New challenges in over-the-air testing

On Radiated Performance Evaluation of Massive MIMO Devices in Multiprobe Anechoic Chamber OTA Setups

“…They conclude that the coherent wave field synthesis is the only potential MPAC method fulfilling the criteria. We agree with [23] that with the pre-faded synthesis the reconstruction of wave fronts from arbitrary directions is not possible. However, in order to support for coherent wave field synthesis a very high number of probes and emulator resources would be required [18].…”

“…In the literature MPAC OTA techniques for massive MIMO or mm-wave device evaluations have been discussed in [18]- [23]. In the following we summarize the work briefly.…”

“…Finally, [23] specifies selection criteria for the OTA method for testing of 5G equipment and discusses different alternatives. The identified criteria are: capability for real-time performance assessment, for emulating realistic radio channels, and for bidirectional (up-and downlink) emulation.…”

Recent advances on OTA testing for 5G antenna systems in multi-probe anechoic chamber setups

“…Different channel emulation algorithms have been discussed for 5G antenna OTA testing. In [9], it was concluded that the PWS technique would require a very high number of probes and emulator resources for electrically large DUT, and hence might not be suitable. As for the PFS technique, several strategies were discussed in the literature to reduce system cost, e.g.…”

“…Therefore, it is not suitable for testing adaptive antenna systems and the system cost increase significantly if antenna count on the 5G systems is massive. The MPAC method is technically sound for 5G antenna system performance testing, where propagation environments can be physically emulated in the test area [5][6][7][8][9][10][11][12][13]. It is expected that the MPAC setup has the great potential for OTA testing of 5G antenna systems.…”