Anuj P Batra

US Patent:

6917311, Jul 12, 2005

Filed:

Aug 11, 2003

Appl. No.:

10/639418

Inventors:

Srinath Hosur - Plano TX, US
Anuj Batra - Dallas TX, US
Srikanth Gummadi - Rohnert Park CA, US
David P. Magee - Plano TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H03M007/00

US Classification:

341 50, 341 51, 375347

Abstract:

For use with a multiple-input, multiple-output (MIMO) transmitter, an orthogonal preamble encoder, a method of encoding orthogonal preambles and a communication system incorporating the encoder or the method. In one embodiment, the encoder includes: (1) a preamble supplement generator configured to provide a first long sequence preamble supplement to a first transmit antenna of the MIMO transmitter and (2) a preamble supplement coordinator coupled to the preamble supplement generator and configured to provide a second long sequence preamble supplement to a second transmit antenna of the MIMO transmitter, at least a portion of the second long sequence preamble supplement being a negation of the first long sequence preamble supplement.

US Patent:

6985532, Jan 10, 2006

Filed:

Jan 2, 2003

Appl. No.:

10/335717

Inventors:

Anuj Batra - Dallas TX, US
Anand G. Dabak - Plano TX, US
Ranjit Gharpurey - Plano TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H04B 14/06

US Classification:

375245, 327103

Abstract:

System and method for analog signal generation and manipulation in an ultra-wideband (UWB) transmitter. A preferred embodiment comprises a digital portion of an UWB transmitter (for example, transmitter ), which is responsible for encoding a data stream to be transmitted, and an analog portion. The analog portion creates a stream of short duration pulses from the encoded data stream and then filters the stream of short duration pulses. To simplify the generation of the short duration pulses, a quantized representation of the short duration pulse is used. The quantized representation is created via the use of control signals that by coupling differential amplifiers together (such as amplifier ), generate a voltage drop across a resistor (such as resistor ) and hence, a current.

US Patent:

7116699, Oct 3, 2006

Filed:

Nov 2, 2001

Appl. No.:

10/003865

Inventors:

Anuj Batra - Dallas TX, US
Kofi Dankwa Anim-Appiah - Allen TX, US
Jin-Meng Ho - Plano TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H04B 1/713
H04B 1/69

US Classification:

375132, 375133, 375136

Abstract:

The invention generally provides a method of intelligent frequency hopping such as in Bluetooth and Home RF networks. The method () includes the acts of generating windows (), sampling an original frequency (), determining if the original frequency is of a desired frequency type (), using the original frequency when the original frequency is the desired frequency type (), and mapping the frequency to the desired frequency type when the original frequency is not the desired frequency type (). Accordingly, the method increases the reliability and throughput of wireless networks.

US Patent:

7184485, Feb 27, 2007

Filed:

Jul 1, 2005

Appl. No.:

11/174401

Inventors:

Jaiganesh Balakrishnan - Karnataka, IN
Anuj Batra - Dallas TX, US
Hirohisa Yamaguchi - Tsukuba, JP

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H04K 1/10

US Classification:

375260, 375295, 375219, 370208

Abstract:

A method of wirelessly communicating is disclosed. The method comprises generating a plurality of tones for a wideband orthogonal frequency division multiplex symbol (), the tones including a plurality of contiguous zero-valued tones, inverse Fourier transforming the tones to a plurality of time-domain samples (), copying a plurality of the time-domain samples as a portion of a cyclic block (), the cyclic block () contiguous with the time-domain samples (), time-domain window filtering the time-domain samples () and the cyclic block () to form a portion of the wideband orthogonal frequency division multiplex symbol (), wherein the time-domain window filter () is a function Φ(k) having the property that Φ(k)+Φ(k+N) is about equal to a constant θ where Nis the number of tones, and transmitting the wideband orthogonal frequency division multiplex symbol ().

US Patent:

7221300, May 22, 2007

Filed:

May 21, 2004

Appl. No.:

10/851365

Inventors:

Paul A. Fontaine - Plano TX, US
Ranjit Gharpurey - Ann Arbor MI, US
Anuj Batra - Dallas TX, US
Jaiganesh Balakrishnan - Dallas TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H03M 1/00

US Classification:

341136, 341141, 341142, 341144

Abstract:

A system and method implement very high data rate baseband DACs suitable for wireless applications related to new standards (e. g. Ultra-Wide Band) using CMOS processes allowing an integrated solution with the deep-submicron CMOS digital baseband. A single CMOS block working at full speed is discarded in favor of several blocks, each working at a fraction of the original data rate.

US Patent:

7236511, Jun 26, 2007

Filed:

Nov 2, 2001

Appl. No.:

10/003864

Inventors:

Anuj Batra - Dallas TX, US
Jin-Meng Ho - Plano TX, US
Kofi Dankwa Anim-Appiah - Allen TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H04B 1/00

US Classification:

375132, 375130, 375133, 375136, 375260, 375267, 375348

Abstract:

The invention generally provides a method of intelligent frequency hopping such as in Bluetooth and Home RF networks. The method () includes the acts of sampling a plurality of channels in a frequency band and identifying each channel as a good channels or a bad channel (), determining the size of a good window and the size of a bad window (), and assigning a plurality of good channels to a good window () and a plurality of bad channels to a bad window (). Accordingly, the method increases the reliability and throughput of wireless networks.

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:

7257151, Aug 14, 2007

Filed:

Dec 23, 2004

Appl. No.:

11/021609

Inventors:

Anuj Batra - Dallas TX, US
Jaiganesh Balakrishnan - Dallas TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H04B 1/00

US Classification:

375147

Abstract:

A wireless device () is provided that distinguishes between multiple piconets. The wireless device () includes a preamble component () and a correlator () component. The preamble component () provides a preamble () for a wireless fixed frequency interleaving transmission, and the correlator component () distinguishes a wireless transmission based on the preamble (). A circuit () is provided for a wireless receiver to despread a hierarchical sequence () made by spreading an M-length sequence () with an N-length sequence (). The circuit () includes a first and second despreaders (). The first despreader () is coupled to a signal input to despread a received signal. The signal is a fixed frequency interleaved transmission. The second despreader () is coupled to an output of the first despreader (). The second despreader () despreads the output of the first despreader () with a second sequence.