TAILIEUCHUNG - Phần mềm xác định radio P10

Software Technology Software – at air interface, applications, protocol and network levels – is at the heart of the promise of software radio. At all levels the potential is vast and the implications are profound – the need for effective design tools to give functional reliability will be key to successful commercialization. | Software Defined Radio Edited by Walter Tuttlebee Copyright 2002 John Wiley Sons Ltd ISBNs 0-470-84318-7 Hardback 0-470-84600-3 Electronic Part IV Software Technology Software - at air interface applications protocol and network levels - is at the heart of the promise of software radio. At all levels the potential is vast and the implications are profound - the need for effective design tools to give functional reliability will be key to successful commercializ ation. Software Defined Radio Edited by Walter Tuttlebee Copyright 2002 John Wiley Sons Ltd ISBNs 0-470-84318-7 Hardback 0-470-84600-3 Electronic 10 Software Engineering for Software Radios Experiences at MIT and Vanu Inc John Chapin Vanu Inc A good software design is one of the most important aspects of a software radio. This chapter describes the software and hardware design approaches used in two software radio projects that focused on maximizing software portability modularity and adaptability. The designs described in this chapter were developed in two projects that built a series of software radios over a 6-year period. The SpectrumWare software radio project at the Massachusetts Institute of Technology in the United States ran from 1995 to 1998. In 1998 most of the SpectrumWare team left MIT to start Vanu Inc. Between 1998 and 2001 Vanu built software radio implementations of a variety of commercial and government waveforms including the cellular telephone standards IS-91 AMPS IS-136 TDMA and GSM. Although the systems developed by SpectrumWare and those developed at Vanu Inc. differ in many details the two development efforts followed the same design approach. In this chapter both systems are called Vanu systems. Vanu systems have several characteristics that distinguish them from other software radios. Most signal processing functions execute on general purpose processors rather than on digital signal processors or field programmable gate arrays. Almost all signal processing code is implemented in a

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