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Electrical and Computer Engineering
Center for Multimedia Communication
Houston Chapter IEEE Circuits and Systems Society

Speaker: Mikko Valkama
Department of Communications Engineering
Tampere University of Technology

Digitally-Assisted Transceiver Linearization

Friday, January 18, 2013
3:00 PM  to 4:00 PM

1049  George R. Brown Hall
Rice University
6100 Main St
Houston, Texas, USA

Building compact and low-cost yet flexible and reconfigurable radios for future wireless systems is generally a challenging task. On one hand, the needs for flexibility and re-configurability prevent using dedicated hardware particularly designed and optimized for only a single application or part of the radio spectrum. And on the other hand, to keep the overall size and cost of the radio equipment feasible, especially in multi-antenna multi-radio scenarios, the cost and size of individual radios are strongly limited. As a result, various imperfections and impairments are expected to take place in the used radio transceivers, especially in the radio frequency (RF) analog electronics. Good examples of such imperfections are, e.g., mirror-frequency interference due to I/Q imbalance, non-linear distortion due to mixer and amplifier nonlinearities, timing jitter and non-linearities in sampling and analog-to-digital (A/D) converter circuits, and oscillator phase noise. This talk gives some examples of recent transceiver linearization related research where digital pre-distortion and/or post-distortion are used to suppress the nonlinear distortion in radio devices, hence called digitally-assisted transceiver linearization.

Host: Joseph Cavallaro

Biography of Mikko Valkama:
Mikko Valkama was born in Pirkkala, Finland, on November 27, 1975. He received the M.Sc .and Ph.D. Degrees (both with honours) in electrical engineering (EE) from Tampere University of Technology (TUT), Finland, in 2000 and 2001, respectively. In 2002 he received the Best Ph.D. Thesis -award by the Finnish Academy of Science and Letters for his dissertation entitled ”Advanced I/Q signal processing for wideband receivers: Models and algorithms”. In 2003, he was working as a visiting researcher with the Communications Systems and Signal Processing Institute at SDSU, San Diego, CA. Currently, he is a Full Professor and Department Head at the Department of Communications Engineering at TUT, Finland. He has been involved in organizing conferences, like the IEEE SPAWC’07 (Publications Chair) held in Helsinki, Finland. His general research interests include communications signal processing, estimation and detection techniques, signal processing algorithms for software defined flexible radios, cognitive radio, digital transmission techniques such as different variants of multicarrier modulation methods and OFDM, radio localization methods, and radio resource management for ad-hoc and mobile networks.

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