            PAUL FARAGÓ 1 , LELIA FETILĂ 1 , SORIN HINTEA 1 , PETER SÖSER 2 , GABOR CSIPKES 1 , DORIS CSIPKES 1 , CALIN CIUFUDEAN 3 1 Department of Bases of Electronics Technical University of Cluj.Napoca Str. Memorandumului nr. 28, 400114, Cluj.Napoca ROMANIA 2 Institute for Electronics Graz University of Technology Inffeldgasse 12, A.8010 Graz AUSTRIA 3 ”Stefan cel Mare” University 9 University Str., Suceava, ROMANIA e.mail: Paul.FARAGO@bel.utcluj.ro , Lelia.Festila@bel.utcluj.ro, Sorin.Hintea@bel.utcluj.ro, peter.soeser@tugraz.at, gabor.csipkes@bel.utcluj.ro, doris.csipkes@bel.utcluj.ro, calin@eed.usv.ro Abstract:  Recent advances in the mobile communication industries led to the present coexistence of a variety of wireless communication standards. In this context, multi.standard radios are the solution to provide connectivity over several different radio access interfaces. One important element in such radios is the channel select filter, which is reconfigurable in order to implement a desired transfer function. This article proposes a novel filter design technique which iteratively builds the filter transfer function by the successive addition of filter singularities. Which singularity is to be added is decided by greedy search, while the position of the singularity is computed with genetic algorithm. Simulation results prove the validity of the proposed design technique, demonstrating its potential in designing cheaper filters in comparison to traditional design approaches. KeyWords:  Filter design, greedy search, evolutionary computation, genetic algorithm, adaptive filter.   Mobile communication systems were dominated in the 1990s by the TDMA/FDMA.based GSM standard. After several extensions were added to GSM, such as E.GSM, GPRS and EDGE, the mobile communication dominance was taken over in the 2000s by the CDMA.based UTMS. The motor for the development was the ever increasing need for connectivity and throughput. Thus, the emerging 4G standard targets the integration of multiple modes of wireless communications [1]: e.g. cellular communication standards (GSM, UMTS, LTE), wireless LAN (IEEE 802.11a/b/g), Bluetooth, TV broadcasting, satellite communications, etc., as well as any other standard under development now and in the future. The ultimate goal is to have connectivity “anytime, anywhere”, with multi. standard radios being an enabling factor [2]. Yet, the presence of a variety of Radio Access Interfaces makes things more difficult. The targeted frequency bands range from 400 MHz to 5 GHz, with particular specifications in terms of modulation, analog and digital signal processing and hardware requirements [3]. In this context, a framework to study mobile communication systems materialized in Software Defined Radio (SDR) platforms. The target of SDR. based radios is extended mobility, diversified services and worldwide accessibility [4, 3]. A step forward is Cognitive Radio (CR) which exhibits adaptation capabilities to radio conditions via spectrum sensing, analysis and decision [5]. This represents the cognition aspect of a CR and is usually achieved in software. Yet, in respect to hardware, a main feature is reconfigurability. A key aspect in multi.standard radio design is the choice of the receiver. Practice shows that low.IF receiver architectures are suitable for GMS and Bluetooth while zero.IF architectures work better for UMTS and WLAN radios [2]. The widely adopted solution for multi.standard receivers is a combined zero.IF/low.IF receiver architecture [1.3], Recent Advances in Signal Processing, Computational Geometry and Systems Theory ISBN: 978-1-61804-027-5 152