Rank-8 are improved compared to Figure 11.29 when the low correlation antenna configuration is used on the BTS side. 11.3.2.2 Field Experiment in a Long Corridor Environment Figure 11.31 shows the measurement area and environment of the long corridor envi- ronment. The propagation is LOS with many reflection paths. The antenna height and down tilt of the BTS are 2.0 m and 0°, respectively. The BTS is installed at one side of the corridor and directed through a passage to another side of the corridor. The UE is fixed at each point in 5 m steps from 5 to 60 m away from the BTS. The antenna height of the UE is 1.7 m. A patch antenna is used in both the BTS and the UE. 11.3 Field Experiments with Sub-6-GHz 5G Radio Figure 11.30 CDF of downlink throughput with distributed Tx antenna configuration. Rank 8 64QAM R = 0.8 Rank 4640 QAM R = 0.8 Rank 2 64 QAM R = 0.8 Rank 8 16QAM R = 0.5 Rank 8 QPSK R = 0.5 Rank 4 16 QAM R = 0.5 Downlink throughput (Gbps) stairs, window Ev hall, window Figure 11.31 Measurement environment (long corridor). Figure 11.32 shows the average value of the block error rate (BLER) for 10s at each point according to the distance from the BTS in each MCS. From 10 to 25 m away from the BTS, the BLER remains 0 in most of the MCS except Rank-8 of 64-QAM R = 0.8. MCS is sensitive to the position of the UE and spatial correlation affects when 10-20 m away from the BTS. Figure 11.33 shows the CDF of the downlink throughput 25 m away from the BTS in Rank-8 of 64-QAM R = 0.8 keeping the same position for 20 S. More than 9.6 Gbps in the downlink was achieved at the 25 m point, which is the peak through- out this trial. Rank-8 transmission can be realized provided the environment does not 11 Measurements Distance [m] Rank 8 64QAM R = 0.8 Rank 8 64QAM R = 0.5 Rank 8 16QAM R = 0.5 Rank 8 QPSK R = 0.5 Rank 1 64QAM R = 0.8 Rank 1 64QAM R = 0.5 Figure 11.32 Distance VS. BLER. Figure 11.33 CDF of downlink throughput at 25 m from BTS (Rank-8 of 64-QAM R = 0.8). Downlink throughput (Gbps) depend on the distance from th