es frequency selective, similar to the classical power delay profile known from channel modeling. By con- trolling the delays and attenuators in the cables, the frequency selectiveness of the channel can be easily controlled without modifying the chamber. Depending on the loading of a chamber and whether it is equipped with some absorbing material, the different pickup antennas might even be used to control the angular spread of the signal. Note that the number of these pickup antennas used needs to be sufficiently large in order not to limit the rank of the channel between the two chambers. In the described two-chamber setup, a complete transceiver, from digital algo- rithm to antennas, can be optimized and the performance of different setups can be evaluated using, for example, link throughput or BER as an optimization criteria. The measurements will be independent of the transceiver implementation. This allows us to characterize systems with, for example, integrated antenna and LNA designs, which are difficult to measure in current setups. Of particular interest in link-level measurements in the LTE context are mea- surements with channel state information at the transmitter that can be used for link adaptation. In this case, the performance of power allocation on the OFDM or MIMO subchannels created through precoding, adaptive coding, and modulation can be evaluated. In contrast to other measurement environments, such as those created in drive tests, the performance of MIMO systems using spatial multiplex- ing can be investigated in a repeatable environment. 12.4.2 Single-Cell System-Level Measurements Although the link-level tests discussed in the previous section allow for design- ing antennas and for optimizing transceiver designs, these measurements say little about the performance of the overall system. The link-level measurements, however, can be taken a step further towards system-level measurements by using multiple terminals in the chamber in conjunction with one base station connected to the chamber