Case Study – Phase 4 Transmitter Receiver Simulation

1. Case Study – Phase 4 Transmitter Receiver Simulation Siddharth Nair G200901750 EE 578

2. Outline • Multipath Fading • Introduction To OFDM • OFDM Modulator • Receiver Design • Convolutional Coding • BER Vs SNR Curve • Q&A

3. Data Transmission Over Multipath Channel

4. OFDM

5. OFDM Symbol – Time Domain Courtesy : OFDM For Wireless Multimedia Communications – Richard Van Nee, Ramjee Prasad

6. Cyclic Prefix Courtesy : OFDM For Wireless Multimedia Communications – Richard Van Nee, Ramjee Prasad

7. OFDM Modulator Courtesy : http://upload.wikimedia.org/wikipedia/

8. Receiver Design – OFDM Receiver Courtesy : http://upload.wikimedia.org/wikipedia/

9. Receiver Design – ZF Equalizer Courtesy : http://www.dsplog.com/2008/10/24/mimo-zero-forcing/

10. Simulation Parameters • OFDM • FFT Size = 128 • Cyclic Prefix = 64 • Subcarriers 1-10, 119-128 Nulled – Guard Bands • Subcarriers 61-69 Nulled To Avoid DC Components • Data Per OFDM Symbol = 100 QPSK Symbols • Baud Rate = 20MHz • Frequency Selective Channel • Tap Delays = 0, 2e-6, 2e-7 s • Tap Power (dB) = 0, -2, -10 • Symbols Per Frame = 4 • MIMO Configuration = 2 x 2

11. Channels

12. Constellations – No AWGN Added

13. BER Vs SNR

14. Simulation Parameters • OFDM • FFT Size = 128 • Cyclic Prefix = 16 • Subcarriers 1-10, 119-128 Nulled – Guard Bands • Subcarriers 61-69 Nulled To Avoid DC Components • Data Per OFDM Symbol = 100 QPSK Symbols • Baud Rate = 1MHz • Frequency Selective Channel • Tap Delays = [0 60 75 145 150 150 155 190 220 225 230 335 370 430 510 685 725 735 800 960 1020 1100 1210 1845] * 1e-9 • Tap Power (dB) = -6.4,-3.4,-2,-3,-5.2,-7,-1.9,-3.4,-3.4,-5.6,-7.4,-4.6,-7.8,-7.8,-9.3,-12,-8.5,-13.2,-11.2,-20.8,-14.5,-11.7,-17.2,-16.7 • Symbols Per Frame = 4 • MIMO Configuration = 2 x 2

15. Channels

16. Convolutional Coding HALF RATE CONVOLUTIONAL ENCODER

17. BER Vs SNR

18. THANK YOU !!QUESTIONS AND COMMENTS SIDDHARTH NAIR G200901750 EE-DEPT- KFUPM