ABSTRACT
Contents 17.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 436 17.2 Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 437
17.2.1 Software-Defined Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 437 17.2.2 Related Work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 438 17.2.3 Spectrum Issues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 439 17.2.4 SDR Content Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 440 17.2.5 SDR Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 441 17.2.6 Missions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 441
17.3 Mission-Oriented Communications Properties . . . . . . . . . . . . . . . . . . . . 442 17.3.1 Low Probability of Detection/Low Probability
of Interference (LPD/LPI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 443 17.3.1.1 First-Order Functional Relationship . . . . . . . . . . . . 445 17.3.1.2 Second-Order Functional Relationship . . . . . . . . 445
17.3.2 Avoidance/Rejection of Nonintentional Interference . . . . 446
17.3.2.1 First-Order Functional Relationship . . . . . . . . . . . . 447 17.3.2.2 Second-Order Functional Relationship . . . . . . . . 448
17.3.3 Multipath Mitigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 448 17.3.3.1 First-Order Functional Relationship . . . . . . . . . . . . 449
17.3.4 Information Assurance/Robustness . . . . . . . . . . . . . . . . . . . . . . . 449 17.3.4.1 First-Order Functional Relationship . . . . . . . . . . . . 450 17.3.4.2 Second-Order Functional Relationship . . . . . . . . 451
17.3.5 Jamming Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 451 17.3.5.1 First-Order Functional Relationship . . . . . . . . . . . . 452
17.3.6 Communication Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 452 17.3.6.1 First-Order Functional Relationship . . . . . . . . . . . . 453 17.3.6.2 Second-Order Functional Relationship . . . . . . . . 454
17.3.7 Communication Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 454 17.3.7.1 First-Order Functional Relationship . . . . . . . . . . . . 455 17.3.7.2 Second-Order Functional Relationship . . . . . . . . 455
17.3.8 Bandwidth Efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 455 17.3.8.1 First-Order Functional Relationship . . . . . . . . . . . . 456
17.4 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 456 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 456
17.1 Introduction Within the wireless communications research and industry community over the last decade, the concept of software defined radios (SDRs) and cognitive radios have come to be considered the leading solutions to the problems of spectrum communication for the next century. SDRs incorporate the latest in hardware affordability, computational power, and signal analysis techniques into a device that provides nearly unlimited flexibility and portability. In addition, SDRs provide a unique solution to the growing spectrum usage challenge facing the wireless communications industry. Unfortunately, not many devices have been developed and made available for the mainstream that can yet fully meet all the demands and expectations the technology is reported to fulfill (Barker, 2007).
