1. Propagation and Throughput Study for 802.16 Broadband Wireless Systems at 5.8 GHz Thomas Schwengler& Niranjan Pendharkar

2. Radio Description Latest revision of MAN, IEEE 802.16-2004. Latest revision of MAN, IEEE 802.16-2004. OFDM - 256 FFT with variable rate coding as well as modulation capabilities. OFDM - 256 FFT with variable rate coding as well as modulation capabilities. Line Of Sight, Near-Line of Sight operation. Line Of Sight, Near-Line of Sight operation. Multiple access granted via time slots. Multiple access granted via time slots.

3. Lab Testing Radio performance tested on fixed SUI models. Radio performance tested on fixed SUI models. High PAPR of OFDM signals present emulator tuning problems. High PAPR of OFDM signals present emulator tuning problems. True WiMAX with 2048 sub-carriers may present even greater problem… True WiMAX with 2048 sub-carriers may present even greater problem…

4. Traffic Generator Ethernet SU BS circulator Spirent SR5500 Ch. 1 Ch. 2 PAD SU Air Interface Antenna Ethernet

5. Urban Testing True field tests without fading emulator, circulators, etc. True field tests without fading emulator, circulators, etc. BS positioned atop a building (13 floors), SU’s placed 6-ft above ground at different locations in suburban area of Denver. BS positioned atop a building (13 floors), SU’s placed 6-ft above ground at different locations in suburban area of Denver. On-demand modulation. On-demand modulation.

6. Results – Lab Tests Throughput for 16-QAM modulation in SUI-1 and SUI-3 channels. Throughput for 16-QAM modulation in SUI-1 and SUI-3 channels.

7. Observation Average throughput is almost constant despite differences in statistical behavior of various channels. Average throughput is almost constant despite differences in statistical behavior of various channels.

8. Results – Field Tests Statistical comparison of results in SUI-1 & SUI- 3 channels in lab, and field tests. Statistical comparison of results in SUI-1 & SUI- 3 channels in lab, and field tests.

9. Observation Throughput performance comparison for several modulation schemes in different fading environments Throughput performance comparison for several modulation schemes in different fading environments