 2 Mbps downlink and 512 kbps in uplink. Then a second subscribe station was added to the picture but the throughput was still increasing. The subscriber stations were added till the total throughput of the sector start to degrade from 5.9/4.1 Mbps in the downlink. In our case the throughputs started decreasing with the addition of an eeghth user with both 16-QAM and 64-QAM modulation techniques. Thus, maximum capacity (5.9 Mbps) can be achieved by eight users in parallel in downlink using the stated profile (Figure 4.17). The same two scenarios were repeated in the second test bed. Due to the presence of skyscrapers which resulted in multipath interference the single user throughput was down to 4.8 Mbps and 3.2 Mbps with 64-QAM and 16-QAM in the downlink respectively. However, similar to the first test bed the total sector throughput also started to degrade after the introduction of the eighth user. 4.5.1.1.3 Embedded Sector Capacity Test This capacity test was conducted under loaded conditions in the second test bed. It was conducted in an embedded sector, enclosed by four other sectors operating on the same carrier (one each from four adjacent cell sites). The test vehicle with two terminals is driven in the embedded sector while the other eight terminals (two per sector) are placed (stationary) in the remaining four sectors to generate traffic and create interference. This scenario gives us a much more realistic picture of the WiMAX network's behavior towards interference. It was noticed that adjacent cell interference didn't have a major impact on the overall performance of the embedded sector due to the presence of AAS and AMC (adaptive modulation and coding) and as shown in (Figure 4.18). And, the average sector throughput was 5.5 Mbps in the downlink which is similar to average sector throughput as shown in Figure 4.17. Next Generation Mobile Communications Ecosystem Max DL Sector Throughput (64QAM) Max DL Sector Throughput (16QAM) Average DL Sector Throughput (w/64QAM) Average DL Sector Throughput (w/16Q