Vahid Tarokh from Durham, NC, age 58

Resumes

Professor At Harvard University

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Position:

Professor at Harvard University

Location:

Greater Boston Area

Industry:

Telecommunications

Work:

Harvard University since 2002
Professor
MIT 2000 - 2002
Professor
AT&T Labs-Research Jun 1996 - Aug 2000
Director of Wireless Communications and Signal Processing Group

Education:

University of Illinois at Urbana-Champaign 1995 - 1996
Postdoctoral Fellow, Telecommunications University of Waterloo 1993 - 1995
PhD, Electrical Engineering

Skills:

Wireless
Signal Processing
Information Theory
Algorithms
Machine Learning
Image Processing
Mathematical Modeling
Statistics
Cognitive Radio
Biomedical Engineering
Medical Imaging
eHealth
Mobile Communications
Networking
Pattern Recognition
Wireless Sensor Networks
MIMO
OFDM
Sensors
Optimization

Vahid Tarokh

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Location:

Greater Boston Area

Industry:

Telecommunications

Business Records

Name / Title

Company / Classification

Phones & Addresses

Vahid Tarokh
Principal

Tarokh, Vahid
Business Services

157 Pleasant St, Cambridge, MA 02139

Vahid Tarokh
Soc signatory

SLOANE & DEVON CONSULTING, LLC

1 Irving Ter, Cambridge, MA 02138

Publications

Us Patents

Apparatus And Method For Encoding And Decoding Data Within Wireless Networks

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US Patent:

6865373, Mar 8, 2005

Filed:

May 14, 2002

Appl. No.:

10/144950

Inventors:

Wen Tong - Ottawa, CA
Vahid Tarokh - Belmont MA, US

Assignee:

Nortel Networks Limited - St. Laurent

International Classification:

H04B007/02

US Classification:

455 631, 455 59, 455101, 375267, 375265

Abstract:

The present invention is directed to apparatus and method for encoding and decoding data within a wireless network such that a MS preferably does not require multiple receivers to handle communications from BTSs with varying numbers of antennas. In embodiments of the present invention, a space-time matrix is utilized to encode the data streams being transmitted from a BTS such that a BTS with fewer antennas would simply have an encoding matrix with one or more of the columns or rows removed from the matrix. In this way, the MSs within the wireless network can be designed to decode with the use of only a single space-time encoding matrix, this space-time encoding matrix working for BTSs with various numbers of antennas.

Efficient Ofdm Communications With Interference Immunity

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US Patent:

7061854, Jun 13, 2006

Filed:

Oct 15, 2001

Appl. No.:

09/977540

Inventors:

Vahid Tarokh - Belmont MA, US
Tharmalingam Ratnarajah - Kanata, CA
Wen Tong - Ottawa, CA

Assignee:

Nortel Networks Limited - St. Laurent

International Classification:

H04J 11/00

US Classification:

370206, 370210, 375299, 375349

Abstract:

The present invention relates to employing OFDM modulation in combination with spatial diversity and space-time block coding to provide high data rates and exceptional interference immunity. For transmission, quadrature modulated data is encoded in space and time to create individual series of encoded symbols. Each of these series of encoded symbols is subjected to a type of inverse Fourier Transform in corresponding transmission paths. In each transmission path, cyclic extensions may be appended to the resultant symbols, which are subsequently converted to an analog format, modulated, amplified, and transmitted from one of multiple antennas. Preferably, such communications are implemented from base stations to mobile terminals in an environment where the frequency reuse factor is approximately one and the base stations are synchronized to a common clock signal.

Complementary Beamforming Methods And Apparatuses

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US Patent:

7099698, Aug 29, 2006

Filed:

Nov 3, 2003

Appl. No.:

10/700991

Inventors:

Vahid Tarokh - Cambridge MA, US
Siavash Alamouti - Spokane WA, US

Assignee:

Vivato, Inc. - Spokane WA

International Classification:

H04M 1/00

US Classification:

4555621, 455 634, 455 25, 4555757

Abstract:

Improved methods and apparatuses are provided to address a potential “hidden beam problem” in wireless communication systems employing smart antennas. The improved methods and apparatuses utilize complementary beamforming (CBF) techniques, such as, for example, Subspace Complementary Beamforming (SCBF), Complementary Superposition Beamforming (CSBF) and/or Single Beam Complementary Beamforming (SBCBF) techniques.

Apparatus And Method For Transmitting And Receiving Signals Using Multiple Antennas In Mobile Communication Systems

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US Patent:

7274751, Sep 25, 2007

Filed:

Sep 30, 2003

Appl. No.:

10/674735

Inventors:

Vahid Tarokh - Cambridge MA, US
Jae-Hak Chung - Seoul, KR
Chan-Soo Hwang - Yongin-shi, KR
Yung-Soo Kim - Songnam-shi, KR

Assignee:

Samsung Electronics Co., Ltd.

International Classification:

H04L 27/04
H04L 1/02

US Classification:

375299, 375347

Abstract:

According to one aspect of the present invention, there is provided a signal transmission apparatus for a mobile communication system. In the signal transmission apparatus, a frame segmentation section segments an input frame into Bbit group, where k=1,. . . , K. A first group of encoders encodes Bbit group and outputs encoded symbols. A second group of encoders encodes other B bit group and output other encoded symbols. Each encoded symbol is encoded again to the transmit antennas using different functions. A transmission section includes a plurality of antennas in groups of a predetermined number of antennas, and the total number N of antennas is larger than the sum of the number of antenna groups. The transmission antennas transmit symbols encoded by one of the encoders.

Incremental Redundancy With Space-Time Codes

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US Patent:

7397864, Jul 8, 2008

Filed:

Sep 20, 2002

Appl. No.:

10/251935

Inventors:

Vahid Tarokh - Belmont MA, US
Ming Jia - Ottawa, CA
Wen Tong - Ottawa, CA
Peiying Zhu - Kanata, CA
Jianglei Ma - Kanata, CA

Assignee:

Nortel Networks Limited - St. Laurent, Quebec

International Classification:

H04L 27/00

US Classification:

375299, 375267, 375347

Abstract:

The present invention relates to space-time coding techniques capable of providing incremental redundancy in wireless communication environments incorporating spatial and temporal diversity. In general, a transmitter sends packets, via blocks of symbols, to a receiver with high bandwidth efficiency and only in the event that the receiver does not correctly receive a data packet does the transmitter send additional symbols to assist with the decoding of the incorrectly received packet. A hybrid ARQ feedback mechanism is used such that the receiver can inform the transmitter whether the packets were correctly or incorrectly received. From the feedback, the transmitter can determine whether to send new symbols or initiate incremental redundancy. By combining the received words corresponding to the redundant symbols and those of the original packet transmission, additional diversity, coding gain, signal energy, or a combination thereof are provided to the receiver and are used to correctly decode the transmitted data.

Transmitting And Receiving Apparatus For Supporting Transmit Antenna Diversity Using Space-Time Block Code

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US Patent:

7505527, Mar 17, 2009

Filed:

Oct 9, 2003

Appl. No.:

10/681937

Inventors:

Chan-Soo Hwang - Yongin-shi, KR
Vahid Tarokh - Cambridge MA, US
Seung-Hoon Nam - Seoul, KR
Jae-Hak Chung - Seoul, KR
Yung-Soo Kim - Songnam-shi, KR

Assignee:

Samsung Electronics Co., Ltd.

International Classification:

H04B 7/02

US Classification:

375267

Abstract:

A transmitter and a receiver are disclosed herein that support transmit antenna diversity using space-time block coding in a wireless communication system. The transmitter produces symbol combinations containing, as their elements, input symbols, the inversions and conjugates of the symbols, and symbols obtained by rotating the phases of the symbols once, forms a matrix having symbols in at least two columns orthogonal to each other with the symbol combinations, and transmits the matrix. The receiver detects symbols that minimize maximum likelihood (ML) decoding metrics over all possible symbols using channel gains from transmit antennas to a receive antenna. Also, the receiver selects candidate symbols among all possible symbols according to the characteristics of transmitted modulation symbols and detects symbols that minimize the ML decoding metrics.

Differential Space-Time Block Coding Apparatus With High Transmission Rate And Method Thereof

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US Patent:

7567623, Jul 28, 2009

Filed:

Aug 18, 2005

Appl. No.:

11/206563

Inventors:

Seung-Hoon Nam - Seoul, KR
Jae-Hak Chung - Seoul, KR
Chan-Soo Hwang - Yongin-si, KR
Young-Ho Jung - Yongin-si, KR
Vahid Tarokh - Cambridge MA, US

Assignee:

Samsung Electronics Co., Ltd

International Classification:

H04L 27/00
H04K 1/02

US Classification:

375296, 375295, 375299, 375316

Abstract:

Disclosed is a differential space-time block coding apparatus with a high transmission rate in a wireless communication system employing multiple transmit antennas and a method thereof. The differential space-time block coding method includes the steps of, when elements of a transmission matrix Bare transmitted in a predetermined block (a vblock) through a predetermined transmit antenna at a predetermined time, modulating a symbol Sof inputted binary data to a symbol S, creating a matrix Sin a block (a (v+1)block) following the predetermined block by substituting the modulated symbol for the matrix P, and then, in order to perform a differential encoding function, multiplying the matrix Bby the matrix Sso as to calculate a new matrix Bto be transmitted in the (v+1)block.

Transmitter Diversity Technique For Wireless Communications

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US Patent:

7587007, Sep 8, 2009

Filed:

Oct 30, 2007

Appl. No.:

11/929090

Inventors:

Siavash Alamouti - Kirkland WA, US
Vahid Tarokh - Cambridge MA, US

Assignee:

AT&T Mobility II LLC - Atlanta GA

International Classification:

H04B 7/10
H04L 1/02

US Classification:

375347, 375259

Abstract:

A simple block coding arrangement is created with symbols transmitted over a plurality of transmit channels, in connection with coding that comprises only of simple arithmetic operations, such as negation and conjugation. The diversity created by the transmitter utilizes space diversity and either time or frequency diversity. Space diversity is effected by redundantly transmitting over a plurality of antennas, time diversity is effected by redundantly transmitting at different times, and frequency diversity is effected by redundantly transmitting at different frequencies: Illustratively, using two transmit antennas and a single receive antenna, one of the disclosed embodiments provides the same diversity gain as the maximal-ratio receiver combining (MRRC) scheme with one transmit antenna and two receive antennas. The principles of this invention are applicable to arrangements with more than two antennas, and an illustrative embodiment is disclosed using the same space block code with two transmit and two receive antennas.