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Báo cáo hóa học: " Research Article Flexible Frequency-Band Reallocation Networks Using Variable Oversampled Complex-Modulated Filter Banks"

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: Research Article Flexible Frequency-Band Reallocation Networks Using Variable Oversampled Complex-Modulated Filter Banks | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2007 Article ID63714 15 pages doi 10.1155 2007 63714 Research Article Flexible Frequency-Band Reallocation Networks Using Variable Oversampled Complex-Modulated Filter Banks Hakan Johansson and Per Lowenborg Electronics Systems Department of Electrical Engineering Linkoping University 58183 Linkoping Sweden Received 22 December 2005 Revised 17 May 2006 Accepted 16 July 2006 Recommended by Soontorn Oraintara A crucial issue in the next-generation satellite-based communication systems is the satellite on-board reallocation of information which requires digital flexible frequency-band reallocation FBR networks. This paper introduces a new class of flexible FBR networks based on variable oversampled complex-modulated filter banks FBs . The new class can outperform the previously existing ones when all the aspects flexibility low complexity and inherent parallelism near-perfect frequency-band reallocation and simplicity are considered simultaneously. Copyright 2007 H. Johansson and P. Lowenborg. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION The future society foresees globally interconnected digital communication systems offering multimedia services information on demand and delivery of information data at high data rates and low cost and with high performance. Terrestrial networks could in principle meet the requirements on communication capacity due to the practically unlimited bandwidth provided by fiber optic cables but this capacity is rarely available today. A large investment is required to bridge the distance between the local exchange and the customer. It is therefore internationally recognized that satellite systems will play an important complementary role in providing the global coverage .