angle; the transmit power was 2.5 W at 2.6 GHz and a 20-MHz bandwidth FDD. During the coverage measurements, two UEs were colocated inside one car and driven around the area with speeds during the mea- surements of 5-40 km/h. In order to demonstrate the capacity and robustness of the new high-rate air interface, high-rate video streaming to each individual user was showcased. By exploiting adaptive MIMO mode selection (MIMO [2Tx, 2Rx], SIMO [1Tx, 2Rx]) and fast-loop MCS level adaptation (QPSK, 16 QAM, 64 QAM, 1/2, and 2/4 rate coding), a target BER of 10-3 was achieved robustly throughout the coverage region. The coverage area was more than 800 m from the base station. AHARQ retransmission scheme was also used SO that high-rate videos could be streamed reliably within the whole measurement scenario. In Figure 11.37, we see the sum rate measured with two colocated users around the campus area. © 2009 by Taylor & Francis Group, LLC Early Real-Time Experiments and Field Trial Measurements MIMO/SIMO 120 Mbps 100 Mbps 80 Mbps 60 Mbps 40 Mbps 300 m 20 Mbps Ernst Reuter Platz 600 m Image©200 7)AeroWest 900 m Figure 11.37 Sum rate distribution with two colocated users using a propor- tional fair scheduler. The capability of achieving a PHY throughput of more than 60 Mb/s has a remarkable correspondence to the chances of dual-stream transmission. For these high rates, in order to exploit the spectrum more efficiently, one relies significantly on dual-stream transmission made possible by the high SNR available in the cell. In Figure 11.38, the area of dual-stream availability is depicted in black (red), and the areas of single stream only are depicted in white (blue). The area is considered as dual-stream capable when at least one resource block can be operated in dual- stream mode as the spectrally more efficient transmit mode compared to single- stream transmission. C 2009 by Taylor & Francis Group, LLC Long Term Evolution: 3GPP LTE Radio and Cellular Technology Ernst Reuter Platz Berlin Technische 500 m Legend Base stat