oor scenario was a typical suburban scenario. The scenario is charac- terized by NLOS and multipath propagation with houses of 6-9 m height in the surrounding area. The BS antenna covered a single 120° sector and was mounted at a window of a modern office building. For the BS antenna, a commercial cross- polarized outdoor antenna (+45°) with 11 dBi gain and built-in down tilt of 3° was used. The antenna height was 15 m above the ground and above rooftops of the sur- rounding buildings. The UE antennas were installed at 2-m height on a mobile trol- ley. A fixed route was taken on several runs with constant speeds of 1 m/s. The path loss on the measurement track ranged from -80 to -60 dB. The distance between BS antenna and UE was between 30 and 80 m. The first results taken from the indoor scenario (Figure 11.22) show that the targeted BER of 2 X 10-2 can always be met by the closed-loop scheduling algo- rithm. The fluctuations toward lower BERs are caused by the discrete MCS. If the BER UE 0 BER UE 1 Time (s) Figure 11.22 Measured BER versus time. © 2009 by Taylor & Francis Group, LLC Early Real-Time Experiments and Field Trial Measurements Single-stream tx Multi-stream tx Time (s) Figure 11.23 Resource block allocation, spatial modes. BER requirement cannot be reached, the next MCS is applied with a reduced data load and hence fewer errors. The spatial mode selection over time (Figure 11.23) shows the RB allocation for both UEs in the indoor scenario. The resource block index contains 48 RBs per antenna in the frequency domain. The color of each RB indicates the spatial mode assigned by the scheduler to the UE. Black indicates single stream, and gray indicates the dual-stream mode. White indicates no resources assigned to this UE. The allocation table shows that all modes are utilized for both UEs. If two users have the same priority at the same resource, the scheduler assigns the odd resources to UE 0 and the even resources to UE 1. This explains the striped structure in the allocation plot and is a very simple