 Munich Figure 11.10 Picture depicting the measurement track. small trolley through the room along a predefined line with constant velocity. The start is from a door 5 m away from the BS and the end is outside the room on the floor about 35 m from the BS. Outdoor. The XPD base station antenna (+45°) is positioned outside the win- dow of the office facing away from the glass front of the building. The covered area is depicted in Figure 11.10. The UE is installed inside a measurement van and the antennas are mounted 30 cm above the roof of the car. The two UE antenna polar- izations are positioned vertically and horizontally. The same predefined route was followed in every experiment, with different antenna configurations at a constant velocity of about 3-5 km/h. The route consisted of areas with very low, medium, and very high path loss covering a dynamic range between -92 and -40 dBm at the receive (Rx) antennas of the UE. 11.2.4 Indoor Results 11.2.4.1 Singular Value Distribution of the Measured Channel First experiments were conducted in a typical indoor office environment in order to verify the performance of channel estimation and MIMO detection for a single- user scenario. We focused primarily on the downlink, using 2 X 2 MIMO and link adaptation; the uplink was operated in a robust 1 X 2 SIMO scheme with MRC at the receiver. In order to validate the system under operation, a specially prepared LMT was writing measured data sets, such as channel state information, SINR, and AGC values, and achieved a bit error rate (BER) with and without coding and bit-loading information from the link adaptation into log files. From the log files, we extracted plots over time and frequency that will be discussed in the following sections. The © 2009 by Taylor & Francis Group, LLC Early Real-Time Experiments and Field Trial Measurements Empirical Cumulative Distribution Function of Singular Values Singular Values Figure 11.11 CDFs of the singular values during the experiments in the 2 X 2 MIMO downlink in 20-MHz bandwidth, c