tailieunhanh - Báo cáo hóa học: " Flexible Analog Front Ends of Reconfigurable Radios Based on Sampling and Reconstruction with Internal Filtering"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Flexible Analog Front Ends of Reconfigurable Radios Based on Sampling and Reconstruction with Internal Filtering | EURASIP Journal on Wireless Communications and Networking 2005 3 364-381 2005 Y. S. Poberezhskiy and G. Y. Poberezhskiy Flexible Analog Front Ends of Reconfigurable Radios Based on Sampling and Reconstruction with Internal Filtering Yefim S. Poberezhskiy Rockwell Scientific Company Thousand Oaks CA 91360 USA Email ypoberezhskiy@ Gennady Y. Poberezhskiy Raytheon Company El Segundo CA 90245 USA Email gennady@ Received 27 September 2004 Revised 4 April 2005 Bandpass sampling reconstruction and antialiasing filtering in analog front ends potentially provide the best performance of software defined radios. However conventional techniques used for these procedures limit reconfigurability and adaptivity of the radios complicate integrated circuit implementation and preclude achieving potential performance. Novel sampling and reconstruction techniques with internal filtering eliminate these drawbacks and provide many additional advantages. Several ways to overcome the challenges of practical realization and implementation of these techniques are proposed and analyzed. The impact of sampling and reconstruction with internal filtering on the analog front end architectures and capabilities of software defined radios is discussed. Keywords and phrases software defined radios reconfigurable and adaptive transceivers sampling analog signal reconstruction antialiasing filtering A D. 1. INTRODUCTION Next generation of software defined radios SDRs should be reconfigurable to support future wireless systems operating with different existing and evolving communication standards while providing a wide variety of services over various networks. These SDRs should also be extremely adaptive to achieve high performance in dynamic communication environment and to accommodate varying user needs. Modern radios virtually all of which are digital do not meet these requirements. They contain large analog front ends that is their analog and mixed-signal portions AMPs 1 2 3 4