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

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

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

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

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 HyperLAN Satellite Communication IRRIDIUM, ICO, THURAYA

13 Software Radio Resources SDR Forum GNU Software Radio