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DSP Techniques for Software Radio

DSP Techniques for Software Radio. Introduction Dr. Jamil Ahmad. DSP for Software Radio. Contents Introduction DSP in Communications Digital Front-End Processing Digital Waveform Processing SDR System Example and Demo. Introduction. Aims of this Workshop Software Radio Architecture

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DSP Techniques for Software Radio

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  1. DSP Techniques for Software Radio Introduction Dr. Jamil Ahmad

  2. DSP for Software Radio • Contents • Introduction • DSP in Communications • Digital Front-End Processing • Digital Waveform Processing • SDR System • Example and Demo

  3. Introduction • Aims of this Workshop • Software Radio Architecture • The Role of Software Radio • Review of DSP Concepts

  4. The Aim • Insight into Modern Wireless Technology • Fundamental knowledge of Signal Processing in Modern Communication Systems • Learn and Practice Approach • Use of Simulation Tools in the Design Process

  5. What is Software Radio ? • Radio Functionality defined in Software • Reprogrammable and Reconfigurable • Same hardware Perform different functions at different times. • Supports broad range of frequencies, air interfaces and software applications • “physical layer behavior can significantly be altered through changes in its software”

  6. Application Software Framework,API OS,Drivers,Midware Antenna Control/ Management FPGAs DSPs Microcontrollers AF Data Conv. User Data Application Band Selection Software Radio Architecture • Ideal Architecture

  7. Software Radio Architecture • Evolving Architecture Programmable Hardware – DSP, FPGA, ASIC -Channeliz-ation -Sampling Rate Conversion -Baseband I/Q Output Flexible RF Hardware DSPPROCESSING - Modem Functions - Control - Module Library - Operating System ADC DAC Input Hardware Part Software Part Generic Architecture

  8. Software Radio Architecture • Traditional Architecture • Heterodyne / Super heterodyne ADC AMP LNA AMP AMP BPF BPF BPF 90 LO ADC AMP LO Frequency Synthesizer Duplex -er DSP Demodulation Equalization Channel Decode Pulse Shaping DAC PA AMP BPF BPF 90 LO DAC

  9. DSP Front End RF Front End Down Conversion LO Channel Selection Band Selection LNA BPF LPF AGC ADC DDC Duplex -er PA AMP BPF BPF DAC DDS Up Conversion LO Software Radio Architecture • State of the Art • Direct Conversion Architecture (Zero IF)

  10. Software Radio Architecture • Direct Conversion • Flexible RF • Supports Multiple Air-Interface Modes and Bands • Less Distortion and Thermal Noise

  11. SDR Support Devices

  12. Software Radio Applications • Mobile Cellular Communication • 2G, 2.5G, 3G, 4G … • GSM, GPRS, UMTS, MIMO Time-Space Coding • Broadcast Systems • DAB,DRM, DVB, HD-Radio • Navigation/Traffic Monitor • GPS, MS DirectBand, RDS • Wireless Broadband Access • IEEE 802.11 • HyperLAN • Satellite Communication • IRRIDIUM, ICO, THURAYA

  13. Software Radio Resources • SDR Forum • http://www.sdrforum.org/store.html • GNU Software Radio • http://www.gnu.org/software/gnuradio/

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