Jonathan Haws Blair Leonard Khemmer Porter Joshua Templin Software Defined Radio A Modular Approach

2 Review of SDR (JON) Software Defined Radio –Multipurpose hardware –Significant utility in military and cellular markets –Modular architecture allows for fast development Precursor to “Cognitive Radio”

3 Problem (JON) Design a software defined radio that has the ability to: 1.Change modulation techniques “on the fly” 2.Avoid unwanted white noise 3.Provide a means to easily implement the same software on other radios

4 Solution (JON) Code and implement on a DSP various algorithms that provide the desired functionality of the radio Keep code modular (C++ classes) Final product useful for ECE5660 course

Development Process (JON) 1.Algorithms coded in Matlab 2.Simulations performed in Matlab 3.Algorithms ported to C++ 4.Simulation verification in C++ 5.C++ code implemented on DSP

System Block Diagram (JON)

Matlab Coding (BLAIR)

8 Matlab Simulation Results (BLAIR) MATLAB simulation square 16- QAM modulation Raw Signal Demodulated Signal

C++ Coding (KHEMMER)

C++ Simulation Results (KHEMMER)

GUI Controller Software (JOSH)

RTDX Communication with SD Boards (JOSH)

13 Spectrum Digital DSP Boards (JOSH/JON) SDI TMS320C6713 DSP Boards 225 MHz 512KB Flash 8MB SDRAM Microphone, Speaker, Mono In/Out audio ports USB Interface

DSP Default Parameters (JON) Sample Rate: 96kHz Carrier Frequency: 24kHz –24kHz allows for easy calculation of sine and cosine functions (+1, -1, 0, …) Anti-Aliasing Filter: 4kHz LPF Bit Rate: 2400bps Downsample Factor: 10 Bits/Symbol: 4 (Square 16-QAM)

15 Modified Demonstration (JON)

16 Any Questions? We appreciate your time. Thank you for coming!