prof. Joseph Mitola III, Tekn. Dr. School of Engineering and Science School of Systems and Enterprises Vice President for the Research Enterprise Stevens Institute of Technology Castle Point on Hudson, NJ e-mail: Joe.Mitola (at) stevens.edu (address as of Fall 2008) area: Cognitive Radio (the integration of software radio and machine intelligence)
Doctoral Student at CCSLab (Doctoral defense completed successfully on 8 June 00).
I'm a consulting scientist with the MITRE Corporation, a not-for-profit company chartered in the public intetest that operates Federally Funded Research and Development Centers for the US Government. Previously, I have been a program manager at the US Defense Advanced Research Projects Agency, and chief scientist of electronic systems at E-systems. Earlier in my career, I held technical director positions at Harris Corp and Advanced Decision Systems, a small artificial intelligence company where I learned both how to write good expert systems for signal processing, and to hate the knowledge engineering bottleneck imposed by this technology. So my research in cognitive radio focuses on integrating machine learning into software-defined radio.
Not being able to hold a job for long, I also worked for ITT Corp and the US DoD earlier in my career. I'm kind of an old guy. I learned to program on an IBM 1620 in FORTRAN in 1964, in machine language (1's and 0's, not assembler) on an IBM 709 at Brown University, and later on DEC (PDP 8, 10), IBM 360, Cyber, Cray, etc. Along the way, I got a BS in EE from Northeastern University in Boston, MA, and an MS in EE from The Johns Hopkins University. Although I am not an alumnus with a degree, I earned essentially another MS in computer science from U Maryland in the mid 1980's where I fell in love with LISP. So I became a LISP Machine hacker when AI was hot. But it was KTH's cutting edge research in wireless that got me to finally go ahead and finish a doctorate beginning in 1997 and ending on 8 June
Software Radios: I coined the term software radio in 1991 to signal the shift from digital radio to multiband multimode software-defined radios where "80%" of the functionality is provided in software, versus the "80%" hardware of the 1990's. You can read an overview of this foundation of cognitive radio on my personal home page on Compuserve. As many of you know, nearly 10 years later, that vision is becoming a reality. In June 00, a major cellular infrastructure supplier began shipping software-defined radio cell sites with 70 MHz ADCs (digital IF), all digital channel processing, and much less analog plumbing than the prior generation. In addition, the roll-out of 3G will be incremental, and there are many parallel efforts now in creating software-defined handsets for 3G.
SDR Forum: When I was elected to chair what became the Software-Defined Radio (SDR) Forum in March of 1996, I saw the need for world-wide cooperation in the definition of open-architecture for SDR. Industry determined that its needs for rapid definition of standards would be met best in a forum patterned after the ATM Forum than in a standards body. That Forum has issued several technical reports and a marketing report. It is currently the focus of attention in the transition of militarily-funded CORBA-based middleware into the commercial sector. See the SDR Forum web site for more on this important global organization.
Enterprise Architectures: Of course, there is a big difference between an open architecture that all of industry accepts and an enterprise architecture for SDR that will help your company achieve its business objectives (or that will help your government procurement organization achieve its goals for radio system acquisition, open architecture, affordability, etc.). In addition, although the Forum promotes the application of object oriented technology to SDR, you need to be pretty knowledgable on this topic in order to engage with the forum, follow the technical discussion, and contribute. For the serious radio systems engineer (or for the RF hardware engineer or non-radio software engineer who aspires to greater things), the text Software Radio Architecture, which I wrote for Wiley Interscience is available in September, 00. This text provides historical background on the US SPEAKeasy and JCIT software-radio technology pathfinders, as well as the European Community's Flexible Integrated Radio Systems Technology: a collaborative project which invested IMT-2000 Software Radio technologies (partially funded under the CEC ACTS program). ( I have been unable to identify an Asian SDR technology pathfinder of the mid-1990's, but I would like to set the record straight if one existed, so please email me if you know of one. ) In addition, this text develops an object-oriented approach to radio architecture that takes the best of what I have observed from DoD and commercial SDR projects and technology pathfinders. The book is based on my three day software radios short-course organized by Technology Training Corporation in the US and by HySilver of the UK. The core chapters present the architecture tradeoffs associated with broadband antennas, RF/IF conversion, ADCs, DACs, digital interconnect, digital signal processing hardware platforms (dsp cores, chips, ASICs, FPGAs, RISC and CISC machines), and software. The software chapters develop the middleware architecture in detail. In addition, during my years from 1976 to 1993 while in industry, I earned many bonuses by rescuing SDR precursor projects. I found that most of them failed to allocate end-to-end budgets for dynamic range (e.g. automatic gain control versus bits in the ADC). But the worse offense for causing flaky performance in the integration laboratory was the failure to predict, model, and measure end-to-end computational resources. The text therefore spends considerable attention on practical, low cost techniques for doing this. This includes how to write a statistically defensible specification and how to manage the hardware-software function and capacity allocation so that you build a robust (but not overlkill) software architecture on top of an affordable (but sufficient) hardware platform. Hardware overkill makes your system unaffordable in production. Software overkill makes the system prone to crashes. Since I have had a full and satisfying career in this field, I thought it would be nice to share this knowledge wtih the next generation, and that is the intent of the book. (Texts like this are a "labor of love" - the author never "makes any money" on them.)
SDR Researchers: For the researcher, there is a surrogate graduate text that came about because of David Tennenhouse's interest in this area. He and I collaborated on a proposal for an IEEE Journal on Selected Areas in Communications (JSAC). (He went to DARPA and left me to be the editor). That JSAC was published in April, 1999 containing seventeen great papers covering everything from architecturre and hardware platforms to software Applications Programmers Interfaces (APIs) to smart antennas. I recommend that JSAC as a companion to my text. In addition, the IEEE plans to publish a compendium of software radio technology papers this year as well. I recommend the new text. Most of the papers in the JSAC are in the text, but the text contains papers that are not in the JSAC.
What About Cognitive Radio? Cognitive Radio is a hard research topic within the realm of software radio. Since this was my doctoral research area and my area of current research focus, instead of providing an overview with pointers as for SDR, here are some serious materials:
Dissertation Defense for Cognitive Radio:
Cognitive Radio Dissertation Defense [ppt file; 3.2 MB - Download with Care]
Doctoral Dissertation on Cognitive Radio:
Cognitive Radio Dissertation Defense [pdf 1.6 MB - Download with Care]
licentiate thesis without published papers (1999) [pdf file ~1 MB]
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Latest update 19 June 2010
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