Digital Radio Receiver

1. Digital Radio Receiver Amit Mane System Engineer

2. Introduction • Virtually all digital receivers perform channel access using DDC • The desired channel is translated using the digital mixer comprised of multipliers and DDS • The sample rate is then adjusted to match the channel bandwidth • CIC filter • Two poly phase decimators

3. Introduction • The functions performed in the system are • Waveform synthesis (DDS) • Complex multiplication • Multirate filtering • The overall sample rate change of the DDC is 120 • The DDS mixer has a SFDR of 102 dB • The data rate can be upto 208 MHz

4. Introduction • Innovative DRR System requires • One Quadia • Two UWBs • Number of channels implemented = 40

5. Complete System

6. Block diagram

7. Digital Receiver Block Diagram 20 channels of I/Q @ 4.33 MSPS 32--bit DDR RAM 16Mx16 10 channels of I/Q @ 1.0833MSPS 16-bit A/D 12-bit 130/208 MSPS A UWB 1 of 2 A Clock DCM In = DSP1 EMIF Clk Out = DSP1 EMIF Clk A/D Intf Test Generator Quadia Logic 1 of 2 Dual Queue VFIFO 1 of 20 channels FIFO FIFO J4 Link 1 of 20 channels J4 link A/D Mux Mixer Gain Clock circuitry CIC 30:1 Test Mux CFIR 2:1 PFIR 2:1 Spectral invert Test Mux DSP Clk DSP1 Registers Data Flow Controller Overflow detect FIFO FIFO A/D Intf Interrupts Test Generator NCO A/D 12-bit 130/208 MSPS B 10 channels of I/Q @ 1.0833MSPS 16-bit Registers A/D input select Mixer Freq Rev Code Status Gain Test Register Test Controls 2-bit Register Spectral Inversion 20-bit DSP2 Registers DRR FIFO Thresh DSP Overflow detect Triggering Register Rev Codes Interrupts Clock DCM In = DSP2 EMIF Clk Out = DSP2 EMIF Clk Command Channel StatusRegister DCMs locked Reset PCI FPGA

8. UWB

9. Filter Guide

10. MATLAB Development System

11. DDC Frequency Response

12. MATLab SimuLink Development • MATLab and Simulink used with Xilinx System Generator • Simulink gateways provide connection to physical hardware and connect with Framework Logic • End-to-end simulation under MATLab • JTAG link allows real hardware to be tested from MATLab environment • System Generator links Xilinx tools for chip design

13. Using Simulink and System Generator • Simulink Block libraries are used to draw the system • Innovative BSP provides blocks for UWB components • Simulink blocks for DSP, data generation and viewing • Xilinx System Generator links all blocks Starting a new design!

14. Simulink Libraries • Board Support Package for CS includes hardware and signal processing components • A/Ds, J4, DDCs ....

15. SimuLink Block Diagram • The top level design has the Xilinx System Generator block for integration with logic tools Top Level Design

16. Xilinx System Generator Integrates with Simulink • Compiling and fitting the design is done directly from the Simulink environment

17. Design Using Simulink Blocks and Functions • Large libraries of DSP and logic function may be directly used • Drag-n-drop from Simulink libraries

18. Validating the Design • Validate the design by including the hardware in the Simulink • Hardware in the loop testing using JTAG • Bit-true and cycle-true testing Observe and analyze real data inside Simulink Flow data from Simulink through the hardware and back to Simulink The Real Hardware

19. Design Testing using Simulink • Run real-time or Simulink test data through the actual design Execution Control

20. VHDL Development Tools Flow

21. Quadia Application Logic Simulation

22. Multiple Channel on DSP 0 Ten Channels per DSP

23. Multiple Channel Operation DSP 0 DSP 2 DSP 1 DSP 3

24. Spectral Inversion Testing 32.51 MHz Input 32.52 MHz Tune fs = 129.843 MHz Before Spectral Inversion... 9.7 kHz

25. Spectral Inversion Testing 32.51 MHz Input 32.52 MHz Tune fs = 129.843 MHz After Spectral Inversion... 531 kHz

26. Thank you !