The Joint Tactical Radio System (JTRS) is a Department of Defense (DOD) program that would play a significant role in the U.S Army's proposed Future Combat System (FCS) program. (For a more detailed description of the FCS program see CRS Report RL32888, The Army's Future Combat System(FCS): Background and Issues for Congress, by Andrew Feickert.) JTRS, envisioned as a family of software programmable radios, has been described as the "backbone" of the FCS and is intended to link the 18 manned and unmanned systems that would constitute FCS. Two JTRS sub-programs managed by the Army -- Cluster One and Cluster Five -- have experienced developmental difficulties, delays, and cost overruns which calls into question their viability. This report will be updated on a periodic basis.

The Joint Tactical Radio System (JTRS) is a Department of Defense (DoD) program that would play a significant role in the U.S. Army's proposed Future Combat System (FCS) program. JTRS, envisioned as a family of software programmable radios, has been described as the "backbone" of the FCS and is intended to link the 18 manned and unmanned systems that would constitute FCS. Two JTRS sub-programs managed by the Army -- Cluster One and Cluster Five -- have experienced developmental difficulties, delays, and cost overruns that call into question their viability. This report will be updated on a periodic basis. This report reviews the history of the JTRS procurement; current issues, including size and weight constraints and limited range, security, interoperability with legacy radio systems, Cluster One stop work order, JTRS alternatives, and Boeing's retention of Cluster One contract; experimentation and spin out one; program restructuring; program budget issues; recent Congressional actions; and issues for Congress, including the viability of the Cluster One Program, security, and JTRS alternatives. For a more detailed description of the FCS program, see CRS Report RL32888, "The Army's Future Combat System (FCS): Background and Issues for Congress," by Andrew Feickert.

This is a print on demand edition of a hard to find publication. The Future Combat System (FCS) was a multi-year, multi-billion dollar program at the heart of the Army¿s transformation efforts. It was to be the Army¿s major R&D, and acquisition program consisting of 14 manned and unmanned systems tied together by an extensive commun. and info. network. The FCS program has been characterized as a high-risk venture due to the advanced technologies involved and the challenge of networking all of the FCS subsystems together. Contents of this report: (1) Program Origins; (2) Program Overview; Current FCS Program Status; Army¿s Modernization Strategy; Budget Issues; (3) Issues for Congress: MGV Cancellation; Army Modernization Strategy and Spin Outs; Proposed Ground Combat Vehicles. Illustrations.

2011 Updated Reprint. Updated Annually. US Future Combat & Weapon Systems Handbook

The recent emergence of software-defined radio technology offers the potential to address key communications shortfalls and significantly improve military capabilities. The Joint Tactical Radio System (JTRS) program was initiated in 1997 to develop and apply this technology and to bring together separate service-led programs into a joint software-defined radio development effort. JTRS radios are intended to interoperate with existing radio systems and provide the war fighter with additional communications capability to access maps and other visual data, communicate via voice and video with other units and levels of command, and obtain information directly from battlefield sensors. As such, the JTRS program is considered a major transformational effort for the military and is expected to enable information superiority, network-centric warfare as well as modernization efforts, such as the Army's Future Combat Systems. Although total program costs have yet to be determined, the Army's effort to acquire and field close to half of the estimated 250,000 JTRS radios that are needed is expected to cost $14.4 billion. Congress asked us to review the JTRS program to determine if there are either management or technical challenges and risks that could jeopardize a successful program outcome. We found that the JTRS Program has made considerable progress to date in planning and developing key aspects of the JTRS radios. At a fundamental level, a Joint Program Office has been established to bring together the services' individual efforts to develop software-defined radios. The program office was instrumental in developing a standard software communications architecture that provides a foundation for building JTRS radios and evolving an open systems approach to facilitate technology insertion. The program office has reduced risk by employing an evolutionary acquisition strategy, whereby improved communications capabilities will be delivered in increments. However, the program still faces several managerial and technological challenges that could affect the Department of Defense's (DOD's) ability to develop and procure JTRS radios successfully. These include managing requirements and funding, maturing key technologies, integrating system components, testing, and developing secure communications. The most significant challenge we identified is the lack of a strong, joint-management structure. The current JTRS management structure is made up of a Joint Program Office, designated service-led program clusters, and other DOD organizations carrying out several related acquisition activities. The Joint Program Office is responsible for developing the communications architecture, radio waveforms, and security components, while the services are primarily responsible for developing, acquiring, and funding the actual radios. This structure, while preferable over individual service efforts, is still fragmented, making it difficult to resolve interservice differences involving requirements and funding, and hampering the production of key program documents, as in the following examples: it has been difficult to get the services to commit the funding necessary to execute the JTRS program; the program management structure has been unable to get the services to reach agreement over new and changing requirements expeditiously; and key program documents, such as the Concept of Operations and Migration Plans, have not effectively provided a joint vision for how JTRS capabilities will be developed and used. As a consequence, several program development efforts, such as handheld radios, have been delayed by more than a year. In the meantime, the Army has purchased more existing radios with fewer communications capabilities, which may further delay the delivery of JTRS capabilities to users. Technology maturity is another significant challenge facing the JTRS program. Our work on best practices has shown that programs that move to product development with immature technologies have greater difficulty meeting cost, schedule, and performance requirements than programs that mature technologies before moving into product development. The initial JTRS radio development, for helicopters and ground vehicles, was allowed to proceed into the Systems Development and Demonstration phase with technology readiness levels lower than those recommended by best practices. Further, technologies that are critical to several JTRS variants--such as miniaturized components, batteries, and multimodal antennas--are not sufficiently advanced to meet requirements and will take several more years to mature. Examples of other technological challenges include the development of complex software, the difficulty of integrating radios with host platforms, and a compressed testing schedule. In addition, developing encrypted capabilities and secure communications will be difficult because of the complex nature of the radio.

This book focuses on the multidisciplinary state-of-the-art of full-duplex wireless communications and applications. Moreover, this book contributes with an overview of the fundamentals of full-duplex communications, and introduces the most recent advances in self-interference cancellation from antenna design to digital domain. Moreover, the reader will discover analytical and empirical models to deal with residual self-interference and to assess its effects in various scenarios and applications. Therefore, this is a highly informative and carefully presented book by the leading scientists in the area, providing a comprehensive overview of full-duplex technology from the perspective of various researchers, and research groups worldwide. This book is designed for researchers and professionals working in wireless communications and engineers willing to understand the challenges and solutions full-duplex communication so to implement a full-duplex system.