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commSIM 7 Network & Communications Simulation User Guide & Block Reference Comm

commSIM 7 Network & Communications Simulation User Guide & Block Reference Commsim and Electronics Workbench copyright  1989, 1992-2004 Interactive Image Technologies Ltd., Visual Solutions, copyright  2004. All rights reserved. Communication chapters of the Commsim 7 Getting Started Guide and the Commsim 7 User Guide and Block Reference (e.g. Comm Block descriptions) are a copyright  2004 of Eritek, Inc. and are reprinted under license. All other brand or product names are trademarks or registered trademarks of their respective companies or organizations. CS7-E-1721 Rev. 1  2004 Interactive Image Technologies Ltd. All rights reserved. Published April 2004. Printed in Canada. Preface Welcome to Commsim 7. Commsim provides the ideal solution for designing and simulating analog and digital end-to-end communication links. The Commsim library supports digital and analog modulation, channel modes, demodulation, phase locked loops, error correcting codes, and bit error rate analysis, to mention a few. Through its support of complex math, Commsim enables the use of complex envelope simulations. By using lowpass equivalent models, you can significantly reduce the computing load required to support most communication analysis problems. This guide provides a detailed discussion of advanced topics for users of Commsim as well as a complete reference of the Comm and Core Blocks available in Commsim. Depending on your version of Commsim, your software may have some feature limitations. See the section entitled Version Details (in the Commsim 7 Getting Started Guide) for more information. Conventions used in this book The following typographical conventions are used in this manual: In addition, unless specifically stated otherwise, when you read “click the mouse…” or “click on…,” it means click the left mouse button. Convention Where it’s used Shortcut key combinations Shortcut key combinations are joined with the plus sign (+). For example, the command CTRL+C means to hold down the CTRL key while you press the C key. Hot keys Hot keys are the underlined keys in Commsim’s menus, commands, and dialog boxes. To use a hot key, press ALT and then the key for the underlined character. For instance, to execute the File menu’s Save command, hold down the ALT key while you press the F key, then release both keys and press the S key. SMALL CAPS To indicate the names of the keys on the keyboard. ALL CAPS To indicate directory names, file names, and acronyms. Initial Caps To indicate menu names, commands names, and dialog box options. What’s new in Commsim 7 Feature Function Multiple open diagrams Switch to different diagram windows easily. Close diagram Close a diagram without quitting Commsim. Save embedded files Save the changes to embedded diagram files. Save all diagrams Save changes to all open diagrams. Pop-up Edit menu Easy access to frequently used Edit menu commands. Multiple level Undo Undo previous editing actions. Auto wiring Allows bulk connection of aligned connectors. Align blocks Group block alignment commands. Navigation tags Go to specific diagram locations quickly. Report generation Create statistical reports for block diagrams. Optimize matrix usage Speed up simulations. Compare diagrams Mark differences in two diagrams. Complex number support Support of complex numbers in const, mul, div, add, gain, merge, case, unitDelay, and sampleHold blocks. Matrix generation Use of diag (), eye (), ones (), and zeros () as input to const and expression blocks. Matrix manipulation reshape block Matrix operations complexToReIm and magPhase blocks Event-driven simulation stateTransition block Vector notation for 1/Z block Set initial condition as scalar or vector value. Subplots Create multiple plot windows. Signal generation blocks triangleWave, squareWave, and sawtooth blocks Dialog tables Automatic dialog creation from data table. References to other books Getting help For information on getting help, refer to the Commsim 7 Getting Started Guide. Technical support For information on technical support, refer to the Commsim 7 Getting Started Guide. For information on Refer to Block diagram modeling and simulation Karayanakis, Nicholas M., Computer-Assisted Simulation of Dynamic Systems with Block Diagram Languages. CRC Press, 1993. Scientific computing Abramowitz, M.; Stegun, I. A. Handbook of Mathematical Functions, Applied Mathematics Series, vol. 55, Washington: National Bureau of Standards; reprinted Dover Publications, New York, 1968. D’Azzo, John J.; Houpis, Constantine H. Linear Control System Analysis & Design - Conventional and Modern. McGraw-Hill Book Company, 1988. Fitzgerald, A. E.; Kingsley, Charles Jr.; Umans, Stephen D. Electric Machinery. McGraw-Hill Book Company, 1983. Flannery, B. P.; Press, W. H.; S. A.; Vetterling, W. T. Numerical Recipes, The Art of Scientific Computing. Cambridge University Press, 1989. Franklin, Gene F.; Powell, David J. Digital Control of Dynamic Systems. Addison-Wesley Publishing Company, 1980. Gear, C. W. Numerical Initial Value Problems in Ordinary Differential Equations. Prentice-Hall, 1971. Stoer, J.; Bulirsh, R. Introduction to Numerical Analysis. New York: Springer-Verlag, 1980. Computer Programming Darnell, Peter A.; Margolis, Philip E. C: A Software Engineering Approach. Springer-Verlag, 1990. Industrial Controls McMillan, Gregory. Tuning and Control Loop Performance: A Practitioner’s Guide. ISA, 1993. License Agreement Please read the license agreement included in the Commsim 7 Getting Started Guide carefully before installing and using the software contained in this package. By installing and using the software, you are agreeing to be bound by the terms of this license. If you do not agree to the terms of this license, simply return the unused software within ten days to the place where you obtained it and your money will be refunded. Commsim 7 User Guide and Block Reference i 1. Introduction 1.1 A typical communication system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.2 Lowpass equivalent systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 1.3 Communication blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 2. Solving Implicit Equations 2.1 Setting up an implicit equation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2.2 Solving an implicit equation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 2.2.1 Using the Implicit Solver property sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 2.3 Implicit equation examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 2.3.1 Simple nonlinear implicit equation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 2.3.2 Advanced nonlinear implicit equation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 3. Performing Global Optimization 3.1 Global optimization basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3.1.1 Cost functions with many local minimum values . . . . . . . . . . . . . . . . . . . . . . . 3-2 3.1.2 Cost functions with no minimum values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 3.2 Performing global optimization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 3.2.1 Using the Optimization Properties dialog box . . . . . . . . . . . . . . . . . . . . uploads/Management/ commsim-userguide.pdf