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Djordje J Tujkovic

from Los Altos, CA
Age ~51
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Related to:
Ilijana TujkovicLlijana Tujkovic
Connected to:
Jared N Tuk, 52David J Tuka, 56Laura A Tuka, 60Michael D Tuka, 40Nelson P Tukay, 58Douglas L Tuke, 72Larry Tukes, 75Leatha C Tukes, 56Linda Tukes, 55Michael H Tukes, 67

Djordje Tujkovic Phones & Addresses

  • Los Altos, CA
  • Mountain View, CA
  • Santa Clara, CA
  • Palo Alto, CA
  • Samoa, CA

Resumes

Resumes

Djordje Tujkovic Photo 1

Engineering Director

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Location:
Palo Alto, CA
Industry:
Electrical/Electronic Manufacturing
Work:
Facebook
Engineering Director
Facebook Aug 2014 - Jun 2016
Wireless System Engineer
Broadcom Nov 2010 - Aug 2014
Associate Technical Director
Beceem Communications Feb 2005 - Nov 2010
Director of Engineering
Beceem Communications Jun 2004 - Feb 2005
Consultant
Education:
Stanford University 2004 - 2005
University of Oulu 1999 - 2003
Doctorates, Doctor of Philosophy, Communications University of Belgrade 1991 - 1998
Master of Science, Masters, Telecommunications
Skills:
Lte
Wireless
Signal Processing
Digital Signal Processors
Embedded Systems
Wimax
3Gpp
Algorithms
Soc
Rf
Hspa
System Architecture
Embedded Software
Ip
Debugging
Asic
Device Drivers
Firmware
Wireless Technologies
Tcp/Ip
Wifi
Wcdma
Rtos
Djordje Tujkovic Photo 2

Djordje Tujkovic

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Publications

Us Patents

Method And System For Rate-2 Transmission

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US Patent:
7466759, Dec 16, 2008
Filed:
Jul 5, 2005
Appl. No.:
11/175430
Inventors:
Shashidhar Vummintala - Bangalore, IN
Arogyaswami Paulraj - Stanford CA, US
Erik David Lindskog - Sunnyvale CA, US
Balaji Sundar Rajan - Bangalore, IN
Djordje Tujkovic - Palo Alto CA, US
Assignee:
Beceem Communications Inc. - Santa Clara CA
International Classification:
H04B 7/02
US Classification:
375267
Abstract:
The invention relates generally to the field of signal encoding in a multiple input multiple output system in a wireless communication network. This invention specifically relates to a method of encoding and transmitting symbols in a rate-2 complex symbol per second per Hertz transmission system that achieves a maximum diversity of four for a four transmit antenna system and a diversity of three on a three transmit antenna system. The invention discloses a method of interleaving the complex symbols such that each interleaved symbol comprises information of at least two complex symbols where the complex symbols obtain values from a rotated constellation.

Method And System For Rate-2 Transmission

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US Patent:
7477698, Jan 13, 2009
Filed:
Aug 16, 2005
Appl. No.:
11/205504
Inventors:
Arogyaswami Paulraj - Santa Clara CA, US
Erik D. Lindskog - Santa Clara CA, US
Balaji S. Rajan - Santa Clara CA, US
Djordje Tujkovic - Santa Clara CA, US
Assignee:
Beceem Communications Inc. - Santa Clara CA
International Classification:
H04B 7/02
US Classification:
375267
Abstract:
Signal encoding in a multiple input multiple output system in a wireless communication network is provided. The communication system provides a method of encoding and transmitting symbols in a rate-2 complex symbol per second per Hertz transmission system that achieves a maximum diversity of four for a four transmit antenna system and a diversity of three on a three transmit antenna system. The communication system further provides a method of interleaving the complex symbols such that each interleaved symbol comprises information of at least two complex symbols where the complex symbols obtain values from a rotated constellation.

Method And System For Maximum Transmit Diversity

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US Patent:
7586997, Sep 8, 2009
Filed:
Aug 16, 2005
Appl. No.:
11/205505
Inventors:
Arogyaswami Paulraj - Santa Clara CA, US
Erik D. Lindskog - Santa Clara CA, US
Balaji S. Rajan - Santa Clara CA, US
Djordje Tujkovic - Santa Clara CA, US
Assignee:
Beceem Communications Inc. - Santa Clara CA
International Classification:
H04L 27/00
US Classification:
375299
Abstract:
A communication system is provided that includes signal encoding in a multiple input multiple output system. The communication system includes wireless communication networks. The communication system includes methods of encoding and transmitting symbols in a rate-1 complex symbol per second per Hertz transmission system while achieving maximum diversity. The communication further includes methods of interleaving the complex symbols such that each interleaved symbol comprises information of at least two complex symbols where the complex symbols obtain values from a rotated constellation.

Selecting Modulation And Coding Level And Spatial Rate For Orthogonal Frequency Domain Modulation Systems

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US Patent:
7680206, Mar 16, 2010
Filed:
Jan 31, 2007
Appl. No.:
11/701072
Inventors:
Djordje Tujkovic - Santa Clara CA, US
Erik Lindskog - Santa Clara CA, US
Vara Prasad - Santa Clara CA, US
Erik Westman - Santa Clara CA, US
Assignee:
BECEEM Communications Inc. - Santa Clara CA
International Classification:
H04B 7/02
US Classification:
375267, 375347
Abstract:
Embodiments are directed to a link adaptation method that selects the optimum transmission scheme and modulation and coding signal (MCS) level within a MIMO system, based on optimal maximum throughput on the channels. The method selects the MCS levels and spatial rate values for broadband communication systems based on the instantaneous broadband MIMO-OFDM signaling capacities. The transmission rate over the transmission channel is selected based on a comparison of the capacities achieved under diversity coding and spatial multiplexing MIMO transmission schemes. The effect of a particular receiver type or implementation can also be factored into the signaling capacity. For a fixed target probability of error, the scheme or spatial rate that has the higher instantaneous throughput is selected for transmission.

Downlink Coordinated Transmission In Ofdma Systems

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US Patent:
7706335, Apr 27, 2010
Filed:
Mar 20, 2007
Appl. No.:
11/725919
Inventors:
David Garrett - Santa Clara CA, US
Bertrand M. Hochwald - Santa Clara CA, US
Arogyaswami Paulraj - Santa Clara CA, US
Djordje Tujkovic - Santa Clara CA, US
Louay Jalloul - Santa Clara CA, US
Assignee:
BECEEM Communications Inc. - Santa Clara CA
International Classification:
H04J 3/00
US Classification:
370336, 455453, 455436, 455439, 455442, 370330, 370331, 370332, 370333, 370334, 370335, 370206, 370337, 370338, 370339, 370340, 370341, 370342, 370344, 370204, 370319, 370203
Abstract:
Embodiments described herein include methods for improving the SINR, and therefore communication quality or rate, in the downlink of a cellular communication system. In an embodiment, the system is an orthogonal-frequency-division multiple-access (OFDMA) system. In an embodiment, a set of terminals is designated a coordinated-transmission group. The set of terminal is chosen such that the slot-allocations of the set are given special treatment to alleviate interference from other sectors or cells. All terminals within a coordination group generally use the same slot, but embodiments are not so limited.

Downlink Coordinated Transmission In Ofdma Systems, Including Wimax Systems

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US Patent:
7764658, Jul 27, 2010
Filed:
Mar 20, 2007
Appl. No.:
11/725920
Inventors:
David Garrett - Santa Clara CA, US
Bertrand M. Hochwald - Santa Clara CA, US
Arogyaswami Paulraj - Santa Clara CA, US
Djordje Tujkovic - Santa Clara CA, US
Louay Jalloul - Santa Clara CA, US
Assignee:
BECEEM Communications Inc. - Santa Clara CA
International Classification:
H04J 3/00
US Classification:
370336, 455453, 455436, 455439, 455442, 370330, 370331, 370332, 370333, 370334, 370335, 370319, 370337, 370338, 370339, 370340, 370341, 370342, 370343, 370344, 370206, 370203, 370204
Abstract:
Embodiments described herein include methods for improving the SINR, and therefore communication quality or rate, in the downlink of a cellular communication system. In an embodiment, the system is an orthogonal-frequency-division multiple-access (OFDMA) system. In an embodiment, a set of terminals is designated a coordinated-transmission group. The set of terminal is chosen such that the slot-allocations of the set are given special treatment to alleviate interference from other sectors or cells. In an embodiment, “zones” defined in the WiMax standard are “repurposed” to handle the coordinated-transmission, although the zone was originally intended for another purpose.

Method Of Training A Communication System

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US Patent:
7783293, Aug 24, 2010
Filed:
Apr 26, 2007
Appl. No.:
11/796497
Inventors:
Djordje Tujkovic - Santa Clara CA, US
Louay Jalloul - Santa Clara CA, US
Sam P. Alex - Santa Clara CA, US
Javvadi Varaprasad - Santa Clara CA, US
Assignee:
BECEEM Communications Inc. - Santa Clara CA
International Classification:
H04W 72/00
H04B 1/38
H04M 1/00
H04W 4/00
US Classification:
455450, 455561, 4555621, 4554521, 370329, 370332, 370334
Abstract:
A method and system of training a communication system is disclosed. The method includes a first transceiver transmitting signals through one or more antennas of the first transceiver. A second transceiver selects a subset of a plurality of antennas of the second transceiver, wherein the selected subset provides a largest aggregate received signal power. The second transceiver transmits pilots on a subset of sub-carriers of multi-carrier signals through the selected subset of the plurality of antennas of the second transceiver. The first transceiver receives the pilots, and extracts channel knowledge from the received pilots.

Measuring Noise Power At Wireless Receivers Using Pilot Symbol Information

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US Patent:
7835432, Nov 16, 2010
Filed:
Apr 19, 2007
Appl. No.:
11/788265
Inventors:
Djordje Tujkovic - Santa Clara CA, US
Ying Xia - Santa Clara CA, US
Robert Lorenz - Santa Clara CA, US
Sriram Mudulodu - Santa Clara CA, US
Assignee:
BECEEM Communications Inc - Santa Clara CA
International Classification:
H04B 3/46
H04B 17/00
H04Q 1/20
US Classification:
375224, 370341
Abstract:
Embodiments are directed to a wireless receiver system that utilizes a special structure of pilot symbols used for synchronization and channel estimation in transmission packets to measure noise power at the receiver. The periodicity of the pilot signal sequences is used to extract the noise power from the received signal. Such extraction is achieved by subtracting the received signals from two pilot slots which are separated by the known periodicity of the training sequence. This method relies on the fact that desired signal and system interference signals will cancel out after the subtraction process. Measuring the power of the residual signal after subtraction represents the estimate of the noise power. Several consecutive such residual signals can be first summed up before measuring the power to improve the estimate of the noise power at the receiver. To further improve the performance, estimates of the desired signal produced by a channel estimation block can be first subtracted from each of the received signals on two pilot slots which are then to be subtracted and are separated by the known periodicity of the pilot sequence.
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Djordje J Tujkovic from Los Altos, CA, age ~51 Get Report