Research • Research Areas

The world today is witnessing a revolution where information holds center stage. The information context can be text, audio, or video. The mass access to, and the dissemination of critical information has revolutionized the way daily business is conducted. Three types of events are at the heart of this information revolution: data storage, data communication, and data processing.

Regardless of the type of event, however, sending and receiving the digital data over a low signal to noise ratio, a high data rate and/or a narrow-band channel presents practical problems because the signal transmitted is severely degraded due to inter-symbol interference and noise, which results in a high bit error rate. Due to these artifacts, advanced signal processing methods and coding techniques are crucial tools to reduce their effects and improve the capacity of communication systems such as ultra-wide band, CDMA, 802.11 and GSM wireless communication systems, ADSL modem, hard disk drive, CD/DVD, cable modem, cellular phone, radar, and watermarking systems, among others.

The Communication Theory and Technologies Group primarily focuses on:
­- equalization, detection, modulation coding, and synchronization for wireless communications and data storage systems
­- error correction codes such as turbo codes, low density parity check codes and iterative soft detection/timing recovery algorithms
­- Multiple Input Multiple Output Channels
­- Multi-band-OFDM based UWB PAN and Mesh Network PHY layer algorithms design
­- Spread spectrum communication
­- Smart antenna algorithm design
­- Sensor network communications and information fusion in sensor networks

Recent Projects:

Signal Processing and Coding for Wireless Mesh Networks, supported by the Scientific and Technological Research Council of Turkey (TUB

Optimum Distributed Detection Strategies for Wireless Sensor Networks with Fading Channels: Managing the Energy-Performance Tradeoff, supported by TUBITAK, 2006-2009.

Faculty: Mehmet Keskinoz

Recent/Relevant Papers:

Instantaneous BER estimation, link adaptation and scheduling in multi-band OFDM UWB WPANs, Keskinoz, M., Maflazade, E., Gurbuz, O., submitted to Wireless Personal Communications.

Proportional time sharing with frame size adaptation for MB-OFDM based UWB WPANs, Maflazade, E., Keskinoz, M., Gurbuz, O., IEEE LISAT Conference, New York, 2006.

Iterative Soft-MMSE equalization for digital non-linear pageoriented memories, Keskinoz, M., Applied Optics, (in press).

Filter bank modeling of multi-track optical tape, Keskinoz, M., IEE Electronics Letters, 41(16), 919-921, 2005.

Discrete magnitude-squared channel modeling, equalization and detection for volume holographic storage, Keskinoz, M., Kumar, B.V.K.V., Applied Optics, 43, 1368-1378, 2004.