:

H04B 1/00
H04L 27/08

US Classification:

375345, 455 631

Abstract:

A signal processing circuit is configured to calculate a gain ratio to efficiently reduce a peak to average signal ratio for an input signal by identifying signal peaks and determining the signal peak magnitudes. A window function in combination with the gain ratio is applied to a portion of the input stream having a peak signal to create a cancellation pulse to be applied to that peak signal. The cancellation pulse phase is aligned with the signal phase, thereby causing minimal phase distortion in the resultant output signal and accurate peak cancellation. The cancellation pulse can also include a finite impulse response filter portion to efficiently handle wide bandwidth signals. The hardware may be configured to process multiple signal streams in parallel to reduce hardware requirements. An algorithm can determine the effect of multiple corrections to the input stream to avoid overcorrection in the signal processing process.

US Patent:

20120069931, Mar 22, 2012

Filed:

Sep 22, 2010

Appl. No.:

12/888191

Inventors:

Hardik P. Gandhi - Mountain View CA, US
Lei Ding - Plano TX, US
Zigang Yang - Plano TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H04L 25/49

US Classification:

375296

Abstract:

Traditionally, for multi-band communication systems, independent signal chains for each of the different bands are employed. By using such an architecture, there are a large number of components, and there is substantial power consumption. Here, transmit processor is provided that enables transmission across multiple bands using few components (namely, fewer signal chains), while also provided for digital predistortion.

US Patent:

20160065249, Mar 3, 2016

Filed:

Sep 2, 2014

Appl. No.:

14/475552

Inventors:

- Dallas TX, US
Raul Blazquez - Mountain View CA, US
Hardik Prakash Gandhi - Sunnyvale CA, US
Xiaohan Chen - Sunnyvale CA, US
Lars Jorgensen - Royal Oaks CA, US

International Classification:

H04B 1/04

Abstract:

A digital pre-distortion component includes: a first capturing component that captures a first sample set of data; a first generating component that generates a first change matrix associated with a portion of the first sample set of data; a first memory component that stores the first change matrix; a second capturing component that captures a second sample set of data; a second generating component that generates a second change matrix associated with a portion of the second sample set of data; a second memory component that stores the second change matrix; a third capturing component that captures a third sample set of data; a third generating component that generates a third change matrix associated with a portion of the third sample set of data; a comparing component that compares the third change matrix with the first change matrix to obtain a first comparison, and compares the third change matrix with the second change matrix to obtain a second comparison; and an adapting component that adapts the digital pre-distortion component with the third sample set of data based on one of the first comparison and the second comparison.

US Patent:

20160036786, Feb 4, 2016

Filed:

Aug 3, 2015

Appl. No.:

14/816067

Inventors:

HARDIK PRAKASH GANDHI - SUNNYVALE CA, US

International Classification:

H04L 29/06
H04L 29/08

Abstract:

Embodiments of the present invention disclose a method for facilitating enhanced inter-object and human-object interactivity using networked electronic devices. The method comprises providing one or more passive and active objects, generating and assigning a unique, encrypted and network-based Identification (ID) code corresponding to each of the one or more passive and active objects, custom designing a physical object Identification (ID) tag corresponding to each of the one or more passive and active objects, coupling the generated unique, encrypted and network-based Identification (ID) code with the physical object Identification (ID) tag corresponding to each of the one or more passive and active objects, retrofitting the physical object Identification (ID) tag to each of the one or more passive and active objects, providing a network for facilitating inter-object interactions and human interactions therewith, and interacting with the one or more passive and active objects retrofitted with the custom designed physical object Identification (ID) tags using one or more of at least one of portable and wearable computing and communications devices via the network, thereby facilitating realization of web of everything and anything.

US Patent:

20140169496, Jun 19, 2014

Filed:

Dec 17, 2013

Appl. No.:

14/108343

Inventors:

- Dallas TX, US
Lars Jorgensen - Royal Oaks CA, US
Hardik Gandhi - Mountain View CA, US
Lei Ding - Plano TX, US

Assignee:

TEXAS INSTRUMENTS INCORPORATED - Dallas TX

International Classification:

H04B 1/04

US Classification:

375296

Abstract:

Systems and methods for crest factor reduction (CFR) are described. A multi-band CFR architecture achieves significant hardware savings without sacrificing CFR performance by applying peak cancellation to each band individually. However, peak detection is calculated based on a combined input signal.