athiou, and T. 10. B. Brannon and C. Cloninger, Gratzek, "A Look at Software Radios: "Redefining the Role of ADCs in 16. Specifications. Available at: http:// Are They Fact or Fiction?" Electronic Wireless," Applied Microwave and www.3gpp2.org. Design (December 1998): 117-22. Wireless 13 (March 2001): 94-105. 17. R.H. Walden, "Analog-to-Digital 4. B. Clarke and K. Kreitzer, "Software 11. B. Brannon, "DNL and Some of Its Converter Survey and Analysis," IEEE Radio Concepts," unpublished paper. Effects on Converter Performance," Communications Magazine 17 (April 5. B. Brannon, "Digital-Radio-Receiver Wireless Design and Development 9 1999): 539-50. Design Requires Reevaluation of (June 2001): 10. 18. H. Nyquist, "Certain Topics in Parameters," EDN 43 (November 12. B. Brannon, "Overcoming Converter Telegraph Transmission Theory," AIEE 1998): 163-70. Nonlinearies with Dither," Analog Transactions 47 (April 1928): 6. B. Brannon, "New A/D Converter Devices Applications Note AN-410, 617-44. Benefits Digital IFs," RF Design 18 www.analog.com. 19. AD6645 Datasheet. Available at: (May 1995): 50-65. 13. W. Kester, "High-Speed Sampling and http://www.analog.com. 7. W.H. Hayward, "Introduction to Radio High-Speed ADCs," Section 4, High- Frequency Design," The American Speed Design Techniques, www.analog. Radio Relay League, 1994-1996. Chapter 2.4a The software defined radio as a platform for cognitive radio Pablo Robert and Bruce Fette 2.4a.1 Introduction knowledge. With this hardware-specific knowledge, the cognitive engine can then navigate the different optimi- This chapter explores both the hardware and software zation strategies that it is programmed to traverse. The domains of software defined radio (SDR). The span of problem with such knowledge is that a change in the information covered is necessarily broad; therefore, it underlying hardware would require a change in the cog- focuses on some aspects of hardware and software that are nitive engine's knowledge base. This problem becomes especially relevant to SDR design.