ELECTRICAL AND ELECTRONICS ENGINEERING


Yalçın Tanık

Picture of the person
Room No: 
D-209
Tel No: 
+90 (312) 210-2316
E-mail: 
tanik metu.edu.tr
News & Announcements: 

REGISTRATION TIMETABLE (28-30 Sep 2016)

  • 28 Wed 14:30-15:30
  • 29 Thu 14:30-15:30
  • 30 Fri 16:30-17:00

 

Research Interests: 

Communication Theory:

    • Detection and Estimation Theory,
    • Multicarrier modulation (diversity combining, synchronization, power control),
    • Pulse design for linear and nonlinear modulation systems,
    • Carrier and symbol synchronization.

 

Signal Processing Applications:

  • Radar signal processing,
  • Antenna array beam forming for interference cancellation and signal enhancement,
  • Finding direction and location of radio sources by antenna array processing,

 

Projects: 

1) A Meteorological Radar System for Zonal Precipitation Measurements:

This project was sponsored by Turkish Scientific and Technological Foundation (TÜBİTAK). It aimed the measurement of precipitation by an integrated radar and computer system. Y. Tanık participated in the project as the member responsible for the design and implementation of the interface unit between the radar and the computer. The unit performed range gate integration and digitization of the output ready to be processed by a computer. (1978-1981).

2) Design and Prototype Implementation of an LPC10 Vocoder:

The project was contracted by Military Electronics Industries Company (ASELSAN). An LPC10 vocoder satisfying the relevant NATO Stanag was designed and implemented. The system was designed based on Z80 and TMS32010 processors. Dr. Tanık worked as the project director and primary designer. (1982-1986).

3) Consultancy in ASELSAN:

Prof. Tanık has worked as a consultant in the Microwave & System Technologies (MST) division  in ASELSAN . A group of academic staff from METU which he also belongs to, has worked on several projects  in the department. He has contributed especially to electronic warfare system design, development of numerous signal processing algorithms and direction finding systems. (1984-2000).

4) Modification of an Analog Radio Link System into Digital:

The project was contracted by TELETAŞ (at present, a division of ALCATEL), one of the leading companies in telecommunication sector in Turkey, to TÜBİTAK-TAEGAE (at present, BİLTEN). The purpose was to replace baseband sections of the analog radios, which were produced under the license of ITT, by digital communication units to achieve digital transmission at 34 Mbps. Dr. Tanık worked as the primary designer of the system. He also supervised the work on the design of synchronizers, equalizers and detectors of the 4-MSK signals. (1985-1987).

5) ECCM Unit for Frequency Hopping Transceivers:

This project was contracted by ASELSAN. It aimed the design and implementation of a prototype unit to be used in conjunction with the frequency hopping VHF transceivers. Dr. Tanık worked as the project director and the primary designer. He also supervised the design of the synchronization units (1987-1988).

6) Carrier and Symbol Synchronization for HF Digital Modems:

This project was supported by the EPP group of AGARD/NATO. Dr. Tanık was the director of the project. The main goal of the project was to compare several synchronization algorithms to be used in modems operating in HF (fading, dispersive) channels. For this purpose a flexible computer simulation program was developed and it was used for performance evaluations (1989-1992).

7) Evolution of Land Mobile Radio (Including Personal) Communications (COST231):

This was an international research project with 14 European countries as participants. The project took place as a part of the COST program (Cooperation in the Fields of Science and Technology in Europe) in 1989. The aim of the project was to make research towards developing the standards for third generation mobile systems to be used primarily in Europe. The scope of the project was very broad including studies concerning propagation measurements and modeling, alternative transmission techniques, integrated data and voice communication, etc. Turkey participated in the project by signing the Memorandum of Understanding in 1990.

A team from METU worked in the project particularly dealing with the CDMA systems and channel characterization. Prof. Tanık was the director of the Turkish Team and a member of the COST231 Management Committee. (1990-1996)

8) A Prototype Millimetric Wave ESM/ECM System Design:

This project was sponsored by the Turkish Government. It aimed the design and implementation of a prototype millimetric wave ESM/ECM system. Prof. Tanık was responsible for the design of the pulse processing units and waveform generators (1990-1994).

9) Consultancy for the Development of a GSM Transceiver:

Prof. Tanık worked as a consultant to a group of engineers in ASELSAN Communication Division, who worked towards developing a GSM transceiver. Consultancy was provided on problems such as GMSK waveform synthesis, receiver synchronization, channel identification, ML detection, etc. (1993-1994).

10) Participation in the Design of Spread Spectrum System Units for a Packet Radio System:

The project was contracted by ASELSAN Communications Division. It involved participating in  the design of spread spectrum receiver units to be used in a tactical TDMA packet radio system. The work was carried by a group directed by Prof. Tanık in TÜBİTAK-BİLTEN institute (1996-1997).

11) Consultancy in the Design of an Integrated Digital Radio System:

The project was contracted by ASELSAN Communications Division. It involved participation in the design work of a voice/data radio communication system for PMR ( Private Mobile Radio ) use. The work was carried by a group directed by Prof. Tanık in TÜBİTAK-BİLTEN institute (1998).

12) Analysis and Development of Algorithms for Antenna Nulling Systems for a TDMA Packet Radio System:

The project was supported by ASELSAN Communications Division. It aimed the performance analysis and development of algorithms for antenna nulling systems for interference cancellation. The work was carried out by a group directed by Prof. Tanık, in Electrical and Electronics Engineering Department, METU (1998-2001).

13) Consultancy for the Development of an Air Defense Radar:

Prof. Tanık worked together with a group of faculty members and engineers from ASELSAN , as the coordinator of signal processing studies group, for designing an air defense radar prototype. (2003-2007).

14) Consultancy for Establishing Design Specifications for Wide-Band High-Rate Software Defined Radio:

This work was provided to ASELSAN  Communications Division to carry out feasibility studies for a new wide band software defined radio, covering modulation, coding, networking aspects etc. Prof. Tanık acted as the coordinator of a group of faculty members and as a researcher (2007-2009).

15) Waveform Design for Narrow Band Command Control Communication System:

The project was supported by ASELSAN Communications Division. It aimed a communication system design including modulation, spectrum analysis, channel characterization, synchronization, equalization, coding, and networking aspects. The work was carried out by a group directed by Prof. Tanık, in Electrical and Electronics Engineering Department, METU (2009-2011).

 

Courses / Laboratories: 

EE535 Communication Theory
Detection theory: binary M-ary hypothesis testing. Estimation theory. Representation of stochastic processes: Karhunen-Loeve expansion. Detection and estimation of signal parameters in white and colored noise. Estimation of continuous waveforms. Optimum linear realizable processor: Wiener-Hopf equation and its solution.
EE536 Digital Communication Systems
Baseband pulse transmission. Modulation of digital signals: ASK, FSK, PSK, OAM, OPSK, MSK systems. Equalizers. Carrier and bit synchronization.

EE538 Telecommunication Networks
Overview of existing analog and digital telephone networks. Review of voice digitization, digital transmission and multiplexing. Digital switching. Network synchronization. Control and management. Fundamentals of fiber optic transmission systems. Data and integrated services digital networks (ISDN). Traffic analysis.

EE637 Digital Radio Communications
Characterization of fading multipath channels. Digital signalling over frequency selective and nonselective fading channels.Diversity techniques. Coded waveforms for fading channels. Direct sequence spread spectrum signals. Frequency hopping spread spectrum signals. Synchronization of spread spectrum signals. Some applications.

EE 435 Telecommunications I

Amplitude and angle modulation techniques: Amplitude Modulation, Double Side Band, Single Side Band, Vestigial Side Band,Quadrature Amplitude Modulation, Frequency Modulation, Pulse Modulation. Phase-locked loops. Superheterodyne recievers.Frequency division multiplexing. Television. Noise in CW systems.

EE 436 Telecommunications II

Pulse modulation: Sampling process, pulse-amplitude modulation, time-division multiplexing, quantization, pulse-codemodulation. Line codes. Baseband pulse transmission. Digital passband transmission. Introduction to information theory and error control coding.

EE 430 Digital Signal Processing

Discrete-time signals and systems. Discrete Fourier transform. Sampling and reconstruction. Linear time-invariant systems. Structures for discrete-time systems. Filter design techniques. Fast Fourier Transform methods. Fourier analysis of signals using discrete Fourier transform. Optimal filtering and linear prediction.

EE 306 Signals and Systems II

Correlation of signals. Energy and power spectral densities. Hilbert transform. Principles of modulation. Stochastic processes: Characterization, correlation functions, stationarity, ergodicity, power spectral density, Transmission of random signals through linear systems. Special stochastic processes.

EE 412 Nonlinear Electronics for Communications

Nonlinear controlled sources: piecewise linear, square-law, exponential and differential pair characteristics. Low level amplitude modulation and analog multiplication. Narrowband transformer like coupling networks. Nonlinear loading of tuned circuits. Tuned large signal transistor amplifiers and frequency multipliers. Sinusoidal oscillators. Frequency mixers and converters.

EE 312 Digital Electronics

Large signal transistor models. TTL, MOS and CMOS logic gates: Inverters, input and output circuits, NAND and NOR gates; static and dynamic analyses. Regenerative circuits: Astable, monostable, bistable multivibrators and Schmitt triggers. Introduction to VLSI. Static and dynamic memories: RAM, ROM, EPROM, EEPROM, etc. A/D and D/A converters.

EE 443 Computational Methods in Electrical Engineering

Numerical errors and their estimation. Aproximation and interpolation. Roots of equations. Solutions of linear and nonlinear simultaneous equations. Numerical differentiation and integration. Solution of ordinary and partial differential equations. Introduction to statistical methods.

 

Publications: 
  • Ülkü Çilek Doyuran, Yalçın Tanık,Expectation Maximization-Based Detection in Range-Heterogeneous Weibull Clutter,” IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS,”  VOL. 50, NO. 4, pages:3156-3166, OCTOBER 2014.
  • Gökhan M. Güvensen, Yalçın Tanık, and A. Özgür Yılmaz , “A Reduced-State Ungerboeck Type MAP Receiver with Bidirectional Decision Feedback for M-ary Quasi Orthogonal Signaling,” IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 62, NO. 2,  pages:552-566, FEBRUARY 2014
  • Güvensen, Gökhan M.; Tanık, Yalçın; Yılmaz, A. Özgür, “On the Carrier Frequency Offset Estimation for Frequency Hopping Burst Mode Mobile Radio,” MILCOM Military Communications Conference”, OCT 31-NOV 03, 2010. MILITARY COMMUNICATIONS CONFERENCE, 2010 (MILCOM 2010).
  • Güvensen, Gökhan M.; Tanık, Yalçın; Yılmaz, A. Özgür, “Cut-off Rate based Outage Probability Analysis of Frequency Hopping Mobile Radio under Jamming Conditions”, OCT 31-NOV 03, 2010 MILITARY COMMUNICATIONS CONFERENCE, 2010 (MILCOM 2010) .
  • Çürük, S.M., Tanık, Y., “A Simplified MAP Channel Estimator for OFDM Systems Under Rayleigh Fading,” EUROPEAN TRANSACTIONS ON TELECOMMUNICATIONS, Volume: 21   Issue: 4   Pages: 396-405,  Jun 2010.
  • Öztan, B.B.; Tanık, Y.; “Multiple Target Doppler Estimation Under Possibly Moving Radar Clutter,” RADAR’09-IEEE Radar Conference, Bordeaux, Oct 2009.
  • Birinci T., Tanık Y., “Optimization of Nonuniform Array Geometry for DOA Estimation with the Constraint on Gross Error Probability,” Signal Processing  (Elsevier), vol. 87, No.10, pp. 2360-2369,  Oct. 2007.
  • Çürük, S.M., Tanık, Y. “Simplified MAP Estimator for OFDM Systems Under Fading,” IEEE Vehicular Technology ConferenceVTC2007-Spring, 22-25 April 2007 Pages:3165 – 3169.
  • Doyuran Ü, Ç., Tanık Y., “Detection in Range-Heterogeneous Weibull Clutter,” IEEE Radar Conference, 2007, 17-20 April 2007 Pages:343 – 347.
  • Çürük, S. M., Tanık Y, “A Novel Approach for the Design of Pulse Shaping Filters,” IEEE  Communications Letters,  Volume 10,  Issue 6,  Jun 2006, p.p.438 - 440 .
  • Doyuran E., Tanık Y.,New Pulse Shapes for CPM Signals,”VTC2006 Spring  IEEE Veh. Technol. Conf., Melbourne AustraliaMay 2006.
  • Sezginer S., Tanık Y, “An Improved Matched Filter Based Symbol Synchronizer for MSK Transmission over Fading Multipath Channels,”  IEEE Veh. Technol. Conf., 2004. VTC2004-Fall, Sept. 2004.
  • B. Canpolat, Y. Tanık, “Performance Analysis of Adaptive Loading OFDM under Rayleigh Fading,”  IEEE Transaction on  Vehicular Technol., vol.53, pp. 1105-1115 , July 2004.
  • H. Anıktar, Y.Tanık,   “ New Receiver Structures for Subcarrier Synchronization in OFDM Systems over Frequency-Selective Channels”, IEEE-ISCC2003, Antalya (Turkey), June-July 2003.
  • A. Dersan, Y. Tanık, “Passive Radar Localization by Time Difference of Arrival,”  Proc. MILCOM, Anaheim (California), Oct.2002.
  • B. Canpolat, Y. Tanık, “Performance of Adaptively Loaded OFDM under Rayleigh Fading with Diversity Combining,”  IEEE Veh. Technol. Conf. Fall, Atlantic City (New Jersey), Oct. 2001.
  • Tuncay Koç A., Şen E., Tanık Y., “Direction Finding with a Circularly Rotated Antenna,”  Proc. ICASSP '00  (IEEE Conference), June 2000.
  • A.Y. Özyıldırım, Y.Tanık, “Outage Probability Analysis of a CDMA System with Antenna Arrays in a Correlated Rayleigh Environment,” Proc. IEEE MILCOM, Atlantic City (New Jersey), Oct. 1999.
  • A.Y. Özyıldırım, Y.Tanık,  “Distribution Analysis of SIR in Antenna Arrays in a Correlated Rayleigh Environment,” Proc. IEEE GLOBECOM, Rio de Janerio, Dec. 1999.
  • A.Y. Özyıldırım, Y.Tanık, “SIR Statistics in Antenna Arrays in the Presence of Correlated Raylegh Fading,”Proc. IEEE Veh. Technol. Conf. Fall, Amsterdam, Sept. 1999.
  • A.Y. Özyıldırım, Y.Tanık, “Performance of Antenna Arrays with Joint Fading Reduction and Interference Suppression for CDMA Mobile Systems,” Proc. IEEE Veh. Technol. Conf., Houston (Texas), May 1999.
  • A.Y. Özyıldırım, Y. Tanık, “Antenna Diversity and Adaptive Beamforming for CDMA Mobile Systems,” Proc. ICT, vol. 1, pp. 91-95, Porto Carras (Greece), June 1998.
  • A. T. Koç, Y. Tanık, “Direction Finding with a Uniform Circular Array via Single Snapshot Processing,” Signal Processing (Elsevier), vol. 56, No.1, pp.17-32, Jan. 1997.
  • B. Ünal, Y. Tanık, “Code-Hopping as a New Strategy to Improve Performance of S-CDMA Cellular Systems,” GLOBECOM’96: IEEE Global Telecommunications Conference, London,UK, November 1996.