rol (PARC) and an MMSE detector for multistream trans- mission. Single-stream transmission with antenna selection and maximum ratio combining is used otherwise. For feedback, each terminal computes the effective SINR for all transmission modes prior to demodulation. A quantized version of the SINR is considered as a regular transmission packet and fed back over the physical uplink shared channel (PUSCH) to the base station. The resulting feedback rate is 9.6 kb/s. Frequency-dependent multiuser scheduling is implemented on a longer time scale. In our implementation, SINR feedback is updated every 10 ms for every RF. Frequency-dependent scheduling allows us to exploit the resources in a broad- band OFDMA system by allocating RBs to users with better spectral efficiency. The scheduling algorithm assigns resources in time, frequency, and space domains according to a scheduling policy. The result is a resource grant map for each radio frame. The grant map contains information about the targeted user, the MCS, and the spatial mode used on each RB. The implemented scheduling policy is an opportunistic proportional fair scheduler according to Viswanath, Tse, and Laroia [14], which additionally incorporates a fairness utility function for the scheduler input. © 2009 by Taylor & Francis Group, LLC Long Term Evolution: 3 GPP LTE Radio and Cellular Technology 11.3.2 Multiuser Measurement For the measurements, we deployed a multiuser MIMO scenario with one BS and two UEs. There was no interference from other BSs. Measurements were conducted in indoor office and outdoor scenarios. The indoor scenario consisted of a typical rectangular office room of size 20 m X 8 m X 3 m. The room contained typical office furniture (e.g., chairs, tables, and computers). The room had three doors at each side and a window front on the fourth side. The BS was located in the corner of the room. Both UEs were moved along predefined routes through the room, using a constant velocity of approximately 1 m/s. All antennas were cross-polarized. The outd