ernet. The testing was conducted in the commercial district with skyscrapers to understand the performance, capacity and coverage aspects. Various test cases and scenarios were conducted to evaluate the performance of WiMAX technology. The data was carefully collected and post processed using the required test tools during the trial. Some of these test cases and their results are as follows. 4.5.1.1.1 Coverage The coverage test was performed in both test beds. The output power of the base station and the CPE were measured and other necessary measurements were taken before initiating the test. The test van was slowly driven through the measurement sector and performed a continuous download of a FTP file (approximately 700 MB). The testing was conducted with and without AAS using PCMCIA cards. The data logs were stored and processed accordingly. The results showed that the sector radial coverage is 0.95 km without AAS and 1.61 km with AAS (beamforming) in a flat terrain and 0.7 without AAS and 1.2 km with AAS in the high-rises area. Thus, we saw a 70% improvement in coverage with beamforming. IEEE WiMAX ASN GW Internet Figure 4.16 Second test bed architecture 4.5.1.1.2 Same Sector Capacity Test Capacity testing was executed using both single and multiple WiMAX-enabled PCMCIA cards in both test beds. The tests were conducted using different modulation schemes at a RSSI (Receive Signal Strength Indicator) range of -60 to -80 dBm. In the first scenario, single CPE was used to check the maximum data rate that can be achieved by a single user. It was conducted by downloading a huge file (approximately 700 MB) from a local FTP server while driving in a single sector. The result shows that the maximum user data rate for a single CPE is 5.9 Mbps with 64-QAM and 4.1 Mbps with 16-QAM in the downlink and 1.6 Mbps with 16-QAM in the uplink. The throughput started to decrease dramatically as the RSSI goes below -85 dBm. In the second scenario, the test was started with a single CPE which was downloading files using a profile of