Model-Based Design and SDR

Fabio Ancona Sundance Italia SRL

CEO – Sales Director

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Model-Based Design

Designing complex systems needs new design methodologies:– Binary coding.– Assembly coding.– C programming.– Model-Based Designing.

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Aim of Model-Based Design

Aim of Model-Based Design methodology is:– Simplify design entry.

Graphical design entry. Hierarchical system design.

– Design reuse: Design library. Sharing designs.

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Model-Based Design tools

Properties of a good Model-Based Design tool:– Easy design entry.– Design simulation.– Code generation.– Testing on real hardware.

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Easy design entry

Easy design entry helps to reduce the system design time.

The design entry tool should be:– Graphical.– Library for different functions.– Library for hardware resources.

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Design simulation

Simulation helps to find error and bugs in the early stages of design entry.

The simulation should be:– Accurate.– Target processor specifications.– Simple and fast.

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Code generation

Model to C source code. Generated code should be:

– Optimized.– Suitable for embedded systems.– Be fast and without user intervention.– Provide tools to generate downloadable

application from generated source code.

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Testing

Testing generated code on target hardware. Hardware In the Loop (HIL) testing.

– Designed system runs on target hardware.– Workstation send test vectors to system under

test.– Output of system under test is analyzed by

workstation.

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Model-Based Design tools

Simulink/Matlab (The MathWorks Inc) LabView (National Instruments)

– Suitable for test and measurement design.– Limited capability for embedded system

development VEE (Agilent)

– Suitable for developing test and measurement systems.

– No code generation capability.

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Simulink/Matlab

Suitable for number crunching systems such as SDR.

Large selection of code generation targets.– SMT6050 : targeting Sundance DSP modules.

code optimization options. HIL testing (SMT6050)

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Simulink + SMT6050

Simulink (The MathWorks Inc)– Design Entry

SMT6050 (Sundance)– Code generation compatible with Sundance DSP

modules.

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Simulink

Interactive graphical user interface for system design.

Simulating designed system. Extensive and expandable libraries of

predefined blocks.

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SMT6050

Code generator for Simulink – Generate optimized, embeddable C source code

targeting Sundance DSP modules.– Add blocks representing hardware resources

(input/output, ADC, DAC).– Generate code for HIL testing.

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SDR design

Purpose:– To demonstrate how self sufficient code could be

generated using Simulink + SMT6050 System

– FM3TR reference waveform modulator/demodulator.

– Design– Simulation– Code generation– HIL testing

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FM3TR

Multi-band, Multi-waveform, Modular, Tactical Radio (FM3TR) waveform.

A reference waveform for SDR Forum consideration. – Provides the SDR Forum and its members a non-

proprietary, complex narrowband frequency-hopping waveform for implementation as a common test and demonstration tool. There are a number of systems [US, UK, GE, FR] that have already implemented and successfully demonstrated interoperability using this test waveform.

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FM3TR

Frequency range: 30-400KHz Channel spacing: 25kHz Modulation type: CPFSK Modulation rate: 25kbps Frequency hopping - 250-500 hops/second Framing, packetization 16kbps CVSD Voice coder Data channel with Reed-Solomon Coding

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FM3TR modulator/demodulator

Implemented and simulated in Simulink. Test bench.

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FM3TR modulator

Modulate the incoming signal according to FM3TR standard.

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FM3TR Demodulator

Compatible with developed modulator.

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Hardware

Sundance SDR kit.– TMS320C6416 running at 1GHz.– 2 ADC sampling rate up to 105 MHz.– 2 DAC sampling rate up to 400 MHz.– PCI interface for high speed data communication

with PC.

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Code generation (SMT6050)

Targeted Sundance SDR kit.– Building all of the required library automatically.

Libraries were compiled and linked using the specified complier and linker switches.

– All required files was generated. C source files. Linker command file. Make file. Batch file.

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HIL testing

All of the code for HIL testing is generated automatically– Communicating with host.– Synchronization.

Data flow synchronization.

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HIL testing FM3TR

Modulator/demodulator runs on DSP.– Code for Modulator/Demodulator generated.

Test bench runs on host.– New test bench model is created.

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FM3TR code generation

Modulator/demodulator dragged and drops to a new model.

Host communication blocks added into it.

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HIL test bench

Modulator/demodulator subsystems is replaced by SMT310 block.

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HIL testing

Generated application from modulator/ demodulator was loaded into DSP.

Test bench ran on host. The validity of generated code was proved.

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Generated code:

Generated code is fully documented:– Comment on source code.– Code generation report with a hyperlink from

Simulink block to the generated code.

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“Is code good ?”

Yes, automatically generated code is good from many perspectives:– speed– memory utilization– reliability– optimization options– one can incorporate legacy/custom code …– …

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Conclusion

The next innovation in system design is Model-Based Design.

An effective Model-Based Design can reduce the development time.

HIL testing is a suitable technique for testing generated code.

Simulink + SMT6050 is an effective combination for developing SDR systems using Model-Based Design Technique.– Generate code targeted Sundance SDR modules.– Generate all codes for HIL testing.

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Questions