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This book discusses spectrum sharing between cellular systems and radars. The book addresses a novel way to design radar waveforms that can enable spectrum sharing between radars and communication systems, without causing interference to communication systems, and at the same time achieving radar objectives of target detection, estimation, and tracking. The book includes a MATLAB-based approach, which provides reader with a way to learn, experiment, compare, and build on top of existing algorithms.
Recent years have seen tremendous growth in use of radio frequency spectrumespecially by commercial cellular operators. Ubiquitous use of smartphones andtablets is one of the reasons behind an all-time high utilization of spectrum. As aresult, cellular operators are experiencing a shortage of radio spectrum to meetbandwidth demands of users. On the other hand, spectrum measurements haveshown that much spectrum not held by cellular operators is underutilized even indense urban areas. This has motivated shared access to spectrum by secondarysystems with no or minimal impact to incumbent systems. Spectrum sharing is apromising approach to solve the problem of spectrum congestion as it allows cellularoperators access to more spectrum in order to satisfy the ever-growing bandwidthdemands of commercial users. The US spectrum regulatory bodies, the FederalCommunications Commission (FCC) and the National Telecommunications andInformation Administration (NTIA), are working on an initiative to share 150 MHzof spectrum, held by federal agencies, in the band 3550–3700 MHz with commercialwireless operators. This band is primarily used by the Department of Defense for air,ground, and shipborne radar systems that are critical to national defense.Radars operating in this band are a major source of interference to communicationsystems. However, radar waveform can be transformed in such a way that itdoes not interfere with communication systems. This is accomplished by projectingthe radar signal onto the null space of the wireless channel between radar andcommunication system. This book discusses two different types of radar waveformsthat are designed specifically for congested RF spectrum environments, thus,enabling simultaneous operation of radar and communication systems.
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