TAILIEUCHUNG - Phần mềm xác định radio P5

When the concepts of ‘pure’ software radio 1 were first introduced they were immediately recognizable to those who had worked on military systems at very low frequencies – at a carrier frequency of 16 kHz, A/D conversion of the RF carrier directly at the antenna was becoming feasible in the 1970s. However, only 10 years ago the prospect of ‘pure’ software radio implementations for commercial wireless systems, operating at carrier frequencies of 2 GHz and beyond, was seen as being decades away | Software Defined Radio Edited by Walter Tuttlebee Copyright 2002 John Wiley Sons Ltd ISBNs 0-470-84318-7 Hardback 0-470-84600-3 Electronic 5 Superconductor Microelectronics A Digital RF Technology for Software Radios Darren K. Brock HYPRES Inc. When the concepts of pure software radio1 were first introduced they were immediately recognizable to those who had worked on military systems at very low frequencies - at a carrier frequency of 16 kHz A D conversion of the RF carrier directly at the antenna was becoming feasible in the 1970s. However only 10 years ago the prospect of pure software radio implementations for commercial wireless systems operating at carrier frequencies of 2 GHz and beyond was seen as being decades away. Recent progress in the field of superconductor microelectronics has however been both remarkably rapid and significant such that superconducting data conversion and DSP devices capable of operation at such frequencies have now been successfully demonstrated. The commercialization of this technology promises to be a key enabler of pure software radio architectures for both commercial and military wireless systems. This chapter provides a description of the underlying technology and its potential in both commercial and defense wireless systems. The fundamentals of the technology have now been proven the pace of commercialization will depend upon investment. Introduction The speed and flexibility enabled by superconductor microelectronics seems well matched to the goals of proposed software radio architectures. For the purposes of this work we will only 1 Pure software radio as distinct from pragmatic software radio incorporates the concept of signal digitization at the antenna. Such concepts are introduced in Chapter 1 by Walter Tuttlebee in Software Defined Radio Origins Drivers and International Perspectives Tuttlebee W. Ed. John Wiley Sons Chichester 2002. Chapter 2 by Wayne Bonser in that volume also provides excellent background on the .

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